Dolomite Powder Manufacturer



WHAT IS IT?




It is a naturally occurring mineral CaMg(CO3)2.

MOLECULAR STRUCTURE




Dolomite structure is formed by an ionic interaction of Mg2+ (magnesium cation), Ca2+ (calcium cation), and CO32- (carbonate anion). For every two carbonate anions there is one magnesium cation and one calcium cation, thereby making the structure electrically neutral. A common pattern of arrangement of ions is shown:

PROPERTIES




1.Tactile properties: It is slightly rough and abrasive.

2.Visual properties:

  • Color: It is often in pink or pinkish and can be colorless, white, yellow, gray or even brown or black when iron is present in the crystal white, grey, pink color.
  • Lustre: It is vitreous to pearly to dull.
  • Streak: It is white.
  • Diaphaneity: It is opaque.
3.Structural properties:

  • Hardness: 3.5-4 mohs.
  • Specific gravity: 2.84-2.86.
4.Affinity to water: It has the ability to adsorb and absorb moisture. However, its solubility in pure water is poor though it readily disperses in water.





5.Affinity to oil: It has low oil absorption capacity.

6.Heat properties:

  • Thermal conductivity: 5.1 W m-1 K-1 at 20 °C, It exhibits a two stage decomposition (750 ° Dolomite and MgO; 900 ° CaO and MgO).
  • Specific heat capacity: 900 J kg-1 K-1 at 20 °C.
  • Mean thermal expansion coefficient: 4.1×10-6/°C.
  • Melting Point: 2570 °C.
7.Electric properties: It is poor conductor of electricity.

8.Combustion properties: It is non explosive and non-inflammable.

9.Chemical properties: It’s effervesces is weak with warm acid or when first powdered, with cold HCl.




APPLICATIONS




Theoretically, dolomite contains 54.35% CaCO3 and 45.65% MgCO3. Its composition can also be expressed in terms of the oxides. Thus, in other words, it contains 30.4% CaO, 21.7% MgO and 47.9% CO2.


However, in nature considerable variations arise in dolomite due to the following factors:

  • Varying proportions of lime and magnesia.
  • Presence of impurities, chiefly silica, alumina and iron oxide.
  • Differences in geological formations.

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