Leaching of molybdenite concentrate with hydrogen peroxide in sulfuric acid solution was investigated to determine the effects of reaction time, reaction temperature, H2O2 concentration, H2SO4 concentration, pulp density and rotation speed on molybdenum extraction and molybdenite dissolution kinetics, using the Taguchi method. From analysis of var...

Colemanite is one of the most important underground riches of Turkey, having approximately 60% of the world boron deposits, and it has a large portion in the deposits. In this study, chemical leaching and biological leaching methods were used for production of boric acid from colemanite (2CaO · 3B3O3 · 5H2O) (Emet-Kütahya, Turkey). Oxalic acid concentration, temperature, stirring time and solid...

In order to reduce CO2 emission, the sequestration using particulate steelmaking slag in water is world widely being studied through a Ca-carbonation method. As consequence, improved efficiency of Ca leaching from steelmaking-slag particles contributes significantly increasing amount fixed CO2. Therefore, this study, for purpose understanding particles, rate week acidic solution was analyzed by...

This paper describes a leaching-purifying-precipitation process to recover magnesium from serpentine acid-leaching solution and synthesize high purity Mg(OH)2 4MgCO3·Mg(OH)2·4H2O. Fe, Al, Cr in the leaching were removed using oxidation precipitation method with active MgO as precipitant H2O2 an oxidant. Ni, Co Mn by Na2S obtain pure MgSO4 solution. Mg2+ ions first precipitated NH3·H2O Mg(OH)2, ...

Processing of gold ores with high sulfide minerals is problematic as they consume cyanide and reduce gold leaching. Optimization of gold leaching and cyanide consumption requires a methodology to estimate the amount of exposed cyanicides, their leaching kinetics, and speciation of cyanide complexes that consume the free cyanide and compete with gold. In this paper, a physico-chemical approach i...

In this study the hydrometallurgical processing of BOF sludge in the sulphuric acid solutions under atmospheric pressure and temperatures up to 100 °C is investigated on a laboratory scale. The influence of sulphuric acid concentration, temperature, time and liquid to solid ratio (L:S) on the leaching process was studied. The main aim of this study was to determine optimal conditions when the m...

The bulk of the world's phosphate reserves is located in sedimentary horizons that contain appreciable amounts of carbonate. During beneficiation of phosphate rocks, huge amounts of oversize phosphate rocks are rejected from crushers. This reject also mostly contains low tricalcium phosphate and high carbonate content. In this study, experiments have been carried out to reduce/eliminate car...