0086-21-58386256
Oxidation in an autoclave with sulfuric acid has been shown to extract 95 to 99 pct of the zinc present, ... Direct leaching zinc-sulfide concentrates by Sherritt Gordon @article{Forward1959DirectLZ, title={Direct leaching zinc-sulfide concentrates by Sherritt Gordon} ...
25-11-2017· Oxidation in an autoclave with sulfuric acid has been shown to extract 95 to 99 pct of the zinc present, produce a quantitative amount of elemental sulfur, Direct leaching zinc-sulfide concentrates by Sherritt Gordon | SpringerLink
Sulphuric acid leaching of zinc and copper from . not allow the recovery of metal by direct chemical leaching (Hiskey and Wadsworth, Sulphuric acid leaching of zinc and Nigerian sulphide ore, zinc, copper, Inquire Now; Thiosulfate Leaching as an Alternative to Cyanidation ; 5/5018332Inquire Now [PDF] Alkaline Oxidative Leaching of GoldBearing
1)oxidative leaching by hydrometallurgy. 2)leaching [] [li:t?] [] [lit?]. 1.The technical features and worldwide application of direct extraction technology used for leaching of low-grade copper resources are introduced in this paper., …
01-05-2002· Zinc recovery from sphalerite concentrate by direct oxidative leaching with ammonium, sodium and potassium persulphates
Determination of effective parameters in pilot plant scale direct leaching of a zinc sulfide… 605 Fig. 1. XRD pattern of zinc sulfide concentrate Fig. 2. Schemes of leaching setup 1) tubular reactor 2) steam input 3) air inlet 4) pump 5) tap off 6) primary tank 7) electromotor 8) liquid …
Oxidative leaching is one of the major processes applied for the zinc recovery from sphalerite and many researchers have investigated its kinetic analyses [2] [3][4][5][6][7][8]. ...
01-12-2013· The leaching behavior of main metallic sulphides in zinc concentrate under atmospheric oxygen-rich direct leaching conditions was studied through mineralogical analysis. The results show that the sulphides dissolve obviously except pyrite. Based on the relationship between elemental sulfur and the residual sulphides in the leaching residue, the ...
industrialized, in which zinc sulphide concentrate is directly leached and the sulphidic sulfur is oxidized to elemental form rather than to SO2, so that the pollution of SO2 is completely avoided. The ZPL process offers an attractive alternative to roasting in the expansion plans of existing zinc plants, or in the design of new facilities.
01-02-2017· 1. Introduction. Direct oxidative leaching of zinc sulphide concentrates in an acidic environment is a complex process. It involves reactions between ZnS and the oxidizing agents at the reacting surface of the concentrate particles, decrease of the active surface area of the particles as the reaction proceeds, intraparticle diffusion of oxidants in the pores of the particles, gas–liquid and ...
01-04-2005· That is why this paper presents the results of a laboratory investigation on oxidation leaching of chalcopyrite concentrate (Slovakia) in the presence of manganese polymetallic nodules (Clarion–Cliperton ore field) in a hydrochloric acid medium with special attention to copper, zinc…
16-03-2019· Consumption of zinc metal has been rapidly increased in the world. Zinc metal exists as oxide, sulfide, carbonate and silicate ores, among which zinc oxide ores have not been mined because it is very difficult to separate zinc from gangue or to concentrate using the conventional flotation processes. In the current study, a low-grade zinc oxide ore containing 5.9% Zn, 33.4% Fe and 13.7% Mn was ...
01-12-2013· In the 1980s, the innovative process of zinc pressure leach (ZPL) was industrialized, in which zinc sulphide concentrate is directly leached and the sulphidic sulfur is oxidized to elemental form rather than to SO 2, so that the pollution of SO 2 is completely avoided.
The recovery of zinc from sphalerite concentrate by oxidative leaching with ammonium, sodium and potassium persulphates in sulphuric acid media is reported in this investigation.
The present work reports the direct leaching of zinc from a sphalerite concentrate in acid media. Lab-scale and pilot-scale experiments were conducted in atmospheric-pressure and low-pressure reactors, respectively. Leaching of zinc and precipitation of iron was achieved in the same stage using different reagents like Fe3+, O2, O3, and Fe2+ (which is continuously oxidized in the leaching ...
17-04-2020· Experimental conditions used for the lab-scale experiments of direct leaching of zinc from sphalerite concentrate. Oxidant [Fe2+], M Pulp Density, g/L H2O2 (50%) 0.05 200 O2 (99.5%) 0.05 50 O3 (3%) 0 50 O3 (3%) 0.05 50 2.2. Pilot-Scale Experiments Pilot-scale experiments of direct leaching of zinc from sphalerite concentrate (D80 particle size =
However, direct oxidative leaching of zinc sulphide in sulphuric acid has been employed industrially. The merits of the process are that high zinc recoveries are achieved and iron is rejected in its insoluble form and sulphur produced in its non-pollution elemental form. II.
09-08-2020· Zinc sulphide ores can be treated by bioleaching through direct or indirect mechanism . In the direct bioleaching mechanism, Zn is extracted by direct oxidation of insoluble zinc sulfide to soluble zinc sulfate, which is catalyzed by sulfur-oxidizing bacteria (SOB) such as Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans, as shown in Eq.
2.4 Direct oxidative pressure leaching of zinc sulphide 50 2.5 Oxidation of copper (I) in sulphate media 57 2.6 Oxidation of copper(I) in ammoniacal sulphate media 64 CHAPTER 3 EXPERIMENTAL PROCEDURES AND EQUIPMENT 72 3.1 Preliminary experiments 72
01-08-2018· The use of ozone as an oxidant for the direct leaching of zinc sulfide (sphalerite) concentrate in sulfuric acid medium under atmospheric pressure was explored. The influence of acid concentration, feed gas injection rate, particle size distribution, stirring speed, temperature and slurry density on zinc extraction efficiency was examined. The experimental results showed that the leaching ...
A method for leaching zinc sulphide concentrates at atmospheric pressure, in an open tank, integrated into a conventional hydrometallurgical process (roasting-leaching-electrolysis). The leaching of the zinc concentrate is carried out in two stages in countercurrent, using as a sulfur oxidant a precipitate of ferric hydroxide that is generated in a neutralization-oxidation stage of the ...
Chapter 2 Direct Leaching of the Low Grade Copper Ore. This chapter . describes. the direct atmospheric and high pressure oxidative leaching (HPOL) of lowgrade ores (copper grade 0.4 mass% CuFeS. 2. as the main copper mineral) under a variety of sulfuric acid concentrations (0 1.0 M). It can be seen from the results that both
The research work presented in this paper is on a Biomining The estimated annual demand for zinc in India is approximately 2.41 lakh tones; against this, the present installed capacity in the country for zinc ingots is 1.49 lakh tonnes only. There
17-04-2020· The present work reports the direct leaching of zinc from a sphalerite concentrate in acid media. Lab-scale and pilot-scale experiments were conducted in atmospheric-pressure and low-pressure ...
01-05-2002· Oxidative leaching of zinc with ammonium persulphate The effect of particle size on the leaching of metal from the zinc concentrate was studied. In these experiments, the initial sulphuric acid concentration 5% (v/v), leaching temperature (333 K), pulp density (10%) and the amount of ammonium persulphate 20% (w/v) were maintained constant as shown in Fig. 1 .
In the field of hydrometallurgy, the industrial uptake of leaching models has been overlooked partially due to the lack of universal models. A model developed for one plant cannot easily be transferred for the application of a different plant without redesigning the leaching kinetics in the code. The Multiple Convolution Integral (MCI)-based model developed in this thesis has the ability to be ...