磺化聚丙烯酰胺在钛铁矿和长石上的吸附特性与絮凝行为

来源期刊：中南大学学报(自然科学版)1986年第6期

论文作者：陈荩 陈万雄 徐正和

文章页码：86 - 93

关键词：絮凝； 吸附； 絮凝剂； 磺化聚丙烯酰胺； 钛铁矿

Key words：Flocculation； Adsorption； Flocculent； Sulphonated Polyacrylamide

摘    要：用凝胶渗透色谱法(GPC)研究了人工合成高聚物磺化聚丙烯酰胺(PAMS)在微细粒钛铁矿和长石上的吸附特性及它们的絮凝行为;用光电子能谱(ESCA)和分子轨道(MO)理论研究了絮凝剂PAMS与钛铁矿和长石的作用机理;并根据絮凝剂与矿物作用的差别进行了微细粒钛铁矿、钒钛磁铁矿、长石矿料的絮凝分离试验。PAMS在矿物表面上的吸附量与其平衡浓度有线性关系。吸附量随平衡浓度增加而增加。在钛铁矿上的吸附量及吸附强度均比长石大。分子轨道理论分析和光电子能谱证实PAMS的磺酸基在钛铁矿表面与过渡金属离子形成络合物;而在长石上是弱氢键作用。采用一种新的工艺流程:选择性混合絮凝-磁选-超声波解絮凝-磁选可从含20.35%TiO₂及29.7%Fe的物料中选出钛铁矿精矿和钒钛磁铁矿精矿,品位分别为42.12%TiO₂,58.10%Fe;回收率相应为83%及90%。

Abstract: The adsorption of Sulphonated polyacrylamide（PAMS）on ilmenite and feldspar fromaqueous solution and the floeculation of minerals by PAMS have been studied.The researchresults reveal that the strong adsorption of PAMS on ilmenite results in its strongflocculation and the weak adsorption of PAMS on feldspar causes its dispersion to be morestable.The mechanism of PAMS bonding is discussed in terms of co-ordination and H-bonding interaction respectively in the light of molecular orbit.The co-ordination between—So₃^- on PAMS chain and sites of Ti⁴⁺ or Fe²⁺ on ilmenite was testified by electron spec-troscopy（PHI550ESCA/AES）.Consequently new technology“Bulk flocculation-magneticsepa-ration-ultrasonic deflocculation-magnetic separation”for fine ilmenite/titano-magnetite/feld-spar system has been successfully developed.