Talc                 
          
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 Information at a glance

General
  • Talc (derived from the Persian via Arabic talq) is a mineral composed of hydrated magnesium silicate with the chemical formula H2Mg3(SiO3)4 or Mg3Si4O10(OH)2.
  • It is the widely used substance known as talcum powder, It occurs as foliated to fibrous masses, its monoclinic crystals being so rare as to be almost unknown.
  • It has a perfect basal cleavage, and the folia are non-elastic, although slightly flexible.
  • It has a specific gravity of 2.5–2.8, a clear or dusty luster, and is translucent to opaque, Its color ranges from white to grey or green and it has a distinctly greasy feel. Its streak is white.

Process

  • Talc ore generally is hauled to the plant by truck from a nearby mine.

  • The ore is crushed, typically in a jaw crusher, and screened, The coarse (oversize) material then is returned to the crusher.

  •  Rotary dryers may be used to dry the material. Secondary grinding is achieved with pebble mills or roller mills, producing a product that is 44 to 149 micrometers ( m) (325 to 100 mesh) in size.

  •  Some roller mills are designed to use heated air to dry the material as it is being ground.

  •  Hammer mills or steam- or compressed air powered jet mills may be used to produce additional final products.

Market

  • The term ‘talc’ refers to both mineral talc and industrial products that contain mineral talc in proportions that range from about 35% to almost 100% and are marketed under the name talc.

  • Mineral talc occurs naturally in many regions of the world where metamorphosed mafic and ultramafic rocks or magnesium carbonates occur.

  • Mineral talc is usually platy but may also occur as asbestiform fibres.

  • Together with platy talc, asbestiform talc is found in the Gouverneur District of New York State, USA, and occasionally elsewhere; it may be associated with other minerals as observed by transmission electron microscopy. 

Application

  • Talc's confer 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  also enhance matting.

  • Talc' s are used in both uncoated and coated rotogravure papers where they improve printability as well as reducing surface friction, giving substantial improvements in productivity at the paper mill and print house.

  • They also improve mattness and reduce ink scuff in offset papers, Used as pitch control agents.

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