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Advances in Thickener Flocculant Delivery

机译：增稠剂絮凝剂输送方面的进展

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Feed slurries are typically flocculated in a thickener’s feedwell to increase the settling rate, underflowrndensity and overflow clarity. High molecular weight polymeric flocculants are normally used, butrnpresent a number of challenges in terms of make up, dilution, delivery and mixing with the feedrnslurry.rnVarious aspects of the flocculant dilution and delivery system have been studied with a combinationrnof flow visualisation and computational fluid dynamics (CFD). An open topped flocculantrndilution/mixing box has been developed to replace a conventional flocculant manifold, withrnimprovements to the mixing, fault diagnosis and ease of determining the flow split to the variousrndosing points. The addition points to the feedwell have also been studied, both in terms of where thernflocculant is added, and how. While conventional multi-hole spargers are effective in dispersingrnflocculant, they are prone to blocking and have been replaced by open-ended pipes. The requiredrndispersion is provided by an efficient mixing element placed in the dilution port. Adding thernflocculant into the feedwell dilution stream prior to mixing with the slurry also provides superdilutionrnof the flocculant that can further improve the flocculation process and reduce flocculantrnconsumption.
机译：进料浆液通常在增稠器的进料口中絮凝，以提高沉降速率，下溢密度和溢流清晰度。通常使用高分子量的高分子絮凝剂，但在组成，稀释，输送和与给料浆的混合方面提出了许多挑战。 （差价合约）。已经开发出一种敞开式顶部的絮凝剂稀释/混合箱来代替传统的絮凝剂歧管，从而改善了混合，故障诊断并且易于确定分流到各个计量点的流量。还已经在添加絮凝剂的位置和方式方面研究了进料口的添加点。尽管常规的多孔喷射器在分散絮凝剂方面是有效的，但它们易于堵塞，并已被开放式管道取代。所需的分散是通过放置在稀释口中的高效混合元件提供的。在与浆液混合之前将絮凝剂添加到进料井稀释流中还提供了絮凝剂的超稀释，这可以进一步改善絮凝过程并减少絮凝剂的消耗。

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  • 会议地点 Perth(AU)
  • 作者

    A R Heath; I Arbuthnot;

  • 作者单位

    Thickeners, Outotec, 40 Kings Park Road, West Perth WA 6005.Email: alex.heath@outotec.com;

    Technology Development, Outotec, 40 Kings Park Road, West Perth WA 6005.Email: ian.arbuthnot@outotec.com;

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