Optimizing Technological Parameters for Chromium Extraction from Chromite Ore Beneficiation Tailings

Akhmadiyeva N. Abdulvaliyev R. Gladyshev S. Sukurov B. Abikak Y. Manapova A. Bakhytuly N.
June 2025 Multidisciplinary Digital Publishing Institute (MDPI)

Minerals
2025 #15 Issue 6

This study focuses on optimizing the alkali roasting conditions for chromite beneficiation tailings with the goal of enhancing chromium oxide (Cr₂O₃) extraction. Within the experimental framework, the variables included roasting temperature, the amount of added Na₂CO₃, and reaction time. The results revealed that temperature is the most critical factor directly affecting the extraction efficiency. Increasing the amount of Na₂CO₃ contributed to an increase in Cr₂O₃ recovery, although excessive addition may not be economically justified. The optimal conditions—1000 °C, 120%–130% Na₂CO₃ (relative to tailings mass), and 120 min—enabled a Cr₂O₃ extraction rate of up to 98.6% through aqueous leaching. The phase transformation analysis confirmed the breakdown of the spinel structure and formation of water-soluble sodium chromate. Microanalysis observations and measurements validated the progressive destruction of chromite grains and sodium enrichment in the reaction zones. The remaining leaching residue consisted of inert Na₂Mg₂Si₂O₇ and MgO, suitable for further metal recovery. The proposed approach enables efficient detoxification of hazardous tailings and serves as a basis for integrated utilization of Cr-bearing industrial waste.

alkali roasting , chromite tailings , Cr₂O₃ extraction , sodium carbonate

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Institute of Metallurgy and Ore Beneficiation, Satbayev University, Almaty, 050010, Kazakhstan

Institute of Metallurgy and Ore Beneficiation

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