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Surface precipitation of MgCO~3~ on MnCO~3~ in aqueous solution at 90°C by Leif Wiklund; Lars-Olof Öhman; Jan Lidén is a Engineering article available to read on EtoBox.

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Data presented in this work are used to suggest that after oxygen delignification, Mg(II) and Mn(II) are present in kraft pulps as carbonate solids, where the Mn(II)CO 3 (s) is coated by a layer of MgCO 3 (s). This can explain the role of Mg(II) as a redox stabiliser for Mn(II) in situations where hydroxide phases are thermodynamically unstable but where metal carbonates could form. The coating of MnCO 3 (s) by MgCO 3 (s) has been studied with aqueous Mg(II):Mn(II) molar ratios ranging from 1:3 to 31:1 and at a temperature of 90 ̊C. The formation of the various precipitates has been characterised by means of optical and energy dispersive SEM, x-ray powder diffractometry and xray photoelectron spectroscopy. To ascertain the inertness of the Mg(II)-coated Mn(II) carbonate particles, hydrogen peroxide stability tests were performed. The results showed that particles generated from Mg(II):Mn(II)-solutions of a molar ratio of 1 or above were significantly less active against the hydrogen peroxide in alkaline solutions. To prove that this mechanism also occurs under mill conditions, it is shown in the article that the corresponding type of particles can be precipitated from an oxygen-sta

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Author

Leif Wiklund; Lars-Olof Öhman; Jan Lidén

Publisher

Walter de Gruyter GmbH

Published

2001

Language

EN

Field

Engineering (Physical Sciences)