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Production method for co-producing high-purity magnesium hydroxide and high-purity potassium nitrate

The technology of a kind of magnesium hydroxide and production method is applied in the field of preparation of magnesium hydroxide and potassium nitrate, which can solve the problems of environmental pollution, waste water pollution environment, low output, etc., and achieve simple and easy production method, easy control of conditions and low production cost. low effect

Inactive Publication Date: 2019-05-07
QINGHAI ENESOON NEW MATERIAL TECH & SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prior art synthetic magnesium hydroxide mostly has the following problems, the method for producing magnesium hydroxide with calcium hydroxide, the calcium content is higher in the magnesium hydroxide produced by this method, and the purity is lower; or the technology of producing magnesium hydroxide with magnesium chloride ammonia water , the product is single and will produce a large amount of waste water to pollute the environment; or use the obtained mother liquor to produce magnesium hydroxide in the process of circulating potassium nitrate preparation, but the yield is low and the purity is low, or use calcium hydroxide as a precipitant to produce magnesium hydroxide process, but this process will produce a large amount of calcium chloride by-products that cannot be used, and are currently discharged directly, causing environmental pollution problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A production method of high-purity magnesium hydroxide and potassium nitrate co-production, comprising the following steps:

[0027] (1) Add magnesium oxide with a mass purity of 70% and concentrated nitric acid solution with a concentration of 96% into the first reaction kettle at a mass mixing ratio of 2:3, keep the temperature in the first reaction kettle at 50°C, and fully After the reaction, filter to remove incompatible matter, and the gained solution enters the second reaction kettle;

[0028] (2) Inject ammonia water with a concentration of 25% into the second reaction kettle, the injection amount of ammonia water is 150% of the mass ratio of magnesium oxide, mix evenly with the solution obtained in step (1), and centrifuge to obtain hydrogen after fully reacting Magnesium oxide precipitation and first mother liquor;

[0029] (3) After adding water to the magnesium hydroxide in step (2), washing with water, centrifuging, and calcining and drying to obtain high-...

Embodiment 2

[0035] A production method of high-purity magnesium hydroxide and potassium nitrate co-production, comprising the following steps:

[0036] (1) Mix magnesium oxide with a mass purity of 90% and concentrated nitric acid solution with a concentration of 96% according to a mass ratio of 2:3, then add it to the first reaction kettle, and keep the temperature in the first reaction kettle at 70°C. After fully reacting, filter to remove incompatible substances, and the resulting solution enters the second reaction kettle;

[0037] (2) Inject ammonia water with a concentration of 25% into the second reaction kettle, the injection amount of the ammonia water is 150% of the mass ratio of magnesium oxide, mix evenly with the solution obtained in step (1), and after fully reacting, centrifuge Obtain magnesium hydroxide precipitation and first mother liquor;

[0038] (3) After adding water to the magnesium hydroxide in step (2), washing with water, centrifuging, calcining and drying to ob...

Embodiment 3

[0045] A production method of high-purity magnesium hydroxide and potassium nitrate co-production, comprising the following steps:

[0046] (1) Add magnesium oxide with a mass purity of 80% and concentrated nitric acid solution with a concentration of 96% into the first reaction kettle at a mass mixing ratio of 2:3, keep the temperature in the first reaction kettle at 60°C, and fully After the reaction, filter to remove incompatible matter, and the gained solution enters the second reaction kettle;

[0047] (2) Inject ammonia water with a concentration of 25% into the second reaction kettle, the injection amount of ammonia water is 150% of the mass ratio of magnesium oxide, mix evenly with the solution obtained in step (1), and centrifuge to obtain hydrogen after fully reacting Magnesium oxide precipitation and first mother liquor;

[0048] (3) After adding water to the magnesium hydroxide in step (2), washing with water, centrifuging, calcining and drying to obtain high-puri...

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Abstract

The invention discloses a production method for co-producing high-purity magnesium hydroxide and high-purity potassium nitrate. According to the present invention, high-purity magnesium hydroxide, high-purity potassium nitrate crystal and ammonium chloride crystal containing calcium, magnesium, potassium and other elements are prepared by using low-quality magnesium oxide or magnesium hydroxide asa raw material through acidolysis, alkali precipitation and other steps, wherein the by-products produced in the process are effectively utilized; and the whole production process is performed at a low temperature, no by-product is formed, and the method is efficient and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of preparation of magnesium hydroxide and potassium nitrate, and in particular relates to a production method of co-production of high-purity magnesium hydroxide and potassium nitrate. Background technique [0002] Magnesium hydroxide material is a very important thermal insulation refractory material at present, especially high-purity magnesium oxide has a high market value. The preparation method of magnesium hydroxide has two kinds of physical method and chemical synthesis method. The physical synthesis method has high requirements on preparation equipment, high production cost, and is difficult to popularize. The chemical synthesis method is simple and convenient, and is an important way to produce magnesium hydroxide. The prior art synthetic magnesium hydroxide mostly has the following problems, the method for producing magnesium hydroxide with calcium hydroxide, the calcium content is higher in the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/20C01D9/18C01C1/16C05C3/00
Inventor 曾智勇陈祖新程勇景银德伊国生张玉珍
Owner QINGHAI ENESOON NEW MATERIAL TECH & SCI CO LTD
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