可溶性有机物对拜耳法赤泥中针铁矿沉降性能的负作用（英文）

发布时间：2018-04-06 05:25

本文选题：针铁矿　切入点：可溶性有机物　出处：《Transactions of Nonferrous Metals Society of China》2017年02期

【摘要】：在模拟拜耳法氧化铝生产溶出条件下合成赤泥中主要含铁组分针铁矿,研究可溶性有机物包括甲酸钠、乙酸钠、草酸钠、水杨酸钠和邻苯二甲酸钠对针铁矿悬浮液沉降性能的影响,考察添加自制聚丙烯酰胺改性氧肟酸型絮凝剂(HCPAM)时针铁矿悬浮液的沉降性能,分别采用傅里叶红外光谱(FT-IR)和X射线光电子能谱(XPS)研究可溶性有机物在针铁矿表面上的吸附机理。结果表明:有机物使针铁矿悬浮液的沉降性能恶化,恶化程度由大到小顺序如下:草酸钠、水杨酸钠(邻苯二甲酸钠)、甲酸钠、乙酸钠。此外,絮凝剂HCPAM能够有效消除甲酸钠、乙酸钠和草酸钠对针铁矿悬浮液沉降的负作用,但只能部分消除水杨酸钠和邻苯二甲酸二钠对针铁矿悬浮液沉降的负作用。FT-IR和XPS光谱分析结果表明:上述有机物在针铁矿表面上的吸附机理为化学吸附。
[Abstract]:The main iron-containing goethite in red mud was synthesized under the condition of analogue Bayer alumina production. The soluble organic matter including sodium formate sodium acetate sodium oxalate was studied.The effect of sodium salicylate and sodium phthalate on the settling property of goethite suspension was studied. The sedimentation property of the suspension of goethite was investigated by adding self-made polyacrylamide modified hydroxamic acid flocculant (HCPAM).The adsorption mechanism of soluble organic compounds on goethite surface was studied by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS).The results show that the sedimentation property of goethite suspension is deteriorated by organic matter, and the degree of deterioration is as follows: sodium oxalate, sodium salicylate (sodium phthalate, sodium formate, sodium acetate).In addition, flocculant HCPAM can effectively eliminate the negative effects of sodium formate, sodium acetate and sodium oxalate on the sedimentation of goethite suspension.However, the negative effects of sodium salicylate and disodium phthalate on the sedimentation of goethite suspensions can only be partially eliminated. The results of FT-IR and XPS spectra show that the adsorption mechanism of these organic compounds on goethite surface is chemisorption.
【作者单位】：中南大学化学化工学院;
【基金】：Projects(51174231,51134007)supported by the National Natural Science Foundation of China
【分类号】：TQ133.1;O647.3

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