Process for preparing crystal whisker calcium carbonate through combined production of high-purity magnesium hydrate and by-product

Abstract

The invention discloses a process for preparing crystal whisker calcium carbonate through combined production of high-purity magnesium hydrate and a by-product. The process for producing magnesium hydrate from a byproduct magnesium chloride solution generated in the production of potassium nitrate is combined with the process for producing crystal whisker calcium carbonate from byproduct calcium chloride generated in the production of magnesium hydrate; a mother liquor containing calcium chloride and magnesium chloride, obtained in the production of magnesium hydrate, is used to prepare crystal whisker calcium carbonate; produced magnesium carbonate is taken as an intermediate; the calcium carbonate crystal whisker is then promoted to grow through the conversion reaction; the high-quality calcium carbonate crystal whisker product is obtained; and magnesium chloride is recycled in the system but is not consumed, the process is simple, and the production cost is low.

Description

technical field [0001] The invention specifically relates to the technical field of chemical product production, in particular to a process for coproducing high-purity magnesium hydroxide and its by-products to prepare whisker calcium carbonate. Background technique [0002] In the existing process of producing magnesium hydroxide with the by-product magnesium chloride solution of the production of potassium nitrate, the prepared magnesium hydroxide is often not high in purity, and contains impurities such as iron, manganese and heavy metals, and the utilization rate of process raw materials is not high. The magnesium hydroxide product has low purity, many impurities, and uneven particle size, and the by-product calcium chloride obtained by production cannot be effectively utilized, resulting in a great waste of resources. Therefore, there is an urgent need for a method for producing potassium nitrate The co-production process that is matched with the process of producing ma...

AI Technical Summary

Problems solved by technology

[0002] In the existing process of producing magnesium hydroxide with the by-product magnesium chloride solution of the production of potassium nitrate, the prepared magnesium hydroxide is often not high in purity, and contains impurities such as iron, manganese and heavy metals, and the utilization rate of process raw materials is not high. The magnesium hydroxide product has low purity, many impurities, and uneven particle size, and the by-product calcium chloride obtained by production cannot be effectively utilized, resulting in a great waste of resources. Therefore, there is an urgent need for a method for producing potassium nitrate The co-production process that is matched with the production of magnesium hydroxide from the by-product magnesium chloride solution complements the production of magnesium hydroxide. The maximum efficiency of the existing resources is used to obtain the maximum yield and reduce the waste of raw materials.

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