Extraction of Al and K salts from associated alunite tailings by an acid calcination-water leaching method

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• 作者：Wei Zhao^a ; ^b ; ^{wzhao@ipe.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Xi Yao^c ; Shuipin Zhong^a ; Yuanyuan Zhu^b ; Xuan Yang^b ; Linyun Yi^b ; Gang Li^b ; Jing Song^b ; Hongdong Yu^b ; Rengman Ruan^b ; Tao Qi^b ; ^{tqi@ipe.ac.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Alunite ; Intensification ; Leaching ; Crystallization
• 刊名：Journal of Cleaner Production
• 出版年：2015
• 出版时间：16 November 2015
• 年：2015
• 卷：107
• 期：Complete
• 页码：786-792
• 全文大小：1027 K

文摘

An acid calcination-water leaching method was developed to treat associated alunite tailings due to their high mass fraction of potassium and aluminum and simple crystalline phase composition. When the tailings first are calcined at 300 °C by 30% H₂SO₄ solution with the liquid–solid ratio of 2:1 and then leached at 80 °C aqueous solution with the liquid–solid ratio of 10:1, the leaching efficiency of aluminum and potassium is 87.2% and 85.3%, respectively. Based on the crystallochemistry principle, a multi-step crystallization method was devised to separate potassium and aluminum salts preliminarily, and aluminum sulfate and alum crystal with high purity were obtained.