Abstract Leaching titaniferous magnetite concentrate with alkali solution of high concentration under temperature and pressure was utilized to improve the grade iron in TiO 2 titanium tailings. The use contained 12.67% 54.01% Fe. thermodynamics possible reactions kinetics leaching process were analyzed. It found that decomposing FeTiO 3 NaOH aqueous could be carried out spontaneously reaction r...

In the process of comprehensive recovery and utilization discarded lithium-ion batteries via acid leaching, a large number NiS CoS mixed materials are produced. To improve metal rate, kinetics rate-determining step oxygen-rich pressurized leaching Ni Co were investigated. The results showed that rates greater than 99% under following conditions: sulfuric (leaching agent) concentration 95 g/L, l...

The following review is Part III of a series concerned with the direct hydrometallurgical processing nickel sulfide flotation concentrates. In first part this series, piloted leaching processes and commercial operations that employed were comprehensively reviewed. second laboratory investigations into pressure concentrates critically analyzed. nickeliferous at ambient are reviewed, challenges r...

Bioleaching is technologically feasible for extraction of manganese from low grade ores (containing manganese less than 35% by weight). The principle involves the non-enzymatic reduction of pyrolusite [Mn(IV) oxides] to +2 oxidation state by fungi with the production of metabolites such as oxalic acid and citric acid. In the present investigation, a fungal strain, Penicillium citrinum was isola...

Soil contamination by heavy metals is increasing. The biosorption process for removal of the heavy metal Cd(2+) from contaminated soil is chosen for this study due to its economy, commercial applications, and because it acts without destroying soil structure. The study is divided into four parts (1) soil leaching: the relationships between the soil leaching effect and agitation rates, solvent c...