A kind of preparation method of high-purity transparent crystal fused magnesia

Abstract

The invention discloses a preparation method of high-purity transparent crystal fused magnesia, which uses salt lake bischofite as a raw material, makes magnesium chloride generate magnesium hydroxide precipitation through an ammonia-lime method, and separates magnesium hydroxide from the solution , and then lightly burned with high-purity magnesium hydroxide to become lightly burned magnesium oxide. Then light-burned magnesia pressure balls are used as raw materials, smelted in a 5000KVA electric arc furnace, and smelted by high-voltage, high-current operating methods. In the later stage of smelting, refining operation should be carried out to increase the temperature of the melt to make the temperature of the melt reach more than 3000 degrees. After the smelting is completed, the melt must be cooled slowly to obtain high-purity MgO≥99%, SiO2≤0.1%, Fe2O3≤ 0.1%, CaO≤0.1%, transparent crystal fused magnesium frit.

Description

technical field [0001] The invention belongs to the field of electric fused magnesia, in particular to a preparation method of high-purity transparent crystal electric fused magnesia. Background technique [0002] At present, there are many kinds of processes and raw materials in the field of fused magnesia production. At present, the main raw material used is magnesite. Although its magnesium content is high, the existing production process cannot produce fused magnesia with high purity. Sand, due to the high content of SiO2, Fe2O3, and CaO in magnesite, it is very difficult to remove or reduce the content of these impurities. The flotation method currently used can only remove a part of impurities, so it is difficult to achieve a content of more than 99% of magnesium oxide by using the existing technology. Due to the existence of impurities, it is impossible to produce transparent crystals. Contents of the invention [0003] The object of the present invention is to pro...

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Problems solved by technology

[0002] At present, there are many kinds of processes and raw materials in the field of fused magnesia production. At present, the main raw material used is magnesite. Although its magnesium content is high, the existing production process cannot produce fused magnesia with high purity. Sand, due to the high content of SiO2, Fe2O3, and CaO in magnesite, it is very difficult to remove or reduce the content of these impurities

The flotation method currently used can only remove part of the impurities, so it is difficult to achieve a content of more than 99% of magnesium oxide with the existing technology. Due to the existence of impurities, it is impossible to produce transparent crystals.

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