Talc is a hydrated magnesium silicate, 3mgo 4sio2 H2O formula and theoretical. The ideal composition in c.5 SiO2 1.7 MgO and 4.8% H2O containing. White, greenish transparent colors, slick, solid-looking and soft. According to the Mohs scale of hardness 1-1.5. varies between Density 2.6-2.8 g/cm3 between. Odnoklassniki Ru crystal shape. Thermal and electrical conductivity of talc is weak, but it is resistant to fire. Hardens when heated at high temperatures becomes. Acids will not be broken.
The talc shows no significant variation from the theoretical purity of the commercial ones usually. Such products, as talc is pure talc in the Black Sea and talc, dolomite, calcite, Quartz, diyopsit, coil, magnetic, pyrite, tremolite-actinolite, and Mica minerals such as in the case of a mixture in different proportions can be. The types of commercial talc include:
Steatite (Soapstone): the naming of mineral talc is the solid form containing. At least 50% of the mineral talc and contains electricity and resistant against acids, heat-resistant properties.
Steatite: talc is a term that is used for high purity massive. Is the construction of most electrical insulators. However, steatite %Fe2O3 and CaO less than 1.5 and less than 4% Al2O3 should contain.
Lava: from the block or block talc talc is used to refer to the final products.
Asbestos: a fibrous crystal of talc is rarely pure in the properties appearance. Rather, asbestos, sheet, film or mica are similar.
Rensselaer: the talc-like, but soft and non-greasy is a mineral.
French chalk: the massive variety of talc, used for making paint and pencils.
Regional or contact metamorphic talc deposits of dolomitic rocks of economic importance which is being, or may occur with serpantinlesme of igneous rocks. The formation of igneous rocks, with talc the most suitable areas for its sedimentary rock contacts, faults and shear are to. Contained within metamorphic schists and talc-schists may also be important.
PHYSICAL PROPERTIES OF THE TALC
Color: Yesil, Gray and silver near White.
Brightness: frosted or fat, such as is directed towards.
Transparency: crystals, Semi-Transparent, Opaque mass.
Crystal System: Monoclinic. ( 2/m.)
Crystal Behavior: Usually talc is found in compact or sheets in the form of the mass. Quartz, pyroxene, and amphibole crystals such as Alvin takes the form of fake.
Is divided in one direction are perfect.
Hardness: 1, respectively.
Specific gravity: 2.7-2.8. (Average)
Vascular: White.
Other features: thin air part is slightly bent, but it is not elastic. Tapping talc feels like soap.
Best features: softness, color, a sense of soap, brightness and divided.
Talc deposits can be divided mainly into 4 main groups:
1. Steatite-Compact Talk: Massive, cryptocrystalline, can be carved, or can be cut to the desired shape can be given. Steatite, 1800°F in 6 hours if heated turns into crystals klinoenstatit clamped (that is, it is called lava). This product has the property of good electrical insulator.
2. Soft Platy Talc: magnesium carbonate is a product of the metamorphism of sedimentary rocks. This is the type of talk the most important. Other talk to use more of the material properties.
3. Tremolite Talc: Sometimes it is called Hard talk. Tremolite in varying percentages, antofillit, calcite, dolomite, or Serpentine and talc is in the form of soft genuine massive green rock. % With Cao content ranging from 6-10 is characterized.
4. Mixed Talc Ores: Platy talc, dolomite, calcite, serpentine, talc and many other minerals known as Trace consisting of crisp and soft, white gets into shale rock. Talc-chlorite consisting of a mixture of low-quality beds are common.
Paint industry: talc fiber and featuring leaf and oil absorption characteristics due to such as paint and oil are used in making. When ground talc used in the paint industry, which is extremely white and tenor must be high (H .5). Also must be able to pass a 325 mesh screen. Tabakacik dock allows you to dye each other and talc fibers to the surface. Heavy paint of the paint prevents it from crashing and allows it to be more uniform materials.
In roof coating: talc is used for this job is usually of poor quality. So raw whiteness and purity is not required. Grain size and distribution and oil absorption properties required feature.
Against vermin: Talk hasare used in the production of Medicine are lethal. The toxic effect of drugs, the desired low density and abrasivity properties.
In the rubber industry: Talc, synthetic rubber, plastic, and rubber is used as filler in the production of. A tight texture gives the material.
In the paper industry: Talc, softness, grain size, characteristic and water absorbency due to the melting ink, paper industry, can be used freely. However, the talc to be used, the rate of CaCO3 2-5% other minerals and should not be more than should include.
In pharmacology and cosmetics: talc, since it is possible to obtain the desired grain size, chemical purity and lubricity due to the production of pharmaceuticals and cosmetic products are used. The required properties of talc which is used in this industry, and the lack of hard fibrous minerals that it contains, the amount of arsenic and iron is low.
Talk, for bringing stability to the molten asphalt in the construction of the roof and weather conditions provides high protection against fire. Talc also, the roof construction and prevents it from sticking to each other during placement of the gravel or roles.
Talk to them in the production of other animal feed, fertilizer in the production of sculpture in the coating industry, in soap making, used as electrical insulator in the Switch.
Production methods and technology
The production of talc in the world and in our country but carried out in both open and closed businesses in the form of high-quality talc deposits in the veins along the opening of the gallery was by it is well known that the production of talc. Blasting and excavation operations with traditional methods using raw materials extracted, the ore is subjected to a rough separation stoklanip piece it is sold as by our skilled workers. Or forward products talc (micronized micronized or Ultra) will need to obtain.
The processing of talc ore products in the world, advanced by the track obtaining
Tecnodieci Talc Thecnical Data :
%
SiO2.............60.50
MgO.............32.20
Fe2O3...........0.12
TiO2.............0.01
CaO..............0.11
Al2O3............0.50
MnO..............0.03
Na2O.............0.01
K2O...............0.01
P2O5.............0.02
L.0.I..............5-7 (1050 C )
Brightness (RY) DIN6174................93 % min.
Whitness L* DIN 6174....................97 % min.
Refractive Index...........................1.75
Moiture (wt.%)..............................0.4 max.
Hardness (Mohs)............................1.00
Bulk Density..................................2.7 Gr/m3
pH (ISO 787/9).............................8.5
Oil Absoption. (ISO 787/5)..............50 g/100 g
Surface Area (m2/g)......................1.45
Acid Solubility (wt% as CaO)...........
