Study On Separation Of Magnetite And Silica By Using Cationic Collector

In order to resolve the technical difficulty that is complicated to dispose of the silica-fine particle in magnetite, we have taken on some research about it. Based on a lot of analysis of experimental investigation and current development states about separating technology, a very effective collector and a simple flotation flowsheet that can desilicate silica have been developed successfully.The main contents of this paper are following:(1) Synthesizing the cationic collector GE-601 and preparing Raney-Ni-catalyst that is needed in experiment.The findings are that the synthesized cationic collector has good selectivity and high collection ability and that the prepared Raney-Ni-catalyst also has good effect on hydrogenation and high activity at the experimental optimum through studying the technical parameters of synthesizing the cationic collector GE-601 and preparing Raney-Ni-catalyst.(2) Researching systematically the floatability of silica, pure-magnetite and Janshan magnetite.After researching the dosage of cationic collector GE-601, the pH of solution and dosage of amylum affected on the floatability of all kinds of ores, the findings indicate that the collector has a strong affection on silica and its selectivity in separating silica from magnetite is good, and that the concentrate grade of Fe is 69.37%, which contains SiO2 about 3.78% , and its recovery is about 90.67%. All those present the synthesis of the cationic collector GE-601 is successful.At the same time, through comparing systematically the advantages and the disadvantages between the collector GE-601 and dodecylamine floating Jianshan magnetite, it has been found that the new collector's selectivity is better than dodecylamine's and that it can produce less brittle foam ,which can be threated much more simple than dodecylamine's in the later operation procedures. And the former's technology is simple. In addition, it has also been found that the new collector GE-601 has a good low-temperature resistant property and its result at 8℃ is about the same one at 25℃.(3) Determining the zeta-electric potential on the surface of silica and discussing the mechanism of interaction between flotation reagents and ores with Infrared Spectra.The change of the zeta-electric potential on the surface of silica in the distilledwater and the GE-601-hydrochloride solution indicate that there is negative charge on the surface of silica which increases with increasing of pH in the distilled water, and PZC of silica is about 2.5. In the hydrochloride solution of GE-601, the negative charge decreases apparently. In the area of feeble acidity, especially at about PZC, the zeta-electric potential changes very little on the surface of silica. When the pH exceeds 5, the charge will augment. Those show that a great deal GE-601 is adsorbed on the surface of silica and that floatability of silica is good.After analyzing IR of the interaction between the collector and silica, between amylum and silica, between amylum and magnetite, it has found that the cationic collector has strong absorbability on the surface of silica and that the amylum has weak absorbability on it and it is easy to disabsorb from the surface of silica, which present it can not restrain silica and that amylum has strong absorbability on the surface of magnetite, which shows that amylum can restrain magnetite.This researching indicates that using the synthesized high effective collector can produce top quality iron ore whose concentrate grade Fe is over 69%.Thus it can reduce the cost of iron-making largely and increase utilization coefficient of blast furnace so as to get more economical benefits. And it has also presented that the new collector is a kind of top quality reagent which has a good selectivity and strong capture effect.