Sorption properties of manganese ores

Abstract

Sorption properties of manganese ores to arsenic compounds in aqueous media are examined on the ore samples extracted from three Siberian deposits. The relation between sorption activity of manganese ores and medium pH, sorbent consumption, manganese content in the ore, and a manganese ore preparation process is established. Sorption properties in combination with earlier found oxidizing properties substantially expand the scope of integrated application of manganese ores.The applicability of manganese ores as catalysts to oxidation of bivalent manganese and iron ions in aqueous media is reported in [1,2]. It is found that natural and modified carbonate manganese ores exhibit catalytical properties in the iron and manganese ion oxidation process, the catalytical capacity tends upward with increase in manganese content in ore. The researchers were the first who discovered high catalytical properties of natural oxidized mineral psilomelane. The effect of catalytical oxidation of arsenites to arsenates was established at contact with psilomelane surface in the filtration process [3]. The application of psilomelane as a catalytical and filtration charge does not involve any chemical treatment of the matrix carrier and regeneration of its properties in the course of its exploitation.The present studies aim at investigation into sorption properties of differing-in-genesis manganese ores toward arsenic compounds in aqueous media.Manganese ores from three Siberian deposits: Usinsky, Porozhinsky and Durnovsky were selected as research ore samples. Usinsky carbonate ore types differing in mineral composition and manganese content are rhodochrosite, manganocalcite, silica-carbonate, and carbonate-silica ores. Oxidized ores, originated in the weathered primary ore crust, are presented by psilomelane, vernadite pyrolusite mineral types. Porozhinsky deposit is distinguished for oxidized and carbonate ores, main oxidized ore minerals are pyrolusite, manganite, psilomelane, and the carbonate ore is rhodochrosite. The mineral composition of Durnovsky ore is complicated with dominating psilomelane content along with pirolusite, braunite and manganite [4].The study ore samples were washed with water to remove sand-clay components, were then dried and ground down to 0.5-3.0 mm. The prepared samples were ranked as primary test samples.The samples of Usinsky and Porozhinsky ores were thermally treated at t = 600ºC to decompose carbonates. Psilomelan from the Durnovsky deposit was processed at the magnetic separation circuit. The data of X-ray-fluorescent analysis of primary and prepared ore samples are presented in the Table. The manganese content in the Durnovsky ore sample was increased from 16.36% up to 36.53% after the magnetic separation. The higher iron content is not considered as a negative factor in solving the research problem, because iron compounds are also helpful to remove arsenic from aqueous media. The thermal treatment of Porozhinsky and Usinsky manganese ores did not substantially alter elemental composition of test ...

Justification and development of innovative technologies for integrated processing of complex ore and mine waste

“…In 2000-2014 manganese ores of three deposits in Siberia: Durnovsky, Porozhinsky and Usinsky deposits were analyzed [25]. The base mineral of Durnovsky ore is psilomelane, and pyrolusite, manganite, kriptomelane, etc.…”