Method for preparing light magnesium carbonate and magnesium oxide from dolomite sea water bittern

A light magnesium carbonate and dolomite technology, applied in the production of magnesium oxide, magnesium carbonate, lime, etc., can solve the problems of high production cost, large water consumption, and high energy consumption, and achieve lower production costs, water consumption, and energy consumption. can reduce the effect

Inactive Publication Date: 2008-12-24
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of high energy consumption, large water consumption, and high production cost in the production of light magnesium carbonate and magnesium oxide in the prior art, the present invention proposes to produce light magnesium carbonate and magnesium oxide on the basis of improving the brine carbonization method. The new method, through the use of heavy magnesium water to add alkaline substances, replaces the traditional dolomite carbonization method and brine carbonization method to produce light magnesium carbonate by pyrolysis of heavy magnesium hydrolysis, reducing energy consumption of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The dolomite is calcined in a muffle furnace at a temperature of 950° C. The composition of the calcined dolomite is: MgO 41.40%, CaO 58.28%. Lightly burned dolomite is digested with water to make dolomite milk. According to the ratio of calcium hydroxide in dolomite milk and magnesium ion molar ratio in seawater brine of 0.6:1, dolomite milk and seawater brine were mixed and stirred for reaction, the reaction time was 30 minutes, and the reaction was completed by hydraulic filtration to obtain Mg(OH) 2 42.10%, CaO 0.23% magnesium hydroxide filter cake.

[0035] Get described magnesium hydroxide filter cake, press magnesium hydroxide filter cake: water is the ratio (mass ratio) of 1: 8.36, add water, stir and mix and be formulated into containing Mg(OH) 2 4.5% magnesium hydroxide slurry, pass into the above-mentioned magnesium hydroxide slurry containing CO 2 38% purified compressed kiln gas with a pressure of 0.25MPa, controlled reaction temperature not higher than 3...

Embodiment 2

[0039] The dolomite is calcined in a muffle furnace at a temperature of 950° C. The composition of the calcined dolomite is: MgO 41.40%, CaO 58.28%. Lightly burned dolomite is digested with water to make dolomite milk. According to the ratio of calcium hydroxide in dolomite milk and magnesium ion molar ratio in seawater brine of 0.7:1, dolomite milk and seawater brine were mixed and stirred for reaction, the reaction time was 30 minutes, and the reaction was completed by hydraulic filtration to obtain Mg(OH) 2 42.10%, CaO 0.23% magnesium hydroxide filter cake.

[0040] Get above-mentioned magnesium hydroxide filter cake and mix with and analyze magnesium mother liquor and be mixed with Mg(OH)-containing 2 4.5% magnesium hydroxide slurry, pass into the above-mentioned magnesium hydroxide slurry containing CO 2 38% purified compressed kiln gas with a pressure of 0.25MPa, controlled reaction temperature not higher than 30°C, controlled carbonization time of 30 minutes to obtain...

Embodiment 3

[0044] The dolomite is calcined in a muffle furnace at a temperature of 950° C. The composition of the calcined dolomite is: MgO 42.30%, CaO 56.58%. According to the ratio of calcium hydroxide in dolomite milk and magnesium ion molar ratio in brine of 0.8:1, dolomite milk is added to brine and stirred for reaction, and the reaction is completed by hydraulic filtration to obtain Mg(OH) 2 45.10%, CaO 0.80% magnesium hydroxide filter cake.

[0045] Take the above filter cake and mix it with water to prepare Mg(OH)-containing 2 4.5% magnesium hydroxide slurry, pass into the above-mentioned magnesium hydroxide slurry containing CO 2 28% purified compressed kiln gas with a pressure of 0.30 MPa, controlled reaction temperature not higher than 25°C, and controlled carbonization time of 58 minutes to obtain carbonized liquid. The above-mentioned carbonized solution was filtered, and the filter residue was removed to obtain heavy magnesium water. The content of magnesium bicarbonate i...

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Abstract

The invention relates to a method for preparing light magnesium carbonate and magnesia using dolomite and sea water brine as materials. The dolomite is calcined to light fired dolomite and kiln gas, wherein the light fired dolomite reacts with the sea water brine to obtain magnesium hydroxide, the magnesium hydroxide is added into the magnesium-precipitation mother liquor to obtain a slurry of magnesium hydroxide, the kiln gas containing carbon dioxide of higher concentration is used for carbonizing the slurry of magnesium hydroxide. The magnesium bicarbonate solution is obtained by reacting the magnesium hydroxide slurry with compressed kiln gas which is cooled and purified in a carbonization tower. The basic magnesium carbonate is precipitated at room temperature by adding alkaline matters into the magnesium bicarbonate solution after pressure filtration and refine. The mixture solution is filtered or centrifugal separated to obtain wet basic magnesium carbonate and magnesium-precipitation mother liquor, the wet basic magnesium carbonate is dried to obtain light magnesium carbonate, the light magnesium carbonate is calcined to obtain light magnesium hydroxide. The method of the invention has advantages of low energy consumption, high resource utilization and obvious economic benefit without by product of calcium carbonate with low added value.

Description

technical field [0001] The invention relates to the preparation technology of light magnesium carbonate and magnesium oxide in the field of inorganic chemical industry, in particular to a method for preparing light magnesium carbonate and magnesium oxide by using dolomite and seawater brine. Background technique [0002] Light magnesium carbonate and magnesium oxide are important chemical raw materials. Light magnesium carbonate is widely used as filler and reinforcing agent for rubber products, heat insulation and high temperature resistant materials, daily chemicals, medical supplies and anti-caking agents, etc.; Magnesium oxide is mainly used in ceramics, enamel, refractory materials, rubber accelerators and catalysts, etc. [0003] At present, in the production of light magnesium carbonate and magnesium oxide, dolomite is mainly used as raw material, the light calcined dolomite obtained by calcining dolomite is digested with water to obtain magnesium hydroxide, and the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/24C01F5/06C04B2/10
CPCY02P40/40
Inventor 张雨山黄西平王俐聪刘骆峰曹冬梅
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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