• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Direct Flotation of Niobium Oxide Minerals from Carbonatite Niobium Ores.
【24h】

Direct Flotation of Niobium Oxide Minerals from Carbonatite Niobium Ores.

机译：从碳酸盐铌矿中直接浮选氧化铌矿物。

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

Currently the recovery of niobium oxide minerals from carbonatite niobium ores relies on the use of non-selective cationic collectors. This leads to complicated process flowsheets involving multiple desliming and multiple reverse flotation stages, and low niobium recovery. In this research, anionic collectors that are capable of strong chemisorption on the niobium minerals were studied with the objective of directly floating the niobium oxide minerals from the carbonatite ores.;X-ray photoelectron spectroscopic (XPS) measurement results confirm that OHA (octyl hydroxamic acid) could chemisorb on pyrochlore surface while only physically adsorb on calcite, judging by the chemical shifts of electron binding energies in the elements in both OHA and the mineral surfaces. When hydroxamic acid was adsorbed on calcite surface, the binding energies of the N 1s electrons, at 400.3 eV, did not shift. However, after adsorption on pyrochlore, the N 1s binding energy peak split into two peaks, one at a binding energy of around 399 eV, representing chemically adsorbed OHA, the other at between 400 and 401 eV. The experimental data suggested a strong chemisorption of the OHA on pyrochlore surface in the form of a vertical head-on orientation of the OHA molecules so that the pyrochlore was strongly hydrophobized even at low OHA concentrations, followed by possibly randomly oriented physisorbed OHA molecules. On the other hand, OHA only physisorbed on calcite forming a horizontally oriented monolayer of OHA. The results explain the observed selectivity of hydroxamic acid in the flotation of niobium oxide minerals from carbonatite niobium ores.;In the flotation of both high purity minerals and Niobec ores, it was shown that the combination of hydroxamic acid and sodium metaphosphate was an effective reagent scheme for the direct flotation of niobium oxide from its ores. Batch flotation on the Niobec Mill Feed showed that over 95% of niobium oxide was recovered into a rougher concentrate that was less than 47% of the original feed mass. Preliminary cleaning tests showed that the reagent scheme could also be used to upgrade the rougher concentrate, although the depression of iron oxide minerals required further study.
机译：当前，从碳酸盐铌矿中回收氧化铌矿物依赖于非选择性阳离子收集器的使用。这导致复杂的工艺流程，涉及多个脱泥和多个反向浮选阶段，以及铌回收率低。在这项研究中，研究了能够在铌矿物上具有强化学吸附能力的阴离子捕收剂，目的是直接从碳酸盐岩矿石中漂浮铌氧化物矿物。X射线光电子能谱（XPS）测量结果证实了OHA（辛基异羟肟酸）根据OHA和矿物表面中元素中电子结合能的化学位移判断，方解石表面可以化学吸附而仅在方解石上物理吸附。当异羟肟酸被吸附在方解石表面时，N 1s电子的结合能在400.3 eV时没有移动。但是，在烧绿石上吸附后，N 1s的结合能峰分裂为两个峰，一个峰的结合能约为399 eV，代表了化学吸附的OHA，另一个峰在400至401 eV之间。实验数据表明OHA在烧绿石表面上的化学吸附强烈，呈OHA分子垂直朝上的方向，因此即使在低OHA浓度下，烧绿石也被强烈疏水化，随后可能是随机定向的物理吸附OHA分子。另一方面，OHA仅物理吸附在方解石上，形成了水平定向的OHA单层。结果解释了在焦碳酸盐铌矿浮选氧化铌矿物中观察到的异羟肟酸的选择性。在浮选高纯矿物和铌矿的浮选中，表明异羟肟酸和偏磷酸钠的组合是一种有效的试剂。从矿石中直接浮选氧化铌的方案。在Niobec磨机进料上的分批浮选表明，超过95％的氧化铌被回收到粗精矿中，其浓度小于原始进料质量的47％。初步的清洁测试表明，该试剂方案也可用于提纯粗选精矿，尽管对氧化铁矿物质的压制尚需进一步研究。

著录项

  • 作者

    Ni, Xiao.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 220 p.
  • 总页数 220
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 老年病学;
  • 关键词

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