Metall. Res. Technol.
Volume 111, Number 2, 2014
|Page(s)||95 - 105|
|Published online||14 May 2014|
The behavior of arsenic trioxide in non-ferrous extractive metallurgical processing
Department of Materials and Metallurgical Engineering, South
Dakota School of Mines and Technology, 501 East Saint Joseph Street, Rapid City, SD 57701-3995, US
2 Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, 135 South 1460 East, Room 412, William C. Browning Building, Salt Lake City, UT 84112-0114, US
3 Department of Metallurgical and Materials Engineering, Montana Tech of The University of Montana, 215 ELC Building, 1300 West Park Street, Butte, MT 59701-8997, US
Accepted: 7 April 2014
Study of the acid bake-leach process has shown potential advantages for the treatment of enargite (Cu3AsS4) concentrates. Among the most important advantages of the process is the transformation of enargite to water-soluble copper sulfate and highly soluble arsenic trioxide (arsenolite). Because arsenic is retained in the condensed phase during the baking, the vapor pressure of arsenic trioxide should be estimated at typical baking temperatures (e.g. 473 K). To that end, the vapor pressure of As4O6 (g) was estimated under the baking conditions based on published thermodynamic values. The vapor pressure of arsenolite at 473 K was found to be approximately 9.03 × 10-4 atm. Based on the linear regression analysis of the published vapor pressure values for arsenolite in the temperature range 366−579 K, the equation for the best fit line was found to be as follows, with a correlation coefficient of 0.9973:
logPArsenolite (atm) = (-5780.7)/(T (K))+9.16.
Available information on arsenic trioxide does not allow a definite conclusion regarding the arsenolite/claudetite transformation temperature and their exact melting points. However, the transition temperature has been reported to be in the wide range of 240−506 K in different references. Furthermore, the thermodynamic information concerning arsenolite/claudetite is sparse and at times not consistent. An effort has been made in this paper to compile the most reliable thermodynamic information for arsenic trioxide (arsenolite and claudetite).
Key words: acid bake / enargite / vapor pressure / arsenolite / claudetite / copper sulfate
© EDP Sciences 2014
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.