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

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Manufacturing Methods

of Magnesium Chloride Magnesium chloride is an important inorganic chemical raw material, which is widely used in food, medicine, agriculture, chemical industry and other fields. In the field of chemical production of raw materials, magnesium chloride manufacturing methods are mainly the following:

1. acidolysis

acidolysis is a commonly used method of manufacturing magnesium chloride, mainly using hydrochloric acid or sulfuric acid and magnesium oxide or magnesium hydroxide reaction, magnesium chloride and water. The specific steps are as follows:

1. adding magnesium oxide or magnesium hydroxide into a reaction kettle;
2. adding hydrochloric acid or sulfuric acid to control the reaction temperature at 60-80 ° C.;
3. after the reaction, filtering, washing and drying to obtain magnesium chloride products. The advantages of

acidification method are simple process and convenient operation, but it will produce a large amount of acidic wastewater, which needs to be treated.

2. electrolysis method

electrolysis method is a more advanced method of manufacturing magnesium chloride, mainly through the electrolysis of molten magnesium chloride to obtain metal magnesium and chlorine, and then chlorine and metal magnesium reaction magnesium chloride. The specific steps are as follows:

1. heating and melting magnesium chloride;
2. electrifying electrolysis in an electrolytic cell to generate metal magnesium and chlorine gas;
3. reacting chlorine gas with metal magnesium to generate magnesium chloride. The advantages of

electrolysis method are high product quality and purity, but high energy consumption and high production cost.

3. metathesis

metathesis is a method of manufacturing magnesium chloride using metathesis reaction, mainly using double salt containing magnesium chloride to react with other compounds to generate magnesium chloride and another compound. The specific steps are as follows:

1. mixing the double salt containing magnesium chloride with other compounds according to a certain proportion;
2. reacting at a certain temperature to generate magnesium chloride and another compound;
3. filtering, washing and drying to obtain magnesium chloride product. The advantages of

double decomposition method are simple process and convenient operation, but it is necessary to find suitable double salt and reaction conditions.

The above are the three main manufacturing methods of magnesium chloride, each with its own advantages and disadvantages, and the appropriate method can be selected according to the actual situation. No matter which method is used, it is necessary to strictly control product quality and production costs, improve production efficiency, and provide high-quality raw materials for chemical production.

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