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Study on the improvement of the zinc pressure leaching process

Aug 01, 2020· The Iijima Electrolytic Zinc Plant in Japan used the SO 2 reductive pressure leaching process to extract Zn, Ga and In at the temperature range of 100 to 110 °C and SO 2 pressure in the range of 152 to 202 kPa [Cheng and Demopoulos, 2004; Arima and Kudo, 2004; Arima et al., 2006], to leach more than 90% of Zn and 90% of Ga. BGRIMM and Dan Xia smelter carried out the lab and

Modeling the kinetics of the zinc pressure leaching

The model is further verified through bench scale pressure leaching experiments where 94 % of the zinc is extracted within 90 minutes using a concentrate sample from the same industrial plant. The effect of temperature is analyzed and the activation energy is calculated to be 40.8 kJ/mol. Interesting discoveries with respect to the reagent

Zinc pressure leaching at Cominco - ScienceDirect

Oct 01, 1995· Zinc Pressure Leach Downtime Analysis - Last Half of 1994. 3.3. Production capacity Since 1984, the zinc pressure leach plant has achieved production rates in excess of the original design capacity. Experience through to 1988 has been reported previously [ 5 ], and at that time, the outlook for future production was good.

Integration of Sherritt Zinc Pressure Leach Process at

Integration of pressure leaching with the existing roast-leach-electrowinning facility has increased zinc production capacity by at least 50 000 tonnes per year slab zinc. The Sherritt Zinc Pressure Leach Process was selected for the plant expansion, to achieve high zinc recovery from a wide range of zinc concentrates while meeting the stringent environmental regulations governing the Ruhr-Zink

Operation of the Sherritt Zinc Pressure Leach Process at

The Sherritt Zinc Pressure Leach Process has been applied successfully at the HBMS zinc plant in Flin Flon, Manitoba since 1993. The HBMS plant was the first commercial application of the two

Zinc production by leaching process - YouTube

Mar 27, 2018· Recovery Of Zinc By Leaching Process: Zinc extraction process involves Roast-leach -electrolysis. The zinc concentrate(ZnS) is received from various captive

Hydrometallurgical Treatment of a Zinc Concentrate by

Ferric ion, which is one of the most important oxidant used in leaching processes, in either sulphate or chloride media, can be used to leach zinc sulphide, according to the equation (Aydogan et al., 2005; Dutrizac et al., 2003): ZnS +2Fe 3+Zn 2++2Fe 2++S0(1)


The science of sulfide pressure leaching was advanced dramatically when the Cominco (now Teck) Trail plant built a pressure leach facility for zinc concentrates (1971). This plant was a medium temperature process where sulfides were oxidized at 150o C and approximately 1,400 kPa using oxygen. Its success

(PDF) Applications of NSC Pressure Leaching

On an industrial scale, the Sunshine mine in Idaho operated a nitric-sulfuric acid based pressure leaching (NSC) process on Cu-Ag concentrates, which transformed galena into lead sulfate (Anderson

Iron Control in Zinc Pressure Leach Processes

PROCESS CHEMISTRY . The zinc pressure leach process depends upon the following simple reactions in which zinc sulfide, pyrrhotite, or iron in sphalerite, galena, and chalcopyrite react with sulfuric acid and oxygen to produce metal sulfates and elemental sulfur. ZnS + H 2 SO 4 + 0.5O 2 > ZnSO 4 + H 2 O + S° FeS + H 2 SO 4 + 0.5O 2 > FeSO 4 + H 2 O + S°

US4004991A - Two-stage pressure leaching process for zinc

Direct pressure leaching of zinc and iron containing mineral sulphides in dilute H 2 SO 4 is carried out in a two-stage countercurrent process in which finely divided sulphides are leached in a...

Modeling the kinetics of the zinc pressure leaching

The results are promising, showing that the model can predict plant Zn extraction data to within an error of 1.5 %. The model is further verified through bench scale pressure leaching experiments where 94 % of the zinc is extracted within 90 minutes using a concentrate sample from the same industrial plant.

Operation of the Sherritt Zinc Pressure Leach Process at

The HBMS plant was the first commercial application of the two-stage zinc pressure leach process, which allows for 100% production of zinc by direct leaching, in the absence of roasters.

Iron control in zinc pressure leach processes | SpringerLink

The integration of Dynatecs zinc pressure leach process with existing roast-leach-electrowin plants employing various methods of iron rejection is briefly described in this article, along with the application of two-stage pressure leaching in stand-alone processes.

Selective Removal of Zinc from BOF Sludge by Leaching with

Nov 09, 2020· The zinc content of the leaching residue obtained after two leaching steps at 60 °C corresponded to a zinc leaching efficiency of approximately 72%. A single contact leaching experiment under the same conditions but L/S = 5 showed a zinc leaching efficiency of 66 wt%. From the obtained results, it appears that multiple contact leaching does not significantly boost the zinc leaching


Pressure leaching is a well established hydrometallurgical processing alternative for gold, nickel, PGE and base metal ores. SGS has been active in this area since 1985, developing flowsheets and running integrated pilot plants in support of bankable fe asibility studies.

US5336474A - Process for leaching of precious metals

A process is disclosed for the leaching of gold and silver from ores and ore concentrates through intimate contact of the ore or ore concentrate with an aqueous leach solution containing cyanide. The leach solution has a pH of 8 to 13. The leaching process takes place in the presence of an oxygen-releasing peroxo compound. The separation of the formed cyano complexes of gold and silver takes

Solvent extraction in the primary and secondary processing

the economic exploitation of complex ores that yield low upgrading recoveries, while hydrometallurgical processing of The process featured zinc SX using the zinc-selective bisbenzimidazole extraction, ZNX 50, developed by Zeneca (now Avecia). Zinc metal was by TR on pressure leach liquors using

Autoclave Technology - Hatch

Autoclaves are a preferred component of the process for many large-scale sulfidic refractory bodies, including such processes as Au-Ag pressure oxidation; Cu-Ag-Au pressure oxidation; Ni-Co pressure leach; Ni-Co-Cu concentrate pressure oxidative leach; and TiO 2 HCL pressure leach. To select the right, best process, mining companies need to

First Chalcopyrite Copper Concentrate Leaching using

the region and wanted to prove up the concept of sulphide copper leaching at a commercial scale using the Albion Process TM. A very cheap retrofit was undertaken on the existing oxide leach circuit and then fed a predominantly chalcopyrite/bornite concentrate (28-30% Cu).

Leaching Solution - an overview | ScienceDirect Topics

Oxidation leaching of the ores or concentrates in fluorosilicate acid in the Extramet process [41] enables highly efficient extraction of metals (100% of lead and silver, 9095% of copper and zinc). They may be separated by a simple procedure and extracted with a high

Pressure Leaching of EAF Dust with Sulphuric Acid

The results show a zinc leaching effi-ciency of between 32 and 76 % by using the autoclave leaching (2 hours, 270 °C, 2 M H 2 SO 4) and 53 to 79 % by using atmospheric leaching (4 hours, 70 °C

The Sherritt Two-Stage Zinc Pressure Leach Process with

An excess of zinc concentrate is used to accomplish acid neutralisation in the first stage of pressure leaching, and the residual concentrate in the first stage residue is treated with an excess of acid solution in the second stage of pressure leaching to yield high zinc extraction.

(PDF) Recovery of Germanium from Sulphate Solutions

Cementation of germanium from sulphate solution obtained after the leaching of GeIn dross using zinc dust was investigated. The composition of the examined solution was 5.15 Ge, 1.52 In, and 5.81