
2016年第2期
有色金属(冶炼部分)(http://ysyl.bgrimm.cn)
doi; 10.3969/j. issn. 1007-7545.2016. 02. 006
高硫铝土矿优化溶出工艺研究
刘龙,李军旗,陈朝轶,刘利,赵聪
(贵州大学材料与冶金学院,贵州省冶金工程与过程节能重点实验室,贵阳550025)摘要:采用正交试验研究高硫铝土矿的溶出性能,获得氧化铝与硫溶出率的回归方程,进而采用单因素试验方法,对高硫矿进行溶出工艺优化。结果表明,温度是影响矿石溶出性能的重要因素,但在低于 260℃时,硫溶出率的提升更为明显;氧化铝溶出率随昔碱浓度的提高而提高、硫溶出率呈下降趋势;时间与石灰量对矿石溶出性能的影响不明显。获得“低温高碱”的优化溶出工艺为:温度250℃、碱浓度 255g/L、时间70min、石灰添加量6%,氧化铝相对溶出率达到95%,硫溶出率低于26%,与回归方程的
预测结果吻合度较高。此工艺适于处理硫含量低于1.47%的高硫铝土矿。关键调:高硫铝土矿;优化工艺;正交试验;落出率
中图分类号:TF821
文献标志码:A
文章编号:1007-7545(2016)02-0023-05
·23·
StudyonOptimizationofDigestionProcessforHighSulfurBauxite
LIU Long,LI Jun-qi,CHEN Chao-yi,LIU Li,ZHAO Cong(Key Laboratory of Metallurgical Engineering and Process Energy Saving of Guizhou, School of Material and Metallurgy, Guizhou University, Guiyang 550025, China)
Abstract:Digestion performance of high sulfur bauxite was investigated by orthogonal experiment Regression equation of dissolution rate of alumina and sulfur was obtained. Dissolution process of high sulfur bauxite was optimized with single factor experiment. The results show that temperature is the key factor affecting dissolution performance. Dissolution rate of sulfur is obviously improved when temperature is below 26o C. Dissolution rate of alumina drops with increase of alkali concentration, while digestion time and lime dosage have no obvious effect on dissolution performance. The relative dissolution rate of alumina is 95% and dissolution rate of sulfur is below 26%, which are in high accordance to regression equation, under the optimum process parameters of high temperature and low alkaline” including digestion temperature of 250 C,N,=255 g/L, digestion time of 70 min, and lime dosage of 6%.The process is suitable for processing bauxite with sulfur content of 1. 47% below.
Key words:high sulfur bauxite; process optimization; orthogonal experiment; dissolution rate
目前,我国高硫铝土矿工业化的关键问题是如何实现经济合理地脱硫。由于硫的存在,给生产工序带来系列的负面影响,并腐蚀设备材质[1-4)]。近年来,学者们对高硫铝土矿的浮选脱硫[5-6)、焙烧脱
收稿日期:2015-08-28
硫[7-9]进行了大量研究,由于能耗与成本间题,未能实现工业化。湿法脱硫[19]曾经被认为是很有前途的方法,但由于硫转入铝酸钠溶液中的量较大,增加了后续的脱硫负担,始终未能实现突破。学者们对
基金项目:国家自然科学基金资助项目(51264006,51474079);贵州省教育厅项目(黔教合重大专项字[2012]0002);贵州省校
合作项目(LH[2014]7609)
作者简介:刘龙(1990-),男,山西阳泉人,硕士研究生;通信作者:李军旗(1962-),男,江西安福人,教授,博士生导师,