study on pretreatment of arsenic containing refractory gold

Review Pretreatment Process on Refractory Gold Ores with As

mainly about the refractory gold leaching easily through arsenic removal to expose gold, changing the composition, physic-chemical and electro-chemical properties of the ore. Currently, there are four main methods of pretreatments of refractory gold ores with As. Pretreatment options for deal-ing with refractory gold ores are illustrated in Fig ...

One Novel two-step Bio-Oxidation Pretreatment of Arsenic ...

oxidation process of arsenic-pyrite refractory gold material prior to cyanidation [21, 23]. To date, there are few reports on bio-oxidation pretreatment regarding arsenic-containing concentrate. Therefore, in this work, the pretreatment of one high arsenic gold-bearing concentrate by the two-step bio-oxidation

Pretreatment Process on Refractory Gold Ores with As

The problem of the refractory nature of gold bearing arsenide ores is described. The basic principle, characteristics and application of pretreatment technique of arsenic-bearing gold ores are...

A Study on intensified alkaline leaching pretreatment ...

This new pretreatment method is a synthetic physical and chemiscal method .In a tower type grinding and leaching mill,the Yangshu arsenic-containing refractory gold concentrate is ground to 97.38%~33.56μm, then be intensified leaching to 12h by 144kg/t NaOH in a forced agitator tank with the pulp conc. of 40% wt at temperature of 13~15℃ and normal pressure (1atm).The arsenic particles ...

Mineralogy and Pretreatment of a Refractory Gold Deposit ...

According to the results of process mineralogy, the reasons for the low efficiency of beneficiation and the possibility of removing arsenic from gold concentrate are analyzed, and a suitable pretreatment process is proposed to recover the refractory gold ore reasonably and efficiently. Table 1. Chemical analysis of the raw ore (mass fraction, %).

Pressure Oxidation Pretreatment of Refractory Gold ...

Pressure oxidation of gold containing concentrates and ores is an effective pretreatment for liberating refractory gold. This is particularly true when an appreciable portion of the gold is associated with sulfides and is not amenable to conventional cyanidation. A brief review of the literature on pressure oxidation of refractory gold materials is presented.

Optimizing the alkaline oxidation pretreatment of a ...

Sep 28, 2018 · This study investigates the alkaline oxidation pretreatment process of Zarshuran refractory gold ore. Taguchi method-orthogonal array design (OAD) is applied to evaluate and optimize the influence of five main factors including solution pH, …

Developments in the pretreatment of refractory gold ...

DEVELOPMENTS IN THE PRETREATMENT OF REFRACTORY GOLD MINERALS BY NITRIC ACID 149 Feed material is mixed with water and nitric acid to the desired solids concentration in the feed tank and is fed into the fluidized bed via a positive displacement pump.

Pretreatment of a refractory arsenopyritic gold ore using ...

Mar 01, 2015 · A sodium hydroxide pretreatment at ambient temperature was evaluated to increase gold extraction from a high-grade arsenopyrite mineral. A 2 k factorial experimental design was established, with the following variables: NaOH concentration (0.1–3 M), solid concentration (40–200 g/L) and treatment time (6–48 h). After applying the pretreatment, standard leaching tests with thiosulfate ...

(PDF) Mineralogy and Pretreatment of a Refractory Gold ...

Mineralogy and Pretreatment of a Refractory Gold Deposit in Zambia ... study were obtained from an arsenic-containing sulfur-bearing gold. ... results of mineralogy study, gold partic les had a ...

Removal of arsenic and sulfur from a refractory gold ...

In this study the removal of sulfur and arsenic from a refractory flotation gold concentrate by microwave heating was investigated. The results showed that cooling pattern of the heated products, heating time, temperature and atmosphere had significant effect on the removal of sulfur and arsenic.

Study on Pre-oxidation of a High-Arsenic and High-Sulfur ...

For arsenic-containing refractory gold concentrate, gold recovery by leaching is extremely difficult due to the encapsulation of gold in arsenopyrite and pyrite. In this work, the pre-oxidation of a high-arsenic and high-sulfur refractory gold concentrate in the acidic potassium permanganate or hydrogen peroxide solutions has been investigated.

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, and …

Implementation of sodium hydroxide pretreatment for ...

Recent studies demonstrated that sodium hydroxide pretreatment is a viable extractive metallurgy technique for the processing of refractory antimonial gold and silver ores containing zinkenite and ...

Pretreatments Applied to Refractory Gold Ores | Request PDF

It is necessary to apply a pretreatment to obtain high gold recovery (>80%) from such refractory ores by cyanide leaching. There have been many studies on the oxidation of refractory gold ores for ...

(PDF) The treatment of arsenic bearing ores, concentrates ...

As an example, when the alkaline sulfide hydrometallurgical system is applied to a common arsenic containing material like enargite, Cu 3 AsS 4 , which usually contains considerable gold, a ...

(PDF) Cyanidation of gold ores containing copper, silver ...

the kinetics of gold dissolution (Stoychevski and Williams, 1993; Roasting, pressure oxidation, biooxidation, ultrafine grinding and Deschenes and Prud home, 1997). modified cyanidation are the pretreatment methods currently In this study, main cyanidation parameters for two different gold practiced for refractory gold ores and concentrates ...

Catalytic Oxidation Pretreatment of Sulfide-Rich Arsenic ...

This paper summarizes the result of experiment that was fourced on investigation of oxidation pretreatment on sulfide mineral for leaching of refractory gold concentrate by hydrogen peroxide in sulfuric acid. For a viable option, extraction rate of Fe, Cu was low, but extraction rate of arsenic reached nearly 100%. As the result of oxidation, elemental sulfur was not produced.

(PDF) Bacterial leaching as a pre-treatment step for gold ...

Fizykochemiczne Problemy Mineralurgii, 32 (1998), 173–181 Alper ÖZKAN*, Salih AYDOGAN*, Ünal AKDEMIR* BACTERIAL LEACHING AS A PRE-TREATMENT STEP FOR GOLD RECOVERY FROM REFRACTORY ORES In this article, pre-treatment such as bio-leaching before cyanidation is discussed as an alternative technique to treat refractory gold ores containing pyrite and arsenopyrite.

STUDY ON MICROWAVE PRETREATMENT OF REFRACTORY ...

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 ...

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