Synthesis Of A New Organic Depressant And Application In Lead-Zinc Sulfide Ore Separation

The separation of lead-zinc sulfide ore in Guangxi is difficult due to the complex ore properties, fine dissemination size of lead-zinc ore, close symbiotic relationship,and similar flotation property of lead-zinc ore, which makes it hard to separate the lead and zinc. The flotation separation research on the multi-metal sulfide mineral has attracted much attention of the scholars at home and abroad, and made great progress in the development of new agent and process in recent years.Compared to the inorganic depressants, the organic depressants are characterized by the rich variety, wide sources and less pollution, which can design the functional group and molecular weight according to the actual need. In this paper, CS2,ROCH2 OH, ClCH2 R, RNH2 and sodium hydroxide are taken as raw materials, and the organic depressants D1, D2 and D3 are prepared through substitution reaction, and purified. Characterize the product using infrared spectrum and ultraviolet spectrum detection technology, and the analysis shows that the product is the target product. The product purity testing shows that the productive rate of D1, D2 and D3 is 43.84%,67.98% and 76.32%, respectively.The new agent screening test shows that the organic depressants D1, D2 and D3 have inhibitory effect on the marmatite, D1, D2 and D3 from strong to weak. At the same time, D1 have no inhibitory effect on jamesonite. The superior depressant D1 is selected for artificial mixed mineral flotation test, and it is concluded that D1 has good selectivity for marmatite. Therefore, D1 is the best depressant for zinc.In the actual mineral flotation test, it can be known that D1 has the best inhibitory effect on zinc mineral through comparing the depressants type, superior to the combined reagent of sodium sulfite and zinc sulfate. In the closed circuit test, using thenew depressant D1, as the depressant for zinc, can obtain the lead concentrate with the lead-zinc grade of 22.15% and 4.79%, and the lead-zinc recovery is 90.89% and 3.59%,respectively. Compared to the combined reagent of sodium sulfite and zinc sulfate as the inhibitor, the grade of zinc in lead concentrate is decreased by 0.86 percent.We use the techniques of UV spectra, contact angle and zeta- potential to explore the mechanism of D1 on minerals. The results show that the depressor D1 can significantly inhibit marmatite, and by the way of chemical adsorption it adsorbs on the surface of marmatite, making the mineral surface potential shifted negatively, at the same time reduce its surface contact angle.The research on UV spectra of D1 acts on the marmatite and jamesonite shows that the surface of marmatite absorbs much more D1 than jamesonite surface. The results are corresponding to Zeta- potential detection.In the flotation separation of lead and zinc, the new depressant D1 has better inhibitory effect for zinc mineral than the sodium sulfite and zinc sulfate, and less dosage under the same condition without the toxicity and pollution, which provides a new approach for non-toxic, pollution-free and low-cost production for enterprises.