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

A technology of transparent crystal and fused magnesia, applied in the field of fused magnesia, can solve the problems of difficulty in removing or reducing impurities, unable to produce pure fused magnesia, impossible to produce transparent crystals, etc. The effect of excellent erosion performance, large crystal grains and dense structure

CN109879612BActive Publication Date: 2021-10-01HENAN TENAI SPECIAL REFRACTORIES CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-10-01

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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.
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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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Embodiment Construction

[0013] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0014] The preparation method of high-purity transparent crystal fused magnesia of the present invention, the steps of described preparation method are as follows:

[0015] 1) Using salt lake bischofite as the initial raw material, magnesium hydroxide (MgCl 2 +Ca(OH) 2 →Mg(OH) 2 +CaCl 2 ), then lightly burn to generate lightly burned magnesia, the lightly burned temperature is 900°C and heat preservation for 1 hour, and the lightly burned magnesia is presse...