Experimental study on supercritical phenomena of WO3 solubility in NaCl-H2O system

被引：0
|
作者：
Qingjie Gong
Kuang Cen
Chongwen Yu
机构：
[1] China University of Geosciences,Institute of Mineral Resources
[2] Chinese Academy of Geological Sciences,undefined
来源：
Science in China Series D: Earth Sciences | 2003年 / 46卷
关键词：
supercritical phenomenon; critical region; tungsten; solubility; tungsten deposit;
D O I：
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中图分类号：
学科分类号：
摘要：
The solubility measurements of WO3 in NaCl-H2O system with 4.0% by weight salt were carried out to study the supercritical phenomena of solubility. These experiments were carried out using rapid-quench pressure vessels, with quantitative Na2WO4-2H2O, HCl, NaCl and H2O in Pt capsule to determine the solubility of WO3 from supersaturated solution. The pressure was kept at 34 MPa, which was near the critical pressure 31.4 MPa and the temperatures varied from 250°C to 550°C. The experimental results indicate that the solubility of WO3 has the features of supercritical phenomenon in critical region and is sensitive to the change of system temperature and solvent density. The temperature and pressure in this experiment are close to those of ore-forming fluids in many tungsten deposits, so the features of supercritical geofluids can be helpful to investigating the ore-forming mechanism of tungsten deposit.
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页码：664 / 671
页数：7
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