Hypochlorite leaching system is a strong oxidizing solution for metal sulfides, which are naturally associated with gold extraction. This study evaluated the hypochlorite leaching of refractory gold ore by using the response surface method–central composite design (RSM-CCD) as a statistical approach in determining the optimum condition of gold extraction from refractory gold ore. The studied parameters for the gold recovery were pH (4 to 6), concentrations of Ca(OCl)₂ (0.5 to 1.5 M) and NaCl (2.5 to 3.5 M) in the solution. It was found that the maximum gold extraction of 82.46% (13.85 g/t) was achieved at a pH of 4.0 with NaCl and Ca(OCl)₂ concentrations of 2.93 M and 1.08 M, respectively. The statistical analysis also revealed that the amount of gold recovery in chloride solution was significantly depended on pH as the main factor, followed by concentrations of Ca(OCl)₂ and NaCl.

次氯酸盐浸出系统是金属硫化物的强氧化溶液，金属硫化物与金的提取自然相关。这项研究通过使用响应面法-中心复合设计（RSM-CCD）作为统计方法来确定难处理金矿石的最佳提取条件，评估了难处理金矿石的次氯酸盐浸出。研究的金回收参数为溶液中的pH值（4至6），Ca（OCl）_2的浓度（0.5至1.5 M）和NaCl的浓度（2.5至3.5 M）。发现在NaCl和Ca（OCl）₂的pH值为4.0时，最大金提取率为82.46％（13.85 g / t）浓度分别为2.93 M和1.08M。统计分析还显示，氯化物溶液中金的回收量显着取决于pH作为主要因素，其次是Ca（OCl）₂和NaCl的浓度。