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首页> 外文会议>National Seminar on "Application of Chemical Engineering for Utilisation of Natural Resources (CHEMINAR-2001)", Feb 16-18, 2001, Bhubaneswar >Recovery of Aluminium as Aluminium Hydroxide or Alumina from the Solution Containing AICl_3
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Recovery of Aluminium as Aluminium Hydroxide or Alumina from the Solution Containing AICl_3

机译：从含AICl_3的溶液中回收氢氧化铝或氧化铝形式的铝

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摘要

The waste liquor containing AlCl_3 along with free hydrochloric acid (HCl),chlorides of copper and iron in small quantities, is a major effluent from dye manufacturing units & Ethylbenzene manufacturing units. This effluent can be treated to produce gelatinous Aluminium hydroxide of high quality suitable for pharmaceutical grade. As per the process discussed here effluent is first treated with Ammoninium hydroxide to convert the salts of copper and iron in proper form so that they can be removed from the main streams and can be recovered subsequently. The new mechanism is postulated and accordingly the compound Nitro trialuminium hydroxide is assumed to be formed. The precipitates are separated by filtration. The subsequent treatment is by sodium hydroxide to produce sodium salt of Nitro trialuminium hydroxide. On heating the solution of this salt sodium aluminate solution is formed, which while isolating itself from other compounds also helps in settling the impurities. Supernatant solution of sodium aluminate is seperated and treated with dilute hydrochloric acid to obtain finally the white gelatinous precipitates of Aluminium hydroxide.The blue colored solution containing complex copper tetramine ion, obtained during first filtration, is given metallic treatment to make the solution colorless and is evaporated to obtain ammonium chloride.
机译：含有AlCl_3以及游离盐酸（HCl），少量铜和铁的氯化物的废液是染料制造单元和乙苯制造单元的主要废水。可以对该废水进行处理，以生产适用于医药级的高质量凝胶状氢氧化铝。按照此处讨论的方法，首先将废水用氢氧化铵处理，以适当形式转化铜和铁的盐，以便可以从主流中除去它们，然后进行回收。推测出新的机理，因此假定形成了化合物硝基三氢氧化铝。过滤分离出沉淀物。随后的处理是通过氢氧化钠产生氢氧化硝基三trial的钠盐。在加热时，形成该盐的铝酸钠溶液，该溶液在将自身与其他化合物隔离的同时也有助于沉降杂质。分离出铝酸钠的上清液，用稀盐酸处理，最终得到氢氧化铝的白色凝胶状沉淀物。在第一次过滤过程中得到的含有络合四胺铜离子的蓝色溶液经过金属处理，使溶液变为无色。蒸发得到氯化铵。

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