What is the softest mineral in the world?
Other definitions (questions) for the word “talc” (128)
- Weightlifter’s powder
- Hydrous magnesium silicate
- Silicate mineral
- Main component of baby powder
- What does a weightlifter rub in his hands before an exercise?
- Mineral for powder
- Baby powder base
- Hand powder
- White mineral used in powder form in medicine.
- Baby powder
- Baby powder
- Diaper rash powder
- Light soft layered mineral (used in perfumery, rubber industry)
- Baby powder
- Type of mineral belonging to “Amphibole (silicates)”
- m. fossil of various types, clayey, shale, earthy, fatty, soapy; is part of many fossils; rub tight boots with talc powder; talc clay is used for felting
- Soft mineral
- Baby powder
- Contains powder
- Powder
- Powder base
- Technical powder for weightlifter’s hands
- Baby powder
- Traditional element of baby powder
- Powder compact filler
- Mineral with minimal hardness
- Light-colored soft layered mineral used in technology and medicine
- Baby powder from the pharmacy
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- Mineral powder
- Baby powder that both gymnasts and weightlifters need
- Mineral powder
- Powder for cackling people
- Powder for cackling animals
- Powder in rubber glove
- Baby powder
- What prevents wax from sticking to the skin during hair removal?
- Perfume and cosmetic filler
- Light-colored soft layered mineral used in technology and medicine
- Powder for babies
- A greasy white powder that is the main ingredient in baby powders.
- technical weightlifter’s hand powder
- Light soft layered mineral used in technology and medicine
- Powder, powder
- “Powder” on the hands of a weightlifter
- Baby powder
- Powder for baby’s bottoms
- Powder for toddlers
- Powder for babies
- Baby powder
- Mineral, electrical insulating material
- Michael Faraday mineral
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- Powder for weightlifters
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- Powder in medicine
- A soft, white mineral, usually used in powder form in technology and medicine.
- Powder for athletic arms
- Layered soft mineral of white color, usually used in powder form in technology and medicine.
- Powder for diapers
- Powder in the tire
- Athletic powder
- Technical cousin of powder
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- Powder on baby’s bottom
- Powder for little butts
- Powder for toddler
- Weightlifter’s Powder
- Powder on baby’s bottom
- Powder in medicine, hydrous magnesium silicate
- Rubber products are poured into them
- Powder on the palms of a weightlifter
- What type of mineral is steatite?
- Powder for baby’s bottoms
- Mineral used as powder
- This mineral ranks first on the Mohs scale.
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- Powder for the hands of gymnasts and weightlifters
- Mineral, standard of softness
- Powder for toddlers
- Mineral for powder
- Mineral at the service of cosmetologists
- What do athletes powder before lifting a barbell?
- Mohs scale
- Mineral used to make powder
- Mineral, filler in the perfumery, cosmetics, paper, rubber and technical industries
- A mineral that scores 1 on the Mohs hardness scale.
- Light soft layered mineral
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- Powder that helps the gymnast not to slip on the bars
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- Powdered surgical gloves
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- Powder for weightlifters
- Diaper rash powder
- It’s not what weightlifters and gymnasts rub their hands on before performing.
- Mineral in powder base
- Gymnastic powder
- Powder in rubber gloves
- Powder on the butt
- Powder for babies
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- perfume-cosmetic filler
- Powder for wet butts
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- Powder on a tourniquet
- Baby powder
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- Magnesium silicate
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- miner (mineralogy) mineral of the subclass of layered silicates, hydrous magnesium silicate Mg3[And4О10] (HE)2, soft crystalline greasy to the touch, easily converted into fine powder, a white or greenish substance used in ceramics (including radio and electrical ceramics), chemical, paper, rubber, paint and varnish (mainly as an inert filler), cable, metallurgical, medical, perfume and other industries ◆ Soft and fatty minerals (talc, graphite) are used as fillers, to lubricate rubbing parts of mechanisms, etc. A. G. Betekhtin, “Course of Mineralogy”, 1951
Meaning of the word
TALC, -A, Muzhkoy road
A layered soft mineral of white or greenish color (usually used in technology and medicine in powder form). Talc deposits. Ground talc. Sprinkling with talcum powder.
Talc (magnesium tetrasilicate composition Mg 3 Si 4 O 10 (OH) 2 >> ) is a mineral from the silicate class, a subclass of layered silicates. A crystalline substance that is a greasy, crumbly powder of white (occasionally green) color.
The quality of talc is determined by its whiteness. For industrial purposes, ground talc, microtalc, etc. are used.
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Talc is the softest mineral on earth, so it can be scratched with your fingernails. It is a clay mineral composed of hydrated magnesium silicate, which often represents the illusion of olivine, amphibole, tremolite, enstatite and other minerals. . The solid soapstone variety is known as soapstone, and the impure solid variety is called soapstone.
Properties of talc
- Chemical formula of talc: Mg 3 Si 4 O 10 (OH) 2
- Talc hardness: 1 on the Mohs scale.
- Talc color. Talc minerals are colorless, white, green, brown or gray. Talc powders come in white or gray colors.
- Transparency: translucent.
- Talc shine : glassy and pearly.
- Morphology. Ehedral crystals are extremely rare, usually occurring as lamellar, layered to fine-grained compact masses, sometimes with a radial appearance.
- Specific gravity: 2.58 – 2.83 Feet
- Impurities: Ni, Fe, Al, Ca, Na, H 2 O.
- Benefits. Talc leaves a soapy and greasy feeling. It has water-repellent properties, chemical inertness and affinity for organic substances.
How is talc formed?
Talc is formed through long-term physical and chemical changes in other minerals underground. It belongs to the “metamorphic mineral” variety. The formation of talc occurs in different geological environments and is always combined with carbonates and chlorite.
Based on the parent rock from which talc deposits originate, four types can be distinguished:
Extraction from magnesium minerals
Magnesia minerals such as serpentine, pyroxene, amphibole and olivine can form talc carbonate rocks in the presence of carbon dioxide and water. Among them, serpentine deposits provide about 20% of the world’s talc. The crude ore is grey, but flotation separation can be used to improve the whiteness.
Preparation from magnesium carbonates
When magnesium carbonate rocks such as magnesite and dolomite are altered at high temperatures, talc is formed. More than half of the world’s talc comes from this type of talc deposit. The color of talc is usually pure and white.
Preparation from aluminosilicate rocks
About 10% of the world’s talc comes from these deposits. Sometimes they occur in combination with magnesium carbonate deposits. The crude ore is gray in color due to the presence of chlorite, but no upgrading is required as chlorite is useful for industrial applications.
Extraction of magnesium from sedimentary deposits
Talc is formed by the direct transformation of magnesium clays such as askerolite, sepiolite or stevensite. Currently, deposits belonging to this category are not being developed.
Who produces talc?
China is the world’s major talc producer, accounting for 30% of global talc production (2018). Other major producers are India, Brazil, USA, South Korea, France, Japan and Finland. High purity talc, which has high industrial value, is mainly sourced from China, India and Pakistan.
Notable economic talc deposits include Mount Seabrook in Western Australia. Luzenac Group is the world’s largest supplier of mined talc. Its largest talc mine at Trimouns near Luzenac in southern France produces 400 tonnes of talc per year.
Talc uses
Talc is a vital part of everyday life and is also one of the most important industrial minerals. Most people use products containing talc every day , but they do not realize that talc is present in the product or what special role it plays.
After 40 years of research and clinical evidence, Talcum powder is safe and does not cause cancer. As for the ingredients of talc, it is a hydrous magnesium silicate consisting of magnesium, silicon, oxygen and hydrogen.
| No. | Talc applications | Talc products |
| 1 | Talc in plastic | Fillers and crystal nucleators for automobiles (dashboards, interior and exterior bumper trim), household appliances and polypropylene food packaging. |
| 2 | Talc in papers | Fillers, resin control agents and coatings. |
| 3 | Talc in paints | Filler pigments (viscosity and gloss adjustment) and powder paints. |
| 4 | Talc in electronic components | Laminate, ink and adhesive resistant moldings. |
| 5 | Talc in ceramics | Ceramic glaze and honeycomb ceramic material. |
| 6 | Talc in rubber | Fillers and non-stick agents for tires, pharmaceutical plugs, cables, etc. |
| 7 | Talc in makeup | Baby powder, soap，antiperspirants; cosmetics (blush, foundation, eye shadow and lipstick). |
| 8 | Talc in medicine | Additives to medical lubricants, tablets and bleaching agents. |
| 9 | Talc in food | Additives to marmalade and chewing gum; chewing gum base fillers; food preservatives and foaming agents. |
| 10 | Talc in agriculture | Anti-caking agents, dispersants and lubricants for dies for animal feed, fertilizer and pesticide carriers. |
| 11 | Talc in wastewater treatment | Mineral additives for wastewater treatment plants. It can achieve high quality discharge and zero bacteria loss without harming the environment. |
How is talc mined and processed?
Talc often contains dolomite, calcite, quartz, magnesite, serpentine, siderite, pyrite, chlorite and other minerals. To increase its purity, special attention should be paid to the extraction and processing of talc.
Talc extraction
When developing talc mines using open pit methods Large excavators are used to increase the production rate, which can ensure an adequate supply of raw materials. Workers pinpoint the direction of the talc veins through careful prospecting, which can ensure the extraction of high-quality talc ore.
Pre-selection by car ,talc blocks, talc fine particles and talc slag are separated and classified into different qualities.
Talc processing
Extracted talc can be purified dry or wet. The dry manufacturing process is used for high-grade talc deposits, while the wet manufacturing process is used for low-grade talc deposits.
Currently the industry Mainly uses dry production process to produce ultra-fine talc powder and rarely uses the wet manufacturing process.
1. Dry talc production process
• Hand-selected purified talc
- Principle: According to the difference in smoothness of talc and gangue, manual selection is carried out to purify talc minerals.
- Purpose: Pre-separate massive associated minerals.
- Features: This method is widely used because talc is easily identified by touching it. The higher the talc content, the better the smoothness. However, this requires workers to have experience. It is gradually being replaced by color selection.
• Color selection and purification of talc.
- Principle. Using talc’s property of emitting white fluorescence under ultraviolet light, purer talc can be sorted using a color sorter.
- Opportunities. This method is now increasingly appreciated and used in enterprises.
- Example. The American Cyprus Talc Company used this method to beneficiate low-grade ore containing 30% talc to high-grade ore containing 69% talc and finally grind it to 200 mesh for flotation. to obtain 99% cosmetic talc.
• Electrical selection and purification of talc
- Principle: Depending on the difference in conductivity between talc, magnesite, magnetite and other particles of empty minerals, electrical selection is carried out in a high-voltage electric field.
- Purpose: remove talc impurities such as magnesite, magnetite, pyrite or tremolite.
- Features: This method can be used for coarse talc rock separation as well as beneficiation and tailings removal.
• Magnetic separation and purification of talc
- Principle. According to the magnetic difference between talc and related minerals, magnetic separation uses a magnetic separator to purify talc.
- Purpose: remove iron-containing minerals and improve the whiteness of talc.
- Features: Using the proper magnetic separation method and equipment can reduce the iron content of talc powder from 4% to 5% to less than 1%.
2. Wet talc production process
• Flotation separation and purification of talc
- Principle. Talc can be purified by flotation separation because the surface of talc is hydrophobic and the minerals associated with it are hydrophilic.
- Process: (1) first crush and grind the talc to separate the talc from the bound minerals; (2) Then put the talc into a ball mill for wet grinding. 90% -95% of talc has a particle size of less than 0.074 mm and is sent to the flotation separator; (3) Add flotation agents to convert the talc into a suspension at a concentration of approximately 15-20%. Talc concentrate is obtained by flotation separation.
- Flotation reagents: collector (eg kerosene), frother (flotation oil No. 2 and methyl isobutyl carbinol), activator (eg sulfuric acid), inhibitor (usually lime), regulator (sulfuric acid and Lime).
- Features: This method is relatively simple. Most talc mines require only one roughing, one refining and 2-4 times beneficiation to produce the final concentrate.
• Cleaning and cleaning with talcum powder
- Principle: adding an acid or some substance to water using the difference in water solubility and rate of precipitation of talc and associated minerals to separate the talc from the associated minerals.
- Process . The process is completed with the help of a cleaning machine and a hydrocyclone. It mainly includes grinding, refining, precipitation, thickening and drying.
- Features: This method is simple but has a low recovery rate of talc. Due to the slight difference in specific gravity between talc and associated minerals, talc is likely to be sorted as associated minerals.
Fine and ultrafine grinding of talc
Finally, talc is used in powder form, so the purified talc must be crushed and ground. Talc has a Mohs hardness of 1 and is easy to grind and grinds well. It is usually crushed by jaw crusher and hammer crusher, and then crushed by Raymond mill and ultra-fine mill.
Processing of talc powder:
- 1 Coarse grinding: First, the talc ore is uniformly sent to the jaw crusher through the vibrating feeder for coarse grinding;
- 2 Drying: then the crushed ore is sent to the dryer through the bucket elevator for dying;
- 3 Further crushing: After drying, the talc ore is sent to the hammer crusher for medium and fine crushing;
- 4 Grinding: The talc ore is then sent to the Raymond Mill and Ultrafine Mill for fine and ultrafine grinding to produce final talc powders.
- 5 Classification. Finally, the talc powders are classified using a spiral classifier. Qualified talc powders are packaged as final product and the rest are sent to the milling machine for re-grinding.
Through the above talc processing and standardized working methods, the production process of each link is strictly controlled to produce high quality talc with good whiteness and fineness.
Author : Jordan Jordan is a blog writer with extensive knowledge of the industry. Most importantly, he sincerely hopes to help you in your projects.
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