改性复合黏结剂制备磁铁矿氧化球团研究

为了降低铁精矿球团生产中膨润土的添加量,提高球团铁品位的同时满足生产对生球强度和预热、焙烧球强度的要求,通过向膨润土中添加适量的CMC和醋酸钠对膨润土进行改性,以生球、预热球和焙烧球的强度为依据,研究了制备CMC复合黏结剂和改性CMC复合黏结剂需掺加CMC和醋酸钠的量。结果表明,采用向膨润土中添加0.9%的CMC和0.5%的醋酸钠所制得改性CMC复合黏结剂,可在保证生球、预热球及焙烧球强度的前提下,将球团生产的黏结剂用量从1.6%降低至1.2%,对应的生球落下强度为4.1次、抗压强度为22.12 N/个,预热球的抗压强度为532 N/个,焙烧球抗压强度为3 444 N/个。

Study of Magnetite Oxidized Pellet Prepared by Modified Composite Binder

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.