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
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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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