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Method for preparing nanometer calcium sulfate

A technology of nano-calcium sulfate and calcium sulfate, applied in the direction of calcium/strontium/barium sulfate, silicon halide compound, fluorine/hydrogen fluoride, etc., can solve the problem that calcium sulfate cannot be used, and avoid thermal decomposition, improve conversion rate, and react Uniform effect

Active Publication Date: 2014-12-17
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantage that the by-product calcium sulfate cannot be used after extracting fluorine resources from the above-mentioned calcium fluorosilicate, and to provide a method for preparing nano-calcium sulfate with high product purity, low production cost and high quality requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 182.1g of calcium fluorosilicate into a reactor lined with polytetrafluoroethylene; heat the reactor to 80°C; turn on the negative pressure system to make the reaction system form a slight negative pressure of -0.01MPa; Add 1.8 grams of sodium dodecylbenzenesulfonate and 0.9 grams of ethylene glycol as a surfactant; add 392.3 g of sulfuric acid with a mass concentration of 50% in the reactor; the reaction temperature is controlled at 80 ° C, and the reaction is carried out for 60 minutes; The gas is separated, dried, rectified and compressed to obtain anhydrous hydrogen fluoride products and silicon tetrafluoride products; the calcium sulfate generated by the reaction is taken out, and the calcium sulfate is washed several times to wash out the excess sulfuric acid and the dissolved sulfuric acid The hydrofluoric acid in the mixture was used to obtain calcium sulfate filter cake, and the washed calcium sulfate filter cake was dried at 100°C and then calcined at 400...

Embodiment 2

[0020] Weigh 182.0g of calcium fluorosilicate into a reactor lined with polytetrafluoroethylene; heat the reactor to 80°C; turn on the negative pressure system to make the reaction system form a slight negative pressure of -0.01MPa; Add 1.8 grams of sodium dodecylbenzenesulfonate and 0.9 grams of ethylene glycol as a surfactant; add 300.5 g of sulfuric acid with a mass concentration of 65% in the reactor; the reaction temperature is controlled at 90 ° C, and the reaction is carried out for 80 minutes; The gas is separated, dried, rectified and compressed to obtain anhydrous hydrogen fluoride products and silicon tetrafluoride products; the calcium sulfate generated by the reaction is taken out, and the calcium sulfate is washed several times to wash out the excess sulfuric acid and the dissolved sulfuric acid The hydrofluoric acid in the mixture was used to obtain calcium sulfate filter cake. After washing, the calcium sulfate filter cake was dried at 105°C and then calcined at...

Embodiment 3

[0022] Weigh 182.3g of calcium fluorosilicate into a reactor lined with polytetrafluoroethylene; heat the reactor to 80°C; turn on the negative pressure system to make the reaction system form a slight negative pressure of -0.01MPa; Add 1.8 grams of sodium dodecylbenzenesulfonate and 0.9 grams of ethylene glycol as a surfactant; add 288.9 g of sulfuric acid with a mass concentration of 78% to the reactor; the reaction temperature is controlled at 100 ° C, and the reaction is carried out for 90 minutes; The gas is separated, dried, rectified and compressed to obtain anhydrous hydrogen fluoride products and silicon tetrafluoride products; the calcium sulfate generated by the reaction is taken out, and the calcium sulfate is washed several times to wash out the excess sulfuric acid and the dissolved sulfuric acid The hydrofluoric acid in the mixture was used to obtain calcium sulfate filter cake. After washing, the calcium sulfate filter cake was dried at 110°C and then calcined a...

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Abstract

The invention discloses a method for preparing nanometer calcium sulfate. The method comprises the following steps: putting calcium fluosilicate in a reactor lined with polytetrafluoroethylene and heating to 80-110 DEG C; starting a negative-pressure system; sequentially adding sodium dodecyl benzene sulfonate and ethylene glycol into the reactor to serve as surfactants; adding sulfuric acid into the reactor and controlling the molar ratio of the sulfuric acid to the calcium fluosilicate between 2:1 and 2.5:1; reacting for 60-120 minutes; controlling the reaction temperature between 80 DEG C and 110 DEG C; separating, drying, rectifying and concentrating the gas generated by the reaction to obtain an anhydrous hydrogen fluoride product and a silicon tetrafluoride product; and finally, taking out calcium sulfate generated by the reaction, washing, drying and calcining to obtain a nanometer calcium sulfate product. The nanometer calcium sulfate product obtained by adopting the method is high in purity and meets the high quality requirement.

Description

technical field [0001] The invention relates to sulfur compounds, in particular to a method for preparing nanometer calcium sulfate. Background technique [0002] Calcium sulfate is an important chemical raw material. In addition to being used in large quantities as building materials and cement raw materials, it is also widely used in fertilizers, pesticides, textiles, food, medicine, and daily chemicals. In areas lacking sulfur resources, Calcium sulfate can also be used as a raw material for the production of sulfuric acid and ammonium sulfate. Nano-calcium sulfate is an indispensable raw material in industries such as rubber, plastics, papermaking, coatings, and paints. The above industries have high requirements on the purity and particle size of calcium sulfate. A large amount of calcium sulfate is produced in the process of phosphate fertilizer production because it contains a certain amount of impurities such as silica, magnesium salt and fluorine salt, so that the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46C01B7/19C01B33/107
Inventor 李子燕解田杨丽萍史联军刘松林隋岩峰刘旭
Owner WENGFU (GRP) CO LTD