含铀、锗褐煤综合利用的半工业试验

PILOT-PLANT-SCALE TEST ON COMPREHENSIVE UTILIZATION OF URANIUM- AND GERMANIUM-BEARING LIGNITE

本文提出了一种综合利用含铀、锗褐煤的工艺流程。半工业试验表明,为本流程专门设计制造的沸腾锅炉,在低于880℃下燃烧,可以达到高效燃尽,除产汽供热外,还能得到适合水治加工要求的煤灰。提出的铀锗共萃取、反萃取及分步沉淀分离技术,是处理富铀、锗煤灰水冶工艺的重大突破,具有简化流程、减少试剂消耗、成本低和金属回收率高等特点。该流程在技术上是可行的,经济上也是合理的。

This paper presents a process flowsheet for comprehensive utilizetion of uranium- and germanium-bearing lignite. The results of the pilot-plant-scale test showed that with the flu-idization furnace specially designed for the test,the satisfactory burn up efficiency could be obtained at the appropriate burning temperature kept<880 C, thereby the furnace was also used for generating steam and providing thermal energy. In addition, the attained lignite ashcould meet the requirements of hydrometallurgy. The technology of simultaneous solvent extracting and stripping U and Ge. and two-stage precipitation for separation of uranium from germanium was used in the process. This technology is a great breakthrough in the hy-drometallurgy of processing uranium- and germanium-bearing ash. It has the features of simpler technological process,less reagent consumption,lower operating cost and higher metal extraction rate. The presented process is technically feasible and economically rational.