公开(公告)号：US09174852B2

公开(公告)日：2015-11-03

申请号：US13662964

申请日：2012-10-29

Applicant: NALCO COMPANY

Inventor： Ryan Chester ,  Jing Wang ,  John D Kildea

IPC: B01D37/03 ,  B01D37/04 ,  B01D21/01 ,  C01F7/14 ,  C01F7/06 ,  C01F7/47

CPC classification number: C01F7/145 ,  B01D21/01 ,  B01D37/03 ,  B01D37/04 ,  C01F7/0653 ,  C01F7/148 ,  C01F7/47

Abstract: The invention provides methods and compositions for improving the production of alumina trihydrate. The invention involves adding one or more cross-linked polysaccharides to a filter used to separate solids from liquid in the Bayer process. The one or more polysaccharides can be a cross-linked polysaccharide (such as cross-linked dextran or cross-linked dihydroxypropyl cellulose). The cross-linked polysaccharides can impart a number of advantages including greater flow rate and lower residual moisture in the resulting cake.

Abstract translation: 本发明提供了改善三水合氧化铝生产的方法和组合物。 本发明涉及将一种或多种交联多糖加入到用于在拜耳法中从液体中分离固体的过滤器。 一种或多种多糖可以是交联的多糖（例如交联的葡聚糖或交联的二羟丙基纤维素）。 交联的多糖可以赋予所得到的蛋糕中许多优点，包括更大的流速和更低的残留水分。

公开(公告)号：US09199855B2

公开(公告)日：2015-12-01

申请号：US13729744

申请日：2012-12-28

Applicant: NALCO COMPANY

Inventor： Carl Urbani ,  John D Kildea ,  Ryan Chester ,  Jing Wang

IPC: B01D37/03 ,  B01D37/04 ,  B01D21/01 ,  C01F7/14 ,  C01F7/06 ,  C01F7/47

CPC classification number: C01F7/0653 ,  B01D21/01 ,  B01D37/03 ,  B01D37/04 ,  C01F7/145 ,  C01F7/148 ,  C01F7/47

Abstract: The invention provides methods and compositions for improving the rheology of red mud removed from Bayer Process liquor. The method includes adding a flocculant and a cross-linked polysaccharide to the liquor. This combination separates the red mud from the liquor but also prevents the red mud from becoming too thick. By preventing excessive thickness, the method allows for the formation of extremely dense amounts of red mud even in primary settlers because the dense red mud can still flow. As a result a user can simultaneously enjoy both easy handling of red mud and also high recovery rates of valuable alumina and caustic from the red mud.

Abstract translation: 本发明提供用于改进从拜耳法溶液中除去的红泥的流变学的方法和组合物。 该方法包括向该液体中加入絮凝剂和交联多糖。 这种组合将红泥与酒分开，但也可防止红泥变得过厚。 通过防止过多的厚度，该方法即使在初级沉降器中也能形成非常密集的红泥，因为致密的红泥仍然可以流动。 因此，用户可以同时享受红泥的容易处理以及红泥中有价值的氧化铝和苛性碱的高回收率。