Method for producing paper gypsum board using desulfurated gypsum and ardealite

A paper-faced gypsum board, desulfurized gypsum technology, used in ceramic molding machines, manufacturing tools, etc., can solve the problem of difficult to control dry powder conveying, metering, feeding performance, weak bonding performance between gypsum board surface and board core, and board. The problem of poor adhesion between the core and the cover paper can improve the drying effect and the utilization rate of heat energy, avoid over-burning of the side wall powder, and shorten the setting time.

Inactive Publication Date: 2006-07-19
TAISHAN GYPSUM CO LTD
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Problems solved by technology

This is because phosphogypsum has high impurity content, many types, acidity, and unstable performance. If phosphogypsum is used alone instead of natural gypsum, the bonding performance between the gypsum board surface and the core will be weak, the water demand will be unstable, and the setting time will be unstable. Longer adverse phenomenon; while desulfurization gypsum is relatively low in impurity content, less in variety, neutral and alkaline, and rel...

Method used

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  • Method for producing paper gypsum board using desulfurated gypsum and ardealite

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Embodiment Construction

[0018] The technical scheme of the present invention will be further described below in conjunction with the accompanying drawings.

[0019] 1. Send 70 parts of phosphogypsum and 30 parts of desulfurized gypsum to the feeder according to the weight ratio of spare industrial by-product gypsum, and then transport them to the drum rotary dryer heated by the hot blast stove for drying , the drying temperature is controlled at 100°C, and mixed while drying. When the free moisture in the mixture is below 5%, it is sent to the silo through the belt conveyor and elevator;

[0020] 2. Sieve the material in the silo and send it to the hot flue gas fluidized furnace for continuous calcination at 200°C. When the crystal water in the mixture drops to 8%, it will be sent to the powder warehouse by belt conveyor for cooling and aging ;

[0021] 3. Accurately weigh 100 parts by weight of the aged powder through an electronic belt scale and send it to the mixer, and add 6 parts by weight of c...

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Abstract

The invention discloses a making method of paper plaster board, which comprises the following steps: mixing the phosphogypsum and desulfuration plaster according to the weight ratio at 50-90:50-10; drying until the free water content under 5 percent; sintering the plaster at 160-220 DEG C continually to form the calcined gypsum powder with 5-9 percent crystal water; cooling in the bin; placing to obtain the architecture plaster powder; stirring the plaster powder with white corn starch latex, foaming agent, glass fiber and water evenly into material paste; compounding the roof and bottom of paper plaster board through plate-typed molder. The invention saves the natural plaster resource and cost, which improves the product property.

Description

technical field [0001] The invention belongs to building decoration materials, in particular to a plasterboard with paper surface. Background technique [0002] In the production of agricultural phosphate fertilizer, my country discharges 30 million tons of phosphogypsum every year, which occupies a large amount of land for storage and causes secondary pollution to the environment. In the flue gas desulfurization process of coal-fired thermal power plants, the desulfurization device produces a large amount of desulfurization gypsum. The annual discharge of wet desulfurization gypsum in power plants is about 4 million tons, and it is expected to reach more than 10 million tons in 2006. Phosphogypsum and desulfurization gypsum are collectively referred to as industrial by-product gypsum, and its chemical composition is CaSO 4 2H 2 O, the content is as high as 90%. These industrial gypsums are currently mainly used as cement admixtures, building hollow blocks, plastering gy...

Claims

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Application Information

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IPC IPC(8): B28B1/52B28B1/16
Inventor 贾同春曹志强孙善锟任绪连段振涛
Owner TAISHAN GYPSUM CO LTD
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