A brief introduction to the manufacture of light calcium carbonate
1) carbonation method: materials such as limestone calcined lime (ingredient for calcium oxide) and carbon dioxide, then add water to digest lime to generate lime milk (ingredient for calcium hydroxide), and then pass into the carbon dioxide carbide lime milk calcium carbonate precipitation, the calcium carbonate precipitation by dehydration, drying and crushing system of light calcium carbonate.
2) pure alkali (Na2CO3) calcium chloride: add calcium chloride to a pure alkaline aqueous solution, and the calcium carbonate deposits can be made.
3) causation: in the process of producing caustic soda (NaOH), it can be obtained by the byproduct light calcium carbonate. Add lime hydrate in soda ash aqueous calcium carbonate can generate precipitation, and get the caustic soda solution at the same time, the precipitation of calcium carbonate by dehydration, drying and crushing system of light calcium carbonate.
4) the Solvay method: in the process of producing pure alkali, it can be obtained by the byproduct light calcium carbonate. The saturated salt water is carbonized by carbon dioxide after inhalation of ammonia, and it is precipitated by a heavy base (sodium bicarbonate) and ammonium chloride solution. The manufacturing process of light calcium carbonate is divided into the following steps: 1. Limestone calcinates 2. Calcium carbonate digestion 3. Lime water carbonation 4. Precipitation, filtration 5. Dry, crushed.