Crystalline hematite dissolved in amounts of several hundred milligrams in 2 min Crystalline goethite dissolved more slowly, but dissolved during the two or three 15 rain treatments normally given for iron oxide removal from soils and clays
Canadian Journal of Soil Science - NRC Research Press
A procedure for the removal of free iron from soils and clays by a single extraction at 50 °C with sodium hydrosulphite in a citrate buffer at pH 475 is described The effects of pH, temperature and reagent concentrations on the rate of removal of free iron from soils and hematite were .
The study was done by using natural 1:1 and 2:1 lamellar materials from clay Argentinean deposits Five natural samples (particle size lower than 10 μm) with different iron content, identified as C1 to C5, were selected for this study
Bleaching of kaolins and clays by chlorination of ,
Bleaching of kaolins and clays by chlorination of iron and titanium , Iron and titanium removal; Clay recovery; Kaolin 1 Introduction The term kaolin is used to refer to white clays whose principal mineral is kaolinite (Al 2Si 2O 5(OH) 4) Its particles are usually hexagonal and 005 to 10 μmin diameter (05 μm in average) Since this mineral is a ,
Microbially induced selective flocculation of hematite ,
Effective removal of iron oxides (hematite, for example) from kaolin clays (kaolinite) and of kaolin (kaolinite) from hematite thus is an important preliminary beneficiation step in the commercial use of the above mined raw materials Physicochemical methods including washing, acid dissolution, froth flotation, selective flocculation using .