• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Separation and Purification Technology >Wet-process phosphoric acid obtained from Kola apatite. Purification from sulphates, fluorine, and metals
【24h】

Wet-process phosphoric acid obtained from Kola apatite. Purification from sulphates, fluorine, and metals

机译：从可乐磷灰石获得的湿法磷酸。从硫酸盐，氟和金属中纯化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The purification of pre-concentrated up to 80 wt.% H_3PO_4 phosphoric acid (PA) obtained from Kola apatite in one of the Polish plants by the wet processing route was carried out by sulphate precipitation, desorptio of volatile components (SiF_4, HF) and liquid-liquid extraction method using 4-methyl-2-pentanone (MIBK). The experiment and carried out on a laboratory scale. The effects of the reagent grade Ca(H_2PO_4)_2 centre dot 2H_2O, CaHPO_4 centre dot 2H_2O, Ca_3(PO_4)_2, and technical grade calcium oxide, the molar ratio of Ca~(2+) to SO_4`(2-) (0.8-1.5), the temperature (343-363 K), and the duration of precipitation time (1800-7200 s) on the extent of purification from SO_4~(2-) were determined. The most efficient precipitant was CaHPO_4 centre dot 2H_2O. The precipitation using CaHPO_4 centre dot 2H_2O purified phosphoric acid from the initial SO_4`(2-) concentration (1.5-1.8%) to a level of 0.1-0.2 wt.%. The use of 100% excess of SiO_2 over the stoichiometric ratio (in relation to SiF_4), while air bubbling and very intensive stirring of the phosphoric acid at 403 K was carried out, allowed the fluorine concentration to decrease to a level below 0.005 wt.% of F. Purification from metals was carried out at room temperature using 1:1.22 mass ratio of PA to MIBK. The stripped phosphoric acid, with a concentration of about 50 wt.% of H_3PD_4 and 1.5 wt.% of MIBK, contained Fe and Al at a level of 0.01-0.005 wt.% each, Pb, Th < 1 ppm, Cr, Co, Ni < 0.1 ppm, As, Cd-not detected.
机译：通过硫酸盐沉淀，挥发性成分（SiF_4，HF）的硫酸盐沉淀和湿法处理，从湿法加工路线中的一种湿法纯化纯化自波兰一家工厂的可乐磷灰石中的预浓缩的最高80％的H_3PO_4磷酸（PA）。使用4-甲基-2-戊酮（MIBK）的液-液萃取方法。实验并在实验室规模上进行。试剂级Ca（H_2PO_4）_2中心点2H_2O，CaHPO_4中心点2H_2O，Ca_3（PO_4）_2和工业级氧化钙，Ca〜（2+）与SO_4`（2-）的摩尔比（确定了从SO_4〜（2-）提纯程度的温度（0.8-1.5），温度（343-363 K）和沉淀时间（1800-7200 s）。最有效的沉淀剂是CaHPO_4中心点2H_2O。使用CaHPO_4中心点2H_2O纯化的磷酸从最初的SO_4`（2-）浓度（1.5-1.8％）到0.1-0.2 wt。％的水平进行沉淀。使用超过化学计量比（相对于SiF_4）100％过量的SiO 2，同时进行鼓泡和在403 K下对磷酸进行非常强烈的搅拌，使氟浓度降低至低于0.005 wt。％的水平。在室温下使用PA与MIBK的质量比为1：1.22进行金属纯化。浓度为H_3PD_4约50 wt。％和MIBK为1.5 wt。％的汽提磷酸所含的Fe和Al含量分别为0.01-0.005 wt。％，Pb，Th <1 ppm，Cr，Co ，Ni ＜0.1ppm，As，Cd未检出。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号