• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Iron ore 2011 >The Dispersion of Kaolinite
【24h】

The Dispersion of Kaolinite

机译：高岭石的分散

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

Kaolinite is of very fi ne particle size in nature and thus its dispersion plays a key role in the successfulrnremoval of kaolinite in iron ore fl otation and selective fl occulation processes. As the most widelyrnused dispersant in the world, sodium silicate has been used as a standard dispersant for kaoliniternin the iron ore industry. However, the actual effect of sodium silicate on the colloid stability ofrnkaolinite particles and its dispersion mechanism remain unknown in the literature. In this work, therndispersion effect and dispersion mechanisms of some common inorganic and organic dispersants,rnincluding sodium silicate, polyphosphate and a low molecular weight polyacrylic acid, on kaoliniternparticles were systematically investigated through electrophoretic mobility and colloidal stabilityrnstudies over a wide pH range. It was found that sodium silicate-kaolinite interactions only takernplace in the neutral and acidic pH range, while polyacrylic acid and polyphosphate interact withrnkaolinite from pH 3 to 10.5. Consequently, sodium silicate only disperses kaolinite at neutral andrnacidic pH. In contrast, polyacrylic acid and polyphosphate disperse kaolinite from pH 3 to 10.5,rnwith strong dispersion effect observed at neutral and acidic pH. In the iron ore industry, selectivernfl occulation and reverse cationic fl otation, the most widely used fl otation route, are both conductedrnat pH 10 to 10.5. The results of the present study show that, at such high pH, polyacrylic acid andrnpolyphosphate are more effective dispersants of kaolinite, in comparison with sodium silicate.
机译：高岭石的性质非常细，因此其分散在铁矿石浮选和选择性絮凝过程中成功去除高岭石中起着关键作用。作为世界上使用最广泛的分散剂，硅酸钠已被用作铁矿石工业中高岭土的标准分散剂。但是，硅酸钠对高岭石颗粒胶体稳定性及其分散机理的实际影响在文献中仍然未知。在这项工作中，通过在宽pH范围内的电泳迁移率和胶体稳定性研究，系统地研究了一些常见的无机和有机分散剂，包括硅酸钠，聚磷酸盐和低分子量聚丙烯酸在高岭土颗粒上的分散作用和分散机理。发现硅酸钠-高岭石的相互作用仅在中性和酸性pH范围内发生，而聚丙烯酸和多磷酸盐在pH 3至10.5下与高岭土相互作用。因此，硅酸钠仅在中性和酸性pH下分散高岭石。相比之下，聚丙烯酸和多磷酸盐在3至10.5的pH范围内分散高岭石，在中性和酸性pH值下都具有很强的分散作用。在铁矿石工业中，最广泛使用的浮选途径是选择性絮凝和逆阳离子浮选，都是在pH 10至10.5的条件下进行的。本研究结果表明，与硅酸钠相比，在如此高的pH值下，聚丙烯酸和聚磷酸钠是高岭土更有效的分散剂。

著录项

  • 来源
    《Iron ore 2011》|2011年|p.471-474|共4页
  • 会议地点 Perth(AU)
  • 作者

    X Ma;

  • 作者单位

    CSIRO Process Science and Engineering, Box 312, Clayton Vic 3168. Email: mark.ma@csiro.au;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 铁矿石;
  • 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