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| Exploration of High-Value Utilization of Arsenic-containing Solid Waste: Harmless Preparation of High Strength Ceramic Aggregates from Arsenic-Alkali Leaching Residue |
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Received:September 10, 2024
Revised:September 12, 2024
Accepted:September 13, 2024
Published Online:October 29, 2024
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| DOI：doi：10.3969/j.issn.1007-7545.2024.11.017 |
| KeyWord:arsenic-alkali leaching residue; ceramsite; arsenic; antimony |
| Author | Institution |
| SANG Mengchao |
中南大学资源加工与生物工程学院 |
| PENG Jun |
冷水江锑都环保有限责任公司 |
| WANG Yufeng |
中南大学资源加工与生物工程学院 |
| SUN Wei |
中南大学资源加工与生物工程学院 |
| HAN Haisheng |
中南大学资源加工与生物工程学院 |
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| Abstract: |
| The arsenic-alkali leaching residue contains certain compositional similarities to the main components of ceramsite, including SiO?, Al?O?, and alkaline metal oxides. Additionally, the pyrometallurgical process for arsenic removal is closely resembles the firing process for ceramsite production. This study proposes an approach for the safe synthesis of ceramsite from arsenic-alkali leaching residue, which involves arsenic removal and antimony recovery. Through reduction roasting, arsenic and antimony are volatilized and subsequently captured in the flue gas. The collected by-products can be directly recycled back into the antimony smelting system, thereby laying a foundation for further exploration of ceramsite preparation processes.The experimental results indicate that, with the Si/Al mass ratio controlled at 6.5, the total mass proportion of alkaline metal oxides (Na?O, CaO, Fe?O?, K?O, and MgO) in the raw materials (arsenic-alkali leaching residue, quartz, and alumina) maintained at 15%, and an external carbon addition of 5%, ceramsite with an apparent density of 1 022 kg/m3 and a fracturing force of 461 N was successfully obtained. This was achieved by heating in an argon atmosphere at 970 °C, with a holding time of 30 minutes using an in-furnace heating and cooling process. The residual arsenic and antimony contents were reduced to 0.020% and 0.44%, respectively, with volatilization rates of 99.19% for arsenic and 92.50% for antimony. These findings provide a valuable insights for the high-value utilization of arsenic-alkali leaching residues and other arsenic-containing solid wastes. |
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