Method and device for continuous extraction of crystalline magnesium in Pidgeon magnesium smelting process at high temperature

Abstract

A method and device for continuous extraction of crystalline magnesium in the Pidgeon process for magnesium smelting at high temperature. The present invention aims at the above-mentioned problems existing in the Pidgeon process for magnesium smelting and its derivative processes. With the characteristics of small mutual wettability, the dynamic porous filter formed by the refractory metal / ceramic sphere group is used as the crystallization carrier of magnesium crystallization steam. A perforated plate is used to separate the metal or ceramic ball flow channel from the magnesium vapor flow channel. The hole diameter of the porous plate is smaller than the diameter of the metal or ceramic sphere. When magnesium vapor encounters low-temperature refractory metal or ceramic particles, it cools down and liquefies or crystallizes, while the refractory metal particles or ceramic particles heat up to over 500°C due to heat exchange with magnesium vapor. The refractory metal particles or ceramic particles with a temperature >500°C leave the magnesium condensation zone with the liquefied magnesium or crystallized magnesium on the surface.

Description

technical field [0001] The invention relates to a smelting process and a device for reducing magnesium by the Pidgeon method, in particular to a method and a device for continuously extracting crystalline magnesium in the magnesium smelting process by the Pidgeon method. Background technique [0002] The reduction of magnesium by the Pidgeon method is to heat the raw material in the reduction tank made of heat-resistant steel. Under the vacuum condition of up to 1200 °C, a reduction reaction occurs to generate elemental magnesium and gasify into magnesium vapor, and then migrate to the cooling zone to condense into crystalline magnesium. method. So as to realize the smelting process from ore raw material to metal crude magnesium. After the reduction is completed, the vacuum is released, the reduced crystalline magnesium is taken out, and the reacted solid waste residue is cleaned. Because the method is simple in process and low in investment, it is the most important prepa...

AI Technical Summary

Problems solved by technology

In this process, one is that the crystalline magnesium can only be extracted once and cannot be continuously extracted; the other is that the temperature of the extracted crystalline magnesium is close to room temperature, and the re-refining needs to raise the temperature here

thus wasting energy

The third is to use water cooling method for cooling, which consumes a lot of water and has low recovery value, resulting in a certain loss of energy.

When refining again, secondary heating and melting are required, resulting in energy waste;

[0008] 3. Artificial extraction is intensive, dangerous, and poor environment

[0009] 4. Using water cooling method to cool crystalline magnesium, the water consumption is large, the recovery value is low, and there is a certain loss of energy.

Images