当前位置: X-MOL 学术Powder Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Improved water recovery: A review of clay-rich tailings and saline water interactions
Powder Technology ( IF 5.2 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.powtec.2020.01.039
Di Liu , Mansour Edraki , Phillip Fawell , Luke Berry

Abstract The presence of clays can make dewatering of tailings from mineral processing challenging. This review focuses on the interaction of clays in tailings under different conditions, including the impact of high salinity. The surface chemistry and aggregation behaviour of clays in suspension are first discussed, and this is then extended to clay aggregation responses during polymer-induced flocculation, with a view to developing an understanding of how flocculant properties and applied shear can be optimised to enhance dewatering processes. There is increasing interest in polymer dosing to high solids tailings streams to enhance dewatering on deposition, and the demands for this process are contrasted against those for conventional flocculation at lower feed solid concentrations. The review concludes by highlighting a number of research challenges, which include that: (i) aggregate structures from polymer-assisted flocculation that are optimal for settling cannot also be assumed to be so for sediment consolidation; (ii) there is scope for reducing longer-term tailings impacts by choosing novel processing routes in the flowsheet design phase, but this requires insights on how tailings may behave after such processing at a much earlier stage; and (iii) most flocculation studies suffer from inconsistent, ill-defined or inappropriate conditions during the preparative stages, which prevent definitive conclusions being drawn on how high salinity impacts upon tailings flocculation, despite evidence that it can change aggregate density.

中文翻译:

提高水回收率:对富含粘土的尾矿和咸水相互作用的回顾

摘要 粘土的存在会使矿物加工尾矿的脱水变得困难。本综述重点关注不同条件下尾矿中粘土的相互作用,包括高盐度的影响。首先讨论悬浮粘土的表面化学和聚集行为,然后将其扩展到聚合物诱导絮凝过程中的粘土聚集响应,以了解如何优化絮凝剂特性和施加的剪切以增强脱水过程. 对高固体尾矿流中加入聚合物以增强沉积脱水的兴趣越来越大,并且对这种工艺的需求与在较低进料固体浓度下常规絮凝的需求形成对比。该评论最后强调了一些研究挑战,其中包括:(i) 聚合物辅助絮凝的集料结构对于沉降是最佳的,但不能假设也适用于沉积物固结;(ii) 通过在流程设计阶段选择新的加工路线,有减少长期尾矿影响的空间,但这需要在更早的阶段了解尾矿在这种加工后可能会如何表现;(iii) 大多数絮凝研究在准备阶段都存在不一致、不明确或不适当的条件,这阻碍了就高盐度对尾矿絮凝的影响得出明确的结论,尽管有证据表明它会改变聚集密度。(i) 聚合物辅助絮凝的集料结构最适合沉降,也不能假定为沉积物固结;(ii) 通过在流程设计阶段选择新的加工路线,有减少长期尾矿影响的空间,但这需要在更早的阶段了解尾矿在这种加工后可能会如何表现;(iii) 大多数絮凝研究在准备阶段都存在不一致、不明确或不适当的条件,这阻碍了就高盐度对尾矿絮凝的影响得出明确的结论,尽管有证据表明它会改变聚集密度。(i) 聚合物辅助絮凝的集料结构最适合沉降,也不能假定为沉积物固结;(ii) 通过在流程设计阶段选择新的加工路线,有减少长期尾矿影响的空间,但这需要在更早的阶段了解尾矿在这种加工后可能会如何表现;(iii) 大多数絮凝研究在准备阶段都存在不一致、不明确或不适当的条件,这阻碍了就高盐度对尾矿絮凝的影响得出明确的结论,尽管有证据表明它会改变聚集密度。(ii) 通过在流程设计阶段选择新的加工路线,有减少长期尾矿影响的空间,但这需要在更早的阶段了解尾矿在这种加工后可能会如何表现;(iii) 大多数絮凝研究在准备阶段都存在不一致、不明确或不适当的条件,这阻碍了就高盐度对尾矿絮凝的影响得出明确的结论,尽管有证据表明它会改变聚集密度。(ii) 通过在流程设计阶段选择新的加工路线,有减少长期尾矿影响的空间,但这需要在更早的阶段了解尾矿在这种加工后可能会如何表现;(iii) 大多数絮凝研究在准备阶段都存在不一致、不明确或不适当的条件,这阻碍了就高盐度对尾矿絮凝的影响得出明确的结论,尽管有证据表明它会改变聚集密度。
更新日期:2020-03-01
down
wechat
bug