氰化物浸金提取中孔雀石的浸出行為研究
發(fā)布時間:2018-08-23 08:30
【摘要】:隨著黃金工業(yè)的發(fā)展,作為難處理金礦石重要部分,含銅金礦研究與利用越來越重要。含銅金礦中絕大多數(shù)銅礦物都可溶解于氰化物溶液,而銅礦物溶解性質(zhì)研究相對較少,孔雀石為含銅金礦中常見銅礦物,具有一定的代表性,本論文將通過熱力學(xué)分析、浸出試驗(yàn)研究、動力學(xué)研究等對孔雀石在氰化浸出過程行為進(jìn)行研究。熱力學(xué)分析表明,無絡(luò)合劑存在條件下,堿性無氰環(huán)境下孔雀石自身幾乎不會發(fā)生溶解,而在氰根絡(luò)合作用下,孔雀石可自發(fā)發(fā)生溶解生成銅氰絡(luò)合物,且較高的氰根濃度利于高配位數(shù)銅氰絡(luò)合物的形成。氰根自身在有氧條件下也會發(fā)生氧化反應(yīng),同時造成pH值增加。浸出試驗(yàn)結(jié)果表明,孔雀石在氰化物中溶解不可避免,較大的氰化鈉濃度、較高的溫度、較長的浸出時間均會增大孔雀石的浸出率,改變氧含量本質(zhì)上不能減小氰化物的消耗。浸出動力學(xué)研究表明,孔雀石浸出過程可分為兩個階段,第一階段活化能E1=25.472 J·mol-1,第二階段活化能E2=15.522 J·mol-1,均屬于混合控制。金片浸出試驗(yàn)結(jié)果表明,在氧氣參與下,金片可溶解于銅氰絡(luò)離子溶液中。
[Abstract]:With the development of gold industry, as an important part of refractory gold ores, the research and utilization of copper-bearing gold deposits are becoming more and more important. Most of copper minerals in copper-bearing gold deposits are soluble in cyanide solution, while the study of solubility of copper minerals is relatively less. Malachite is a common copper mineral in copper-bearing gold deposits, which has a certain representativeness. The behavior of malachite in cyanide leaching process was studied by thermodynamic analysis, leaching test and kinetics study. The thermodynamic analysis showed that Malachite could hardly dissolve in alkaline cyanide-free environment without complexing agent. Under cyanide complexation, Malachite could dissolve spontaneously to form copper-cyanide complexation. The results of leaching test show that Malachite dissolution in cyanide is unavoidable. Higher concentration of sodium cyanide, higher temperature and longer leaching time will increase peacock. The leaching kinetics of Malachite can be divided into two stages: the first stage activation energy E1 = 25.472 J. mol - 1, the second stage activation energy E2 = 15.522 J. mol - 1, which belongs to mixed control. The results of gold strip leaching test show that gold can be leached with oxygen. The film can be dissolved in cupric cyanide solution.
【學(xué)位授予單位】:昆明理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TD953
本文編號:2198490
[Abstract]:With the development of gold industry, as an important part of refractory gold ores, the research and utilization of copper-bearing gold deposits are becoming more and more important. Most of copper minerals in copper-bearing gold deposits are soluble in cyanide solution, while the study of solubility of copper minerals is relatively less. Malachite is a common copper mineral in copper-bearing gold deposits, which has a certain representativeness. The behavior of malachite in cyanide leaching process was studied by thermodynamic analysis, leaching test and kinetics study. The thermodynamic analysis showed that Malachite could hardly dissolve in alkaline cyanide-free environment without complexing agent. Under cyanide complexation, Malachite could dissolve spontaneously to form copper-cyanide complexation. The results of leaching test show that Malachite dissolution in cyanide is unavoidable. Higher concentration of sodium cyanide, higher temperature and longer leaching time will increase peacock. The leaching kinetics of Malachite can be divided into two stages: the first stage activation energy E1 = 25.472 J. mol - 1, the second stage activation energy E2 = 15.522 J. mol - 1, which belongs to mixed control. The results of gold strip leaching test show that gold can be leached with oxygen. The film can be dissolved in cupric cyanide solution.
【學(xué)位授予單位】:昆明理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TD953
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