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Method for preparing high-purity magnesium oxide by pyrolyzing magnesium sulfate

A technology of magnesium sulfate and magnesium oxide, applied in magnesium oxide and other directions, can solve the problems of low pyrolysis efficiency, high cost of natural gas, difficult to control reaction conditions, etc., and achieve the effect of effective recovery of resources, wide sources and easy access.

Active Publication Date: 2018-11-23
广西银亿新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are generally two methods for preparing magnesium oxide with magnesium sulfate: one is the precipitation method, that is, high-purity magnesium oxide is prepared by high-temperature calcination with magnesium sulfate and magnesium hydroxide as raw materials, and the purity of magnesium oxide prepared by this method can be as high as 99%. , but because this method uses sodium hydroxide as a precipitating agent, it will increase production costs and is not easy to control the reaction conditions; another method is to prepare magnesium oxide by pyrolysis of magnesium sulfate, that is, to prepare magnesium oxide by reducing magnesium sulfate with a solid reducing agent , the general solid-state reducing agent is coal, natural gas, etc. This method has problems such as many process parameters, difficult to control production, low pyrolysis efficiency, insufficient purity of magnesium oxide products, and high cost.
The invention patent with the publication number CN102173439B discloses a method for preparing high-purity magnesium oxide by reducing and pyrolyzing magnesium sulfate with natural gas, but this method requires the purity of the magnesium sulfate raw material to be greater than 99%, and the cost of natural gas is also high

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  • Method for preparing high-purity magnesium oxide by pyrolyzing magnesium sulfate

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Experimental program
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Effect test

Embodiment 1

[0021] Measure 100L of P204 extractant, wherein the volume ratio of P204 and solvent oil is 1:9, weigh 60g of lightly burned powder to make lightly burned powder with a mass percentage concentration of 10% lightly burned powder slurry, and P204 P204 magnesium soap was prepared by mixing extractant and lightly burned powder slurry, and the saponification rate of P204 magnesium soap was controlled at 15%; P204 magnesium soap was used to extract 100L high-magnesium wastewater to obtain magnesium sulfate raffinate, and the pH of the extraction was 2.5, which was high The components and concentrations of magnesium wastewater are: magnesium 22g / L, calcium 0.55g / L, nickel 0.6mg / L, cobalt 0.6mg / L, manganese 0.6mg / L, the components and concentrations of magnesium sulfate raffinate It is: magnesium 21.9g / L, calcium 0.08g / L, nickel 0.6mg / L, cobalt 0.6mg / L, manganese 0.6mg / L; the magnesium sulfate raffinate is deoiled and evaporated and concentrated in sequence to obtain 22.3kg seven Magn...

Embodiment 2

[0023] Measure 100L P204 extractant, wherein the volume ratio of P204 and solvent oil is 1:4, weigh 420g lightly burned powder to make lightly burned powder slurry with a mass percentage concentration of 20% lightly burned powder, and P204 P204 magnesium soap was prepared by mixing extractant and lightly burned powder slurry, and the saponification rate of P204 magnesium soap was controlled at 35%; P204 magnesium soap was used to extract 50L high-magnesium wastewater to obtain magnesium sulfate raffinate, and the pH of the extraction was 3, high The components and concentrations of magnesium wastewater are: magnesium 25g / L, calcium 0.5g / L, nickel 0.5mg / L, cobalt 0.6mg / L, manganese 0.5mg / L, the components and concentrations of magnesium sulfate raffinate It is: magnesium 24.5g / L, calcium 0.05g / L, nickel 0.5mg / L, cobalt 0.6mg / L, manganese 0.5mg / L; the magnesium sulfate raffinate is degreased and evaporated and concentrated in sequence to obtain 12.5kg seven Magnesium sulfate hyd...

Embodiment 3

[0025] Measure 100L P204 extractant, wherein the volume ratio of P204 and solvent oil is 1:5.7, weigh 180g lightly burned powder to make lightly burned powder slurry whose mass percentage concentration is 30%, and P204 P204 magnesium soap was prepared by mixing extractant and lightly burned powder slurry, and the saponification rate of P204 magnesium soap was controlled at 20%; P204 magnesium soap was used to extract 33L high-magnesium wastewater to obtain magnesium sulfate raffinate, and the pH of the extraction was 2.5, which was high The components and concentrations of magnesium wastewater are: magnesium 20g / L, calcium 0.15g / L, nickel 0.5mg / L, cobalt 0.5mg / L, manganese 0.5mg / L, the components and concentrations of magnesium sulfate raffinate For: Magnesium 20g / L, Calcium 0.01g / L, Nickel 0.5mg / L, Cobalt 0.5mg / L, Manganese 0.5mg / L; The magnesium sulfate raffinate was degreased and evaporated and concentrated in sequence to obtain 6.8kg heptahydrate Magnesium sulfate crystals...

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Abstract

The invention provides a method for preparing high-purity magnesium oxide by pyrolyzing magnesium sulfate. The method comprises the following steps of adopting a P204 extraction agent to be mixed withlight calcined powder slurry to prepare a P204 magnesium soap; adopting the P204 magnesium soap to perform extraction on high magnesium wastewater to obtain a magnesium sulfate raffinate; sequentially performing deoiling, evaporation and concentration on the magnesium sulfate raffinate to obtain a heptahydrate magnesium sulfate crystal; sequentially performing calcining and grinding on the heptahydrate magnesium sulfate crystal to obtain anhydrous magnesium sulfate powder; and mixing the anhydrous magnesium sulfate powder with petroleum coke powder, and performing pyrolysis to obtain the high-purity magnesium oxide. In the method provided by the invention, as the raw materials are petroleum coke and the high magnesium wastewater, the high magnesium wastewater is wide in source and can beeffectively recycled at the same time, and the petroleum coke is low in cost and liable to acquire; and the purity of the high-purity magnesium oxide as an acquired target product is larger than 99.5percent and can achieve and exceed the purity of the high-purity magnesium oxide acquired with the existing method.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for preparing high-purity magnesium oxide by pyrolyzing magnesium sulfate. Background technique [0002] Magnesium oxide, as a chemical raw material with a wide range of uses, plays an important role in metallurgy, chemical industry, food, medicine, agriculture and other fields. At present, there are generally two methods for preparing magnesium oxide with magnesium sulfate: one is the precipitation method, that is, high-purity magnesium oxide is prepared by high-temperature calcination with magnesium sulfate and magnesium hydroxide as raw materials, and the purity of magnesium oxide prepared by this method can be as high as 99%. , but because this method uses sodium hydroxide as a precipitating agent, it will increase production costs and is not easy to control the reaction conditions; another method is to prepare magnesium oxide by pyrolysis of magnesium sulfate, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/12
CPCC01F5/12C01P2006/80
Inventor 田建华王小丰张学飞谢华思罗丛霞
Owner 广西银亿新材料有限公司