冷固结球团用地聚合物黏结剂制备参数优化

 针对目前广泛使用的冷固结球团黏结剂高温下失效的缺点，提出使用地聚合物体系材料作为黏结剂，以保证球团的高温性能。首先使用化学分析、X射线衍射分析、红外光谱等方法对地聚合物黏结剂原料性能进行分析；随后制备偏高岭土-水玻璃地聚合物体系黏结剂并进行冷固结压块，分别研究黏结剂制备过程中参数养护温度、养护时间、n（H2O）/n（Na2O）、n（Na2O）/n（SiO2）和n（SiO2）/n（Al2O3）对球团冷态抗压强度的影响，得出此黏结剂制备最佳参数；最后探讨了地聚合物黏结剂球团高温强度演变规律。结果表明，将最优条件下制备的黏结剂应用于冷固结球团，强度可达402.3 N/个 ，满足生产要求；在惰性气氛下，地聚合物黏结剂压块强度随温度升高而升高，且高温下强度增加幅度变大，这表明地聚合物黏结剂在高温下不会失效，且高温有利于黏结剂抗压强度增加。

Preparation parameters optimization of geopolymer binder for cold-bonded pellets

To avoid the defect of traditional binders， which would lose strength under high temperatures， the geopolymer system material was used as the binder to ensure the high temperature performance of cold-bonded pellets. Chemical analysis， XRD and FR-IR were used to analyze the raw materials performance of the metakaolin-water glass geopolymer system binder. The effect of preparation parameters， such as the curing temperature， the curing time， the n（H2O）/n（Na2O），the n（Na2O）/n（SiO2）and the n（SiO2）/n（Al2O3） on the strength of pellets were studied to obtain optimized parameters. Then the strength variations of pellets under high temperatures were also discussed. The results showed that， the strength of pellets prepared under the optimal conditions was 402.4 N/P， which could meet the requirement of the actual production. Moreover， when pellets were roasted under the inert atmosphere， the strength of pellets increased with the increasing of the temperature， and the strength increased more significantly under higher temperatures. The results indicated that geopolymer binder would not lose its strength under high temperatures， and increase temperature was conductive to the strength promotion.