Method and apparatus for production of basic magnesium carbonate and magnesium oxide whisker from magnesite

A technology of magnesium oxide whiskers and magnesium carbonate whiskers, which is applied in chemical instruments and methods, single crystal growth, crystal growth and other directions, can solve the problems of inability to realize carbon tempering of materials, high production cost, unfavorable environmental protection and the like, and achieves the realization of The process is green, the formation is simple, and the effect of friendliness is achieved

Inactive Publication Date: 2016-10-12
李治涛
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The above-mentioned preparation method of magnesium oxide whiskers adds industrial acid and alkali, which is easy to corrode equipment pipelines and cannot realize carbon tempering of materials; and the production process is complicated, operation is difficult, production cost is high, and a large amount of waste waste gas is generated during the production process, which is not conducive to environmental protection

Method used

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  • Method and apparatus for production of basic magnesium carbonate and magnesium oxide whisker from magnesite
  • Method and apparatus for production of basic magnesium carbonate and magnesium oxide whisker from magnesite

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preparation example Construction

[0037] Preferred preparation steps of the present invention include:

[0038] 1) Calcination: Calcining magnesite into light-burned ore, the temperature of the preheating section of the calcination kiln is controlled at 150-200°C, the temperature of the calcination section is controlled at 700-900°C, the temperature of the cooling section is controlled at 100-150°C, and the calcination time is 24 -32 hours, cooked ore activity ≤ 200S.

[0039] 2) Powder: The above cooked ore powder is made into 120 mesh 90% lightly burned powder, and its MgO content is measured, which requires more than 82%.

[0040] 3) Carbonization: Mix the ore powder and water into the tank according to the ratio of MgO13-17g / L, and send the CO2 (kiln gas) produced by the kiln calcined magnesite to the carbonization tank for carbonization after cooling, dust removal and pressurization. The end point is that the soluble MgO in the solution reaches 11-15g / L.

[0041] 4) Filter residue: Send the above-mentio...

Embodiment 2

[0051] In embodiment 2 of the present invention, the magnesite is broken into 13-16 cm size ore pieces and anthracite coal pieces (calorific value 21000 joules / kg) are added to the calcining kiln at a ratio of 10:1, and the calcining temperature is controlled at 800-830 degrees The calcination time is 27 hours, and the smelted ore powder reaches 120 mesh and 90% passes through, and the magnesium oxide content is 85.5%, and the activity is 160 seconds. Put its powder and water into the carbonization tank at a ratio of 16 g / l of magnesium oxide, and send the carbon dioxide (kiln gas) produced by the calcining kiln to the carbonization tank after cooling, dust removal, and compression. The pressure is controlled at 3-4 atmospheres, and the temperature is controlled 10-20 degrees, reaction time 1.5-2.5 hours, the measured soluble magnesium oxide is greater than 14.5 g / L. It is filtered to remove slag, and the pure liquid is commonly called heavy magnesium water, which is pumped in...

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Abstract

The invention relates to a method and apparatus for production of basic magnesium carbonate and magnesium oxide whisker from magnesite. The invention utilizes non-acidolysis and non-alkalifying of magnesite to synthesize a precursor, then calcination is carried out to obtain magnesium oxide whisker, magnesite can be utilized to automatically synthesize basic magnesium carbonate and magnesium oxide whisker. The method consists of: taking magnesite as the raw material, carrying out calcination, powdering, carbonization and deslagging on the raw material to obtain a heavy magnesium solution, resolving the heavy magnesium solution to obtain a precursor, and drying the precursor to obtain magnesium carbonate whisker. The method does not involved acid or alkali, can enable automatic synthesis of the precursor and magnesium oxide whisker from magnesite, in the future the industrialized operation can be safer, and the equipment and pipeline can realize material carbon tempering. Also the carbon dioxide and water produced in the process can be recycled, thus realizing a green process.

Description

technical field [0001] The invention belongs to the field of inorganic salt preparation, in particular to a method and equipment for synthesizing basic magnesium carbonate and magnesium oxide whiskers by using magnesite. Background technique [0002] Whisker is a single crystal fiber material with an aspect ratio greater than 10. When the whisker is crystallized, its atomic structure is arranged in an orderly manner and there are few internal defects. Therefore, its strength and modulus are close to the theoretical values ​​of a complete crystal material. It is a property Excellent reinforcing agent for composite materials. [0003] Magnesium oxide whiskers have good heat resistance, acid and alkali resistance, insulation, thermal conductivity, stability and reinforcement and toughness. The thermal conductivity is three times that of alumina, and the heat-resistant temperature is as high as 1600 ° C. The tensile strength is 980MPa, thermal conductivity 260W / M.K, can be used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/62C30B29/16C30B29/22
Inventor 李治涛张蕊
Owner 李治涛
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