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Recovery of gold and base metals from gold ore leach solution obtained by elecro-oxidation

机译：从电氧化得到的金矿石浸出液中回收金和贱金属

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The leaching of the gold from gold industry waste in NaCl aqueous solution by electro-oxidation was investigated and the major process parameters including current density, pulp density and pH of slurry were examined. In electro-oxidation process dissolution of gold increased with leaching time and gold extraction from the gold ore is getting to 90-98%. However, the accompanying elements in the gold ore were recovered into solution together with gold during electro-oxidation process. In alkaline leach solution dissolved iron, titanium etc. removed into residue as a precipitation of their hydroxide and oxide compounds. From these result two possible ways are suggested for recovery of gold and accompanying elements from leach solution. One is recovery of gold in the form of precipitation using strong reducers. Another is precipitation of accompanying elements by changing the pH of leach solution to alkaline.To clarify these points, recovery of gold and accompanying elements from leach solution obtained by electro-oxidation process were examined.With the purpose of the extracting gold from black batches (waste of gold ore industry), electrolysis of slurry prepared by mixing gold ore and 10% NaCl aqueous solution was curried out in acidic condition at constant current and temperature (pH=2-3, I=1A, T=313K). The samples used in this study were obtained from Zaamar gold industry in Mongolia. Gold recovery from the leach solution by solvent extraction using isoamyl alcohol followed by hydrazine hydrochloride precipitation was investigated. Reasonable experimental conditions were found for obtaining of gold with 99.99% purity. After gold separation, ore base metals (Fe, Ti) could be recovered as a precipitate by changing the pH of the leach solution from acid to alkaline.
机译：研究了电氧化法从NaCl水溶液中浸提金工业废料中的金，并研究了主要工艺参数，包括电流密度，纸浆密度和浆料的pH值。在电氧化过程中，金的溶解度随着浸出时间的增加而增加，并且从金矿石中提取金的比例达到90-98％。然而，在电氧化过程中，金矿石中的伴生元素与金一起被回收到溶液中。在碱性浸出溶液中，溶解的铁，钛等因其氢氧化物和氧化物的沉淀而被除去。从这些结果中，提出了两种从浸出溶液中回收金和伴生元素的可能方法。一种是使用强还原剂以沉淀形式回收金。另一个是通过将浸出溶液的pH值更改为碱性来沉淀伴随元素的沉淀。为澄清这些点，研究了通过电氧化法从浸出溶液中回收金和伴生元素的方法。废液），在酸性条件下，在恒定电流和恒定温度（pH = 2-3，I = 1A，T = 313K）的条件下，对通过混合金矿石和10％NaCl水溶液制备的浆料进行电解。本研究中使用的样品来自蒙古的Zaamar金业。研究了通过使用异戊醇进行溶剂萃取，然后通过盐酸肼沉淀从浸出液中回收金的方法。发现了获得99.99％纯度的金的合理实验条件。分离金后，可以通过将浸出溶液的pH值从酸性更改为碱性，将矿石贱金属（Fe，Ti）作为沉淀物回收。

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