CHRISTOPHE DROUET, KATRINA L. PASS
The thermochemistry of jarosite-alunite and natrojarosite-natroalunite solid solutions was investigated. Members of these series were either coprecipitated or synthesized hydrothermally and were characterized by XRD, FTIR, electron microprobe analysis, ICP-MS, and thermal analysis. Partial alkali substitution and vacancies on the Fe/Al sites were observed in all cases, and the solids studied can be described by the general formula K1-x-yNay(H3O)xFezAlw(SO4)2(OH)6 –3(3-z-w)(H2O)3(3-z-w). A strong preferential incorporation of Fe over Al in the jarosite/alunite structure was observed. Heats of formation from the elements, /H9004H°f, were determined by high-temperature oxide melt solution calorimetry. The solid solutions deviate slightly from thermodynamic ideality by exhibiting positive enthalpies of mixing in the range 0 to /H1100111 kJ/mol. The heats of formation of the end members of both solid solutions were derived. These thermodynamic data should prove helpful to study, under given conditions, the partitioning of Fe and Al between the solids and aqueous solution.
@article{53b8a37f-d7f6-421b-9e07-37a9054864a1,
title={Thermochemistry of jarosite-alunite and natrojarosite-natroalunite solid solutions},
author={CHRISTOPHE DROUET and KATRINA L. PASS},
year={2003},
language={en}
}TY - JOUR TI - Thermochemistry of jarosite-alunite and natrojarosite-natroalunite solid solutions AU - CHRISTOPHE DROUET AU - KATRINA L. PASS PY - 2003 LA - en ER -
Chiranjib Kumar Gupta
This book provides a comprehensive overview of the field of chemical metallurgy, addressing both common and less common metals. The objective of the v
A. Ryan, E. Johanson
The design of process plants for feasibility studies must address several key objectives, including feasibility and constructibility, while focusing o
The Australasian Institute of Mining and Metallurgy
This conference, held in Perth, Western Australia, focuses on the latest advancements in metallurgical processing plant design and operational strateg
A. W. Fahrenwald
This document provides a systematic examination of the occurrence, properties, production, and metallurgical recovery of gold from its ores, with part
This paper addresses the challenge of assessing the feasibility of wind power plant projects at sites with insufficient or no local historic wind data