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Spouted bed electrowinning in the recovery of zinc from scrap galvanized steel

机译:从废料镀锌钢中升高锌的喷出床

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There is a growing need to process galvanized steel scrap from automobiles, etc., in order to remove the zinc coating that otherwise causes problems in remelting of the scrap in electric arc furnaces. One approach that has moved to the pilot plant stage is that of Metal Recovery Technologies, Inc., of East Chicago (MRI). That company leaches the zinc from the scrap with a sodium hydroxide solution. The leached and washed scrap can then be returned to the steel industry. What is left is a sodiumhydroxide/zincate solution which must be processed to recover the zinc and the NaOH. Presently, this is done by MRI using electrodeposition on planar electrodes at moderate current density and the resulting zinc is in the form of fine powder which is hard to process into, say, zinc for galvanizing. MRI has supported an investigation of a novel electrode, the spouted bed electrode (SBE), for zinc electrodeposition. I laboratory cells, zinc particles with low porosity have been grown up to 3mm in size.Microanalysis of the deposited zinc showed low level of impurities. DC energy consumption values were usually in the range of 2-2.5 kWh/kg which is well below the energy consumption of the existing cells (and of present-day cells for electrowinning fromacid sulfate electrolytes). These results were achieved at current densities (few thousand A/m{sup}2) that are much higher than possible with conventional electrodes. Discussion is provided of the scale-up of the cell to a commercial scale.
机译:越来越需要从汽车等处理镀锌钢废料,以便除去锌涂层,否则否则会导致电弧炉中的废料的问题。搬到试点工厂阶段的一种方法是East Chicago(MRI)的金属恢复技术,Inc。。该公司将锌从废料与氢氧化钠溶液浸出。然后可以将浸出和洗涤的废料返回钢铁工业。剩下的是钠盐/锌酸盐溶液,必须加工以回收锌和NaOH。目前,这是由MRI在适度电流密度的平面电极上使用电沉积,所得锌的形式是精细粉末的形式,这是难以加工的,说,用于镀锌。 MRI支持对锌电沉积的新型电极,喷射床电极(SBE)进行研究。 I实验室细胞,具有低孔隙率的锌颗粒已长达3mm尺寸。沉积的锌的分析显示出低水平的杂质。直流能量消耗值通常在2-2.5千瓦时/千克的范围内,其远低于现有细胞的能量消耗(以及用于从硫酸氢电解质的电解丁基电解质的当前细胞)。这些结果以常规电极的电流密度(几千A / m {sup} 2)实现,该结果远高于可能的电极。将细胞扩大的讨论提供给商业规模。

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