TWO-STEP HYDROCHLORIC ACID LEACHING OF SCANDIUM FROM RED MUD FROM BAYER PROCESS

HAO Shuai; LI Cheng; XI Yi-hui; LI Ai-min; YANG Fu-sheng; GUO Yan

doi:10.13205/j.hjgc.202101021

Volume 39 Issue 1

Apr. 2021

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HAO Shuai, LI Cheng, XI Yi-hui, LI Ai-min, YANG Fu-sheng, GUO Yan. TWO-STEP HYDROCHLORIC ACID LEACHING OF SCANDIUM FROM RED MUD FROM BAYER PROCESS[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(1): 136-141,200. doi: 10.13205/j.hjgc.202101021

Citation:

HAO Shuai, LI Cheng, XI Yi-hui, LI Ai-min, YANG Fu-sheng, GUO Yan. TWO-STEP HYDROCHLORIC ACID LEACHING OF SCANDIUM FROM RED MUD FROM BAYER PROCESS[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(1): 136-141,200. doi: 10.13205/j.hjgc.202101021

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TWO-STEP HYDROCHLORIC ACID LEACHING OF SCANDIUM FROM RED MUD FROM BAYER PROCESS

doi: 10.13205/j.hjgc.202101021

1. Xi'an Jiaotong University, School of Chemical Engineering and Technology, Department of Process Equipment and Control Engineering, Xi'an 710049, China;
2. Shanxi Institute of Rock Ore Test and Application, Taiyuan 030001, China;
3. Xi'an Jiaotong University, School of Energy and Power Engineering, Department of Environmental Engineering, Xi'an 710049, China

Received Date: 2019-12-10
Available Online: 2021-04-23

Abstract

Abstract

The Gibbs free energy of reaction between various metal oxides and hydrochloric acid, was calculated to explore the feasibility of two-step hydrochloric acid leaching for scandium recovery from red mud produced in Bayer process. In order to achieve a high leaching rate of scandium ion and a high selectivity of scandium against other metals, orthogonal experiments of secondary acid leaching with low-concentration hydrochloric acid of about 2.5 mol/L were conducted. Design-Expert 8.0 software was utilized to analyze the experimental data, and the impacts of key factors, i.e. temperature, time duration, liquid-solid ratio, hydrochloric acid concentration on the leaching rate of various metal ions were discussed. The corresponding polynomial models were also established. Finally, the optimum operating conditions were determined as follows:leaching temperature of 70℃, duration of 70 min, liquid solid ratio of 6 and HCl concentration of 2.5 mol/L. A high leaching rate of more than 80% was achieved for scandium under such condition, while the leaching rates for the key impurities, i.e. Fe, Zr and Ti kept low.
- red mud,
- acid leaching,
- orthogonal experiment,
- Gibbs free energy

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