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Method for manufacturing papered gypsum board with high kalium sodium content ardealite and additive therefor

A gypsum board and additive technology, applied in the field of manufacturing gypsum board, can solve the problems of high washing cost, long process and large investment, etc., and achieve the effects of low operating cost, simple process and low investment.

Inactive Publication Date: 2010-08-11
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 cost of water washing is high, and the problem of wastewater treatment is brought about after water washing. At the same time, the free water content of the dihydrate phosphogypsum after water washing increases, which is harmful to the gypsum frying in the subsequent section. Unfavorable, it directly leads to the increase of energy consumption of phosphogypsum frying, and the cost rises accordingly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Phosphogypsum with high potassium and sodium content was taken from the phosphogypsum slag field, and it was tested to contain K 2 O, Na 2 The total amount of O is 0.11%, and it is fried into building gypsum powder according to the conventional process, and then the building gypsum powder is used as a raw material to make a plasterboard by mixing with starch aqueous solution with additives, extrusion molding, pasting and drying. Wherein, the additive polyferric sulfate is added from a starch preparation tank and mixed with the starch aqueous solution, and the added amount of the additive is 1% of the weight of the used building gypsum powder. After testing, the paper-faced gypsum board produced by this scheme has good paper-sticking performance, and there is no "frost" phenomenon on the surface of the gypsum board, and a qualified paper-faced gypsum board is obtained.

Embodiment 2

[0015] Method is with embodiment 1. Among them, phosphogypsum contains K 2 O, Na 2 The total amount of O is 0.39%, and the amount of the additive polyferric sulfate is 3% of the weight of the used building gypsum powder. After testing, the paper-faced gypsum board produced by this scheme has good paper-sticking performance, and there is no "frost" phenomenon on the surface of the gypsum board, and a qualified paper-faced gypsum board is obtained.

Embodiment 3

[0017] Method is with embodiment 1. Among them, phosphogypsum contains K 2 O, Na 2 The total amount of O is 0.65%, and the amount of the additive polyferric sulfate is 6% of the weight of the used building gypsum powder. After testing, the paper-faced gypsum board produced by this scheme has good paper-sticking performance, and there is no "frost" phenomenon on the surface of the gypsum board, and a qualified paper-faced gypsum board is obtained.

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PUM

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Abstract

The invention discloses a method of using phosphogypsum with high potassium content to produce plasterboard and a used additive. One additive of polymerized ferric chloride, polymeric ferric sulfate, polymeric ferric sulfate containing phosphoric acid or polymeric ferric sulfate containing silicate is added in phosphogypsum raw materials or building gypsum powder which is made of the phosphogypsum raw materials. The amount of the additive is 1-6 percentage of the weight of the building gypsum powder. The coagulation effect of the additive is produced in the plasterboard, which inhibits the migration of potassium and sodium ions and overcome the efflorescence phenomenon on the surface of the plasterboard. Compared with a washing-type phosphogypsum with high potassium content pretreatment process, the invention has the advantages of few investment, simple process, easy operation and low operation cost without wastewater treatment problems of the washing process.

Description

Technical field [0001] The invention relates to a production method for making gypsum board with high potassium and sodium content phosphogypsum, in particular to a method for making gypsum board with high potassium and sodium content phosphogypsum by-product of wet process phosphoric acid as raw material and the additives used. Background technique [0002] Phosphogypsum, a by-product of wet-process phosphoric acid, is the largest emitter of chemical gypsum. The content of dihydrate gypsum in phosphogypsum is generally about 80-90%, which is higher than ordinary commercial natural gypsum, and can be used as a substitute for natural gypsum to make paper-faced gypsum boards. At present, the conventional method of making gypsum board with phosphogypsum as raw material mainly includes two steps of making building gypsum powder from phosphogypsum and making gypsum board from building gypsum powder, namely: first, fry phosphogypsum into paper surface through a frying production l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B1/00C04B11/26C04B22/12C04B22/14C04B22/16
Inventor 潘建叶丽君胡成军石庆忠
Owner TONGLING CHEM IND GRP