四川稀土矿湿法冶炼中氟资源化问题研究

【作者】 刘咏；

【导师】 赵仕林； 龙炳清；

【作者基本信息】 四川师范大学 ， 环境科学与工程， 2001， 硕士

【摘要】 目前四川省稀土湿法冶炼工艺中存在着的工艺路线长，CeO₂的产率低（仅为64％）及化学材料耗量大而造成的酸、碱、盐污染和氟污染严重等问题，本文本文针对这些问题，结合氟资源化，提出一套氟碳铈矿湿法冶炼稀土的新工艺路线。该工艺路线中，把铈的分离与氟资源化相结合，大大减少了生产工艺步骤和化学材料的使用；降低了酸、碱、盐的污染负荷，并减除了氟污染。为四川稀土资源的科学开发和利用，提供了一种新工艺。 氟碳铈矿冶炼工艺过程中，氟含量的分析是控制生产过程及检验产品纯度的关键步骤，本文对氟的分析方法作了探讨。目前稀土生产时某些中间产品和废水中的氟的测定采用氟离子选择电极法及稀土产品中微、痕量氟的测定常采用氟试剂光度法和锆褪色法等，针对这些分析方法操作繁琐，条件苛刻，试剂耗量大等缺点，本文研究了采用低压离子色谱法分析稀土硫酸溶液中和CeO₂产品中的氟含量，此外，本文还用低压离子色谱连续测定稀土中的F和SO₄^2-离子的含量。实验结果表明，通过选择适当的样品预处理、方法及选择适宜的色谱分离条件，低压离子色谱法不仅可以准确地测定稀土硫酸介质中及CeO₂产品中的F含量，并可获得与氟试剂光度法和氟离子选择法一致的测定结果，而且还可以对CeO₂中的F^-和SO₄^2-含量进行同时测定。其加标回收率均在90％以上，检出限均小于0.01mg/L。为稀土生产厂家及各相关监测部门提供了一种新的测氟方法。更多还原

【Abstract】 The Study on the Question about Turning Floury into Resources from the Rare Earth Hydro-Smelting in SiChuan According to the problem in the prevailing rare earth hydro-smelting process in SiChuan province that the low recovery of CeO2, the serious acids base salt and floury pollution caused by using much of chemical material. We put forward a new technology route of the rare earth mine containing floury carbon and cerium hydro-smelting in order to make floury into resources . In this technology , it combined the separation of cerium with turning floury into resource . this reduced the process procedure and the use of chemical material . It also decreased the pollution load of the acid base and salt and lowered the pollution of floury . It supplied a new technology for the scientific utilization of the rare earth resource in SiChuan province. In the rare earth hydro-smelting process, it is important that the determination of floury from the producing process and the product . In this paper, we also studied on the analysis methods of floury from the rare earth hydro-smelting process . We used the low press ion chromatograph(LPIC) to determine the floury in the solution containing sulfate acid and in the CeO2 product and get the same result determined by spectrophotometric method and the floury ion selective electrode . We also simultaneous determined the Fand S042 in the CeO2 product by low press ion chromatography . The recovery was over 90% . The detection limit of Fand 8042 was below 0.1mg/i. It has provided a new method of analysis floury for the rare earth hydro-smeiting film and the relative analysis department.更多还原