基于Box-Behnken试验设计的柞水菱铁尾矿最佳回收工艺参数

The Optimum Recovery Process Parameters of Siderite Tailings in Zhashui Based on the Box-Behnken Center-united Experimental Method

根据Box-Behnken中心组合试验设计原理,在条件试验基础上,采用六因素三水平的响应曲面分析法,建立了柞水菱铁尾矿深度还原-磁选工艺的二次多项式模型,试验以磁选铁精矿的品位为响应值作响应面和等高线值,研究了不同试验条件对铁精矿品位的影响。结果表明,基于Box-Behnken试验设计的响应面分析及模型拟合所得参数可靠,在配碳量为21.5%,碳酸钠用量14.1%,焙烧温度1278℃,保温时间125 min,-0.037 mm含量为86%和磁场强度260 m T为时,可获得品位为90.86%,回收率为81.35%的最终选别指标。

the parameters of deep reduction-magnetic separation process were researched in this paper. Based on one-factor tests, the Box-Behnken center-united experimental method with 6 factors and 3 levels was adopted. A second order quadratic equation for deep reduction-magnetic separation process of siderite tailings in Zhashui was established and the iron grade of the magnetic concentrate was used as the response value for contour and response surface. The effect of dosage of coal and Na2CO3, reducing temperature and time, grinding time and magnetic field strength was explored on the basis of the analysis of the response surface plots and their corresponding contour plots. The results indicated that the analysis of the model was credible and the optimum process condition was obtained as follows： coal dosage： 21.5%, Na2CO3 dosage： 14.1%, reducing temperature： 1278~C, reducing time： 125 min, -0.037 mm fraction： 86%, magnetic field strength： 260 mT. Under the optimized condition, a concentrate with iron grade of 90.36% and recovery of 81.35% was obtained.