![]() The transformation of chemically bound gold into metallic gold during industrial scale roasting of an arsenical gold ore concentrate from the Fairview Mine, Eastern Transvaal, has been studied quantitatively by 197 Au Moessbauer spectroscopy. International Nuclear Information System (INIS) With CICL treatment, recoveries on carbon were 90% and 92%.Ī 197Au and 57Fe Moessbauer study of the roasting of refractory gold ores Basic cyanide amenability testing of two carbonaceous ores achieved recoveries of only 5.5% and 46%. With highly carbonaceous ores, CICL achieved a higher recovery than with primarily sulfidic refractory ores. In this environment, the refractory ore is altered, and gold is extracted and then recovered on activated carbon. Results showed that the organic carbon deactivating environment of CICL lowers, but does not eliminate, the adsorption of gold on activated carbon. The objective of this research was to demonstrate the basic feasibility of CICL technology. Bureau of Mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores, comparing various treatment methods in which a ground ore pulp is contacted with chlorine gas and activated carbon is added to the pulp for a carbon-in-chlorine leach (CICL). The recovery of gold from refractory ores by the use of carbon-in-chlorine leaching This process opens the possibilities of maximizing Au grade and recoveries in a muti-Au carrier and low grade refractory gold ore where low recoveries are common. Two-step floatation and part of middling combined to the floatation tailing for gold leaching process resulted in high gold grade (g.t-1) and gold recovery (%) for this refractory gold ore. The present work describes an experimental study on the effect of traditional parameters (such as grinding fineness and reagent regimes), middling processing method and flowsheet construction on the total recovery and the assay of the floatation concentrate. by a mineral liberation analyser were used for mineralogical characterization study of this ore. Mineral liberation analysis, scanning electron microscopy, element phase analysis and etc. Y.ĭetailed mineralogy and beneficiation and leaching study of a muti-Au carrier, low grade refractory gold ore from a beneficiation plant in Henan Province, China, was investigated. The results well indicated the applicability of CGA to upgrade the refractory gold ore.īeneficiation and leaching study of a muti-Au carrier and low grade refractory gold ore The elemental analysis of gold and sulphur explained their relationship with gold recovery. More than 20-60 times grade increase from the head grade was obtained with CGA-flotation. The results showed that the higher gold grade and recovery were achieved by applying the CGA-flotation, compared with the flotation without CGA. In addition, the flotation without CGA was performed under the same condition for comparison. The ore with the grade of 2-5 g/t was tested with the CGA-flotation process in six different size fractions from 38 to 300 urn using different collector types and dosages. This study aimed to investigate the applicability of coal-oil gold agglomeration (CGA) assisted flotation to recover gold from a refractory ore. ![]() Coal-oil gold agglomeration assisted flotation to recover gold from refractory ore
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