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Zhou J.-S.,Guizhou Kailin Group Co. | Chen W.-X.,Guizhou Research Institute of Chemical Industry | Tang B.,Guizhou Research Institute of Chemical Industry
Xiandai Huagong/Modern Chemical Industry | Year: 2012

To solve silica gel blocking problems in the fluorine absorption system of wet phosphoric acid plant, ammonium fluoride is introduced into the fluorine absorption system. The results show that, the addition of ammonium fluoride solution can effectively dissolve the silica gel, thus ensure the quality of absorption solution in the circulation system, which makes the fluorine absorption system run well.


Tian J.,Guizhou Research Institute of Chemical Industry | Chen W.-X.,Guizhou Research Institute of Chemical Industry | Jiang R.-B.,Guizhou Research Institute of Chemical Industry
Xiandai Huagong/Modern Chemical Industry | Year: 2015

In order to solve technical problems of comprehensive utilization of the zinc phosphating liquid waste, the comprehensive utilization of the zinc phosphatingliquid waste slag is puts forward. It can not only reduce the consumption of natural resources but also extract phosphate, iron ion and zinc extremely, leading to sodium phosphate, iron oxide and zinc oxide products, which improves the comprehensive utilization of zinc-phosphating residue and reduces the application cost of zinc phosphating solution. ©, 2015, Xiandai Huagong/Modern Chemical Industry. All right reserved.


Chen W.-X.,Guizhou Research Institute of Chemical Industry | Tian J.,Guizhou Research Institute of Chemical Industry | Zhou C.-P.,Guizhou Research Institute of Chemical Industry
Xiandai Huagong/Modern Chemical Industry | Year: 2013

Based on the comparison of various techniques of anhydrous hydrogen fluoride from fluosilicic acid at home and abroad, a novel anhydrous hydrogen fluoride production technique by utilization of fluosilicic acid from phosphate fertilizer enterprise is proposed. Firstly, the aminolysis reaction of fluosilicic acid the ammonium fluoride solution and silica. Then, the obtained ammonium fluoride solution is turned into ammonium fluorosilicate which is prone to crystallize. The solid ammonium fluorosilicate is used to produce hydrogen fluoride and silicon tetrafluoride by reacting with concentrated sulfuric acid. Finally, the anhydrous hydrogen fluoride can be obtained by cooling the mixed acidolytic gas. The silicon tetrafluoride is return to the recycling system as well.

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