Preparation method of high-purity transparent crystal fused magnesia

Abstract

The invention discloses a preparation method of high-purity transparent crystal fused magnesia. According to the preparation method, salt lake water chloromagnesite is adopted as a raw material, magnesium chloride generates magnesium hydrate sediments through an ammonia-lime method, magnesium hydrate is separated from a solution, and then the high-purity magnesium hydrate is slightly roasted to become slightly roasted magnesium oxide; the slightly roasted magnesium oxide is pressed into spheres to serve as raw materials, the spheres are smelted through an electric-arc furnace of 5000 KVA, andfusion is carried out through a high-voltage and high-current operation method; and at the later period of fusion, refining operation needs to be carried out, the temperature of fused liquid is increased to reach 3000 DEG C or above, after melting is completed, a molten lump has to be cooled slowly, and a high-purity transparent crystal fused magnesia clinker is obtained, wherein MgO is larger than or equal to 99%, SiO2 is smaller than or equal to 0.1%, Fe2O3 is smaller than or equal to 0.1%, and CaO is smaller than or equal to 0.1%.

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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