利用铁矿尾矿制备蒸压灰砂砖试验研究

Experimental Study on Preparation of Autoclaved Sand-lime Brick with Iron Tailings

在铁矿尾矿的性质分析及现有成熟的工艺技术的基础上,利用迁安某铁矿选厂尾矿为主要原料,添加生石灰、缓凝剂、调节剂,按不同配比进行条件试验。在水固比0.09,铁矿尾矿∶生石灰∶缓凝剂∶调节剂=80∶8∶3∶9,成形圧强25 MPa,蒸汽压强1.3 MPa,升温150 min,恒温360 min,降温120 min条件下制得平均抗压强度26.4 MPa、平均抗折强度5.3 MPa的蒸压灰砂砖,符合GB 11945-2006《蒸压灰砂砖》MU25技术指标的标准,实现铁矿尾矿的综合利用,并增加企业经济效益及社会效益。

Based on the analysis of the properties of iron tailings and the existing mature technology, condition test wsas conducted on the different ratio by using tailings of Qian＇an iron ore concentration plant as the main raw material and adding lime, retarding agent, regulator. When the ratio of water： solid was 0. 09, the ratio of iron tailings ： lime ： retarding agent ： regulator was 80 ： 8 ： 3 ： 9, forming pressure was 25 MPa, steam pressure was 1.3 MPa, rising temperature was 150 min ,constant temperature was 360min and cooling temperature was 120 min, autoclaved sand- lime brick with average compressive strength of 26. 4 MPa and average flexural strength of 5.3 MPa was made, whose technology index was up to the requirements of MU25 in nation standard GB 11945-2006＂ autoclaved sand-lime brick＂. The comprehensive utilization of iron tailings was realized and enterprise economic benefit and social benefit were increased.