What is Calcium Carbonate ?
Calcium carbonate, or CaCO3, comprises more than 4% of the earth’s crust and is found ...
ACB MINERALS JOINT STOCK COMPANY
History:
We are ACBM leading company specializes in producing & exporting Calcium carbonate powder in Vietnam. Established in 2011 ,Investment License No 2901900698 by Nghe An Department of Planning and Investment.
We have been exporting to many countries with good reputation. With the rich and quality material resource in Nghe An, and the modern manufacturing system imported from Germany. We can satisfy a variety of customer’s demand. Moreover, we have good relationship with many domestic shipping companies which can offer cheapest charges. For those reasons, ACBM always supplies customers high quality products, competitive price, best service and on-time delivery.
Major business line of the company is processing Calcium Carbonate (CaCO3), including Ground Calcium Carbonate powder( GCC) and Precipitated Calcium Carbonate powder (PCC). D97 sizing from 5 micrometer, D50 sizing from 0.8micro metter upwards, which to being additives/ materials for the making paper, paint, plastic, rubber, cosmetics, poultry feeding and the like.
We have built up ACBM’s reputation as well as achieved clients’ belief in major markets such as Bangladesh, India, Pakistan… We believe that we could bring you satisfaction with our products and services
Our philosophy is: Bring satisfaction and benefits to customers.
Vission:
- To become one of the best supplier Calcium Carbonate powder in the world
Mission:
- Employees: Be a good place to work where people are inspired to be the best they can be
- Partners: Be a reliable, successful, great company which all partners are wish to cooperate with and create mutual, enduring value together
- Community: Be enterprise which emplement fully social responsibilities all times
- The quality of goods is higher and higher, while the price is more competitive;
- Build up a large winning network with partners, together we make value;
- Increase number of business transaction, rise turnover and maximize profit.
Strategic Goals
- Continue to benchmark and develop programs to achieve best practices in health, safety, and the environment;
- Create a positive public awareness of industrial minerals;
- Promote an environment conducive to competition in the global marketplace;
- Broaden representation to other key industrial minerals.
CHARACTERISTICS
USES
Natural, Untra-fine Calcium Carbonate Powder,
manufactured from very high purity limestone by
HOSOKAWA-ALPINE from Germany
Paint, Paper, Plastic (PVC cable,
pipe, compound), Rubber (tyre,
tubes, belt), EVA sheet, Foam,
Ceramic, Detergent, Adhesives &
Sealants, Artificial leather. etc.,
CHEMICAL ANALYSIS OF THE RAW MATERIAL
COMPOUND
Calcium Carbonate – CaCO3
Iron Oxide – Fe2O3
Magnesium – MgO
Silica – SiO2
Aluminium Oxide – Al2O3
VALUE
> 98% min
0.015% max
0.02% max
0.03% max
0.02% max
PHISICAL PROPERTIES OF RAW MATERIAL
Specific Gravity
Hardness
Loss on Ignition
2.7g/cm3
3 Moh
43.80% min
TECHNICAL DATA OF THE PRODUCED MATERIAL
Moisture
PH Value
DOP oil Absorption
Whiteness(WHITENESS ANALYSER
MINOLTA CR400/CR410 – JAPAN)
Brightness
Bulk Density
0.2% max
8-9
24g/100g CaCO3 max
97% Min
97% Min
0.42g/cm3
FINENESS (PARTICLE LASER DIFRACTION MALVERN – ENGLAND)
D50 (Particle Size)
D97 (Top cut)
Mesh size
1.8 ± 0.5 Micron (µm)
8 ± 1 Micron (µm)
1875 Mesh
ORIGIN:
Vietnam
PACKING:
25kgs in PP Woven Bag with LLDPE Liner
CHARACTERISTICS
USES
Natural, Untra-fine Calcium Carbonate Powder,
manufactured from very high purity limestone by
HOSOKAWA-ALPINE from Germany
Paint, Paper, Plastic (PVC cable,
pipe, compound), Rubber (tyre,
tubes, belt), EVA sheet, Foam,
Ceramic, Detergent, Adhesives &
Sealants, Artificial leather. etc.,
CHEMICAL ANALYSIS OF THE RAW MATERIAL
COMPOUND
Calcium Carbonate – CaCO3
Iron Oxide – Fe2O3
Magnesium – MgO
Silica – SiO2
Aluminium Oxide – Al2O3
VALUE
> 98% min
0.015% max
0.02% max
0.03% max
0.02% max
PHISICAL PROPERTIES OF RAW MATERIAL
Specific Gravity
Hardness
Loss on Ignition
2.7g/cm3
3 Moh
43.80% min
TECHNICAL DATA OF THE PRODUCED MATERIAL
Moisture
PH Value
DOP oil Absorption
Whiteness(WHITENESS ANALYSER
MINOLTA CR400/CR410 – JAPAN)
Brightness
Bulk Density
0.2% max
8-9
24g/100g CaCO3 max
97% Min
97% Min
0.44g/cm3
FINENESS (PARTICLE LASER DIFRACTION MALVERN – ENGLAND)
D50 (Particle Size)
D97 (Top cut)
Mesh size
1.8 ± 0.5 Micron (µm)
10 ± 1 Micron (µm)
1500 Mesh
ORIGIN:
Vietnam
PACKING:
25kgs in PP Woven Bag with LLDPE Liner
CHARACTERISTICS
USES
Natural, Untra-fine Calcium Carbonate Powder,
manufactured from very high purity limestone by
HOSOKAWA-ALPINE from Germany
Paint, Paper, Plastic (PVC cable,
pipe, compound), Rubber (tyre,
tubes, belt), EVA sheet, Foam,
Ceramic, Detergent, Adhesives &
Sealants, Artificial leather. etc.,
CHEMICAL ANALYSIS OF THE RAW MATERIAL
COMPOUND
Calcium Carbonate – CaCO3
Iron Oxide – Fe2O3
Magnesium – MgO
Silica – SiO2
Aluminium Oxide – Al2O3
VALUE
> 98% min
0.015% max
0.02% max
0.03% max
0.02% max
PHISICAL PROPERTIES OF RAW MATERIAL
Specific Gravity
Hardness
Loss on Ignition
2.7g/cm3
3 Moh
43.80% min
TECHNICAL DATA OF THE PRODUCED MATERIAL
Moisture
PH Value
DOP oil Absorption
Whiteness(WHITENESS ANALYSER
MINOLTA CR400/CR410 – JAPAN)
Brightness
Bulk Density
0.2% max
8-9
24g/100g CaCO3 max
97% Min
97% Min
0.53g/cm3
FINENESS (PARTICLE LASER DIFRACTION MALVERN – ENGLAND)
D50 (Particle Size)
D97 (Top cut)
Mesh size
2.5 ± 0.5 Micron (µm)
15 ± 1 Micron (µm)
1000 Mesh
ORIGIN:
Vietnam
PACKING:
25kgs in PP Woven Bag with LLDPE Liner
CHARACTERISTICS
USES
Natural, Untra-fine Calcium Carbonate Powder,
manufactured from very high purity limestone by
HOSOKAWA-ALPINE from Germany
Paint, Paper, Plastic (PVC cable,
pipe, compound), Rubber (tyre,
tubes, belt), EVA sheet, Foam,
Ceramic, Detergent, Adhesives &
Sealants, Artificial leather. etc.,
CHEMICAL ANALYSIS OF THE RAW MATERIAL
COMPOUND
Calcium Carbonate – CaCO3
Iron Oxide – Fe2O3
Magnesium – MgO
Silica – SiO2
Aluminium Oxide – Al2O3
VALUE
> 98% min
0.015% max
0.02% max
0.03% max
0.02% max
PHISICAL PROPERTIES OF RAW MATERIAL
Specific Gravity
Hardness
Loss on Ignition
2.7g/cm3
3 Moh
43.80% min
TECHNICAL DATA OF THE PRODUCED MATERIAL
Moisture
PH Value
DOP oil Absorption
Whiteness(WHITENESS ANALYSER
MINOLTA CR400/CR410 – JAPAN)
Brightness
Bulk Density
0.2% max
8-9
24g/100g CaCO3 max
97% Min
97% Min
0.53g/cm3
FINENESS (PARTICLE LASER DIFRACTION MALVERN – ENGLAND)
D50 (Particle Size)
D97 (Top cut)
Mesh size
3.8 ± 0.5 Micron (µm)
20 ± 1 Micron (µm)
750 Mesh
ORIGIN:
Vietnam
PACKING:
25kgs in PP Woven Bag with LLDPE Liner
CHARACTERISTICS
USES
Natural, Untra-fine Calcium Carbonate Powder,
manufactured from very high purity limestone by
HOSOKAWA-ALPINE from Germany
Paint, Paper, Plastic (PVC cable,
pipe, compound), Rubber (tyre,
tubes, belt), EVA sheet, Foam,
Ceramic, Detergent, Adhesives &
Sealants, Artificial leather. etc.,
CHEMICAL ANALYSIS OF THE RAW MATERIAL
COMPOUND
Calcium Carbonate – CaCO3
Iron Oxide – Fe2O3
Magnesium – MgO
Silica – SiO2
Aluminium Oxide – Al2O3
VALUE
> 98% min
0.015% max
0.02% max
0.03% max
0.02% max
PHISICAL PROPERTIES OF RAW MATERIAL
Specific Gravity
Hardness
Loss on Ignition
2.7g/cm3
3 Moh
43.80% min
TECHNICAL DATA OF THE PRODUCED MATERIAL
Moisture
PH Value
DOP oil Absorption
Whiteness(WHITENESS ANALYSER
MINOLTA CR400/CR410 – JAPAN)
Brightness
Bulk Density
0.2% max
8-9
24g/100g CaCO3 max
97% Min
97% Min
0.55g/cm3
FINENESS (PARTICLE LASER DIFRACTION MALVERN – ENGLAND)
D97 (Top cut)
Mesh size
4.5 ± 0.5 Micron (µm)
25 ± 2 Micron (µm)
600 Mesh
ORIGIN:
Vietnam
PACKING:
25kgs in PP Woven Bag with LLDPE Liner
CHARACTERISTICS
USES
Natural, Untra-fine Calcium Carbonate Powder,
manufactured from very high purity limestone by
HOSOKAWA-ALPINE from Germany
Paint, Paper, Plastic (PVC cable,
pipe, compound), Rubber (tyre,
tubes, belt), EVA sheet, Foam,
Ceramic, Detergent, Adhesives &
Sealants, Artificial leather. etc.,
CHEMICAL ANALYSIS OF THE RAW MATERIAL
COMPOUND
Calcium Carbonate – CaCO3
Iron Oxide – Fe2O3
Magnesium – MgO
Silica – SiO2
Aluminium Oxide – Al2O3
VALUE
> 98% min
0.015% max
0.02% max
0.03% max
0.02% max
PHISICAL PROPERTIES OF RAW MATERIAL
Specific Gravity
Hardness
Loss on Ignition
2.7g/cm3
3 Moh
43.80% min
TECHNICAL DATA OF THE PRODUCED MATERIAL
Moisture
PH Value
DOP oil Absorption
Whiteness(WHITENESS ANALYSER
MINOLTA CR400/CR410 – JAPAN)
Brightness
Bulk Density
0.2% max
8-9
24g/100g CaCO3 max
94% Min
93% Min
0.61g/cm3
FINENESS (PARTICLE LASER DIFRACTION MALVERN – ENGLAND)
D50 (Particle Size)
D97 (Top cut)
Mesh size
12 ± 2 Micron (µm)
35 ± 5 Micron (µm)
425-500 Mesh
ORIGIN:
Vietnam
PACKING:
25kgs in PP Woven Bag with LLDPE Liner
TECHICAL DATA SHEET
| CHEMICAL ANALYSIS OF THE RAW MATERIAL | |
| COMPOUND | VALUE |
| Calcium Carbonate - CaCO3 | >98% min |
| Iron Oxide - Fe2O3 | 0.015% max |
| Magnesium - MgO | 0.02% max |
| Silica - SiO2 | 0.03% max |
| Aluminium Oxide - Al2O3 | 0.02% max |
| PHISICAL PROPERTIESOFRAWMATERIAL | |
| SpecificGravity | 2.7g/cm3 |
| Hardness | 3 Moh |
| LossonIgnition | 43.80% min |
| TECHNICAL DATAOFTHEPRODUCEDMATERIAL | |
| Moisture | 0.2% max |
| PHValue | 8-9 |
| DOPoil Absorption | 24g/100g CaCO3 max |
| Whiteness(WHITENESSANALYSER | 96.5% Min |
| MINOLTACR400/CR410-JAPAN) | |
| Brightness | 96.5% Min |
| Size | |
| Size | 1 mm |
| ORIGIN: | |
| Vietnam | |
| PACKING: | |
| 1.35 Mt per jumbo bag, Loose 27 Mts in container 20 feet | |
TECHICAL DATA SHEET
| CHARACTERISTISC | USER |
| Natural Limestone Chips 2-3mm | Poultry feed |
| CHEMICAL COMPOMENT | |
| COMPOUND | VALUE |
| Calcium - Ca | ≥ 38% |
| Calcium Carbonate - CaCO3 | ≥96% |
| Calcium Oxide - CaO | ≥54.60% |
| Iron Oxide - Fe2O3 | ≤0.04% |
| Magnesium - MgO | ≤0.91% |
| Silica - SiO2 | ≤0.23% |
| Aluminium Oxide - Al2O3 | ≤0.15% |
| Potassium Oxide - K2O | ≤0.05% |
| Sodium Oxide - Na2O | Nil |
| Titanium Oxide - TiO2 | Nil |
| CUO | Nil |
| PBO | Nil |
| PHISICAL CHARACTERISTICS | |
| Dry Brightness | ≥ 90% |
| Whiteness | ≥ 90% |
| Endosmosis | ~ 23g Alcohol |
| Humidity | ≤0.3% |
| Content loss on ignition | ≤43,8% |
| ORIGIN: | |
| Vietnam | |
| PACKING: | |
| 50kgs in PP Woven Bag with LLDPE Liner | |
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Calcium carbonate, or CaCO3, comprises more than 4% of the earth’s crust and is found throughout the world. Its most common natural forms are chalk, limestone, and marble, produced by the sedimentation of the shells of small fossilized snails, shellfish, and coral over millions of years. Although all three forms are identical in chemical terms, they differ in many other respects, including purity, whiteness, thickness and homogeneity. Calcium carbonate is one of the most useful and versatile materials known to man.Many of us encounter calcium carbonate for the first time in the school classroom, where we use blackboard chalk. Chalk has been used as a writing tool for over 10,000 years and is a fine, microcrystalline material. As limestone, calcium carbonate is a biogenic rock, and is more compacted than chalk. As marble, calcium carbonate is a coarse-crystalline, metamorphic rock, which is formed when chalk or limestone is recrystallised under conditions of high temperature and pressure. Large deposits of marble are found in North America and in Europe; e.g., in Carrara, Italy, the home of the pure white “statuario” from which Michelangelo created his sculptures.Calcium carbonate, as it is used for industrial purposes, is extracted by mining or quarrying. Pure calcium carbonate can be produced from marble, or it can be prepared by passing carbon dioxide into a solution of calcium hydroxide. In the later case calcium carbonate is derived from the mixture, forming a grade of product called “precipitated calcium carbonate,” or PCC. PCC has a very fine and controlled particle size, on the order of 2 microns in diameter, particularly useful in production of paper. The other primary type of industrial product is “ground calcium carbonate,” or GCC. GCC, as the name implies, involves crushing and processing limestone to create a powdery-like form graded by size and other properties for many different industrial and pharmaceutical applications.A study of calcium carbonate provides important lessons about the history of the earth, since chalk, limestone and marble trace their origin to shallow water. Thus, observation that large amounts of chalk deposits of the same age are found on many continents led to the discovery that there existed a period in which there was shallow water world-wide where shelled organisms thrived. Some offer this as proof for the Biblical flood. Nature returns the favor as calcium carbonate solutions from current deposits provide living organisms today with the material they need to grow their protective shells and skeletons. Eggshells, for example, are composed of approximately 95% calcium carbonate.Calcium carbonate causes a unique reaction with acids. Upon contact with an acid – no matter the strength – it produces carbon dioxide. This provides geologists with a reliable test to identify calcium carbonate. This same phenomenon is important to the formation of caves. Acidic rain water runs off and goes underground where it dissolves the calcium carbonate limestone. The calcium carbonate water runs down and eventually reaches an air-filled cavity underground where the carbon dioxide can be released. When it is released, the calcium carbonate crystallizes again. Stalactite and stalagmite formations are created when water containing calcium carbonate drips, leaving some mineral at the source of the drip at the roof of the cave and some where it falls. This is an extremely long process, and often takes place over many thousands of years.As interesting as calcium carbonate may be in nature, its impact and value to our everyday life are truly extraordinary.Paper, Plastics, Paints, and Coatings: Calcium carbonate is the most widely used mineral in the paper, plastics, paints and coatings industries both as a filler – and due to its special white color – as a coating pigment. In the paper industry it is valued worldwide for its high brightness and light scattering characteristics, and is used as an inexpensive filler to make bright opaque paper. Filler is used at the wet-end of paper making machines, and calcium carbonate filler allows for the paper to be bright and smooth. As an extender, calcium carbonate can represent as much as 30% by weight in paints. Calcium carbonate also is used widely as a filler in adhesives, and sealants.Personal Health and Food Production: Calcium carbonate is used widely as an effective dietary calcium supplement, antacid, phosphate binder, or base material for medicinal tablets. It also is found on many grocery store shelves in products such as baking powder, toothpaste, dry-mix dessert mixes, dough, and wine. Calcium carbonate is the active ingredient in agricultural lime, and is used in animal feed. Calcium carbonate also benefits the environment through water and waste treatment.Building Materials and Construction: Calcium carbonate is critical to the construction industry, both as a building material in its own right (e.g. marble), and as an ingredient of cement. It contributes to the making of mortar used in bonding bricks, concrete blocks, stones, roofing shingles, rubber compounds, and tiles. Calcium carbonate decomposes to form carbon dioxide and lime, an important material in making steel, glass, and paper. Because of its antacid properties, calcium carbonate is used in industrial settings to neutralize acidic conditions in both soil and water.Calcium carbonate crystals are referred to as calcite. The calcite crystal generally is considered a rhombohedron because of its cleavage properties. Cleavage is what causes crystals to angle where the bonding forces are weak and are apt to break into planes. Calcite is unique in that its cleavage takes three distinct directions. There are more than 300 forms of calcite crystals. Calcite crystals also come in many different colors, but usually are white or transparent. Another important property of the calcite crystal is its property of double refraction. Double refraction occurs when a ray of light travels through a medium and is split into two different beams, one traveling slowly, one traveling fast. The two different beams are bent at two different angles of refraction. As a result of this property a person looking through calcite sees two images. This property of double refraction is a feature valuable to a number of optical applications.
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→ View MoreWhat is Kaolin ?
Kaolin, or China clay, is nearly white in color. It is distinguished from other industrial ...
Kaolin, or China clay, is nearly white in color. It is distinguished from other industrial clays based on its fine particle size and pure coloring. Its ability to disperse in water make it an ideal pigment.The primary constituent in kaolin is the mineral kaolinite, a hydrous aluminum silicate formed by the decomposition of minerals such as feldspar.The name kaolin derives from the Chinese and means high ridge. High ridge is a reference to the hill in south-eastern China where the clay was originally discovered and used. In the 7th and 8th centuries, the Chinese were the first to use kaolin to make porcelain. It was not until centuries later that other areas of the world could duplicate the process.The white color of the mineral can either be naturally occurring, or can result after processing which removes minerals and other color-bearing compounds. The small particle size of the mineral contributes to its white color by scattering light.Although kaolin is found throughout the world, deposits with suitable whiteness, viscosity and other favorable characteristics are rare. Ironically, the best deposits are not located in China. The Unites States has high-quality deposits in the Southeast. The mineral has been mined since colonial times in Georgia and South Carolina. Other valuable deposits are located in Brazil and the United Kingdom.Paper Industry: The primary use of kaolin is in the paper industry. It serves as a paper coating which improves appearance by contributing to brightness, smoothness and gloss. It also improves printability. Additionally, it is used by the paper industry as a filler reducing cost and the use of tree-based resources.China, Porcelain and Tableware: Many people are under the mistaken impression that the only use for kaolin is in the manufacture of china. This is not true, and its use by the paper industry far exceeds its other uses. However, kaolin still serves as a valuable component in china and other tablewares. Its color, gloss and hardness are ideal characteristics for such products.Other Uses: Kaolin has a variety of other uses in products including paint, rubber, cable insulation, specialty films and fertilizers. New uses are being discovered frequently, and ensure that the mineral will remain in demand for a long time.
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→ View MoreWhat is Wollastonite ?
Wollastonite is a naturally occurring mineral with many unique characteristics. Through ...
Wollastonite is a naturally occurring mineral with many unique characteristics. Through advanced processing, it has become one of the most versatile functional fillers in the marketplace. Wollastonite increases the performance of many products including plastics, paints and coatings, construction materials, friction, ceramic and metallurgical applications to name a few.Wollastonite is an industrial mineral comprised chemically of calcium, silicon and oxygen. Its molecular formula is CaSiO3 and its theoretical composition consists of 48.28% CaO and 51.72% SiO2. Natural wollastonite may contain trace or minor amounts of various metal ions such as aluminum, iron, magnesium, potassium and sodium. Wollastonite is rarely found by itself and generally contains other minerals like calcite, garnet and diopside that are removed during processing.Optimum performance is created by properly matching the correct coupling agent at the right concentration level to the polymer system. Overall, the benefits of a surface modified wollastonite are improved physical properties, improved processing along with improved dispersion of the resin.Plastics: In plastics, wollastonite improves the durability of the composite due to its acicular or needle-like structure. It also enhances electrical insulating properties, adds fire resistance, and improves dimensional stability. Finer particle size grades provide improved scratch and impact resistance compared to other materials. The application of surface treatments like silanes on the wollastonite substrate changes the mineral from a utilitarian filler to a functional component of a polymer composite. This in turn adds performance values which the base resin alone does not possess. Optimum performance is created by properly matching the correct coupling agent at the right concentration level to the polymer system. Overall, the benefits of a surface modified wollastonite are improved physical properties, improved processing along with improved dispersion of the resin.Construction: Wollastonite has found application as a substitute for asbestos in fire-resistant building products used in the construction industry. As a functional additive, wollastonite improves flexural and impact strengths. Its low thermal conductivity and high aspect ratio structure also makes wollastonite an attractive addition for applications requiring fire resistance. Wollastonite finds application in interior and exterior construction boards, roof tiles, shaped insulation products, sheets, panels and sidings.Paints and Coatings: In coatings, fine acicular particles act as a good flattening agent and allow paint to settle out after application to produce a dry film of uniform thickness, and the interlocking particles improve toughness and durability of the coating with excellent tint retention, scrub, and weather resistance. High brightness and whiteness reduce pigment load and typically very low oil absorption, reduces the volume of binder required and contributes to reduced pigment costs. As noted earlier, wollastonite can also act as a pH buffer for improved in-can paint stability over long periods of time. The acicular structure and alkaline nature of wollastonite also make it an ideal auxiliary pigment in industrial coatings and primers for improved corrosion resistance.Ceramics: Wollastonite can be used in a variety of ceramic applications including ceramic glazes and bodies, enamels, frits, fluxes and in sanitary-ware. This industrial mineral is a source of CaO to alkaline glaze formulations to improve the strength of the glaze. Wollastonite also has a low LOI (< 1%) which gives minimal gas evolution during firing resulting in a smooth surface with diminished pinholing. Due to its acicular structure, wollastonite improves green strength and reduces crazing and checking especially during rapid heating and cooling. It has a low sintering temperature (approximately 991-1196°C) which is comparable to that of most natural frits.Metallurgical: In metallurgical applications, wollastonite is used due to its low water solubility, low loss on ignition and its Ca–Si ratio. Wollastonite is commonly added to formulated powders for steel casting and welding. A CaO/SiO2 ratio of 1 readily absorbs Al2O3 that is detrimental to finished steels. The addition of wollastonite to metallurgical fluxes provides ready fusibility, good insulating qualities and low viscosity. Because wollastonite is a natural, low temperature flux, it has found acceptance in fluxing formulations used in the continuous casting of steel. When molten steel is poured continuously from a ladle or tundish, a casting powder is applied to maintain surface defects, prevents oxidation of the steel, lubricates the mold wall and absorbs harmful inclusions.Friction: Due to its physical structure and non-hazardous properties, wollastonite is used as a reinforcing additive in many friction applications. It is also a partial/full replacement for asbestos, milled fibres, chopped glass and synthetic materials. Its primary application is in semi-metallic and nonasbestos formulations for truck blocks, drum linings, disc pads and friction paper. Benefits of using wollastonite in a friction formulation include improved physical and mechanical properties, reduction or elimination of cracking, improved pre-form strength, improved friction stability, noise reduction and reduced raw material and unit cost (density). -
→ View MoreWhat is Talc ?
Talc is the world’s softest mineral. Although all talc ores are soft, platy, water ...
Talc is the world’s softest mineral. Although all talc ores are soft, platy, water repellent and chemically inert, no two talcs are quite the same. Talc is a vital part of everyday life. The magazines we read, the polymers in our cars and houses, the paints we use and the tiles we walk on are just some of the products that talc enhances.Talc is a hydrated magnesium sheet silicate with the chemical formula Mg3Si4O10(OH)2. The elementary sheet is composed of a layer of magnesium-oxygen/hydroxyl octahedra, sandwiched between two layers of siliconoxygen tetrahedra. The main or basal surfaces of this elementary sheet do not contain hydroxyl groups or active ions, which explains talc’s hydrophobicity and inertness.Talc is practically insoluble in water and in weak acids and alkalis. It is neither explosive nor flammable. Although it has very little chemical reactivity, talc does have a marked affinity for certain organic chemicals, i.e. it is organophilic. Above 900°C, talc progressively loses its hydroxyl groups and above 1050°C, it re-crystallizes into different forms of enstatite (anhydrous magnesium silicate). Talc’s melting point is at 1500°C.MorphologyThe size of an individual talc platelet (= a few thousand elementary sheets) can vary from approximately 1 micron to over 100 microns depending on the deposit. It is this individual platelet size that determines a talc’s platyness or lamellarity. A highly lamellar talc has large individual platelets whereas a microcrystalline talc’s platelets are much smaller. The elementary sheets are stacked on top of one another, like flaky pastry, and, because the binding forces (known as Van der Waal’s forces) linking one elementary sheet to its neighbors are very weak, the platelets slide apart at the slightest touch, giving talc its characteristic softness.Related MineralsTalc ores also differ according to their mineralogical composition (i.e. the type and proportion of associated minerals present). They can be divided into two main types of deposits: talc-chlorite and talc-carbonate. Talc-chlorite ore bodies consist mainly of talc (sometimes 100%) and chlorite, which is hydrated magnesium and aluminium silicate. Chlorite is lamellar, soft and organophilic like talc. It is however more hydrophylic. Talc-carbonate ore bodies are mainly composed of talc carbonate and traces of chlorite. Carbonate is typically magnesite (magnesium carbonate) or dolomite (magnesium and calcium carbonate). Talc – carbonate ores are processed to removed associated minerals and to produce pure talc concentrate.Talc’s properties (platyness, softness, hydro-phobicity, organophilicity, inertness and mineralogical composition) provide specific functions in many industries.Agriculture and Food: Talc is an effective anti-caking agent, dispersing agent and die lubricant and therefore helps animal feed and fertilizer plants to function more efficiently. In premixes and agricultural chemicals, it makes an ideal inert carrier.Talc also is used as an anti-stick coating agent in a number of popular foods including chewing gum, boiled sweets, cured meats, and for rice polishing. In olive oil production, as a processing aid, it increases yield and improves the clarity of the oil.Ceramics: Talc is a phyllosilicate which imparts a wide range of functions to floor and wall tiles and sanitaryware, tableware, refractories and technical ceramics. In traditional building ceramics (tiles and sanitaryware), it is used essentially as a flux, enabling firing temperatures and cycles to be reduced.In refractory applications, chlorite-rich talc is transformed into cordierite to improve thermal shock resistance. For steatite ceramics, talcs with a microcrystalline are the most appropriate. During firing, the talc is transformed into enstatite, which possesses electro-insulating properties. As for very low iron content talcs, they are particularly suitable for use in frit, engobe and glaze compositions.Coatings: Talc confers a whole range of benefits to coatings. In interior and exterior decorative paints, they act as extenders to improve hiding power and titanium dioxide efficiency. Talc’s lamellar platelets make paint easier to apply and improve cracking resistance and sagging. They also enhance matting. In anti-corrosion primers, talc is used to improve corrosion resistance and paint adhesion. Talc also brings benefits to inks, jointing compounds, putties and adhesives.Paper: Talc is used in both uncoated and coated rotogravure papers where it improves printability as well as reducing surface friction, giving substantial improvements in productivity at the paper mill and print house. It also improves mattness and reduce ink scuff in offset papers. Used as pitch control agents, talc “cleans” the paper making process by adsorbing any sticky resinous particles in the pulp onto their platy surfaces, thereby preventing the agglomeration and deposition of these on the felts and calenders. As opposed to chemical pitch-control products that pollute the process water, talc is removed together with the pulp, enabling the papermaker to operate more easily in closed-circuit. In specialty papers such as colored papers or labels, talc helps to improve quality and productivity.Personal Care: As it is soft to the touch and inert, talc has been valued for centuries as a body powder. Today it also plays an important role in many cosmetic products, providing the silkiness in blushes, powder compacts and eye shadows, the transparency of foundations and the sheen of beauty creams. In pharmaceuticals, talc is an ideal excipient, used as a glidant, lubricant and diluent. Soap manufacturers also use talc to enhance skin care performance.Plastics: Talc imparts a variety of benefits to polypropylene, for instance higher stiffness and improved dimensional stability. In automotive parts (under-the-hood, dashboard, bumper interiors and exterior trim), household appliances and white goods. It requires advanced milling technology to obtain the finest talc without diminishing the reinforcing power of its lamellar structure. Talc also is used for linear low density polyethylene (LLDPE) antiblocking and as a nucleating agent in semicrystalline polymers. In polypropylene food packaging applications, talc is a highly effective reinforcing filler.Rubber: Talc reduces the viscosity of rubber compounds, thereby facilitating the processing of moulded parts. It also improves extrudate qualities, increasing production rates and enhancing UV radiation resistance of exterior parts such as automotive profiles. In sealants and gaskets, they provide good compression resistance, while in pharmaceutical stoppers, they create a barrier against liquids. In cables, talc functions as insulators and in tire manufacture it makes excellent processing aids.Wastewater treatment: Specialty talc can improve the performance of biological wastewater treatment plants. The talc particles ballast the flocs of bacteria and accelerate their sedimentation. The addition of talc results in top quality discharge and zero bacterial loss. It can help to upgrade plants without resorting to costly plant expansions. As opposed to most chemicals used to clean wastewater, such as chlorine or aluminium salts, talc is a natural, environmentally-friendly mineral additive. And because it is inert, it preserves the fertilizing value of sewage sludge.
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