Abstract：Abstract: Temperature ， pressure and other physical conditions of ore-forming fluids affect the capacity
of uranium dissolution and precipitation ， which is of great significance in revealing the enrichment
mechanism of uranium in hydrothermal uranium deposits. The chemical analysis of trace elements and
physicochemical conditions simulation experiments were carried out with the samples from Shazijiang
uranium deposit. The temperature experiment with and without pressure constrain showed that under
the condition of saturated vapor pressure and 6.89 MPa ， the advantage uranium dissolved temperature
was 80 ℃ in 0.5% NaHCO 3 and 150 ℃ was the advantage dissolved temperature under 20 MPa which
is equivalent to about 702 to 800 m underground depth. Under 200 ℃ condition ， the uranium
dissolved capacity in 0.5% NaHCO 3 medium gradually reduce with the increase of the pressure. Itshows that the temperature fluctuation of uranium-bearing ore-forming fluid from crust with multiple
periods of magmatic activities is favorable for uranium enrichment and precipitation ， and the pressure
change during the decompression is not a direct factor for uranium enrichment and precipitation.
王文全，漆富成，林文姬，张玉燕，修晓茜. 碳酸氢钠介质铀溶解温压条件制约模拟实验研究[J]. 世界核地质科学, 2019, 36(03): 133-139.
WANG Wenquan,QI Fucheng,LIN Wenji,ZHANG Yuyan,XIU Xiaoqian . Experimental study on temperature and pressure constraints of
uranium dissolution in the sodium bicarbonate solution. , 2019, 36(03): 133-139.