关键词: 氧化球团, CMC, 膨润土, 醋酸钠, 改性复合黏结剂

Abstract: In order to reduce the dosage of bentonite，improve the iron grade of pellets and meet the strength requirements of green balls，preheated pellets and roasted pellets，the appropriate CMC and sodium acetate were added to modify the bentonite in the pelleting process.The dosage of CMC and sodium acetate prepared by the CMC composite binder and the modified CMC composite binder were studied based on the strength of green balls，preheated pellets and roasted pellets.The results indicated that the dosage of binder was reduced from 1.6% to 1.2% with ensuring the favorable strength of green balls，preheated pellets and roasted pellets while the modified CMC composite binder was used，which was made by adding the 0.9% CMC and 0.5% sodium acetate into bentonite.The drop strength and compressive strength of green pellets were 4.1 times and 22.12 N/one，the compressive strength of preheated pellets and roasted pellets were 532 N/one and 3 444 N/one separately.

Key words: Oxidized pellet, CMC, Bentonite, Sodium acetate, Modified composite binder