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| 卡林型金矿的HClO4-FeCl3浸出及正交试验研究 |
| Study on HClO4-FeCl3 leaching and orthogonal test of Carlin-type gold ore |
| 投稿时间：2022-08-29 |
| DOI： |
| 中文关键词: 卡林型金矿 联合浸出 机理 正交试验 |
| 英文关键词: Carlin-type gold deposit combined leaching mechanism orthogonal test |
| 基金项目:贵州省科技计划项目(黔科合基础[2019] 1412号) |
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| 中文摘要: |
| 采用HClO4预氧化、FeCl3进一步氧化络合方法联合浸出品位低、成分杂的卡林型金矿中的金。机理分析认为，在浸出前期加入HClO4将金属硫化物中的硫以高价态硫酸根离子、硫酸氢根离子等形式进入溶液而脱除，减少单质硫形成钝化膜包裹从而阻碍金属硫化物的解离，同时保证体系中一定初始浓度的[Fe3+]、[Cl-]，有利于后续FeCl3浸金。正交试验研究表明，选定的4个因素对金浸出率的影响顺序为HClO4体积分数＞FeCl3浓度＞浸出温度＞HClO4预氧化时间，得到的较优浸出条件为HClO4体积分数6%、预氧化时间1 h、FeCl3浓度1.8 mol/L、40℃浸出5 h，在该条件下卡林型金矿金的浸出率为71.02%。 |
| 英文摘要: |
| Gold in Carlin-type gold ore with a low grade and mixed compositions was leached out by HClO4 preoxidation treatment and FeCl3 oxidation-complexation process. The mechanism analysis reveals that HClO4 added in the early stage of leaching can oxide the sulfur in the metal sulfide to high-valent sulfate ions and hydrogen sulfate, reducing the formation of passive film wrapped by elemental sulfur and accelerating the dissociation of metal sulfide. The initial concentration of [Fe3+] and [Cl-] in the system can facilitate the subsequent leaching of gold with FeCl3. The orthogonal test shows that the order of influence of the selected four factors on gold leaching rate is HClO4 volume percentage> FeCl3 concentration> extraction temperature> HClO4 preoxidation time. The optimum leaching conditions were obtained as follows: 6% of HClO4 volume fraction, pre-oxidation for 1h, 1.8 mol/L of FeCl3 and leaching at 40℃ for 5 h. Under these conditions, the gold leaching rate from Carlin-type gold ore was 71.02%. |
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