Silver Stone Industries

Dolomite Powder

Industrial Mineral Fillers for Paint Plastic Polymer Industry

Dolomite Powder is the limestone powder with composition of CaCO3 and MgCO3 pertaining to 100% in combination, the proportion being varied as per mining zone. Dolomite mineral is a double carbonate of calcium and magnesium and it exhibits a granular structure. There are two types of materials often called dolomite, a true chemically uniform calcium magnesium carbonate with the chemical formula CaMg(CO3)2 , and a dolomitic limestone, which is just an irregular mixture of calcium and magnesium carbonates. Dolomite is believed to have formed by replacement of some of the calcium in a calcium carbonate limestone deposit with magnesium, while the sediment was undergoing lithification, being converted from layers of dead clam and other sea animal shells into crystallized calcite or calcium carbonate. The resultant Dolomite mineral, CaMg(CO3)2 is a true double salt.

The calcium and magnesium ions in dolomite exist in separate layers in the crystal matrix. Dolomite has a calcium layer, then a carbonate layer, then a magnesium layer then a carbonate layer, and so on. Dolomite is harder and denser than the calcite form of Calcium Carbonate or Limestone, and is more chemically inert and more impervious to acid attack. The inherent differences between dolomite and calcite drive the applications for dolomite. Dolomite is chosen for many construction and building product applications due to its increased hardness and density. Asphalt and concrete applications prefer dolomite as filler for its higher strength and hardness. Dolomite also finds use in a number of applications as a source of magnesium such as glass and ceramics manufacture, as well as a sintering agent in iron ore pelletization and as a flux agent in steel making. Farmers use dolomite for agricultural pH control. The chemical industry uses the mineral dolomite in making magnesium salts including magnesia, magnesium oxide (MgO), which is used in pharmaceuticals.

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Physical Properties:

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95 ~ 97%
97 ~ 99%
Specific Gravity
0.10 % Max
Bulk Density
0.80 ~ 1.20 (Depending on the Particle Size)
Oil Absorption
19 ~ 23 (Depending on the Particle Size)
40 ~ 43%
Total Carbonates
90 ~ 94%

Chemical Properties:

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26 ~ 28%
17 ~ 19%
47 ~ 50%
35 ~ 38%
0.10 ~ 0.25%
10 ~ 12%

Particle Size:

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30 ~ 10 μ
7 ~ 3 μ