“钙化-碳化”法处理高铁铝土矿过程中铝铁解离行为  

Dissociation Behavior of Al-Fe in the “CalcificationCarbonization” Process for High-Iron Bauxite

作　　者：张伟光[1] 张廷安[1] 吕国志[1] 郭芳芳[1] ZHANG Wei-guang;ZHANG Ting-an;LYU Guo-zhi;GUO Fang-fang(Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学多金属共生矿生态化利用教育部重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2018年第3期351-356,共6页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51504059);中央高校基本科研业务费专项资金资助项目(N162504016)

摘　　要：针对高铁一水硬铝石矿拜耳法工艺过程中铝铁难以解离的难题,提出"钙化-碳化-还原提铁"工艺方法,有效提取其中铝铁有价金属.利用纯物质合成铁铝水化石榴石相,研究其在"钙化-碳化-还原提铁"整个工艺过程中的转化行为,为含铁铝资源中铝铁的有效解离和综合回收提供理论基础.实验结果表明:在Na2O-Al2O3-Ca O-Si O2-Fe2O3-H2O体系中,铁铝水化石榴石相可在483~533 K的温度范围内生成,且其性质相对稳定.碳化过程铁铝水化石榴石相可全部分解,生成碳酸钙相、硅酸钙相、三氧化铁相以及少量的水化石榴石相.同时碳化渣经溶铝后,其中52.7%的氧化铝可被提取;尾渣经煤粉还原后其铁金属化率可达77.2%.Aiming at dissociation problem of Al-Fe in hydrometallurgical extraction process for high-iron diaspore bauxite,“calcification-carbonization-reducing iron”method was proposed for effectively extracting valuable metal Al and Fe.Andradite-grossular hydrogarnet was synthetized by pure material,and the transformation behavior in novel technology was investigated for effective dissociation and comprehensive recovery of Al-Fe from high-iron bauxite.The results showed that the andradite-grossular hydrogarnet is synthetized in the range of 483~533 K in Na 2O-Al 2O 3-CaO-SiO 2-Fe 2O 3-H 2O system,in which chemical property is relatively stable.In the carbonization process,andradite-grossular hydrogarnet is decomposed entirely,producing CaCO 3,Ca 2SiO 4,Fe 2O 3 and a little grossular hydrogarnet.Moreover,52.7%of Al 2O 3 is extracted in dissolving alumina process and 77.2%of Fe is reduced in the directly reducing iron process.

关 键 词：钙化-碳化法 高铁一水硬铝石矿 铁铝水化石榴石 铝铁解离 溶铝 

分 类 号：TF821[冶金工程—有色金属冶金]