Processing Technogenic Raw Materials-Phosphorus Slags with the Production of Precipitated Nanosilica and Simultaneous Recovery of Valuable Components

Abstract:

The paper provides a flow sheet of the phosphorus slag processing to produce precipitated silica (white soot). The process conditions for opening phosphorus slag at the I stage of leaching have been selected: the nitric acid concentration is 3.5 mol/dm³; the ratio S:L = 1:3.5; the temperature is 60 oС; and the process duration is 1 hour. The parameters of the white soot production II stage have been determined: the HNO₃ concentration is 6.5 mol/dm³; the ratio S:L = 1:3.5; the temperature is 50 oС; and the process duration is 1 hour. The temperature effect on the white soot structure and the specific surface have been established. At optimal process parameters, the white soot batches have been obtained with the main SiO₂ component content of 88.2 and 90.5 %, and a specific surface of 170 and 182 m²/g, respectively. The through recovery of silicon into a commercial product is 98.0 % of its initial content in slag.

• Periodical: Solid State Phenomena (Volume 316)
• Pages: 637-642
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.316.637
• Online since: April 2021
• Authors: Yelena G. Bochevskaya*, Zaure B. Karshigina, Aynash S. Sharipova
• Keywords: Leaching, Phosphorus Slag, Precipitated Silicon Dioxide, Rare Earth Metals, Specific Surface, Technology, White Soot

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