改性聚丙烯酰胺对赤铁矿强磁选的影响
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摘要
基于聚团分选理论,采用改性聚丙烯酰胺(HPM)选择性聚团调浆-湿式强磁选工艺,考察了药剂用量、矿浆pH以及搅拌转速等因素对微细粒赤铁矿强磁分选效果的影响.通过扫描电镜检测、EDS能谱分析、动电位测试以及红外光谱检测等方法研究了物料聚团磁选前后的微观形貌以及药剂作用后矿物表面特性的变化,分析了药剂与矿物表面的作用机理.结果表明:在药剂用量10 g/t、矿浆pH 10、搅拌转速954 r/min的条件下,采用"选择性聚团-强磁选工艺"与常规强磁选工艺指标相比,精矿铁回收率提高了5. 39%.添加HPM调浆后原矿中矿物颗粒表观粒径显著增加,在强磁选作业中添加HPM调浆能够强化对微细粒赤铁矿的回收,HPM对赤铁矿具有选择性絮凝聚团作用,且在赤铁矿表面存在静电吸附和氢键吸附,在石英表面不发生吸附作用.
Based on the theory of flocculation-separation process, effects of modified polyacrylamide( HPM) dosage,pulp pH and stirring speed on high intensity magnetic separation of fine hematite ore were investigated by modified polyacrylamide( HPM) selective agglomeration pulp preparation-wet high intensity magnetic separation process. Scanning electron microscopy,EDS spectroscopy,Zeta potential and infrared spectrum measurements were used to study the micro-morphology of aggregates before and after magnetic separation and the change of surface properties of minerals after the action of reagents. The magnetic separation experimental results showed that,compared with the conventional high intensity magnetic separation,using selective agglomeration-high intensity magnetic separation process,the concentrate recovery of the presence of HPM in magnetic separation increases by 5. 39% on condition that HPM dosage is 10 g/t,pulp pH value is 10 and stirring speed is 954 r/min. The apparent particle size of mineral particles in raw ore increases significantly after adding HPM and the recovery of fine hematite can be enhanced by high intensity magnetic separation with the presence of HPM. HPM can selectively flocculate hematite,and there are electrostatic adsorption and hydrogen bond adsorption on the surface of hematite,but there is no adsorption on the surface of quartz.
Based on the theory of flocculation-separation process, effects of modified polyacrylamide( HPM) dosage,pulp pH and stirring speed on high intensity magnetic separation of fine hematite ore were investigated by modified polyacrylamide( HPM) selective agglomeration pulp preparation-wet high intensity magnetic separation process. Scanning electron microscopy,EDS spectroscopy,Zeta potential and infrared spectrum measurements were used to study the micro-morphology of aggregates before and after magnetic separation and the change of surface properties of minerals after the action of reagents. The magnetic separation experimental results showed that,compared with the conventional high intensity magnetic separation,using selective agglomeration-high intensity magnetic separation process,the concentrate recovery of the presence of HPM in magnetic separation increases by 5. 39% on condition that HPM dosage is 10 g/t,pulp pH value is 10 and stirring speed is 954 r/min. The apparent particle size of mineral particles in raw ore increases significantly after adding HPM and the recovery of fine hematite can be enhanced by high intensity magnetic separation with the presence of HPM. HPM can selectively flocculate hematite,and there are electrostatic adsorption and hydrogen bond adsorption on the surface of hematite,but there is no adsorption on the surface of quartz.
引文
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[7] Weir S,Moody G M. The importance of flocculant choice w ith consideration to mixing energy to achieve efficient solid/liquid separation[J]. Mineral Engineering,2003,16(2):109-113.
[8] Grabsch A F,Fawell P D. The impact of achieving a higher aggregate density on polymer-bridging flocculation[J].International Journal of Mineral Processing,2013,124(12):83-94.
[9] Bhagyalaxmi K,Hrushikesh S,Swagat S. Investigations on different starches as depressants for iron ore flotation[J].Mineral Engineering,2013,49(8):1-6.
[10] Yan H J,Zhang B S. In vitro cytotoxicity of monodispersed hematite nanoparticles on Hek 293 cells[J]. Materials Letters,2011,65(5):815-817.
[2] Ahmad H,Behzad V H,Sabri K. Effect of bubble size and velocity on collision efficiency in chalcopyrite flotation[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2016,498(5):258-267.
[3]张晋霞,牛福生,陈淼.微细粒鲕状赤铁矿、石英的分散行为与机理研究[J].中国矿业,2015,23(5):120-125.(Zhang Jin-xia,Niu Fu-sheng,Chen Miao. Study on size characteristics and behaviors and mechanism of dispersion of fine oolitic hematite and quartz particle[J]. China Mining Magazine,2015,23(5):120-125.)
[4] Li W B,Zhou L B,Han Y X,et al. Effect of carboxymethyl starch on fine-grained hematite recovery by high-intensity magnetic separation:experimental investigation and theoretical analysis[J]. Powder Technology,2019,343(2):270-278.
[5] Schubert H. On the optimization of hydrodynamics in fine particle flotation[J]. Mineral Engineering,2008,21(12/14):930-936.
[6] Yin W Z,Yang X,Zhou D,et al. Shear hydrophobic flocculation and flotation of ultrafine Anshan hematite using sodium oleate[J]. Transtactions of Nonferrous Metals Society of China,2011,21(3):652-664.
[7] Weir S,Moody G M. The importance of flocculant choice w ith consideration to mixing energy to achieve efficient solid/liquid separation[J]. Mineral Engineering,2003,16(2):109-113.
[8] Grabsch A F,Fawell P D. The impact of achieving a higher aggregate density on polymer-bridging flocculation[J].International Journal of Mineral Processing,2013,124(12):83-94.
[9] Bhagyalaxmi K,Hrushikesh S,Swagat S. Investigations on different starches as depressants for iron ore flotation[J].Mineral Engineering,2013,49(8):1-6.
[10] Yan H J,Zhang B S. In vitro cytotoxicity of monodispersed hematite nanoparticles on Hek 293 cells[J]. Materials Letters,2011,65(5):815-817.