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Microwave Pretreatment Of A Refractory Gold

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MICROWAVE IRRADIATION PRETREATMENT OF A

01/01/1987· Microwave energy was applied in the pretreatment of a typical refractory arsenopyritic gold concentrate. More than 80% of As and S were volatilized off as As 2 O 3 and SO 2; whereas iron was oxidized mostly to hematite (Fe 2 O 3). All the gold was present in the calcine which responded favourably to the conventional alkaline cyanidation process and yielded 98% of Au and 60% of AgMicrowave pretreatment of a double refractory gold ore,,One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon. In this research, microwave roasting of a double refractory gold ore was investigated as an alternative method and the results were compared to those obtained by conventional roasting.Microwave pretreatment of a double refractory gold ore,Wei et al (2009) applied microwave energy in a similar pretreatment of refractory gold ores and reported improvements in the subsequent gold extraction.,

Microwave pretreatment of a double refractory gold ore,

One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon. In this research, microwave roasting of a double refractory gold ore was investigated as an alternative method and the results were compared to those obtained by conventional roasting. The compositional changes of the ore during roasting were determined by thermogravimetric analysis (TGA). Also, both the real andReview Pretreatment Process on Refractory Gold Ores with As,Microwave heating has the effect of reducing the tempera-ture of chemical reaction. So it can avoid generating gases of SO2 and As2O3 by controlling the temperature appropri-ately.5–7) Kyuesi and Haque, etc. have studied the role of micro-wave in the gold extraction process of arsenic-bearing refractory gold ore.8,9) Haque K E used microwave to dis-Study on Pretreatment of Refractory Gold Ore by,Microwave roasting method was applied for the pretreatment of refractory gold ore (RGO). The occurrence,phase of gold and microstructure of roasted product were analyzed. The results showed that gold existed in tiny granular gold and sub-micro grain gold,the occurrence form of gold was mainly in gold-bearing sulfides and gold-bearing quartz. So pretreatment was required to break gold-bearing,

Experimental Study on Microwave Pretreatment with some,

The microwave pretreatment of a typically refractory flotation gold concentrate was investigated. The results demonstrated that a maximum gold recovery of 97% was achieved, and that gold recoveries of the refractory gold concentrate quickly increased to the maximum with microwave heating time. Adding additives during microwave heating process was helpful to improve the leaching rate of gold, and the effect of microwave heating with single NaOH on the leaching rate of goldStudy on Pretreatment of Refractory Gold Ore by,Microwave roasting method was applied for the pretreatment of refractory gold ore (RGO). The occurrence,phase of gold and microstructure of roasted product were analyzed. The results showed that gold existed in tiny granular gold and sub-micro grain gold,the occurrence form of gold was mainly in gold-bearing sulfides and gold-bearing quartz. So pretreatment was required to break gold-bearing,Pretreatment Process on Refractory Gold Ores with As,Kyuesi and Haque, etc. have studied the role of microwave in the gold extraction process of arsenic-bearing refractory gold ore. 8,9) Haque K E used microwave to dispose of arsenical pyrite and gold concentrate with pyrite, the gold leaching rate reached 98%. 10) Liu Quanjun etc. made a test for a gold mine in Guizhou province. The ore without micro-wave pretreatment could be hardly leached in,

Experimental Study on Microwave Pretreatment with

The microwave pretreatment of a typically refractory flotation gold concentrate was investigated. The results demonstrated that a maximum gold recovery of 97% was achieved, and that gold recoveries of the refractory gold concentrate quickly increased to the maximum with microwave heating time. Adding additives during microwave heating process was helpful to improve the leaching rate of gold,Optimizing the alkaline oxidation pretreatment of a,,28/09/2018· Microwave pretreatment: For both conventional and indirect microwave roasting, gold recoveries of over about 98% were achieved after cyanide leaching. Li et al : Pre-oxidation by ozone and ferric ions in acidic media: Gold extraction from a high-sulfur and high-arsenic refractory gold concentrate after pre-oxidation under optimum conditions dramatically improved from 19.5% of directRemoval of arsenic and sulfur from a refractory gold,,01/01/2010· Prior investigation by the authors on the microwave pretreatment of a typically primary refractory gold flotation concentrate demonstrated that a maximum gold recovery of 97% was achieved, and that gold recoveries of the refractory gold concentrate quickly increased to the maximum with microwave irradiation time . This implies that the cyanidation of primary refractory gold ores could

Review Pretreatment Process on Refractory Gold Ores with As

Pretreatment Process on Refractory Gold Ores with As Xin-yuan NAN, Xin CAI* and Jun KONG School of Electrical Engineering, Xinjiang University, 1230 Yan’an Road, Tianshan District, Urumqi, 830047 P. R. China. (Received on August 30, 2013; accepted on October 17, 2013) The problem of the refractory nature of gold bearing arsenide ores is described. The basic principle, characteristics and,pretreatment of refractory ores prior to gold leaching,refractory gold pretreatment Microwave pretreatment of a double refractory gold ore Double refractory gold ores, such as Barrick's Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching. Supercritical Water Treatment of Refractory Gold Ores . acidic pretreatment of gold refractory ore processing. evaluating,Microwave roasting of flash flotation concentrate,,01/06/2020· Nanthakumar et al. (2007) investigated the use of microwave energy in pretreating a double refractory gold ore containing 1.56% sulphur and 5.96% total carbon. Wei et al (2009) applied microwave energy in a similar pretreatment of refractory gold ores and reported improvements in the subsequent gold extraction.

Extraction of Gold from a Low-Grade Double Refractory

The treatment process of a low-grade refractory gold ore containing sulfide minerals and carbonaceous matters was studied in this work. The gold extraction of this ore by all-sliming cyanidation was only 11.75%. Hence, a pretreatment was necessary. In this paper, a flotation-preoxidation-cyanide leaching process was developed. The concentrate,Refractory Gold Ore Treatment Methods,Metallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold Extraction from Carbonaceous OreList Gold Refractory Process Methods Where gold is associated with arsenic, antimony, tellurium, andSTUDY ON MICROWAVE PRETREATMENT OF,By using the heating feature of microwave, it has shown from condition tests that the gold leaching recovery can be improved from 74% to more than 90% if the gold concentrates is treated for 5 minutes in a microwave oven at 450℃. Therefore, the gold leaching recovery of cyanide residue of more than 86% can be obtained in leaching plant. The results indicate that microwave pretreatment to,

Experimental Study on Microwave Pretreatment with

The microwave pretreatment of a typically refractory flotation gold concentrate was investigated. The results demonstrated that a maximum gold recovery of 97% was achieved, and that gold recoveries of the refractory gold concentrate quickly increased to the maximum with microwave heating time. Adding additives during microwave heating process was helpful to improve the leaching rate of gold,Study on Pretreatment of Refractory Gold Ore by,Microwave roasting method was applied for the pretreatment of refractory gold ore (RGO). The occurrence,phase of gold and microstructure of roasted product were analyzed. The results showed that gold existed in tiny granular gold and sub-micro grain gold,the occurrence form of gold was mainly in gold-bearing sulfides and gold-bearing quartz. So pretreatment was required to break gold-bearing,An application of microwave pre-oxidation in improving,,The microwave pretreatment of a typically refractory flotation gold concentrate was investigated. The results demonstrated that a maximum gold recovery of 97% was achieved, and that gold,

Pretreatment Process on Refractory Gold Ores with As

Kyuesi and Haque, etc. have studied the role of microwave in the gold extraction process of arsenic-bearing refractory gold ore. 8,9) Haque K E used microwave to dispose of arsenical pyrite and gold concentrate with pyrite, the gold leaching rate reached 98%. 10) Liu Quanjun etc. made a test for a gold mine in Guizhou province. The ore without micro-wave pretreatment could be hardly leached in,Optimizing the alkaline oxidation pretreatment of a,,28/09/2018· Microwave pretreatment: For both conventional and indirect microwave roasting, gold recoveries of over about 98% were achieved after cyanide leaching. Li et al : Pre-oxidation by ozone and ferric ions in acidic media: Gold extraction from a high-sulfur and high-arsenic refractory gold concentrate after pre-oxidation under optimum conditions dramatically improved from 19.5% of directMicrowave Heating Applications in Mineral Processing,,10/12/2011· Microwave assisted pretreatment of refractory gold concentrate. Gold is considered to be refractory when it cannot be easily recovered by alkaline cyanide leaching. The vast majority of refractory gold occurs in sulphidic minerals such as pyrite (FeS 2), arsenopyrite (FeAsS) and pyrrhotite (FeS). Generally, refractory gold concentrate or ore is pretreated by roasting, O 2-pressure leaching

pretreatment of refractory ores prior to gold leaching

refractory gold pretreatment Microwave pretreatment of a double refractory gold ore Double refractory gold ores, such as Barrick's Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching. Supercritical Water Treatment of Refractory Gold Ores . acidic pretreatment of gold refractory ore processing. evaluating,Developments in the pretreatment of refractory gold,,Keywords: nitric acid; pretreatment; refractory gold Paper 40_Deng-xin:text 10/15/09 4:32 PM Page 145. 146 WORLD GOLD CONFERENCE 2009 Feed material is mixed with water and nitric acid to the desired solids concentration in the feed tank and is fed into the reactor via a trash screen and positive displacement pump. The solution is heated in direct gas-fired heaters to initiate the reactions,Mineralogy and Pretreatment of a Refractory Gold,Title: Mineralogy and pretreatment of a refractory gold deposit in Zambia. Dear Reviewer, We would like to deeply thank you all for your carefully reviewing our manuscript (Title: Mineralogy and pretreatment of a refractory gold deposit in Zambia, Manuscript number: Minerals-531101). We also thank you for your careful read and thoughtful comments which would help us both in English and in,