Method for preparing high-purity magnesium oxide from titanium sponge byproduct fused magnesium chloride

Abstract

The invention relates to the technical field of comprehensive utilization of secondary resources, in particular relates to a method for preparing high-purity magnesium oxide from titanium sponge byproduct fused magnesium chloride. The method comprises the following steps: in the process of titanium sponge production, leading the fused magnesium chloride generated in a distillation process section and oxygen into an in-situ pyrolytic reaction device in a molar ratio of (1:0.5)-(1:10); and carrying out pyrolytic reaction for 1-60 minutes by utilizing waste heat of the fused magnesium chloride while stirring at the reaction temperature of 600-1000 DEG C so as to obtain a solid product containing magnesium oxide and a byproduct chlorine. In the in-situ pyrolytic reaction, oxygen bubbles are micronized and dispersed through stirring, thereby improving the efficiency of a gas-liquid reaction; based on the byproduct generated by titanium sponge as the raw material, the high-purity magnesium oxide and the chlorine product are simultaneously obtained through the in-situ pyrolysis, thereby achieving the value-added utilization of the secondary resources; and the waste heat of the fused magnesium chloride is utilized as a heat source, thereby greatly reducing energy consumption in the production process.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of secondary resources, in particular to a method for preparing high-purity magnesium oxide by melting magnesium chloride as a by-product of titanium sponge. Background technique [0002] High-purity magnesia refers to magnesia products with a content higher than 97%. This type of product is widely used in refractory materials, chemical raw materials, medicine, cement, In the pharmaceutical and food industry, the current annual demand gap for high-purity magnesium oxide in my country is about 90,000 tons, accounting for more than 90% of the total demand. At present, the production methods of magnesium oxide mainly include the following types: [0003] The brine soda ash method is to dilute the brine to a certain concentration with water first, then add it to a reaction device with stirring after being refined, and react with a certain concentration of soda ash solution at 55°C un...

AI Technical Summary

Problems solved by technology

[0008] The production of sponge titanium generally adopts the Kroll method, and most of them realize the recycling of magnesium and chlorine through the electrolysis of magnesium chloride. However, a considerable number of enterprises that produce sponge titanium in my country directly purchase titanium tetrachloride for magnesium reduction to produce sponge titanium, so that magnesium chloride becomes a by-product. Most enterprises do not deal with magnesium chloride and treat it as waste