某高铝型铁尾矿低碳免烧砖的制备及性能研究OA

In order to solve the environmental pressure caused by the storage of iron tailings and achieve comprehen-sive resource utilization,a low-carbon unburned brick was prepared by pressing and molding a high alumina iron tailings and cement from Zhangjiakou city,Hebei province as raw materials.The compressive strength,flexural strength,and density of iron tailings unburned bricks were measured,and the effects of cement content and iron tailings particle size distribution on the performance of unburned bricks were investigated.The micro mechanism of iron tailings unburned bricks was analyzed by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),and scanning electron microscopy(SEM).The results showed that the strength of iron tailings unburned bricks increased with the increase of cement content,and the particle size distribution of iron tailings had the signifi-cant impact on the strength of iron tailings unburned bricks;The inner mechanism of cement content affecting the strength of iron tailings unfired brick was revealed by microscopic characterization.that is,as the cement content increases,the hydration products of cement increase,the pores of iron tailings unburned bricks were filled,and the bonding ability between iron tailings particles was enhanced,thereby improving the strength of unburned bricks.The results of this study can provide reference for the resource utilization of similar iron tailings.