摘要
采用"打浆水洗除Cr(Ⅵ)—电渗析除Cr(Ⅵ)—碱浸提铝—碳酸化分解法精制Al_2O_3"的新工艺处理含铬铝泥(以下简称铝泥),并回收Al_2O_3。实验结果表明:铝泥在70℃下经3次打浆水洗后,w(Na_2CrO_4)(以干铝泥计)降至5.0%;采用电渗析除Cr(Ⅵ)工艺可有效去除铝泥中以结合态和结晶态形式存在的Na_2CrO_4,在55 V直流电压下电渗析6h后铝泥中的w(Na_2CrO_4)降至0.98%;在碱浸温度为100℃、碱浸时间为3 h、NaOH质量浓度为150 g/L的优化碱浸条件下,铝浸出率(以Al_2O_3计)高达90.0%;经3次碳酸化分解处理后,Al_2O_3产品的纯度达98.65%,满足GB/T 24487-2009《氧化铝》中的一级标准,Al_2O_3回收率为96.37%。
The chromium-containing aluminum residue was treated to recover A12O3 by a new process of beating and water-washing for Cr （VI） removal-electrodialysis for further Cr （VI） removal-alkali leaching for aluminum removal- carbonation decomposition for A12O3 refinement. The experimental results show that： After beating and water-washing for 3 times at 70℃, w （Na2CrO4） （based on dried aluminum residue）of the residue can be reduced to 5.0%; The binding state and crystalline state Na2CrO4 in the residue can be effectively removed by electrodialysis, and w （Na2CrO4） of the residue can be reduced to 0.98% in 55 V DC voltage after electrodialysis for 6 h; Under the optimum alkali leaching conditions of alkali leaching temperature 100 ℃, alkali leaching time 3 h and NaOH mass concentration 150 g/L, the leaching rate of aluminum （calculate by A1203） is up to 90.0%; After 3 times of carbonation decomposition, the purity of A1203 product reaches 98.65%, which meets the first grade standard of GB/T 24487-2009, and the recovery rate ofA1203 is 96.37%.
出处
《化工环保》
CAS
CSCD
北大核心
2016年第1期101-105,共5页
Environmental Protection of Chemical Industry
关键词
含铬铝泥
除铬
电渗析
铝浸出
碳酸化分解
chromium-containing aluminum residue
chromium removal
electrodialysis
aluminum leaching
carbonation decomposition
