A cleaner method for preparation of chromium oxide from chromite ore

Tian, Yijuan; Quan, Xuejun; Li, Gang; Tang, Xiaoyu; Qin, Xianfeng; Wu, Haifeng; Zeng, Kui; Jiang, Zhanghao

doi:10.1016/j.psep.2021.11.052

Cited by 14 publications

(1 citation statement)

References 36 publications

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“…Chemical bonds are destroyed during a chemical reaction; thus, the activation energy of the chemical-reaction-controlled process is typically higher than that of the diffusion controlled process. The relationship between the activation energy and kinetic control steps is presented in Table . − …”

Section: Resultsmentioning

confidence: 99%

The Leaching Behavior of Potassium Extraction from Polyhalite Ore in Water

Ma,

Zeng,

et al. 2023

ACS Omega

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The extraction of potassium from polyhalite ore (K 2 SO 4 •MgSO 4 •2CaSO 4 •2H 2 O) can help alleviate potassium resource shortages in China. In this study, the leaching behavior of potassium extracted from polyhalite ore in water was investigated using leaching experiments and kinetic analysis. The effects of various factors, such as liquid-to-solid ratio, leaching temperature, leaching time, and polyhalite ore particle size were comprehensively studied. It was found that high temperatures improved the reaction rate and efficiency at the beginning (1−15 min) but reduced the final leaching efficiency of potassium. And this phenomenon is discussed from the aspects of the dissolution− reprecipitation of potassium, newly formed solid products during the leaching process, and leaching thermodynamics. The leaching of potassium followed the Avrami model, with an apparent activation energy of 26.29 kJ/mol. Additionally, it was determined that the mixed controlled step (surface chemical reaction and diffusion) was the controlling step during potassium leaching. This study clarified the leaching mechanism of the polyhalite in water, and the causes of hindering the leaching of potassium were analyzed. The research results can provide theoretical reference and solutions for parameter design for the enhanced leaching process and selection of leaching agents in the future.

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