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Light calcium carbonate suspension calcining process

A light calcium carbonate, suspension calcination technology, applied in the chemical industry, sustainable manufacturing/processing, calcium/strontium/barium oxide/hydroxide, etc., can solve high energy consumption, long warm-up time, high cost, etc. problems, to achieve the effects of low energy consumption, fast calcination decomposition reaction, and increased added value

Active Publication Date: 2014-12-03
石棉县亿欣钙业有限责任公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

But this method has long warm-up time, high cost and high energy consumption

Method used

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  • Light calcium carbonate suspension calcining process
  • Light calcium carbonate suspension calcining process
  • Light calcium carbonate suspension calcining process

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Embodiment

[0041] The calcium carbonate raw material used in the embodiment is the tailings produced by the production and classification of heavy calcium carbonate, which is hereinafter referred to as tailings.

[0042] Preheating process: use the high temperature gas generated in the calcination process to reduce the particle size D97 = 40μm~55μm tailings are preheated to 300℃~450℃ by primary suspension; then preheated to 450℃~800℃ by secondary suspension; finally preheated to 800℃~950℃ by tertiary suspension; The preheating pressure is -3500Pa~-4500Pa, the secondary suspension preheating pressure is -3000Pa~-3500Pa, and the tertiary suspension preheating pressure is -2800Pa~-3200Pa;

[0043] Calcination process: the tailings after the preheating process are suspended and calcined at a temperature of 1000°C to 1100°C and a pressure of -2500Pa to -3000Pa to obtain calcium oxide and high-temperature gas. There is a large amount of calcium oxide dust entrained in the high-temperature gas ...

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Abstract

The invention belongs to the field of calcium carbonate production, in particular to a light calcium carbonate suspension calcining process, and aims to provide a light calcium carbonate suspension calcining process with low energy consumption. To solve the technical problem, the invention adopts the technical scheme which comprises procedures of preheating, calcining and carbonization; in the preheating procedure, a calcium carbonate raw material of which the particle size D80 is 40-55mu m is preheated to 800-950 DEG C by using a high-temperature gas generated in the calcining procedure; and in the calcining procedure, suspension calcining is performed on the preheated calcium carbonate raw material at 1000-1100 DEG C so as to obtain calcium oxide and the high-temperature gas. The process sufficiently utilizes the heat energy generated in the calcining procedure and the heat energy is used for preheating the raw material and the air; therefore, the waste heat discharge amount is reduced, the energy is saved; in addition, the calcium carbonate decomposition rate of the suspension calcining procedure is as high as 99%.

Description

technical field [0001] The invention belongs to the field of calcium carbonate production, and in particular relates to a light calcium carbonate calcining process. Background technique [0002] The traditional light calcium carbonate calcined lime process makes limestone with a particle size of 40-80mm, and puts it into the kiln to be calcined into calcium oxide according to the coal ratio of 1:7. The kiln types include earth kiln, mechanical lime kiln, steel shell kiln, etc. This process is relatively backward at present, and the main disadvantages are that the degree of mechanization and automation is not high, the production scale is small, the energy consumption is high, the dust, waste gas and solid waste are difficult to handle, and it is not friendly to the environment. [0003] Chinese invention patent CN201210193265.9 discloses a method for producing light calcium carbonate by using calcite. The specific steps are: select calcite with CaO > 54%, and use gas fuel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/06
CPCY02P20/10Y02P20/129
Inventor 彭贵明陈华平雷礼强徐霞王晓洪周德忠
Owner 石棉县亿欣钙业有限责任公司
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