公开(公告)号：US5946818A

公开(公告)日：1999-09-07

申请号：US652578

申请日：1996-09-23

申请人： Hamish Baxter ,  Andrew Nicolson Carruthers ,  Hans-Peter Elkjaer ,  Bryan Hiscox ,  Jens Fenger ,  Benny E. Raahauge ,  Jose Gil Fernandez Pulpeiro

发明人： Hamish Baxter ,  Andrew Nicolson Carruthers ,  Hans-Peter Elkjaer ,  Bryan Hiscox ,  Jens Fenger ,  Benny E. Raahauge ,  Jose Gil Fernandez Pulpeiro

IPC分类号： F26B3/12 ,  F26B17/10 ,  F26B7/00

CPC分类号： F26B3/12 ,  F26B17/102

摘要： A method and apparatus are disclosed for continuously drying, preferably with agglomeration and/or coating and sizing, and separating a solid product from a liquid feed material, especially bauxite slurry which passes through a very sticky phase during drying, without significant encrustation of the equipment used. The method comprises: spraying a liquid bearing solid material upwardly into a drying zone, feeding a drying gas into the drying zone from below The spraying liquid in substantially parallel flow, removing the mixture of the drying gas and entrained dried particles from the drying zone, separating the entrained dried particles from their mixture with the drying gas, returning the separated dried particles to the drying zone, and collecting the dried particles, characterized by arranging for the formation of a slower moving boundary layer within the feeding of the drying gas, through which boundary layer dried particles are allowed lo fall under gravity to be collected, and by collecting the dried particles continuously from below the spraying liquid.

摘要翻译： PCT No.PCT / GB94 / 02594 Sec。 371日期1996年9月23日 102（e）1996年9月23日PCT PCT 1994年11月25日PCT公布。 WO95 / 15470 PCT出版物 日期：1995年6月8日公开了用于连续干燥，优选具有附聚和/或涂层和施胶的方法和装置，并且将固体产物与液体进料材料，特别是在干燥期间通过非常粘相的铝土矿浆料分离，没有 所用设备的重大结算。 该方法包括：将液体承载的固体材料向上喷入干燥区，从下面将干燥气体从喷射液体基本上平行流入，从干燥区除去干燥气体和夹带的干燥颗粒的混合物， 将干燥后的干燥颗粒与干燥气体分离，将分离出的干燥颗粒返回到干燥区域，并收集干燥的颗粒，其特征在于，在干燥气体供给期间设置形成较慢的活动边界层，通过 允许边界层干燥的颗粒在重力作用下被收集，并通过从喷射液体的下方连续收集干燥的颗粒。

公开(公告)号：US4038039A

公开(公告)日：1977-07-26

申请号：US703005

申请日：1976-07-06

申请人： Andrew Nicolson Carruthers ,  John Edward Deutschman ,  Michael George Willis

发明人： Andrew Nicolson Carruthers ,  John Edward Deutschman ,  Michael George Willis

IPC分类号： C01F7/47 ,  C01F7/06 ,  B01D9/02

CPC分类号： C01F7/473

摘要： In order to control the sodium oxalate level in the liquor employed in the Bayer process for the production of alumina, a part of the spent liquor recovered from alumina trihydrate precipitation stage is concentrated by evaporation to render it supersaturated with respect to sodium oxalate. The thus concentrated liquor is then sprayed onto a packing in an enclosed space under conditions such that the supersaturation of the droplets at impact on the packing exceeds a critical supersaturation. The sprayed liquor deposits sodium oxalate on the packing and is recovered for recirculation to the process circuit.