A study of the kinetics of reductive leaching of manganese oxide ore in aqueous methanol–sulphuric acid medium

Acid leaching of ash and coal: Time dependence and trace element occurrences

“…Mg and K are still important for sawmill residues, but many other elements contribute with Mn dominating. Momade and Momade (1999) presented a similar profile for Mn leaching from manganese oxide ore, as in Fig. 2.…”

Kinetic modelling of a solid–liquid reaction: reduction of ferric iron to ferrous iron with zinc sulphide

“…The solid-liquid reaction can occur at the surface of the solid, in the ÿlm around the solid or in the liquid bulk phase. Di erent steps, such as mass transfer, chemical reaction, and charge transfer, can determine the dissolution rate (Crundwell, 1987;Crundwell and Verbaan, 1987;Momade and Momade, 1999). The classical models used for solid-uid reactions are the shrinking particle and the shrinking core (product layer) models (Levenspiel, 1972).…”

Co-recovery of manganese from low-grade pyrolusite and vanadium from stone coal using fluidized roasting coupling technology

“…The process has many disadvantages: high energy consumption, long roasting time, insufficient heat and mass transfer, and easy sintering. The hydrometallurgical reduction proceeds mainly with the following reductants: reductive minerals, including pyrite (Kholmogorov et al, 2000), sphalerite (L, 2004), and galena (Long et al, 2010); organic reductive materials, including molasses (Lasheen et al, 2009;Su et al, 2008), methyl alcohol (Momade and Momade, 1999a;Momade and Momade, 1999b), sawdust (Hariprasad et al, 2007), cornstalk (Tian et al, 2010), and oxalic acid (Sahoo et al, 2001); and inorganic reductants, including sodium sulfite (Jianhua et al, 2007), iron powder (Bafghi et al, 2008), ferrous sulfate (Das et al, 1982), hydrogen peroxide (Do et al, 2009;El Hazek et al, 2006;Nayl et al, 2011), and sulfur dioxide (Grimanelis et al, 1992;Naik et al, 2000;Sun et al, 2011).…”