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Method for producing alpha type high-strength gypsum powder by using desulfurization gypsum serving as industrial byproduct

A technology for desulfurizing gypsum and by-products, which is applied in the field of inorganic material preparation, can solve problems such as high cost and cumbersome process, and achieve the effects of simple ingredients, easy-to-obtain raw materials, and high social and economic benefits

Inactive Publication Date: 2011-11-23
刘长昕 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many additives need to be added in the disclosed scheme, the process is cumbersome and the cost is high

Method used

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  • Method for producing alpha type high-strength gypsum powder by using desulfurization gypsum serving as industrial byproduct
  • Method for producing alpha type high-strength gypsum powder by using desulfurization gypsum serving as industrial byproduct
  • Method for producing alpha type high-strength gypsum powder by using desulfurization gypsum serving as industrial byproduct

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 As shown, the α-type high-strength gypsum powder produced by industrial by-product desulfurization gypsum is obtained by the following method: take 100 parts of industrial by-product desulfurization gypsum, and extrude it into a certain geometric shape under a pressure of 0.5-5 MPa, and then Drying method: dry at a temperature lower than 80°C or dry naturally until the water content is ≤3%, and then dry at a pressure of 4-6kgf / cm 2 Autoclave for 4-6 hours and dry again until the water content is below 3%. Afterwards, it is crushed to pass through a 80-200 mesh sieve, and calcined at a high temperature of 120-210°C for 30-150 minutes to obtain α-type high-strength gypsum powder, which is packed and stored for later use.

Embodiment 2

[0024] Such as figure 2 As shown, the α-type high-strength gypsum powder produced by the industrial by-product desulfurized gypsum is obtained by the following method: take 80 parts of the industrial by-product desulfurized gypsum, add β-type hemihydrate gypsum (CaSO 4 1 / 2H 2 O) 20 parts, stir evenly. And extrude it into a certain geometric shape under the pressure of 0.5 ~ 5MPa, then dry it at a temperature lower than 80°C or dry it naturally until the water content is ≤ 3%, and then dry it under a pressure of 4 ~ 6kgf / cm 2 Autoclave for 4-6 hours and dry again until the water content is less than 3%, then crush until it can pass through a 80-200 mesh sieve, and calcined at 120-210°C for 30-150 minutes to obtain α-type high-strength gypsum powder. Pack this α-type high-strength gypsum powder and put it aside for later use.

Embodiment 3

[0026] Such as figure 2 As shown, the α-type high-strength gypsum powder produced by the industrial by-product desulfurized gypsum is obtained by the following method: in parts by mass, take 95 parts of the industrial by-product desulfurized gypsum, add α-type hemihydrate gypsum (CaSO 4 1 / 2H 2 O) 5 parts, and extrude it into a certain geometric shape under a pressure of 0.5-5MPa, then dry it at a temperature lower than 80°C or naturally dry it to a water content of ≤3% in a conventional drying method, and then dry it under a pressure of 4 ~6kgf / cm 2 Autoclave for 4-6 hours and dry again until the water content is less than 3%, then crush until it can pass through a 80-200 mesh sieve, and calcined at 120-210°C for 30-150 minutes to obtain α-type high-strength gypsum powder.

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Abstract

The invention relates to a method for producing alpha type high-strength gypsum powder by using desulfurization gypsum serving as an industrial byproduct, and belongs to the field of the preparation of inorganic materials. The method is characterized by comprising the following steps of: extruding desulfurization gypsum serving as the industrial byproduct is extruded under the pressure of between 0.5 and 5 MPa to be formed, drying, autoclaving, drying again, crushing, sieving with an 80 to 200-mesh sieve, and calcining at the high temperature of between 120 and 210 DEG C for 30 to 150 minutes to obtain the alpha type high-strength gypsum powder. By the method, a new path is opened up for the comprehensive utilization of the desulfurization gypsum serving as solid waste of the industrial byproduct, and a new simple and low-cost method is also opened up for the preparation of die gypsum and self-leveling masterbatch gypsum by utilizing the industrial desulfurization gypsum, so mineral resources are saved, the occupation of land resources is reduced, and the problem of secondary pollution is solved.

Description

technical field [0001] The invention discloses a method for producing alpha-type high-strength gypsum powder with industrial by-product desulfurized gypsum, which belongs to the field of inorganic material preparation, and specifically relates to a method for producing alpha-type gypsum molds and alpha-type self-leveling masterbatches with industrial by-product desulfurized gypsum. Background technique [0002] my country is a country where coal is the main energy source, and the sulfur content of coal in my country is generally high. Therefore, the SO produced by coal combustion 2 become one of the main pollutants of air pollution. Due to economic, technical, policy and many other reasons, SO 2 Emissions have been out of control in the past. According to the Bulletin on the State of the Environment in China, in 2004 the national SO 2 The emissions are 22.5 million tons. Among them, thermal power plant SO 2 The emission is about 12 million tons, accounting for about 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26
CPCC04B11/264C04B11/032
Inventor 刘长昕李德厚
Owner 刘长昕
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