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A kind of phosphogypsum paper-faced gypsum board and preparation method thereof

A paper-faced gypsum board, phosphogypsum technology, applied in chemical instruments and methods, hydraulic material layered products, layered products, etc., can solve the problems of small processing capacity, large primary investment, secondary pollution, etc. The effect of improved mechanical properties, improved bonding properties, and low price

Active Publication Date: 2022-01-07
BEIJING NEW BUILDING MATERIALS PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of the water washing treatment method is relatively high, the initial investment is large, and waste water will be generated, causing secondary pollution; the lime neutralization method needs pre-homogenization; other pretreatment methods also have more or less problems, such as unsatisfactory effect Small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0056] On the other hand, an embodiment of the present invention provides a method for preparing the above-mentioned phosphogypsum paper-faced gypsum board, comprising the following steps:

[0057] 1) Crushing and calcining the phosphogypsum raw meal to obtain phosphogypsum clinker;

[0058] 2) stirring the phosphogypsum clinker and konjac powder evenly to obtain the modified phosphogypsum clinker;

[0059] 3) adding binder, waterproofing agent, foaming agent and water to the modified phosphogypsum clinker, and mixing uniformly to prepare gypsum slurry;

[0060] 4) Pour the gypsum slurry on the protective paper, lap and stick it firmly to form a wet board;

[0061] 5) After the wet board is solidified, enter the dryer, and the wet board after drying is the gypsum board.

[0062] In the embodiment of the present invention, the calcination temperature in step 1) is 140-180°C, and the calcination time is 1-3h.

[0063] In the embodiment of the present invention, the drying des...

Embodiment 1

[0067] In the present embodiment, the soluble phosphorus content in the phosphogypsum raw meal is 10000mg / kg; F - The content is 400mg / kg; Mg 2 + The content is 1000mg / kg; K + The content is 1200mg / kg; Na + The content is 600mg / kg.

[0068] The particle size of raw konjac flour is 200 mesh; the viscosity of konjac flour is 28000mPa·s; the pH value of 1wt.% aqueous solution is 5; the content of glucomannan is 85wt.%.

[0069] The raw material binder is modified corn starch;

[0070] The raw material waterproofing agent is emulsified paraffin;

[0071] The raw material foaming agent is selected from the anionic surfactant sodium lauryl sulfate and the foam stabilizer polyvinyl alcohol, and the mass ratio of the anionic surfactant to the foam stabilizer is 1:0.8; the anionic surfactant is purchased from Jinan Huanzheng Chemical Co., Ltd., foam stabilizer purchased from Anqiu Haisheng Chemical Co., Ltd., 1788 type;

[0072] In this embodiment, the specific steps for prepari...

Embodiment 2

[0079] In the present embodiment, the soluble phosphorus content in the phosphogypsum raw meal is 8000mg / kg; F - The content is 700mg / kg, Mg 2+ The content is 800mg / kg, K + The content is 1400mg / kg, Na + The content is 700mg / kg.

[0080] The particle size of raw konjac flour is 120 mesh; the viscosity of konjac flour is 23000mPa·s; the pH value of 1wt.% aqueous solution is 6; the content of glucomannan is 80wt.%.

[0081] The raw material binder is modified potato starch;

[0082] The raw material waterproofing agent is emulsified paraffin;

[0083] The raw material foaming agent is selected from the anionic surfactant sodium dodecylbenzenesulfonate and the foam stabilizer silicone resin polyether emulsion, and the mass ratio of the anionic surfactant to the foam stabilizer is 1:0.9; the anionic surface active The agent was purchased from Jinan Yuanlian Chemical Co., Ltd., and the foam stabilizer was purchased from Longkou Damai Chemical Co., Ltd.;

[0084] In this embod...

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Abstract

The invention provides a phosphogypsum paper-faced gypsum board and a preparation method thereof. The core material of the gypsum board includes phosphogypsum clinker and konjac powder. Optionally, the board core raw material includes phosphogypsum clinker, konjac flour, binder, waterproofing agent, foaming agent and water. The preparation method comprises: first crushing and calcining the phosphogypsum raw material to obtain the phosphogypsum clinker; secondly stirring the phosphogypsum clinker and konjac powder evenly to obtain the modified phosphogypsum clinker; and adding the modified phosphogypsum clinker Add binder, waterproofing agent, foaming agent and water, and mix evenly to obtain gypsum slurry; then pour the gypsum slurry on the protective paper to form a wet board; finally, after the wet board After solidification, it enters the dryer, and the preparation of phosphogypsum paper-faced gypsum board is completed after drying. The paper-faced gypsum board prepared by the invention suppresses the migration of alkali metal ions such as potassium and sodium in the phosphogypsum, thereby greatly improving the bonding performance between the phosphogypsum and the face-protecting paper of the gypsum board.

Description

technical field [0001] This article relates to new building material technology, relates to a phosphogypsum plasterboard and its preparation method, especially a phosphogypsum pretreatment method suitable for the production of plasterboard. Background technique [0002] Phosphogypsum is a by-product of the phosphoric acid and phosphate fertilizer industries. For every ton of phosphoric acid produced, about 4.5-5.5 tons of phosphogypsum are produced, and the actual amount is about 7 tons. Phosphogypsum discharged by phosphate fertilizer chemical companies exceeds 10 million tons every year, with a cumulative discharge of nearly 100 million tons. The main component of phosphogypsum is calcium sulfate, and it also contains undecomposed phosphate rock, unwashed phosphoric acid, calcium fluoride, iron, aluminum compounds, acid insoluble matter, organic matter and other impurities, which seriously affect the quality of phosphogypsum. use. At present, the vast majority of phospho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14B32B13/08B32B37/00C04B24/38C04B11/26
CPCC04B28/143B32B13/08B32B37/00C04B24/38C04B11/26C04B2111/0062C04B2103/65C04B2103/402C04B2103/48
Inventor 王莹王鹏起谭丹君尹东杰何亮简铭樊惠云
Owner BEIJING NEW BUILDING MATERIALS PLC
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