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Production method of light calcined magnesia

A light-burning magnesia and production method technology, applied in the field of metallurgy, can solve the problems of unacceptable production enterprises, large investment in recycling equipment, unstable exhaust gas flow, etc., and achieve the effects of easy control, improved quality, and efficient and low-cost recovery.

Active Publication Date: 2017-08-04
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small scale of the single kiln of the reverberatory kiln, the exhaust gas flow is extremely unstable, and the exhaust gas is not easy to collect, especially the large amount of exhaust gas, of which CO 2 The gas concentration is l

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Transport the raw material of magnesite with particle size of 0-30mm to the rotary microwave roaster and mix evenly with recrystallized silicon carbide balls with particle size of 20-50mm placed in the roaster cavity; the mass percentage of magnesite 30%, and the mass percentage of recrystallized silicon carbide balls is 70%.

[0030] (2) The rotary microwave roasting furnace uses microwaves generated by industrial microwave sources with a frequency of 915MHZ as the heat source, and recrystallized silicon carbide balls are used as microwave coupling agents to effectively couple with microwaves, and the temperature is raised to 750°C in 10 minutes.

[0031] (3) Under the action of coupling agent, magnesite is indirectly heated to 700°C for decomposition reaction and calcined into light-calcined magnesia, and at the same time generates CO with a concentration of 90% to 98%. 2 .

[0032] (4) During the calcination process, with the rotation of the calcination furnace,...

Embodiment 2

[0035](1) Transport the magnesite raw material with particle size of 0-30mm to the rotary microwave roasting furnace and mix evenly with recrystallized silicon carbide balls with particle size of 30-80mm placed in the roasting furnace cavity; the mass percentage of magnesite The mass percentage of recrystallized silicon carbide balls is 65%.

[0036] (2) The rotary microwave roasting furnace uses microwaves generated by industrial microwave sources with a frequency of 2450MHZ as the heat source. Recrystallized silicon carbide spheres are effectively coupled with microwaves as a microwave coupling agent, and the temperature is raised to 900 °C in 15 minutes.

[0037] (3) Under the action of coupling agent, magnesite is indirectly heated to 850°C for decomposition reaction and calcined into light-burned magnesia, and at the same time generates CO with a concentration of 90% to 98%. 2 .

[0038] (4) During the calcination process, with the rotation of the calcination furnace, t...

Embodiment 3

[0041] (1) Transport the magnesite raw material with a particle size of 0-30mm to the rotary microwave roaster and mix it evenly with the recrystallized silicon carbide balls with a particle size of 40-100mm placed in the roaster cavity; the mass percentage of magnesite 40%, and the mass percentage of recrystallized silicon carbide balls is 60%.

[0042] (2) The rotary microwave roasting furnace uses microwaves generated by industrial microwave sources with a frequency of 915MHZ as the heat source. The recrystallized silicon carbide spheres are effectively coupled with microwaves as a microwave coupling agent, and the temperature is raised to 950°C in 18 minutes.

[0043] (3) Under the action of coupling agent, magnesite is indirectly heated to 900°C for decomposition reaction and calcined into light-burned magnesia, and at the same time generates CO with a concentration of 90% to 95%. 2 .

[0044] (4) During the calcination process, with the rotation of the calcination furn...

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Abstract

The invention relates to the technical field of metallurgy and particularly relates to a production method of light calcined magnesia. The production method of the light calcined magnesia comprises the following steps: by adopting magnesite of which the particle size is smaller than 30mm as a raw material, conveying the magnesite to a rotary microwave roaster and mixing with recrystallized silicon carbide spheres; indirectly heating the magnesite to produce the light calcined magnesia by adopting the recrystallized silicon carbide spheres as a microwave coupling agent; grinding the recrystallized silicon carbide spheres into high-activity light calcined magnesia powder by the coupling agent while burning and decomposing the magnesite into the light calcined magnesia, and efficiently recycling a high-concentration CO2 gas generated by decomposing magnesium carbonate at low cost. Resources which cannot be processed by an existing process are effectively utilized; the magnesite is ground into the high-activity light calcined magnesia while being burnt and decomposed into the light calcined magnesia, so that the activity of a product is improved, the quality of the product is improved, the crushing link is omitted, the process is simplified, and the production process is easy to control. By adopting the method of heating and burning the magnesite through nonfuel combustion, high-efficiency and low-cost recovery of CO2 is achieved and the environmental pollution is reduced.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for producing light-burned magnesium oxide. Background technique [0002] Magnesite is one of my country's advantageous mineral resources, with a total reserve of more than 3 billion tons, accounting for a quarter of the world's magnesite reserves and ranking first in the world. Light-burned magnesia powder calcined from magnesite is an indispensable mineral raw material in the fields of metallurgy, refractory materials, building materials, chemicals, papermaking, rubber, plastics, coatings, medicine, fertilizers, etc., and its development and application are developing rapidly and becoming more and more extensive. [0003] At present, the production of active light-burned magnesia from magnesite in my country generally adopts reverberatory kiln calcination, and the production process has a history of 70-80 years. The magnesite ore is added from the roof of the rever...

Claims

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Application Information

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IPC IPC(8): C04B2/10
CPCC04B2/10Y02P40/40
Inventor 郭玉香曲殿利彭强王春新
Owner UNIV OF SCI & TECH LIAONING
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