Preparation method of phosphogypsum recrystallized wall material

A technology for wall materials and phosphogypsum, which is applied in the preparation of wall materials and phosphogypsum recrystallized wall materials, and can solve the problems of high cost, pollution, and high energy consumption

Inactive Publication Date: 2011-12-14
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problems of pollution, high energy consumption, and high cost in the prior art, the present invention provides a method for preparing a phosphogypsum recrystallized wall material, using natural mineral gypsum and industrial by-product gypsum to produce gypsum as wall material, Achieved through the following technical solutions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A. Mix 1 ton of phosphogypsum with 20kg of sodium naphthalenesulfonate, CaO and polyvinyl alcohol;

[0023] B. Ball mill the mixture to a fineness of -200 mesh to achieve intimate mixing of phosphogypsum and additives;

[0024] C. The ground mixture is mixed with 200kg of water, and then bricks are formed, and the finished phosphogypsum wall is obtained by constant temperature and pressure curing.

Embodiment 2

[0026] A. Mix 1 ton of phosphogypsum with 150kg of sodium naphthalenesulfonate, Ca(OH) 2 mixed with polyvinyl alcohol;

[0027] B. The mixture is vertically milled to a fineness of -200 mesh to achieve close mixing of phosphogypsum and additives;

[0028] C. The ground mixture is mixed with 250kg of water, and then extruded, and the finished phosphogypsum wall is obtained by constant temperature and pressure curing.

Embodiment 3

[0030] A. Mix 1 ton of phosphogypsum with 100kg of sodium naphthalenesulfonate, Ca(OH) 2 mixed with polyvinyl alcohol;

[0031] B. Roller mill the mixture to a fineness of -200 mesh to achieve intimate mixing of phosphogypsum and additives;

[0032] C. The ground mixture is mixed with 150kg of water, and then the aerated block is formed, and the finished phosphogypsum wall is obtained by constant temperature and pressure curing.

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Abstract

The invention provides a preparation method of an ardealite recrystallization wall material. The method comprises steps of: mixing ardealite and additives in a mass ratio of 1:0.02-0.15; grinding the mixture to -200 mesh to realize intimate mixing of the ardealite and the additives; mixing the ground mixture and water in a mass ratio of 1:0.15-0.25, blending well, moulding and maintaining under normal temperature and normal pressure to obtain an ardealite wall finished product. According to the method, cost of binder is saved, and a calcination process and corresponding pollution are avoided. More importantly, the recrystallization solidified wall material has more stable performance and overcomes a problem of expansion and cracking of a current similar burn-free ardealite brick during usage, because a phenomenon of an unstable long-term wall material endurance, caused by expansion of sulphate aluminium after addition of cement, is avoided.

Description

technical field [0001] The invention relates to a preparation method of a wall material, in particular to a preparation method of a phosphogypsum recrystallized wall material, and belongs to the technical field of building materials. Background technique [0002] The preparation of wall materials from phosphogypsum is one of the important methods to utilize phosphogypsum in large quantities. The preparation of existing gypsum (including natural mineral gypsum and industrial by-product gypsum) wall materials mainly has the following three methods: [0003] (1) Through calcination, the original dihydrate gypsum is heated at high temperature into hemihydrate gypsum, and then prepared into slurry with water and shaped to make the hemihydrate gypsum re-turn into dihydrate gypsum and solidify, thereby producing a wall material with a certain strength. [0004] (2) Add organic or inorganic cementitious materials (such as resin, cement, etc.) to phosphogypsum as a binder to produce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
Inventor 李建锡余苏宁平何建安吴向东刘朝伟
Owner KUNMING UNIV OF SCI & TECH
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