Novel reduction method in pidgeon magnesium refining process

Abstract

The invention relates to reduction steps in a pidgeon magnesium refining process, in particular to a novel reduction method in the pidgeon magnesium refining process. The method comprises the following steps of: heating a reduction tank filled with pellets to the temperature of between 1,100 and 1,300 DEG C; keeping the temperature under vacuum; and performing a reduction reaction. The method is characterized by comprising the following step of: rotating the reduction tank in the heating process. By the reduction method, materials in the reduction tank can be stirred by rotating the reduction tank, so that the materials in the middle of the reduction tank can acquire heat in time; simultaneously, the working condition of high reaction vapor pressure of the materials in the middle is broken through, so that the materials can be fully reduced, reduction time is shortened, and reduction temperatures are reduced; and preset reduction time can be shortened to 6 hours, the average ratio of the materials to magnesium reaches 5.8 to 6.0, and standard fuels for reducing each ton of magnesium are reduced by 1,000kg.

Description

technical field [0001] The invention relates to a reduction step in the Pidgeon process for smelting magnesium, in particular to a novel reduction method in the Pidgeon process for smelting magnesium. Background technique [0002] The Pidgeon method for smelting magnesium is to mix the calcined dolomite and a certain amount of ferrosilicon (reductant) into powder and then press it into balls, put the pressed balls in the reduction tank, and pump the inside of the tank to below 13Pa vacuum; the reduction tank is placed in a heating furnace (also known as a reduction furnace) and heated at a temperature of about 1200 ° C, so that the calcined dolomite (MgO+CaO) and ferrosilicon undergo a reduction reaction, thereby replacing metal magnesium. The replaced metal magnesium vapor meets the crystallizer cooled by circulating water outside the tank and then crystallizes to become crude magnesium. The main purpose of evacuating the reduction tank is to reduce the energy of the reduc...

AI Technical Summary

Problems solved by technology

Two reasons contribute to the longer restore time

3. Due to the influence of heat transfer, the central material cannot reach the reduction reaction temperature within a certain period of time (11-12 hours), so some materials cannot be effectively reduced, thus affecting the reduction efficiency

4. Due to the extension of the reduction time, the energy consumption of the process is also increased

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