Research on the mechanism of treating red mud with acid and the utilization of read mud as phosphate adsorbent
- Authors: Quy Ngoc Vu 1, Vaughan James, Peng Hong 2
Affiliations:
1 Chi nhánh Luyện đồng Lào Cai-VIMICO, Tổng Công ty Khoáng sản - TKV
2 Trường Đại học Công nghệ Hóa học, Đại học Tổng hợp Queensland, Australia
- *Corresponding:This email address is being protected from spambots. You need JavaScript enabled to view it.
- Keywords: Red mud, Acid treatment, Phosphate adsorption, Low-cost approach
- Received: 18th-Apr-2022
- Revised: 15th-May-2022
- Accepted: 25th-May-2022
- Online: 30th-June-2022
Abstract:
A low-cost approach to red mud utilization has not been achieved due to the complicated composition of this bauxite residue. In this study, the mechanism that acid modifies red mud and how it impacts phosphate (PO4 3-) adsorption behaviours were investigated. The experimental data indicate that hydrochloric acid could significantly modify red mud mineral composition. Low acid concentrations would considerably reduce red mud alkalinity through the ion-exchange process between protons and the sodalite phase. A concentration of 0.25M and higher could completely dissolve the sodalite phase, leaving behind a highly absorbable surface. Acid-treated red mud exhibited a better phosphate adsorption capability than original red mud under an uncontrolled pH condition, while an excellent performance of original red mud was observed at pH 5.0 and 6.0 due to calcium phosphate precipitation, excluding 100% of phosphate from the solution containing 100mg/L PO4 3-. It was also found that the Hematite phase was highly responsible for phosphate immobilization of acid-treated red mud, while temperature had a limited effect on the adsorption process. Red mud could be utilized as a low-cost adsorbent for the wastewater treatment industry.
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