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A method for preparing light-burned magnesia by a magnesite cracking method

A technology of lightly burning magnesia and magnesite, which is applied in chemical instruments and methods, inorganic chemistry, energy input, etc., and can solve problems such as limited sales, waste of resources, and limited carbon dioxide

Active Publication Date: 2021-11-30
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the reflective kiln (shaft kiln) has been ordered to process light-burned magnesia, so the technology of swirling flash-roasted magnesia powder has been gradually adopted. Because this technology meets the requirements of environmental protection and has a large production capacity, it is blooming everywhere like bamboo shoots after a rain, and enterprises have launched one after another. The production equipment, however, still does not consider the use or emission of carbon dioxide. It should be known that the carbon dioxide released by magnesite cracking plus the carbon dioxide released by fuel combustion produces about 4.6 tons of carbon dioxide per ton of magnesium oxide powder, which is a large amount of carbon dioxide emissions. , not only causing air pollution, increasing the greenhouse gas effect, but also wasting resources
[0006] Decomposition of magnesite by electric heating shaft kiln technology, and natural gas external heating rotary kiln technology have begun to decompose magnesite. However, the use of carbon dioxide has been reported to be made into dry ice, but the sales volume is limited, and the carbon dioxide produced by digestion limited, and the waste heat recovery and utilization of magnesium oxide powder is not clear. Moreover, the two processing technologies still have problems such as long processing time and intermittent production.

Method used

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  • A method for preparing light-burned magnesia by a magnesite cracking method
  • A method for preparing light-burned magnesia by a magnesite cracking method

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Embodiment approach

[0034] (1) Fill 2Kg of magnesite powder (200 mesh) in a fluidized bed with a diameter of 230mm, start the electric heating device, raise the temperature, feed in electrically heated carbon dioxide gas, and stabilize the fluidization until the temperature of the fluidized bed reaches 1000°C .

[0035] (2) After the magnesite powder is cracked, the magnesium oxide powder and carbon dioxide enter the cyclone separator with the airflow, the outlet temperature of the carbon dioxide is 750°C-850°C, and the temperature of the magnesium oxide powder is 800-900°C.

[0036] (3) The molar ratio of carbon dioxide gas and methane is 0.7-1.2, under the condition of cerium oxide catalyst supported by magnesium aluminum spinel, to prepare synthesis gas, and the gas production ratio is about 70-80%.

[0037] (4) Magnesium oxide powder enters the silo and exchanges heat with the air in the jacket in the rotary heat exchanger. The outlet air temperature can reach 375-425°C. It is introduced into...

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Abstract

A method for preparing light-burned magnesia by cracking magnesite, relates to a method for preparing light-burned magnesia. In the first step of the method, magnesite powder (200 mesh) is preheated by a rotary preheater, and then processed The silo and material legs evenly enter the fluidized bed; the second step is that the magnesite powder is suspended in the high temperature (900°C-1200°C) carbon dioxide gas flow (residence time 5s-9s) and cracked to generate magnesium oxide powder and carbon dioxide gas; the second step The magnesium oxide powder and carbon dioxide gas generated in the three steps enter the cyclone separator to realize the separation of magnesium oxide powder and carbon dioxide; in the fourth step, the high temperature magnesium oxide powder settles to the silo, and is cooled by a heat exchanger to obtain lightly burned magnesium oxide powder; In the fifth step, part of the high-temperature and high-purity carbon dioxide is circulated as a fluidized gas, which is mainly coupled with methane to generate synthesis gas and methanol; in the sixth step, air and high-temperature magnesium oxide powder are exchanged through a rotary jacket heat exchanger. After heating, it is used for preheating magnesite powder to realize waste heat utilization.

Description

technical field [0001] The invention relates to a method for preparing light-burned magnesia, in particular to a method for preparing light-burned magnesia by cracking magnesite. Background technique [0002] Since 2015, with the increasingly stringent requirements of the national environmental protection policy, the magnesite processing industry in Haicheng, Liaoning Province, etc. has entered a period of industrial transformation and adjustment, and the magnesite processing industry has stopped production one after another, which has caused a huge impact on the refractory industry , the phenomenon of "Luoyang paper is expensive" once appeared, and the prices of various magnesite products rose sharply. [0003] Light-burned magnesia is an indispensable raw material for refractory materials such as dead-burned magnesia, fused magnesia, and magnesium refractory. For a long time, in order to obtain magnesia powder, only a simple mixture of coal and magnesite was used. Put it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B2/10C01B3/38
CPCC01B3/38C01B2203/0238C01B2203/06C01B2203/061C01B2203/1041C01B2203/1082C04B2/102C04B2/106Y02P20/129
Inventor 王国胜齐飞奚洋谢英鹏聂鑫孟召宾
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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