Method for synthesizing calcium carbonate from desulfurized gypsum through solid-phase grinding

A desulfurization gypsum and solid-phase grinding technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of solvent waste, high energy consumption cost, cumbersome process, etc., and achieve the effects of reducing solvent waste, good crystallinity, and high purity

Inactive Publication Date: 2021-06-25
ZHEJIANG ZHENENG TECHN RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods can successfully convert desulfurized gypsum into calcium carbonate, but it is not difficult to find that the synthesis process of these methods is carried out in a liquid phase system, which will cause a lot of solvent waste
On the other hand, the synthesis process sometimes requires heating, stirring, step-by-step feeding, etc., the process is relatively cumbersome, and the energy cost is relatively high

Method used

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  • Method for synthesizing calcium carbonate from desulfurized gypsum through solid-phase grinding
  • Method for synthesizing calcium carbonate from desulfurized gypsum through solid-phase grinding
  • Method for synthesizing calcium carbonate from desulfurized gypsum through solid-phase grinding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 5g of desulfurized gypsum, assuming its main component is CaSO 4 2H 2 O mass fraction is 90%, reactant CaSO 4 2H 2 The molar ratio of O to sodium carbonate was 0.80 for feeding. The solid raw materials are weighed and poured into a mortar, fully ground and mixed for 40 minutes. The reaction product was ground, washed with deionized water, filtered to remove soluble salts, and the remaining solid was dried in hot air at 70°C to obtain the final product fine powder calcium carbonate.

[0027] The XRD characterization results of the raw material desulfurized gypsum are as follows: figure 1 As shown, the main component of raw material desulfurization gypsum is CaSO 4 2H 2 O.

[0028] The product is CaCO 3 ,Such as figure 2 As shown, the XRD characterization results have no other miscellaneous peaks, indicating that the CaCO prepared in this example 3 Higher purity and better crystallinity.

[0029] image 3 with Figure 4 All are scanning electron microg...

Embodiment 2

[0031] Weigh 5g of desulfurized gypsum, assuming its main component is CaSO 4 2H 2 O mass fraction is 90%, reactant CaSO 4 2H 2 The molar ratio of O to sodium carbonate was 0.80 for feeding. The solid raw materials are weighed and poured into a mortar, fully ground and mixed for 60 minutes. The reaction product was ground, washed with deionized water, filtered to remove soluble salts, and the remaining solid was dried in hot air at 70°C to obtain the final product fine powder calcium carbonate. There are no other miscellaneous peaks in XRD, and the overall particle size is below 2 μm.

Embodiment 3

[0033] Weigh 5g of desulfurized gypsum, assuming its main component is CaSO 4 2H 2 O mass fraction is 90%, reactant CaSO 4 2H 2 The molar ratio of O to sodium carbonate was 0.75 for feeding. The solid raw materials are weighed and poured into a mortar, fully ground and mixed for 20 minutes. The reaction product was ground, washed with deionized water, filtered to remove soluble salts, and the remaining solid was dried in hot air at 70°C to obtain the final product fine powder calcium carbonate. There are no other miscellaneous peaks in XRD, and the overall particle size is below 5 μm.

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Abstract

The invention relates to a method for synthesizing calcium carbonate from desulfurized gypsum through solid-phase grinding. The method comprises the following steps: step 1, weighing the desulfurized gypsum and a solid carbon source in proportion; step 2, mixing the desulfurized gypsum and the solid carbon source weighed in the step 1, and fully grinding to enable the desulfurized gypsum and the solid carbon source to react, so as to obtain a grinding reaction product after the grinding is completed; and step 3, washing the grinding reaction product obtained in the step 2 with a washing agent, filtering the washing product to remove soluble salt, and drying the residual solid to obtain fine powder calcium carbonate. The overall particle size of the obtained calcium carbonate is 1-5 microns. The method has the beneficial effects that the use of a liquid-phase solvent is reduced to the greatest extent, and unnecessary solvent waste is reduced; the synthesis process is only simple grinding and mixing of primary raw materials, and is more simplified compared with a traditional method; great industrial application prospects are realized; and the obtained product is calcium carbonate which has good crystallinity, small particle size, high purity and a high added value.

Description

technical field [0001] The invention belongs to the field of resource utilization of desulfurized gypsum and preparation of calcium carbonate, and in particular relates to a method for synthesizing calcium carbonate from desulfurized gypsum through solid-phase grinding. Background technique [0002] At present, my country's power generation is mainly based on coal-fired thermal power generation. Limestone wet desulfurization is the most mature and widely used desulfurization technology for coal-fired power plants. This technology will produce a large amount of by-product desulfurization gypsum (mainly composed of CaSO 4 2H 2 O), at present, the annual output of desulfurization gypsum in my country has reached hundreds of millions of tons. There are certain differences in the properties of desulfurized gypsum and natural gypsum, and natural gypsum in my country is rich in reserves and low in cost, so its commercial value is low. Most of desulfurized gypsum is mainly disposed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/18C01P2004/61
Inventor 杜凯敏陈锡炯刘春红项飞鹏祁志福刘毅王伟建胡晨晖
Owner ZHEJIANG ZHENENG TECHN RES INST
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