pretreatment of refractory gold ore

2021-10-19T08:10:35+00:00

Pretreatment of a refractory arsenopyritic gold ore

An arsenopyrite refractory ore was pretreated with NaOH to increase gold extraction • After pretreatment, gold and silver were leached with copper ammonium thiosulfate solution • Thiosulfate leaching of the asreceived ore extracted only 21% and 29% of silver and gold, respectively •Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding 1) Arsenicbearing refractory gold ore has stones extremely difficult to deal with In the stones, gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic latticePretreatment Process on Refractory Gold Ores with As Double refractory gold ore was sequentially pretreated to oxidize sulfides by thermophilic archaeon Acidianus brierleyi and then to decompose carbonaceous matters using the cellfree spent medium (CFSM) from whiterot fungus Phanerochaete chrysosporiumThe pretreatment by A brierleyi significantly improved the gold recovery from 25% to 77% Additionally, the crude lignindegrading Sequential pretreatment of double refractory gold ore

(PDF) A Preliminary Study on Nitric Acid Pre

Direct cyanidation of both refractory silver ore and gold/silver concentrate resulted in low extractions of only ≤71% over 24 h After nitric acid pretreatment, the extraction of gold mainly about the refractory gold leaching easily through arsenic removal to expose gold, changing the composition, physicchemical and electrochemical properties of the ore Currently, there are four main methods of pretreatments of refractory gold ores with As Pretreatment options for dealing with refractory gold ores are illustrated in Fig Review Pretreatment Process on Refractory Gold Ores Typically, gold is encapsulated or finely disseminated in refractory gold ores and the direct cyanidation is not effective for gold extraction from these ores, even after the ore is ground to exceeding small particles (Nazari, 2017, Corrans and Angove, 1991)Especially for sulfide refractory gold ores, in order to recover gold, many oxidation pretreatment technologies were proposed including Recovery of gold from sulfide refractory gold ore

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 Pretreatment of sulfide refractory gold ore by biooxidation in coarsecrushed ore heaps, prior to leaching the gold in a separate heap, is a promising new technology that is about to be Recovery of gold from sulfide refractory gold ore A lowgrade sample of a double refractory gold ore was obtained from Barrick Gold Strike Two kilograms of the ore was mixed with 850 ml of tap water and ground for an hour in a mild steel rod mill with stainless steel rods (23 rods with a mass of 164 kg) Microwave pretreatment of a double refractory gold

Recovery of gold from sulfide refractory gold ore: Oxidation

Recovery of gold from sulfide refractory gold ore: Oxidation roasting pretreatment and gold Minerals Engineering ( IF 3795) Pub Date : , DOI: 101016/jmineng2021 Hong Qin, Xueyi Guo, Qinghua Tian, Dawei Yu, Lei Zhang Part of refractory gold ores of gold particles with fine gold or submicroscopic gold a parcel or disseminated exist in sulfide ore and the sulfide is usually pyrite, arsenopyrite, pyrrhotite, even in some mineral deposits, most of the gold can enter the crystal lattice of pyrite, arsenopyrite, in the state of super micro gold Even if the ore Microbial Pretreatment of Refractory Gold Ore Xinhai1 Introduction Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding 1) Arsenicbearing refractory gold ore has stones extremely difficult to deal with In the stones, gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic latticePretreatment Process on Refractory Gold Ores with As

Mineralogy and Pretreatment of a Refractory Gold

The grade and recovery of gold in the flotation concentrates were 4944 g/t and 3336%, respectively The total recovery of gold was 9094% The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of gold Developments in the pretreatment of refractory gold minerals by nitric acid DX LI College of Environmental Science and Engineering, China The paper covers many literature reports of processes using nitrogenous species as an oxidant for processing refractory gold ores, especially development in the pretreatment of refractory goldDevelopments in the pretreatment of refractory gold Pretreatment of sulfide refractory gold ore by biooxidation in coarsecrushed ore heaps, prior to leaching the gold in a separate heap, is a promising new technology that is about to be Recovery of gold from sulfide refractory gold ore

(PDF) A Preliminary Study on Nitric Acid Pre

Direct cyanidation of both refractory silver ore and gold/silver concentrate resulted in low extractions of only ≤71% over 24 h After nitric acid pretreatment, the extraction of gold and silver Optimizing the alkaline oxidation pretreatment of a refractory gold ore using taguchi orthogonal array method To cite this article: Foad Mahmoodi and Asghar Azizi 2018 Mater Res Express 5 View the article online for updates and enhancements Recent citations Synergistic effect of reduction leaching of manganese anode slime and oxidationOptimizing the alkaline oxidation pretreatment of a This paper presents the alkaline sulfide pretreatment of an antimonial refractory gold and silver ore In the ore, gold occurs mainly as goldsilver alloys and as associated with quartz and framboidal pyrite grains, and, to a small extent, as the inclusions within antimonial sulfides Silver is present extensively as antimonial sulfides such as andoriteAlkaline sulfide pretreatment of an antimonial

Supercritical Water Treatment of Refractory Gold Ores

With pretreatment, gold recovery was 90%; by contrast, gold recovery was below 10% without pretreatment Recent work at the Bureau of Mines showed some unique and potentially useful results when refractory gold ores were pretreated with supercritical water before standard leaching This work is described below gold in iron sulfide minerals such as pyrite and arsenopy rite Such deposits are called refractory gold ores due to the encapsulation of fine particles of gold in the ore host A clear boundary between refractory and nonrefractory ore in terms of gold recovery is not well defined, but several authors have pointed out that less than 60% goldEffect of Pretreatment of Sulfide Refractory Concentrate Refractory Gold Pretreatment pH Mining: Gold Processing Refractory gold ores are deﬁ ned as containing minerals or carbon compounds that trap encapsulated gold and make leaching extraction difﬁ cult These types of ores require pretreatment prior to cyanidation Options for pretreatment include the following processes: • RoastingApplication Note Refractory Gold Pretreatment pH

Microbial Pretreatment of Refractory Gold Ore Xinhai

Part of refractory gold ores of gold particles with fine gold or submicroscopic gold a parcel or disseminated exist in sulfide ore and the sulfide is usually pyrite, arsenopyrite, pyrrhotite, even in some mineral deposits, most of the gold can enter the crystal lattice of pyrite, arsenopyrite, in the state of super micro gold Even if the ore 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 submicro grain gold,the occurrence form of gold was mainly in goldbearing sulfides and goldbearing quartz So pretreatment was required to break goldbearing Study on Pretreatment of Refractory Gold Ore by The invention discloses a pretreatment method of refractory gold ore, which is characterized by comprising the following steps of: adopting a drywet twolevel ball grinder activating and impregnation process; carrying out firstlevel dry grinding by adopting a vibratory ball grinder and efficiently improving the mineral activity on the basis of energy conservation through adjusting the CNA Pretreatment method of refractory

Developments in the pretreatment of refractory gold

Developments in the pretreatment of refractory gold minerals by nitric acid DX LI College of Environmental Science and Engineering, China The paper covers many literature reports of processes using nitrogenous species as an oxidant for processing refractory gold ores, especially development in the pretreatment of refractory gold57 Claim 1 A process for recovering gold from refractory auri ferous ironcontaining suiphidic ore comprising: feeding ground ore as an aqueous slurry to an acidic pretreatment step, treating the ground ore in the acidic pretreatment step with aqueous sulphuric acid solution to decompose car bonate and acid consuming gangue compounds which might other wise inhibit a subsequent pressure ACID OXIDATION PRETREATMENT OF REFRACTORY Pretreatment Process on Refractory Gold Ores with As Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding 1) Arsenicbearing refractory gold ore has stones extremely difficult to deal with In the stones, gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic latticerefractory ore gold and pretreatment

(PDF) Refractory goldbearing ores: a review of

Batch and semicontinuous tests have already shown the viability of this process for the pretreatment of arsenopyritepyrite goldbearing concentrates [ 50 ] A refractory gold concentrate, assaying 20 ppm Au, 251 ppm Ag, 12% As, 158% Fe and 103% S has been tested gold in iron sulfide minerals such as pyrite and arsenopy rite Such deposits are called refractory gold ores due to the encapsulation of fine particles of gold in the ore host A clear boundary between refractory and nonrefractory ore in terms of gold recovery is not well defined, but several authors have pointed out that less than 60% goldEffect of Pretreatment of Sulfide Refractory Concentrate In this study, the amenability of a copperrich gold ore (108 g/t Au, 160% Cu) to cyanide leaching was investigated Direct cyanide leaching of the ore showed that the gold extraction was very low by 184% over 24 h, indicating that the ore is highly refractory Sulphuric acid pretreatment forINVESTIGATION OF THE AMENABILITY OF A COPPER

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