核桃壳基活性炭在硫化铜镍矿浮选分离中的应用  

Application of walnut shell-based activated carbon in flotation separation of copper-nickel sulfide ore

作　　者：曹杨[1,2] 孙磊 汪清清[1,2] 王鑫[1,2] 乔毅 孙伟[1,2] 彭再华 CAO Yang;SUN Lei;WANG Qing-qing;WANG Xin;QIAO Yi;SUN Wei;PENG Zai-hua(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China;Hunan International Joint Research Center for Efficient and Clean Utilization of Critical Metal Mineral Resources,Central South University,Changsha 410083,China;Western Mining Group Co.,Ltd.,Xining 810003,China)

机构地区：[1]中南大学资源加工与生物工程学院,长沙410083 [2]中南大学湖南省关键金属矿产资源高效清洁利用国际联合研究中心,长沙410083 [3]西部矿业集团有限公司,西宁810003

出　　处：《中国有色金属学报》2023年第7期2339-2346,共8页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51904338);湖南省自然科学基金资助项目(2020JJ5746);国家重点研发计划资助项目(2020YFC1909202)。

摘　　要：硫化铜镍矿的浮选常采用“铜镍混浮−铜镍分离”的工艺流程,但铜镍混浮矿浆中的金属离子以及有机药剂的残余会影响铜镍的分离效果。本文选用核桃壳为原料,化学改性制备活性炭,研究核桃壳基活性炭对这些残留物的去除效果。研究表明,核桃壳基活性炭H_(2)SO_(4)/AC对Cu^(2+)、Mg^(2+)以及乙基黄原酸钠具有较强的吸附能力,并且吸附过程满足准二级动力学方程。在浮选试验中,与常规活性炭相比,H_(2)SO_(4)/AC能显著改善铜镍的分离效果。铜精矿中镍品位从4.25%降至0.22%,镍精矿中铜品位从0.66%降低至0.21%,此外,铜和镍的回收率也分别提高了8.21%和4.56%。The common flotation process for copper-nickel sulfide ore is copper-nickel bulk flotation followed by copper-nickel separation.However,residual metal ions and organic reagents from the bulk flotation pulp can adversely affect the separation efficiency of copper and nickel.This study utilized walnut shells as raw materials to chemically modify and produce activated carbon,aiming to investigate its efficacy in removing these residues.The results shows that the walnut-based activated carbons H_(2)SO_(4)/AC exhibit favorable adsorption capacities for Cu^(2+),Mg^(2+),and ethyl xanthogenate.Moreover,the adsorption process fits the pseudo-second-order kinetics.In the flotation experiments,compared to conventional activated carbon,H_(2)SO_(4)/AC significantly improves the separation efficiency of copper and nickel.The nickel grade in the copper concentrate reduces from 4.25%to 0.22%,and the copper grade in the nickel concentrate drops from 0.66%to 0.21%.Additionally,the recovery rates of copper and nickel increase by 8.21%and 4.56%,respectively.

关 键 词：硫化铜镍矿 铜镍分离 核桃壳 活性炭 

分 类 号：TD95[矿业工程—选矿]