Previous investigations of the ferric chloride brine leaching of galena concentrate have shown that additions of chloride ion result in accelerated dissolution rates. The current study has provided the necessary information to extend and modify these previous results by incorporating the important effect of chloride ion on the dissolution kinetics.
sulphur reaction product on the leaching of galena in ferric chloride media,” Metallurgical transaction B, vol. 21B, pp. 935-943, 1990.  J. E. Dutrizac and R. J. C. Macdonald, “The dissolution of sphalerite in ferric chloride Solutions,” Metallurgical
Chloride leaching of silver and lead from a solid residue after atmospheric leaching ... Galena grain before leaching Fig. 3. Galena grain leached partially Fig. 4. Galena grain after atmospheric leaching The dominating copper mineral identified in the feed for chloride leaching was
Chloride leaching of silver and lead from a solid residue ... leaching Fig. 3. Galena grain leached partially Fig. 4. Galena grain after atmospheric leaching The dominating copper mineral identified in the feed for chloride leaching was chalcopyrite with a small admixture of bornite and covellite.
Abstract. The kinetics of dissolution of galena (PbS) in CuCl 2-HCl-NaCl media have been investigated using the rotating disk technique.Rapid nonlinear kinetics are observed over the temperature range 45 °C to 90 °C and for NaCl concentrations from 0 to 4.0 M.
Model for predicting the initial solution pH at pre-assumed final pH and concentration of dissolved zinc, during leaching of galena in butanoic acid solution has been derived. The model; α = 1.4γ/ln[(Zn) 1/3 shows that the initial pH of the leaching is dependent on the values of the pre-assumed final solution pH and concentration of dissolved zinc.
This article presents a series of studies on the nonoxidative leaching of galena with hydrochloric acid in the presence of a metallic chloride. A systematic study was carried out using a succession of metallic chlorides with cations of different valencies in an attempt to generalize the leaching …
dissolved zinc, during leaching of galena in butanoic acid solution has been derived. The model; ... Fe3+, Cl-and H+ are coupled, and that the reaction kinetics and the mechanism of ferric chloride leaching of PbS have not been clearly established . Rapid parabolic kinetics were observed in
efficiency of ferric chloride as an oxidant for galena leaching. Fig. 10: An Arrhenius plot for the leaching of 20 x 40 mesh galena with 0.1M Ferric Nitrate . An Arrhenius plot (Figure.10) was made for the system under study which gave an activation energy of 47.63 kJ/mole as follows: R. Ae E/ RT (7) where . K = rate constant = 1/t. comp. A ...
PDF | Abstract (Received September 25, 1999; revised January 19, 2000) Experiments on the quantitative leaching of lead from galena in hydrochloric acid solutions are reported. The effects of ...
Abstract The kinetics of dissolution of galena (PbS) in CuCl 2-HCl-NaCl media have been investigated using the rotating disk technique.Rapid nonlinear kinetics are observed over the temperature range 45 °C to 90 °C and for NaCl concentrations from 0 to 4.0 M.
Feb 01, 2014· Read "The kinetics of leaching galena concentrates with ferric methanesulfonate solution, Hydrometallurgy" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Electrogenerative leaching is a new research field in hydrometallurgy. In the present paper, various factors affecting the electrogenerative leaching of galena with ferric chloride have been studied. It was obvious that the low resistance ion membrane and high active electrode of …
The kinetics of leaching galena with ferric chloride and ferric nitrate have been examined as a function of ferric concentration, salt concentration, temperature, and particle size. Diffusivity of ferric complex ions was also established as a function of ferric chloride concentration and temperature.
the galena leaching rate to decrease rapidly. A minimum leaching rate was realized in saturated PbCl2 solutions (Dutrizac, 1986). Studies(Dutrizac, 1986) on the ferric chloride brine leaching of galena concentrate have been carried out. The results of the investigation reveal several advantages of ferric chloride over the reagents as
"The U.S. Bureau of Mines investigated a hydrothermal sulfidation (hts) and chloride leaching procedure to recover lead and silver from plumbojarosite. The plumbojarosite, generated during pressure- oxidatve leaching of zinc concentrate in a commerci...
The leaching of lead from galena in acidic hydrogen peroxide in presence of sodium chloride solution has been investigated with respect to the effects of hydrochloric acid and hydrogen peroxide concentrations, by changing the stirring speed, leaching temperature and the particle size.
The procedure involves leaching galena flotation concentrates with ferric chloride (fecl3) solution to obtain lead chloride (pbcl2) and elemental sulfur as expressed by the following chemical reaction: pbs + 2fecl3 -> pbcl2 + 2fecl2 + s deg. At 100 deg c, over 99 pct of the pbs in the concentrate is converted to pbcl2 in less than 15 min.
The method consists of leaching galena concentrate with ferric chloride-sodium chloride solution, cooling the solution to crystallize PbCl2, electrolyzing the lead chloride in a molten-salt bath to produce lead metal and chlorine and using the chlorine to regenerate ferric chloride in …
structure. At the sphalerite leaching with 0.04 wt. % of iron by ferric chloride, the activation energy was about 70 kJ / mol, while the sphalerite leaching with 12.5 wt.% of iron, activation energy was about 40 kJ / mol. The presence of 5% galena in sphalerite concentrate decreases the leaching rate of zinc up to 13%, while the presence of 10%
Ferric chloride leaching is a potentially attractive method of processing lead concentrates, and many studies have been carried out on the kinetics of dissolution of galena (PbS).
LEACHING Ferric Chloride Because Wong (7) extensively investi gated extraction of lead from galena con centrates, only minimal effort was ex pended to investigate the FeC13 leaching phase of the process. However, because Wong's work was with a high-grade galena …
Chloride leaching by an increase X (%) in the X-ray amorphous portion of mineral compared with the reference sample (non- The leaching of complex copper – lead – zinc sul- activated), which is assumed to correspond to phide concentrate may be described by the Eq.
better oxidant for ferric salt leaching of Enyimgba galena. Report  has also shown that galena concentrate could be leached in ferric chloride brine. The results of the investigation reveal several advantages of ferric chloride over the reagents as a leaching media which includes that it exhibits
recovered from galena applying hydrometallurgical method, i.e. leaching by oxidant solutions, namely by iron(III) salt in the form of FeCl3 (Dutrizac, 1986). In the process of bioleaching chloride anion, which is toxic for microorganisms, is replaced by sulphate anion. The course of reaction of chemical and biological leaching of galena
A Comparative Study of Cyanide and Chloride – Hypochlorite Gold Leaching of Oxide Ore from Placer, Surigao Del Norte An Undergraduate Thesis Presented to the Faculty of the Department of Metallurgical, Ceramics and Mining Engineering College of Engineering MSU-Iligan Institute of Technology In Partial Fulfillment of The Requirements of the Degree of BACHELOR OF SCIENCE IN METALLURGICAL ...
The XRD analysis of the leaching residue with no oxidant showed the presence of galena, sphalerite and chalcopyrite, while the residue of the leaching with oxidant showed anglesite (PbSO 4 ), galena, sphalerite, sulphur and pyrite. Lead extractions were increased by the increase of temperature and concentration of fluorosilicic acid.
Chloride–hypochlorite oxidation and leaching of refractory sulfide gold concentrate 63 Fig. 1. The Pourbaix diagram of Fe–S at [Fe] –= 10 4 M, [S] = 10– M and 25 C (the chlorine species regions are also marked) (Marsden and House, 2005) Fig. 2.
The galena concentrate used in ferric chloride leaching was a concentrate from southeastern Missouri. Analysis of the concentrate is shown in Table 1. The lead concentrate contained primarily galena and small amounts of chalcopyrite, sphalerite, marcasite, and siegenite. The gangue material contained a small concentration of dolomite.
Sep 01, 2003· Read "Electrogenerative leaching of galena with ferric chloride, Minerals Engineering" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
The leaching tests were conducted in a covered 1 L glass reactor with three baffles. Openings were incorporated in the cover for insertion of a stirring rod, a thermometer, a condenser, nitrogen sparger (to prevent oxygen ingress) and two sampling ports (one port for adding sieved galena samples and one port for withdrawing solution samples).
Kinetics of Leaching Galena Concentrates with Ferric Fluosilicate Solution by ALAN AIRONG CHEN B. Eng., Central South University of Technology, China, 1983 M. Eng., Institute of Chemical Metallurgy, Academia Sinica, 1986 A THESIS SUBMITI’ED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in
A comparative study of the dissolution kinetics of galena ore in binary solutions of FeCl3/HCl and H2O2/HCl has been undertaken. The dissolution kinetics of the galena …