高铝粉煤灰生产氧化铝过程中镓提取工艺研究

Research on recovery of gallium in the alumina production process from high-alumina coal fly ash

摘要:

鉴于粉煤灰潜在的应用价值，粉煤灰循环再利用为兼顾经济和环保效益提供了绝佳的机会。本文全面的阐述了从预脱硅碱石灰烧结法生产氧化铝过程中提取镓的生产工艺。采用螯合离子交换树脂从铝浓度较高的种分母液中选择性分离低含量的镓，并对吸附数据进行了玻尔兹曼分布拟合及分析。文中还对工艺中孔蚀问题和玻璃鳞片的防腐性能进行了研究。

Abstract:

Recycling coal fly ash provides the perfect opportunity to achieve the significant economic and environmental benefits because of the vast number of potential applications. A production procedure is reported for the recovery of gallium from production of alumina from high-alumina coal fly ash with predesilication and lime-soda sinter combination process. The present paper gives a comprehensive description of the whole process. The low concentration of gallium in the spent liquor, along with the high concentration of aluminum, prompted the use of chelating ion exchangers as an alternative separation process. Gallium extraction studies were carried out using chelating ion exchangers. The experimental data were simulated and analyzed by Boltzmann distribution function. The paper also deals with the pitting corrosion of carbon steel as well as the studies carried out on the glass flake mortar resistant to corrosion.