Method for safely and efficiently producing sand-like alumina from aluminum ash

一种利用铝灰安全高效生产砂状氧化铝的方法

Abstract

本发明提供了一种利用铝灰安全高效生产砂状氧化铝的方法,包括以下步骤:1)向铝酸钠溶液中加入的铝灰与铝酸钠溶液反应后固液分离得到一段溶出液和铝灰渣,并综合利用氢气和氨气;2)向铝灰渣中加入碱与添加剂得到生料浆,以抑制氯、氟元素进入尾气中;3)将生料浆进行烧结得到熟料;4)将熟料加入至调整液中溶出得二段溶出浆液;5)一段溶出液、二段溶出浆液并入拜耳法溶出浆液稀释系统中随拜耳法系统生产砂状氧化铝。本发明安全处置了铝灰中氮、氟、氯和氢等有害元素,减少了拜耳法溶液中有机物浓度,高效经济回收其中铝组分;对铝灰而言,具有安全、高效、和低成本等特点;对拜耳法系统而言,增加了产量,净化了溶液,显著提高生产效率。
The invention provides a method for safely and efficiently producing sand-like alumina from aluminum ash. The method comprises the steps as follows: 1) aluminum ash is added to a sodium aluminate to react with the sodium aluminate solution, then solid-liquid separation is performed, a first-section digestion liquid and aluminum ash residues are obtained, and hydrogen and ammonia gas are comprehensively utilized; 2) alkali and an additive are added to the aluminum ash residues, raw slurry is obtained, and thus chlorine and fluorine elements are prevented from entering tail gas; 3) the raw slurry is sintered and clinker is obtained; 4) the clinker is added to an adjustment liquid for digestion, and second-section digestion slurry is obtained; 5) the first-section digestion liquid and the second-section digestion slurry are mixed in a Bayer process digestion slurry dilution system for production of the sand-like alumina by the Bayer process system. Nitrogen, fluorine, chlorine, hydrogen and other harmful elements in the aluminum ash are disposed safely, the concentration of organic matter in a Bayer process solution is decreased, and aluminum components are recovered efficiently and economically; for the aluminum ash, the method has the characteristics of safety, high efficiency, low cost and the like; for the Bayer process system, the yield is increased, the solution is purified, and the production efficiency is significantly improved.

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