含硫-碳酸盐铀矿石中铀、黄铁矿综合浸出试验研究

Experiment Study on the Comprehensive Leaching of Uranium and Pyrite from a Sulfur-Carbonate Uranium Ore

为提升某含硫-碳酸盐铀矿石中铀的浸出率,同时控制黄铁矿的氧化浸出,分别采用加压及常压碱浸工艺对该铀矿石进行浸出,考察粒度、温度、碳酸钠用量、空气分压对黄铁矿和铀浸出率的影响。结果表明,当浸出温度、碱用量、氧气分压和粒度分别为150℃、16%、0.7 MPa和-74μm时,黄铁矿和铀浸出率分别为23.63%和81.61%,较常压碱浸过程铀浸出率提升7.27百分点,效果明显;黄铁矿浸出率提升控制在3.8百分点左右,未出现明显升高。其中,温度、碳酸钠用量、粒度对黄铁矿浸出影响最显著;空气分压、粒度对铀浸出影响最显著。

In order to improve the leaching rate of uranium in a sulfur-carbonate uranium ore and control the oxidation leaching rate of pyrite,the effect of particle size,temperature,sodium carbonate content and air partial pressure on the leaching rate of pyrite and uranium were investigated.The results showed that when the leaching temperature,alkali dosage,oxygen partial pressure and particle size were 150℃,16%,0.7 MPa and 74μm,respectively,the leaching rate of pyrite and uranium were 23.63%and 81.61%,respectively,which was higher than 7.27%in the process of alkali leaching at atmospheric pressure,and the leaching rate of pyrite was controlled at about 3.8%without obvious increase.Among them,temperature,amount of sodium carbonate and particle size have the most significant effect on pyrite leaching,and air partial pressure and particle size have the most significant effect on uranium leaching.