Improving pelletization of magnetite concentrate by organic complex bentonite and its industrial application

Based on insertion of small organic molecular into crystal layers of activated bentonite by sodium carbonate,an organic complex bentonite was developed.The mechanism of chemisorptions and compound molecule bridged linkage by organic complex bentonite to improve the pelletization of iron ore concentrates was demonstrated by the determination of X-ray diffraction,surface potential,wetting heat differential scanning calorimetry(DSC) and ballability index.The results show that the drop number and thermal shock temperature of green balls are increased by 0.9 times from 0.5 m height and 150 ℃,respectively,while the dosage of bentonite is decreased by over 50% from ordinary 3.0% to 1.4%,leading to an increase in iron grade of fired pellet by 1.02% and in compressive strength by 1 kN per pellet.In the meantime,the bentonite dosage is decreased and the thermal shock resistance of green balls,the strength of pellets and the iron grade of fired pellets are improved.