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Calcium sulfate gypsum and preparation method thereof

A technology of calcium sulfate and gypsum, applied in the direction of cement production, etc., can solve problems such as waste of resources, achieve the effects of improving work efficiency, good economic and social benefits, and realizing resource recycling

Pending Publication Date: 2020-11-03
汪文杰 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the treatment method of glauberite slag is open-air stacking, and finally landfilled with loess, resulting in waste of resources

Method used

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  • Calcium sulfate gypsum and preparation method thereof
  • Calcium sulfate gypsum and preparation method thereof

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[0023] The present invention also provides the preparation method of the calcium sulfate gypsum described in above-mentioned technical scheme, comprises the following steps:

[0024] The calcium sulfate gypsum is obtained by mixing the glauberite waste slag and dihydrate gypsum for crystallization reaction and crushing.

[0025] In the present invention, the glauberite waste residue is preferably prepared by a method comprising the following steps:

[0026] The glauberite waste residue raw material is rinsed to obtain the glauberite waste residue. In the present invention, the specific process of the rinsing is preferably as follows: after leveling the glauberite waste residue raw material, rinse it with water for 2 to 3 days, and then dry it naturally to obtain the initial leaching glauberite waste residue; After the waste residue is flattened, rinsed with water for 2 to 3 days, and then air-dried to obtain the glauberite waste residue.

[0027] In the present invention, th...

Embodiment 1

[0034] Take 500kg of glauberite waste residue (the mass percentage of sodium sulfate is 5%) and 500kg of fluorogypsum, mix and stir evenly, control the temperature at 60°C for crystallization reaction for 8 hours, and crush it into granules after the end to obtain a particle size of 20-80mm calcium sulfate gypsum.

[0035] The preparation method of described glauberite waste residue is:

[0036] After leveling the glauberite waste slag raw material, rinse with water for 3 days, and then air-dry naturally to obtain the glauberite waste slag for the first leaching;

[0037] After flattening the glauberite waste slag from the initial rinsing, rinsing with water for 3 days, and then air-drying to obtain the glauberite waste slag.

Embodiment 2

[0039] Get 400kg of glauberite waste residue (the mass content of sodium sulfate is 5%), 300kg of fluorogypsum and 300kg of titanium gypsum, mix and stir evenly, control the temperature at 30°C for crystallization reaction for 3 hours, and pulverize into granules after the end, to obtain a particle size of 20 ~80mm calcium sulfate plaster.

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Abstract

The invention provides calcium sulfate gypsum and a preparation method thereof, and belongs to the technical field of waste recycling and cement. The calcium sulfate gypsum provided by the invention is prepared from the following raw materials: glauberite waste residues and dihydrate gypsum. According to the invention, the glauberite waste residue and dihydrate gypsum are used as raw materials toprepare the raw material calcium sulfate gypsum for industrial cement, so that the resource reutilization of the glauberite waste residue is realized. Meanwhile, the invention further provides a preparation method of the glauberite waste residues, a small amount of sodium sulfate in the glauberite waste residues is utilized, the reaction time of crystal water is greatly saved, the working efficiency is improved, the temperature is controlled to be 60 DEG C or below, and the crystal water can be effectively prevented from being converted into external water; therefore, the mass percentage of sulfur trioxide in the final calcium sulfate gypsum is more than 35%, the mass percentage of crystal water is more than 8%, and the mass percentage of external water is less than 10%. According to the method, good economic benefits and social benefits are brought while resource recycling is achieved.

Description

technical field [0001] The invention relates to the field of waste recycling and cement technology, in particular to a calcium sulfate gypsum and a preparation method thereof. Background technique [0002] Natural gypsum is an indispensable raw material for cement production. It is mainly composed of calcium sulfate and crystal water. The main indicators of natural gypsum are about 30% by mass of sulfur trioxide and about 10% by mass of crystallization water. . The glauberite waste slag produced by sodium sulfate production enterprises is composed of a mixture of 20% calcium sulfate and 40% sodium sulfate by mass percentage, and the mass percentage content of sodium sulfate, the gypsum raw material used in cement production It cannot exceed 2.5%, otherwise it will cause great loss to the 28-day strength of cement; so glauberite waste residue cannot be used as gypsum raw material for cement production. Therefore, the treatment method of glauberite slag is open-air stacking,...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B22/14
CPCC04B7/24C04B22/146Y02P40/10
Inventor 汪文杰汪德仁
Owner 汪文杰
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