Jul 26, 2016Iberian Develops New Enviro Friendly Alternative to Cyanide. Figure 1. Comparative applicability, sensitivity, solubility, consumption and cost analysis. Gold and other precious metals are readily recovered from the HM X leach solution through a number of well known and proven extraction methods including; electrowinning,
Alternative lixiviants to cyanide for leaching gold ores. In most alternative cyanide leaching processes, reductions in the quantity of reagents used, reagent consumption and improvements in recovery technology are required. Some chemicals used such as ammonia also pose health, safety and environmental concerns.
concluded that thiosulfate is the most promising alternative to cyanide for the recovery of gold from ores. The advantages and disadvantages of thiosulfate leaching of gold are listed below. Advantages (i) Thiosulfate has very low toxicity and has been used as a fertilizer for many years due to its relatively low impact on the environment.
This paper reviews a series of alternative lixiviant systems for the recovery of gold from ores and concentrates. For over 100 years, cyanide has been the leach reagent of choice in gold mining because of its high gold recoveries, robustness and relatively low costs.
Despite the extent of research conducted on alternative lixiviants, the solubility of base metals and copper associated with gold ores for the alternative lixiviants has not been extensively studied. In general, for the lixiviant systems operating under acidic conditions (e.g., halides) the lixiviant is typically nonselective for gold with higher copper solubility than for cyanide.
Some preliminary results on the secondary leaching of previously heap leached gold ore are presented. Alternative lixiviants for gold comprising chlorine, thiourea and thiosulphate were compared with cyanide using bottle roll tests. Chlorine was subsequently selected for column leaching tests.
Despite the research interest and pilot plant trials on many of the noncyanide gold lixiviants, the majority are still at the development stage. The most advanced alternative lixiviant is thiosulfate leaching of carbonaceous preg robbing ores, which has been largely developed by Newmont Mining, Placer Dome, and Barrick Gold.
pose, the gold leaching reagents are described and discussed in terms of their environmental and economical points of view. As result of this comparison, thiourea stands out as the most promising alternative gold leaching reagent to cya nide. Keywords Hydrometallurgy, Leaching, Cyanide, Alternative Reagents, Recovery 1. Introduction
Iberian develops new enviro friendly alternative to cyanide. Numerous other chemicals have been tested to leach gold, and they include thiosulfate, thiocyanate, ammonia, bromine, chlorine, bisulfides, and thiourea but no one has come up with a more cost effective and productive method than leaching with cyanide until now.
Iberian develops new enviro friendly alternative to cyanide. Alternative lixiviants or leaching agents should also be inexpensive and recyclable, selective, non toxic and compatible with downstream recovery processes. There is an increasing interest in finding new alternatives or
An Overview of the EnviroLeach Gold Recovery Process agents have been identified that improve the gold leach kinetics as well as the stability of the gold that has leached into solution. These leach modifying additives are a unique and key component in the effectiveness of this process.
Jan 01, 2005AbstractThiosulphate is an attractive alternative reagent to cyanide for processing gold ores. It is relatively cheap and non toxic, forms relatively strong gold and silver complexes, and readily leaches gold ores in ammoniacal solutions, catalysed by Cu(II).
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