响应面法优化高砷溶液形成臭葱石的工艺研究  

Research on Optimization Process of High Arsenic Containing Solution for the Formation of Scorodite by Response Surface Methodology

作　　者：和森 罗中秋[1] 周新涛[1,2] 李娜秋 王昊 张建辉[1] HE Sen;LUO Zhong-qiu;ZHOU Xin-taoia;LI Na-qiu;WANG Hao;ZHANG Jian-hui(School of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,China;Key Laboratory of Unconventional Metallurgy,Ministry of Education,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学化学工程学院,昆明650500 [2]昆明理工大学非常规冶金教育部重点实验室,昆明650093

出　　处：《硅酸盐通报》2018年第5期1770-1775,共6页Bulletin of the Chinese Ceramic Society

基　　金：NSFC-云南联合基金(U1137604);云铜校企预研基金(2015YT08);昆明理工大学引进人才科研启动基金(KKSY201605021);昆明理工大学分析测试基金(2016T20160009);云南省科学科技厅青年基金(2017FD093);云南省教育厅(2017ZZX147)

摘　　要：以高砷溶液为原料,采用Box-Behnken响应面优化硫酸亚铁空气氧化法沉砷形成臭葱石的工艺条件。以砷溶液初始pH、反应温度和反应时间为影响因素,以沉砷率为响应值,采用三因素三水平实验进行分析,建立了沉砷率与因素之间的二次多项式模型,确定了最优条件为pH为4,温度为95℃,时间为6.5 h。在此工艺下沉砷率达到了86.698%,与理论值88.984%接近。在此基础上,采用XRD图谱和SEM照片对最优条件下的产品进行表征,分析表明产物为结晶良好的双锥型八面体晶体结构臭葱石。Box-Behnken response surface methodology was employed to optimize the process for arsenic removal of high arsenic solution by air oxidation of ferrous sulfate solution. Meanwhile,the Box-Behnken design methodology including initial pH of arsenic solution,reaction temperature and reaction time was carried out to research the arsenic deposition rate from arsenic solution. Consequently,a quadratic polynomial model between the arsenic deposition rate and factors was established. The results indicated that the optimum conditions were determined as pH 4,temperature 95 ℃,time 6. 5 h. Under this condition,the arsenic precipitation rate reached 86. 698% was close to the theoretical value of 88. 984%. The products were characterized by XRD pattern and SEM images,and the results showed that scorodite crystal was a kind of double-cone octahedral structure.

关 键 词：臭葱石 响应面优化 沉砷率 

分 类 号：X75[环境科学与工程—环境工程]