摘要
Zinc leaching residue(ZLR) contains high content of valuable metals such as zinc and iron. However, zinc and iron mainly exist in the form of zinc ferrite, which are difficult to separate and recover. This study proposed a new process involving sulfidation roasting, magnetic separation and flotation to recover zinc and iron in ZLR. Through sulfidation roasting of ZLR with pyrite, zinc and iron were converted into ZnS and Fe3 O4. The effects of pyrite dosage, roasting temperature and roasting time on the sulfidation of zinc in ZLR were investigated. The results showed that the sulfidation percentage of zinc reached 91.8% under the optimum condition. Besides, it was found that ball-milling was favorable for the separation and recovery of zinc and iron in sulfidation products. After ball-milling pretreatment, iron and zinc were enriched from sulfidation products by magnetic separation and flotation. The grade of iron in magnetic concentrates was 52.3% and the grade of zinc in flotation concentrates was 31.7%, which realized the recovery of resources.
锌浸渣中含有大量锌、铁等有价金属,但其中锌和铁主要以铁酸锌等复杂物相形式赋存,难以分离和回收。本研究提出了涉及硫化焙烧、磁选和浮选方法回收锌浸渣中锌和铁的新工艺。以黄铁矿为硫化剂对锌浸渣进行硫化焙烧,将锌和铁分别转化为硫化锌和四氧化三铁。研究了焙烧温度、焙烧时间及黄铁矿添加量对锌浸渣中锌的硫化转化的影响。结果表明,在最佳工艺条件下,锌浸渣中锌的硫化率可达91.8%。此外,研究发现球磨有利于硫化产物中锌、铁的分离和回收。球磨预处理后,通过磁选和浮选实现硫化产物中铁和锌的富集。铁精矿铁品位达52.3%,锌精矿锌品位达31.7%。可见,该方法有效地实现了锌浸渣中锌和铁的分离与回收。
基金
Project(2018YFC1900305)supported by the National Key R&D Program of China
Project(51825403)supported by the National Science Foundation for Distinguished Young Scholars,China
Projects(51634010,51474247,51904354)supported by the National Natural Science Foundation of China
Project(2019SK2291)supported by the Key Research and Development Program of Hunan Province,China。
