scholarly journals Sº and jarosite behavior during recovery of values from the direct leaching residue of sphalerite using cyanide and glycine

2021 ◽  
pp. 31-31
Author(s):  
N.G. Picazo-Rodríguez ◽  
F.R. Carrillo-Pedroza ◽  
Martínez Luévanos ◽  
M.J. Soria-Aguilar ◽  
I. Almaguer-Guzmán
Keyword(s):  
Hydrothermal Treatment ◽  
Elemental Sulfur ◽  
Extraction Process ◽  
Gold Extraction ◽  
Valuable Metals ◽  
Negative Effect ◽  
Leaching Residue ◽  
Direct Leaching ◽  
Cyanide Consumption ◽  
Silver Extraction

This paper reports the effect of the components of a direct leaching residue (jarosite and elemental sulfur), on the recovery of valuable metals such as gold and silver. Leaching media such as cyanide and mixtures of cyanide with glycine were used to recover the gold and silver from the residue; however, a low recovery of these metals was obtained. The above due to the negative effect of its components which cause problems in the extraction process such as encapsulation of silver (due to jarosite) and the formation of thiocyanate and re-precipitation of silver (due to sulfur). Various treatments prior to leaching were tested, finding that when the residue is desulfurized with perchlorethylene and subjected to an oxidizing alkaline hydrothermal treatment, the gold extraction increased from 39.73 to 88% and the silver extraction of 64.76 to 94.29%. Additionally, it was determined that when cyanide is assisted by glycine, the latter decreases the cyanide consumption by inhibition of the dissolution of iron and sulfur in cyanide.

Separation of elemental sulfur from zinc concentrate direct leaching residue by vacuum distillation

2014 ◽  
Vol 138 ◽  
pp. 41-46 ◽  
Author(s):  
Hailong Li ◽  
Xianying Wu ◽  
Mingxia Wang ◽  
Jun Wang ◽  
Shaokang Wu ◽  
...  
Keyword(s):  
Vacuum Distillation ◽  
Elemental Sulfur ◽  
Leaching Residue ◽  
Direct Leaching ◽  
Zinc Concentrate

Green chemistry in mineral processing: chemical and physical methods to enhance the leaching of silver and the efficiency in cyanide consumption

2018 ◽  
Vol 90 (7) ◽  
pp. 1109-1120 ◽  
Author(s):  
Alejandro Alarcón ◽  
Carlos Segura ◽  
Carlos Gamarra ◽  
Juan Carlos F. Rodriguez-Reyes
Keyword(s):  
Green Chemistry ◽  
Mineral Processing ◽  
Metal Extraction ◽  
Complex Nature ◽  
Valuable Metals ◽  
Low Efficiency ◽  
Chemical Pretreatments ◽  
Extractive Economies ◽  
Cyanide Consumption ◽  
Silver Extraction

Abstract The leaching of valuable metals from mineral ores is the basis of several extractive economies around the world, but the strategies employed often need to rely on dangerous compounds such as cyanides. Due to the complex nature of most ores, leaching processes are slow and have a low efficiency in noble metal extraction, which is usually improved by fine-milling the mineral. In this manuscript, we consider this strategy, demonstrating that it may increase the amount of silver leaching, but at the expense of a higher consumption of cyanide, which renders the process inefficient (only 2% of consumed cyanide is employed to complex silver). The increase in the yield of the desired product without the smarter use of dangerous compounds is shown as a paradigm of the need to insert green chemistry principles in industrial processes. We further present the result of two potential strategies for greener mineral processing: the use of ultrasound to eliminate passivating layers formed during the leaching process and the use of chemical pretreatments to eliminate possible sources of passivation. These strategies can increase the amount of silver extraction and simultaneously increase the efficiency in cyanide consumption. The convenience of these pretreatments in the framework of the green chemistry principles, as well as the challenges towards their implementation at industrial scale, is discussed.

Investigations on a Novel Process to Recycle Valuable Metals from Spent Al2O3-Based Catalyst

2013 ◽  
Vol 634-638 ◽  
pp. 3222-3226
Author(s):  
Yan Hai Shao ◽  
Ming Ming Li ◽  
Xiong Tong
Keyword(s):  
Sodium Aluminate ◽  
Leach Liquor ◽  
Spent Catalyst ◽  
Water Leaching ◽  
Calcination Process ◽  
Aluminate Solution ◽  
X Ray ◽  
Sodium Aluminate Solution ◽  
Valuable Metals ◽  
Leaching Residue

Based on X-ray phase analysis and exploratory experiments, a novel process was proposed to recycle multiple valuable metals like Al, V, Mo, Ni and Co from spent Al2O3-based catalyst. The spent catalyst was roasted by adding sodium carbonate with certain mol ratio, after water leaching, Al, V and Mo could be extracted into leach liquor, whereas Ni and Co were enriched in the leaching residue. V and Mo were precipitated in step from leach liquor by adding CaO and BaAl2O4, respectively. After removal of V and Mo, Al(OH)3 was prepared from sodium aluminate solution with carbonation decomposition process, and the purity of Al2O3 is 99.98%. With sodium bicarbonate leaching-purification-precipitation-calcination process, V2O5 could be prepared from V-bearing residue. Ni and Co were leached from water leaching residue with sulfuric acid. Recoveries of Al, V, Mo, Ni and Co from spent catalyst are 87.0%, 88.7%, 92.1%, 97.8% and 98.6%, respectively.

Cyanide Recovery from Gold Extraction Process Waste Effluents by Ion Exchange I. Equilibrium and Kinetics

2006 ◽  
Vol 24 (1) ◽  
pp. 99-117 ◽  
Author(s):  
M. Torre ◽  
D. Bachiller ◽  
M. Rendueles ◽  
C. O. Menéndez ◽  
M. Díaz
Keyword(s):  
Ion Exchange ◽  
Extraction Process ◽  
Gold Extraction ◽  
Process Waste ◽  
Equilibrium And Kinetics ◽  
Waste Effluents

scholarly journals Peningkatan pengetahuan pada masyarakat tentang konstruksi sumur gali dan bak penampungan limbah serta jarak yang aman terhadap sumber pencemar

2020 ◽  
Vol 1 (2) ◽  
pp. 122
Author(s):  
Darmiati Darmiati ◽  
Nilawati Nilawati
Keyword(s):  
Cognitive Abilities ◽  
Extraction Process ◽  
Fine Motor ◽  
Waste Collection ◽  
Gold Extraction ◽  
Cross Sectional ◽  
Question Item ◽  
Dug Wells ◽  
Cross Sectional Design ◽  
Dug Well

Background: The use of mercury material has developed very broadly, and one of them is in the gold mining process which is carried out in the gold extraction process. The activity is carried out in the yard of the house and adjacent to the dug well, this can cause pollution in the soil and dug well water. Problems that arise due to exposure to Mercury are gastrointestinal disorders, kidney damage, nerve damage, disability in the fetus, while in children will reduce cognitive abilities and thinking, memory, attention, language mastery, fine motor skills and visual.Objectives: The purpose of this community service is to increase community knowledge about the construction of dug wells and waste collection tanks as well as a safe distance to pollutants in the traditional gold mining.Method:  The study used a cross-sectional design, involving subjects in 30 community groups. Data collection using a questionnaire and conducted interviews. Analysis of research data is only done univariately.Results: The results of the evaluation of the activity revealed that there was an increase in public knowledge of the conditions for the construction of dug wells, waste collection basins and diseases caused by mercury exposure directly or indirectly on the human body (able to answer questions correctly more than 20% on each question item).Conclusion: Most people begin to understand that the danger of mercury does not only occur in the skin, but can affect the entire organ system and permanent nervous system damage.

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. 

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