scholarly journals Experimental study on thiosulfate leaching of gold from a high copper gold concentrate

2021 ◽  
Vol 271 ◽  
pp. 04001
Author(s):  
Chen Yanbo ◽  
Qin Guanglin ◽  
Li Guangsheng ◽  
Zhu Xingfu ◽  
Yu Congquan ◽  
...  
Keyword(s):  
Environmental Problems ◽  
Sodium Cyanide ◽  
Cyanide Leaching ◽  
Gold Leaching ◽  
Leaching Process ◽  
High Copper ◽  
Copper Gold ◽  
Cyanide Consumption ◽  
The Cost ◽  
Thiosulfate Leaching

The conventional cyanide leaching process is used to extract gold from a high copper gold concentrate. Because the copper associated minerals consume sodium cyanide in large quantities, the cost of the reagents is high and the economic benefit is not ideal. At the same time, a large number of cyanide tail slag are produced, which brings a series of environmental problems. In order to solve the environmental problems caused by excessive sodium cyanide consumption and cyanogen slag, the feasibility of leaching gold by thiosulfate in copper ammonia system was studied. The gold leaching rate of thiosulfate was increased to more than 90% by using the direct thiosulfate leaching process and pretreatment thiosulfate leaching process, which was close to the gold leaching index of sodium cyanide at the production site.

Recovering Gold from a Gold-Bearing Pyrite by Flotation and Chemical Process

2012 ◽  
Vol 610-613 ◽  
pp. 81-85
Author(s):  
Qing Li ◽  
Bao Liang Ge ◽  
Jie Liu ◽  
Chao Zhu
Keyword(s):  
Chemical Process ◽  
Adsorption Rate ◽  
Leaching Rate ◽  
Cyanide Leaching ◽  
Gold Leaching ◽  
Flotation Concentrate ◽  
Leaching Process ◽  
Roasting Process ◽  
Gold Bearing

The ore assays 2.5g/t Au, 23.4% S and 56.6% Fe. This research enriched the gold by flotation, and recovered it by a chemical process. The obtained flotation concentrate contains 66.35%g/t gold and 37.06% S with recovery 96.14% and 96.42% respectively. A roasting process was conducted at 900-1000°C for 5.5hrs, followed by cyanide leaching of the residue. The gold leaching rate reaches 87.4% with an adsorption rate of 97.6%. Furthermore, the regrinding of the concentrate to 95% -0.18μm was conducted, and followed by cyanide leaching at pH11.5 for 12hrs. The results show the amount leached gold reaches 92.5% with an adsorption rate of 99.21%, which increases by 1.61% and 5.1% in comparison with the roasting-leaching process.

Biooxidation Pretreatment Cyanide Leaching of a Flotation Gold Concentrate

2012 ◽  
Vol 581-582 ◽  
pp. 1106-1109
Author(s):  
Chao Zhu ◽  
Bao Liang Ge ◽  
Zhao Yi Lu ◽  
Wen Zhu
Keyword(s):  
Leaching Test ◽  
Leaching Rate ◽  
Cyanide Leaching ◽  
Gold Leaching ◽  
Flotation Concentrate ◽  
Gold Ore ◽  
Leaching Process ◽  
Direct Leaching

This study reached a gold ore which contain 3.83g/t gold, to investigate the available gold recover methods, direct cyanide leaching test and “biooxidation-cyanide” leaching process were utilized after enrich gold by flotation. When regrinding the flotation concentrate to 95% -325mm, the leaching rate of “biooxidation-cyanide” leaching reached 94.47%, compare with direct leaching, the leaching rate increased almost 67%. Obviously bacterium oxidation is a useful pretreatment for gold leaching.

scholarly journals Integrated Eco-sustainable System for Alluvial Gold Leaching-Recovery

2021 ◽  
Author(s):  
Ulises Quiroz Aguinaga ◽  
Angélica María Baena-Moncada ◽  
Adolfo La Rosa-Toro
Keyword(s):  
Integrated System ◽  
Cyanide Leaching ◽  
Gold Leaching ◽  
Leaching Process ◽  
Alluvial Gold ◽  
Leachate Solution ◽  
Leaching Solution ◽  
Rotary Drum ◽  
Sustainable System

Abstract An Integrated system for alluvial gold leaching-recovery was design to leach gold from alluvial ore as alternative to mercury and cyanide leaching. NaClO is obtained by NaCl 1 % in-situ electrolysis at pH 2 and used as leachate solution. Gold leaching optimization is achieved using a rotary drum reactor fed with the leaching solution, the process takes 6 hours and 95 % of gold recovery is obtained, the remnant gold from the alluvial ore is treated in an stationary reactor with NaClO 200 ppm at pH 2; reaching 99.6 % recovery of the total alluvial gold. This leaching-recovery alluvial system has the potential to replaced mercury and cyanide leaching process.

Anaerobic thiosulfate leaching: Development of in situ gold leaching systems

2008 ◽  
Vol 21 (6) ◽  
pp. 424-433 ◽  
Author(s):  
J.A. Heath ◽  
M.I. Jeffrey ◽  
H.G. Zhang ◽  
J.A. Rumball
Keyword(s):  
Gold Leaching ◽  
Thiosulfate Leaching

Freeze-Thaw Resistance of Concrete Modified by Rice Hull Ash and Gangue

2014 ◽  
Vol 488-489 ◽  
pp. 700-703
Author(s):  
Jing Yun Han ◽  
Liang Liang Zhang ◽  
Hai Yang Zhang
Keyword(s):  
Compressive Strength ◽  
Research Work ◽  
Environmental Problems ◽  
Rice Hull ◽  
Rice Hull Ash ◽  
Freeze Thaw ◽  
Concrete Production ◽  
The Cost ◽  
Control Samples

Currently, most rice hull is piled up or burned naturally, resulting in many environmental problems. It is a potentially good way to incinerate specially rice hull into the ash that is used as concrete admixture. The research work was done and results indicate that the compressive strength of the concrete with addition of 1%, 2% and 3% of rice hull ash increased by 6.8%16.7% and 15.1% respectively compared with control samples. And the compound addition of rice hull ash and gangue not only improved the mechanical and anti-freeze-thaw properties of concrete, but also decreased the cost of concrete production.

scholarly journals Analysis of the current state of technologies in the field of recycling technogenic gold-containing raw materials

2021 ◽  
Vol 25 (1) ◽  
pp. 97-107
Author(s):  
A. О. Vasilkova ◽  
N. V. Vasilkov ◽  
О. D. Khmelnitskaya ◽  
G. I. Voyloshnikov
Keyword(s):  
Noble Metals ◽  
Raw Materials ◽  
Cost Effective ◽  
Sodium Cyanide ◽  
Future Research ◽  
Gold Extraction ◽  
Current State ◽  
Mill Tailings ◽  
Cyanide Consumption ◽  
Technogenic Raw Materials

 In this article, we review existing approaches to recycling technogenic raw materials (ore dumps, metallurgical production slag, mill tailings of ore-dressing plants, etc.), containing non-ferrous and noble metals, which are accumulated in almost non-ferrous metallurgy industries. An analysis of existing technologies for processing technogenic raw materials (pyrite cinders and flotation tailings of concentration plants), which include enrichment, pyro- and hydrometallurgical and combined ways of extracting valuable components, was conducted on the basis of a review of published sources. It was shown that enrichment (screening, desliming in a hydrocyclone, enrichment using a concentration table, magneticliquid separation, flotation), pyrometallurgical and combined ways for extracting noble metals from this type of raw materials are unprofitable. The most satisfactory results were obtained using hydrometallurgical methods to extract valuable components from technogenic raw materials. Various solvents, such as sodium cyanide, thiocarbamide, sodium thiosulphate and sodium sulphite were tested as leaching agents. Cyanation proved to be the most effective way to extract noble metals from technogenic raw materials; however, this process is characterised by a high consumption of sodium cyanide. Therefore, it is of importance to discover an approach to extracting valuable components from such problematic products in order to make their processing more cost-effective by reducing cyanide consumption while maintaining gold extraction. According to the obtained results, gold-containing raw materials are promising in terms of extraction of nonferrous and noble metals using hydrometallurgical technologies. Future research should identify rational methods for processing technogenic gold-containing raw materials in order to make the technology more profitable for extracting valuable components. 

scholarly journals Analysis and Prediction of the Thiourea Gold Leaching Process Using Grey Relational Analysis and Artificial Neural Networks

Minerals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 811
Author(s):  
Rui Xu ◽  
Xiaolong Nan ◽  
Feiyu Meng ◽  
Qian Li ◽  
Xuling Chen ◽  
...  
Keyword(s):  
Grey Relational Analysis ◽  
Iron Concentration ◽  
Gold Recovery ◽  
Ann Model ◽  
Gold Leaching ◽  
Relational Analysis ◽  
Leaching Process ◽  
Influencing Parameters ◽  
Artificial Neural ◽  
Grey Relational

The thiourea (TU) leaching of gold from refractory ores can be considered an alternative to cyanidation. However, the high reagent consumption causes an increase in cost, which seriously limits its use. In order to effectively reduce the TU consumption, it is necessary to analyze the influencing parameters of gold recovery and TU consumption and apply them to the prediction of the TU leaching process. This paper investigated six potential influencing parameters and used grey relational analysis (GRA) to analyze the relational degree between each parameter and gold recovery and TU consumption. Then, the artificial neural network (ANN) model was established to simultaneously predict the gold recovery and TU consumption in the TU gold leaching process. The results of the GRA indicated that the leaching time, initial pH, temperature, TU dosage, stirring speed, and ferric iron concentration were all well related to the gold recovery and TU consumption. Therefore, the incorporation of these parameters can significantly improve the ANN model validation. The predictive results noted that the prediction accuracy of gold recovery varied from 94.46% to 98.06%, and the TU consumption varied from 95.15% to 99.20%. Thus, the predicted values corresponded closely to the experimental results, which suggested that the ANN model can accurately reflect the relationship between the operational conditions and the gold recovery and TU consumption. This prediction method can be used as an auxiliary decision-making tool in the TU gold leaching process, and it has broad engineering application prospects in engineering.

Study on the Gold Leaching Process by Potassium Ferricyanide

2015 ◽  
Vol 814 ◽  
pp. 273-277
Author(s):  
Ping Tang ◽  
Jing Liu ◽  
Min Wei Song ◽  
Hai Ping Yu ◽  
Xu Zhang
Keyword(s):  
Room Temperature ◽  
Potassium Ferricyanide ◽  
Process Conditions ◽  
Leaching Rate ◽  
Gold Leaching ◽  
Solid Ratio ◽  
Leaching Process ◽  
Refractory Gold ◽  
Object Of Study ◽  
High Arsenic

The traditional gold leaching method is cyanidation, which carries serious security and environmental problems. More and more attention is paid to the research on non-cyanide process. A high-arsenic-and-sulphur refractory gold concentrate in Sichuan was taken as the object of study. After the roasting-oxidation pretreatment of the sample, potassium ferricyanide was adopted to carry on the process experiment on gold-leaching. The leaching results as well as correlative process conditions were both investigated. The results showed that good leaching effects could be achieved by potassium ferricyanide. When the amount of potassium ferricyanide was 60g/L, the concentration of NaOH 0.2mol/L, the liquid-solid ratio 6:1 and the leaching process at room temperature lasted for 20h, the gold leaching rate reached 88.1%. If the leaching aid CaO2 is added simultaneously, it can contribute to the gold leaching. When the amount of CaO2 was 3g/L, the gold leaching rate increased to more than 94%, the amount of potassium ferricyanide decreased to 50g/L and the leaching time reduced to 14h.

Sandioss, an alternative reactive to NaCN for the Au leaching process by agitation for an oxide type mineral

2018 ◽  
Vol 2 (1) ◽  
pp. 1 ◽  
Author(s):  
Manlio Heras Romero ◽  
Nilton Quispe Ciudad ◽  
Juan Vega Gonzales
Keyword(s):  
Atomic Absorption ◽  
Sodium Cyanide ◽  
Variance Analysis ◽  
Gold Content ◽  
Leaching Tests ◽  
Gold Extraction ◽  
Fire Assay ◽  
Leaching Process ◽  
Mineral Type

The influence of the Sandioss reagent was studied as an alternative for the gold’s leaching by agitation of a mineral-type oxide. The evaluated variables were: the hydrogen potential (pH) with levels 7, 9 and 11, the concentration of Sandioss leach at 250 ppm, 500 ppm and 750 ppm, and the leaching time at 12, 24 and 48 hours. For each concentration of the leaching agent, a test was conducted in parallel with sodium cyanide at a pH = 11 to prevent the volatilization of cyanide. The solutions taken were analyzed by atomic absorption to determine the gold content in solution and tails were analyzed by fire assay. From the result of the leaching tests it can be concluded that for a better gold extraction with the Sandioss leaching, it is obtained at a concentration of 750 ppm of Sandioss, pH of 11 and time of 48 hours, obtained 79.15% extraction. Finally, the variance analysis at a level of 95% confidence shows that the variables studied significantly influence the extraction of gold and is presented as an alternative to the use of NaCN.

An innovative thiourea gold leaching process

1998 ◽  
Vol 48 (1) ◽  
pp. 113-124 ◽  
Author(s):  
S Ubaldini ◽  
P Fornari ◽  
R Massidda ◽  
C Abbruzzese
Keyword(s):  
Gold Leaching ◽  
Leaching Process
Sign in / Sign up

Export Citation Format

Share Document