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• W2023651739 abstract "The characteristics of ferromanganese concretion samples of various morpho-chemistries at elevated temperatures have been investigated. These concretions have four unique physical properties such as high porosity, large surface area, high water content and ultrafine particle size. Dehydration of these samples around 150°C strengthens oxides and silicates and the minerals become more crystalline. δ-MnO2 and todorokite form the predominant manganese mineral phases of which the latter collapses on heating at 120°C. Crystalline phases of iron mineral appear only around 500 °C calcination. Because of the possible existence of non-crystalline hydrated ions, either as independent phase or as interlayer, within silicate minerals, these concretions lose weight continuously upon heating even above 800°C. At higher temperature the higher oxides of manganese and iron phases reduce to their lower oxides and quartz gets adsorbed into the manganese/iron phase. The BET surface areas of all the samples show a gradual increase up to 300–400°C followed by a sharp fall until 600°C and ultimately reduce to zero at 800°C calcination. Variation in water content and surface area, DTA-TG and XRD patterns between the two major ferromanganese concretions, viz. nodule and crust types, attest to a difference in their environment of deposition in the Indian Ocean basin." @default.
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• W2023651739 date "1989-06-01" @default.
• W2023651739 modified "2023-09-26" @default.
• W2023651739 title "Characteristics of marine ferromanganese concretions at elevated temperature" @default.
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• W2023651739 doi "https://doi.org/10.1016/0040-6031(89)85124-x" @default.
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