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  • (PDF) Cyanide Leaching of Copper-Gold-Silver Ores

    Jul 11, 2013· [Show full abstract] thesis presents a kinetic and electrochemical study of the leaching of gold in cyanide solutions, and emphasis is placed on rationalising the conflicting results which have

  • Optimisation of the Leaching Parameters of a Gold Ore in

    Mar 01, 2018· The leaching reaction of gold in a solution of sod ium cyanide (NaCN) can be represented as follows: (1 ) When performing the leaching p rocess, the c yanide solution must penetrate through the ore.

  • Cyanidation of a copper-gold ore ScienceDirect

    Abstract. A free milling gold ore, which contains 0.4% copper as chalcopyrite, was treated with cyanide. In the pre-leaching, the kinetics of oxidation of soluble sulphides are not an accurate indication for the length of the treatment. Efficient gold leaching is achieved only under specific conditions using oxygen, lead nitrate and a high

  • (PDF) Chemical behaviour of cyanide in the extraction of

    [Show full abstract] Cyanide leaching of the copper-rich ore and the pyritic ore resulted in low gold extractions of only ~6.7% and 21.5%, respectively, indicating that they are refractory in

  • (PDF) Treatment of a Copper-Rich Gold Ore by Ammonia

    Jan 01, 2012· [Show full abstract] cyanide leaching of a copper sulphide bearing gold ore. Direct cyanide leaching of the ore with air resulted in a low extraction of gold

  • Alternative Lixiviants to Cyanide for Leaching Gold Ores

    Jan 01, 2016· A prefeasibility test on hypochlorite-leaching McDonald Gold Mine oxide ore in Montana gave 68% gold recovery compared with 73% obtained with cyanide (McNulty, 2001). Under the conditions used in their bottle-roll test work (pH 6.5, Eh 1.14 V (vs. SHE)), 33% solids (for 96-h leaching time) reagent consumption was 5.55 kg/t NaOCl and 3.25 kg/t

  • (PDF) Cyanidation of a pyrrhotite-bearing gold ore

    Effect of lead nitrate addition on the leaching of a pyrrhotite-bearing gold ore (Cyanidation: pH 11.2, 380ppm NaCN, 8ppm O 2,32h) Figure 5 illustrates the reaction of cyanide with chalcopyrite

  • Optimizing and evaluating the operational factors

    This research was carried out on Aghdareh gold ore. The Aghdareh mine and gold processing plant is located 32 km from Takab city in the western Azerbaijan province, Iran, at 46°58′30′′N and 36°39′29′′E. The grade of gold ore is 3 ppm. Also, cyanide leaching is used to process gold in the Aghdareh mine . The main problem in

  • Cyanidation of a copper-gold ore ScienceDirect

    Aug 01, 1997· The increase in cyanide content promotes the dissolution of gold during the first 24 h of leaching, but the optimum leaching kinetics are at an intermediate cyanide concentration, in this case 710 mg/L. Work indicated that the gold dissolution rate is accelerated in oxygen-enriched slurries in presence of chalcopyrite Effect of the

  • Improvements in gold ore cyanidation by pre-oxidation with

    The ore feeding the leaching circuit averages 1.70 g Au/t, with about 2.5% of pyrrhotite (FeS) as the main sulphide constituent. The addition of 60 L/h of concentrated hydrogen peroxide, H 2 O 2,50% w/w (density = 1.19 g/mL) for pre-oxidation of a slurry of 60% solids at a rate of 150 t/h (dry ore) resulted in a marked increase in dissolved

  • Bottle Roll Testing for Cyanidation of Gold Ores: Problems

    initial leach-solution. Keywords: Gold, Cyanide, Leaching, Bottle Roll Test, Preg-robbing, Cyanicide 1. Introduction Cyanide leaching of gold is a very common methodology for evaluation of low grade gold ores. Despite risks associated with cyanide, the method proved to be highly effective provided that necessary precautions are taken.

  • Improvements in gold ore cyanidation by pre-oxidation with

    The ore feeding the leaching circuit averages 1.70 g Au/t, with about 2.5% of pyrrhotite (FeS) as the main sulphide constituent. The addition of 60 L/h of concentrated hydrogen peroxide, H 2 O 2,50% w/w (density = 1.19 g/mL) for pre-oxidation of a slurry of 60% solids at a rate of 150 t/h (dry ore) resulted in a marked increase in dissolved

  • The cyanide heap leaching behavior of cupriferous gold

    Abstract. To develop a fundamental understanding of cyanide heap leaching of low-grade gold ores, with significant copper mineralization, two sets of column leach tests were operated under two different leaching solutions. In one set, four 1.5 m tall column tests were leached with sodium cyanide solution.

  • Leaching gold ore with cyanide,gold leaching technology

    Cyanide leaching gold ore . There are four points to pay attention to when leaching gold ore with cyanide: slurry concentration, temperature, cyanide and oxygen concentration, protective alkali, etc. The specific content is as follows: 1.Pulp concentration .

  • US4559209A Leaching refractory gold ores Google Patents

    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.

  • Leaching Pyrite Gold Ore without Cyanide

    Table of ContentsThiourea Leaching of GoldNON Cyanide Gold Leaching TestsThiocyanate LeachingThiourea LeachingComparison of Cyanide Thiocyanate and Thiourea Systems Alternative reagents for gold leaching include thiocyanate (SCN-) and thiourea (SC(NH2)2). They are considered less toxic and more environmentally acceptable when compared to cyanide. One of the important

  • Gold cyanidation Wikipedia

    Gold cyanidation (also known as the cyanide process or the MacArthur-Forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex.It is the most commonly used leaching process for gold extraction.. Production of reagents for mineral processing to recover gold, copper, zinc and silver represents

  • Cyanide Use in Gold Mining Earthworks

    A sodium cyanide solution is commonly used to leach gold from ore. There are two types of leaching: Heap leaching: In the open, cyanide solution is sprayed over huge heaps of crushed ore spread atop giant collection pads. The cyanide dissolves the gold from the ore

  • Experimental Research on Cyanidation Leaching of a Gold Ore

    The gold ore is oxidized ores, and it is not suitable for flotation separation. The cyanide leaching is used for the recovery of gold. Experimental studies of cyanidation leaching for a oxidized gold ore were carried out. The factors that influence leaching such as grinding size, sodium cyanide quantity, pulp density, extraction time and segmentation leaching were conducted.

  • Ammoniacal thiosulphate leaching of gold ore

    ABSTRACT Ammoniacal thiosulphate leaching of gold finds a better substitute as it is non-toxic and environmentally safe as compared to the toxic cyanide system for gold extraction. In the present study, an attempt is made to assess the feasibility of ammoniacal thiosulphate leaching of gold ore

  • Recovery of iron from cyanide tailings with reduction

    Cyanide tailing is a kind of solid waste produced in the process of gold extraction from gold ore. In this paper, recovery of iron from cyanide tailings was studied with reduction roasting-water leaching process followed by magnetic separation. After analysis of chemical composition and crystalline

  • Heap Leaching of Gold and Silver Ores ScienceDirect

    Jan 01, 2016· 2.5. Solution Application Rate, Cyanide Strength, and Leach Time. The timing of gold recovery from ore in a heap leach is a function of five factors: • The rate of gold dissolution. Coarse gold particles dissolve very slowly, and may not fully dissolve for several months in a heap leach environment. •

  • Electrochemical influence of quartz on cyanide leaching of

    Abstract. Quartz is a common gangue mineral in the gold ore. The electrochemical behavior of gold electrodes was investigated in a quartz system with different particle sizes using cyanide leaching.

  • The Metallurgy of Cyanide Gold Leaching An Introduction

    Oct 20, 2014· Liberation: Cyanide leaching will only be effective if the cyanide can come in contact with the gold particle. For this to happen, the ore should either be sufficiently porous for cyanide to reach the gold, or more usually the ore is crushed and ground to a size at which the surface of the gold is exposed i.e. the gold is liberated.