摘要
江西某花岗岩型难浸硬岩沥青铀矿石,采用常规稀硫酸浸出时稀硫酸、双氧水药剂消耗大,浸出时间长,铀浸出率较低。为了提高该难浸硬岩铀矿的浸出率,通过采用稀土永磁内磁处理器对稀硫酸进行磁化处理后再进行浸出铀的对比试验。试验结果表明,在磁场强度为610kA/m、磁化时间45min、磨矿细度-0.295mm含量占88%、硫酸浓度为21%、H_(2)O_(2)用量为0.7%、浸出时间3.5h的条件下,获得了浸出矿渣含铀0.0092%、铀浸出率为91.24%的试验指标。与常规条件下铀浸出试验对比,铀浸出率提高了8.99个百分点,浸出矿渣含铀量减少0.0168个百分点,并且稀硫酸浓度降低2个百分点,H_(2)O_(2)用量减少0.1个百分点,浸出时间缩短0.5h。磁场强化硬岩铀矿浸出工艺为硬岩铀矿浸出技术提供了新的强化浸出方法,同时也为同类型矿山的浸出提供技术参考。
A granite-type refractory uranium ore in Jiangxi province is leached with dilute sulfuric acid,which consumes large amount of sulfuric acid and hydrogen peroxide,and results in long leaching time and low uranium leaching rate.In order to improve the leaching rate of the refractory hard rock uranium ore,the rare earth permanent magnet internal magnetic processor was used to magnetize the dilute sulfuric acid and then carry out the comparative test of leaching uranium.The results show that under the conditions of magnetic field intensity of 610 kA/m,magnetization time of 45 min,grinding fineness of 88%-0.295 mm,sulfuric acid concentration of 21%,H_(2)O_(2) dosage of 0.7%and leaching time of 3.5 h,the uranium content in leaching slag is 0.0092%and the uranium leaching rate is 91.24%.Compared with the conventional uranium leaching test,the uranium leaching rate is increased by 8.99 percentage points,the uranium content in leaching slag is reduced by 0.0168 percentage points,the dilute sulfuric acid concentration is reduced by 2 percentage points,H_(2)O_(2) consumption is reduced by 0.1 percentage points,and the leaching time is shortened by 0.5 h.The magnetic field enhanced hard rock uranium ore leaching process provides a new enhanced leaching method for hard rock uranium ore leaching technology,and also provides a technical reference for the leaching of the same type of mines.
作者
陈向
阳俊
廖德华
CHEN Xiang;YANG Jun;LIAO Dehua(Department of Resources and Enoironment,Hunan Nonferrous Metals of Vocational and Technical College,Zhuzhou 412006,Hunan,China)
出处
《有色金属（选矿部分）》
CAS
北大核心
2021年第3期45-49,共5页
Nonferrous Metals（Mineral Processing Section）
基金
湖南省教育厅科学研究项目(19C1375)。
关键词
铀矿
磁处理
酸浸
uranium ore
magnetic treatment
acid leaching
