The microbiological leaching of a sulfide ore sample was investigated in shake flask experiments. The ore sample contained pyrite, pyrrhotite, pentlandite, sphalerite, and chalcopyrite as the main sulfide minerals. The tests were performed at eight different temperatures in the range of 4 to 37 degrees C. The primary data were used for rate constant calculations, based on kinetic equations unde...

Purpose – The purpose of this paper is to define the “fast evolving industry” (FEI) and its supply chain management (SCM) challenges. The authors review and structure the literature regarding integration strategies and implementation methods to develop a strategic decision-making framework for SCM in the FEI. Design/methodology/approach – The authors conduct a review of SCM literature, includin...

In this paper, gold leaching of a refractory sulfide concentrate by chloride–hypochlorite solution was investigated and effects of stirring speed, temperature and particle size on the leaching rate were reported. Experimental data for leaching rate of gold were analyzed with the shrinking–core model. Results were consistent with chemical reaction control mechanism in the first 1 h of leachin...

Platinum extraction from different secondary sources has been experimentally tested by many researchers. In this article, dissolution of platinum in aqua-regia solution from two types of spent catalysts (reforming and nitric acid production) was kinetically studied. A variety of kinetic models for heterogeneous solid-liquid reactions, including homogeneous diffusion model, shrinking core model,...

in this research work, the dissolution of chalcopyrite was investigated under atmospheric pressure, with sulfate media at low temperatures, in 30°c to 50°c. in the galvanic interaction between chalcopyrite and pyrite, pyrite is used as a leaching catalyst. effects of different parameters such as temperature, stirring speed, pyrite to chalcopyrite ratio, particle size, and solution potential wer...

Additives rich in Si and Al such as kaolin may be applied PF biomass boilers to fix alkali metals species that are more benign than the salts released combustion. In this study, models for reaction of gas-phase potassium with particles developed conditions appearing short residence times, high temperatures, small size additive particles. The between gaseous components has been modeled a shrinki...

Method To develop the National Drug Supply Chain Management Strategy (SCM) Strategy, BinFar formed a strategy team made up of key SCM partners and staff. A drug SCM situation analysis was undertaken in 14 units within the MOH, exploring SCM issues and concerns, including staff development. Based on the results of the situation analysis, a stakeholders meeting was held to determine the core subs...

The characterization and leaching mechanism of REEs from phosphogypsum (PG) in HCl was studied in-depth. contained the PG were 208 ppm, which Y, La, Ce, Nd four most abundant elements. modes occurrence rare earth elements (REEs) quantified using sequential chemical extraction (SCE) method. Among five REE species, metal oxide form accounted for largest proportion, followed by residual, organic m...