alkaline sulfide pretreatment

(PDF) 24-Alkaline sulphide pretreatment JOM - ResearchGate

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 ...

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Pretreatment Process on Refractory Gold Ores with As

Alkaline leaching pretreatment is a chemical pretreatment process which can oxidize and dispose of components of the ore through adding chemical reagents. Meng Yuqun, Wu Minjie, etc . have researched to strengthen the alkaline leaching pretreatment on …

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Optimization of Sulfide/Sulfite Pretreatment of ...

Potential of sodium sulfide and sodium sulfite, in the presence of sodium hydroxide was investigated to pretreat the corncob (CC), bagasse (BG), water hyacinth and rice husk (RH) for maximum digestibility.

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Alkaline sulfide pretreatment of an antimonial refractory ...

Alkaline sulfide pretreatment was shown to allow the decomposition of the antimonial sulfide minerals (up to 98% Sb removal) and to remarkably improve the amenability of gold (e.g., from <49% up to 83%) and silver (e.g., from <18% up to 90%) to subsequent cyanide leaching.

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ECONOMICS OF REFRACTORY GOLD ORE PROCESSES

sulfide sulfur total ore per day by all three pretreatment methods after flotation to produce 200 tonnes of concentrate. Operating costs then were estimated for each size and type process.

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refractory ore gold and pretreatment 2012 - …

Pretreatment with Ozone for Gold and Silver Recovery from ... · PDF . Two refractory ore minerals from Mexican sites were submitted to ozone pretreatment in order to break the pyritic matrix and to increase gold and silver recoveries.

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Comparison of enzymatic hydrolysis of bamboo using …

Full Article. Comparison of Enzymatic Hydrolysis of Bamboo Using Steam Explosion and Acid Sulfite, Alkali, and Alkaline Sulfite Pretreatments. Shubaichuan Qin, a Yongmiao Wang, a Yang Xing, a Pengxiang Zhao, a,b Lingxi Bu, b Dafeng Sun, c and Jianxin Jiang a,*

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antimony ore leaching australia - xclusivedirectory.co.za

on alkaline sulfide leaching have been employed industri trated antimony ores or from the crude antimony issued from theAu Sb rich ores and waste from. Contact US Improved gold and silver extraction from a refractory antimony ore by. Oct 13,2010The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching.The ore assayed 20g/t Au. Contact US ...

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A review on alkaline pretreatment technology for ...

Alkaline pretreatment can play an important role in the biorefinery of lignocellulosic biomass because alkaline treatments can be applied not only for pretreatment but also as a method for fractionation of lignocellulosic biomass. Fractionation of lignocellulosic biomass into lignin, carbohydrates, and other components can be the first step toward realization of biorefinery. Alkaline reagents ...

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Gold Sulphide Ore Oxidation by Alkaline Pressure

The U.S. Bureau of Mines developed an alkaline oxidative pretreatment to increase the recovery of gold from refractory sulfide ores containing arsenopyrite (FeAsS) and/or pyrite (FeS2).

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Basic theory and optimization of gold containing antimony ...

alkaline leaching by sodium sulfide. Its essential procedure includes antimony dissolved into leach Its essential procedure includes antimony dissolved into leach solution, and the antimony metal of 96-99% purity is produced by electrowinning from

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Pretreatment of refractory ores prior to gold leaching

Pretreatment Using Alkaline Sulfide Leaching and, technologies for pretreatment of a refractory gold concentrate prior to CIL gold, species catalyzed pressure leaching to refractory gold concentrates .

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Alkaline Sulfide Recovery of Gold | Sulfide | Gold

Then, the gold can be leached via alkaline sulfide lixiviation whereby the sulfur containing the gold is dissolved in an alkaline solution. To better illustrate this, Figure 1 [11] shows the equilibrium sulfur system while Figure 2 [12] shows the meta stable species sulfur system. In reality, the species shown in Figure 2. dominate as the alkaline sulfide system is slow to reach equilibrium .

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Alkaline leaching pretreatment and cyanidation of ...

Unlike arsenic and zinc ions which are stable in the alkaline media, the extracted iron during alkaline pretreatment precipitates as solid iron oxides such as goethite and haematite, so samples were treated with acid before the analysis of iron concentration. This was achieved by treating the feed and residues in hot 3M HCl for 15 min in order to dissolve iron oxides. The portion of iron that ...

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Pyrite from Zarshuran Carlin-type gold deposit ...

Fig. 14 points out that alkaline pretreatment can substantially improve the extraction of gold. It was found that about 66, 89 and 95% of gold can be extracted after the application of 0.25, 0.5 and 1 M-NaOH pretreatment respectively. The observed increase in gold extraction could be attributed to the liberation of gold from pyrite lattice.

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Pretreatment Using Alkaline Sulfide Leaching and Nitrogen ...

pretreatment using alkaline sulfide leaching and nitrogen species catalyzed pressure oxidation on a refractory gold concentrate corby g. anderson, phd

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24-Alkaline sulphide pretreatment JOM | ibrahim alp ...

24-Alkaline sulphide pretreatment JOM. 4 Pages. 24-Alkaline sulphide pretreatment JOM. Author. Ibrahim Alp. Download with Google Download with Facebook or download with email. 24-Alkaline sulphide pretreatment JOM. Download. 24-Alkaline sulphide pretreatment JOM. Author. Ibrahim Alp ...

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US3841962A - Hydrogen sulfide pretreatment of ...

in an alkaline pulping process in which lignocellulosic material is pre-treated with hydrogen sulfide, in which the pre-treated material is digested under heat and pressure in an alkaline digesting liquor comprising a sodium based digesting agent to form the pulp, in which the digested pulp is separated from the digesting liquor after digestion, and in which the digesting liquor is processed ...

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Comparison of Enzymatic Hydrolysis of Bamboo Using Steam ...

The alkaline sulfite pretreatment causes both alkalization and sulfonation. The goal of this paper was to evaluate the impact of pretreatment methods of acid sulfite (AS), alkali (AL), and alkaline sulfite (ALS) on bamboo that was first pretreated through low-pressure SE solubilisation. This paper reports the effect of the pretreatments on enzymatic hydrolysis using a mixture of commercial ...

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Optimization of Sulfide/Sulfite Pretreatment of ...

3.1. Effect of Sodium Sulfide and Sulfite on the Biomass Weight Loss (Lignin and Hemicellulose Removal) The amount of cellulosic residue after pretreatment was found to be different for different catalysts at varying conditions (Figure 2).

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Alkaline sulfide pretreatment of an antimonial refractory ...

Abstract This paper presents the alkaline sulfide pretreatment of an antimonial refractory gold and silver ore. In the ore, gold occurs mainly as gold-silver alloys and as associated with quartz and framboidal pyrite grains, and, to a small extent, as the inclusions within antimonial sulfides.

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BIOMASS PRETREATMENT AND FRACTIONATION - Aalto

Process of H 2S – Kraft • Hydrogen sulfide pre-treatment was awarded a patent by Day and Hoos in 1954: 20-150ºC, 2-15 bar, no water or alkali addition.

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Analysis of Cyanide (Total, Weak Acid Dissociable, and ...

The interference of nitrate and nitrite is eliminated by pretreatment with sulfamic acid. See reference methods for detailed guidance. ii. ... forming volatile carbonyl sulfide, which is converted to sulfide upon absorption in an alkaline liquid. For manual total cyanide distillation analysis use the BC MOE HCl-HH method (Ref. 13) to mitigate thiocyanate interference. To mitigate thiocyanate ...

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Enhancing Kraft Pulping Through Unconventional, Higher ...

liquor pretreatment pulping was obtained versus the use of a sodium sulfide solution [46]. It is suggested that a synergistic effect takes place between the sulfide and the alkali. But

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Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite Ores

Alkaline pressure oxidation is not new; it was first proposed by Sill (13) in the late 1950's for treating arsenic sulfide ores and was used commercially for treating a

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