Magnesite carbonization method for producing magnesium hydroxide and calcium carbonate product

Abstract

The invention discloses a magnesite carbonization method for producing magnesium hydroxide and a calcium carbonate product, and belongs to the technical field of inorganic chemical industry. The method comprises the following steps of: calcining and grinding magnesite, mixing with water, adding CaCl2 into pulp, introducing CO2 gas, and stirring and filtering to obtain a primary filter cake and primary filtrate; adding alkali into the filtrate, and stirring and filtering to obtain a secondary filter cake and secondary filtrate; performing spray drying on the secondary filter cake to obtain Mg(OH)2; drying the secondary filtrate to obtain NaCl; adding water into the primary filter cake, introducing CO2 gas, and stirring and filtering to obtain a third filter cake and third filtrate; performing spray drying on the third filtrate to obtain CaCO3; and filtering and drying the third filter cake to obtain a product serving as a raw material for producing glass for subsequent treatment. The CaCl2 is added in the carbonization reaction process, the carbonization efficiency is improved, high-purity magnesium hydroxide and calcium carbonate products are prepared, other useful components serve as raw materials for producing glass and is subsequently treated and utilized, the production process flow is simple, the equipment requirement is low, and after the treatment, other pollution is not generated.

Description

technical field [0001] The invention relates to a process method for comprehensive utilization of magnesite, in particular to a method for producing magnesium hydroxide and co-producing calcium carbonate products through carbonization of magnesite. Background technique [0002] my country's magnesite resources are abundant and of good quality, with a reserve of 3 billion tons, accounting for one-third of the world's reserves and ranking first. The unique advantages of mineral resources make my country the world's largest producer and exporter of magnesia materials. However, the following main problems still exist in the process of developing and utilizing magnesium ore resources: the use of magnesium ore resources is too extensive, and the utilization efficiency of resources is seriously low; due to the small scale of most magnesium and magnesium salt industries, the low level of technology and equipment, most of them use Low value-added products with low technical content ...

AI Technical Summary

Problems solved by technology

However, the following main problems still exist in the process of developing and utilizing magnesium ore resources: the use of magnesium ore resources is too extensive, and the utilization efficiency of resources is seriously low; due to the small scale of most magnesium and magnesium salt industries, the low level of technology and equipment, most of them use Low value-added products with low technical content are the main products, and the advantages of mineral resources have not been fully utilized, and the development mode of exchanging survival at the cost of resources and the environment has not yet been shaken off; fine magnesium salt products cannot meet the needs of domestic and foreign markets in terms of quantity and quality , still needs to be imported, seriously affecting the economic benefits of magnesium salt enterprises

Because the property of magnesium bicarbonate solution is unstable, it is very easy to decompose in aqueous solution, this invention does not adopt other methods to improve the solubility of magnesium bicarbonate, so that the concentration of magnesium bicarbonate solution obtained by carbonization is small, and the carbonization efficiency is low

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