羧甲基纤维素钠提高赤铁矿原矿含碳球块强度的机理  

Mechanism of sodium carboxymethyl cellulose for improving the strength of briquettes made of hematite ore and coal

作　　者：魏玉霞[1] 孙体昌[1] 余文[1] 曹允业[1] 刘真真[1] 

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083

出　　处：《北京科技大学学报》2013年第4期432-437,共6页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(51074016)

摘　　要：采用红外光谱、X射线光电子能谱、接触角测定等方法对添加羧甲基纤维素钠的原矿压球所得含碳球块强度提高机理进行了研究.发现黏结剂羧甲基纤维素钠中羧基(—COOH)和羟基(—OH)在原矿颗粒表面产生了化学吸附作用,使矿石颗粒表面的亲水性下降;而羧甲基纤维素钠中有机碳链与煤粒表面作用,使煤的疏水性下降.原矿和煤粒依靠羧甲基纤维素钠高分子有机链结合起来,通过黏结剂颗粒间的黏附能力形成具有一定强度的"连接桥"网状结构.因此加入羧甲基纤维素钠后原矿含碳球块强度得到大幅提高.The mechanism of adding sodium carboxymethyl cellulose （CMC） to improve the strength of hematite ore and coal briquettes was investigated by infrared spectroscopy （IRS）, X-ray photoelectron spectroscopy （XPS） and contact angle measurements. It is found that -OH and -COOH in CMC chemically absorb at the surface of hematite ore and reduce the hydrophilic character of ore particles, while hydrocarbon chains in CMC bond on the surface of coal and reduce the hydrophobic character of coal particles. Hematite ore and coal grains are bonded by the organic skeleton of CMC, and form a supporting network bridged by CMC chains between the particles to ensure the good strength of the briquettes. Therefore, the strength of hematite ore and coal briquettes is highly improved with the addition of CMC.

关 键 词：赤铁矿 压球 羧甲基纤维素钠 强度 

分 类 号：TF046.6[冶金工程—冶金物理化学] TD927[矿业工程—选矿]