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以适量Na2WO4·2H2O,HCl,NaCl和H2O为原料,从过饱和的角度对4.0％NaCl水溶液中WO3溶解度的超临界现象进行实验探讨.压力恒定在34 MPa,接近临界压力31.4MPa,温度变化于250～550℃之间,在快速淬火高压釜中进行实验.结果表明在临界区域内,WO3溶解度具有超临界现象,溶解度对温度、密度的变化反应敏感.本实验温、压条件与许多钨矿床成矿流体的温、压条件比较接近,超临界地质流体可能有助于揭示钨矿床的形成机制.
With the proper amount of Na2WO4 · 2H2O, HCl, NaCl and H2O as raw materials, the supercritical phenomenon of WO3 solubility in 4.0% NaCl aqueous solution was investigated from supersaturation point.The pressure was constant at 34 MPa, close to the critical pressure of 31.4 MPa, The results show that the solubility of WO3 has a supercritical phenomenon in the critical region and the solubility is sensitive to the changes of temperature and density.The temperature and pressure conditions of this experiment are similar to those of many tungsten deposits The temperature and pressure conditions of ore-forming fluids are relatively close, and the supercritical geological fluids may help reveal the formation mechanism of tungsten deposits.