• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Controlled oxidative precipitation of manganese from an industrial zinc sulphate solution using a sulphur dioxide and oxygen gas mixture.
【24h】

Controlled oxidative precipitation of manganese from an industrial zinc sulphate solution using a sulphur dioxide and oxygen gas mixture.

机译：使用二氧化硫和氧气的混合物，可控制从工业硫酸锌溶液中锰的氧化沉淀。

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 purpose of the present work was to remove selectively manganese from a neutral leach zinc-rich solution at 80°C using the gas mixture of sulphur dioxide (SO2) and oxygen (O2) as oxidizing agent. In order to determine the optimum conditions for manganese removal using SO 2/O2, several semi-batch experiments were performed, where the effects of pH, ORP, SO2/O2 ratio, mixing intensity, etc. were investigated. Results of these tests showed that SO2/O 2 was a fast and effective oxidant for removing manganese down to ppm level provided that the appropriate reactor design, agitation and SO 2/O2 ratio were employed. In an attempt to improve the precipitate's characteristics, e.g. crystallinity and solid/liquid separation, a new technique called Step-Wise Oxidative Precipitation (S.W.O.P) was investigated using a two-reactor continuous circuit employing pH and ORP control and precipitate recycling. These tests revealed that a birnessite-like phase with general formula (Na0.7Ca0.3)Mn7O14•2.8H 2O was produced with co-precipitation of a significant amount of zinc apparently via substitution. The applied technique (S.W.O.P combined with recycling) proved effective in producing dense particles but not on lowering zinc losses. The biggest advantage of this novel oxidation technique was the total elimination of scaling. (Abstract shortened by UMI.)
机译：本工作的目的是使用二氧化硫（SO2）和氧气（O2）的气体混合物作为氧化剂，在80°C下从中性浸出富锌溶液中选择性除去锰。为了确定使用SO 2 / O2去除锰的最佳条件，进行了几次半分批实验，研究了pH，ORP，SO2 / O2比，混合强度等的影响。这些测试的结果表明，只要采用适当的反应器设计，搅拌和SO 2 / O2比，SO2 / O 2是一种快速有效的氧化剂，可去除低至ppm级的锰。为了改善沉淀物的特性，例如结晶度和固/液分离，使用两反应器连续回路，采用pH和ORP控制并进行沉淀物回收，研究了一种称为逐步氧化沉淀法（S.W.O.P）的新技术。这些测试表明，通过取代共沉淀大量锌，可制得通式（Na0.7Ca0.3）Mn7O14•2.8H 2O的水钠锰矿状相。事实证明，所应用的技术（S.W.O.P与回收利用相结合）可有效地生产致密颗粒，但不能降低锌的损失。这种新颖的氧化技术的最大优点是完全消除了结垢。 （摘要由UMI缩短。）

著录项

  • 作者

    Menard, Vincent.;

  • 作者单位

    McGill University (Canada).;

  • 授予单位 McGill University (Canada).;
  • 学科 Engineering Metallurgy.
  • 学位 M.Eng.
  • 年度 2005
  • 页码 102 p.
  • 总页数 102
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金工业;
  • 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