Conditions of nitric acid treatment of phosphorus slag for rems recovery and production of precipitated silicon dioxide

A. Akcil; Z.B. Karshigina; Ye.G. Bochevskaya; Z.S. Abisheva

doi:10.31643/2018/6445.4

Authors

A. Akcil Suleyman Demirel University
Z.B. Karshigina “Institute of Metallurgy and Ore Beneficiation” JSC
Ye.G. Bochevskaya “Institute of Metallurgy and Ore Beneficiation” JSC
Z.S. Abisheva Satbayev University

DOI:

https://doi.org/10.31643/2018/6445.4

Keywords:

phosphorus slag, rare earth metals, leaching, kinetics, silicon-containing cake, recovery, purification.

Abstract

Phosphorus slag is the most heavy-tonnage waste of yellow phosphorus production, which is stored in the dump fields for many years causing ecological problems in the regions. One of the relevant and priority directions is rare-earth metals (REMs) production, presence of which in the phosphorus slags allows considering the latter as an acceptable raw material source. Phosphorus slags contain about 30–40 wt% of silicon dioxide, therefore they can serve as a source of production of precipitated silicon dioxide highly required in different industries. The purpose of this work is studying the conditions for REMs recovery from phosphorus slag and further processing of silicon-containing cake to improve a quality of the obtained products.The work shows results of researches on the phosphorus slags’ chemical and phase compositions identification, processes of leaching of phosphorus slag and the obtained silicon-containing cake by nitric acid. Instrumental and chemical methods of phosphorus slag content analysis give following data. It consists of 90–92 % of pseudowollastonite α-CaSiO₃, and also there are gyrolite Ca₄(H₂O)₄[Si₆O₁₅](OH)₂, small amounts of serpentine Mg₆[Si₄O₁₀](OH)₈, hydrated calcium aluminosilicate impurities CaO∙2Al₂O₃∙2SiO₂∙H₂O, quartz α-SiO₂, calcite CaCO₃, hematite Fe₂O₃, iron phosphate FePO₄ and metallic iron with manganese impurity. As a result of kinetic studies of leaching process of phosphorus slag, the apparent activation energy for ΣREMs, calcium, aluminum and iron was determined which amounted to 4.31, 8.53, 7.43 and 12.31 kJ/mol, respectively. This, in combination with value of the Pilling-Bedward Criterion C_P-B = 1.1 for orthosilicate acid H₄SiO₄, indicates that the process is characterized by an intradiffusion region. With a decrease in temperature of nitric acid treatment from 90 to 70 °C, purification degree of precipitated silicon dioxide from iron and aluminium impurities increases. Results of the experimental data will serve as a basis for development of the technology for complex processing of production waste of phosphorus industry and for improving quality of obtained products as REMs concentrate and precipitated silicon dioxide.

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Author Biographies

A. Akcil, Suleyman Demirel University

Ph.D., Professor, Professor of Suleyman Demirel University, Engineering Faculty, Isparta, Turkey.

Z.B. Karshigina, “Institute of Metallurgy and Ore Beneficiation” JSC

Ph.D., Senior Researcher, Institute of Metallurgy and Ore Benefication, Laboratory of rare scattered elements, Almaty, Kazakhstan.

Ye.G. Bochevskaya, “Institute of Metallurgy and Ore Beneficiation” JSC

Ph.D., Associate Professor, Acting head of the laboratory, Institute of Metallurgy and Ore Benefication, Laboratory of rare scattered elements, Almaty, Kazakhstan.

Z.S. Abisheva, Satbayev University

Dr.Sci.Tech., Professor, Academician of NAS of RK, Director, Mining and Metallurgical Institute named after O. Baikonurov of “KazNRTU named after K.I. Satpayev” NJSC, Almaty, Kazakhstan.

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