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Process technology for changing components of power plant gypsum under different working conditions

A process technology and gypsum technology, applied in the field of power plant gypsum, can solve the problems of low compressive, flexural and strength of cement, low quality, and many impurities in power plant gypsum, etc., and achieve the effect of improving the strength of cement

Inactive Publication Date: 2020-02-28
SICHUAN XINGCHUANCHENG CEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a process technology for changing the composition of gypsum in different working conditions of the power plant, which has the advantages of high strength and low impurities, and solves the problem that the invention simply starts dehydration and calcination after dust removal treatment. The obtained power plant gypsum has too many impurities. If it is used to replace natural gypsum to produce cement, the obtained cement will have low compression resistance, flexural resistance and strength, which is obviously a problem of low quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: A kind of process technology that different working conditions of power plant gypsum changes composition, comprises the following steps:

[0026] 1) Add 10 parts of power plant gypsum and 100 parts of water into the stirring equipment at the same time and stir for 10 minutes to obtain slurry A;

[0027] 2) Filter the slurry A in step 1) through a 200-mesh vibrating sieve to remove impurities with larger particles to obtain slurry B;

[0028] 3) Add 15 parts of the slurry B in step 2) into the acidic mixed solution and stir for 5 minutes to make the pH value less than 7, and obtain the slurry C;

[0029] 4) Add 100 parts of slurry C in step 3) to 5 parts of crystal-aiding additives and 20 parts of surfactant for mixing, then add the mixed liquid into the reactor for hydrothermal pressure reaction, and the reaction time is 1 hour Hour, obtain mixed solution A;

[0030] 5) Transfer the mixed liquid A in step 4 out of the reaction kettle, cool it naturally a...

Embodiment 2

[0033] Embodiment 2: A kind of process technology for changing the composition of gypsum in different working conditions of a power plant, comprising the following steps:

[0034] 1) Add 20 parts of power plant gypsum and 100 parts of water into the stirring equipment at the same time and stir for 15 minutes to obtain slurry A;

[0035] 2) Filter the slurry A in step 1) through a 250-mesh vibrating sieve to remove impurities with larger particles to obtain slurry B;

[0036] 3) Add 20 parts of the slurry B in step 2) into the acidic mixed solution and stir for 10 minutes, so that the pH value is less than 7, and the slurry C is obtained;

[0037] 4) Add 200 parts of the slurry C in step 3) to 10 parts of crystal-helping additives and 40 parts of surfactants for mixing, then add the mixed liquid into the reactor for hydrothermal pressure reaction, and the reaction time is 2 hours Hour, obtain mixed solution A;

[0038] 5) Transfer the mixed solution A in step 4 out of the rea...

Embodiment 3

[0041]Embodiment three: a kind of process technology that different working conditions of power plant gypsum changes composition, comprises the following steps:

[0042] 1) Add 30 parts of power plant gypsum and 100 parts of water into the stirring equipment at the same time and stir for 20 minutes to obtain slurry A;

[0043] 2) Filter the slurry A in step 1) through a 300-mesh vibrating sieve to remove impurities with larger particles to obtain slurry B;

[0044] 3) Add 25 parts of the slurry B in step 2) into the acidic mixed solution and stir for 15 minutes to make the pH value less than 7 to obtain the slurry C;

[0045] 4) Add 300 parts of slurry C in step 3) to 15 parts of crystallization additives and 60 parts of surfactant for mixing, then add the mixed liquid into the reactor for hydrothermal pressure reaction, and the reaction time is 3 hours Hour, obtain mixed solution A;

[0046] 5) Transfer the mixed solution A in step 4 out of the reaction kettle, cool it natu...

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PUM

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Abstract

The invention relates to the technical field of power plant gypsum, and discloses a process technology for changing components of power plant gypsum under different working conditions. The process technology comprises: simultaneously adding 10-30 parts of power plant gypsum and 100 parts of water into stirring equipment, and stirring for 10-20 min to obtain slurry A. According to the invention, power plant gypsum and water are mixed and stirred, and screening is performed through a vibrating sieve, so insoluble large-particle impurities can be completely filtered out; by arranging a crystallization assisting additive, the power plant gypsum in the slurry can be helped to crystallize quickly; by adding a surfactant, a hydrothermal pressing reaction can be performed by combining with a reaction kettle through the excellent washing, decontamination and emulsification functions of the surfactant, so the stains attached outside the power plant gypsum cam be separated to obtain the completeand impurity-free gypsum crystal grain; and with the process technology, the impurities of the power plant gypsum obtained through the method are almost completely removed, the strength of the produced cement is substantially improved, and the purposes of high strength and low impurity are achieved.

Description

technical field [0001] The invention relates to the technical field of power plant gypsum, in particular to a technology for changing the composition of power plant gypsum under different working conditions. Background technique [0002] Gypsum in power plants is calcium sulfate dihydrate, also called desulfurization gypsum, which is oxidized by the reaction of sulfur dioxide in coal-fired flue gas and calcium hydroxide as a desulfurizing agent. It can generally be used to replace natural gypsum to produce cement. Currently, power plant gypsum is used to produce cement It is limited to replace natural gypsum to reduce production costs, but the influence of different components of gypsum on the strength and performance of cement has never been involved in the production of cement. [0003] Existing power plant gypsum production processes are different. For example, Chinese patent CN 103274615 B discloses a desulfurization gypsum drying and calcination production process. This...

Claims

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Application Information

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IPC IPC(8): C04B7/28C04B7/24C04B7/26C04B7/21C04B7/19C04B7/36C04B11/26
CPCC04B7/19C04B7/21C04B7/24C04B7/26C04B7/28C04B7/36C04B11/005C04B11/26Y02P40/10
Inventor 邹波潘波汤戈
Owner SICHUAN XINGCHUANCHENG CEMENT CO LTD
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