Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第27卷    第11期    总第224期    2017年11月

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文章编号:1004-0609(2017)-11-2356-07
氧化铝粉尘吸附脱除铝酸钠溶液中的腐植酸钠
刘桂华,陈斌斌,齐天贵,周秋生,彭志宏,李小斌,董文波

(中南大学 冶金与环境学院,长沙 410083)

摘 要: 通过测定溶液中有机碳含量的变化,结合X射线衍射光谱以及红外光谱分析及表面性质测定,研究氧化铝粉尘吸附脱除铝酸钠溶液中的腐植酸钠的影响因素及其作用机理。结果表明:500~800 ℃焙烧的氧化铝粉尘结晶差,在600 ℃下焙烧的氧化铝粉尘吸附脱除腐植酸效果最好;溶液碱浓度、吸附温度也显著影响吸附效果,45 ℃时的吸附量最大。同时,相对于500、700和800 ℃焙烧的产品,600 ℃焙烧的氧化铝粉尘表面疏水性较强、溶剂化能力较差;吸附过程中主要以物理吸附为主,也有化学吸附;吸附动力学与准二级模型吻合,化学吸附为控制步骤,表面吸附为主要的吸附形式。

 

关键字: 氧化铝粉尘;焙烧;铝酸钠溶液;腐植酸钠;吸附

Removal of sodium humate from sodium aluminate solution by adsorption with alumina dust
LIU Gui-hua, CHEN Bin-bin, QI Tian-gui, ZHOU Qiu-sheng, PENG Zhi-hong, LI Xiao-bin, DONG Wen-bo

School of Metallurgy and Environment, Central South University, Changsha 410083, China

Abstract:The removal of organics from sodium aluminate solution will significantly improve alumina quality and production efficiency. The removal of sodium humate with alumina dust was investigated by detecting total organic carbon, contact angle and analysis of X-ray diffraction and infrared spectra. The results show that roasted alumina dust is in poor crystallization in the range of 500~800 ℃ for 0.5 h. The alumina dust roasted at 600 ℃ performs the greatest adsorption capacity and adsorption rate. Moreover, the concentration of alkali soda and duration have remarkable effect on removal in sodium humate. A maximum adsorption capacity can be found at 45 ℃ within temperature range of 30~65 ℃. The results also indicate that alumina dust roasted at 600 ℃ is more hydrophobic and more difficult to be solvation relative to alumina dust roasted at 500, 700 and 800 ℃. The physisorption is predominant in addition to some occurrence of chemisorption. The adsorption kinetics mechanism satisfies second order equation, the adsorption is controlled by chemisorption and mainly occurs in the form of surface adsorption. All results provide an economical method for separation and richness of sodium humate from sodium aluminate solution.

 

Key words: alumina dust; roasting; sodium aluminate solution; sodium humate; adsorption

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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