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Method for preparing magnesium hydroxide, magnesium and magnesium aluminate spinel by bischofite

A magnesia-aluminum spinel and bischofite technology, which is applied in the field of magnesium metallurgy and magnesium chemical industry, can solve the problems of high energy consumption, equipment corrosion, and high energy consumption in the dehydration process, and achieve good high-temperature performance and slag erosion resistance. Realize the effect of comprehensive utilization and low impurity content

Inactive Publication Date: 2012-12-12
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of producing magnesium chloride anhydrous by dehydrating bischofite as raw material and then electrolyzing anhydrous magnesium chloride to produce metal magnesium, bischofite should be dehydrated under hydrogen chloride or chlorine atmosphere, and every 2-3 tons of bischofite can obtain a 1 ton of anhydrous magnesium chloride, every 4 tons of magnesium chloride can be electrolyzed to generate one ton of metal magnesium, so more than 10 tons of bischofite need to be dehydrated to produce one ton of metal magnesium. During the electrolysis of anhydrous magnesium chloride, the energy consumption is high, the investment in environmental protection equipment is large, the cost is high, and the formation of chloride electrolyte mud causes serious environmental pollution.
[0004] Therefore, the current methods for processing bischofite have certain limitations, and there is no method that can realize the efficient and reasonable utilization of bischofite

Method used

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  • Method for preparing magnesium hydroxide, magnesium and magnesium aluminate spinel by bischofite
  • Method for preparing magnesium hydroxide, magnesium and magnesium aluminate spinel by bischofite
  • Method for preparing magnesium hydroxide, magnesium and magnesium aluminate spinel by bischofite

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preparation example Construction

[0041] The equipment used to prepare the finished magnesium aluminum spinel is an industrial rotary kiln.

[0042] The equipment used to prepare the finished fused magnesia-aluminum spinel is an industrial electric arc furnace.

Embodiment 1

[0044] Preparation of magnesium hydroxide, magnesium oxide, magnesium and magnesium aluminum spinel by electrolysis of schoffite:

[0045] (1) Dissolve and prepare the bischofite into MgCl 2 An aqueous solution with a mass percentage of 20%;

[0046] (2) Electrolysis, electrolyze the magnesium chloride aqueous solution, the electrolysis temperature is 20℃, the direct current, the current density is 1.0A / cm 2 , Add bischofite and water every 30 minutes to maintain MgCl 2 The mass percentage is 10~30%, and the magnesium hydroxide is taken out every 30 minutes;

[0047] (3) Drying, drying the magnesium hydroxide at 250°C for 1.0 hour;

[0048] (4) Calcining, calcining the dried magnesium hydroxide at 500°C for 10 hours, after cooling, grinding, and screening magnesium oxide powder with a particle size of less than 120 mesh;

[0049] (5) To make magnesium, mix magnesium oxide powder with aluminum powder with a particle size of 120 mesh, the mass ratio of magnesium oxide powder to aluminum p...

Embodiment 2

[0053] Preparation of magnesium hydroxide, magnesium oxide, magnesium and magnesium aluminum spinel by electrolysis of schoffite:

[0054] (1) Dissolve and prepare the bischofite into MgCl 2 An aqueous solution with a mass percentage of 30%, then the magnesium chloride solution is added to the electrolytic cell, and 1% sodium chloride is added to the solution;

[0055] (2) Electrolysis, electrolysis of magnesium chloride aqueous solution, electrolysis temperature 80℃, direct current, current density 0.8A / cm 2 , Add bischofite and water every 60 minutes to maintain MgCl 2 The mass percentage is 3-20%, and the magnesium hydroxide is taken out every 60 minutes;

[0056] (3) Drying, drying the magnesium hydroxide at 225°C for 1.5 hours;

[0057] (4) Calcining, calcining the dried magnesium hydroxide at 500°C for 10 hours, after cooling, grinding, and screening magnesium oxide powder with a particle size of less than 120 mesh;

[0058] (5) To make magnesium, mix magnesium oxide powder and al...

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Abstract

The invention discloses a method for preparing magnesium hydroxide, magnesium and magnesium aluminate spinel by bischofite and belongs to the field of magnesium metallurgy and chemical industry. The method comprises the steps of: taking bischofite as a raw material to produce magnesium hydroxide, hydrogen gas and chlorine gas through electrolysis, and then taking magnesium oxide, which is obtained by calcining magnesium hydroxide, as a raw material to produce magnesium metal and magnesium aluminate spinel through vacuum thermal reduction. The by-product, i.e., bischofite, during extraction of potassium salt and lithium salt in west salt lakes and in the salt manufacturing industry of the eastern coastal regions, is utilized for producing the magnesium hydroxide, magnesium oxide and magnesium aluminate spinel, therefore, the purpose of changing waste into valuable is realized. Compared with the traditional electrolysis technology of fused magnesium chloride, the method has the characteristics of low energy consumption, low cost, small environment pollution and the like.

Description

Technical field [0001] The invention belongs to the fields of magnesium metallurgy and magnesium chemical industry, and particularly relates to a method for producing magnesium hydroxide, magnesium and magnesia aluminum spinel with hydrochlorite. Background technique [0002] my country's Qinghai Province and Tibet Autonomous Region are rich in salt lake resources. The salt lake water is rich in potassium, lithium and other resources. The Chaerhan Salt Lake in Qinghai Province is my country's largest potash fertilizer production base. In the process of using salt lake water to extract potassium and lithium, a large amount of by-product-brucite is produced. In the production of potash fertilizer, every 1 ton of potassium chloride produced can produce 10 tons of brucite, and the annual by-product of Chaerhan Salt Lake More than 20 million tons of bischofite. In addition, in the process of using seawater to produce salt on the eastern coast of my country, a large amount of brucite ...

Claims

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Application Information

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IPC IPC(8): C25B1/20C22B26/22C01F5/08C01F7/16
CPCY02P10/20
Inventor 王耀武冯乃祥
Owner NORTHEASTERN UNIV
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