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...

Abstract Aim Recycling of cocoa pod husks has potential to contribute mineral nutrition cocoa. Yet little is known the nutrient content and release patterns from husks. The potassium (K) rich are usually left in heaps plantations Africa. We aimed understand quantify K other nutrients under varying rainfall regimes assessed effects partial decomposition inundation on leaching rates. Methods incu...

Because tires contain approximately 1-2% zinc by weight, zinc leaching is an environmental concern associated with civil engineering applications of tire crumb rubber. An assessment of zinc leaching data from 14 studies in the published literature indicates that increasing zinc leaching is associated with lower pH and longer leaching times, but the data display a wide range of zinc concentratio...

Solvent extraction of copper from the copper leach solution obtained from the ammoniacal carbonate leaching of the Sarcheshmeh copper concentrate was carried out, and the performance of CP-150, LIX984N, and Kelex100 as well as the effects of different parameters involved were investigated. According to the results obtained, the extraction kinetics of all the three extractants was fast. High con...

Leaching is an unavoidable phenomenon associated with the pesticide applications. Leaching of pesticide does not only indicate the efficiency of a pesticide molecule, but also degree of the environmental contamination. Leaching is the process by which a pesticide molecule enters the soil-water ecosystem. Hence, to access the leaching behavior of a pesticide molecule, various models are used glo...

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,...

Leaching reactions in hydrochloric acid of several cathodic materials used lithium-ion batteries were investigated between 25 °C and 82 °C. The dissolution rate increased as follows: NMC811 (LiNi0.8Mn0.1Co0.1O2) > NMC622 (LiNi0.6Mn0.2Co0.2O2) NMC532 (LiNi0.5Mn0.3Co0.2O2) NMC111 (LiNi1/3Mn1/3Co1/3O2). lithium is faster than that for nickel, cobalt manganese. Data analysis demonstrated NMC always...