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Method for producing high-admixture water resistant phosphogypsum product

A production method and phosphogypsum technology, applied in the chemical industry, can solve the problems of difficulty in meeting the minimum strength requirements of wall materials, reducing waterproof performance, gypsum being eroded by water, etc., achieving good market promotion prospects, improving water resistance, formula and process. simple effect

Inactive Publication Date: 2009-07-29
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that once the surface or part of the coated gypsum product has defects, the exposed gypsum will be eroded by water when it encounters water, reducing the waterproof performance
The disadvantage is that the strength is poor, and it is difficult to meet the minimum strength requirements of some wall materials
And the cost of this kind of gypsum products is more expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Use 1.6kg of phosphogypsum, 0.4kg of yellow phosphorus slag, 0.06kg of lime, and 0.40kg of water. After mixing evenly, fill it in a standard brick mold (240×115×53mm), and under the condition of a molding pressure of 10MPa, The materials are pressed into adobes, cured at normal temperature and pressure for 1 day, and then cured in an autoclave with an autoclave temperature of 220°C and a holding time of 8 hours. After exiting the kettle, high-volume water-resistant phosphogypsum products are obtained.

Embodiment 2

[0022] Use 1.6kg of phosphogypsum, 0.4kg of yellow phosphorus slag, 0.06kg of lime, and 0.40kg of water. After mixing evenly, fill it in a standard brick mold (240×115×53mm), and under the condition of a molding pressure of 15MPa, The materials are pressed into adobes, cured at normal temperature and pressure for 1 day, and then cured in an autoclave, wherein the steam curing temperature is 180°C and the holding time is 8 hours. After exiting the kettle, high-volume water-resistant phosphogypsum products are obtained.

Embodiment 3

[0024] Use 1.4kg of phosphogypsum, 0.3kg of fly ash, 0.2kg of silica fume, 0.16kg of lime, and 0.42kg of water. After mixing evenly, fill it in a standard brick mold (240×115×53mm), and press the molding pressure Under the condition of 10MPa, the materials are pressed into adobes, cured at normal temperature and pressure for 3 days, and then cured in an autoclave. The steam curing temperature is 200°C and the holding time is 10h. After leaving the kettle, high-volume water-resistant phosphogypsum bricks are obtained.

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PUM

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Abstract

The invention discloses a method for producing high addition-amount water-resistant ardealite building material. The method comprises the following steps that: ardealite accounting for 70 to 80 percent of the total weight, hydraulic cementing material accounting for 20 to 30 percent of the total weight and alkaline exciting agent accounting for 1 to 10 percent of the total weight are taken as raw materials and well mixed at a water-ash ratio (mass ratio) of between 0.18 and 0.22 so as to give a mixed material; a die is filled with the mixed material; the mixed material is molded under the pressure of between 10 and 20 MPa so as to prepare blank; the prepared blank is maintained for 1 to 3 days at normal temperature under normal pressure and then put into an autoclave for maintenance; and a medium of steaming-pressing maintenance is water vapor, wherein the steaming-pressing temperature is between 180 and 220 DEG C, and the heat preservation time is between 8 and 12 hours; the mixed material is discharged from the autoclave; and a high addition-amount water-resistant ardealite product can be obtained. The method has the advantages of raising the addition amount of ardealite and remarkably improving the water resistance of the gypsum product.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a production method of phosphogypsum products. Background technique [0002] Phosphogypsum is a kind of industrial waste discharged during the production of phosphoric acid. About 5t of phosphogypsum is discharged for every 1t of phosphoric acid produced. Its discharge not only occupies a large amount of land, but also because phosphogypsum is soaked in rainwater for a long time, the soluble P in it 2 o 5 Harmful substances such as fluoride and fluoride will be transferred to the environment through water bodies, causing serious pollution of soil, water systems, and the atmosphere. Therefore, the comprehensive utilization of phosphogypsum resources is imminent. [0003] At present, there have been literature reports on the production of gypsum boards, gypsum blocks, gypsum bricks and other building material products from phosphogypsum, but these gypsum bu...

Claims

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Application Information

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IPC IPC(8): C04B28/14B28B3/00C04B40/02
CPCC04B28/142C04B2111/27Y02W30/91C04B7/02C04B7/32C04B18/08C04B18/141C04B2103/10C04B14/322C04B22/064
Inventor 杨三可曹建新解田杨林周泳波胡宏刘佳田仁道桂华
Owner WENGFU (GRP) CO LTD
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