改性淀粉抑制赤铁矿反浮选石英的作用机理研究
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摘要
通过矿物浮选试验、动电位测定以及吸附量测试,考察了4种淀粉抑制剂对赤铁矿和石英浮选性能的影响,并探讨了其作用机理。在碱性条件下,改性淀粉抑制剂对赤铁矿抑制效果明显,且以改性玉米淀粉效果最佳,改性磷酸酯淀粉、改性羧甲基淀粉的抑制效果次之,而普通淀粉抑制作用一般。同时4种淀粉抑制剂对主要脉石矿物石英的抑制效果均不明显。pH=10~12.5条件下,改性玉米淀粉因其羟基氧和裸露在赤铁矿表面的铁元素发生了化学键合,因而选择性抑制能力最佳。分子动力学模拟表明,改性玉米淀粉片段与赤铁矿作用更为紧密,验证了改性淀粉能更好地抑制赤铁矿。
Effects of four starch depressants on flotation performance of hematite and quartz were investigated through flotation tests,zeta potential measurement and adsorption analysis. Modified starches showed obvious depressing effect on hematite in alkaline pulp,among which,the causticized corn starch(CCoS) possessed the best depressing effect,followed by causticized phosphate starch(CPS) and causticized carboxymethyl starch(CCaS). Nevertheless,common starch(CS) showed a limited depressing capacity. All these four starch depressants didn' t show obvious depressing effect on quartz. CCoS showed the best selective depressing capacity under a pH value of 10 ~ 12. 5,as its hydroxyl oxygen was chemically bonded with exposed iron atoms on hematite surface and therewith strengthened the depression of hematite. The molecular dynamics simulation indicated that the interaction between the fragments of CCoS and hematite was much more intensive,which also testified the stronger depressing effect of CCoS on hematite.
Effects of four starch depressants on flotation performance of hematite and quartz were investigated through flotation tests,zeta potential measurement and adsorption analysis. Modified starches showed obvious depressing effect on hematite in alkaline pulp,among which,the causticized corn starch(CCoS) possessed the best depressing effect,followed by causticized phosphate starch(CPS) and causticized carboxymethyl starch(CCaS). Nevertheless,common starch(CS) showed a limited depressing capacity. All these four starch depressants didn' t show obvious depressing effect on quartz. CCoS showed the best selective depressing capacity under a pH value of 10 ~ 12. 5,as its hydroxyl oxygen was chemically bonded with exposed iron atoms on hematite surface and therewith strengthened the depression of hematite. The molecular dynamics simulation indicated that the interaction between the fragments of CCoS and hematite was much more intensive,which also testified the stronger depressing effect of CCoS on hematite.
引文
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[4]Huang D B,Zong B,Wei R F,et al.Direct reduction of highphosphorus oolitic hematite ore based on biomass pyrolysis[J].Journal of Iron and Steel Research,International,2016,23(9):874-883.
[5]牛福生,张晓亮,张晋霞,等.淀粉对赤铁矿的絮凝特性及作用机理研究[J].矿冶工程,2016(6):30-34.
[6]胡晖.难选鲕状赤铁矿的浮选研究现状及展望[J].湖南有色金属,2016,32(1):27-29.
[7]Lima N P,Valadao G E S,Peres A E C.Effect of amine and starch dosages on the reverse cationic flotation of an iron ore[J].Minerals Engineering,2013,45:180-184.
[8]石云良,曾克文,周光俊,等.正-反浮选新工艺处理美国蒂尔登铁矿石[J].国外金属矿山,1998(4):52-54.
[9]姜效军,霍连波,碗建华,等.赤铁矿中石英的可浮性机理研究[J].矿冶工程,2015(1):61-63.
[10]Liu Q,Zhang Y,Laskowski J S.The adsorption of polysaccharides onto mineral surfaces:an acid/base interaction[J].International Journal of Mineral Processing,2000,60(3):229-245.
[11]李海普,胡岳华,蒋玉仁,等.变性淀粉在铝硅矿物浮选分离中的作用机理[J].中国有色金属学报,2001,11(4):697-701.
[12]Wang L,Sun W,Hu Y H,et al.Adsorption mechanism of mixed anionic/cationic collectors in Muscovite-Quartz flotation system[J].Minerals Engineering,2014,64(1):44-50.
[13]Kar B,Sahoo H,Rath S S,et al.Investigations on different starches as depressants for iron ore flotation[J].Minerals Engineering,2013,49(8):1-6.
[14]Mohammadi-jam S,Burnett D J,Waters K E.Surface energy of minerals-Applications to flotation[J].Minerals Engineering,2014,66(1):112-118.
[15]刘若华.不同淀粉对赤铁矿抑制机理及工艺研究[D].长沙:中南大学资源加工与生物工程学院,2012.