According to preliminary statistics in the industry, from the end of last century to the beginning of this century, the domestic annual production capacity of precipitated calcium carbonate has reached more than 8 million tons. Under the guidance of industry associations, domestic manufacturers have continuously popularized the calcium carbonate production process technology, continuously improved the production process level, and popularized the large-scale and high-efficiency technology. Manufacturers compete in product variety, quality, production capacity and cost. With the orderly development of the industry and mutual learning and promotion of enterprises, the production technology of light calcium carbonate continues to develop. The wide exchange of production technology and various types of talents has led to the rapid development of light calcium carbonate production.
Calcium carbonate has been deeply developed and applied in chemical industry, medicine, building materials, papermaking and other industries, and has become an important inorganic chemical raw material in the national economy.
The production of precipitated calcium carbonate is mostly produced by carbonization after lime digestion. The principle is the same, but the process is diverse, and the effects are obviously different. The carbonized water mixture is filtered to form a wet filter material with different water content. The wet filter material must be dried to remove water in order to produce qualified calcium carbonate products.
Drying is usually realized by heating semi-finished materials with hot coal to evaporate water, which is a process of consuming heat energy.
In the cost of calcium carbonate, the energy consumption cost accounts for more than 80% of the total cost, while the energy consumption cost of wet filter material drying accounts for more than 40% of the total cost. Therefore, the drying cost directly affects the product cost. The main way to reduce drying energy consumption and cost is to improve the process control technology level of drying equipment while improving the capacity of drying equipment and stabilize drying conditions.
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