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A method of redispersible latex powder modified fluorogypsum

A technology of redispersed latex powder and fluorine gypsum, applied in the field of gypsum, can solve the problems of long setting time, slow dissolution rate, low strength of hydration hardened body, etc., and achieves optimized modification process, short setting time and excellent tensile strength. Effect

Active Publication Date: 2016-04-13
ANHUI JINYANG FLUORINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main component of fluoride gypsum is calcium sulfate, and contains some calcium fluoride and other fluorides, and sometimes H 2 SO 4 The high content makes the discharged fluorine gypsum acidic, which is a highly corrosive toxic and hazardous waste. Untreated fluorine gypsum cannot be disposed of directly, and it is 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 also pollutes water bodies and poses a threat to the natural environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The method for redispersible latex powder modified fluorogypsum of the present invention comprises the following steps:

[0026] S1. Grinding and pulverizing the fluorogypsum, sieving and then performing heat treatment, the heat treatment temperature is 148°C, and the heat treatment time is 5.0h;

[0027] S2. Add 4.1 parts of calcium hydroxide, 1.1 parts of alum, 1.4 parts of phosphogypsum, and 2.1 parts of bauxite to 100 parts of heat-treated fluorogypsum in S1 in parts by weight, stir evenly, and let stand for 20 hours to perform a chemical modification;

[0028] S3. Add 7 parts of redispersible latex powder, 1.0 part of fly ash, 0.9 part of cement, 1.6 parts of corn straw fiber, 1.2 parts of wheat straw fiber, 0.6 part of Polyvinyl alcohol, 0.27 part of rosin emulsion, 0.5 part of sodium citrate carry out secondary chemical modification;

[0029] Wherein, the preparation process of said redispersible latex powder being polyacrylate redispersible latex powder is as f...

Embodiment 2

[0034] The method for redispersible latex powder modified fluorogypsum of the present invention comprises the following steps:

[0035] S1. Grinding and pulverizing the fluorine gypsum, sieving and performing heat treatment, the heat treatment temperature is 135°C, and the heat treatment time is 6h;

[0036] S2. Add 5 parts of calcium hydroxide, 1.5 parts of alum, 0.5 parts of phosphogypsum, and 3 parts of bauxite to 100 parts of heat-treated fluorogypsum in S1 in parts by weight, stir evenly, and let stand for 15 hours to perform a chemical modification;

[0037] S3. Add 5 parts of redispersible latex powder, 0.5 part of fly ash, 1.5 parts of cement, 2.5 parts of corn straw fiber, 0.5 part of wheat straw fiber, 0.2 part of Polyvinyl alcohol, 0.1 part of rosin emulsion, 0.7 part of sodium citrate carry out secondary chemical modification;

[0038] Wherein, the preparation process of said redispersible latex powder being polyacrylate redispersible latex powder is as follows: ...

Embodiment 3

[0043] The method for redispersible latex powder modified fluorogypsum of the present invention comprises the following steps:

[0044] S1. Grinding and pulverizing the fluorine gypsum, sieving and performing heat treatment, the heat treatment temperature is 160°C, and the heat treatment time is 4h;

[0045] S2. Add 3 parts of calcium hydroxide, 1.5 parts of alum, 2 parts of phosphogypsum, and 1 part of bauxite to 100 parts of heat-treated fluorogypsum in S1 by weight, stir evenly, and let stand for 30 hours to perform a chemical modification;

[0046] S3. Add 8 parts of redispersible latex powder, 1.3 parts of fly ash, 0.2 parts of cement, 0.5 parts of corn straw fiber, 1.5 parts of wheat straw fiber, 1 part of Polyvinyl alcohol, 0.5 part of rosin emulsion, 0.2 part of sodium citrate carry out secondary chemical modification;

[0047] Wherein, the preparation process of said redispersible latex powder being polyacrylate redispersible latex powder is as follows:

[0048] A. ...

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Abstract

The invention discloses a method for modifying fluorine gypsum by using redispersible latex powder. The method comprises the following steps: grinding, crushing and sieving fluorine gypsum, and then performing heat treatment at 135-160 DEG C for 4-6 hours; adding calcium hydroxide, alum, phosphorus gypsum and bauxite into fluorine gypsum which is subjected to heat treatment so as to perform primary chemical modification; adding the redispersible latex powder, pulverized fuel ash, cement, corn straw fiber, wheat straw fiber, polyvinyl alcohol, a rosin emulsion and sodium citrate into fluorine gypsum which is subjected to primary chemical modification so as to perform secondary chemical modification, wherein the redispersible latex powder is polyacrylate redispersible latex powder, and is prepared through the following steps: preparing an initial emulsion from ammonium chloride, ammonium persulfate, sodium dodecyl benzene sulfonate, methyl methacrylate and butyl acrylate, then adding calcium hydroxide and polyvinyl alcohol, and performing spray drying. The fluorine gypsum modified by the method disclosed by the invention is short in coagulation time and high in hydration and hardening strength; meanwhile, by adopting the method disclosed by the invention, the fluorine gypsum can be changed into treasure from waste.

Description

technical field [0001] The invention relates to the technical field of gypsum, in particular to a method for modifying fluorogypsum with redispersible latex powder. Background technique [0002] Fluorogypsum is the main by-product in the production process of hydrofluoric acid and sodium fluoroaluminate, mainly produced in inorganic fluoride and organic fluoride production plants and other hydrofluoric acid production plants. About 3.6t of anhydrous fluorogypsum is produced for every 1t of hydrofluoric acid produced. The main component of fluoride gypsum is calcium sulfate, and contains some calcium fluoride and other fluorides, and sometimes H 2 SO 4 The high content makes the discharged fluorine gypsum acidic, which is a highly corrosive toxic and hazardous waste. Untreated fluorine gypsum cannot be disposed of directly, and it is 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, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/26
Inventor 陈喜
Owner ANHUI JINYANG FLUORINE CHEM