Method for producing high-purity magnesium oxide by using light calcined powder as raw material

Abstract

A method for producing high-purity magnesium oxide by using light calcined powder as a raw material relates to a production method of magnesium oxide; ammonia gas and ammonia distilled liquid are obtained by the raw material of light calcined powder and an ammonium acetate solution through an ammonia distillation process; the ammonia distilled liquid is filtered to remove solids so as to obtain magnesium salt refined liquid; a magnesium precipitation reaction is performed by the refined liquid and the ammonia gas released in the ammonia distillation process to obtain magnesium hydroxide mother liquor; the magnesium hydroxide mother liquor is filtered to separate magnesium hydroxide filter residues and an ammonium acetate filtrate, and the filter residues are dried to obtain magnesium hydroxide; the dried magnesium hydroxide is calcined with a raw material additive to obtain the high-purity magnesium oxide product whose purity, whiteness, granularity, and bulk density meet requirements. The method produces high-purity magnesium oxide by using light calcined powder as a raw material, realizes ammonia (ammonium) circulation; not only the ammonia distillation time is shortened to less than 1 hour, but also the Mg2+ concentration of the magnesium salt liquid obtained after ammonia distillation is increased to above 2.5 mol / L; production energy consumption per unit product is reduced by 30-50%; the production cost is reduced and the economic benefit is improved.

Description

technical field [0001] The invention relates to a production method of magnesia, in particular to a method for producing high-purity magnesia by using lightly burned powder as a raw material. Background technique [0002] High-purity magnesia generally refers to magnesia products whose magnesia content is not less than 98% and the content of various impurity components is not higher than the specified value. High-purity magnesium oxide is a fine chemical product, used in high-end industrial fields such as aerospace, electrical and electronics, and also widely used in the production of paints, adhesives and other products. It is also an important raw material for the production of silicon steel in the metallurgical industry. [0003] Light calcined powder is a product whose main component is magnesium oxide obtained by calcining magnesite ore, and its magnesium oxide content is generally 80-93%. The preparation of high-purity magnesium oxide by using light-burned powder has ...

AI Technical Summary

Problems solved by technology

The technical route of this process is mature and the difficulty of industrialization is low. However, since the current technical process is to distill ammonia by mixing lightly burned powder with ammonium chloride, ammonium sulfate, or ammonium nitrate solution, the ammonia distillation process takes a long time, and the magnesium obtained after ammonia distillation The concentration of salt solution is low, so that the production process consumes a lot of energy and the economic benefit is not high

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