skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: An experimental study of the solubility of molybdenum in H 2O and KCl-H 2O solutions from 500 ºC to 800 ºC, and 150 to 300 MPa

Abstract

The solubility of molybdenum (Mo) was determined at temperatures from 500 °C to 800 °C and 150 to 300 MPa in KCl-H 2O and pure H 2O solutions in cold-seal experiments. The solutions were trapped as synthetic fluid inclusions in quartz at experimental conditions, and analyzed by laser ablation inductively coupled plasma mass spectrometry (LA ICPMS). Mo solubilities of 1.6 wt% in the case of KCl-bearing aqueous solutions and up to 0.8 wt% in pure H 2O were found. Mo solubility is temperature dependent, but not pressure dependent over the investigated range, and correlates positively with salinity (KCl concentration). Molar ratios of ~1 for Mo/Cl and Mo/K are derived based on our data. In combination with results of synchrotron X-ray absorption spectroscopy of individual fluid inclusions, it is suggested that Mo-oxo-chloride complexes are present at high salinity (>20 wt% KCl) and ion pairs at moderate to low salinity (<11 wt% KCl) in KCl-H 2O aqueous solutions. Similarly, in the pure H 2O experiments molybdic acid is the dominant species in aqueous solution. The results of these hydrothermal Mo experiments fit with earlier studies conducted at lower temperatures and indicate that high Mo concentrations can be transported in aqueous solutions. Therefore,more » the Mo concentration in aqueous fluids seems not to be the limiting factor for ore formation, whereas precipitation processes and the availability of sulfur appear to be the main controlling factors in the formation of molybdenite (MoS 2).« less

Authors:
;  [1]
  1. Australian National University
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE
OSTI Identifier:
1006572
Resource Type:
Journal Article
Journal Name:
Geochimica et Cosmochimica Acta
Additional Journal Information:
Journal Volume: 72; Journal Issue: 2008; Journal ID: ISSN 0016-7037
Publisher:
The Geochemical Society; The Meteoritical Society
Country of Publication:
United States
Language:
ENGLISH
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 58 GEOSCIENCES; MOLYBDENUM; SOLUBILITY; WATER; POTASSIUM CHLORIDES; MOLYBDENUM SULFIDES; AQUEOUS SOLUTIONS; PRESSURE RANGE MEGA PA 100-1000; TEMPERATURE RANGE 0400-1000 K

Citation Formats

Ulrich, Thomas, and Mavrogenes, John. An experimental study of the solubility of molybdenum in H2O and KCl-H2O solutions from 500 ºC to 800 ºC, and 150 to 300 MPa. United States: N. p., 2008. Web. doi:10.1016/j.gca.2008.02.014.
Ulrich, Thomas, & Mavrogenes, John. An experimental study of the solubility of molybdenum in H2O and KCl-H2O solutions from 500 ºC to 800 ºC, and 150 to 300 MPa. United States. doi:10.1016/j.gca.2008.02.014.
Ulrich, Thomas, and Mavrogenes, John. Tue . "An experimental study of the solubility of molybdenum in H2O and KCl-H2O solutions from 500 ºC to 800 ºC, and 150 to 300 MPa". United States. doi:10.1016/j.gca.2008.02.014.
@article{osti_1006572,
title = {An experimental study of the solubility of molybdenum in H2O and KCl-H2O solutions from 500 ºC to 800 ºC, and 150 to 300 MPa},
author = {Ulrich, Thomas and Mavrogenes, John},
abstractNote = {The solubility of molybdenum (Mo) was determined at temperatures from 500 °C to 800 °C and 150 to 300 MPa in KCl-H2O and pure H2O solutions in cold-seal experiments. The solutions were trapped as synthetic fluid inclusions in quartz at experimental conditions, and analyzed by laser ablation inductively coupled plasma mass spectrometry (LA ICPMS). Mo solubilities of 1.6 wt% in the case of KCl-bearing aqueous solutions and up to 0.8 wt% in pure H2O were found. Mo solubility is temperature dependent, but not pressure dependent over the investigated range, and correlates positively with salinity (KCl concentration). Molar ratios of ~1 for Mo/Cl and Mo/K are derived based on our data. In combination with results of synchrotron X-ray absorption spectroscopy of individual fluid inclusions, it is suggested that Mo-oxo-chloride complexes are present at high salinity (>20 wt% KCl) and ion pairs at moderate to low salinity (<11 wt% KCl) in KCl-H2O aqueous solutions. Similarly, in the pure H2O experiments molybdic acid is the dominant species in aqueous solution. The results of these hydrothermal Mo experiments fit with earlier studies conducted at lower temperatures and indicate that high Mo concentrations can be transported in aqueous solutions. Therefore, the Mo concentration in aqueous fluids seems not to be the limiting factor for ore formation, whereas precipitation processes and the availability of sulfur appear to be the main controlling factors in the formation of molybdenite (MoS2).},
doi = {10.1016/j.gca.2008.02.014},
journal = {Geochimica et Cosmochimica Acta},
issn = {0016-7037},
number = 2008,
volume = 72,
place = {United States},
year = {2008},
month = {4}
}