Mechano-chemical sulfidization of zinc oxide by grinding with sulfur and reductive additives  

氧化锌-硫磺-还原性添加剂混合粉末的机械化学硫化行为(英文)

作　　者：柴立元[1,2] 梁彦杰[1] 柯勇[1] 闵小波[1,2] 唐崇俭[1,2] 张海静[1] 谢先德[1] 袁翠玉[1] 

机构地区：[1]中南大学冶金科学与工程学院环境工程研究所,长沙410083 [2]国家重金属污染防治工程技术研究中心,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第4期1129-1138,共10页中国有色金属学报（英文版）

基　　金：Project(50925417) supported by the China National Funds for Distinguished Young Scientists;Project(50830301) supported by the National Natural Science Foundation of China;Projects(2010AA065203,2011AA061001) supported by the National High-tech Research Program of China;Project(NCET-10-0840) supported by the Program for New Century Excellent Talents in University,China

摘　　要：A novel process for sulfidation of ZnO by co-grinding with sulfur and reductive additives （P, Fe, A1, and Mg） was developed. The sulfidation extent of ZnO with the addition of P, Fe, A1 or Mg can reach 85.2%, 81.6%, 96.7% and 92.6% after grinding for 4, 6, 1 and 1 h, respectively. Based on the chemical phase composition analysis and morphological characteristics of sulfidized products by XRD, SEM and TEM, a possible reaction mechanism, mechanically induced self-propagating reaction （MSR）, was proposed to explain the sulfidization reaction. In addition, the floatability of sulfidized products was investigated for the recovery of metal sulfide and ZnS can be concentrated with a high concentration ratio and concentrate grade. By using the sulfidizing process, it is expected that the recovery of zinc from the wastes or purification of heavy-metal-containing hazardous residues is technically feasible.采用高能球磨技术研究氧化锌-硫磺-还原性添加剂(P、Fe、Al、Mg)混合粉末的机械化学硫化行为。该方法是氧化锌硫化的一种新方法。在添加P、Fe、Al、Mg的条件下,经过4、6、1、1 h的球磨,ZnO的硫化率分别达85.2%、81.6%、96.7%、92.6%。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)等分析了球磨样品的化学物相组成变化和形貌特征变化,提出了ZnO机械化学硫化的反应机制,即机械力诱发的自蔓延反应(MSR)。另外,为了实现硫化产物的浮选回收,考察了硫化产物的可浮性。结果表明,机械硫化产物中的ZnS能够通过浮选而高效富集。通过采用该硫化技术,有望实现废渣中锌的回收和重金属危险废物的净化解毒。

关 键 词：mechano-chemical sulfidization zinc oxide reductive additives self-propagating reaction FLOTATION 

分 类 号：TD952[矿业工程—选矿] TD923