A thermal magnesium smelting process

Abstract

The present invention relates to a magnesium smelting process, in particular to a thermal magnesium smelting process. The smelting process comprises the following steps: first, the ore raw material containing magnesium carbonate, the reducing agent, and the fluorite catalyst are crushed, and a reasonable Proportionally mixed and ground into powder, then the mixed powder is extruded into agglomerates with a press, and the pressed pellets are placed in a closed reactor, and finally the balls are heated, exhausted, and heated , vacuuming to produce metal magnesium; the invention has unique process method, good environmental protection effect and high utilization rate of raw materials.

Description

technical field [0001] The invention relates to a magnesium smelting process, in particular to a thermal magnesium smelting process. Background technique [0002] The traditional thermal magnesium smelting process is as follows: one is to crush the raw material containing magnesium carbonate into a certain particle size → add it to the calciner kiln for calcination to decompose and discharge CO 2 → will not contain CO after calcination 2 The raw materials, reducing agent and fluorite catalyst are uniformly mixed, ground into powder → pressed into pellets → loaded into the reducer → heated to reduce magnesium vapor → cooled magnesium vapor to obtain solid or liquid magnesium; the other is magnesium carbonate containing The ore raw material is crushed into a certain particle size → put into the calciner kiln for calcining and decomposing to discharge CO 2 → will not contain CO after calcination 2 The raw materials, reducing agent, and fluorite catalyst are ground into powde...

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Problems solved by technology

[0004] (1) In the calcination kiln, the raw material containing magnesium carbonate is directly burned by the direct heating of the fuel, that is, the flame and the flue gas directly burn the raw material to decompose CO 2 , the CO emitted by its calcination 2 It is mixed with gas and smoke generated by fuel combustion, not pure single-component CO 2 Gas, which is not conducive to its comprehensive utilization and treatment, is usually directly discharged into the atmosphere, forming a greenhouse gas effect;

[0005] (2) The carbon dioxide produced after calcination in the calciner kiln does not contain CO 2 The raw materials will absorb moisture and CO in the air during storage, transportation and briquetting. 2 Combination into the state of magnesium carbonate before calcination causes the reduction of the active ingredients of the raw materials in the subsequent reduction process and reduces the magnesium production rate of the reduction process;

[0006] (3) Due to the consideration of flue gas permeability and other factors during the calcination process, there are certain requirements for the particle size of magnesium carbonate-containing ore raw materials, and finely crushed magnesium carbonate-containing ores smaller than a certain size cannot be used as raw materials for magnesium smelting;

[0007] (4) Calcination and reduction are completed twice in two sets of equipment, and the calcination system is huge in equipment, complicated in operation, energy consumption accounts for about half of the energy consumption of the whole plant, and the storage and transportation process of raw materials is long, causing energy, raw materials, Significant waste of labor, especially equipment investment

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