Intensified Alkaline Leaching Pretreatment Of Refractory Gold-GOLD MINING

MINING

Ultrasoundintensified Leaching of Gold from a Refractory Ore .

The leaching kinetics of antimony from refractory gold ore in alkaline sodium sulfide was investigated under ultrasound. The influence of factors such as stirring speed, temperature, the .

Pretreatment and thiosulfate leaching of refractory gold .

A hydrometallurgical process for refractory goldbearing arsenosulfide concentrates at ambient temperature and pressure was presented, including fine grinding with intensified alkalileaching FGLAL , enhanced agitation alkalileaching EAAL , thiosulfate leaching and displacement. Experimental results on a refractory gold concentrate showed that the total consumption of NaOH in alkaline .

Review Pretreatment Process on Refractory Gold Ores with As

3.1. Alkaline Leaching Pretreatment Alkaline leaching pretreatment is a chemical pretreatment process which can oxidize and dispose of components of the ore through adding chemical reagents. Meng Yuqun, Wu Minjie, etc. have researched to strengthen Fig. 1. General process options for pretreating refractory gold ores. Fig. 2.

Ultrasoundintensified Leaching of Gold from a Refractory Ore

ultrasoundintensified leaching. The leaching ratio of gold increased with an increasing of NaCN concentration from 6 to 18 kg/t. The results demonstrated that the ultrasound is a viable extractive metallurgy technique in pretreatment and leaching for the refractory gold ores. KEY WORDS: gold ore intensified leaching ultrasound. 1. Introduction

Refractory Gold Ore Treatment Methods

Leaching and Recovering Gold from Antimony Minerals Stibnite Antimony Sulphide, Sb2S2 This mineral in an ore acts as a weak acid, combining with alkalis to form salts, of the order of M1/3SbS2 and M1/3SbS4 alkaline sulphantimonite and sulphantimonate, especially in the presence of iron sulphides, using high concentrations of lime or alkalis.

Leaching Kinetics of Antimony from Refractory Gold Ore in .

The leaching kinetics of antimony from refractory gold ore in alkaline sodium sulfide was investigated under ultrasound. The influence of factors such as stirring speed, temperature, the concentration of sodium hydroxide and sodium sulfide and particle size, was studied.

Pretreatment of a refractory arsenopyritic gold ore using .

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. Up to 81 of the gold and 50 of the silver were recovered after .

Pretreatment and thiosulfate leaching of refractory gold .

A hydrometallurgical process for refractory goldbearing arsenosulfide concentrates at ambient temperature and pressure was presented, including fine grinding with intensified alkalileaching FGLAL , enhanced agitation alkalileaching EAAL , thiosulfate leaching and displacement. Experimental results on a refractory gold concentrate showed that the total consumption of NaOH in alkaline .

Optimizing the alkaline oxidation pretreatment of a .

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 126516 View the article online for updates and enhancements. Recent citations Synergistic effect of reduction leaching of manganese anode slime and oxidation

Leaching Kinetics of Antimony from Refractory Gold Ore in .

The leaching kinetics of antimony from refractory gold ore in alkaline sodium sulfide was investigated under ultrasound. The influence of factors such as stirring speed, temperature, the concentration of sodium hydroxide and sodium sulfide and particle size, was studied.

Implementation of sodium hydroxide pretreatment for .

These findings suggest that alkaline sulfide leaching can be suitably used as a chemical pretreatment method prior to the conventional cyanidation for antimonial refractory gold and silver ores .

Optimization of the synergy between reduction leaching of .

A new process for extracting gold from refractory gold ore and manganese from manganese anode slime was developed by combining the oxidative pretreatment of refractory gold ore and reductive leaching of manganese anode slime. The response surface methodology was used to optimize the effects of time, temperature, and sulfuric acid concentration on the leaching efficiency of manganese. The .

The development of a caustic preleaching step for the .

Celep and Serbest 2015 showed that a pretreatment of an iron oxy/hydroxide bearing refractory gold/silver ore in potassium hydroxide solution, improved the extraction of silver and gold up to 87 Ag and 90 Au. Meng 2005 studied the intensified alkaline grindingleaching followed by thiosulphate leaching of arsenopyrite and pyrite ores .

COMPARISON OF CYANIDE AND THIOSULPHATE LEACHING FOR GOLD .

Before leaching the gold, ore must be crushed and grinded into small particles, usually particle size varies between 30 and 180 m. Free milling ores are ready for leaching after crushing and grinding whereas refractory ores need pretreatment. It is important to pretreat a refractory ore before leaching to achieve better gold extraction.

PDF A Preliminary Study on Nitric Acid Pretreatment of .

Effect of nitric acid pretreatment on the extraction of silver from the ground ore d 80 : 50 m in cyanide leaching Cyanidation conditions: 1.5 g/L NaCN, pH 10.5, 25 3 C, flow rate of air: 1 .

Alkaline sulfide pretreatment of an antimonial refractory Au .

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 andorite. Alkaline sulfide pretreatment was shown .

Alkaline Oxidative Leaching of GoldBearing Arsenopyrite Ores

ALKALINE OXIDATIVE LEACHING OF GOLDBEARING ARSENOPYRITE ORES By P. Bhakta,1 J. W. Langhans, Jr.,1 and K. P. V. Lei2 ABSquotrRACT The U.S. Bureau of Mines developed an alkaline oxidative pretreatment leaching procedure to increase the recovery of gold from arsenopyrite FeAsS ores. The best solution compositions for

International Journal of Minerals, Metallurgy and Materials

The dissolution of gold is increased to 91.9 from 4.6 by cyanide without the pretreatment. The displacement of gold by zinc powder in the solution gets to 99.2. Due to an amount of thiosulfate selfgenerated during alkaline leaching, the reagent addition in thiosulfate leaching afterwards is lower than the normal.

Atmospheric alkaline preoxidation of refractory sulphide .

Atmospheric alkaline preoxidation of refractory sulphide gold ores. Creator. Rego, Alan Joseph. Publisher. University of British Columbia. Date Issued. 2018. Description. Four ironsulphidecontaining gold ores from the White Mountain mine in the Jilin Province, China were studied to examine the benefits of using oxidative treatment prior to .

Potential pretreatment and processing routes for recovery of .

2.1 Microwave pre treatment of refractory gold ores . Most of refractory gold occurs within sulphide minerals such as FeS 2 and FeAsS and are treated by roasting, pressure leaching or bacterial leaching to render the gold amenable to recovery by subsequent treatment techniques Haque, 1987 .

Nitric Acid Treatment of Olympiada Deposit Refractory Gold .

This article covers acid nitric leaching of Olympiada deposit refractory goldbearing concentrate after alkaline leaching of stibnite. Thermodynamic analysis of the reaction pyrite and arsenopyrite with nitric acid chemical equations was performed.

PDF 24Alkaline sulphide pretreatment JOM ibrahim alp .

Alkaline sulfide pretreatment of an antimonial refractory AuAg ore for improved cyanidation By Haci Deveci and ibrahim alp Implementation of sodium hydroxide pretreatment for refractory antimonial gold and silver ores

CN104805281A Method for leaching sulfide gold concentrate .

The invention relates to a method for leaching sulfide gold concentrate by virtue of combination of acid pressure leaching and alkali pressure leaching. The method comprises an acid pressure leaching pretreatment stage and an alkali pressure leaching stage firstly, in an acid pressure leaching process, reaction conditions are controlled, so that sulfides are oxidized, part of elemental sulfur .

Potential pretreatment and processing routes for recovery of .

2.1 Microwave pre treatment of refractory gold ores . Most of refractory gold occurs within sulphide minerals such as FeS 2 and FeAsS and are treated by roasting, pressure leaching or bacterial leaching to render the gold amenable to recovery by subsequent treatment techniques Haque, 1987 .

PDF Pretreatment of arsenicbearing gold ore with microwave .

DOI: 10.1515/gps20150122 Corpus ID: 101431560. Pretreatment of arsenicbearing gold ore with microwaveassisted alkaline leaching article Ma2016PretreatmentOA, title Pretreatment of arsenicbearing gold ore with microwaveassisted alkaline leaching , author Hongzhou Ma and Chao Yan and Yaoning Wang , journal Green Processing and Synthesis , year 2016 , volume 5 , pages 269 273

Gold recovery from refractory gold concentrates by pressure .

that gold recovery is difficult by thiosulfate leaching without any pretreatment, and the recovery of gold only is 10.1. After roasting and oxidizing, the gold leaching rate increases substantially. The leaching rate of gold reaches 71.2 with the optimal leaching technological parameters Li et al., 2013 .Leaching of the gold was difficult .

The reasons of gold refractory, Gold ore classifi ion, and .

In the heat, using alkaline air oxidation method is easier to complete alkaline preoxidation for pyrrhotite, so makes gold easier to cyanide and leach. 4. Telluride and sulfursalt gold ore

Effect of Pretreatment of Sulfide Refractory Concentrate with .

For extraction of gold from refractory ores or concen trate, in which gold is surrounded or covered by iron sul fide minerals, mainly arsenopyrite and pyrite, mineral oxidative pretreatment is essential to oxidize sulfides and to expose gold to the leaching solution. Pyrometallurgi cal oxidation by roasting is under environmental restric

CA1245057A Gold recovery process Google Patents

GOLD RECOVERY PROCESS Abstract of the Disclosure A process for treating refractory ores combines pressure oxidation treatment of the ore with cyanidation and carboninpulp recovery. Pressure oxidation is carried out under acidic conditions, at elevated temperatures and pressure.

Basic theory and optimization of gold containing antimony .

study. The main chemical composition of the ore sample is shownin Table 1. The leaching rate of gold will be weak due to the influence of antimony if direct leaching gold is carried out by cyanide. As is well known, Asbearing gold ore is leached ineffectively. Thus, the ore was refractory gold ore because the content of As was 2.73.

leaching cyanidation of gold ore bostonenglish.pl

5 Intensified Cyanide Leaching Methods You Need to Know. Intensified gold cyanide leaching technology can effectively increase the cyanogold reaction rate, increase the gold recovery rate and reduce the amount of sodium cyanide. For gold cyanidation, the methods used vary from one gold ore type to another.

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Intensified Alkaline Leaching Pretreatment Of Refractory Gold