Method for preparing magnesia by taking magnesium chloride containing brine as raw material

A technology of magnesium chloride and magnesium oxide, which is applied in the field of salt chemical industry, can solve the problems of difficult control of the reaction process and unstable product quality, and achieve the effects of good crystal shape, reduced energy consumption, and improved environment

Inactive Publication Date: 2009-12-23
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0030] Carbon dioxide and ammonia as raw materials are relatively cheap and have significant economic benefits, but this reaction involves a gas-liquid-solid three-phase reaction, the reaction process is difficult to control, and the product quality is unstable

Method used

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  • Method for preparing magnesia by taking magnesium chloride containing brine as raw material
  • Method for preparing magnesia by taking magnesium chloride containing brine as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] See figure 2 . The jacketed reaction tank used is provided with a circulating water inlet and outlet b on the upper and lower parts of the outer wall of the tank a, one end of the stirring shaft c is connected to the external motor of the tank, and the other end extends into the tank. Stirring blades d are installed on the stirring shaft c in the body, four baffles e are fixedly installed on the inner wall of the tank, and the dripping nozzle f, thermometer socket g, and pH meter socket h are opened on the upper part of the tank body.

[0071] Process flow of the present invention please refer to figure 1 .

[0072] 1) The original brine is naturally evaporated and concentrated in the salt field, and sodium chloride, potassium chloride, potassium sulfate, magnesium sulfate, magnesium potassium double salt, etc. are crystallized respectively, and crystallization mother liquor I containing magnesium chloride is obtained simultaneously;

[0073] 2) The magnesium chlori...

Embodiment 2

[0078] The jacketed reaction tank used in Example 1 was used.

[0079] 1) The original brine is naturally evaporated and concentrated in the salt field, and sodium chloride, potassium chloride, potassium sulfate, magnesium sulfate, magnesium potassium double salt, etc. are crystallized respectively, and a crystallization mother liquor containing magnesium chloride is obtained at the same time;

[0080] 2) Precipitate the crystallization mother liquor containing magnesium chloride obtained in step 1), filter to remove impurities and crystals, and obtain refined brine with a magnesium chloride content of 4.5mol / L;

[0081] 3) The refined brine containing magnesium chloride obtained in step 2) is adjusted with deionized water, and is prepared with 2000ml of magnesium chloride reaction bottom liquid with an initial concentration of 2mol / L, and the pH value of the magnesium chloride reaction bottom liquid is adjusted to 3 with dilute hydrochloric acid;

[0082] 4) the magnesium chl...

Embodiment 3

[0085] The jacketed reaction tank used in Example 1 was used.

[0086] 1) The original brine is naturally evaporated and concentrated in the salt field, and sodium chloride, potassium chloride, potassium sulfate, magnesium sulfate, magnesium potassium double salt, etc. are crystallized respectively, and a crystallization mother liquor containing magnesium chloride is obtained at the same time;

[0087] 2) Precipitating the crystallization mother liquor containing magnesium chloride obtained in step 1), filtering to remove impurities and crystals, and obtaining refined brine with a magnesium chloride content of 4mol / L;

[0088]3) The refined brine containing magnesium chloride obtained in step 2) is adjusted with deionized water to prepare 2000ml of magnesium chloride reaction bottom solution with an initial concentration of 3mol / L, and the pH value of the magnesium chloride reaction bottom solution is adjusted to 2 with dilute hydrochloric acid;

[0089] 4) the magnesium chlor...

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Abstract

The invention belongs to the field of salt chemical engineering, in particular relates to a method for preparing magnesia by taking magnesium chloride containing brine as a raw material. The method comprises the following steps of: obtaining an intermediate (the purity is 99.0 percent) of magnesium carbonate trihydrate with good needle-shaped crystalline form by taking the magnesium chloride containing brine as the raw material and sodium carbonate as a precipitator and controlling the reaction conditions of reaction temperature, stirring rotary speed and charging speed of the sodium carbonate and the like; calcining the obtained intermediate of the needle-shaped magnesium carbonate trihydrate crystal at a high temperature to prepare high-purity magnesium oxide (the purity is 99.4 percent); after reaction, filtering a coarse product of the magnesium carbonate trihydrate to obtainsodium chloride containing crystalline mother liquor; by vaporizing, condensing and crystallizing the crystalline mother liquor, extracting a sodium chloride crystal; and filtering the sodium chloride crystal to obtain a sodium chloride crystal. The method aims to produce the intermediate of the needle-shaped magnesium carbonate trihydrate by rich brine from sea and salt lakes, and further prepares the high-purity magnesia. The method has the advantages of good economic benefits, no environmental pollution, strong operability and easy realization of industrialization.

Description

technical field [0001] The invention belongs to the field of salt chemical industry, and particularly relates to a method for producing high-purity magnesium oxide and sodium chloride by using sodium carbonate as a precipitating agent and using needle-shaped magnesium carbonate trihydrate crystals formed by reacting in brine containing magnesium chloride as an intermediate . technical background [0002] There are as many as several hundred kinds of magnesium compound products, among which magnesium oxide series products have the largest demand and the most varieties. Magnesium oxide can be widely used in papermaking, chemical industry, rubber, medicine, animal husbandry, refractory materials, metal magnesium extraction, construction, military industry and other fields. The 2006 annual world magnesia production statistics show that my country's magnesia production capacity ranks first in the world, with an annual output of about 3.23 million tons. At present, the domestic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/06
Inventor 李志宝程文婷
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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