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08:01
Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
Published on: June 28, 2019
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Arsenic removal from alkaline leaching solution using Fe (III) precipitation.
Yongliang Wang1, Cuicui Lv1,2, Li Xiao1,2
1a State Key Laboratory of Multiphase Complex System, Institute of Process Engineering, Chinese Academy of Sciences , Beijing , People's Republic of China.
Environmental Technology
|January 19, 2018
Summary
Iron (III) precipitation effectively removes harmful arsenate ions from gold concentrate leaching solutions. Optimal arsenic removal occurs at pH 5.25-5.96 with a Fe/As ratio above 2.5, ensuring safe precipitate storage.
Area of Science:
- Environmental Chemistry
- Metallurgical Engineering
- Inorganic Chemistry
Background:
- Arsenate ions in alkaline leaching solutions from arsenic-containing gold concentrate pose environmental and production risks.
- Effective removal of these ions is crucial for sustainable gold processing and environmental protection.
Purpose of the Study:
- To investigate the removal of arsenate ions from alkaline leaching solutions using conventional Fe(III) precipitation.
- To determine the optimal conditions (pH and Fe/As ratio) for efficient arsenic removal and safe precipitate disposal.
Main Methods:
- Arsenic removal via Fe(III) precipitation from alkaline leaching solutions.
- Investigation of pH and Fe/As ratio effects on arsenic removal efficiency.
- Analysis of precipitate characteristics and leaching toxicity.
Main Results:
- Arsenic removal rate is highly pH-dependent, with optimal performance between pH 5.25-5.96.
- Increased Fe/As ratio enhances arsenic removal, achieving <5 mg/L at pH 5.25-5.96 and Fe/As > 1.8.
- Precipitates exhibit poor crystallinity and small particle size (approx. 1 μm), but leaching toxicity decreases with increasing Fe/As ratio, enabling safe storage above Fe/As = 2.5.
Conclusions:
- Conventional Fe(III) precipitation is an effective method for removing arsenate from gold leaching solutions.
- Optimized pH and Fe/As ratio are critical for achieving high removal rates and ensuring the safe disposal of ferric arsenate precipitates.
- The study provides a viable pathway for managing arsenic contamination in gold mining operations.
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