Process for smelting magnesium through melting reduction

Abstract

The invention relates to a process for smelting magnesium through melting reduction. The process takes dolomite as main raw material, alumina and silicon dioxide as slagging agents and ferrosilicon alloy as a reducing agent, and comprises the following steps: 1, calcining dolomite to obtain calcined dolomite; 2, proportioning four materials, namely calcined dolomite, alumina, silicon dioxide and ferrosilicon alloy in certain percentage by mass; 3, uniformly mixing four proportioned furnace burdens, putting the mixture into a reaction container and performing reduction reaction at 1,550 to 1,650 DEG C under the pressure of 1,000 to 4,000 Pa; and 4, performing condensation and collection on the obtained magnesium vapor to obtain magnesium metal. As the furnace burdens are in a completely melted state at about 1,600 DEG C, reaction is performed in a fully liquid state, thus reaction speed is greatly raised. Meanwhile, the furnace burdens need no crushing, fine grinding or briquetting andcan be directly mixed and put into the reaction container, so the reaction is simple to control and easy to operate.

Description

Technical field [0001] The present invention involves a method of producing metal magnesium, especially a method that enables the reaction to use the melting state to react to the production of metal magnesium, which belongs to the field of metallurgy technology. Background technique [0002] The Pijiang method is currently the most widely used hot magnesium -refining process. It is to restore the white clouds with silicon -iron alloy under vacuum.The common problem existing in this method is that the reactor reacts with solid -state and solid state. The reaction temperature is 1100 ~ 1200 ° C. The pressure of the group is high and the response speed is slow.In order to accelerate the reaction process, the reactor often needs to be broken.Metal magnesium recovery rate is low, only about 65%.High energy consumption, serious environmental pollution, and low use of residue use. Invention content [0003] In response to the above deficiencies existing technology, the purpose of the ...

AI Technical Summary

Problems solved by technology

The general problem of this method is that the reactants react in solid state and solid state, the reaction temperature is 1100~1200°C, the pressure of pellet formation is high, and the reaction speed is slow.

Metal magnesium recovery rate is low, only about 65%

High energy consumption, serious environmental pollution, low utilization rate of reducing slag