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Pretreatment method of phosphogypsum and paper gypsum board and preparation method thereof

A technology of plasterboard and phosphogypsum, which is applied in the direction of manufacturing tools, surface layering devices, ceramic molding machines, etc., can solve the problems of large primary investment, waste water generation, secondary pollution, etc., achieve small water demand, and avoid secondary pollution. Secondary pollution and reduction of treatment costs

Inactive Publication Date: 2019-01-04
BEIJING NEW BUILDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A small number of enterprises use water washing to process phosphogypsum. The cost of the water washing method is relatively high, the initial investment is large, and waste water will be generated, causing secondary pollution.

Method used

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  • Pretreatment method of phosphogypsum and paper gypsum board and preparation method thereof
  • Pretreatment method of phosphogypsum and paper gypsum board and preparation method thereof
  • Pretreatment method of phosphogypsum and paper gypsum board and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] After drying 100kg phosphogypsum, mix with 0.1kg quicklime, ball mill, calcinate at 140℃, and age; add 1kg modified corn starch, 2kg CaCO 3 , 1kg of organic silicon oil, 0.15kg of sodium alkyl sulfonate, 75kg of water, stir evenly to make a slurry; the slurry is combined with the upper and lower protective paper to form, cut, and finally dried to make a plasterboard.

[0032] Compared with the gypsum board prepared by using untreated phosphogypsum (other preparation processes are the same as in Example 1), the bonding performance of the gypsum board prepared in Example 1 has been improved from level V to level II, 2h The water absorption rate reached 6.83%, the transverse breaking load increased by 24%, and the longitudinal breaking load increased by 31%.

Embodiment 2

[0034] After drying 100kg phosphogypsum, mix with 3kg quicklime, ball mill, calcinate at 180℃, and age; add 0.3kg modified corn starch, 0.1kg CaCO 3 , 0.1kg organosilicon oil, 0.04kg polyethylene glycol, 65kg water, stir evenly to make a slurry; the slurry is combined with the upper and lower protective paper to form, cut, and finally dried to make a plasterboard.

[0035] Compared with the gypsum board prepared by using untreated phosphogypsum (other preparation processes are the same as in Example 2), the bonding performance of the gypsum board prepared in Example 2 has been improved from level V to level II, 2h The water absorption rate reached 8.9%, the transverse breaking load increased by 22%, and the longitudinal breaking load increased by 29%.

Embodiment 3

[0037] After drying 100kg phosphogypsum, mix with 0.8kg quicklime, ball mill, calcinate at 180℃, and age; add 0.6kg modified corn starch, 0.8kg CaCO 3 , 0.6kg organosilicon oil, 0.08kg saponin rosin acid, 72kg water, stir evenly to make a slurry; the slurry is combined with the upper and lower masking paper to form, cut, and finally dried to make a paper gypsum board.

[0038] Compared with the gypsum board prepared using untreated phosphogypsum (other preparation processes are the same as in Example 3), the bonding performance of the gypsum board prepared in Example 3 has been improved from level V to level I, 2h The water absorption rate reached 6.9%, the transverse breaking load increased by 40%, and the longitudinal breaking load increased by 53%.

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Abstract

Provided are a pretreatment method of phosphogypsum and a paper gypsum board prepared by using the treated phosphogypsum and a preparation method thereof. The pretreatment method of the phosphogypsumcomprises the steps of drying and mixing the phosphogypsum with quicklime by 100:0.1-3, by weight, grounding, calcining at 140-180 DEG C, and aging; the paper gypsum board comprises, by weight, 100 parts of phosphogypsum, 0.3-1 part of binder, 0.1-3 parts of raw lime, 0.1-2 parts of calcium carbonate, 0.1-1 part of water repellent, 0.04-0.15 part of foaming agent and 65-75 parts of water; the method comprises the steps of mixing the pretreated phosphogypsum with other raw materials, stirring to form a slurry, forming upper and lower protective papers, drying, and cutting according to sizes. The method achieves the comprehensive utilization of the phosphogypsum, and the performance of the prepared paper gypsum board meets the requirements of national standards.

Description

Technical field [0001] This application relates to but not limited to the field of new building materials, and specifically relates to but not limited to a pretreatment method of phosphogypsum for the production of gypsum board, a gypsum board and a preparation method thereof. Background technique [0002] Phosphogypsum is a by-product of the phosphate fertilizer industry. In recent years, China's phosphate fertilizer production and consumption have ranked first in the world. With the rapid development of the phosphate fertilizer industry, the annual output of phosphogypsum has continued to increase. By 2013, the annual output of phosphogypsum in my country had reached approximately 70 million tons. Among various industrial by-product gypsum in China, phosphogypsum has the largest output, accounting for 38% of the total. The utilization rate of phosphogypsum in developed countries such as Japan, South Korea and Germany is relatively high. Japan has reached about 90%, while the u...

Claims

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Application Information

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IPC IPC(8): C04B11/26C04B11/30C04B28/14C04B38/10C04B111/27B28B19/00
CPCB28B19/0092C04B11/26C04B11/30C04B28/143C04B38/10C04B2111/00017C04B2111/27C04B2103/44C04B7/34C04B14/28C04B2103/65
Inventor 王莹王鹏起尹东杰王丽谭丹君何亮
Owner BEIJING NEW BUILDING MATERIAL
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