Resource-Saving Technology for Processing By-Products of the Wet Phosphoric Acid Process – Phosphogypsym and Fluosilicic Acid to Produce Ammonium Sulfate
April 29-May 4, 2018
At present time, many producers of phosphate fertilizers faced with the challenge of processing and recycling of fluosilicic acid solutions (FSA), obtained in the process of absorption fluorine -containing gases. It is a pollutant with a primary concern and cannot be landfilled without treatment. Existing best available techniques for processing FSA involves production of silicofluoride and fluoride salts which market is very limited. As a result, the acid neutralized with lime. This method of treatment ultimately increases the amount of solid waste sent for storage. А better environmental alternative of this method is the use of technological solutions, which can allow processing FSA with production of substances demanded by the chemical industry. NIUIF has developed a technique (Pat. RU 2462419) of co-processing by-products phosphogypsum and FSA with production of ammonium sulfate without intermediate separation of silica according to the process block diagram shown in Figure 1.
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Maksim Tcikin and Andrei Norov, "Resource-Saving Technology for Processing By-Products of the Wet Phosphoric Acid Process – Phosphogypsym and Fluosilicic Acid to Produce Ammonium Sulfate" in "Beneficiation of Phosphates VIII", Dr. Patrick Zhang, Florida Industrial and Phosphate Research Institute, USA Professor Jan Miller, University of Utah, USA Professor Laurindo Leal Filho, Vale Institute of Technology (ITV), Brazil Marius Porteus, Foskor-Mining Division, South Africa Professor Neil Snyders, Stellenbosch University, South Africa Mr. Ewan Wingate, WorleyParsons Services Pty Ltd., Australia Prof. Guven Akdogan, Stellenbosch University, South Africa Eds, ECI Symposium Series, (2018). http://dc.engconfintl.org/phosphates_viii/43