Novel Dual Cycle Combined Aluminium Dross Stirrer and Pressing System

铝(Al)因其性质是仅次于铁的第二大使用金属(C KrammerAlHandbook 1999)。铝渣代表一次和二次铝生产的残渣。Droses根据其金属含量进行分类。白渣是一种含铝量较高的金属，由一次和二次铝冶炼厂生产。黑渣的金属含量较低，是在铝回收过程中产生的(第二产业)。白渣可能含有15%到70%的可回收金属铝&它由撇渣熔融的铝形成的细粉组成。黑渣通常含有15%或更少的铝和铝氧化物和炉渣的混合物。(HwangJ Y等2006).除铝金属外，熔渣还可能含有其他化合物，如Al203、AlN、Al4C3、MgF2、NaAlCl4、S102MgO。到2020年，全球铝总产量为6200万吨(其中近2600万吨来自回收)，到2020年将增至约9700万吨(3900万吨来自回收)(2013年欧洲铝回收工业组织)。据报道，全球每年约有400万吨白渣和100多万吨黑渣。&大约95%的这种材料被填埋(《矿物与材料杂志》2012年第5卷)。铝工业面临的问题是开发一种方法，从熔渣中回收尽可能多的熔融液体，同时仍处于热状态(830°C-900°C)。二次回收商在回收熔渣方面不再提供可接受的价值。只有大约40%的金属回收被转嫁给客户，这是现在的普遍做法。在远东和金砖四国，二次回收服务往往不可用。Altek已经确定了一种独特的双循环搅拌/压制工艺，可以显著提高现场铝的回收水平。

Aluminium (Al) due to its properties is the 2nd most used metal after iron (C KrammerAlHandbook 1999).Al dross represents a residue from primary & secondary Al production. Drosses are classifiedaccording to their metal contents. White dross is higher metal Al content & is produced fromprimary & secondary Al smelters. Black dross has a lower metal content & is generatedduring Al recycling (secondary industry sector). White dross may contain from 15% to 70%recoverable metallic Al & it comprises a fine powder from skimming the molten Al. Blackdross typically contains a 15% or less aluminium with a mixture of Al oxides & slag. (HwangJ Y et al 2006).Apart from Al metal, dross may also contain other chemical compounds eg Al203, AIN,Al4C3, MgF2, NaAlCl4, S102 MgO. With total global Al production at 62m tonnes (withclose to 26m tonnes from recycled) increase to around 97m tonnes (39m from recycled)(Organisation of European Al Recycling Industry 2013) by 2020.Approximately, up to 4 million tonnes of white dross & more than a million tonnes of blackdross are reported throughout the world each year, & around 95% of this material is landfilled(Journal of Minerals & Materials 2012 Vol 5).The problem for Al industry is to develop a means of recovering as much molten liquid fromAl from the dross whilst still in the hot form (830°C-900°C) on removal from the furnace.Secondary recyclers are no longer providing acceptable value in dross recovery. Only about40% of the metal recovery is passed on to the customer & is now common practice. In the FarEast & BRIC Countries, secondary recycling services are often not available. Altek haveidentified a unique dual cycle stirring/pressing process which could dramatically increase thelevel of Aluminium recovery on site.