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Method for preparing calcium carbonate and recycling CO by collecting and mineralizing CO2 in aluminum electrolysis flue gas

A technology of calcium carbonate and aluminum electrolysis, applied in the field of metallurgy, can solve the problems of expensive capture treatment, high investment cost and complex process.

Active Publication Date: 2015-02-25
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For the existing CO in the existing technology 2 Tail gas capture and treatment is expensive, investment cost is high, and carbide slag comprehensive utilization costs are high, energy consumption is high, pollution is large, and the process is complicated. The present invention provides a method for capturing CO in mineralized aluminum electrolysis flue gas 2 The method of preparing calcium carbonate and recovering CO, that is, using calcium carbide slag slurry as a carbon fixation agent to mineralize and countercurrent absorb CO in aluminum electrolysis to purify flue gas 2 Calcium carbonate is prepared, and CO gas is recovered at the same time, the purpose is to realize CO in aluminum electrolysis flue gas 2 Green high-value mineralization and CO efficient recovery, and green high-value comprehensive utilization of carbide slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of calcium-containing aqueous solution:

[0030]Add calcium carbide slag slurry with a solid mass concentration of 5% produced in the PVC production process into the slurry tank, control the temperature at 20°C, and add water to dilute it under the stirring condition of 1000rpm to obtain a slurry with a pH value of 12 and a calcium ion concentration of 1.0 / L. Calcium-containing aqueous solution;

[0031] (2) CO 2 Mineralization absorption reaction of flue gas and calcium-containing aqueous solution:

[0032] Send the high-calcium aqueous solution prepared in step (1) into the jet-type fully mixed reactor through a booster pump, the injection pressure of the calcium-containing aqueous solution is 1MPa, and the flow rate is 50m 3 / h, at the same time, the flue gas produced by aluminum electrolysis enters the jet-type fully mixed reactor from the gas inlet of the ejector. absorption reaction to obtain calcium carbonate pulp, and the final unabsorbed tail...

Embodiment 2

[0038] (1) Preparation of calcium-containing aqueous solution:

[0039] Add calcium carbide slurry with a solid mass concentration of 10% produced in the PVC production process into the slurry tank, control the temperature at 40°C, and add water to dilute it under the stirring condition of 500rpm to obtain a slurry with a pH value of 13 and a calcium ion concentration of 1.5 / L. Calcium-containing aqueous solution;

[0040] (2) CO 2 Mineralization absorption reaction of flue gas and calcium-containing aqueous solution:

[0041] Send the high-calcium aqueous solution prepared in step (1) into the jet-type fully mixed reactor through a booster pump, the injection pressure of the calcium-containing aqueous solution is 0.5MPa, and the flow rate is 150m 3 / h, at the same time, the flue gas produced by aluminum electrolysis enters the jet-type fully mixed reactor from the gas inlet of the ejector. absorption reaction to obtain calcium carbonate pulp, and the final unabsorbed tail ...

Embodiment 3

[0047] (1) Preparation of calcium-containing aqueous solution:

[0048] Add calcium carbide slurry with a solid mass concentration of 15% produced in the PVC production process into the slurry tank, control the temperature at 90°C, and dilute with water under the stirring condition of 150rpm to obtain a pH value of 14 and a calcium ion concentration of 1.8g / L calcium-containing aqueous solution;

[0049] (2) CO 2 Mineralization absorption reaction of flue gas and calcium-containing aqueous solution:

[0050] Send the high-calcium aqueous solution prepared in step (1) into the jet-type fully mixed reactor through a booster pump, the injection pressure of the calcium-containing aqueous solution is 2MPa, and the flow rate is 350m 3 / h, at the same time, the flue gas produced by aluminum electrolysis enters the jet-type fully mixed reactor from the gas inlet of the ejector, the injection pressure is 1.0 MPa, and the flow rate is 900kg / h. absorption reaction to obtain calcium ca...

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Abstract

The invention belongs to the field of metallurgical technology, and particularly relates to a method for capturing CO2 in mineralized aluminum electrolysis flue gas to prepare calcium carbonate and recovering CO. The method of the present invention first uses calcium carbide slag slurry to prepare a calcium-containing aqueous solution, sends it into a jet type fully mixed reactor, and performs a gas-liquid two-phase mineralization absorption reaction with the flue gas generated by aluminum electrolysis to obtain calcium carbonate slurry. In the pressure adsorption process, the escaped CO tail gas is separated and purified to obtain pure CO gas, which is liquefied under pressure to obtain CO fuel. The obtained calcium carbonate slurry is filtered and separated to obtain calcium carbonate products and filtered clear liquid. The filtered clear liquid is directly returned to the slurry tank. When recycled, the purity of the obtained calcium carbonate product is greater than 98.0% and the whiteness is greater than 85.0%. In the present invention, waste carbide slurry is used as a mineralized absorbent for CO2 in aluminum electrolysis flue gas, which solves the pollution problem of waste carbide slurry in the PVC industry and also solves the low-cost and efficient capture of CO2 greenhouse effect gas in the aluminum electrolysis process. Collection and mineralization storage issues.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for capturing CO in mineralized aluminum electrolysis flue gas 2 Preparation of calcium carbonate and recovery of CO method. Background technique [0002] A lot of CO 2 The global "greenhouse effect" caused by gas emissions and a series of serious environmental problems have attracted great attention from all countries in the world, and have taken it as the focus of greenhouse gas reduction and control. According to the forecast of the International Energy Agency, in 2030 China's energy-related CO 2 Emissions (carbon equivalent) will rise to 11.615 billion tons, accounting for 48.6% of the new increase in global carbon emissions (11.4 billion tons of carbon equivalent) during the period from 2007 to 2030. [0003] Currently, CO 2 Tail gas recovery methods mainly include absorption separation and adsorption separation. Among them, the absorption separation technol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/62B01D53/96C01B31/18C01F11/18B01D53/047C01B32/40
CPCY02A50/20Y02P20/151
Inventor 张廷安豆志河刘燕吕国志赵秋月张子木赵洪亮蒋孝丽
Owner NORTHEASTERN UNIV LIAONING