What is the production process of heavy calcium carbonate?
The production process of heavy calcium carbonate:
1. Heavy calcium state
White powder, colorless and odorless. Stable in air. Almost insoluble in water and insoluble in alcohol. If it is dilute acetic acid and dilute nitric acid, it will foam and dissolve. When heated to 898℃, it begins to decompose into calcium oxide and carbon dioxide.
Heavy calcium carbonate has irregular shape, large particle size variation, certain angularity of particles, rough surface, wide particle size distribution, large particle size, and average particle size is generally 1~10μm. Heavy calcium carbonate is divided into coarse ground calcium carbonate (>3) according to its original average particle size (d) μm. Fine ground calcium carbonate (1~3) μm). Ultrafine calcium carbonate (0.5~1) μm Characteristics of heavy calcium carbonate: A. Irregular particle shape; b. Wide particle size distribution; c. Large particle size.
2. Production method of heavy calcium carbonate
There are two production processes for heavy calcium carbonate:
1. Dry production process: artificial selection of calcite, limestone, chalk, shells, etc. transported from the quarry, removing coal gangue; then, the limestone is coarsely crushed by the crusher, and then fine limestone powder is obtained by Raymond (pendulum) grinding. The ground powder is graded by a classifier. Powder that meets the particle size requirements is stored as a product package, otherwise it is returned to the crusher for re-crushing.
2. Wet production process: First, the suspension made of dry powder is put into the mill for further crushing, and then dehydrated and dried to prepare ultrafine heavy calcium carbonate.