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[Chemical Knowledge]：Manufacturing method and process flow of magnesium carbonate

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The manufacturing method
of magnesium carbonate
1. overview

magnesium carbonate is an important inorganic chemicals, widely used in rubber, plastics, ceramics, glass, medicine, food and other fields. It has the characteristics of light weight, high whiteness and stable chemical properties, and can be used as filler, modifier and catalyst. This article will introduce the manufacturing methods of magnesium carbonate, including precipitation, hydrolysis, pyrolysis and so on.

2. precipitation method

precipitation method is one of the main methods for the production of magnesium carbonate, the principle is to add a precipitant to the solution containing magnesium ions, so that it reacts with magnesium ions to generate magnesium carbonate precipitate, and then the product is obtained by filtering, washing, drying and other processes. The specific steps are as follows:

1. configure magnesium salt solution: magnesium oxide or magnesium hydroxide and other magnesium salts are configured into a solution with a certain concentration.

2. Adding precipitant: adding precipitant to magnesium salt solution, such as sodium carbonate, sodium bicarbonate, etc., to react with magnesium ions to generate magnesium carbonate precipitate.

3. Filtration Washing: The magnesium carbonate precipitate formed was filtered off and washed with water.

4. Drying: The washed magnesium carbonate precipitate is dried to obtain the finished product.

3. Hydrolysis Method
The
hydrolysis method is a method in which magnesium hydroxide is produced by reacting metallic magnesium with water and then reacting it with carbon dioxide to produce magnesium carbonate. The specific steps are as follows:

1. adding metal magnesium into water, and reacting to generate magnesium hydroxide and hydrogen.

2. The resulting magnesium hydroxide is reacted with carbon dioxide to produce magnesium carbonate and water.

3. The produced magnesium carbonate was filtered, washed and dried to obtain a finished product.

4. Pyrolysis

Pyrolysis is a method in which a magnesium-containing compound is decomposed by heating to produce magnesium carbonate. The specific steps are as follows:

1. heating a magnesium-containing compound (such as magnesium oxide, magnesium hydroxide, etc.) to a certain temperature.

2. Decompose to produce magnesium carbonate and gas, and exhaust the gas.

3. The produced magnesium carbonate was cooled, filtered, washed and dried to obtain a finished product.

5. precautions

1. In the production process, the pH value, temperature, concentration and other parameters of the solution should be strictly controlled to ensure the quality and yield of the product.

2. Pay attention to control the temperature and time during the drying process to prevent the product from overheating or agglomeration.

3. Pay attention to environmental protection and safe production during the production process to avoid harm to the environment and personnel.

6. Conclusion There are many methods for the manufacture of

magnesium carbonate, including precipitation, hydrolysis, pyrolysis and so on. In the production process to strictly control the parameters to ensure product quality and yield. At the same time, attention should be paid to environmental protection and safe production to avoid harm to the environment and personnel.

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