公开(公告)号：US06905662B2

公开(公告)日：2005-06-14

申请号：US10147114

申请日：2002-05-16

申请人： Benny E. Raahauge

发明人： Benny E. Raahauge

IPC分类号： B01D53/72 ,  C01F7/02

CPC分类号： B01D53/72

摘要： Disclosed is a process for the elimination of volatile, foul-smelling organic compounds which are liberated in a gas suspension calciner process utilized to manufacture alumina. The process comprises recirculating captured alumina dust on which undesirable volatile organic compounds are adsorbed to a location in the manufacturing process (1) at or upstream (based on the path of the conveying gases) from the gas suspension calciner and (2) which is operating at a temperature of about 700 ° C. or higher. The adsorbed organic compounds are stripped off the alumina dust and are subsequently directed by process air into the gas suspension calciner furnace which is operating above 1000 ° C. under oxidizing conditions. Under such conditions the organic compounds are oxidized to H2O vapor and CO2. It is a preferred feature that the volatilized organic compounds are adsorbed on the alumina dust in a baghouse.

摘要翻译： 公开了一种消除在用于制造氧化铝的气体悬浮煅烧法中释放的挥发性，臭味有机化合物的方法。 该方法包括将不希望的挥发性有机化合物再循环到其上，在制造过程（1）中或在其上游（基于输送气体的路径）从气体悬浮煅烧器吸附不期望的挥发性有机化合物的位置和（2） 在约700℃或更高的温度下。 将吸附的有机化合物从氧化铝粉末中剥离出来，随后通过工艺空气引导到在氧化条件下运行在1000℃以上的气体悬浮煅烧炉中。 在这种条件下，有机化合物被氧化成H 2 O 2蒸气和CO 2。 优选的特征是挥发的有机化合物被吸附在袋式除尘器中的氧化铝粉尘上。

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：US4529579A

公开(公告)日：1985-07-16

申请号：US625776

申请日：1984-06-28

申请人： Benny E. Raahauge

发明人： Benny E. Raahauge

IPC分类号： C01F7/30 ,  C01F7/44 ,  C01F7/02

CPC分类号： C01F7/444 ,  C01F7/441 ,  C01P2006/12

摘要： This invention relates to a method for the production of anhydrous alumina having a desired .alpha.-conversion from alumina trihydrate.This method is directed to production of anhydrous alumina having a desired .alpha.-conversion from alumina trihydrate in which water is removed in a precalcining zone wherein the alumina trihydrate is heated to a temperature below 450.degree. C. Then, the precalcined dehydrated alumina is recrystallized to .alpha.-alumina in a reaction chamber by directing an oxygen containing gas to the reaction chamber, mixing and suspending the precalcined alumina and fuel in the oxygen containing gas and feeding the mixture to a combustion zone, followed by exothermal recrystallization of the alumina which is initiated by rapidly heating the precalcined alumina by burning the fuel in the oxygen containing gas in the hot combustion zone and withdrawing the recrystallized alumina from the top of the reaction chamber suspended in a combustion gas stream. The recrystallized alumina is then separated from the gas stream and cooled to produce anhydrous alumina having the desired content of .alpha.-conversion.

摘要翻译： 本发明涉及从三水合氧化铝生产具有所需的α-转化的无水氧化铝的方法。 该方法涉及从其中将氧化铝三水合物加热至低于450℃的预煅烧区中除去水的氧化铝三水合物制备具有所需α-转化的无水氧化铝。然后将预煅烧的脱水氧化铝重结晶至 通过将含氧气体引导到反应室，将预煅烧的氧化铝和燃料混合并悬浮在含氧气体中并将混合物进料到燃烧区域中，然后将起始的氧化铝进行放热重结晶，从而将反应室中的α-氧化铝 通过燃烧热燃烧区中的含氧气体中的燃料并将悬浮在燃烧气体流中的反应室顶部的再结晶氧化铝取出来快速加热预煅烧的氧化铝。 然后将再结晶的氧化铝与气流分离并冷却以产生具有所需含量的α-转化的无水氧化铝。