This paper explores a new process to extract PGM's from low grade concentrate using a sequential stage heap leach process entailing heap bioleaching and high temperature cyanide leaching and evaluates the feasibility of implementing a carbon in pulp process to recover PGMs from the pregnant leach solution
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·In order to improve the chromate salts cleaner production technology a pressure leaching process for chromite ore in 50 wt% KOH solution was studied for the first time and the results were presented in this manuscript It was found out that the
·Abstract This study presents chemical mineralogical and leaching characterization of chromite ore processing residue COPR derived from the soda ash process which is currently replacing the lime based process in China the world s largest chromite processor Results indicated that while soda ash COPR had 8 500 mg/kg Cr VI 90% of that
·The kinetics investigation indicates that the leaching process is controlled by surface chemical reaction The activation energy of the chromite ore leaching process is kJ/mol and the reaction order with respect to oxygen partial pressure is determined as An empirical rate equation was derived to describe the pressure leaching
·For the process of sulfuric acid curing water leaching the leaching of chromium reached up to % under the optimum conditions of sulfuric acid curing raw tannery sewage sludge cured at room
·Leaching characteristics of chromium ore processing residue COPR for the long term simulating a 20 year leaching scenario were investigated using laboratory flow through column testing with
A process for treating chromite bearing ores to obtain useful mineral values especially platinum group metal therefrom wherein the ore is separated into magnetic and non magnetic fractions; the non magnetic fraction containing a substantial portion of the platinum group metals is concentrated and smelted to produce a metal layer containing platinum group metals; and the
·Minerals 2016 6 7 3 of 12 Fe2O3 Mg Fe Al 2O4 and others [22 23] According to the various technical procedures the non calcium roasting process can be divided into different technologies such
Chromium is mainly used for the production of stainless steel in electroplating as pigments and in leather and refractory industries The natural resource of chromium is the chromite ore which is a spinel Fe 2 Mg [Cr Al Fe 3 ] 2 O 4 and is often present with gangue minerals such chromium chemical extraction has been carried out with alkali and CaO
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