有机黏结剂强化铁精矿的成球性能
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摘要
通过造球试验、红外光谱分析、动电位测定、接触角测量和黏度测定研究了有机黏结剂提高磁铁矿精矿球团强度的效果及作用机理.结果表明,以瓜尔胶(Guar)为黏结剂时湿球强度最大,羧甲基纤维素(CMC)次之,羧甲基淀粉(CMS)最小;干球强度则与黏结剂用量成显著正相关.红外分析表明,CMS和CMC主要通过羧基和羟基吸附在铁精矿表面,Guar主要通过羟基吸附在铁精矿表面.CMS和CMC使铁精矿表面电负性增强,Guar使其电负性减弱;三种有机黏结剂吸附在磁铁矿精矿表面,皆使其表面接触角减小,亲水性增强.黏结剂浓度相同时,溶液黏度越大,湿球强度越大.
Binding effects and mechanisms of organic binders on the magnetite concentrate have been investigated by pelletizing test,FTIR analysis,measurements of zeta potential,contact angle,and binder solution viscosity. Results indicate that w et strengths of pellets w ith guar gum are the largest,follow ed by CM C and CM S. Furthermore,it presents a significant positive correlation betw een the dosage of organic binders and dry pellet strengths. FTIR analysis illustrates that CM S and CM C can adsorb onto the magnetite concentrate by carboxyl methyl and hydroxyl,w hile the adsorption of guar gum onto the magnetite concentrate is mainly through hydroxyl.M eanw hile,CM S and CM C can increase the negative charge of the magnetite concentrate surface,w hile guar gum reduces that of the magnetite concentrate. Besides,the adsorption of organic binders on the magnetite concentrate decreases the contact angle and increases the w ettability of the magnetite concentrate w ith w ater. Results also show that the bigger the viscosity of the binder solution is,the higher the w et strengths of the magnetite concentrate pellets are under the same binder concentration.
Binding effects and mechanisms of organic binders on the magnetite concentrate have been investigated by pelletizing test,FTIR analysis,measurements of zeta potential,contact angle,and binder solution viscosity. Results indicate that w et strengths of pellets w ith guar gum are the largest,follow ed by CM C and CM S. Furthermore,it presents a significant positive correlation betw een the dosage of organic binders and dry pellet strengths. FTIR analysis illustrates that CM S and CM C can adsorb onto the magnetite concentrate by carboxyl methyl and hydroxyl,w hile the adsorption of guar gum onto the magnetite concentrate is mainly through hydroxyl.M eanw hile,CM S and CM C can increase the negative charge of the magnetite concentrate surface,w hile guar gum reduces that of the magnetite concentrate. Besides,the adsorption of organic binders on the magnetite concentrate decreases the contact angle and increases the w ettability of the magnetite concentrate w ith w ater. Results also show that the bigger the viscosity of the binder solution is,the higher the w et strengths of the magnetite concentrate pellets are under the same binder concentration.
引文
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[3]Halt J A,Kawatra S K.Review of organic binders for iron ore concentrate agglomeration[J].Minerals&Metallurgical Processing,2014,31(2):73-94.
[4]Shapovalov A N,Zavodyanyi A V.The use of bentonite clays from the Voskresensk deposit to make iron-ore pellets[J].Metallurgis,2014,58(5/6):367-371.
[5]Sivrikaya O,Arol A I.The bonding/strengthening mechanism of colemanite added organic binders in iron ore pelletization[J].International Journal of Mineral Processing,2012,110/111:90-100.
[6]Jiang T,Han G,Zhang Y,et al.A further study on the interaction between one of organic active fractions of the MHA binder and iron ore surface[J].International Journal of Mineral Processing,2011,100(3/4):172-178.
[7]Bellamy L J.The infra-red spectra of complex molecules[M].London:Chapman and Hall,1975:184-199.
[8]Yang G,Fan X,Chen X,et al.Interaction mechanism between carboxyl methyl cellulose and iron ore concentrates in iron ore agglomeration[J].Journal of Central South University,2015,22(4):1241-1246.
[9]Iveson S M,Litster J D,Hapgood K,et al.Nucleation,growth and breakage phenomena in agitated wet granulation processes:a review[J].Powder Technology,2001,117(1):3-39.
[10]Wei R F,Li J X,Tang G W,et al.Strength and consolidation mechanism of iron ore and coal pellets[J].Ironmaking&Steelmaking,2014,41(7):514-520.
[11]Kaliyan N,Morey R V.Natural binders and solid bridge type binding mechanisms in briquettes and pellets made from corn stover and switchgrass[J].Bioresource Technology,2010,101(3):1082-1090.