冶金球团用膨润土半干法钠化改性试验

摘要

Semi-dry sodium-modified experiment was conducted using Ca-bentonite produced from Fuxin as raw material. The results show that with Na2 CO3 dosage of 2. 5%,water dosage of 25%,extrusion times of two,the swelling value of modified bentonite can increase from 8. 3 mL/g to 55 mL/g and the gelatin value increases from 1. 1 mL/g to 5. 2 mL/g. With the cue ball generated time of 2 min,grown up for 15 min,tight time for 3 min,properties of pellet produced with bentonite dosage of 1. 7% is better than pellet produced with original bentonite dosage of 2. 0%. Pellet with bentonite dosage of 1. 7%,0. 5 m drop strength of green pellets is 4. 1 times,explosion temperature is 510 ℃ and the compression strength of green pellet is 9. 70 N/P,can meet the requirements of pellet used in metallurgy industry. Semi-dry sodium-modified bentonite can reduce the dosage of bentonite in pellets production.%以阜新某钙基膨润土为原料，采用半干法对其进行钠化改性试验，并考察了改性前后膨润土对所制备球团性能的影响。结果表明：在Na2 CO3添加量为2．5%、补加水量为25%、挤压次数为2次条件下，改性后膨润土的膨胀容和胶质价分别由原土的8．3 mL/g和1．1 mL/g提高到55 mL/g和5．2 mL/g。在母球生成时间为2 min、母球长大时间为15 min、生球紧密时间为3 min条件下，钠化后膨润土添加量为1．7%时所制备球团的各项指标均高于原土添加量为2．0时所制备球团的指标。钠化后膨润土添加量为1．7%时，生球的落下强度为4．1次、爆裂温度为510℃、抗压强度为9．70 N/个，可以满足冶金用球团的需要。采用半干法制备钠化膨润土可以有效降低生产冶金球团时膨润土的添加量。