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Method for preparing alpha-type high-strength gypsum powder

A gypsum powder and high-strength technology, which is applied in the field of preparation of α-type high-strength gypsum powder, can solve the problems of large equipment investment, limited usage, high price, etc., and achieve the effects of reducing labor intensity, reducing production costs, and obvious economic benefits

Inactive Publication Date: 2014-01-01
湖北龙源石膏有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of traditional α-type hemihydrate gypsum is complicated, the equipment investment is large, the production cost is high, and the price is high, which limits its usage. Both at home and abroad are researching and developing a new technology for α-type hemihydrate gypsum powder, which can be greatly reduced. Its production cost is listed as a major research topic in the gypsum industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of α-type high-strength gypsum powder, the steps are:

[0027] A. Base material preparation: clean, dry, and classify the natural gypsum ore into storage, the crystal water content is ≥19%, the dihydrate gypsum grade is ≥96%, and the gypsum block is broken to 20 or 30 or 35 or 40 or 45 or 50mm;

[0028] B. Stack the gypsum blocks in layers into the barrel, hoist the barrel into the autoclave with a crane, two barrels per kettle, fix the barrel, close the lid of the kettle, and start the autoclave. Adjust the inlet pressure of the autoclave to 0.2 or 0.21 or 0.22 or 0.23 or 0.24 or 0.25MPa, heat the material in the autoclave to a temperature of 135 or 136 or 137 or 138°C, and exhaust the cold air in the autoclave. is 10 or 10.5 or 11h;

[0029] C. After the autoclaving is completed, the material is dried in the same kettle, and steam is passed into the heating tube, the drying temperature is 130 or 132 or 134 or 136 or 138 or 140 ° C, and the dry...

Embodiment 2

[0032] A preparation method of α-type high-strength gypsum powder, the steps are:

[0033] The natural dihydrate gypsum is screened and stored, crushed to a fineness of 50mm, fed into the evaporation kettle, the pressure is 0.25MPa, the temperature is 135°C-138°C, the autoclave time is 11h, dried, ground, and packaged to obtain α-type high-strength gypsum powder. The initial setting is 6', the final setting is 9', the highest hydration temperature is 48°C, and the 2h flexural strength is 6.3MPa.

[0034] Other implementation steps are the same as in Example 1.

Embodiment 3

[0036] A preparation method of α-type high-strength gypsum powder, the steps are:

[0037] The natural dihydrate gypsum is screened and stored, crushed to a fineness of 40mm, fed to the evaporator, pressure 0.25MPa, temperature 135°C-138°C, autoclaved for 10.5h, dried, ground, and packaged to obtain α-type high-strength gypsum powder. The initial setting is 6', the final setting is 10', the highest hydration temperature is 48°C, and the 2h flexural strength is 6.3MPa.

[0038] Other implementation steps are the same as in Example 1.

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Abstract

The invention discloses a method for preparing alpha-type high-strength gypsum powder. The method comprises the steps: A, preparing a base material, cleaning, drying and classifying natural gypsum ore to be placed into a storage, and breaking gypsum blocks, wherein the content of crystal water >=19%, and the grade of dihydrate gypsum >=96%; B, stacking the gypsum blocks into charging baskets in a layering mode, using a travelling crane for lifting the charging baskets into still kettles, fixing the charging baskets, and closing kettle covers, wherein two charging baskets are arranged in each kettle; adjusting intake pressure of the still kettles, heating materials inside the kettles, exhausting cold air inside the kettles, and starting to conduct steam pressing; C, after the steam pressing is completed, drying the materials inside the same kettle, conducting steaming into heating pipes, and conducting drying; D, conducting slot-type discharging, conducting grinding, and conducting packaging to obtain the alpha-type high-strength gypsum powder. The method is easy to implement and convenient to operate, the labor intensity of workers is greatly reduced, and the production cost is reduced. The alpha-type high-strength gypsum powder produced by the process is high in strength, high in hydration speed, beneficial to saving the stripping time, and capable of being produced in a large-scale mode.

Description

technical field [0001] The invention relates to architectural decoration and ceramic model materials, and more particularly to a preparation method of alpha-type high-strength gypsum powder. Background technique [0002] Gypsum is a multifunctional air-hardening cementitious material and one of the three traditional cementitious materials. As one of the basic materials for gypsum products, α-type high-strength gypsum powder is being used in ever-expanding fields due to its excellent strength and performance, and its demand is rising sharply. α-type high-strength gypsum is dihydrate gypsum (CaSO 4 2H 2 O) Hemihydrate gypsum powder (α-CaSO) mainly obtained by dissolving and recrystallizing in saturated water vapor medium or liquid aqueous solution under certain conditions such as temperature and pressure 4 1 / 2H 2 o). Compared with other inorganic cementitious materials, α-type high-strength gypsum has many advantages, such as light weight, fire prevention, good sound and ...

Claims

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Application Information

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IPC IPC(8): C04B11/032
Inventor 高德武余永忠郑孝国王兵林
Owner 湖北龙源石膏有限公司
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