pretreatment of refractory ores prior to gold leaching

INVESTIGATION OF THE AMENABILITY OF A COPPER-RICH ...

In this study, the amenability of a copper-rich gold ore (108 g/t Au, 1.60% Cu) to cyanide leaching was investigated. Direct cyanide leaching of the ore showed that the gold extraction was very low by 18.4% over 24 h., indicating that the ore is highly refractory. Sulphuric acid pretreatment for

pretreatment of refractory ores prior to gold leaching

Bioheap pretreatment of sulfidic refractory gold ore prior to cyanide leaching is a promising new technology, especially for low-grade ores that cannot be oxidized by pressure leaching or roasting. Ores containing both refractory and amenable gold require economic decisions whether, or not, to pretreat before cyanide leaching.

Effect of Oxidative Pretreatment and Lead Nitrate Addition ...

 · 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 nitrate addition on the cyanidation of Zarshuran refractory gold ore containing 3.32 ppm Au, 1.09% As, and 0.5% sulfur were investigated. Au recovery was increased from 79.4% to 89.4% in the …

Pretreatment Of Refractory Ores Prior To Gold Leaching

Refractory Ore Gold And Pretreatment 2012. pretreatment of refractory ores prior to gold leaching Refractory gold ore pretreatment Treatment of refractory gold ore whole ore and flotation concentrates has become more prominent since the 1980s with many gold discoveries often including ores that are wholly or partially refractory Refractory pre treatment processes include pressure …

Pretreatment Of Refractory Ores Prior To Gold Leaching ...

Pretreatment Of Refractory Ores Prior To Gold Leaching Crushing Ore Copper Ore. If you are interested in our products, you can consult or leave a message below, we will provide you with value-for-money equipment and thoughtful service. Send Email: [email protected] send Message Chat Online

pretreatment of refractory ores prior to gold leaching

Review Pretreatment Process on Refractory Gold Ores with As. reach it in cyanide leaching process 2) The gold ores with As must be broken or decomposed in the gold particles scales, so that gold is fully exposed, and then extracted with the appropriate gold leaching agent The process of crushing or decomposition before gold leaching is called pretreatment of refractory gold

US4559209A

A method is disclosed for leaching a gold ore which is refractory due to the presence of sulphide minerals of arsenic and antimony. The ground ore is leached with cyanide in a pipe reactor at a pressure of between 5 and 8 MPa. The terminal pH value of the pulp is controlled to be 10 or less than 10.

BACTERIAL LEACHING AS A PRE-TREATMENT STEP FOR …

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

Alkaline sulfide pretreatment of an antimonial refractory ...

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. This paper presents the alkaline sulfide pretreatment of an antimonial refractory gold and silver ore. In the ore, gold occurs mainly as gold-silver ...

pretreatment of refractory ores prior to gold leaching

One. Pretreat the refractory gold. The gold leaching rate of most refractory gold ores is about 10% ~ 20% when they are directly stirred by sodium cyanide. Generally, the gold leaching rate of refractory gold ore can be greatly improved by pretreating the raw materials, including oxidative roasting, hot-pressure oxidation, biological oxidation. 1.

Potential pre-treatment and processing routes for recovery ...

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) Bacterial Leaching as a Pre-treatment Step for Gold ...

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 ...

Pretreatment Of Refractory Ores Prior To Gold Leaching

Ultrafine grinding was proposed as a pretreatment method prior to cyanide leaching of a gold-silver ore. About 91.92% Au and 82.15% Ag were extracted after ultrafine grinding under optimum leaching conditions such as 150 kg t −1 quicklime dosage, 25% pulp density, 85 °C leach temperature, 500 g t −1 cyanide concentration and 90 h leaching ...

refractory gold pretreatment

Pretreatment Process on Refractory Gold Ores with As. The process of crushing or decomposition before gold leaching is called pretreatment of refractory gold. Statistics show that, in the world, about 2/3 gold resource belongs to the difficult processing ores, and about 1/3 total output of world gold is produced from refractory gold.

pretreatment of refractory ores in gold leaching process con

pretreatment of refractory ores prior to gold leaching . Gold Refractory Ore Pretreatment ... Conference Proceeding ... to render such ores amenable to gold leaching by ... 4,038,362 discloses a process for the pretreatment ...

An evaluation of pretreatments to increase gold recovery ...

 · Prior to actual leaching, and if needed, the pH of the prepared pulps was readjusted to 10.5. ... 1976, 15(4), 333-344. Berezowsky, R.M.G.S. and Weir, D.R., ressure Oxidation Pretreatment of Refractory Gold In Proc. of Practical Hydrometallurgy 83: Annual Symposium on Uranium and Precious Metals, Fort Saskatchewan, Alberta Canada, 1983, pp 101 ...

Refractory gold ores: Challenges and opportunities for a ...

 · Gold miners are facing a reserves crisis, and what is left in the ground is becoming more and more challenging to process.Refractory gold reserves, which require more sophisticated treatment methods in order to achieve oxide-ore recovery rates, correspond to 24 percent of current gold reserves and 22 percent of gold resources worldwide (Exhibit 1).

Developments in the pretreatment of refractory gold ...

mineralogy of ores being encountered in which gold is locked up in various sulphidic host minerals. Gold ores are classified as highly refractory when at least 80% of the gold cannot be extracted by conventional cyanidation leaching even after fine grinding. A very common cause of refractoriness is the dissemination of fine grained or

pretreatment of refractory ores prior to gold leaching ghana

pretreatment of refractory ores prior to gold leaching ghana. As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.

Pretreatment Process on Refractory Gold Ores with As

The process of crushing or decomposition before gold leaching is called pretreatment of refractory gold. Statistics show that, in the world, about 2/3 gold resource belongs to the difficult processing ores, and about 1/3 total output of world gold is produced from refractory gold. This proportion will further increase in future.

pretreatment of refractory ores prior to gold leaching

Characterization of refractory behaviour of complex gold. of such an ore and for the identification of possible pretreatment options to overcome its refractoriness prior to cyanide leaching Key words gold and silver ores refractoriness characterization diagnostic leach 1 Introduction Generally gold ores can be classified as free milling and refractory depending on their response to...

Improvement of Gold Leaching from a Refractory Gold ...

energy consumption. As a result, proper pretreatments are necessary to improve the leaching of gold from these refractory gold ores [5,6]. The pretreatment of oxidative roasting has always been one of the most extensively used methods in China attributing to its mature technique, high efficiency, energy conservation, etc. [7,8] Effective ...

Water Washing of Fungal-treated Carbonaceous Ores: Effect ...

Refractory gold ores must necessarily undergo pretreatment processes so as to improve upon overall gold recovery. Mineralogy and other specific characteristics of refractory gold ores play a vital role when considering an appropriate technique for processing these gold ores. Bacterial oxidation of sulphide minerals is a familiar and ...

pretreatment of refractory ores prior to gold leaching

Pretreatment Of Refractory Ores Prior To Gold Leaching. Pretreatment of refractory ores prior to gold leaching pretreatment of refractory ores prior to gold leaching xsm is a leading global manufacturer of crushing and. Chat Online Improvement Of Gold Leaching From A Refractory Gold Concentrate Calcine By Separate Pretreatment. Live Chat

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, sulphides such as pyrite, stibnite, sphalerite, zinkenite (Pb9Sb22S42) and andorite (Sb3PbAgS6).

Improvement of Gold Leaching from a Refractory Gold ...

Refractory gold ores have increasingly been the main source of gold production with the exhaustion of amenable gold ores. Of the 2630 tons of total world gold production in 2011, about 25% was produced from refractory gold deposits, and of the top 20 gold operations in 2011, eight were processing refractory ores [] monly, relatively high content of detrimental impurities like S (sulfur), As ...

(PDF) A Preliminary Study on Nitric Acid Pre-treatment of ...

This study was undertaken to evaluate the nitric acid leaching as a potential pre - treatment. process prior to cyanidation of refractory gold/silver ores. The nitric acid pre - treatment ...

pretreatment of refractory ores prior to gold leaching

Pretreatment Of Refractory Ores Prior To Gold Leaching. Pretreatment Of Refractory Ores Prior To Gold Leaching. The free-milling gold ores are being exhausted and the refractory ores are being discovered and processed.The number of new methods receives more and more attention from the metallurgist because its help to solve various prob-lems during processing.The refractory ore was …

Alkaline sulfide pretreatment of an antimonial refractory ...

 · 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. This paper presents the alkaline sulfide pretreatment of an antimonial refractory gold and silver ore. In the ore, gold occurs mainly as gold-silver ...

Pretreatment Of Refractory Ores Prior To Gold Leaching

Gold recovery: Effect of ozonation on refractory gold ores. leaching of refractory ores results in incomplete gold recoveries, as a solution, a pre-treatment process should be implemented. Various pre-treatment, methods includes roasting, bio- oxidation, high-pressure cyanide leaching …

Pretreatment/agglomeration as a vehicle for refractory ore ...

The leach ratio is a rough, but reliable, measure of the percentage gold recovery that can be expected to be obtained from gold ores via standard cyanide leach operations. The leach ratio is considered to be a rough measure of the relative refractory nature of gold ores with the refractoriness varying in inverse proportion to the leach ratio.

Pretreatment Of Refractory Ores Prior To Gold Leaching

Pretreatment Of Refractory Ores Prior To Gold Leaching. The free-milling gold ores are being exhausted and the refractory ores are being discovered and processed.The number of new methods receives more and more attention from the metallurgist because its help to solve various prob-lems during processing.The refractory ore was destroyed or attacked by extensive pretreatment prior to the ...

pretreatment of refractory ores prior to gold leaching

 · Pretreatment Of Refractory Ores Prior To Gold Leaching XSM is a leading global manufacturer of crushing and milling equipment (Pretreatment Of Refractory Ores Prior To Gold Leaching),XSM also supply individual (Pretreatment Of Refractory Ores Prior To Gold Leaching,) crushers and mills as well as spare parts of them. live chat

pretreatment of refractory ores prior to gold leaching

pretreatment of refractory ores prior to gold leaching; Ultrasoundintensified Leaching of Gold from a Refractory Ore. The freemilling gold ores are being exhausted and the refractory ores are being discovered and processed. The number of new methods receives more and more attention from the metallurgist because its help to solve various ...

pretreatment of refractory ores prior to gold leaching

pretreatment of refractory ores in gold leaching process congo;, pre-treatment of refractory gold ore should increase the gold recovery rate in the cyanide leach process by 30-40% in order to be economical", These types of ores require pretreatment prior to cyanidation Options for pretreatment include the following processes.

pretreatment of refractory ores in gold leaching process ...

pretreatment of refractory ores in gold leaching process congo. ... Gold Ore Beneficiation Plant. Copper ore beneficiation plant. Iron Ore Beneficiation Plant. 20TPH vertical mill for limestone desulfurization in power plant. 325mesh calcium carbonate production line MTW trapezium mill.

The reasons of gold refractory, Gold ore classification ...

 · The reason of the gold mineral refractory There are so many types of reasons that caused the difficulty of gold ore processing, including physical element, chemical element, and mineralogical element.