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Process for producing alpha gypsum powder by liquid phase method

A technology of gypsum powder and liquid phase method, which is applied in the field of α gypsum powder production, which can solve problems such as unstable product performance, uneven heating, temperature adjustment, etc., and achieve stable product performance, small restrictions, and simple process.

Inactive Publication Date: 2007-10-24
山东金信新型建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the dehydration process of gypsum into α gypsum is particularly sensitive to temperature, and manual control just cannot adjust the temperature in time, and at the same temperature, each can of gypsum is heated unevenly at different positions, which leads to dry production in my country. The products produced by the process are mainly α gypsum powder, mixed phase gypsum products of dihydrate gypsum, β gypsum, and anhydrous gypsum. The performance is greatly reduced, and the product performance is extremely unstable due to the existence of dihydrate gypsum, β gypsum, and anhydrous gypsum

Method used

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  • Process for producing alpha gypsum powder by liquid phase method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Grade > 95% massive transparent dihydrate gypsum, crushed to obtain gypsum with block size 2 The gypsum slurry (measured by the density measurement system) is initially heated to 55°C by heat-conducting oil, and then pumped into the crystal converter through a high-pressure slurry pump, where it is further diluted with water and added with crystal Add maleic anhydride, and raise the temperature to 125°C with a small increase in temperature. At this time, the gypsum crystals react under the crystal modifier and a pressure of 3.0 MPa to form α-gypsum crystals, and the crystal modifier dosage is controlled as needed to control the shape of the crystals. At the same time, at regular intervals, samples are taken from the sampling hole and observed under a microscope. When it is found that most of the gypsum (about 98%) is converted into regular α-gypsum crystals, the α-crystal slurry is pumped into the next turn by using the pressure difference. Crystallizer, carry out secon...

Embodiment 2

[0030] Grade > 90% massive transparent dihydrate gypsum, after crushing to obtain gypsum with block size 2 The gypsum slurry (measured by the density measurement system) is initially heated to 50°C by heat transfer oil, and then pumped into the crystal converter through a high-pressure slurry pump, where it is further diluted with water and added with crystal Add maleic anhydride, and raise the temperature to 98°C with a small increase in temperature. At this time, the gypsum crystals react under the crystal modifier and a pressure of 3.5 MPa to form α-gypsum crystals, and the crystal modifier dose is controlled as needed to control the shape of the crystals. At the same time, at regular intervals, samples are taken from the sampling hole and observed under a microscope. When it is found that most of the gypsum (about 98%) is converted into regular α-gypsum crystals, the α-crystal slurry is pumped into the next turn by using the pressure difference. crystallizer, carry out sec...

Embodiment 3

[0035] The fibrous gypsum with a grade > 97% is crushed to obtain gypsum with a block size of 2 (measured by a density measuring system) gypsum slurry, the gypsum slurry is initially heated to the corresponding temperature of 35°C by heat-conducting oil, and then pumped into the crystal converter through a high-pressure slurry pump, where it is further diluted with water and added Crystal transformation agent maleic anhydride, and raise the temperature to 110°C with a slight temperature increase. At this time, the gypsum crystals react under the crystal modifier and the pressure of 4.3 MPa to form α-gypsum crystals, and the dosage of the crystal modifiers is controlled as needed to control the shape of the crystals. At the same time, at regular intervals, samples are taken from the sampling hole and observed under a microscope. When it is found that most of the gypsum (about 97%) is converted into regular α gypsum crystals, the α crystal slurry is pumped into the crystal conver...

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Abstract

The invention discloses a manufacturing technique of alpha-plaster powder through liquid-phased method in the alpha-plaster powder preparing technical domain, which comprises the following steps: grinding the plaster into plaster dehydrate with size D50 between 10 and 100um; blending the plaster dehydrate in the mixing tank with water to form the plaster slurry with density at 1395+-50g / cm2; heating to 30-100 deg. c; pumping the slurry into crystal-rotating device; crystallizing for the first time under 90-150 deg. c at 3. 0-5. 0Mpa acted by maleic anhydride as crystal-rotating agent; producing the alpha-plaster slurry with density at 98%; putting the alpha-plaster slurry into another crystal-rotating device; crystallizing for the second time under 110-150 deg. c at 3. 0-4. 0Mpa acted by maleic anhydride as crystal-rotating agent; producing the alpha-plaster slurry with density at 100%; separating the alpha-plaster slurry; drying; obtaining the alpha-plaster crystal particle with density at 100%. The invention reduces the limit and simplifies the technique, which produces the alpha-plaster purity and stability.

Description

(1) Technical field [0001] The invention relates to a production technology of α gypsum powder, in particular to a process for producing α gypsum powder by a liquid phase method. (2) Technical background [0002] Production principle of α-gypsum: In saturated water vapor or solution, the crystal of natural industrial gypsum changes under certain pressure and temperature, and after dehydration, α-hemihydrate gypsum containing 1 / 2 crystalline water molecules is formed. [0003] Domestic status: At present, the production of α high-strength gypsum powder in my country is all done by dry autoclaved dehydration of dihydrate gypsum powder or gypsum block and then fine grinding, and manual control is adopted. Because the dehydration process of gypsum into α gypsum is particularly sensitive to temperature, and manual control just cannot adjust the temperature in time, and at the same temperature, each can of gypsum is heated unevenly at different positions, which leads to dry produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/032
CPCC04B11/032
Inventor 孙令文李康昱杨玉发郭泰民富利娥宋树峰刘友柱
Owner 山东金信新型建材有限公司
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