Because gold in such ores is very fine particle form wrapped with arsenic, the leach reagents are unable to 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 ofChat Online
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Mar 01, 2013 Often, the gold bearing ores are refractory due to the gold grains and concentration by flotation is necessary, either followed by roasting, bacterial leaching, or pressure leaching in a way that the gold is liberated prior to cyanidation . Two basic initial approaches are available either treating the whole ore or processing some form of concentrate with a high proportion of the recovered gold.+
recovery from the refractory sulfide gold ores. An oxidative pretreatment of the ore is essential to oxidize the sulfides and expose gold. The conventional methods of extraction of refractory sulfide gold ores usually follow roasting-leaching and electrowinning steps. Roasting is one oxidative pretreatment+
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. 1 and+
Specifically, according to the chemical phase analyses of gold in the concentrate see Table 2, the gold concentrate belongs to a refractory sulfidic carbonaceous gold ore chiefly due to the encapsulation of gold by associated sulfides mainly pyrite and arsenopyrite and the preg robbing of gold by carbonaceous matters mainly simple substance C. After two-stage oxidative roasting, most of the S 93.84, As 71.40 and C 98.27 in the gold+
Jan 01, 2011 The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching. The ore assayed 20 gt Au and 220 gt Ag and contained predominantly quartzclay 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+
Classification of refractory ores. 1. Carbonaceous gold ore. There is organic carbon which can do Rob gold in gold and silver ore, and it causes that gold is adsorbed in the cyanide solution, make ore difficult to cyanide and leach. Generally, we use roasting and chlorination pretreatment+
Mar 01, 2013 Often, the gold bearing ores are refractory due to the gold grains and concentration by flotation is necessary, either followed by roasting, bacterial leaching, or pressure leaching in a way that the gold is liberated prior to cyanidation . Two basic initial approaches are available either treating the whole ore or processing some form of ...+
The problem of refractory sulfide gold ore that has a gold recovery less than 50 when direct cyanidation applied, still exists until now. It needs oxidative pretreatment for cyanidation to be effective in gold recovery the objective of this study is figuring out the effect of sodium nitrite as an oxidizing reagent on cyanidation of refractory gold ore.+
2007. Pretreatment with Ozone for Gold and Silver Recovery from Refractory Ores. Ozone Science amp Engineering Vol. 29, No. 2, pp. 101-105.+
Jan 01, 2011 The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching. The ore assayed 20 gt Au and 220 gt Ag and contained predominantly quartzclay 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 ...+
57 Claim 1. A process for recovering gold from refractory auri- ferous iron-containing suiphidic ore comprising feeding ground ore as an aqueous slurry to an acidic pretreatment step, treating the ground ore in the acidic pretreatment step with aqueous sulphuric acid solution to decompose car- bonate and acid consuming gangue compounds which might other- wise inhibit a subsequent pressure ...+
In this work ozonization was studied as pretreatment for two Mexican refractory ores in order to increase the gold and silver extraction. Two methods for contacting ozone with the mineral were ...+
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+
1 day ago Despite numerous reported studies on improved gold extraction by cyanide leaching from complex low grade ores 9,10,11,12,13,14,15,16, there is still a lack of fundamental knowledge and understanding on the interplay between refractory ore-specific primary and secondary mineral phases, solution chemistry, and the particle-solution ...+
For high grade ores or refractory sulfide ores where some pretreatment processing is required to liberate gold, the in-situ generation of thiosulfate should be investigated in more detail.+
refractory ore gold and pretreatment 2012 4.6 - 3717 Ratings The Gulin product line, consisting of more than 30 machines, sets the standard for our industry. We plan to help you meet your needs with our equipment, with our distribution and product support system, and+
TY - JOUR. T1 - Fungal pretreatment of sulfides in refractory gold ores. AU - Ofori-Sarpong, G. AU - Osseo-Asare, Kwadwo Asare. AU - Tien, Ming+
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.+
Aeration curing, over a long duration in wetted stockpiles, shows promise as an affordable pretreatment method for oxidizing gold encapsulating sulfide minerals, and possibly organic matter, in low grade refractory ores. Following aeration pretreatment, the ore is reclaimed, neutralized, and cyanide leached by conventional practices. Large tonnages of subeconomic material, including mine ...+
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 ...+
DMI Refractory Gold Process Ecorefractory.com A A refractory gold ore is one in which the gold is not amenable to recovery by conventional cyanide methods ... Read more pretreatment of refractory ores prior to gold leaching+
Figure 5 - Refractory Ore Pretreatment Options. In order to choose a pretreatment option for a refractory ore, the main concern is attaining a solution which succeeds in preparing the ore for cyanidation, whilst remaining economically feasible. Mill Sizing. The ore throughput rate of a mill is largely dependent on the mining production rate.+
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 1.+
The U.S. Bureau of Mines developed an alkaline oxidative pretreatment leaching procedure to increase the recovery of gold from arsenopyrite FeAsS ores. ... low-grade gold ore and a bulk sulfide flotation concentrate prepared from it. Cyanidation of the leach ... their possible applications to treat refractory gold ores+