- منطقة بودونغ الجديدة ، شنغهاي ، الصين .
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on the Cyanidation of Refractory Gold Ore FARAZ SOLTANI,1,5 MEHDI MARZBAN,2 HOSSNA DARABI,3 MOKHTAR AAZAMI,4 and MOHSEN HEMMATI CHEGENI1 1.—Department of Mining Engineering, Arak University of Technology, Arak, Markazi, Iran. ... oxidation in an alkaline pre-aeration process, asso-ciated with the …
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In contrast, gold in refractory sulfide ores occurs mainly as minute particles and submicroscopic gold, and microscopic gold usually accounts for an insignificant portion. In gold ores containing carbonaceous material, the preg-robbing nature of carbonaceous material may impose challenges on gold extraction and cause gold losses.
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The leaching behaviour of a sulphide gold-silver ore was investigated in terms of a relationship between gold and silver extractions and cyanide consumption. Ninity five Au % and 88.0% Ag extractions were obtained under the determined conditions of
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Pre-aeration and Ore Washing. In some ores, particularly partially sulfidized ores, aeration (prior to the introduction of cyanide) of the ore in water at high pH can render elements such as iron and sulfur less reactive to cyanide, and therefore the gold cyanidation process more efficient.
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What is the Effect of Aeration on Gold and Silver Leaching. ... However, some ores contain cyanicides that necessitate pre-, that is, grinding in alkaline water. These solutions are then thickened to remove this deleterious material before the cyanide is added. This is often necessary when treating concentrates.
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Effect of pre-aeration on gold leach recovery. In the paper "Treatment of Gold Ore containing Pyrrhotite at Sub-Nagel, Limited" the authors describe investigations carried out to determine the cause of high residues at the aforesaid property and the measures taken to correct the difficulty. The following treatment was evolved:
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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.
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Four iron-sulphide-containing gold ores from the White Mountain mine in the Jilin Province, China were studied to examine the benefits of using oxidative treatment prior to conventional cyanidation to leach gold. This pre-treatment consisted of bubbling air …
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Figure 1: Gold Recovery Tests for Carbonaceous Ore Figure 2: Gold Extraction Curve for Carbonaceous Ore with Kerosene Pre-treatment Gold Recovery - Carbonaceous Ore Standard Cyanide Leach Clean Mining Reagent Clean Mining + Kerosene Pre-treatment Clean Mining + Pre-aeration and RIL Gold Recovery (%) 100.0 90.0 80.0 70.0 60.0 …
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Pre-aeration of the ore prior to the cyanidation can be beneficial to mitigate problems associated with sulphide minerals during cyanidation of gold (Kondos et al., 1995; Rajala and Deschenes, 2009). A successful pre-aeration process eliminates a significant proportion of cyanide and oxygen consumers (Rajala and Deschenes, 2009).
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These types of gold sulphidic ores may be pre-treated prior to cyanidation by means of an oxidation step, converting the sulphides into oxides or sulphates. This treatment leads to a reduction in the consumption of dissolved oxygen and of cyanide in the cyanidation step and to an improvement in the metallurgical recovery. In the current work we ...
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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.
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the gold. This work studies a method of removing problematic components in an ore that can occlude gold from leaching solution, thereby hindering gold extraction. Specifically, the method studied uses forced aeration in a slurry under high pH, ambient pressure conditions to oxidize iron-sulphide-containing gold ores taken from a mine in China.
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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 …
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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, aeration rate, agitation speed, temperature, and oxidation time.
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