Process for preparing high purity gypsum by using waste industrial carbide slag slurry

A technology of slag slurry and calcium carbide, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of many impurities and achieve the effect of improving product quality

Inactive Publication Date: 2007-08-01
TAIYUAN NO 1 THERMAL PLANT CHINA GUODIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] After a large number of experiments, the present invention has obtained a large amount of data on the difference in physical properties between gypsum and other impurities. On this basis, the physical properties of gypsum are used to skillfully solve the numerous impurities in calcium carbide slag slurry and desulfurized products. Due to the problem that conventional methods cannot be used for separation and purification to produce gypsum with higher purity, the recycling of calcium carbide slag slurry and flue gas desulfurization are unified in the production process of gypsum, which realizes the innovation of production technology and uses the method of the present invention to produce The purity of the gypsum can reach more than 90%, which not only achieves the purpose of recycling waste and making the best use of everything, but also improves product quality, and realizes a win-win situation of economic and social effects. The application of the present invention will definitely benefit my country's Environmental protection and the adjustment and transformation of traditional industries, and then achieve a positive impact on sustainable development strategies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Example 1: A process for producing high-purity gypsum using industrial waste calcium carbide slag slurry, including raw material pretreatment process, flue gas desulfurization process, swirling flow optimization process, and dehydration process, wherein, in the raw material pretreatment process, select Carbide slag slurry with a solid content of 15%, then use conventional methods to concentrate the solid content to 20%, and simultaneously make the Ca(OH) in the solid 2 The concentration is 80%; in the flue gas desulfurization process, select the desulfurized sulfur-containing slurry with a solid content of 20%, and use conventional methods to make the concentration of gypsum in the solids 90%; in the swirl optimization process, use The cyclone separator separates the solid matter with a specific gravity of 2 and a particle size of 30um from the sulfur-containing slurry; and then uses conventional methods to dehydrate the separated solid matter, which is the finished prod...

Embodiment 2

[0008] Example 2: A process for producing high-purity gypsum using industrial waste calcium carbide slag slurry, including raw material pretreatment process, flue gas desulfurization process, swirling flow optimization process, and dehydration process, wherein, in the raw material pretreatment process, select Solid content is 18% calcium carbide slag slurry, utilizes conventional method then the content of solid content is concentrated to 30%, simultaneously makes the Ca(OH) in the circle 2 The concentration is 85%; in the flue gas desulfurization process, select the desulfurized sulfur-containing slurry with a solid content of 30%, and use conventional methods to make the concentration of gypsum in the solids 96%; in the swirl optimization process, use The cyclone separator separates the solid matter with a specific gravity of 2.9 and a particle size of 104 μm from the sulfur-containing slurry; then dehydrates the separated solid matter by conventional methods to obtain the fi...

Embodiment 3

[0009] Example 3: A process for producing high-purity gypsum using industrial waste calcium carbide slag slurry, including raw material pretreatment process, flue gas desulfurization process, swirling flow optimization process, and dehydration process, wherein, in the raw material pretreatment process, select Solids content is 16.5% calcium carbide slag slurry, utilizes conventional method then the content of solids is concentrated to 25%, simultaneously makes the Ca(OH) in solids 2 The concentration is 82%; in the flue gas desulfurization process, select the desulfurized sulfur-containing slurry with a solid content of 25%, and use conventional methods to make the concentration of gypsum in the solids 93%; in the swirl optimization process, use The cyclone separator separates the solid matter with a specific gravity of 2.4 and a particle size of 72 μm from the sulfur-containing slurry; and then uses conventional methods to dehydrate the separated solid matter, which is the fin...

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PUM

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Abstract

The present invention relates to gypsum production, and is especially the technological process of producing high purity gypsum with waste industrial tourmaline slag slurry. The technological process includes the steps of material pre-treatment, fume desulfurizing, cyclonic sorting, and dewatering. The present invention can produce gypsum with purity over 90 %, and the present invention uses waste in producing high quality product and is favorable to environment protection.

Description

technical field [0001] The invention relates to a method for producing gypsum, in particular to a method for producing high-purity gypsum by using discarded carbide slag slurry, specifically a process for producing high-purity gypsum by using industrially discarded carbide slag slurry. Background technique [0002] At present, there are many ways to recycle the discarded calcium carbide slag slurry in calcium carbide plants, because the Ca(OH) contained in it 2 The concentration of CaSO is relatively high, so it is often recycled as raw material for flue gas desulfurization, and the CaSO contained in the sulfur-containing slurry after desulfurization 4 The concentration of calcium carbide slag is relatively high, so people have always wanted to use the desulfurized sulfur-containing slurry to produce gypsum to achieve the purpose of making the best use of everything. However, due to the many impurities in the calcium carbide slag slurry and desulfurized products, some impuri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46C04B11/05
Inventor 卫泳波薛维汉郝强
Owner TAIYUAN NO 1 THERMAL PLANT CHINA GUODIAN
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