Optimization of Arsenic Fixation in the Pressure Oxidation of Arsenopyrite Using Response Surface Methodology

被引:4
|
作者
Liu, Yanhua [1 ]
Ng, Wei Sung [1 ]
Chen, Miao [2 ]
机构
[1] RMIT Univ, Sch Sci, Ctr Adv Mat & Ind Chem, Melbourne, Vic, Australia
[2] CSIRO Mineral Resources, S Clayton, Vic 3169, Australia
来源
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW | 2024年 / 45卷 / 02期
基金
澳大利亚研究理事会;
关键词
Arsenic fixation; scorodite; pressure oxidation; response surface methodology; thermodynamic modeling; BASIC IRON SULFATE; THERMODYNAMIC PROPERTIES; SOFTWARE PACKAGE; AQUEOUS-SOLUTION; SCORODITE; ACID; IMMOBILIZATION; MINERALS; BEHAVIOR; GOLD;
D O I
10.1080/08827508.2022.2127703
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
Arsenic is a common pollutant and impurity present in complex gold ores. In the pressure oxidation (POX) of refractory gold-bearing sulfides, a major environmental challenge is the treatment of the hazardous waste released from arsenic-bearing minerals during processing. While the bulk removal of arsenic from solution can occur during POX, the formation of stable arsenates relies on the operating conditions during POX and the subsequent curing stage. Herein, response surface methodology (RSM) and central composite design have been investigated as viable approaches for optimizing arsenic fixation during the curing of the POX product of arsenopyrite. Curing time (0-24 h) and temperature (60-120 degrees C) were examined as the model variables for RSM optimization, and the performance was assessed via arsenic and iron precipitation, along with the change in free acid and sulfate concentrations. Experimental validation of the optimized model conditions demonstrated good agreement with the simulated outputs and provided a 10% increase in arsenic removal over the best model input. The formation of basic ferric arsenate sulfate and scorodite under these conditions was supported by RSM and confirmed via characterization. In the investigated system, the maximum arsenic removal occurs at a critical threshold temperature of 107 degrees C, over which the scorodite formation decreases with temperature. Thermodynamic modeling revealed the preferable formation of soluble FeHAsO4+ complexes over scorodite above this threshold temperature, decreasing arsenic fixation at higher temperatures.
引用
收藏
页码:101 / 113
页数:13
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