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Novel architecture gypsum powder and its preparation method

A kind of construction gypsum powder, a new type of technology, applied in the field of new construction gypsum powder, can solve the problems of poor fluidity, long setting time, narrow particle distribution band, etc.

Active Publication Date: 2006-05-03
TAISHAN GYPSUM CO LTD
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  • Description
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AI Technical Summary

Problems solved by technology

If phosphogypsum is used alone instead of natural gypsum to make plasterboard, the bonding performance between the board surface and the board core will be weak, the water demand will be unstable, and the setting time will be too long
When desulfurization gypsum is used alone, due to its poor particle gradation, the particle distribution band is very narrow, and the particles are mainly concentrated between 30 and 60 μm, and the gradation is far worse than that of natural gypsum ground gypsum powder. The strength is lower than the natural gypsum of the same grade; at the same time, it leads to poor fluidity. It is difficult to control the transportation, feeding and metering performance of its dry powder on the one hand, and it is easy to produce segregation after stirring with water. Layer phenomenon will lead to uneven foaming in the board, poor bonding of the board core and the protective paper, etc.

Method used

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  • Novel architecture gypsum powder and its preparation method

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Embodiment Construction

[0007] Phosphogypsum is generally industrial waste from phosphate fertilizer production, and its free water moisture content is generally 8-25%; desulfurized gypsum is generally industrial waste after desulfurization treatment in coal-fired power plants, and its free water moisture content is generally 8-12%. Prepare phosphogypsum and desulfurized gypsum according to their weight ratio: phosphogypsum: desulfurized gypsum=50~90%:10~50%, and send it to the mixer (2) through the conveying device (1) for mixing and mixing, and then send it to the mixer (2). Drying is carried out in the drum dryer (3), and the drying temperature is controlled at 80-150℃ to remove the free moisture in the mixture, so that the free moisture in the dried mixture is controlled at 0-5%; The dried mixture is sent to the boiling furnace (4) for calcination. The calcination temperature is controlled at 160~200℃. The calcination adopts continuous calcination to remove the remaining free water and part of the cr...

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Abstract

The invention relates to a new building gypsum powder and method for paper-faced gypsum board prepared by industrial waste. Wherein, mixing ardealite and desulfurized gypsum with wt% ratio as 50~90%í†10~50%, drying, calcining, cooling, aging, and removing free and crystal water in mixed material. This product has well-improved properties with low cost, and also benefits to environmental protection.

Description

Technical field [0001] The invention relates to a new type of building gypsum powder for producing gypsum products such as paper-faced gypsum board, which is prepared by using industrial waste, and a preparation method thereof. Background technique [0002] The use of industrial waste, especially phosphogypsum and desulfurized gypsum, to replace natural gypsum as the raw material for the production of gypsum board. Compared with natural gypsum, it reduces production costs, reduces the occupation of arable land, and protects the natural environment, which has attracted people's attention. . The physical properties of phosphogypsum and desulfurized gypsum are different. Phosphogypsum has high impurity content, many types, and is acidic, and its performance is unstable; while desulfurized gypsum has relatively low impurity content, few types, neutrality, and relatively stable performance. In foreign countries, phosphogypsum or desulfurized gypsum (such as phosphogypsum in Korea and ...

Claims

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Application Information

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IPC IPC(8): C04B11/26C04B11/02
Inventor 贾同春曹志强孙善锟
Owner TAISHAN GYPSUM CO LTD
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