Preparation method for high-performance modified fluorgypsum

A fluorogypsum, high-performance technology, used in the preparation of high-performance modified fluorogypsum to achieve the effects of short setting time, high tensile strength and flexural strength

Active Publication Date: 2014-12-03
ANHUI JINYANG FLUORINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fluorogypsum on the market is added to products, but there are still many deficiencies in terms of tensile strength, flexural resistance, and water resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of high-performance modified fluorogypsum of the present invention comprises the following steps:

[0023] S1. Grinding and pulverizing the waste fluorine gypsum residue, sieving and performing heat treatment, the heat treatment temperature is 130° C., and the heat treatment time is 6 hours;

[0024] S2. Add 5 parts of calcium hydroxide, 0.8 part of Portland cement, 0.5 part of carbide slag, 0.8 part of oxalic acid, 0.5 part of sodium gluconate, 1.5 part of bone glue, 2 3 parts of phosphogypsum, 0.3 parts of hemihydrate gypsum, 3 parts of bauxite, 5 parts of modified rice straw fiber, 1.2 parts of fly ash, 8 parts of redispersible latex powder, 2 parts of corn straw fiber, 0.6 part of wheat straw fiber, 0.5 parts of polyvinyl alcohol, 0.5 parts of rosin emulsion, stir evenly, and let stand for 20 hours;

[0025] Wherein, the modified rice straw fiber is prepared according to the following process: cut the rice straw into small pieces of 25 mm, soak...

Embodiment 2

[0031] The preparation method of high-performance modified fluorogypsum of the present invention comprises the following steps:

[0032] S1. Grinding and pulverizing the waste fluorine gypsum residue, sieving and performing heat treatment, the heat treatment temperature is 100°C, and the heat treatment time is 10h;

[0033] S2. Add 3 parts of calcium hydroxide, 1.3 parts of Portland cement, 1.5 parts of carbide slag, 0.2 parts of oxalic acid, 1.0 parts of sodium gluconate, 0.5 parts of bone glue, and 0.5 parts of fluorine gypsum in 100 parts of S1 by weight. 1 part of phosphogypsum, 1.5 parts of hemihydrate gypsum, 1 part of bauxite, 8 parts of modified rice straw fiber, 0.8 part of fly ash, 13 parts of redispersible latex powder, 0.8 part of corn straw fiber, 1.3 part of wheat straw fiber, 0.8 part of polyvinyl alcohol, 0.1 part of rosin emulsion, stir evenly, let stand for 30h;

[0034] Wherein, the modified rice straw fiber is prepared according to the following process: c...

Embodiment 3

[0040] The preparation method of high-performance modified fluorogypsum of the present invention comprises the following steps:

[0041] S1. Grinding and pulverizing the waste fluorine gypsum residue, sieving and performing heat treatment, the heat treatment temperature is 108°C, and the heat treatment time is 8.6h;

[0042] S2. Add 4 parts of calcium hydroxide, 1.1 parts of Portland cement, 1.3 parts of carbide slag, 0.5 parts of oxalic acid, 0.8 parts of sodium gluconate, 1.1 parts of bone glue, and 1.3 parts of fluorine gypsum in 100 parts of S1 by weight. Parts of phosphogypsum, 1.2 parts of hemihydrate gypsum, 2.1 parts of bauxite, 7.0 parts of modified rice straw fiber, 1.05 parts of fly ash, 9.6 parts of redispersible latex powder, 1.4 parts of corn straw fiber, 1.1 parts of wheat straw fiber, 0.7 parts of polyvinyl alcohol, 0.35 parts of rosin emulsion, stir evenly, and let stand for 25 hours;

[0043] Wherein, the modified rice straw fiber is prepared according to th...

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PUM

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Abstract

The invention discloses a preparation method for high-performance modified fluorgypsum. The preparation method comprises the following steps of: carrying out thermal treatment after grinding, smashing and screening fluorgypsum waste residue; then, adding calcium hydroxide, portland cement, carbide slag, oxalic acid, sodium gluconate, bone glue, phosphogypsum, semi-hydrated gypsum, bauxite, modified rice straw fiber, coal ash, redispersible latex powder, corn straw fiber, wheat straw fiber, polyvinyl alcohol and rosin milk, drying and smashing, wherein the modified rice straw fiber is modified by virtue of hydrogen peroxide and sodium hydroxide; the redispersible latex powder is formed as follows: adding methyl methacrylate and butyl acrylate into ammonium chloride, sodium persulfate and lauryl sodium sulfate to react to obtain initial emulsion; and adding sodium hydroxide into the initial emulsion for alkalization, then, adding polyvinyl alcohol, and spraying and drying to obtain the redispersible latex powder. The modified fluorgypsum obtained by the method is short in setting time, high in tensile strength and breaking strength after being hydrated, and capable of changing fluorgypsum into things of value.

Description

technical field [0001] The invention relates to the technical field of gypsum, in particular to a preparation method of high-performance modified fluorogypsum. Background technique [0002] Fluorogypsum is a by-product of producing hydrogen fluoride with sulfuric acid and fluorspar. The main component is calcium sulfate. Without treatment, its activity is very low, and because sometimes H 2 SO 4 The content is very high, up to 80% to 90%, which makes the discharged fluorogypsum acidic and is a highly corrosive, toxic and hazardous waste. Untreated fluorogypsum cannot be directly disposed of, and it is also difficult to be used. And because the solubility of fluorine gypsum is low and the dissolution rate is slow, the setting time is very long, and the strength of the hydration hardening body is very small, these defects limit its application. At present, except for some fluorogypsum being used, most of it is stored as general solid waste, which not only occupies land, but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B18/24C04B24/26
CPCY02W30/91
Inventor 陈喜
Owner ANHUI JINYANG FLUORINE CHEM
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