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Preparation method for gypsum product

A technology for gypsum and products, applied in the field of preparation of gypsum products, can solve the problems of decreased fluidity of slurry and low strength of gypsum products, and achieve the effects of stable fluidity, high strength, and improved drying rate

Active Publication Date: 2016-05-25
TAISHAN GYPSUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned admixtures increase the drying rate by reducing the water consumption, the fluidity of the slurry will decrease significantly during the preparation process, and the strength of the obtained gypsum products is not high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The invention provides a kind of preparation method of gypsum product, comprises the following steps:

[0024] a) Grinding and sieving the gypsum raw material, then drying to obtain gypsum powder;

[0025] b) After mixing gypsum powder, sodium bisulfate and water, injection molding is carried out to obtain a gypsum test block; the mass ratio of the gypsum powder and sodium bisulfate is 100: (0.2-0.3);

[0026] c) drying the gypsum test piece to obtain a gypsum product.

[0027] In the present invention, the gypsum raw material is ground and sieved, and then baked to obtain gypsum powder. In the present invention, the grade content of the gypsum raw material is preferably 80%-95%, more preferably 85%-90%. In the present invention, the grade content of the gypsum raw material refers to the weight of calcium sulfate per unit weight of the gypsum raw material. The present invention has no special restrictions on the type and source of the gypsum raw material, and natural...

Embodiment 1

[0042] (1) Grind the mixture of 3.5kg phosphogypsum and 1.5kg desulfurized gypsum, pass through a 20-mesh sieve, and then put it into an oven at 155°C for 60 minutes to obtain gypsum powder.

[0043] (2) Add 0.2% sodium bisulfate of gypsum powder quality to the above-mentioned gypsum powder and mix evenly to obtain the powder; add water to the mixing bowl according to the water consumption of 65% standard thickness, then add the powder into the water rapidly, Stir for 30s at a speed of 160r / min to obtain a slurry; then quickly pour the slurry into a triple test mold, scrape off excess slurry with a scraper, scrape the surface, and remove the mold after 45 minutes of injection molding to obtain a gypsum test block.

[0044] (3) Dry the above-mentioned gypsum test block in a blast drying oven at 50° C. for 8 hours to obtain a gypsum product.

[0045] The drying rate of the gypsum products provided in Example 1 is detected by using a ZK-35A type electric vacuum oven, and the resu...

Embodiment 2

[0047] (1) Grind the mixture of 3.5kg phosphogypsum and 1.5kg desulfurized gypsum, pass through a 20-mesh sieve, and then put it into an oven at 155°C for 60 minutes to obtain gypsum powder.

[0048] (2) Add 0.3% sodium bisulfate of gypsum powder quality to the above-mentioned gypsum powder and mix evenly to obtain powder; water is added to the mixing bowl according to the water consumption of 65% standard thickness, and then the powder is quickly added to the water, Stir for 30s at a speed of 160r / min to obtain a slurry; then quickly pour the slurry into a triple test mold, scrape off excess slurry with a scraper, scrape the surface, and remove the mold after 45 minutes of injection molding to obtain a gypsum test block.

[0049] (3) Dry the above-mentioned gypsum test block in a blast drying oven at 50° C. for 8 hours to obtain a gypsum product.

[0050] According to the method provided in Example 1, the drying rate and strength of the gypsum product provided in Example 2 we...

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Abstract

The invention provides a preparation method for a gypsum product. The preparation method comprises the following steps: a) grinding and screening gypsum raw materials and performing baking to obtain gypsum powder; b) mixing the gypsum powder, sodium hydrogen sulfate and water, and performing injection molding to obtain a gypsum test block, wherein a mass ratio of the gypsum powder to sodium hydrogen sulfate is 100 to (0.2-0.3); and c) drying the gypsum test block to obtain the gypsum product. Compared with the prior art, the preparation method for the gypsum product, provided by the invention, has the advantages that by adding a specific amount of sodium hydrogen sulfate, the drying rate of the gypsum product in the preparation process is increased on the basis of not reducing the water consumption, so that slurry in the preparation process has stable flowability and the prepared gypsum product is ensured to have relatively high strength. An experimental result shows that the drying rate of the gypsum product provided by the invention is more than 12.38% and the strength of the gypsum product is 2.2-2.5MPa.

Description

technical field [0001] The invention relates to the technical field of gypsum, and more specifically, relates to a preparation method of gypsum products. Background technique [0002] Gypsum is a widely used industrial material and construction material, which can be used in gypsum building products, cement retarder, model making, medical food additive, sulfuric acid production, paper filler, paint filler, etc. In recent years, gypsum materials and gypsum products have been widely used in interior decoration and decoration of buildings, especially in the decoration and decoration of family houses. Compared with other similar materials, gypsum products have the characteristics of relatively light texture, high strength and good fire resistance. One of the preferred materials for decoration. [0003] At present, the preparation method of gypsum products is mainly to dry the slurry with a certain standard thickness after injection molding to obtain gypsum products. Among the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B22/14
CPCC04B28/14C04B2201/50C04B22/147
Inventor 曹志强段广明葛绪英冯富玲宋晓光杨迪王玉涛郭超
Owner TAISHAN GYPSUM CO LTD