Selective Nickel Leaching from Nickel and Cobalt Mixed …
(1) Chlorine leaching is a well-known selective nickel leaching process with high efficiency, which has been widely used for nickel cathode production. 1) However, for safe and environmentally friendly production, facilities require expensive corrosion-resistant materials for handling chlorine gas. These conditions place unfavorable restrictions on the location of …
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Challenges with elemental sulfur removal during the leaching …
Zinc sulfide ores mainly have been treated by pyrometallurgical methods to recover zinc. ... originally in a zinc-leaching residue obtained from the leaching of a sulfur-rich flotation concentrate (S: 64.7%, SiO 2: ... Separation and enrichment of valuable elements from copper residue leached by chlorine. J. Cent. South Univ., 36 (2005), pp. 38-43.
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Leaching
The results of the leaching tests are influenced by the applied physicochemical boundary conditions. The use of a standard test method that best replicates the leaching conditions in the field is still hotly debated. Apart from the tests used for concrete, there are two specific methods to assess the leachability of shotcrete [9]. Both ...
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Research on conventional leaching process and leaching …
To investigate the leaching rules and mechanism of a hard rock uranium ore, this paper conducted conventional leaching experiments based on the chemical composition and mineral occurrence status of the ore. Various factors affecting leaching were explored, and experimental data were fitted using the shrinking-core model. The results showed that uranium …
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Zinc and Lead Solvent Extraction and Electrowinning
The metals sector makes substantial use of this method. EW is a method of driving electrochemical processes in the desired direction using an applied potential. ... Zhang T (2021) High purity metal lead recovery from zinc direct leaching residue via chloride leaching and direct electrolysis. Sep Purif Technol 263:118329. Article CAS Google ...
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Kinetic Investigation and Dissolution Behavior of Cyanide …
Especially iodine, bromine and chlorine are known for their high gold dissolution rate, which is similar to aqua regia. One advantage of iodine and bromine is their high selectivity in terms of separation of precious metals from base metals. ... Materials and Methods. All leaching experiments took place in an open to atmosphere beaker (1 L) on ...
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Leaching of Zinc Ash with Hydrochloric Acid Solutions
A simpler method applies direct leaching of the zinc ash with hydrochloric acid solutions, having high ability to dissolve zinc compounds. Therefore, the aim of the present work was to find …
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Leaching and solvent extraction purification of zinc from …
The Skorpion zinc processing method demonstrated the viability of the production of zinc from zinc oxide ores, using hydrometallurgical route including the leaching, solvent extraction, and ...
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Leaching of Zinc Ash with Hydrochloric Acid Solutions
Average chlorine concentration in the zinc ash from hot-Pol. J. Environ. Stud. Vol. 27, No. 4 (2018), 1-7 ... A simpler method applies direct leaching of the zinc ash with hydrochloric acid ...
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Separation and recovery of zinc from blast furnace dust via
Blast furnace dust (BFD) is a by-product of iron-making process, a typical hazardous waste containing abundant recyclable components. In this study, a NH 4 Cl cooperative coordination leaching method was proposed for the selective separation and recovery of zinc from BFD. The thermodynamic analysis results revealed that ZnO and ZnSO 4 from …
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A Clean Production Metallurgy—Chlorine Metallurgy: A …
The common treatment methods of gold ore are leaching method, biological method, and so on. However, these methods have problems such as environmental pollution ... pollution and low efficiency. Wang et al. [15] proposed the simultaneous recovery of gold and zinc elements in the ore by chlorine roasting using difficult carbonaceous gold ore ...
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Removal of chlorine from zinc sulfate solution: a …
To remove chlorine from zinc electrolysis solutions, the electrochemical method was carried out in this research. Copper electrodes with a purity of 99.99% were employed as the anode and cathode.
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Properties and Kinetics of Selective Zinc Leaching with …
The effects of varying the liquid–solid ratio, leaching temperature, stirring speed, and leaching time on the zinc leaching efficiency were determined, and the optimum values of these parameters ...
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Leaching of Cu, Zn, and Pb from Sulfidic Tailings Under the Use …
The imbalance between raw materials of high economic importance and their supply has increased the search for new approaches to obtain valuable elements from mining tailings. In this study, the extraction of copper, zinc, and lead from sulfidic tailing in sulfate–chloride media was investigated. A 33 Box–Behnken design was applied to evaluate …
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Microwave assisted chloride leaching of zinc plant residues
Chloride leaching of two zinc plant residues, goethite sludge and zinc leach product, was shown to give selective leaching of valuable and heavy metals with the aim to recover …
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A Clean Production Metallurgy—Chlorine Metallurgy: A Review
The common treatment methods of gold ore are leaching method, biological method, and so on. However, these methods have problems such as environmental pollution and low efficiency. Wang et al. [ 15 ] proposed the simultaneous recovery of gold and zinc elements in the ore by chlorine roasting using difficult carbonaceous gold ore as raw material ...
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Deep cleaning of a metallurgical zinc leaching residue …
ing, thus reducing the cost of environmental management of ZLRs. The treatment of chlorine and spent electrolyte generated in the process was discussed. Keywords: deep cleaning; zinc leach ing residue; zinc; lead; leaching; electrowinning 1. Introduction Zinc is the fourth most common metal in use, trailing only iron, aluminum, and copper.
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The Use of Acid Leaching to Recover Metals from Tailings: A …
Mine tailings deposits are often overlooked by the industry, posing significant environmental challenges due to chemical hazards and inadequate maintenance. Nevertheless, such mineral deposits hold considerable economic potential for processing, and the adoption of innovative technologies may also address critical chemical and physical stability issues. …
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Mechanism and application of the ore with chlorination …
According to the different separation methods used in the chlorination process, chlorination metallurgy can be divided into five different types: chlorination roasting, chlorination segregation (referred to as segregation method), chlorination of molten salt medium, chlorination refining of crude metal melt and chlorination leaching (including ...
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Leaching of oxidic zinc materials with chlorine and …
Leaching of Oxidic Zinc Materials with Chlorine and Chlorine Hydrate B. K. THOMAS AND D. J. FRAY Low grade zinc ores and residues were leached in chlorine water and chlorine hydrate …
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Leaching of Cu, Zn, and Pb from Sulfidic Tailings Under …
rine leaching requires additional care in order to prevent the health risks of chlorine gas production due to the handling of concentrated hydrochloric acid [27]. In view of the above, the aim of the present work was to understand the leaching behavior of zinc, copper, and lead metals from a fresh Cu–Zn tailing and to optimize the
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Removal of chlorine from zinc sulfate solution: a review
During zinc hydrometallurgy process, the chloride ions in the materials go into the leaching solution, which have abominable effects on equipment, electrowinning, and environment. So, it is necessary to remove chloride ions from zinc sulfate solution. The present review outlines the current research of removal methods of chlorine by holistically highlighting the advantages and …
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Hydrometallurgical Zinc Plants and Processes
Outotec has a proprietary leaching method for zinc concentrate. This highly cost-effective and environmentally friendly process has been proven on an industrial scale at several zinc plants. The zinc concentrate is leached in sulfuric acid, either co- …
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Leaching of Zinc Ash with Hydrochloric Acid Solutions
A simpler method applies direct leaching of the zinc ash with hydrochloric acid solutions, having high ability to dissolve zinc compounds. ... with total 79% Zn) was depleted in zinc (64%). Chlorine content in both particle fractions was similar (0.40±0.05%). In turn, Dvořák and Jandová [9] found chemical compounds as main phases (63% ...
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Silver leaching and recovery of valuable metals from magnetic tailings
The increasing amount of lead-zinc tailings in China poses a serious risk to the environment and human health. To comprehensively use these lead-zinc tailings, the sulfur and iron are recovered from the lead-zinc tailings, and magnetic tailings are produced (Lei et al., 2017, Lei et al., 2015).As a result, many metals, including silver and other valuable metals, are …
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Stepwise extraction of zinc, indium and lead from secondary …
In this study, on the basis of the thermodynamic analysis of the wet treatment process, three wet treatment methods, namely "low acid leaching", "high acid leaching" and …
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Leaching of oxidic zinc materials with chlorine and chlorine …
Low grade zinc ores and residues were leached in chlorine water and chlorine hydrate water mixtures. It was found that the rate of leaching Adrar ore and Electric Arc Furnace dust obeyed …
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Leaching of oxidized zinc ores in various media
Low grade zinc ores and residues were leached in chlorine water and chlorine hydrate water mixtures. It was found that the rate of leaching Adrar ore and Electric Arc Furnace dust obeyed a shrinking … Expand
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Recovery of zinc resources from secondary zinc oxide via …
The results revealed that the selectivity of the ammonia leaching method for zinc immersion is superior to that of sodium hydroxide and potassium hydroxide. Furthermore, some studies have demonstrated that metal ions such as Cu (II), Fe (II), and Cd (II) combine with ammonia in the ammonia-ammonium salt system [28], [29].
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Simultaneous Removal of Fluorine and Chlorine from …
the zinc concentrate enter the flue gas in the form of compounds with low boiling points, while the rest of F and Cl enter the zinc sulfate solution, a zinc-ore acid leaching solution containing iron, fluorine, and chlorine, following the roasted zinc oxide [1]. F and Cl are accumulated in the solution, and their concentrations increase ...
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