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Phosphogypsum self-leveling material

A phosphogypsum and self-leveling technology, which is applied in the field of building materials, can solve the problems that cannot meet the requirements of gypsum-based self-leveling materials, and achieve the effects of low shrinkage deformation, high strength and good fluidity

Active Publication Date: 2012-08-22
徐迅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent 200510120515.6 and Chinese patent 200510072440.9 are both gypsum-based self-leveling materials, but they use gypsum mineral powder. If phosphogypsum is used according to its proportion, it cannot meet the requirements of gypsum-based self-leveling materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0036] Embodiment 2: Phosphogypsum self-leveling material, the weight percentage of each component is as follows:

[0037] Modified phosphogypsum 20%,

[0038] P.O.42.5R (ordinary Portland cement) 3%,

[0039] β hemihydrate gypsum 40%,

[0040] Anhydrite 10%,

[0041] Redispersible latex powder 3.5%,

[0042] Defoamer 0.2%,

[0043] Polycarboxylate superplasticizer 0.4%,

[0044] Cellulose ether 0.05%,

[0045] Citric acid 0.1%,

[0046] Dry sand 22.75%;

[0047] Among them: modified phosphogypsum is dehydrated phosphogypsum at a temperature of 170°C±10°C for 250 minutes, and ground into a fine powder of 0.3mm or less; the particle size of quartz sand is controlled at 70-140 mesh. Prepare the self-leveling material according to the weight percentage specified above, add water according to the water-cement ratio of 0.235 and mix well before construction. The basic properties of this formula are: 30min fluidity loss 2mm, initial setting time 2.0h, final setting time 3.9...

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Abstract

The invention relates to a gypsum-based self-leveling material prepared by phosphogypsum, which comprises the following components by weight: 10-30% of modified phosphogypsum, 1-5% of cement, 30-60% of semi-hydrated gypsum, 0-15% of anhydrite, 2.0-4.0% of redispersible emulsion powder, 0.03-0.06% of water retaining agents, 0.10-0.30% of antifoaming agents, 0.2-1.0% of water reducing agents, 0.03-0.12% of retarders, and 20-30% of fine sand. According to the invention of the gypsum-based self-leveling material prepared by using phosphogypsum as a raw material, waste phosphogypsum can be made full use of; severe pollution of soil, water systems and atmosphere and land resource waste caused by phosphogypsum exposed stacking and discharging into the sea are reduced; the cost for the gypsum-based self-leveling material is reduced; and the prepared the gypsum-based self-leveling material has the characteristics of high strength, good fluidity, and low shrinkage deformation.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a gypsum-based self-leveling material, in particular to a gypsum-based self-leveling material prepared by using phosphogypsum. Background technique [0002] Phosphogypsum is a kind of industrial by-product gypsum, which is the waste residue discharged from the production of phosphoric acid in phosphate fertilizer plants. Every ton of phosphate fertilizer produces an average of 3.75 tons of phosphogypsum. In recent years, the discharge of phosphogypsum in our country has been increasing day by day. At present, most of the acidic powdery materials are stacked in the open air or dumped into the sea. This will obviously cause serious pollution of soil, water system and atmosphere, and bring great challenges to environmental protection. Huge pressure, and a waste of land resources. At present, the total annual output of wet-process phosphoric acid in the world is about 260 ...

Claims

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Application Information

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IPC IPC(8): C04B28/14
Inventor 徐迅卢忠远
Owner 徐迅
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