黄原胶选择性絮凝分离微细粒孔雀石和石英  

Selective Flocculation of Xanthan Gum Separates Fine-grained Malachite and Quartz

作　　者：方淑华 滕青 杨志超[1] 张长明 FANG Shuhua;TENG Qing;YANG Zhichao;ZHANG Changming(School of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学矿业工程学院,太原030024

出　　处：《有色金属（选矿部分）》2024年第6期132-144,共13页Nonferrous Metals（Mineral Processing Section）

基　　金：山西省基础研究计划(自由探索类)项目(20210302124061,202203021221052)。

摘　　要：提高微细粒氧化铜矿回收率是铜矿资源高效利用亟待解决的重要难题,研究微细粒孔雀石与石英选择性絮凝分离对高效回收铜矿资源具有重要意义。以黄原胶为絮凝剂,研究了其对孔雀石和石英的选择性絮凝沉降行为及作用机理。结果表明,在pH值为4、黄原胶浓度为10 mg/L、Cu^(2+)浓度为20 mg/L时,可获得单矿物孔雀石回收率91.81%,两种矿物沉降率差值为64.73个百分点,混合矿沉降率66.61%,孔雀石回收率72.44%和Cu品位30.18%的良好指标。显微镜观察结果证实,黄原胶对孔雀石的吸附量强于石英,黄原胶能够选择性絮凝孔雀石,使其团聚成大粒径絮团,有利于矿物沉降;吸附量测定和Zeta电位分析表明,黄原胶与孔雀石之间存在静电作用,与石英之间存在物理吸附作用,Cu^(2+)会与覆盖在石英表面上黄原胶发生静电作用,与石英作用较小;FTIR测试结果表明,黄原胶能够吸附在孔雀石表面发生化学反应,加入Cu^(2+)和黄原胶作用后,黄原胶与孔雀石之间存在氢键作用,黄原胶还可以络合Cu^(2+)形成稳定的络合物。黄原胶与石英之间主要是物理吸附作用;XPS测试结果表明,黄原胶与孔雀石表面Cu^(2+)发生吸附作用,与孔雀石表面Cu位点键合,从孔雀石-OH和C=O基团得到电子。黄原胶与石英之间吸附作用较弱。黄原胶能够有效实现孔雀石与石英两者分离,并提高孔雀石品位,为微细粒孔雀石的回收利用提供理论指导。Improving the recovery of fine copper oxides is an important problem to be solved in the efficient utilization of copper ore resources.It is of great significance to study the selective flocculation separation of fine malachite and quartz for efficient recovery of copper ore resources.Using xanthan gum as flocculant,the selective flocculation and settlement behavior of malachite and quartz were studied.The results show that when pH value is 4,xanthan gum concentration is 10 mg/L,Cu^(2+)concentration is 20mg/L,the recovery of single mineral malachite is 91.81%,the difference of settlement rate between the two minerals is 64.73percentage points,the settlement rate of the minerals mixture is 66.61%,the recovery malachite is 72.44%and the Cu grade is 30.18%.The results of microscope observation show that the adsorption capacity of xanthan gum for malachite is stronger than that of quartz.Xanthan gum can selectively flocculate fine malachite particles and agglomerate them into large size of particle flocs,which is conducive to settlement.The determination of adsorption capacity and Zeta potential analysis showed that xanthan gum had electrostatic interaction with malachite and physical adsorption with quartz,and Cu^(2+)would have electrostatic interaction with xanthan gum covered on the surface of quartz,but had little effect with quartz;The results of FTIR test show that xanthan gum can be adsorbed on malachite surface for chemical reaction.When Cu^(2+)and xanthan gum are added,there is hydrogen bond between xanthan gum and malachite,and xanthan gum can also form stable complex of Cu^(2+).The interaction between xanthan gum and quartz is mainly physical adsorption.XPS test results showed that xanthan gum adsorbed Cu^(2+)on malachite surface,bonded to Cu site on malachite surface,and obtained electrons from malachite-OH and C=O groups.The adsorption between xanthan gum and quartz is weak.Xanthan gum can effectively separate malachite from quartz,improve the grade of malachite product.This study provides theoretical gu

关 键 词：黄原胶 孔雀石 石英 选择性絮凝 絮凝剂 

分 类 号：TD926[矿业工程—选矿]