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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。
In the simulated Bayer process alumina production dissolution conditions synthesis red goethite iron ore, the main research soluble organic matter including sodium, sodium, sodium, sodium and sodium salicylate sedimentation goatite suspension The effects of the addition of homemade polyacrylamide modified hydroxamic acid flocculant (HCPAM) on the sedimentation performance of goethite suspensions were investigated by Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) ) To study the adsorption mechanism of soluble organics on goethite surface. The results showed that the organic matter degraded the sedimentation performance of goethite suspensions. The descending order of the deteriorating degree is as follows: sodium oxalate, sodium salicylate (sodium phthalate), sodium formate and sodium acetate. In addition, the flocculant HCPAM can effectively eliminate the negative effect of sodium formate, sodium acetate and sodium oxalate on the sedimentation of goethite suspension, but can only partially eliminate the sedimentation of goethite suspension by sodium salicylate and sodium phthalate Negative effects. FT-IR and XPS spectra showed that the adsorption mechanism of these organic compounds on goethite surface was chemisorption.