高炉瓦斯灰含碳球团粘结剂研究

在掌握高炉瓦斯灰和粘结剂特性的基础上，通过测试生球、干球和焙烧后球团的抗压强度和落下强度，实验考察单一粘结剂和复合粘结剂对高炉瓦斯灰含碳球团强度的影响. 结果表明，加入淀粉类粘结剂能改善球团的低温强度，生球的抗压和落下强度分别达到72 N/个和5.9次/0.5 m；干球的抗压和落下强度分别达到58 N/个和4.3次/0.5 m；但焙烧后球团的抗压强度相对较低. 加入水玻璃含硅类粘结剂能改善其高温强度，焙烧后球团抗压强度最高达到1764 N/个，但生球和干球的强度较低，达不到生产要求. 加入玉米淀粉和水玻璃组成的复合粘结剂后球团强度的改善效果更明显，生球的抗压和落下强度最高达到60 N/个和5.5次/0.5 m；干球的抗压和落下强度达到55 N/个和3.4次/0.5 m；焙烧后球团的抗压强度最高达到1958 N/个.

Study on Roasting of Carbon-containing Pellets from Blast Furnace Dust with Different Binders

Based on the physicochemical properties of blast furnace dust and binders, the compressive strength and falling strength of pellets are tested, and the effects of some sole and compound binders on the strength of blast furnace dust carbon-containing pellets are studied experimentally. The results show that the starch binders can improve the strength of pellets at low temperature. The compressive strength and falling strength of green balls are 72 N and 5.9 times, and those of dry pellets 58 N and 4.3 times, but the strength of roasted pellets is relatively low. The silicon-containing binders can improve the pellets at high temperature. The compressive strength of roasted pellets is 1764 N, but the strength of green balls and dry pellets is relatively low. Even though the strength of pellets can be raised, it still does not reach the objective. The compound binder of corn starch and sodium silicate is better than sole binders, the compressive strength and falling strength of green balls are 60 N and 5.5 times, those of dry pellets 55 N and 3.4 times, and roasted pellets 1958 N.