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Method for producing calcite based on gypsum wastes

A technology for producing calcite and gypsum, which is applied in the field of calcite, can solve problems such as environmental pollution and lower reuse rate, and achieve the effect of solving environmental pollution and protecting the environment

Inactive Publication Date: 2017-12-22
QINGYANG COUNTY YONGCHENG CALCIUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fuel gas desulfurization gypsum emitted from coal-fired thermal power plants is a by-product, about 80% to 90% of which is sold, but as coal-fired thermal power plants continue to increase and most of the chemical gypsum from fertilizer production companies is deposited in the wild, its reuse Unavoidable decrease in utilization rate, which leads to environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A method for producing calcite based on gypsum waste, comprising the following steps: pulverizing the gypsum waste with a pulverizer, then adding 30 times the volume of water, stirring for 5 hours at a speed of 800r / min, and then filtering with a sieve plate, Remove water and dry the liquid gypsum; grind the dried gypsum with a grinder to obtain gypsum powder, mix the gypsum powder with 8 times the amount of water and lye, and stir it evenly with a mixer to obtain a slurry, which is sent to the manufacturing Carbon dioxide is passed into the obtained slurry for carbonation reaction, wherein the initial reaction temperature of the slurry is 12° C., and the concentration of gypsum in the slurry is 3 g / cm 3 .

[0014] Further, the volume of the water and the lye is 3:1.

[0015] Further said lye is 30% ammonia water by mass percentage.

[0016] Further, the flow rate of introducing carbon dioxide is 80m 3 / min.

[0017] The calcite prepared by the method of the present...

Embodiment 2

[0019] A method for producing calcite based on gypsum waste, comprising the following steps: pulverizing the gypsum waste with a pulverizer, then adding 20 times the volume of water, stirring for 3 hours at a speed of 500r / min, and then filtering with a sieve plate, Remove water and dry the liquid gypsum; grind the dried gypsum with a grinder to obtain gypsum powder, mix the gypsum powder with 5 times the amount of water and lye, and stir it evenly with a mixer to obtain a slurry, which is sent to the manufacturing Carbon dioxide is passed into the obtained slurry for carbonation reaction, wherein the initial reaction temperature of the slurry is 10° C., and the concentration of gypsum in the slurry is 1 g / cm 3 .

[0020] Further, the volume of water and lye is 2:1.

[0021] Further said lye is 20% ammonia water by mass percentage.

[0022] Further, the flow rate of introducing carbon dioxide is 5m 3 / min.

[0023] The calcite prepared by the method of the present inventio...

Embodiment 3

[0025] A method for producing calcite based on gypsum waste, comprising the following steps: pulverizing the gypsum waste with a pulverizer, then adding 50 times the volume of water, stirring for 6 hours at a speed of 1000r / min, and then filtering with a sieve plate, Remove water and dry the liquid gypsum; grind the dried gypsum with a grinder to obtain gypsum powder, mix the gypsum powder with 10 times the amount of water and lye, and stir it evenly with a mixer to obtain a slurry, which is sent to the manufacturing Carbon dioxide is passed into the obtained slurry for carbonation reaction, wherein the initial reaction temperature of the slurry is 25°C, and the concentration of gypsum in the slurry is 5g / cm 3 .

[0026] Further, the volume of the water and the lye is 4:1.

[0027] Further said lye is 50% ammonia water by mass percentage.

[0028] Further, the flow rate of introducing carbon dioxide is 10m 3 / min.

[0029] The calcite prepared by the method of the present ...

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PUM

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Abstract

The invention provides a method for producing calcite based on gypsum wastes. The method comprises the following steps: crushing gypsum wastes by using a crusher, then, adding water with the volume being 20-50 times as large as that of the gypsum wastes, and drying liquid gypsum; grinding the dried gypsum by using a grinder to obtain gypsum powder; mixing the gypsum powder with water and an alkaline liquid with volumes being 5-10 times as large as that of the gypsum powder; uniformly stirring the mixture by using a stirring machine to obtain slurry; and introducing carbon dioxide to the prepared slurry to carry out carbonation reaction. The waste gypsum is used as a raw material, so that the reusing effect of the recycled waste resource can be achieved, meanwhile, the environment is protected, and the problem of environment pollution is basically solved. In other words, the economic method for producing and recycling calcite with high purity of at least 95% and ammonium sulfate with high purity by using waste gypsum can be developed. In addition, the calcite with the purity of about 99% can be recycled when the pretreated waste gypsum is subjected to carbonation reaction.

Description

technical field [0001] The invention belongs to the technical field of calcite, and in particular relates to a method for producing calcite based on gypsum waste. Background technique [0002] Spent gypsum, which takes the form of dihydrate gypsum and is generally called chemical gypsum, discharges 400,000 tons of spent gypsum every year from domestic industries that use sulfuric acid or generate sulfuric acid as waste. The reuse of gypsum is dependent on the purity of the gypsum and gypsum with a purity of at least 94% is currently available in gypsum board, plaster, etc., but chemical gypsum is currently being produced in excess of the needs of the gypsum industry. Fuel gas desulfurization gypsum emitted from coal-fired thermal power plants is a by-product, about 80% to 90% of which is sold, but as coal-fired thermal power plants continue to increase and most of the chemical gypsum from fertilizer production companies is deposited in the wild, its reuse The utilization ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18C01C1/245
CPCC01F11/181C01C1/245C01P2006/80
Inventor 陈永忠
Owner QINGYANG COUNTY YONGCHENG CALCIUM IND