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However, alkaline leaching processing is often confronted with the problem of lowgrade complex ores, especially zinc silicate. The low solubility of these ores does not usually allow for the recovery of the target metal, even by direct chemical leaching in many leaching reagents Zhao et al ., 2009 .Chat Online
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The invention relates to a method for the leaching of oxidized ores and in particular zinc ores. the ore, wherein the valuable metals are at least partially in silicate form, are routed to an acidic leaching stage in conditions where the silicate decomposes and the valuable metal ion comes into the solution. during leaching the silicate ion first dissolves, but simultaneously decomposes and is ...
Bodas, m.g. 1996 hydrometallurgical treatment of zinc silicate ore from thailand, hydrometallurgy 4012 3749. google scholar brinker, c.j. and scherer, g.w. 1990 solgel science the physics and chemistry of solgel processing , academic press, boston.
Apr 23, 2017183 leaching plant zinc ore separation efficient sulfuric acid leaching of zinc silicate ore under pressure . the obtained results show that the acid leaching of zinc silicate ore under pressure was found to be more efficient compared to other zinc hydrometallurgical process in terms of decreased dissolution of silica and iron and increased zinc extraction.
Keywords alkaline leaching, calcium zincate, nonsulfide zinc ore, smithsonite, zinc carbonate 1. introduction zinc is an industrially important bluishwhite, lustrous, low boiling point metal, and often used for galvanization and alloying. it has a valence of 2 and may form complexes with ammonia, halide ions, etc. graf, 2005 ilzsg, 2017.
Effects of some parameters such as leaching time, acid concentration, leaching temperature, particle size and solidliquid ratio were studied for maximum zinc extraction and minimum acid consumption. optimum leaching conditions were determined to be 120 minutes of leaching time, 55 gl h 2 so 4 of acid concentration, 25 c of leaching ...
A new ligand selection model is proposed for leaching of low grade zinc oxide ores. the model demonstrates that the formation constant between ligand and zinc ions plays a significant role in the leaching process. a series of leaching experiments with different ligand concentration are conducted to assess the selection model.
Dec 17, 1996nbsp018332the zinc vapor is oxidized, and the formed oxide is conducted to the second stage of neutral leaching. the zinc silicate coming along with the zinc oxide is not dissolved, but circulates back into the furnace, so that it does not constitute any drawback for the process. in the waelz furnace the iron and silicate of the zinc concentrate form an ...
The aim of the study was extraction of zinc from smithsonite by ammonia leaching on cerussite flotation tailings. initial lead and zinc grades of the ore were 13.31 and 27.86, respectively. as a result of a series of cerussite flotation tests, a lead concentrate containing 63.25 pb was produced with 82.76 recovery. after that,
Tank leaching was found to be most effective for the treatment of ore concentrates and more than 80 of the total zinc was extracted from a zinc sulfide concentrate . tank leaching is more expensive to construct and to operate than dump, heap, or in situ leaching processes.
Znfe2o4 and zinc silicate 2zno.sio2 in the leach residues. initially, water leaching experiments were carried out to determine water soluble amount of blended leach residue, and the maximum zinc recovery was obtained as 18 . after these trials, sulphuric acid and brine leaching were used to recover zinc and lead, respectively.
Nov 24, 2017nbsp018332he, s., wang, j. amp yan, j. pressure leaching of synthetic zinc silicate in sulfuric acid medium. hydrometallurgy 108 , 171176 2011. cas article google scholar
Based on a comprehensive analysis, it can be concluded that in contrast to hemimorphite zn 4 si 2 o 7 oh 2 183 h 2 o, amorphous smithsonite znco 3 and zinc silicate zn 2 sio 4 prove to be refractory phases under ammonium sulfate leaching, while sodium citrate has a better chelating action with the refractory phases, resulting in a higher ...
Mechanisms of zinc incorporation in aluminosilicate crystalline structures and the leaching behaviour of product phases. tang y1, shih k1. author information 1a department of civil engineering , the university of hong kong , pokfulam road, hong kong , sar peoples republic of china.
Abstract the leaching kinetics of zinc silicate in ammonium chloride solution was investigated. the effects of stirring speed 150400 rmin, leaching temperature 95108 176c, particle size of zinc silicate 61150 m and the concentration of ammonium chloride 3.55.5 moll on leaching rate of zinc
The results of a leaching kinetics study of lowgrade zinc silicate ore with sulfuric acid are presented. effect of ore particle size, reaction temperature, and acid concentration on zinc ...
This paper reports an acid leaching process study on the selective extraction of base metals from complex sulfidic, silicatecontaining zinc ore containing sphalerite, hemimorphite, smithsonite ...
Kinetics of sulfuric acid leaching of lowgrade zinc . the results of a leaching kinetics study of lowgrade zinc silicate ore with sulfuric acid are presented. effect of ore particle size, reaction temperature, and acid concentration on zinc dissolution rate were determined. the results obtained show that leaching of about 94 of zinc is ...
The zinc leaching rate of the roasted sample was 97.62 in nh 4 clnh 3 h 2 o leaching system, which increased by 91.57 compared with zinc leaching rate of 6.05 when willemite was directly leached in nh 4 clnh 3 h 2 o system.
Analytical grade zno or by aircalcination of zinc hydroxides, was studied in 0.25, 0.5 and 1m h2so4 at 20, 40 and 60176c. zinc hydroxides were precipitated from pure solution of znso4 or from a model contaminated solution of znso4 or from leach liquors originated from leaching waste galvanic sludges in 0.5 m h2so4 with 50 solution of naoh.
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Silicate, phosphate or silicone with zinc, which may be both free and combined.quot one sales brochure covering a commercial line of inorganic zinc paints indicates that the dry applied film contains 89 zinc by weight when either the companys inorganic silicate type of paint or the ethyl silicate type is used.
The natural oxidized zinc ores oxide, carbonate, and hydrated silicate frequently do give trouble in the leaching plant since considerable amounts of silica can be dissolved from them and it requires but 2 or 3 gm. of silica to gel a liter of solution.
Leaching was performed to recover zinc from a zinc leach residue which contained 9.87 zn and 4.93 fe. during sulfuric acid leaching, fe was dissolved as well as zn which can reduce the zn extraction efficiency.
58 and 20 germanium occurred in the ferrite and silicate phases, respectively. leaching of zinc residue with high germanium was investigated as a process to recover germanium. it was found to be much more effective using sulfur dioxide as a reductant.
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