基于均匀设计制备铁尾矿高强结构材料

 铁尾矿高强结构材料中，胶凝材料通常采用梯级粉磨的方式进行制备。为了优化梯级粉磨方案，通过均匀设计方法研究了梯级粉磨中各阶段粉磨效果对材料力学性能的影响。利用SPSS 软件中逐步回归分析方法建立了以强度为目标函数的回归方程，用Matlab 软件中的优化技术求出了铁尾矿制备高强结构材料的优化粉磨方案。结果表明：将梯级粉磨各阶段粉磨时间确定为21、67 和57 min，比表面积分别达到285、485 和550 m²/kg，制备出的高强结构材料测得抗压强度可达75.28 MPa。优化梯级粉磨方案的过程说明胶凝材料的制备过程中“微磨球效应”发挥了积极的作用。

Preparation of High Strength Structural Materials Using Iron Ore Tailings Based on Uniform Design

High strength cementitious materials are usually prepared using iron ore tailings by step-milling method. For optimal stepmilling, this paper studies its effect on mechanical properties of the high strength structural materials based on uniform design. Stepwise regression analysis in SPSS software was used to establish the regression equation, which takes the strength of concrete as the objective function, and the optimum milled program for preparation of the high strength structural materials was obtained by the optimization technology in the Matlab software. The result of the experiment shows that the high strength structural material was successfully prepared when the milling time of each stage in the step-milling was set to be 21, 67 and 57 min and the specific surface areas were 285, 485and 550 m²/kg. Its compressive strength reached 75.28 MPa. The optimization of the step-milling method shows that the micro-ball effects play an important role in preparation of the cementitious materials.