Pre-activation of nepheline before the enrichment

N. Akhmadiyeva; R.A. Abdulvaliyev; A. Akcil; A.I. Manapova

doi:10.31643/2023/6445.43

Authors

N. Akhmadiyeva Institute of Metallurgy and Beneficiation; Satbayev University https://orcid.org/0000-0003-3154-9816
R.A. Abdulvaliyev Institute of Metallurgy and Beneficiation; Satbayev University
A. Akcil Suleyman Demirel University
A.I. Manapova Institute of Metallurgy and Beneficiation; Satbayev University

DOI:

https://doi.org/10.31643/2023/6445.43

Keywords:

nepheline, enrichment, preliminary activation, silica, alumina

Abstract

Due to limited reserves of bauxite, nepheline can be used in the industrial production of alumina in Kazakhstan. The most promising deposit is the nepheline syenites of the Kubasadyr deposit. Currently, there is no effective technology for processing nepheline ores. High energy intensity, capital intensity and significant emissions into the atmosphere are the main drawbacks of the conventional technology of nepheline ore processing by sintering method. Efficient hydrochemical processing of nepheline requires pre-enrichment with the separation of a part of silica. According to the existing technology of chemical enrichment in an alkaline solution at a temperature of 280⁰С, the silica extraction degree is no more than 36%. A pre-roasting at 500⁰C is used to increase the extraction rate of silica and this process permits an increase in the extraction rate to 65%. The paper presents the results of the chemical activation of nepheline syenites in a solution of sodium hydrogen carbonate. The optimum conditions of activation are determined. Activation at a temperature of 280 ⁰C resulted in a change in the phase composition of the feedstock and increases the degree of silica extraction up to 65,5%. The results obtained showed the possibility in principle of using hydrochemical enrichment technology for the resulting high-quality nepheline concentrate and replacing the energy-intensive roasting process.

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Author Biographies

N. Akhmadiyeva, Institute of Metallurgy and Beneficiation; Satbayev University

PhD, Researcher of the alumina and aluminium laboratory of the Institute of Metallurgy and Ore Beneficiation, Satbayev University, Shevchenko str., 29/133, 050010, Almaty, Kazakhstan.

R.A. Abdulvaliyev, Institute of Metallurgy and Beneficiation; Satbayev University

Candidate of Technical Sciences, head of the laboratory of alumina and aluminium of the Institute of Metallurgy and Ore Beneficiation, Satbayev University, Shevchenko str., 29/133, 050010, Almaty, Kazakhstan.

A. Akcil, Suleyman Demirel University

PhD, Professor, Head of the Mineral-Metal Recovery and Recycling MMR&R Research Group, Mineral Processing Division, Department of Mining Engineering, SDU, TR32260, Isparta, Turket.

A.I. Manapova, Institute of Metallurgy and Beneficiation; Satbayev University

Master of Technical Sciences, junior researcher of the laboratory of alumina and aluminium of the Institute of Metallurgy and Ore Beneficiation, Satbayev University, Shevchenko str., 29/133, 050010, Almaty, Kazakhstan.

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