Selective alkaline leaching of antimony from Low-grade refractory gold

Selective alkaline leaching of antimony from Low-grade refractory gold ores and process optimization ... that the alkaline leaching process of pyroxene is mainly influenced by the contraction nucleation model (Pavel et al., 2012; Sajjad et al., 2021), but having great differences among different ores, which can be manifested in the apparent ...

Improved gold and silver extraction from a refractory …

The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching. The ore assayed 20 g/t Au and 220 g/t Ag and contained predominantly quartz/clay and barite, and to a lesser extent, …

Biological pretreatment of carbonaceous matter in double refractory

The pretreatment of carbonaceous material in double refractory gold ores (DRGO) is necessary to decrease preg-robbing of gold and maximize gold recovery. DRGO contains of carbonaceous matter and gold grains encapsulated in sulfide minerals, which typically results in very poor gold recovery.However, there is growing interest in DRGO because some estimates …

Effect of Oxidative Pretreatment and Lead Nitrate Addition on the

Cyanidation is the main process in gold leaching. There are several parameters that affect gold recovery and cyanide consumption. In this paper, the effect of the oxidative pretreatment and lead ...

Application Note Refractory Gold Pretreatment

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 …

ALTA Gold 2012 E-Doc

Refractory gold ores are those that do not yield high gold recoveries in conventional cyanide-leaching circuits, even when the ore is finely ground. The cause of low gold recoveries can be …

DEVELOPMENTS IN THE PROCESSING OF …

• Heap bioleaching of low grade refractory sulphide ores at elevated pH which reduces cost of neutralization ahead of cyanidation (BioHeap/Western Areas, Australia, paper at ALTA 2013 …

Review Pretreatment Process on Refractory Gold Ores with …

KEY WORDS: arsenic-bearing gold ore; pretreatment process; refractory gold ore. 1. Introduction Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding.1) Arsenic-bearing refractory gold ore has stones extremely difficult to deal with. In the stones,

Refractory Gold Ore Treatment Methods

The later development of flotation for gold ores, has, in most cases, provided a satisfactory pretreatment and has been applied in several ways. Flotation removes most of the freed carbon with the concentrate, which is then roasted …

Advancements in improving gold recovery from refractory gold ores

The term 'refractory gold ores' refers to gold ores characterised by a low extraction yield through cyanidation. Therefore, to improve the gold leaching efficiency, pretreatment techniques are necessary to overcome the refractoriness behaviour. This paper reviews various technologies applied to enhance gold recovery from refractory ores ...

Recent challenges in biological cyanidation and oxidation of …

One of the successful and excellent examples of the installation of heap biooxidation for the pretreatment of refractory gold ores was applied to the Agnes Gold Mine, ... Pradhan JK, Kumar S (2012) Metals bioleaching from electronic waste by Chromobacterium violaceum and Pseudomonads Sp. Waste Manag Res 30:1151–1159.

Sulphidic refractory gold ore pre-treatment by selective and bulk

In sulphidic refractory gold ores, fine gold particles may be highly disseminated and locked up in sulphide minerals such as pyrite and arsenopyrite [1]. All largely unoxidised ores exhibit very low gold recoveries (typically <20%) by direct cyanidation.

Refractory Gold Ore Treatment Methods

Microbial Pre-Treatment of Double Refractory Gold Ores

Mineral Processing and Extractive Metallurgy, 2012. Using iron and sulphur oxidising bacteria to catalyse the breakdown of sulphides that host the gold is an important biological method for the pretreatment of refractory gold ores. Following this biological treatment, a combination of chemical and physical methods is used for leaching (such as ...

Gold Extraction from a Refractory Ore Using Calcium …

The paper discusses the gold treatment methods on free milling ores with conventional cyanidation and refractory ores with direct and pretreatment techniques for the recovery of high gold values.

Getting a Handle on Refractory Ore May Determine Gold's Near …

According to a recent article by global consulting firm McKinsey, approximately one-quarter of the gold in geological reserves and resources can be considered refractory, with gold production from refractory ores expected to grow 1.4 % in the next four years, versus 0.3 % for non-refractory ores.

A Pretreatment of Refractory Gold Ores Containing Sulfide …

The use of thiosulfate to extract gold from refractory ores is promising because of its non-toxicity and high selectivity. Sulfide minerals (i.e., pyrite, arsenopyrite, chalcopyrite), major gold carriers in refractory gold ores, however, hinder gold extraction due to the high consumption of a lixiviant. In this study, a new method to improve gold extraction from sulfide bearing gold …

Mineralogical characteristics and treatment of refractory gold ores

Refractory gold ores and concentrates are characterised by low gold recoveries and high cyanide consumptions when subjected to direct cyanide leaching. Therefore an oxidation pretreatment step is required before cyanidation that will break up the sulphide lattice and render gold particles accessible to cyanide ions. The main three options for ...

Influence of potassium hydroxide pretreatment on the extraction of gold

2011. The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching. The ore assayed 20 g/t Au and 220 g/t Ag and contained predominantly quartz/clay and barite, and to a lesser extent, sulphides such as pyrite, stibnite, sphalerite, zinkenite (Pb 9 Sb 22 S 42 ) and andorite (Sb 3 PbAgS 6 ).

EVALUATING PROCESS OPTIONS FOR TREATING …

Demonstration of economic treatment options allows gold companies to maintain and increase their ore reserves. The selection of …

Nitric Acid Pretreatment Applied to a Refractory Gold-Tellurides Ore

This paper presents the results obtained by processing a gold and silver telluride mineral concentrate from a mine in Colombia. An acid wash, also known as acidification, was carried out, followed by oxidation with nitric acid as a pretreatment. Cyanidations of the pretreatment residues were carried out and the results were compared with results from cyanidations of base …

Nitric Acid Pretreatment Applied to Refractory Gold …

nitric acid in the pretreatment of refractory gold ores (Nitrox and Arseno/Redox process) [16– 18]. The values for the C variable (agitation speed) were chosen in a range suitable to

Pretreatment of a refractory arsenopyritic gold ore using hydroxyl ion

Request PDF | On Mar 31, 2015, Sandra L. Mesa Espitia and others published Pretreatment of a refractory arsenopyritic gold ore using hydroxyl ion | Find, read and cite all the research you need on ...

CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING …

Keywords: refractory gold ore, oxidative pre–treatment, non ... 2012), mainly due to the failure of cyanidation for extracting gold from the refractory ores, long leaching times (more than 24 ...

Improved gold and silver extraction from a refractory …

Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach Oktay Celep, İbrahim Alp⁎, Hacı Deveci Department of Mining Engineering ...

Gold Extraction from a Refractory Ore Using Calcium …

Conventional leaching, the standard method for gold extraction, involves using a cyanide solution to dissolve gold from the ore. However, this process is often ineffective for refractory ores due to the presence of sulfide minerals. This study aims to improve the efficiency of gold extraction from refractory ores by introducing an oxidative pretreatment step using a …

Nitric Acid Pretreatment Applied to a Refractory Gold-Tellurides Ore

Potassium hydroxide alkaline pretreatment of a refractory gold-silver ore containing 20 g/t Au and 220 g/t Ag was investigated with the purpose to evaluate its effectiveness on the extraction of gold and silver. ... Zárate-Gutiérrez R, Lapidus GT, Morales RD (2012) Aqueous oxidation of galena and pyrite with nitric acid at moderate ...

The mechanism of ultrasound oxidation effect on the pyrite for

In our previous studies, the introduction of ultrasound in alkaline solution during the pretreatment stage of gold ore significantly increases the leaching rate of gold from refractory ore (Zhang et al., 2016). Though the application of ultrasound rises great attention in recent year, but few researches are focus on the mechanism of ultrasound ...

Oxidation of sulfide mineral and metal extraction analysis in the

Pretreatment and processing of refractory gold ore are becoming increasingly important and an inevitable trend for gold development due to the depletion of high-grade ores (Mabwe, 2020). Extraction of gold from refractory gold ore without any side reactions is a highly desirable process in the future ( Qin, Guo, Tian, & Zhang, 2021 ).

Unlock Refractory Gold with ALS: Cutting-Edge Pre …

ALS offers expert solutions for refractory gold ore processing. Our advanced pre-treatment options and customized testing programs ensure maximum gold extraction efficiency.