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1. 发明授权

US5492628A Process for reducing sludge accumulation in the hot water extraction process for oil sands 失效
标题翻译：在油砂热水提取过程中减少污泥堆积的方法
公开(公告)号：US5492628A
公开(公告)日：1996-02-20
申请号：US319000
申请日：1994-10-06
申请人： Robert Schutte
发明人： Robert Schutte
IPC分类号： B03B9/02 , B09B1/00 , C10G1/04 , C02F1/52
CPC分类号： B09B1/00 , B03B9/02 , C10G1/047
摘要： A dispersant, such as sodium silicate, is added to the process water of the hot water extraction process which recovers bitumen from oil sands. The dispersant disperses the ultrafine (less than 300 nm) particles, to reduce the formation of flocs and sludge in the tailings pond. The volume of the pond is such that the retention time of process water is sufficiently short (less than 6 weeks when using sodium silicate) to avoid reforming flocs from the dispersed ultrafines. The ultrafines content in the process water builds up as the water is repeatedly recycled from the pond to the extraction process. The ultrafines content stabilizes at a steady state concentration as some ultrafines are continuously removed from the process water when the tailings are delivered onto the "beach" of the pond and become trapped in the sand.
摘要翻译：将分散剂如硅酸钠加入到从油砂中回收沥青的热水提取过程的工艺水中。分散剂分散超细（小于300nm）颗粒，以减少尾矿池中絮凝物和污泥的形成。池塘的体积使得工艺水的停留时间足够短（使用硅酸钠时少于6周），以避免从分散的超细粉中重整絮凝物。随着水从池塘重复循环到提取过程，工艺中的超细含量积聚起来。超细含量稳定在稳态浓度，因为当尾矿物被运送到池塘的“海滩”上时，一些超细细菌从工艺水中被连续地除去并被困在沙子中。

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