新型铁矿石反浮选捕收剂DLC-2浮选性能及机理

Flotation Performance and Mechanism of a New Collector DLC-2 for Reverse Flotation of Iron Ore

复配了一种以油酸(钠)为主要成分的混合捕收剂,并从接触角及红外光谱角度对其浮选铁矿石的机理进行了比较研究。开路浮选实验结果表明,与现场药剂相比,在精矿回收率相近的情况下,自配药剂(DLC-2)可获得铁含量为58.34%的精矿,高于现场药剂1.64个百分点。接触角测量结果显示,二氧化硅经氧化钙、淀粉和油酸钠接触改性后,接触角由65.5°增大到74.3°,疏水性能增强,易于与氧化铁分离;单矿物的FTIR测试结果表明,浮选药剂在氧化铁表面以物理吸附为主,在二氧化硅表面发生了化学吸附。

A mixture collector with sodium oleate as the main ingredients was prepared,and its flotation performance and mechanism in processing iron ore was studied and compared with commercial collector by use of contact angle and infrared spectra.An open-circuit flotation was made and the results showed that the iron content of concentrate obtained by using the prepared collector（DLC-2） was 58.34%,which was 1.64% more than one obtained by using commercial collector under the similar recovery of iron concentrate.The measuring data of contact angle showed that the contact angle of the silicon dioxide particles which were modified with calcium oxide,amylum and sodium oleate could increase from 65.5° to 74.3°,its hydrophobic property was enhanced,and it was easier to be free from ferric oxide particles.The FTIR results of single mineral showed that flotation reagents are physically absorbed on the surface of ferric oxide,while chemically adsorbed on the surface of silicon oxide.