The recovery of zinc (Zn) and lead (Pb) from a citric leach solution of a non-sulfide type ore flotation tailing was examined utilizing sulfuric acid precipitation followed by solvent extraction using di(2-ethylhexyl) phosphoric acid (D2EHPA) as the extractant. Following lead precipitation (98.9%) with sulfuric acid, the pregnant leach solution was …

Dissolution of metals using acidic or alkaline lixiviants and then separating and purifying metals from leach liquors followed by the precipitation of metals as the final product by ion exchange (IX), SX, chemical precipitation, and EW process.

The oxalic acid reduction leaching mechanism of tin was also discussed. Based on the reduction leaching behaviors of tin from ZLR, the possible Sn leaching enhancement via oxalic acid addition in the existing industrial zinc-leaching process was proposed in this work.

Abstract This paper presents the hydrometallurgical methods used for the recovery of concentrate and metallic lead from zinc plant residue (ZPR). The ZPR mainly consisting of 9.5% Pb and 7.5% Zn was initially leached by sulfuric acid under the following conditions: leaching temperature 90 °C, leaching time 90 min., sulfuric acid …

Acid leaching of the zinc ash was accompanied by exothermic effects. Precipitation purification of the leach liquor from iron ions was followed by zinc electrowinning. Final product of 99.5% purity at a current efficiency of 92% was obtained.

Currently, 80 %– 85 % zinc is produced from zinc sulfide concentrates by the hydrometallurgical methods of roasting-acid leaching-puri- fying-electrowinning process or oxygen pressure acid leaching-purifying-electrowinning process worldwide [4].

The toxicity characteristic leaching procedure (TCLP) results indicated the water-leaching flotation process not only recycled valuable metals such as zinc and silver in zinc-containing hazardous wastes but lowered the hazardous waste levels to those of general wastes and recycled wastes in an efficient, economical, and environmentally

In response to the problem of additive zinc concentrate consumption and inefficient reduction of ferric ion (Fe3+) in the acid-leaching solution of zinc hydrometallurgy when employing zinc sulfide concentrate, various parameters were examined. These included particle size, temperature, addition coefficient of the …

The use of residue has flaws, most notably the low quality of the process output. In this paper, calculating the optimum points of process variables using residue with the data mining approach is suggested. As a real case, one of the operations of the zinc ingot production process, i.e., pulp and acid leaching operations, are studied.

Iron control in zinc pressure leach processes. The occurrence of zinc in sulfide ore deposits is generally accompanied by various iron minerals. Hence, even the most efficient concentrators generally produce a zinc concentrate with significant iron content. The efficient recovery of zinc metal from zinc concentrates requires the …

Zinc leaching residue (ZLR), produced from traditional zinc hydrometallurgy process, is not only a hazardous waste but also a potential valuable solid. The combination of sulfate roasting and water leaching was employed to …

Therefore, in this research work, factors that affect the leaching efficiency of copper such as temperature, acid concentration, mixing power and particle size have been studied systematically using sulfuric acid. The produced copper rich leach solution has the potential to be integrable into state-of-art copper electrowinning process.

The aim of this paper is based in analyze of the zinc sulphate solution obtained from neutral leaching process of zinc calcine in "Trepca" and its purification from impurities.

Zinc Leaching and Purification. Typical process of zinc hydrometallurgy consists of zinc concentrate roasting, calcine leaching, electro-winning, ingot casting and acid-making. Zinc leaching is performed in diluted sulfuric acid system or ammonium system. The leaching acidity, temperature and pressure are regulated to achieve the most optimal ...

This paper discusses the spent alkaline batteries characterization and leaching stage experiments results with sulfuric acid as leachant, as part of a complex system, involving purification and electrolytic stages, aiming the Zn recovery. After dismantling batteries by mineral processing techniques, the black powder sample …

The traditional leaching process of silver from zinc leaching residue has shortcomings such as higher acid or ammonium concentration, resulting in strong corrosion and serious pollution.

The present study reveals an effective process to recycle the Pb-free solders. The low concentration of acetic acid was also found significant for metal leaching from solder. The research provides basic knowledge for recovery of metals from Pb-free solders.

It was established that during the leaching process, silicate compounds of alkaline earth metals, in addition to calcium and magnesium carbonate compounds, would affect the levels of sulfuric acid consumption, thereby actively lowering the …

The aim of this study is to design and develop an efficient leaching process based on a fundamental and theoretical thermodynamic analysis and the optimization of the operation parameters via the response surface methodology (RSM). Using this methodology, the design of a leaching process for the recovery of copper, silver, and …

Super-hot acid leach residue is generated during zinc production in the roasting–leaching–electrowinning route, where both primary and secondary resources are used as feed material. This residue may contain valuable metals, such as lead, zinc, and iron, as well as precious metals, such as gold and silver. Four materials, namely super …

Abstract. The direct pressure leaching of zinc sulphide concentrates to produce zinc sulphate solutions suitable for recovery of zinc by electrowinning, while oxidizing the sulphide sulphur only ...

The research was to investigate the amenability of zinc concentrate with high gallium to pressure oxygen leaching. The particle size, sulfuric acid concentration, oxygen partial pressure, additive amount, and time of reaction were studied. The extraction yields of gallium and zinc are 86 % and 98 %, respectively.

Kinetics, as a fundamental requirement of nearly all industrial activities and engineering researches, plays a great role in leaching processes.

From the pure metallic solutions, the pure metal and its salt could be produced using electrolysis, evaporation, crystallization etc. The novel pyro-hydro hybrid metallurgical process consists of pyrolysis–beneficiation–leaching–solvent extraction for the recovery of metals from scrap PCBs is reported.

Effect of time reaction on leaching In the leaching process, it takes a certain time for citric acid to completely dissolve the zinc and manganese metal that present in the Zn-Mn batteries powder.

This paper concerns the recovery of Zn and Mn metals from Zn-C and alkaline spent batteries with leaching method using citric acid as the environmental friendly leaching reagent.

Castro, 1992 evaluated different processes viz. caustic leach–zinc electrowinning, ammonia leach–zinc precipitation and acetic acid leach-lead, zinc hydroxide and gypsum precipitation to recover metal and produce environmentally acceptable residue from EAF dust.

Our expertise and experience provide the path to optimized solutions and complete plants for the production of high-quality zinc, from a wide range of zinc raw materials. Outotec ofers innovative and proven roasting, leaching, precipitation, solution purification, solvent extraction, Ausmelt TSL smelting, electrowinning and casting tech-nologies as …

An electric field enhanced leaching process was proposed to improve the leaching efficiency in the process of extracting Li, Ni, Co and Mn from waste lithium ion batteries. The leaching process was optimized and the leaching mechanism was studied by means of leaching experiments, product characterization and leaching kinetics.

Keywords Copper–cadmium-bearing slag; Catalytic oxidative acid leaching; Activated carbon; Kinetics 1 Introduction Zinc is the third most common nonferrous metal after alu- minum and copper, which has wide application in …