A rapid preparation process of nano-scale modified anhydrous calcium sulfate

Anhydrous calcium sulfate, preparation technology, applied in the direction of nanotechnology, calcium/strontium/barium sulfate, etc., can solve the problem of reducing the production of light calcium carbonate mining, reducing natural high-quality gypsum mining, poor interface bonding performance, etc. problems, to achieve broad industrial application prospects, good economic benefits, and the effect of reducing mining

Active Publication Date: 2019-03-12
泉州科维嘉电力有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the above situation, there is an urgent need for a new process, which can not only use phosphogypsum as the main raw material, increase its added value, expand its market application field, but also prepare a kind of phosphogypsum that can replace light calcium carbonate, calcined kaolin, Lide Powder and some titanium dioxide waste utilization new process products, in order to reduce the production of light calcium carbonate, reduce the mining of natural high-quality calcium ore, reduce the mining of natural high-quality gypsum, and overcome the existing problems of anhydrous calcium sulfate and polymer materials Defects of poor interface bonding performance and poor mechanical properties of materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This example is to provide a rapid preparation process of nano-scale modified anhydrous calcium sulfate. The process mainly includes preparing raw materials→preparing anhydrite slurry→preparing anhydrous calcium sulfate suspension→preparing nano-scale modified anhydrous calcium sulfate Calcium sulfate in four steps.

[0029] Specifically, the operating method of the preparation process is as follows:

[0030] (1) Get the raw materials by the following parts by weight: 200 parts of phosphogypsum with a free water rate of 20%, 80 parts of concentrated sulfuric acid with a concentration of 98.1%, 5 parts of industrial sodium persulfate, 15 parts of titanate coupling agent, ten parts dioxane

[0031] 5 parts of sodium phenyl sulfonate, 0.3% of anti-stripping agent;

[0032] Wherein, the phosphogypsum composition is shown in the following table:

[0033] name

loss

SiO 2

al 2 o 3

Fe 2 o 3

CaO

MgO

SO 3

P 2 o 5

F

...

Embodiment 2

[0042] (1) Get raw materials according to the following parts by weight: 220 parts of phosphogypsum with a free water rate of 25%, 100 parts of concentrated sulfuric acid with a concentration of 95%, 10 parts of hydrogen peroxide, 20 parts of titanate coupling agent, 10 parts of ethylene glycol parts, anti-stripping agent 0.5%;

[0043] Wherein, the phosphogypsum composition is the same as in Example 1.

[0044](2) Preparation of anhydrite slurry: put the concentrated sulfuric acid into an electric mixer lined with polytetrafluoroethylene, then slowly add deionized water to it under stirring conditions to dilute the concentrated sulfuric acid to a mass concentration of 70%, and then after adding phosphogypsum and surfactant into the diluted concentrated sulfuric acid, it is placed under negative pressure conditions to carry out decrystallization water reaction; the stirring speed of the electric stirrer is set to 80r / min, and then After raising the temperature in the electric...

Embodiment 3

[0048] (1) Get the raw materials by the following parts by weight: 210 parts of phosphogypsum with a free water rate of 20%, 90 parts of concentrated sulfuric acid with a concentration of 97%, 8 parts of industrial potassium permanganate, 18 parts of titanate coupling agent, 8 parts of mixture of ethylene glycol and sodium dodecylbenzene sulfonate, 0.4% of anti-stripping agent;

[0049] Wherein, the phosphogypsum composition is the same as in Example 1.

[0050] (2) Preparation of anhydrite slurry: put the concentrated sulfuric acid into an electric mixer lined with polytetrafluoroethylene, then slowly add deionized water to it under stirring conditions to dilute the concentrated sulfuric acid to a mass concentration of 65%, and then add phosphogypsum and surfactant to the diluted concentrated sulfuric acid, put it under negative pressure conditions, and carry out decrystallization water reaction;

[0051] Set the stirring rate of the electric stirrer to 80r / min, then raise t...

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Abstract

The invention discloses a rapid preparation process of nano-level modified anhydrous calcium sulfate. The process mainly comprises four steps of preparation of raw materials, preparation of anhydrite slurry, preparation of anhydrous calcium sulfate suspension and preparation of the nano-level modified anhydrous calcium sulfate. The preparation process is simple and convenient to operate and can rapidly prepare the modified anhydrous calcium sulfate. Furthermore, the content of nano-level particles in the obtained modified anhydrous calcium sulfate is greater than 80 percent, and the whiteness is greater than 90 percent; the nano-level modified anhydrous calcium sulfate is high in surface activity, easily bonded with a polymer, high in mechanical property and wide in application prospect.

Description

technical field [0001] The invention relates to anhydrous calcium sulfate, in particular to a rapid preparation process of nano-scale modified anhydrous calcium sulfate. Background technique [0002] Wet-process phosphoric acid production uses phosphate rock and concentrated sulfuric acid as raw materials, and a large amount of phosphogypsum (CaSO4·2H2O) is produced by-product during the reaction to generate phosphoric acid. The production of one ton of phosphoric acid (calculated as P2O5) can produce about 5-6 tons of by-product phosphogypsum. At present, the annual discharge of phosphogypsum by wet-process phosphoric acid enterprises in my country is about 50 million tons, and the stock of its by-product phosphogypsum is 250-300 million tons. The hidden danger is huge; since phosphogypsum contains a variety of impurities (such as phosphoric acid and phosphate, eutectic phosphorus, fluoride, organic impurities and metal salts) in addition to calcium sulfate, which affects th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46B82Y40/00
CPCC01F11/46C01P2004/64C01P2006/65
Inventor 黄巧香
Owner 泉州科维嘉电力有限公司
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