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Process for producing high purity magnesia

A production method and technology of magnesia, applied in the field of producing high-purity magnesia, high-purity magnesia and hydrochloric acid, and high-purity active magnesia, can solve problems such as loss and pollution, difficult operation, pollution, etc., and achieve low production cost and technical route Short, non-polluting effect on the environment

Inactive Publication Date: 2005-12-07
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] At present, our traditional craftsmanship is difficult to participate in international competition due to its low technological content.
The lime (or dolomite) method and carbonization method currently being used in China not only consume high energy consumption, but also are difficult to solve the problem of excessive calcium content; the more advanced ammonia method and carbon ammonia method in China, although these methods can produce high-grade oxidation Magnesium products, but there are still several problems: that is, magnesium oxide and magnesium carbonate must be dissolved in ammonia solution, and to maintain this balance, ammonia must be continuously supplemented, and there is a pollution problem. Magnesia is produced by magnesium hydroxide and magnesium carbonate At the same time, it is necessary to press the ball or die after molding, which leads to high energy consumption and difficult operation, which is difficult for the cost.
This method needs to be calcined three times. When the intermediate product magnesium hydroxide is dead-burned, dust is easy to fly, causing loss and pollution. Therefore, ball pressing or molding is required, which increases equipment investment and production cycle.

Method used

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Examples

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Effect test

Embodiment 1

[0023] A. Vacuum evaporation: Evaporate the old brine in vacuum at a vacuum degree of 0.06-0.07MPa and a temperature of 120°C;

[0024] B. Sedimentation and separation: heat preservation and sedimentation in a heat preservation settler at a temperature of 105°C for 3 hours, and cool and crystallize the clear liquid in a crystallizer, and the crystallization termination temperature is 30-40°C;

[0025] C. Spray pyrolysis: The above-mentioned high-concentration raw material purification solution is pyrolyzed in a dynamic pyrolysis furnace in the form of spray, the temperature is about 300°C, and the reaction time is 3-6 seconds;

[0026] D. Dynamic calcination: put the basic magnesium chloride superfine powder obtained after spray pyrolysis into a high-temperature dynamic calcination furnace for calcination, the calcination time is 5-10 seconds, and the high-purity activity can be obtained by controlling the calcination temperature at 600-650°C magnesium oxide;

[0027] E. Crus...

Embodiment 2

[0031] 1. Vacuum evaporation: vacuum evaporate the old brine under the conditions of vacuum degree 0.06MPa and temperature 120℃;

[0032] 2. Sedimentation and separation: it is carried out in a heat preservation settler with a heat preservation temperature of 105°C;

[0033] 3. Spray pyrolysis: The above-mentioned high-concentration raw material solution is sprayed in a dynamic pyrolysis furnace at a temperature of about 300°C and a reaction time of 3-6 seconds;

[0034] 4. Dynamic calcination: the basic magnesium chloride superfine powder obtained after spray pyrolysis is put into a high-temperature dynamic calcination furnace for calcination, the calcination temperature is controlled at about 700°C, and the calcination time is 5-10 seconds to produce high-purity oxidation magnesium;

[0035] 5. Pulverizing and washing: the calcined coarse magnesium oxide powder is pulverized and washed in a pulverizing washing machine, and the solid-liquid ratio is controlled at 1.3:10;

...

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Abstract

The invention discloses a process for preparing high purity magnesium oxide products, which consists of using brine containing magnesium chloride from sea, lakes or crude magnesium chloride hexahydrate as raw material, purifying the brine through vacuum crystallization method, removing boron, sulfate radicals, calcium ions and soluble impurity substance in the raw material, finally carrying out dynamic calcinations.

Description

technical field [0001] The invention relates to the technical field of marine chemical engineering in inorganic chemical engineering, and more specifically relates to a method for producing high-purity magnesium oxide, high-purity active magnesium oxide, high-purity magnesia and hydrochloric acid by using brine containing magnesium chloride in oceans and salt lakes as raw materials. Background technique [0002] High-purity magnesium oxide series products are magnesium salt fine chemical products, widely used in steel industry, rubber, high-grade cables, high-grade plastics, paint, ceramics, high-grade papermaking and pharmaceutical industries. More than 99% of high-purity magnesium oxide is used in the production of oriented silicon steel Tablet of the best chemical raw materials. High-purity magnesia is the main raw material for high-grade refractory carbon-magnesia bricks used in metallurgy and cement industries [0003] At present, the raw ...

Claims

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Application Information

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IPC IPC(8): C01F5/06
Inventor 陈侠袁建军
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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