Depressing effect of hydroxamic polyacrylamide on pyrite

Abstract

The performance of hydroxamic polyacrylamide (HPAM) in mineral flotation was tested on the samples of calcite, diaspore and pyrite. It is found that HPAM expresses intensive depression on pyrite and can be used as effective depressants for pyrite. The depression mechanism of HPAM to pyrite was investigated by the determination of contact angle, zeta potential, adsorptive capacity for collectors and infrared spectrum. A lower contact angle, more negative zeta potential, less xanthate adsorptive capacity, and the formation of chemical bonding were determined, which reveals that the strong chemical interactions exist between HPAM and pyrite surface. The group electronegativity of HPAM was calculated to explain the differences of interaction between reagent and minerals.

Keywords

hydroxamic / polyacrylamide / depressant / pyrite

References

[1] BoultonA, FornasieroD, RalstonJ. Selective depression of pyrite with polyacrylamide polymers[J]. International Journal of Mineral Processing, 2001, 61(1): 13-22

[2] GuevellouY, NoikC H, LecourtierJ, et al.. Polyacrylamide adsorption onto dissolving minerals at basic pH[J]. Collide and Surfaces A: Physiochemical and Engineering Aspects, 1995, 100(25): 173-185

[3] SungK C, HanR Y, HuO Y P, et al.. Controlled release of nalbuphine prodrugs from biodegradable polymeric matrices: influence of prodrug hydrophilicity and polymer composition[J]. International Journal of Pharmaceutics, 1998, 172(1 – 2): 17-25

[4] HowardK A, DashP R, ReadM L, et al.. Influence of hydrophilicity of cationic polymers on the biophysical properties of polyelectrolyte complexes formed by self-assembly with DNA[J]. Biochimica et Biophysica Acta/General Subject, 2000, 1475(3): 245-255

[5] RichardsR W, WelshG. Deformation of matrix macromolecules in a uniaxially extended styrene-isoprene-styrene linear triblock copolymer[J]. European Polymer Journal, 1995, 31(12): 1197-1206

[6] AdamsG W, CowieJ M G. Blends of rigid and flexible macromolecules: poly (benzimidazole) mixed with poly(vinyl acetate-stat-vinyl alcolol) copolymers[J]. Polymer, 1999, 40(8): 1993-2001

[7] SinghR PPrasadP N, MarkJ E, FaiT J. Advanced turbulent drag reducing and flocculating materials based on polysaccharides[A]. Polymers and Other Advanced Materials: Emerging Technologies and Business Opportunities[C], 1995, London, Plenum Press: 227-227

[8] ZhangJ, HuguenardC, ScarnecchiaC, et al.. Stabilization and destabilization of hematite suspensions by neutral and anionic polyacrylamide[J]. Colloids Surf A, 1999, 151(1 – 2): 49-63

[9] TripathyT, SinghR P. High performance flocculating agent based on partially hydrolyzed sodium alginate-g-polyacrylamide[J]. European Polymer Journal, 2000, 36(7): 1471-1476

[10] PughR J. Macromolecular organic depressants in sulphide flotation—a review[J]. Int J Miner Process, 1989, 25(2): 101-130

[11] XuD D, AplanF F. Joint of metal ion hydroxy complexes and organic polymers to depress pyrite and ash during coal flotation [J]. Miner Metall Process, 1994, 11: 223-230

[12] NagarajD R. Development of new flotation chemicals [J]. Trans Indian Inst Met, 1997, 50(5): 355-363

[13] ZhangJian-feng, HuYue-hua, WangDian-zuo. Preparation and determination of hydroximic polyacrylamide[J]. Journal of Central South University of Technology (English Edition), 2002, 9(3): 177-180

[14] WANG Dian-zuo. Hydrophile-hydrophobia balance of flotation reagent[A]. Somasundran P. Advances in Mineral Processing, A Half-century of Progress in Application of Theory to Practice, Proceedings of a Symposium honoring N. Arbiter on His 75th Birthday[C]. New Orleans, 1986. 260.