Method for high-efficiency production of alpha type hemihydrated gypsum

A technology of hemihydrate gypsum and dihydrate gypsum, which is applied in the field of high-efficiency production of α-type hemihydrate gypsum, can solve the problems of low production efficiency, achieve the effects of improving processing capacity, shortening production cycle, and fewer process steps

Active Publication Date: 2018-03-02
宁夏博得石膏研究院(有限公司)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a method for efficiently producing α-type hemihydrate gypsum, which has solved the problem

Method used

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  • Method for high-efficiency production of alpha type hemihydrated gypsum
  • Method for high-efficiency production of alpha type hemihydrated gypsum
  • Method for high-efficiency production of alpha type hemihydrated gypsum

Examples

Experimental program
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Example Embodiment

[0047] Example 1

[0048] Provide aluminum sulfate and citric acid as a crystal conversion agent, grind the aluminum sulfate and citric acid powder to 100 mesh, and mix the 100 mesh aluminum sulfate powder and the citric acid powder at a mass ratio of 1:0.15 to obtain a conversion Crystal powder; provide natural dihydrate gypsum powder with a water content of 2% and a particle size range of 0.03-5mm; load 1.15% of natural dihydrate gypsum powder and natural dihydrate gypsum powder into the coulter Mix in the mixer for 5-10 minutes until uniform to obtain a mixture; put the mixture into the crystal converter, and the loose volume of the mixture in the crystal converter is 80% of the volume of the crystal converter; 0.35MPa saturated water vapor was passed into the vessel, and after the temperature in the crystal converter reached 150°C, the temperature was maintained and pressure maintained for 6 hours to obtain mixed crystals mainly composed of short columnar crystals; the mixed ...

Example Embodiment

[0055] Example 2

[0056] Provide aluminum sulfate and citric acid as a crystal conversion agent, grind the aluminum sulfate and citric acid powder to 100 mesh, and mix the 100 mesh aluminum sulfate powder and citric acid powder at a mass ratio of 1:0.2 to obtain a conversion Crystallizer powder; Desulfurized dihydrate gypsum powder with a water content of 12% and a particle size range of 0.03-0.1mm; 1.2% of the desulfurized dihydrate gypsum powder and desulfurized dihydrate gypsum powder are loaded into the plough Mix in a knife mixer for 5-10 minutes until uniform to obtain a mixture; put the mixture into the crystal converter, and the loose volume of the mixture in the crystal converter is 80% of the volume of the crystal converter; The saturated steam of 0.4MPa was passed into the crystallizer, and after the temperature in the crystallizer reached 150°C, the temperature and pressure were maintained for 5 hours to obtain mixed crystals mainly composed of short columnar crystal...

Example Embodiment

[0061] Example 3

[0062] Provide aluminum sulfate and citric acid as a crystal conversion agent, grind the aluminum sulfate and citric acid powder to 100 mesh, and mix the 100 mesh aluminum sulfate powder and the citric acid powder at a mass ratio of 1:0.4 to obtain a conversion Crystal powder; provide citric acid dihydrate gypsum powder with a water content of 15% and a particle size of less than 0.1mm; load 0.14% of the citric acid dihydrate gypsum powder and citric acid dihydrate gypsum powder into the plough Mix in a knife mixer for 5-10 minutes until uniform to obtain a mixture; put the mixture into the crystal converter, and the loose volume of the mixture in the crystal converter is 80% of the volume of the crystal converter; The saturated steam of 0.4MPa was passed into the crystallizer, and after the temperature in the crystallizer reached 150°C, the temperature and pressure were maintained for 5h to obtain mixed crystals mainly composed of short columnar crystals; the ...

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Abstract

The invention discloses a method for high-efficiency production of alpha type hemihydrated gypsum; the method comprises the steps: firstly, pretreating a provided crystal transformation agent into a crystal transformation agent powder with the particle size of 80-100 mesh, and then evenly mixing the crystal transformation agent powder with a provided dihydrate gypsum powder with the mass ratio of0.02-0.8%, to obtain a mixture powder; directly loading the mixture powder with the bulk volume of 75-85% of the volume of a crystal transformation device into the crystal modification device; introducing 0.25-0.45 MPa saturated water vapor to the crystal modification device, at the moment, gradually permeating the saturated water vapor into a loose material layer, gradually dissolving the powdercrystal transformation agent, gradually increasing the temperature of the mixture to 135-160 DEG C, carrying out heat and pressure insulation for 4-6 h, completing crystal transformation of the mixture, and forming a mixed-crystal crystal with a short columnar crystal as the main part; and finally, drying the mixed-crystal crystal to obtain the alpha type hemihydrated gypsum. The method for high-efficiency production of the alpha type hemihydrated gypsum can effectively improve the production efficiency when the alpha type hemihydrated gypsum is produced with powdered dihydrate gypsum as the raw material, especially with industrial by-product gypsum as the raw material.

Description

technical field [0001] The invention relates to the technical field of production of α-type hemihydrate gypsum, in particular to a method for efficiently producing α-type hemihydrate gypsum. Background technique [0002] The main component of dihydrate gypsum is calcium sulfate dihydrate (CaSO 4 .2H 2 O), it can be dehydrated under certain conditions to produce hemihydrate gypsum (CaSO 4 .0.5H 2 O). According to different dehydration conditions, the prepared hemihydrate gypsum can be divided into α-type hemihydrate gypsum and β-type hemihydrate gypsum. The performance and application of these two kinds of hemihydrate gypsum are also quite different. Among them, α-type hemihydrate gypsum is a regular crystal formed by the transformation of dihydrate gypsum under steam conditions above 100°C. It has high gelling strength, small specific volume, and small water-to-paste ratio, and is also called high-strength hemihydrate gypsum; The ceramic mold made of type hemihydrate gy...

Claims

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Application Information

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IPC IPC(8): C04B11/02
CPCC04B11/02
Inventor 王立明陈兴福周军璞王凯
Owner 宁夏博得石膏研究院(有限公司)
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