堆浸铀尾渣中铀含量普遍高于0.02％,为了降低铀尾渣中的铀含量,采用频率为2450 MHz工业微波对铀尾渣进行了预处理,考察微波功率、辐照时间和尾渣质量对铀尾渣浸出行为的影响,探讨微波预处理提高铀尾渣中铀的浸出率的机理.结果表明:微波预处理的最佳条件为2.5kg铀尾渣在50 kW功率下辐照30 s,此时铀浸出率达到80.12％,相比未经预处理时的铀浸出率75.63％提高了4.49％.一定条件下的微波辐照促使铀尾渣中铀的价态和赋存形态向有利于浸出的方向转化,经30 kW功率微波辐照30 s后,相比对照组尾渣中U(Ⅳ)比例下降了17.78％;经20 kW功率微波辐照30 s后,相比对照组尾渣中弱酸提取态铀比例提高了15.55％.MLA分析表明,经微波预处理的尾渣中单体颗粒明显增加,铀的单体解离度提高有利于浸出.
参考文献
| [1] | 王志章.铀尾矿处置的实践和认识[J].铀矿冶,2009(01):22-25. |
| [2] | 王津;刘娟;陈永亨;齐剑英;朱莉;康明亮;李祥平;吴颖娟.铀尾矿粒径对浸滤中铀释放的影响研究[J].环境与健康杂志,2013(6):512-515. |
| [3] | 朱莉;王津;刘娟;陈永亨;李锦文.铀尾矿中铀、钍及部分金属的模拟淋浸实验初探[J].环境化学,2013(4):678-685. |
| [4] | 李江;刘亚洁;车江华;饶军.微生物柱浸法从铀矿石堆浸尾渣中回收铀的研究[J].有色金属（冶炼部分）,2012(11):37-40. |
| [5] | 陈伟;丁德馨;胡南;李峰.微波焙烧预处理难浸含金硫精矿[J].中国有色金属学报,2015(7):2000-2005. |
| [6] | Suoranta, Terhi;Zugazua, Oihane;Niemela, Matti;Peramaki, Paavo.Recovery of palladium, platinum, rhodium and ruthenium from catalyst materials using microwave-assisted leaching and cloud point extraction[J].Hydrometallurgy,2015:56-62. |
| [7] | R. Schmuhl;J.T. Smit;J.H. Marsh.The influence of microwave pre-treatment of the leach behaviour of disseminated sulphide ore[J].Hydrometallurgy,20113/4(3/4):157-164. |
| [8] | Isabel S.S. Pinto;Helena M.V.M. Soares.Microwave-assisted selective leaching of nickel from spent hydrodesulphurization catalyst: A comparative study between sulphuric and organic acids[J].Hydrometallurgy,2013:20-27. |
| [9] | Mohammad Al-Harahsheh;Sam Kingman.The influence of microwaves on the leaching of sphalerite in ferric chloride[J].Chemical Engineering and Processing,200710(10):883-888. |
| [10] | K. Hari Krishnan;D.B. Mohanty;K.D. Sharma.The effect of microwave irradiations on the leaching of zinc from bulk sulphide concentrates produced from Rampura-Agucha tailings[J].Hydrometallurgy,20073/4(3/4):332-336. |
| [11] | P.A. Olubambi.Influence of microwave pretreatment on the bioleaching behaviour of low-grade complex sulphide ores[J].Hydrometallurgy,20091/2(1/2):159-165. |
| [12] | P. A. OLUBAMBI;J. H. POTGIETER;S. NDLOVU;J. O. BORODE.Electrochemical studies on interplay of mineralogical variation and particle size on bioleaching low grade complex sulphide ores[J].中国有色金属学报（英文版）,2009(05):1312-1325. |
| [13] | P.A. Olubambi;J.H. Potgieter;J.Y. Hwang.Influence of microwave heating on the processing and dissolution behaviour of low-grade complex sulphide ores[J].Hydrometallurgy,20071/2(1/2):127-135. |
| [14] | B. Nanthakumar;C.A. Pickles;S. Kelebek.Microwave pretreatment of a double refractory gold ore[J].Minerals Engineering,200711(11):1109-1119. |
| [15] | 李广悦;刘玉龙;王永东;丁德馨.低品位铀矿石硫酸搅拌浸出与细菌搅拌浸出研究[J].核科学与工程,2009(1):92-96. |
| [16] | Vladimir Rizmanoski.The effect of microwave pretreatment on impact breakage of copper ore[J].Minerals Engineering,201114(14):1609-1618. |
| [17] | G. Scott;S.M. Bradshaw;J.J. Eksteen.The effect of microwave pretreatment on the liberation of a copper carbonatite ore after milling[J].International Journal of Mineral Processing,20084(4):121-128. |
| [18] | R.K. Amankwah;G. Ofori-Sarpong.Microwave heating of gold ores for enhanced grindability and cyanide amenability[J].Minerals Engineering,20116(6):541-544. |
| [19] | P. Kumar;B.K. Sahoo;S. De.Iron ore grindability improvement by microwave pre-treatment[J].Journal of industrial and engineering chemistry,20105(5):805-812. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%