scholarly journals Autoclave treatment of cakes after pressure oxidation leaching of chalcopyrite concentrates

2020 ◽  
pp. 13-18
Author(s):  
A. V. Kritskii ◽  
M. A. Tretyak ◽  
К. A. Karimov ◽  
S. S. Naboichenko
Keyword(s):  
Precious Metals ◽  
Source Material ◽  
Metal Extraction ◽  
The Urals ◽  
Pressure Oxidation ◽  
Promising Alternative ◽  
Autoclave Treatment ◽  
Conventional Technology ◽  
Copper Refining ◽  
Chalcopyrite Concentrate

The existing technologies for copper-porphyry ores enrichment, located in deposits in the Urals of Russia, allow the production of chalcopyrite concentrates of the following composition, %: 21.5 Cu, 24.5 Fe, 26.5 S, 0.4 Pb, 17.6 SiO2, 1.8 CaO, 2–6 Au (ppm), 20– 40 Ag (ppm). A conventional technology for processing such concentrates includes autogenous smelting, matte desulfurization and blister copper refining. Pressure oxidation leaching (POX) is considered the most promising alternative technology for chalcopyrite concentrate processing. The POX of concentrates originated from Mikheevskii GOK allow the production a cake of the following chemical composition, %: 56–65 Fe2O3, 25–30 SiO2, 2.7 Ca, 0.3–1.0 Cu, 2–7 S, 0.6–0.8 Pb, 4–12 Au (ppm), 40–80 Ag (ppm); mass loss was 37–45 %. A standard method of cake cyaniding provides satisfactory indicators of precious metal extraction, but it requires a cumbersome area to be arranged for their processing and offers no solution for residue disposal. In this regard, this paper investigates the method of subsequent cake processing using autoclave treatment (AT) for iron removal. The study shows how the following parameters affect the results of this process: t = 110÷210 °C, H2SO4 = 15÷60 g/dm3, τ = 45÷ ÷120 min. A statistic description of the AT operation is developed. Recommended AT conditions (t = 110 °C, H2SO4 = 60 g/dm3, τ = 60÷100 min) allow to obtain the POX cake yield reduced to 30–35 % of the source material with the following composition, %: 28–33 Fe2O3, 47–53 SiO2, 2–5 Ca, 0.6–2.0 Cu, 0.8–1.5 Pb, 2–8 S. At the same time, the content of precious metals in the cake reaches 12–16 Au (ppm) and 80–120 Ag (ppm). Options for using AT products are proposed.

Review Lecture: Metal recycling from scrap and waste materials

1976 ◽  
Vol 351 (1665) ◽  
pp. 151-178 ◽  
Keyword(s):  
Precious Metals ◽  
Advisory Council ◽  
Metal Extraction ◽  
Waste Materials ◽  
Hydrometallurgical Processing ◽  
A Value ◽  
Ferrous Metals ◽  
Metal Recycling ◽  
Copper Refining ◽  
Non Ferrous Metals

Out of a total U. K. consumption of 2.5 million tonnes per annum (Mt/a) of non-ferrous metals with a value of about £1300 M, as much as 33% with a value of £300-400 M, is recovered from scrap. The structure of the industry which makes this important contribution to the economy is briefly outlined and the paper describes the technology by which the various non-ferrous metals are recovered in re-usable form from waste materials. Sections dealing with the following metals provide data on tonnages treated, descriptions of scrap arisings and the processes oper­ated for metal extraction and refining - copper, aluminium, lead, zinc, tin and precious metals. Reference is made to difficulties encountered and the efficiency of reclamation, such as the small amount of zinc recycled as metal. Under future developments, the possible wider use of oxygen in copper refining and hydrometallurgical processing of high value and complex scrap are discussed. Mention is made of the potential for metal recovery for domestic refuse and the rôle of the Waste Management Advisory Council is described.

scholarly journals ITO-free Perovskite Light-Emitting Electrochemical Cell

2021 ◽  
Vol 2015 (1) ◽  
pp. 012010
Author(s):  
M Baeva ◽  
D Gets ◽  
E Bodyago ◽  
A Mozharov ◽  
V Neplokh ◽  
...  
Keyword(s):  
Electrochemical Cell ◽  
Complementary Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
Electrochemical Cells ◽  
Semiconductor Technology ◽  
Promising Alternative ◽  
Light Emitting ◽  
Conventional Technology ◽  
Halide Perovskites ◽  
Important Branch

Abstract Since Complementary metal–oxide–semiconductor technology is the conventional technology for micro- and optoelectronics, integration of emerging materials, such as halide perovskites, into the process is an important branch of perovskite technologies development. In this regard ITO free device research becomes increasingly important. The Perovskite Light-Emitting electrochemical cells are a promising alternative to conventional Perovskite Light Emitting Diodes. In this work we demonstrate green (λEL = 523 nm) CsPbBr3 Perovskite Light-Emitting electrochemical cells with luminescence intensity of 50 kd/m2 integrated with Si++(111) substrate.

From the Urals to the Carpathians

2006 ◽  
Author(s):  
I.K. Latysh ◽  
Keyword(s):  
Precious Metals ◽  
The Urals ◽  
The Carpathians ◽  
Great Patriotic War ◽  
Original Presentation ◽  
The 1960S

The book contains a biography of the oldest geologist in Ukraine. His homeland is the Chernihiv region, he lived in the Urals for about 30 years, worked and studied. The author was a participant in the Great Patriotic War as a tank crewman, fought in battles from Smolensk to Vienna (Austria). Since the 1960s he’s again been living in Ukraine. His biography reflects almost the entire Soviet era. The chapters of the book are imperceptibly interconnected by the original presentation of the material. Special attention is paid to the geology and mineralogy of deposits and ore occurrences of precious metals of the Urals, as well as the Carpathians and other regions of Ukraine.

Pressure Leaching of Chalcopyrite Concentrate: Iron Removal from Leaching Residues

2020 ◽  
Vol 299 ◽  
pp. 1052-1057
Author(s):  
Aleksei Kritskii ◽  
Kirill Karimov ◽  
Stanislav Naboichenko
Keyword(s):  
Sulfuric Acid ◽  
High Temperature ◽  
Materials Processing ◽  
Pressure Leaching ◽  
Acid Media ◽  
Autoclave Treatment ◽  
Oxidative Leaching ◽  
Chalcopyrite Concentrate ◽  
Leaching Residue ◽  
By Products

Autoclave oxidative leaching is one of the most promising hydrometallurgical approaches for copper suplhide materials processing. In previous studies [2–4], the possibility of an efficient autoclave treatment of chalcopyrite concentrate was confirmed. The concentrate has the following chemical composition, %: 21.5 Cu, 0.1 Zn, 26.5 S, 24.5 Fe, 0.05 Pb, 0.04 Ni, 16.2 SiO2 [1]. At high temperature conditions (190–200 °C; 4–6 bar) in sulfuric-acid media during 100–120 min about 98% Cu was extracted. A leaching residue after POX (POX-cake) contained the following compounds, %: 55 Fe2O3, 40 SiO2, 4 MeS2/MeS. Current paper presents the results on purification of POX-cakes from iron by autoclave treatment. Futher ways for by-products (SiO2-cake and FeSO4-solution) processing are sugested.

Microbially Supported Recovery of Precious Metals and Rare Earth Elements from Urban Household Waste Incineration Slag

2015 ◽  
Vol 1130 ◽  
pp. 652-655
Author(s):  
E. Marie Muehe ◽  
Caroline Schmidt ◽  
Jing He ◽  
Thomas Helle ◽  
Andreas Kappler
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Extraction Efficiency ◽  
Precious Metals ◽  
Waste Incineration ◽  
Metal Extraction ◽  
Household Waste ◽  
Urban Household ◽  
Ph Values ◽  
Financial Pressure

The use of precious metals and Rare Earth Elements in electronic, medical, and automobile industries is drastically increasing. To meet this demand and to escape the financial pressure of the global metal market, not only mining activities but recently also the recovery of these elements from industrial and urban household waste is in the focus of research. It has been shown that the application of extracting solutions with pH values lower than 4 lead to an economically feasible recovery of industrially precious metals. It is unclear, however, whether and to which extent this abiotic extraction efficiency can potentially be increased by using microorganisms capable of dissolving more stable minerals at low pH. The goal of this project therefore is to first view urban household waste as a resource for metals and evaluate combined abiotic and biotic extraction procedures for an increase in metal extraction efficiency.

scholarly journals Characterization and process development for the selective removal of Sn, Sb, and As from anode slime obtained from electrolytic copper refining

2018 ◽  
Vol 54 (1) ◽  
pp. 81-89 ◽  
Author(s):  
S. Steinlechner
Keyword(s):  
Process Development ◽  
Precious Metals ◽  
Literature Survey ◽  
Anode Slime ◽  
Copper Refinery ◽  
Copper Refining ◽  
Leaching Solution ◽  
Leaching Experiments ◽  
Pyrometallurgical Processing ◽  
Solid Liquid

The aim of this work was to develop a process for the removal of Sn, Sb and As from anode slime out of copper refinery to disburden a subsequent pyrometallurgical processing for precious metals refinement. For this reason, a detailed literature survey was conducted, followed by a characterization to find the present compounds/alloys and their morphology. A newly developed process concept for the separate extraction of the afore mentioned three target metals was developed and verified by leaching experiments, combined with thermodynamic calculations on their behavior under varying conditions. In this context, the influence of leaching temperature, alkalinity of leaching solution, and solid-liquid ration were evaluated on the extraction yields of Sn, As, and Sb, as well as how to exploit these findings to obtain separate streams enriched in the respective metals.

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