What are the commonly used heavy calcium powder raw materials? What is the difference in the preparation of heavy calcium?
Heavy calcium carbonate is ground from natural carbonate minerals such as calcite, marble, and limestone, also known as ground calcium carbonate, and is a commonly used powdery inorganic filler. So, what is the difference between the heavy calcium powder processed with calcite, marble and limestone?
1. Calcite VS Marble VS Limestone Raw Material Composition Comparison
The chemical formula of calcite is CaCO3, and its theoretical chemical composition is: CaO 56.03%, CO2 43.97%, belonging to the trigonal crystal system, colorless or white, sometimes dyed by iron, manganese, copper and other elements into light yellow, light red, purple, brown etc.
Natural marble, also known as marble, is recrystallized limestone, the main component is CaCO3. Limestone softens under high temperature and pressure and recrystallizes to form marble as the minerals it contains change. The main components are calcium and dolomite, with many colors, usually with obvious patterns, and many mineral particles. The Mohs hardness is between 3 and 5, and it is generally cubic.
The main chemical component of limestone is CaCO3, which is in the form of calcite particles, with complex crystal morphology, often in triangular and rhombohedron, light gray or bluish gray , Mohs hardness 3~4, density 2.5~2.8g/cm3.
The main components of the three are CaCO3. In contrast, the calcium content of calcite is slightly higher than that of marble and limestone, and the calcium content of good calcite can reach more than 99%. Therefore, not ordinary limestone and marble can be used as the raw material of heavy calcium powder, and it should be noted that limestone with high calcium content can be used as heavy calcium.
2. Comparison of processing technology
01. Generally not mechanical mineral processing of calcite in industry, only simple ore washing and hand selection; for limestone, only simple washing is generally required, and no complex beneficiation process is required for purification; in contrast, marble Rich in color and variety, mineral processing is more complicated than calcite and limestone.
02. The Mohs hardness of calcite is 3, which is lower than that of marble and limestone. Therefore, with the same power crushing equipment, the efficiency of processing calcite is higher than that of marble and limestone.
03. The superfine grinding process of calcite mainly includes dry method and wet method. Dry process is generally used to produce products with d97≥3~5μm, wet process is generally used to produce products with d97≤3~5μm (d90≤2μm); limestone generally adopts dry crushing process.
SMMVIK can provide a complete set of crushing and grinding processing equipment and solutions, including MTW European version mill, TGM super-pressure trapezoidal mill, Raymond mill, vertical mill, ultra-fine vertical mill, ultra-fine powder Grinding and other heavy calcium powder processing equipment can process heavy calcium powder with different fineness such as 200 mesh, 325 mesh, 400 mesh, 800 mesh, 1250 mesh, etc., which can meet the application needs of different fields.