Central composite design for optimization and formulation of desulphurization of iron ore concentrate using atmospheric leaching process

作     者：Ali Mostafavi Hassan Rezvanipour Dariush Afzali Tayebeh Shamspur Amir Hajizadehomran 

作者机构：Department of Chemistry Shahid Bahonar Universityof Kerman Kerman 84156-83111 Iran Gol-e-Gohar Iron Ore Mining and Industrial CompanySirjan Km 50 of Shiraz road 111/78185 Kerman Iran Department of Environment Institute of Science and HighTechnology and Environmental Sciences GraduateUniversity of Advanced Technology Kerman 76311-33131Iran 

出 版 物：《Journal of Iron and Steel Research International》 (Journal of Iron and Steel Research, International)

年 卷 期：2018年第25卷第1期

页      面：57-64页

核心收录：

学科分类：081704[工学-应用化学] 081902[工学-矿物加工工程] 0819[工学-矿业工程] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070303[理学-有机化学] 0703[理学-化学] 

基　　金：Gol-e-Gohar Mining and Industrial Co 

主　　题：Desulphurization Iron ore concentrate Sulphide mineral leaching Central composite design Atmosphericleaching process 

摘      要：Owing to the negative effects of sulphur in iron ore on steelmaking process and environment, a tank leaching process was performed in atmospheric conditions to remove the sulphur from the iron ore concentrate and simultaneously to transform sulphide minerals into useful by-products. To achieve desirable sulphur removal rate and efficiency, central composite design was adopted as a response surface methodology for the optimization and evaluation of the process. A full-quadratic polynomial equation between the sulphur removal and the studied parameters was established to assess the behaviour of sulphur removal as a function of the factors and to predict the results in various conditions. The optimum conditions were obtained based on the variance tests and response surface plots, from which the optimized ranges for each factor resulting in the best response （corresponding to the highest percentage of desulphurization） could be then achieved. The results show that most desirable conditions are atmospheric leaching in 1.39 mol/dm3 nitric acid and 0.88 mol/dm3 sulphuric acid for 47 h. The designed process under the optimized desulphurization conditions was applied to a real iron ore concentrate. More than 75% of the total sulphur was removed via the leaching process. In addition to the desulphurization, the conversion of sulphide-bearing minerals into useful by-products, extraction of valuable metals, and executing the process under atmospheric conditions are the other advantages of the proposed method.