Preparation and production process of high-purity magnesium oxide

Abstract

The invention belongs to the technical field of chemical industry, food and medicine, and particularly relates to a preparation and production process of high-purity magnesium oxide. The process comprises the following steps: preparing high-purity magnesium oxide by using magnesium sulfate heptahydrate, activated carbon and water as raw materials, and drying and dehydrating the magnesium sulfate heptahydrate by using a drying kiln to obtain anhydrous magnesium sulfate; grinding the dried anhydrous magnesium sulfate by using a grinding machine; calcining and decomposing the ground anhydrous magnesium sulfate in a calcining kiln at high temperature to obtain magnesium oxide; carrying out secondary washing on the calcined magnesium oxide in a washing machine to remove soluble impurities such as soluble sulfate; filtering the washed magnesium oxide turbid liquid in a filter to obtain solid magnesium oxide; and carrying out high-temperature drying on the precipitated magnesium oxide in the calcining kiln again, and calcining to obtain the high-purity magnesium oxide product. Magnesium sulfate is directly calcined, so that the production cost of high-purity magnesium oxide is reduced, and magnesium oxide with a purity of 99% or more can be prepared.

Description

technical field [0001] The invention belongs to the technical fields of chemical industry, food and medicine, and in particular relates to a preparation and production process of high-purity magnesium oxide. Background technique [0002] Magnesium oxide (MgO) is a widely used chemical raw material, and its application field is mainly determined by its purity. High-purity magnesium oxide with a magnesium oxide content greater than 98% is widely used in electronics, electrical appliances, Optics, instruments, metallurgy, national defense and aerospace and other high-tech fields. [0003] At present, the methods for preparing magnesium oxide using magnesium sulfate include magnesium hydroxide precipitation method, ammonium bicarbonate method, etc. The precipitation method uses sodium hydroxide as a precipitant, which will increase production costs and is difficult to control the reaction conditions; the ammonium bicarbonate method has many process parameters and is difficult ...

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Problems solved by technology

[0003] At present, the methods for preparing magnesium oxide from magnesium sulfate include magnesium hydroxide precipitation method, ammonium bicarbonate method, etc. The precipitation method uses sodium hydroxide as a precipitant, which will increase production costs and is difficult to control the reaction conditions; the ammonium bicarbonate method has many process parameters and is difficult Problems such as production control, low pyrolysis efficiency, insufficient purity of magnesium oxide products, and high cost

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