The hydrophobic flocculation flotation of rutile fines in the presence of styryl phosphonic acid（SPA） was investigated by flotation tests, zeta-potential measurement, optical microscope observation, laser-based particle size analysis, adsorption measurements and DLVO theory. The flotation tests indicated that rutile fines could be flocculated by SPA, and pH, shear force（stirring speed） and stirring time played significant roles in flocculation. The isoelectric point（IEP） and zeta-potential in whole range all moved to negative values as SPA was added according to the results from zeta-potential measurement. It was demonstrated that the primary reason for above was chemical adsorption. The laser-based particle size results showed the particle size at a stirring speed of 1800 r/min and 1000 mg/L SPA was the largest in all experiments. Furthermore, using the optical microscope observation and flotation tests, it was important for flotation of rutile fines to produce the flocculant. In the light of above-mentioned facts, floc flotation of rutile fines could be induced in the form of chemical adsorption by SPA to increase particle size. The data calculated from DLVO theory also indicated that chemical adsorption was the main reason for the formation of flocculant.
Xiao-tao HUANGWei XIAOHong-bo ZHAOPan CAOQi-xiu HUWen-qing QINYan-sheng ZHANGGuan-zhou QIUJun WANG
The hydrophobic flocculation of marmatite fines in aqueous suspensions induced by butyl xanthate （KBX） and ammonium dibutyl dithiophosphate （ADD） was investigated using laser particle size analysis, microscopy analysis, electrophoretic light scattering, contact angle measurement and infrared spectroscopy. The studies were performed on single minerals with size 〈20 μm by varying several parameters, including pH, collector concentration and kerosene addition. The results show that the floc fotation closely correlated with the size of flocs and the particle hydrophobicity, but was not lowered with increasing the particle surface charges due to collector adsorption. Under good operating conditions, the floc flotation of marmatite fines as a function of KBX and ADD can all reach floatability over 90%, in comparison with conventional flotation obtaining floatability of about 60%. It also has been found that a small addition of kerosene greatly improved the floc flotation because of the formation of oil films on marmatite particles. The results of FTIR spectra indicate that adsorption of the two collectors onto marmatite were chemical adsorption.
本文研究了浮选方铅矿和闪锌矿絮闭的方法，即所谓的絮闭浮选法。通过戊基钾黄药和动能输入引疏水絮凝。用－20μm单矿物进行微量浮选和絮闭粒度测定，研究了PH值，戊基钾黄药的浓度，煤油用量和搅拌强度等参数对絮闭浮选的影响。结果表明，絮闭浮选效果与絮团密度相关，在优化的操作条件下，方铅矿和闪锌矿的絮闭浮选回收率可达到100％，而常规浮选的回收率只有40％，试不发现，少量的煤油可大幅度改进浮选指标，大量节省戊基钾黄药的用量，还用墨西哥Rey de Plata细粒浸染的铅、锌、银、金和铜矿石进行了絮闭浮选试验，试验结果表明，不仅闭浮选的尾矿有用金属损失低，而且精选效率，获得的精矿闰的回收率均比常规浮选高得多，前者可能是由于细粒有用矿物回收率高，后者可能是由于絮团形成和添加煤油使有用矿物浮选速度加快。
