Inorganic Chemicals Industry >
Study on deep extraction of chromium from calcium-free roasting slag of chromite ore
Received date: 2024-02-02
Online published: 2025-01-24
A large amount of unreacted chromium still exists in the chromite oxidation roasting-water leaching chromium extraction residue，and the study of its in-depth extraction is of great significance for realizing the full resource utilization of chromite resources.In this study，the NaOH-NaCl system was proposed for the deep extraction of chromium from the calcium-free roasting residue of chromite，and the effects of process parameters on the extraction rate of chromium in the oxidative roasting process and the kinetics of the roasting process were investigated.The results showed that parameters such as NaCl dosage，roasting time and roasting temperature affected the extraction rate of chromium.Under the optimized conditions of sodium hydroxide of 40%， sodium chloride of 10%，chromium slag size of 100 mesh，roasting temperature of 900 ℃ and roasting time of 150 min，the chromium extraction rate reached 98%.The addition of NaOH with a low melting point promoted mass transfer，and Cl2 generated from the decomposition of NaCl acted as a catalyst and oxidizer，providing a new idea for the efficient recovery of chromium from chromium slag.The oxidative roasting system of chromium slag in NaOH-NaCl was controlled by internal diffusion with the frequency factor A=0.026 min-1，and the apparent activation energy of the reaction E was about 25.00 kJ/mol.The chromium slag after chromium extraction by roasting was also characterized，and the results showed that the structure of chromium slag was destroyed during roasting，and chromium was released in the spinel structure to achieve chromium extraction.
ZENG Yijun , JIANG Ziwen , JIAN Chengzong , QUAN Xuejun . Study on deep extraction of chromium from calcium-free roasting slag of chromite ore[J]. Inorganic Chemicals Industry, 2025 , 57(1) : 90 -96 . DOI: 10.19964/j.issn.1006-4990.2024-0070
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