氢氧化铝生产过程中结晶助剂有效成分的测定  

Determination of effective composition of crystallization auxiliary in aluminium hydroxide production process

作　　者：陈锋[1] 张宝砚[1] 毕诗文[2] 王宏光[1] 李克轩[1] 

机构地区：[1]东北大学理学院,辽宁沈阳110004 [2]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《冶金分析》2005年第6期1-4,共4页Metallurgical Analysis

基　　金：国家重大基础研究发展规划资助项目"提高铝材质量的基础研究"(G1999064902)

摘　　要：研究了拜尔法生产氢氧化铝过程中,用溶剂浮选-气相色谱法测定结晶助剂有效成分硬脂酸钠的方法.选择环己酮为浮选溶剂,样品经酸化,溶剂浮选30 min进行富集,再经CH3OH/BF3甲酯化,以毛细管色谱柱分离,邻苯二甲酸二乙酯为内标,氢火焰离子化检测器检测.硬脂酸与内标的质量比在0.1～10范围内有良好的线性关系,检出限为0.1 mg/L.方法重复性较好,硬脂酸钠的回收率为96.6%～97.8%,在现场试用取得良好效果.A solvent flotation - gas chromatography for the determination of sodium stearate in sodium aluminate solution in aluminium hydroxide production by the Bayer process was studied. Cyclohexanone was selected as a flotation solvent. The samples were acidified and concentrated by solvent flotation for 30 min, then methylated with CH3OH/BF3 and separated with gas chromatography with a PEG-20 M quartz capillary column （30 m×0.32 mm, i.d.） and detected by FID, while diethylphthalate was used as internal standard. The good linear relationship was observed with the correlation coefficients of 0.999 7 when the mass ratio of stearic acid and internal standard was 0.1 - 10. This method had good precision and the recoveries of sodium stearate were in the range of 96.6 % - 97.8 %. It has been tried to the determination of sodium stearate on the industrial scene with satisfactory results.

关 键 词：硬脂酸钠 溶剂浮选 氢氧化铝 气相色谱 

分 类 号：TF821[冶金工程—有色金属冶金]