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Abstract Double refractory gold ores, such as Barrick's Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching. One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon. In this research, microwave roasting of a double refractory gold ore was investigated as an ...
Mar 01, 2015· 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 as-received ore extracted only 21% and 29% of silver and gold, respectively. •
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 [].Commonly, relatively high content of detrimental impurities like S (sulfur), As ...
Jan 01, 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).The latter mineral was identified to be the most important ...
Therefore, pretreatment of arsenic-bearing refractory gold has an extremely important significance. 3) In recent years, researches are 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.
The invention discloses a pretreatment method of refractory gold ore, which is characterized by comprising the following steps of: adopting a dry-wet two-level ball grinder activating and impregnation process; carrying out first-level dry grinding by adopting a vibratory ball grinder and efficiently improving the mineral activity on the basis of energy conservation through adjusting the ...
Developments in the pretreatment of refractory gold minerals by nitric acid D.-X. 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 gold
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 .
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 ...
Effect of Pretreatment of Sulfide Refractory Concentrate. Effect of Pretreatment of Sulfide Refractory Concentrate with Sodium Hypochlorite, Followed by Extraction of Gold by Pressure Cyanidation, on Gold Removal Diagnostic Pre-Treatment Procedure for Simultaneous Cyanide Leaching of Gold and Silver from a Refractory Gold Silver Ore, Minerals Engineering, Vol 24, No 15, 2011, pp 1703-1709
Provided is a method for pretreatment of gold ore in order to leach out gold from gold ore containing pyrite, with which it is possible to suppress the generation of sulfide dioxide and to improve the leaching rate of gold. A method for pretreatment in order to recover gold contained in gold ore containing pyrite (FeS 2 ) by wet treatment, the method containing a step in which pyrite in gold ...
Refractory Gold Ore And Pretreatment. We are a large-scale manufacturer specializing in producing various mining machines including different types of sand and gravel equipment, milling equipment, mineral processing equipment and building materials equipment.
Pretreatment Of Refractory Gold Ore With Microwaves. 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.
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) Arsenic-bearing refractory gold ore has stones extremely difficult to deal with. In the stones, gold is locked up in arsenic mineral matrix as the ...
For coarse grain size of gold after crushing and grinding by flotation, gravity concentration, cyanide leaching process or several process combined treatment will be able to complete the separation of gold and gangue minerals, but there are some curing refractory gold ores due to coarse size or thin and gangue minerals symbiosis relations complex factors through the above process unable to ...
Pretreatment Process on Refractory Gold Ores with As449 Кб. KEY WORDS: arsenic-bearing gold ore; pretreatment process; refractory gold ore.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 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) Arsenic-bearing refractory gold ore has stones extremely difficult to deal with.
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.
Response of microbial systems to thermal stress in biooxidation-heap pretreatment of refractory gold ores Implementation of sodium hydroxide pretreatment for refractory antimonial gold and silver ores A two-stage bacterial pretreatment process for double refractory gold ores
Refractory gold ores require either or both physical and chemical pre-treatment, prior to cyanidation. The proportion of known refractory gold resources relative to overall gold resources, is increasing year on year throughout the world. Albion Oxidation Process.
refractory gold ores with As. Pretreatment options for deal-ing with refractory gold ores are illustrated in Fig. 1 and described in detail in the subsequent sections. 2. Roasting Oxidation Pretreatment So far, the application of roasting oxidation pretreatment has a history of 70 years. The principle is to destroy the ores
The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of gold. The technological mineralogy of a gold deposit located in North-Western province of Zambia was carried out by using X-ray fluorescence spectroscopy (XRF), X-ray diffraction ...
The nitric acid pre-treatment experiments for refractory silver ore and gold/silver concentrate were performed for 2.5 hours at 5M HNO 3 and 80 o C. Before and after ...
This paper reviews recent progress in the use of microorganisms tooxidize the sulfidic matrix in refractory gold ores (bio-oxidation) and to solubilize elemental gold (bioleaching). ... Microbial pretreatment of refractory sulfide and carbonaceous ores improves the economics of gold recovery.
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