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Method for making paper-face gypsum board using high-alkaline-metal content phospheor gypsum

A gypsum board and gypsum-made technology, which is applied in the field of manufacturing gypsum board, can solve the problems of high operating cost, long process technology, and increased energy consumption, and achieve the effects of low operating cost, simple process, and easy operation

Inactive Publication Date: 2011-03-16
TONGLING CHEM IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The characteristics of this process are that the process is long, the investment is large, the operating cost is high, and the problem of wastewater treatment is brought about after washing. At the same time, the free water content of the dihydrate phosphogypsum after washing increases, which is harmful to the gypsum frying in the subsequent section. Unfavorable, because when dihydrate gypsum is fried into hemihydrate gypsum, the increase of free water directly leads to the increase of energy consumption, and the cost rises accordingly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Take a part of phosphogypsum with high alkali metal content (containing K 2 O, Na 2 The total amount of O is 0.11%), after adding 1% fly ash, crushing, mixing and stacking for 0.1 hour, then passing through hammer dryer and fluidized bed furnace to remove free water and crystal water, after grinding for 30 seconds, it can be As a qualified raw material for plasterboard. After testing, the paper-faced gypsum board produced by this scheme has good paper-sticking performance, the initial setting time is greater than 4 minutes, the final setting time is less than 20 minutes, and the flexural strength is greater than 2.24 MPa, which fully meets the production standard requirements of the paper-faced gypsum board.

Embodiment 2

[0013] Take a part of phosphogypsum with high alkali metal content (containing K 2 O, Na 2 O total amount is 0.39%), after adding 10% fly ash, after crushing, mixing and stacking for 3.5 hours, then passing through hammer dryer and fluidized bed furnace to remove free water and crystal water, after grinding for 30 seconds, you can As a qualified raw material for plasterboard. After testing, the paper-faced gypsum board of this scheme has good paper-sticking performance, the initial setting time is greater than 4 minutes, the final setting time is less than 20 minutes, and the flexural strength is greater than 2.16 MPa, which fully meets the production standard requirements of the paper-faced gypsum board.

Embodiment 3

[0015] Take a part of phosphogypsum with high alkali metal content (containing K 2 O, Na 2 O total amount is 0.65%), after adding 20% ​​fly ash (dry basis), after crushing, mixing and stacking for 24 hours, then go through hammer dryer and fluidized bed furnace to remove free water and crystal water, and grind for 30 seconds After that, it can be used as a qualified gypsum board raw material. After testing, the initial setting time is greater than 4 minutes, the final setting time is less than 20 minutes, and the flexural strength is greater than 1.98 MPa, which fully meets the production standard requirements of plasterboard.

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Abstract

The invention discloses a method to make thistle board using phosphogypsum. It includes the following steps: mixing high alkali metal phosphogypsum that the pH value is over 3.5 with waste residues containing sal vitreous body according to 1:1%-20%, crashing, piling for 0.1 hour, taking normal process technology to gain thistle board. The waste residues is one or several from flay ash, furnace influid bed slag and blast furnace granulated slag.

Description

Technical field [0001] The invention relates to a method for manufacturing gypsum boards, in particular to a method for manufacturing gypsum boards by using phosphogypsum with a high alkali metal content as a by-product of wet-process phosphoric acid as a raw material. Background technique [0002] Phosphogypsum is a by-product of wet-process phosphoric acid and is the largest emitter of chemical gypsum. The content of dihydrate gypsum in phosphogypsum is generally more than 80-95%, which is higher than ordinary commercial natural gypsum, and can be used as a substitute for natural gypsum to make paper-faced gypsum boards. Due to its high content of impurities, especially the high content of alkali metal ions such as potassium and sodium and residual phosphorus, it is difficult to use, or the use cost is too high. Rudang K in phosphogypsum 2 O, Na 2 When the total weight of O is more than 0.1% (dry basis), if the paper-faced gypsum board is directly produced, there will b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14C04B18/06C04B18/08
CPCY02W30/91
Inventor 叶丽君胡成军杨文斌石庆忠王言龙鲁军崔应虎罗自力
Owner TONGLING CHEM IND GRP
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