Method of producing magnesium hydroxide and light magnesium oxide using magnesite as raw material

Abstract

A process for preparing magnesium hydroxide and light magnesium oxide from magnesite includes such steps as calcining the magnesite in carbonizing kiln to obtain magnesium oxide, preparing magnesium oxide slurry, carbonizing to become magnesium carbonate, acidolyzing to become soluble magnesium hydroxide, adding oxidant to the mixed acid solution for oxidizing the ferrous elements to become iron hydroxide, filtering for removing it, adding soluble magnesium hydroxide and ammonium salt solution, thermodecomposing to generate magnesium hydroxide, press filtering, and light burning or baking.

Description

Technical field: [0001] The invention relates to magnesium compounds, in particular to a method for producing magnesium hydroxide and light magnesium oxide by using magnesite minerals as raw materials. Background technique: [0002] At present, there are very few magnesite resources in my country, and magnesite has the highest magnesium content among all magnesium-containing ores, but the magnesium salt products produced since the mine were opened are low-quality magnesia and magnesium oxide; The magnesite ore required by magnesia and magnesium oxide must have a magnesium content of more than 47% to meet the requirements. About 70% of the magnesite in the mining area cannot be developed and utilized because of the low magnesium content. The disadvantages are low resource utilization rate and poor product quality, resulting in the waste of a lot of resources and high development costs. At present, there are two methods of producing light magnesium carbonate and light magnesiu...

AI Technical Summary

Problems solved by technology

So far, no magnesium compound can be produced by using traditional carbonization method using magnesite ore as raw material, and the traditional acid hydrolysis method cannot penetrate the acid solution, resulting in too low magnesium yield and waste of resources