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[Chemical Knowledge]：Production method and process of calcium carbonate

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The manufacturing method
of calcium carbonate
1. Introduction

calcium carbonate is a widely used chemical production raw material, which has excellent physical and chemical properties, such as high whiteness, high purity, low oil, low oil absorption and so on. Therefore, calcium carbonate is widely used in many fields, such as plastics, rubber, coatings, paper, printing ink, ceramics, medicine, food and so on. This article will introduce the manufacturing method of calcium carbonate in detail.

2. Manufacturing Methods

1. Precipitation

precipitation method is the main method for the production of calcium carbonate. Its principle is to add alkaline absorbent to a solution containing calcium ions to react with calcium ions in the solution to generate calcium carbonate precipitation. The specific steps are as follows:

(1) preparation of calcium salt solution: limestone or dolomite ore containing calcium element is calcined into calcium oxide, and then water is added to digest to generate calcium hydroxide, and then carbon dioxide gas is introduced to generate heavy calcium carbonate precipitation and calcium bicarbonate solution.

(2) purification treatment: purification treatment of calcium bicarbonate solution to remove impurity ions and organic matter.

(3) carbonation reaction: carbon dioxide gas is introduced into the purified calcium bicarbonate solution to react with calcium ions in the solution to generate calcium carbonate precipitate.

(4) Separation and drying: The calcium carbonate precipitate is separated from the mother liquor, and then washed and dried to obtain the finished product calcium carbonate.

2. decomposition method

decomposition method is by heating the carbonate ore to decompose to generate calcium oxide and carbon dioxide, and then carbon dioxide into the water to generate calcium bicarbonate solution, and then add alkaline absorbent to generate calcium carbonate precipitation. The specific steps are as follows:

(1) Calcination of carbonate ore: Carbonate ore such as limestone or dolomite is calcined to 900-1100 ° C. to decompose it to generate calcium oxide and carbon dioxide.

(2) digestion and carbonization: the calcined calcium oxide is digested with water to generate calcium hydroxide, and then carbon dioxide gas is introduced to generate calcium bicarbonate solution.

(3) Precipitated calcium carbonate: an alkaline absorbent is added to the calcium bicarbonate solution to react with calcium ions in the solution to generate calcium carbonate precipitate.

(4) Separation and drying: The calcium carbonate precipitate is separated from the mother liquor, and then washed and dried to obtain the finished product calcium carbonate.

3. Influencing Factors

The manufacturing process of calcium carbonate is affected by many factors, such as the quality of raw materials, reaction temperature, reaction time, pH value, stirring speed, etc. These factors will affect the particle size distribution, whiteness, purity and other properties of calcium carbonate. Therefore, these factors need to be strictly controlled in the production process to ensure product quality.

4. conclusion

calcium carbonate is an important raw material for chemical production, and its manufacturing methods mainly include precipitation method and decomposition method. In the production process, various influencing factors need to be strictly controlled to ensure product quality. At the same time, with the continuous development of science and technology, the manufacturing methods and processes of calcium carbonate also need to be continuously improved and optimized to improve production efficiency and product performance to meet the changing market demand.

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