scholarly journals Study on hydrometallurgical recovery of copper and rhenium in processing of substandard copper concentrates

2021 ◽  
Vol 251 ◽  
pp. 723-729
Author(s):  
Denis Lutskiy ◽  
Aleksander Ignatovich
Keyword(s):  
Mineral Resources ◽  
Recovery Process ◽  
Copper Recovery ◽  
Oil Refining ◽  
Hydrometallurgical Processing ◽  
Steady Growth ◽  
Sorption Recovery ◽  
Sulfide Concentrates ◽  
Ammonia Leaching ◽  
Sorption Characteristics

Over the past decade, there has been a steady growth in demand for rare metals, with rhenium being one of the most highly demanded, but  also one of the most expensive and difficult to obtain. The  high demand for rhenium is  due to its use as a key component of metallurgical alloys or as a component of catalysts used in the oil refining industry. The aggregate of facts causes profitability of processing of the rhenium-containing mineral resources, which also are the copper substandard concentrates obtained at processing of the Zhezkazgan sandstones. The study focuses on the processes of extraction of copper and sorption recovery of rhenium from solutions of ammonia leaching of copper substandard concentrates.  Model solutions similar in the elemental composition to solutions of ammonia leaching solutions of copper substandard concentrates obtained during the processing of Zhezkazgan sandstones were used as an object of the study. The paper estimates extraction characteristics of copper recovery using LIX 84-I solution in kerosene, as well as sorption characteristics of the rhenium recovery process using the Purolite PPA100 anion exchanger. Based on the obtained characteristics the possibility of hydrometallurgical processing of ammonia leaching solutions of substandard copper-sulfide concentrates, and recovery of the obtained commercial products is shown.

scholarly journals Effective Recovery Process of Copper from Waste Printed Circuit Boards Utilizing Recycling of Leachate

JOM ◽  
2020 ◽  
Author(s):  
Joona Rajahalme ◽  
Siiri Perämäki ◽  
Roshan Budhathoki ◽  
Ari Väisänen
Keyword(s):  
Hydrogen Peroxide ◽  
Sulfuric Acid ◽  
Printed Circuit Boards ◽  
Sulfuric Acid Concentration ◽  
Recovery Process ◽  
Copper Recovery ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Acid Consumption

AbstractThis study presents an optimized leaching and electrowinning process for the recovery of copper from waste printed circuit boards including studies of chemical consumption and recirculation of leachate. Optimization of leaching was performed using response surface methodology in diluted sulfuric acid and hydrogen peroxide media. Optimum leaching conditions for copper were found by using 3.6 mol L−1 sulfuric acid, 6 vol.% hydrogen peroxide, pulp density of 75 g L−1 with 186 min leaching time at 20°C resulting in complete leaching of copper followed by over 92% recovery and purity of 99.9% in the electrowinning. Study of chemical consumption showed total decomposition of hydrogen peroxide during leaching, while changes in sulfuric acid concentration were minor. During recirculation of the leachate with up to 5 cycles, copper recovery and product purity remained at high levels while acid consumption was reduced by 60%.

scholarly journals Possibilities of recovery and separation of rare earth elements

2019 ◽  
Vol 73 (1) ◽  
pp. 99
Author(s):  
Dominika Fila
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Mineral Resources ◽  
Oil Refining ◽  
Secondary Sources ◽  
Energy Technologies ◽  
Technology Products ◽  
Low Emission ◽  
Market Situation ◽  
Critical Mineral

Rare earth metals are a group of elements widely used in high technology products. They are included in the group of critical mineral resources for the EU economy. Rare earth elements are found in computers and mobile phones, as well as in low-emission energy technologies. They are also applied in chemical processes as catalysts in the oil refining. Some of them occur even in considerable quantities in the earth's crust but not very often in the concentrations justifying the profitability of their extraction. Additionally, the constantly growing demand and the current market situation cause that alternative resources of rare earth elements recovery are sought after. Therefore, the recovery and separation methods as well as recovery from the secondary sources are becoming more and more important. The following paper presents the possibilities of recovery and separation of rare earth elements from primary and secondary sources.

scholarly journals Sorption recovery of copper (II) and zinc (II) from chloride aqueous solutions

2014 ◽  
Vol 79 (8) ◽  
pp. 1037-1049 ◽  
Author(s):  
Olga Kononova ◽  
Marina Kuznetsova ◽  
Alexey Mel’nikov ◽  
Nataliya Karplyakova ◽  
Yury Kononov
Keyword(s):  
Hydrochloric Acid ◽  
Chemical Properties ◽  
Ammonia Solution ◽  
Copper Recovery ◽  
Kinetic Properties ◽  
Anion Exchangers ◽  
Zinc Recovery ◽  
Acidic Solutions ◽  
Copper And Zinc ◽  
Sorption Recovery

The present investigation is devoted to simultaneous sorption recovery of copper (II) and zinc (II) ions on some commercial anion exchangers with different physical-chemical properties. The initial concentrations of zinc and copper were 1-3 mmol L-1 and the recovery was carried out in 0.01 M and 2 M hydrochloric acid solutions. It was shown that the investigated anion exchangers possess good sorption and kinetic properties. After the recovery of copper and zinc from strong acidic solutions, their selective elution was carried out by means of 2 M hydrochloric acid solution (zinc recovery) and 2 M ammonia solution (copper recovery). In weak acidic solutions, copper and zinc were separated during sorption, as zinc sorption did not proceed in this case. The subsequent copper (II) elution was carried out by 2 M ammonia solution. The anion exchangers Purolite S985, Purolite A500 and AM-2B can be recommended for zinc and copper recovery from acidic industrial solutions and waste water.

Biogenic Hydrogen Sulfide for Cyanide Regeneration in Solutions during Cupriferous Gold Ores Processing

2017 ◽  
Vol 262 ◽  
pp. 131-134
Author(s):  
Anna A. Faiberg ◽  
Aleksandra N. Mikhailova ◽  
Vladimir E. Dementiev ◽  
Sergey S. Gudkov
Keyword(s):  
Hydrogen Sulfide ◽  
Sodium Cyanide ◽  
Gold Recovery ◽  
Copper Recovery ◽  
Thermophilic Microorganisms ◽  
Copper Cyanide ◽  
Gold Ores ◽  
Hydrometallurgical Processing ◽  
Optimal Approach ◽  
Process Solutions

An optimal approach to the problem of cupriferous gold ores hydrometallurgical processing is the recycling of process solutions after copper recovery and regeneration of cyanide bound in complexes. The study focuses on the copper-cyanide solutions processing technology using biogenic hydrogen sulfide for copper recovery in the form of сhalcocite, and cyanide regeneration. The strains of anaerobic sulfidogenic thermophilic microorganisms Desulfurella acetivorans and Desulfurella Kamchatkensis were used for producing hydrogen sulfide. The studies on copper precipitation and cyanide regeneration were conducted on copper-cyanide process solutions which were obtained during cyanidation of refractory cupriferous gold-bearing flotation concentrates from one of the deposits in the South Ural (Russia). Ten cycles of "Cyanidation-Regeneration" were carried out in total. The copper recovery was 86–96 %; the cyanide regeneration obtained 96 %. On an average 8.9 kg of sodium cyanide and 4.6 kg of copper sulfide were recovered from 1 m3 of solution. The sodium cyanide consumption decreased from 25.0 kg/t to 6.0 kg/t without reducing gold recovery during the CIL (carbon-in-leach) recycling process. The gold recovery was the same 63–68 %.

scholarly journals On the geological and economic assessment of the Lower Amur region (Russia)

2020 ◽  
Vol 192 ◽  
pp. 03013
Author(s):  
Viktor Kryukov ◽  
Irina Kradenykh
Keyword(s):  
Gold Mining ◽  
Construction Materials ◽  
Mining Industry ◽  
Mineral Resources ◽  
Economic Assessment ◽  
Resource Base ◽  
The Past ◽  
Steady Growth ◽  
Mineral Wealth

The development of regional economy is based on medium and long-term strategies (programs) for economic industrialization. These documents are of a sectoral or integrated nature. Republic of Sakha (Yakutia) and Kamchatka Territory have a scientifically substantiated strategy for the development of the mining industry. Despite its absence in Khabarovsk Territory, subsoil use in recent years has shown a steady growth in mining. The main volume of income comes from gold mining mainly in the northern and central parts of the region. Over the past 10 years, the most economically advantageous and geographically accessible minerals have been identified in the region. These include: coal, gold, platinum, tin, construction materials, groundwater. In the future, it is necessary to plan the development of copper-porphyry, alunite and polymetallic fields. The issues of increasing the resource base of liquid and strategic metals, formation of infrastructure, complexity of the use of mineral wealth and rational use of mineral resources remain problematic. A positive solution to problems is possible when developing and implementing an industry strategy. The basis for its formation is the geological and economic assessment of particular territories of the region.

scholarly journals Hydrometallurgical Processing of the Wastes of Polymetallic Ore Dressing

2020 ◽  
Author(s):  
Aleksander Bulaev
Keyword(s):  
Sulfuric Acid ◽  
Noble Metals ◽  
Ferrous Metal ◽  
Sulfuric Acid Concentration ◽  
Acid Leaching ◽  
Gold Recovery ◽  
Flotation Tailings ◽  
Hydrometallurgical Processing ◽  
Two Samples ◽  
Sulfide Concentrates

The possibility of hydrometallurgical treatment of old flotation tailings to extract base and noble metals was investigated. Two samples of old flotation tailings samples containing 0.26% and 0.36% of copper, and 0.22% and 0.23% of zinc were the subjects of this study. Agitation and percolator leaching was performed with distilled water and sulfuric acid solutions (of 0.5 to 10% H2SO4). It was shown that under certain conditions (sulfuric acid concentration) it was possible to achieve selective leaching of non-ferrous metals and obtain solutions with relatively low concentrations of iron ions, which is necessary for further effective extraction of non-ferrous metal ions from the solution. The effect of acid leaching on further gold recovery from the first sample containing 0.7 g/t of gold by cyanidation was investigated. The sample of the tailings after leaching with a 1% sulfuric acid solution was leached with 10% sulfuric acid. After that, the tailings sample and the acid leach residues were subjected to sorption cyanidation. Two-stage acid leaching with 1 and 10% sulfuric acid provided the higher gold recovery than one-stage (49 and 65%, respectively). Also it was shown that pregnant solution obtained during leaching of the second sample with 10% sulfuric acid may be used for oxidative leaching of substandard copper-zinc concentrate that allowed to 13 and 48% of copper and zinc from the concentrate during the leaching at 80∘C. Keywords: flotation tailings, leaching, substandard sulfide concentrates

RATIONAL PROCESSING OF REFRACTORY COPPER-BEARING ORES

2018 ◽  
pp. 6-18
Author(s):  
V. A. Ignatkina ◽  
V. A. Bocharov ◽  
A. R. Makavetskas ◽  
A. A. Kayumov ◽  
D. D. Aksenova ◽  
...  
Keyword(s):  
Processing Parameters ◽  
Weak Acid ◽  
Copper Recovery ◽  
Iron Sulfides ◽  
Acid Media ◽  
Copper Concentrate ◽  
Flotation Activity ◽  
Hydrometallurgical Processing ◽  
Wide Range ◽  
Rock Minerals

The paper presents the results obtained when studying material compositions of four samples of refractory copper-bearing ores from the Uzelga deposit along with technological solutions to improve their processing parameters. The refractoriness of ores is associated with a thin dissemination (up to a micron size) and close intergrowth of ore and rock minerals. Ferrous sulfides are represented by a wide range of minerals: pyrite, marcasite and their variety melnikovite, arsenic pyrite and arsenopyrite; sooty melnikovite has a higher flotation activity. The reduction of iron sulfides from 89 to 29 % is followed by a proportional increase of easy-floatable rock minerals to 45 % and clay to 9 %. These properties make these sulfides difficult to process (float) and maintain ore refractoriness. The content of copper sulfides in ore samples varies from 3,32 to 7,29 %; the relative fraction of copper sulfide in a form of tennantite in different deposit samples varies from 29 to 93 %. Copper is also present as chalcopyrite and bornite. The best flotation activity of tennantite can be seen in neutral and weak acid media in contrast with standard flotation mode for chalcopyrite and bornite with butyl xanthate in a high-alkaline calcareous medium. Free grains of copper minerals can be selectively extracted into the intermediate flotation copper concentrates when grinding maximum 60 % of the –71-μm class. The technology of flotation in a low-alkaline medium is developed for refractory copper-bearing ores with variable tennantite content using the M-TF selective sulfhydryl collector in intermediate copper flotations and copper concentrate upgrading cycle; aeration used to suppress melnikovite flotation activity makes it possible to achieve 80 % copper recovery into conditioned copper concentrate. Bornite, tennantite, chalcopyrite and sphalerite disseminated in pyrite make it rational to obtain copper-pyrite, copper-zinc-pyrite products with their yield up to 12 % for pyroand hydrometallurgical processing.

Eco-friendly copper recovery process from waste printed circuit boards using Fe3+/Fe2+ redox system

2015 ◽  
Vol 40 ◽  
pp. 136-143 ◽  
Author(s):  
Szabolcs Fogarasi ◽  
Florica Imre-Lucaci ◽  
Attila Egedy ◽  
Árpád Imre-Lucaci ◽  
Petru Ilea
Keyword(s):  
Printed Circuit Boards ◽  
Recovery Process ◽  
Redox System ◽  
Copper Recovery ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards
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