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Method for preparing calcium silicate from desulfurized gypsum

A technology for desulfurizing gypsum and calcium silicate, applied in the direction of silicate, alkaline earth metal silicate, etc., can solve the problems of large storage volume and low utilization rate of sulfur-containing gypsum, reduce decomposition temperature and processing energy consumption, and reduce Requirements, the effect of mitigating potential threats

Pending Publication Date: 2022-08-09
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the present invention provides a method for preparing calcium silicate from desulfurized gypsum to solve the problem of huge storage of sulfur-containing gypsum and low utilization rate

Method used

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  • Method for preparing calcium silicate from desulfurized gypsum
  • Method for preparing calcium silicate from desulfurized gypsum
  • Method for preparing calcium silicate from desulfurized gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A kind of method for preparing calcium silicate with desulfurized gypsum

[0050] (1) Dry desulfurization gypsum and silicon carbide in a drying oven at 85°C for 18 hours in advance, mix the dried desulfurization gypsum and silicon carbide in a ratio of 3:1 by mass, put them in a ball mill and mix thoroughly for 3 hours, The speed of the ball mill is 100r / min; 5-8:2-5

[0051] (2) Add 10% water to the mixed sample to make pellets, the diameter of the pellets is 5mm-7mm, and then put the pellets into a drying oven for drying at 60°C for 20h;

[0052] (3) Put the prepared pellets into a muffle furnace for calcination in an air atmosphere, set the heating rate to 5°C / min, select a calcination temperature of 950°C, and keep the temperature at the highest temperature for 1 hour.

[0053] After testing, the desulfurization rate of the product after roasting is 67%, and the yield of calcium silicate is 69% of the theoretical value. XRD analysis of the product, the results ar...

Embodiment 2

[0055] Same as Example 1, the difference is: the desulfurized gypsum and silicon carbide are mixed in a mass ratio of 2:1.

[0056] After testing, the desulfurization rate of the calcined product is 84%, and the yield of calcium silicate is 87% of the theoretical value. XRD analysis of the product, the results are as follows image 3 shown. according to image 3 It can be seen that a large amount of CaSiO was generated in the sample 3 Phase, CaSO 4 The amount of SiC and SiC is very small, indicating that the desulfurization effect is obvious and thorough under this condition, and the addition amount of SiC is also more appropriate.

Embodiment 3

[0058] Same as Example 1, the difference is: the desulfurized gypsum and silicon carbide are mixed in a mass ratio of 1:1.

[0059] After testing, the desulfurization rate of the product after roasting is 95%, and the yield of calcium silicate is 98% of the theoretical value. XRD analysis of the product, the results are as follows Figure 4 shown. according to Figure 4 It can be seen that a large amount of CaSiO was generated in the sample 3 Phase, CaSO 4 The amount of SiC is already very small, indicating that the desulfurization effect is obvious and complete under this condition, but the addition of SiC is excessive.

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Abstract

The invention provides a method for preparing calcium silicate from desulfurized gypsum, and relates to the technical field of solid waste resourceful treatment. The preparation of calcium silicate is realized by taking desulfurized gypsum as a raw material through the steps of drying, mixing, pelletizing, roasting and the like. By utilizing silicon carbide, the decomposition temperature and treatment energy consumption of the desulfurized gypsum are remarkably reduced, meanwhile, the requirement on production equipment is reduced, calcium silicate which can be used as a building material is obtained, and efficient recovery of sulfur resources in the desulfurized gypsum is realized.

Description

technical field [0001] The invention relates to the technical field of solid waste resource treatment, in particular to a method for preparing calcium silicate from desulfurized gypsum. Background technique [0002] Desulfurized gypsum is industrially produced to remove SO from sulfur-containing waste gas. 2 The by-products produced, my country's desulfurized gypsum mainly comes from coal-fired power plants and the steel industry. In recent years, with the increasing demand for electricity and steel production in my country, the pressure to deal with sulfur-containing waste gas is also increasing. Calcium-based wet flue gas desulfurization technology (FGD) is currently one of the most widely used and one of the most economical and environmentally beneficial treatment technologies. The technology blows sulfur-containing flue gas into a lime-limestone mixture. 2 with Ca(OH) 2 Reaction and oxidation to generate calcium sulfate to obtain water-containing desulfurized gypsum, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/24
CPCC01B33/24C01P2002/72
Inventor 闫柏军苗祥周张杰邓腾飞
Owner UNIV OF SCI & TECH BEIJING
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