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A kind of method that utilizes the tail gas of clinker kiln to carry out carbonation decomposition

A technology of carbonation decomposition and clinker kiln, which is applied in chemical instruments and methods, preparation of alkali metal aluminate/alumina/aluminum hydroxide, inorganic chemistry, etc., and can solve problems such as greenhouse effect, resource waste, and environmental hazards , to achieve the effect of improving resource utilization efficiency

Inactive Publication Date: 2015-09-02
NORTHEASTERN UNIV LIAONING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A lot of CO 2 The emission of gas not only brings great harm to the environment, causes serious greenhouse effect, but also brings great waste of resources

Method used

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  • A kind of method that utilizes the tail gas of clinker kiln to carry out carbonation decomposition
  • A kind of method that utilizes the tail gas of clinker kiln to carry out carbonation decomposition

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Embodiment 1

[0026] A method of utilizing clinker kiln tail gas to carry out carbonation decomposition, the specific method is as follows:

[0027] 1) Will contain 12% CO by volume 2 After the clinker kiln exhaust gas passes through the vertical flue to remove dust, the exhaust gas pressure is -50Pa, the temperature is 200°C, and the dust content is 200×10 3 mg / m 3 ;

[0028] 2) After the tail gas treated in step 1) is dedusted by the cyclone dust collector, the pressure of the tail gas is -280Pa, the temperature is 180°C, and the dust content is 19.3×10 3 mg / m 3 ;

[0029] 3) After the tail gas treated in step 2) is dusted by an electrostatic precipitator, the pressure of the tail gas is -680Pa, the temperature is 150°C, and the dust content is 50mg / m 3 ;

[0030] 4) After the tail gas treated in step 3) is washed with water, the pressure of the tail gas is 1.01×10 5 Pa, temperature is 10°C, dust content is 10mg / m 3 ;

[0031] 5) After the exhaust gas after the water washing trea...

Embodiment 2

[0035] A method of utilizing clinker kiln tail gas to carry out carbonation decomposition, the specific method is as follows:

[0036] 1) Will contain 14% CO by volume 2 After the clinker kiln exhaust gas passes through the vertical flue to remove dust, the exhaust gas pressure is -250Pa, the temperature is 265°C, and the dust content is 250×10 3 mg / m 3 ;

[0037] 2) After the tail gas treated in step 1) is dedusted by the cyclone dust collector, the pressure of the tail gas is -420Pa, the temperature is 230°C, and the dust content is 25.6×10 3 mg / m 3 ;

[0038]3) After the tail gas treated in step 2) is dusted by an electrostatic precipitator, the pressure of the tail gas is -850Pa, the temperature is 200°C, and the dust content is 100mg / m 3 ;

[0039] 4) After washing the exhaust gas treated in step 3), the exhaust gas pressure is 1.01×10 5 Pa, temperature is 40°C, dust content is 30mg / m 3 ;

[0040] 5) After the exhaust gas after the water washing treatment is pres...

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Abstract

The invention provides a method for carbonation decomposition with clinker kiln tail gas. The method comprises the following steps: preprocessing of dust extraction and wash is performed to the clinker kiln tail gas in sequence and CO2 gas is collected; the obtained CO2 gas is pressed and added in feed liquid containing sodium aluminate for primary carbonation decomposing until the potential of hydrogen (pH) of the feed liquid is 9.7-10.6 and solid-liquid separation is performed to the feed liquid after the primary carbonation decomposing; and the pressed CO2 gas obtained by the preprocessing is added continuously to filtrate after the primary carbonation decomposing for secondary carbonation decomposing until the pH of the feed liquid is 9.0-9.8 and precipitate is collected. According to the method for the carbonation decomposing with the clinker kiln tail gas, the secondary carbonation decomposing is performed to sodium aluminate solution obtained by comprehensive utilization of the clinker kiln tail gas to high-alumina fly ash so that the problem of pollution caused by clinker kiln tail gas discharged into environment and greenhouse effect caused by the clinker kiln tail gas discharged into the air in large amount can be solved. Meanwhile aluminum and gallium in the sodium aluminate solution is comprehensively recovered and resource use efficiency is further improved.

Description

technical field [0001] The invention relates to a method for carbonation and decomposition of clinker kiln tail gas, which belongs to the field of comprehensive utilization of fly ash to produce alumina and comprehensive utilization of waste gas. Background technique [0002] Due to the special geological background, the Late Paleozoic coal seams and gangue in the Ordos Basin in my country are rich in aluminum-rich minerals such as kaolinite and boehmite, and the alumina content in the coal ash composition exceeds 40%. Valence elements have very important development and utilization value. The proven geological reserves of high-alumina coal in Jungar Coalfield alone are 26.76 billion tons, the alumina content in coal is 10-13%, and the potential reserves of high-alumina fly ash reach 7 billion tons, which is equivalent to the reserved reserves of bauxite in my country 3 times of that; gallium reserves are 860,000 tons, accounting for more than 80% of the world's proven reserv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/14C01G15/00
Inventor 闫绍勇张先奇张廷安辛卫东吕国志张成伟王利娟赵大虎杜晓荣
Owner NORTHEASTERN UNIV LIAONING