Us5645708a chloride assisted hydrometallurgical copper. The main aim of this work is to propose a feasible method for the extraction of lead from leadcontaining zinc leaching residues. Sulphide ores and concentrates most zinc ores occur as sulphides and, as such, are amenable. The zinc is then stripped from the zinc loaded organic solvent with a solution of nitric acid to. Zinc and other metal values are then selectively stripped with sulfuric acid, generating a neutral solution of zinc sulfate suitable for electrolytic production of zinc metal. Review of hydrometallurgical recovery of zinc from. The method proposed is a combination of pyro and hydrometallurgical treatments of the waste material. Of brass and bronze in prehistoric southwest asia pdf. Citescore values are based on citation counts in a given year e. Zinc blende is concentrated by floath floatation process.
The highest zinc extraction was obtained at low acid concentration of less than 1 moll in the order of h 2 so 4 followed by hno 3 and then hcl. Zinc oxide can also be produced as a byproduct of some chemical reactions such as in the production of sodium dithionite. The process comprises the steps of contacting a zinc solution with an insoluble organic solvent selective to the extraction of zinc and thereby produce a zinc loaded organic solvent. Download pyrometallurgical extraction of zinc pdf files. Hydrometallurgical extraction of zinc from jordanian. Principles of extractive metallurgy rakes h kumar email. Zinc is refined by froth flotation of the ore, roasting, and final extraction using electricity. The pulverized ore is kept in large tank containing water and pine oil. The kinetics of zinc extraction using h 2 so 4 showed a maximum zinc recovery of 72% obtained by using 0. Solvent extraction in the primary and secondary processing of zinc subject of investigation for some time.
Hydrometallurgical extraction of zinc from jordanian electric arc furnace dust hydrometallurgical extraction of zinc from jordanian electric arc furnace dust shawabkeh, reyad a. The major obstacle in the hydrometallurgical extraction and beneficial reuse of zinc is the presence of highly stable zinc ferrite znfe2o4. Data concerning the preparation of antimony and complex ores by pyrometallurgical and hydrometallurgical methods, as well as results on developing a procedure for the hydrometallurgical processing of slime antimony concentrates using. Alternative solution purification in the metallurgische. This decrease of extraction efficiency, very small compared with the zinc extraction in alkali medium is due to the saturation concentration of zinc and manganese in acidic solutions, much higher than in alkaline solutions. Iexpect that many persons would citethefactthat, whereas the 1960s.
Zinc smelting is the process of converting zinc ores into pure zinc. Electrolytic and hydrometallurgical processes free download as powerpoint presentation. How copper is extracted, crushed, and sent to the two major processing methods. The regenerated organic, rh o is recycled back to the previous extraction step. Study concerning the recovery of zinc and manganese from. Us6338748b1 hydrometallurgical method for recovery of. Efficient recycling of pb from zinc leaching residues by. The treatment of metal or the separation of metal from ores and ore concentrates by liquid processes, such as leaching, extraction. Hydrometallurgy involve the use of aqueous solutions for the recovery of metals from ores, concentrates, and recycled or residual materials. Recovery technology of zinc from hydrometallurgical zinc. The precipitation of jarosite group phases is used in hydrometallurgy, especially the zinc industry, to control fe, sulphate, alkalis and other impurities groat et al. A hydrometallurgical process for producing zinc oxide from an aqueous solution containing zinc ions is provided. Alternatively, zinc sulfate can be crystallized directly from the organic phase by stripping with concentrated sulfuric acid.
The regenerated organic, rho is recycled back to the previous extraction step. A method for processing of metallurgical waste materials chemically defined as sulfurbearing zinc ferric materials produced by plants processing zinc ores and their concentrates is proposed. The process uses hydrochloric acid solutions to extract zinc from electric arc furnace dusts containing zinc oxide and zinc ferrite. Hydrometallurgical process for recovery of cobalt from zinc plant residue hydrometallurgical process for recovery of cobalt from zinc plant residue wang, yan. Pyro and hydrometallurgical copper processing p3 youtube. The loaded zinc is stripped from the organic extract by the zinc spent electrolyte. Due to the difficult situation in the country since the nineties, the collapse of the mining industry was the main reason why zinc production in kolwezi went down. To selectively leach zinc and minimize iron dissolution by precipitating as feo. After determination of the components of the residue, water leaching, acid leaching and roastingleaching were performed to reclaim zn. Oh and fe 2 o 3, hot acid leaching with the aqueous solution containing 37 gl74 gl hcl and 104 gl270 gl zncl 2 is used. In this work, it was aimed to select and propose a feasible as well as an applicable method, or series of methods for the extraction of zinc. In hydrometallurgical processing of zinc sulphide concentrate, leach residue, puri.
Hydrometallurgical separation of zinc and copper from waste brass. Zinc sulphide and zinc carbonate are the main source of zinc production however it is partly produced from various complexes and wastes such as zinc ash, zinc dross, eaf dusts, scraps and slags by pyrometallurgical, hydrometallurgical or their combination processes 89. Extraction of zinc application of zinc refining process. Hydrometallurgical processes of antimony extraction from. The effects of reaction time, reaction temperature, calcium chloride concentration, liquidsolid ratio, and ph studied.
As leaching duration gets longer, extraction rate of zinc gets higher both for 5 and 7 m concentrations. Experiments revealed the positive effect of high ammonia concentration and longer leaching duration on extraction rate of zn. Results showed that the co extraction of zinc ii and iron iii increased with increasing. Zinc smelting has historically been more difficult than the smelting of other metals, e. Hydrometallurgical extraction of zinc from zinc ferrites. Base metals recovery from zinc hydrometallurgical plant.
A method is provided for extracting copper, cobalt and zinc from an ore containing those metals and manganese dioxide. Interestingly, however, the first commercial application of zinc sx on the mainstream process liquor will be for the exploitation of an oxide orebody. The ore is subjected to an acid, oxidizing leach followed by an acid, reducing leach. Chloratebased oxidative hydrometallurgical extraction of. Hydrometallurgy is a technique within the field of extractive metallurgy, the obtaining of metals from their ores. Wo1998014623a1 hydrometallurgical extraction of copper. Hydrometallurgical route for copper, zinc and chromium recovery from galvanic sludge. Extraction of zinc from zinc blende grade 12 science notes. Filter ash resulting from the thermal treatment of household waste was extracted with a throughput of 3. The quantity of eaf dust generated per year around the world represents a possible recovery of about 900 t of zinc. Ilias s, schimmel ka, yezek pm 1999 nondispersive liquidliquid extraction of copper and zinc from an aqueous solution by debpa and lix 984 in a hollow fiber membrane module. The free zinc ion in solution is highly toxic to plants, invertebrates, and even.
The decrease of extraction efficiency is very low for zinc, from 92% to 91%, and higher for manganese, from 38% to 30%. Hydrometallurgical processes development for zinc oxide. Read chloratebased oxidative hydrometallurgical extraction of copper and zinc from copper concentrate sulfide ores using mild acidic conditions, hydrometallurgy on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at. Hydrometallurgical extraction of zinc and copper a 57 fe. Solvent extraction in the primary and secondary processing. The invention provides a process for extracting zinc from a sulphur and zinc containing ore which involves a leaching the sulphur ore or concentrate with an aqueous solution of cupric chloride, which can be regenerated by means of a regenerating agent and air. Electrolytic and hydrometallurgical processes chemical. Purification processes including copper solvent extraction and cementation of the other. Base metals recovery from zinc hydrometallurgical plant residues 19 cementation of copper, cadmium and cobalt on zinc powder, with copper and cadmium being recovered as byproducts. Pdf zinc solvent extraction in the process industries.
Hydrometallurgical treatment of zn sulphide ore involves separation of zn from fe, as most zn processing concentrates contain 5%12% fe. Us4288304a hydrometallurgical process for treatment of. Historically extraction of zinc has been more difficult than extraction of other metals because at temperatures where metals such as iron typically begins to melt, zinc is a gas. Part of zinc hydrometallurgy and zinc solvent extraction includes the zinc and iron sulphate solution from the hot acid leach will typically contain 80100 gl zn, 2030 gl fe, mostly in the ferric state, and 4060 gl free sulphuric acid. The amount of zinc in this form is about 50% of the. Pdf hydrometallurgical extraction of zinc and copper a. Us5645708a us08425,117 us42511795a us5645708a us 5645708 a us5645708 a us 5645708a us 42511795 a us42511795 a us 42511795a us 5645708 a us5645708 a us 5645708a authority us unite. Extraction of zinc from smithsonite by ammonia leaching. Us5441712a hydrometallurgical process for producing zinc. In the present investigation a zinc copper ore from the maranda mine, located in the murchison greenstone belt, south africa, containing sphalerite zns and chalcopyrite cufes2, was studied.
Sulfuric, nitric and hydrochloric acids were used at different concentrations to recover zinc from dust. Solids are separated from the leachate and the leachate liquid is subjected to solvent extraction steps, to sequentially remove copper, zinc and cobalt in that order. Hydrometallurgical article about hydrometallurgical by. Hydrometallurgical processes hydrometallurgical processes play an important role in the extraction and recovery of cadmium from various media. This study is focused on the development of a hydrometallurgical process which allows the zinc recovery from waelz oxide wo.
The major obstacle in the hydrometallurgical extraction and beneficial reuse of zinc is the presence of highly stable zinc ferrite znfe 2 o 4. The most commonly used route in the hydrometallurgical extraction of zinc and copper from a sulphide ore is the concentrateroastleachelectro winning process. The most commonly available ore used in the extraction of zinc is called zinc blende also known as zinc sulphide zns. Proposed process for recovering of silver, gold, lead, and zinc from complex ores.
The amount of zinc in this form is about 50% of the total zinc. Tables 61 and 62 provide capsule summaries of these processes. So, it must allow the production of a widely used compound, mainly in tyre and ceramics production processes, from industrial residues such as eaf dusts considered as toxic and hazardous wastes thws, from which. Processing techniques that complement hydrometallurgy are pyrometallurgy, vapour metallurgy, and molten salt electrometallurgy. Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties topics covered include. Roastingleaching was found to be effectively for zn extraction by controlling acid mass, roasting duration and. The residue contains a great quantity of active carbon and zinc sulfate. Hydrometallurgical process for recovery of cobalt from. Different ways of extraction of zinc and their comparisons 3. Hydrometallurgicalaqueous recovery of metals springerlink. Recovery of high purity zinc from filter ash produced.
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