cyanide consumption gold ores

The Metallurgy of Cyanide Gold Leaching – An …

 · The Metallurgy of Cyanide Gold Leaching – An Introduction. Leaching gold with a cyanide solution remains the most widely used hydrometallurgical process for the extraction of gold from ores and concentrates. Despite the difficulties and hazards of working with cyanide, no other process has yet been proven to be an economic viable alternative.

(PDF) Cyanidation of gold ores containing copper, …

Cyanidation of gold ores containing copper, silver, lead, arsenic and antimony International Journal of Mineral Processing, 2010 Fathi Habashi Download PDF Download Full PDF Package This paper A short summary of this paper 37 Full PDFs related to this ...

Cyanide Amenability Studies of Gold Ores-The Use of Design of …

Cyanide Amenability Studies of Gold Ores-The Use of Design of Experiment (DOE) R. K. Oboh 1, K. Ackah and C. Owusu1* ... may lead to higher cyanide consumption rate compared to the other pit samples. The organic carbon content was between 0.17% ...

Gold Metallurgy & Leaching in Cyanicides

 · A metallurgist points out that the principal factors in cyanide consumption and the extraction of gold from the Homestake ore include cyanide concentration, oxygen content of the pulp, hydrogen-ion concentration (pH), and temperature.

Industrial Application of Ammonia Assisted Cyanide Leaching for Copper-Gold Ores

1 Industrial Application of Ammonia Assisted Cyanide Leaching for Copper-Gold Ores Farhang Hedjazi and A. John Monhemius* Anglo Asian Mining plc, Baku, Azerbaijan ABSTRACT A description of the agitation leach plant used for treating gold-copper ores at

Modelling and simulation of gold ore leaching

Cyanide consumption is estimated by an empirical model that is a function of ore particles size distribution as well as cyanide, ... gold ores and with a non-preferential breakage assumption which is not applicable due to gold grains ductility. Because of such 18 ...

Treatment of copper-rich gold ore by cyanide leaching, …

 · BAS A D, YAZICI, E Y, DEVECI H. Treatment of copper rich gold ores by ammonia assisted cyanide leaching [C]//Proceedings of the XXVI International Mineral Processing Congress (IMPC). New Delhi, India, 2012: 356–365.

Cyanide Consumers in Gold Leaching Process

Clay minerals are troublesome in some gold ores causing high consumption of cyanide, also high viscosity slurries that are difficult to settle. These problems occur when some organic compounds are present and it is necessary a pre-treatment or identify its presence to avoid problems.

MY134378A

 · THE PRE-TREATED ORE IS THEN LEACHED BY A CONVENTIONAL CYANIDE LEACHING STEP TO RECOVER THE PRECIOUS METAL AND CYANIDE CONSUMPTION CAN BE REDUCED BY MORE THAN TWO THIRDS. Reducing cyanide consumption in gold recovery from finely ground refractory ores and concentrates

Cyanide Management by SART

Currently, the oxide gold ore is treated in a conventional CIL circuit by blending the low and high grade copper ores to minimize cyanide consumption and allow smooth operation. The sulfide ore is treated

COMPARISON OF CYANIDE AND THIOSULPHATE LEACHING FOR GOLD PRODUCTION …

According to Vaughan (2004) complex ores are ores in which the gold is readily available for leaching but the gangue mineralogy in some way interferes with cyanidation process. The gangue minerals consume cyanide and oxygen in solution or they re-adsorb gold from

WO2004042094A1

Precious metals such as gold can be extracted from a refractory ore using a conventional cyanide leaching step and with reduced cyanide consumption by pre-treating the ore prior to cyanide leaching. The refractory ore is pretreated by fine grinding and an initial ...

(PDF) The Use of Oxygen in Gold Cyanidation | Wesley …

The dissolution of sulphides results in high cyanide concentrate prior to gold recovery by a cyanide leaching process consumption with the formation of cyano complexes (e.g. of r&31. the ions Fe'' '' …

CHARACTERIZATION OF JAROSITE FORMED DURING BIOOXIDATION OF REFRACTORY GOLD ORES AND ITS EFFECT ON CYANIDE CONSUMPTION DURING GOLD …

University of Pretoria i ABSTRACT Biooxidation is an attractive process for unlocking of gold from refractory ores, but could be further improved by reducing the rather high cyanide consumption during the cyanidation of the biooxidation residues. The high cyanide

US7488370B2

Precious metals such as gold can be extracted from a refractory ore using a conventional cyanide leaching step and with reduced cyanide consumption by pre-treating the ore prior to cyanide leaching. The refractory ore is pretreated by fine grinding and an initial ...

Leaching of a polymetal gold ore and reducing cyanide …

T1 - Leaching of a polymetal gold ore and reducing cyanide consumption using cyanide-glycine solutions AU - Barani, Kianoush AU - Dehghani, Morteza AU - Azadi, M. R. AU - Karrech, Ali PY - 2021/3/15 Y1 - 2021/3/15 N2 - Many aspects of gold ores

Industrial application of ammonia-assisted cyanide …

 · The use of ammonia to reduce the consumption of cyanide during the leaching of gold from copper-bearing ores was patented in 1902 by Hunt (1902), during the first period of intense R&D activity in gold metallurgy that followed the invention of the cyanide

CA2504934C

Precious metals such as gold can be extracted from a refractory ore using a conventional cyanide leaching step and with reduced cyanide consumption by pre-treating the ore prior to cyanide leaching. The refractory ore is pretreated by fine grinding and an initial ...

Treatment of copper-rich gold ore by cyanide leaching, ammonia …

Ammoniacal cyanide leaching has been proposed for the treatment of gold ores that contain reactive copper in appreciable quantities [4,5,8,34]. Compared with the traditional cyanide leaching, ammonia cyanide system allows selective leaching of gold from copper-gold ores with remarkably reduced consumption of cyanide. It is a rather complex system intimately controlled by the reagent interactions within the system. Therefore, based on the preliminary studies [6,12], leaching tests were designed using Box-Behnken design to evaluate main and interaction effects of concentrations of NaCN, NH3 and Pb(NO3)2 on the selective extraction of gold and consumption of NaCN. Table 4 shows gold and copper extractions as well as NaCN consumption (kg/t per 1% Au) over 24 h. Figure 8 is also presented to illustrate the time-dependent leaching profile for gold …

Ultrafine Grinding

A 6.8% decrease in gold extraction occurred when the cyanide concentration was reduced to 550 ppm (gold extraction of 92.2%). This is expressed by a sharp increase of the gold content of the leach residue. The cyanide consumption was 1.2 kg/t NaCN for the

A Review on Alternative Gold Recovery Reagents to Cyanide

organic chemicals. Cyanide used in gold extraction presents the 20% of the while cyanide consumption in the world. It is also important to motivate other application areas to reduce the consumption or replace with other reagents [19]. 3. Alternative Gold

Effect of Oxidative Pretreatment and Lead Nitrate …

 · 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. Au recovery was increased from 79.4% to 89.4% in the …

Cyanide Leaching Chemistry & Gold Cyanidation

 · In this form it reacts readily with cyanide thus increasing cyanide consumption. Gold occurs in ores in many different forms and the scheme of treatment has to be worked out accordingly. Fine, free and clean gold presents no problem provided that the cyanide solution contains no …

(PDF) Industrial Application of Ammonia Assisted Cyanide …

AMMONIA ASSISTED CYANIDE LEACHING Previous WorkThe use of ammonia to reduce the consumption of cyanide during the leaching of gold from copper-bearing ores was patented in 1902 by Bertram Hunt (Hunt 1902), during the first period of intense R&D

Thiosulphate as an Alternative to Cyanide for Gold Processing

Thiosulphate is an attractive alternative reagent to cyanide for processinggold ores. It is relatively cheap and non-toxic, forms relatively stronggold and silver complexes, and readily leaches gold ores in ammoniacalsolutions, catalysed by Cu(II). It is particularly suited to carbonaceousores where the recovery of gold by cyanide is poor. However researchover the past 20 years has identified a number of issues and impedimentsthat must be understood or overcome before an overall process can bedemonstrated as practical and economic for typical oxidised gold ores.This paper reviews our current understanding of thiosulphatechemistry and mechanism of gold dissolution, and discusses the stabilityof thiosulphate and polythionates. It then reviews the results of leachingvarious gold ores that have been reported in the literature, discusses goldrecovery options, and considers environmental and toxicity issues. Someof the issues that require further research include decreasing theoxidation of thiosulphate by Cu(II) or other oxidants, increasing theextraction of gold compared to cyanide, …

The Metallurgy of Cyanide Gold Leaching – An Introduction …

 · Leaching gold with a cyanide solution remains the most widely used hydrometallurgical process for the extraction of gold from ores and concentrates. Despite the difficulties and hazards of working with cyanide, no other process has yet been proven to be an economic viable alternative.

Estimating process design gold extraction, leach …

 · Plant design parameters for gold extraction, leach residence time and cyanide consumption are generally determined from standard bench-scale bottle roll or agitation leach tests. The application of laboratory data to process design has essentially evolved from the testing of oxide or low cyanide-consuming ores. Such scale-up factors may not be appropriate for ores that deplete cyanide …

Bottle Roll Testing for Cyanidation of Gold Ores: Problems related to Standardized Procedures on Difficult-to-Process Ores

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

Influence of copper minerals on cyanide leaching of …

Experimental results show that not all the total copper in an ore affected cyanide leaching of gold, while cyaniding easily soluble copper turns out to be the decisive factor that interferes with gold cyanidation by causing decrease in gold cyanidation recovery and increase in cyanide consumption. When cyaniding easily soluble copper content ...

Minerals | Free Full-Text | Predicting Cyanide …

The consumption of cyanide during processing operations is a major economic cost in the extraction of gold from its ores, while the discharge of cyanide wastes may result in significant environmental pollution. Many factors influence the levels of consumption and discharge of cyanide, including ore mineralogy and lixiviant solution chemistry. This paper proposes a robust methodology to ...

Method for reducing cyanide consumption during …

A method for reducing consumption of cyanide and level of carbon fouling during cyanide extraction of gold and silver from their ores by treating the ore or aqueous slurry of the ore with a water-soluble sequestering agent for the base metal species for a time sufficient ...

Gold-Copper Ores

 · In treating copper–gold ores, a sufficient free cyanide concentration is typically maintained to encourage the selective adsorption of gold over copper onto carbon (other than for the processes described in the previous section, which aim to minimize the dissolution

How is Sodium Cyanide Consumed during Gold …

 · From the electrochemical reaction, it can be known that dissolving 1 gram of gold consumes 0.92 grams of sodium cyanide. 2.Cyanide Consumption in Reaction with Associated Base Metals (1) Some gold ores contain pyrite, pyrrhotite, magnetite, copper sulfide, sulfate ore, hydroxide, oxide and other associated minerals.

Reducing cyanide consumption in gold recovery from …

Reducing cyanide consumption in gold recovery from finely ground sulphide ores and concentrates United States Patent 7488370 Abstract: Precious metals such as gold can be extracted from a refractory ore using a conventional cyanide leaching step and with ...