Separation Of Zinc Hydrometallurgy Process, Zinc, Iron And Iron Resource Use

Aimed at value-added utilization of iron resource in sphalerite concentrate and complete elimination of environmental pollution caused by waste ferric residue heaping, a new process for iron-zinc separation and iron resource utilization was proposed in present dissertation. Using the process of "leaching--reduction by zinc concentrate--cementation for copper removal--neutralizing for precipitation of indium--deep cleaning-separate zinc and iron with hydrothermal method--prepare Mn-Zn soft magnetic ferrite" to deal with the high-leaching residue produced by Laibin smelter. Theoretical and technical studies were carried out in detail and some meaningful conclusions were obtained.The experimental results show that the leaching ratio of Zn, Fe and In is higher than 96% by pretreat the high-leaching residue with sulfation roasting befor leaching. Using sphalerite concentrate as reductive reagent, the reduction ratio of Fe3+is 96.25%. The removing ratio of Cu2+ is 99.7% in the process of iron powder cementation. And the content of Fe3+ reduced to less than 0.2g·L-1. When neutralization precipitating indium using basic zinc carbonate as neutralizer, the average precipitation ratio of indium is about 96.55%.The average content of indium in In-enriched residue was more than 3%. After deep purification, the content of Si reduced to 0.008g·L-1. The precipitation ratio of iron can reach 90.73% by hydrothermal method. Sulfuric acid is vegenerated simultaneously and recycled back to acid leaching operation. After water washing and calcinations, hematite powder obtained meets the requirement of YHT3 level of ferric oxide used as soft magnetic ferrite raw materials. It can be used to prepare lower losses Mn-Zn soft magnetic ferrite. The average initial permeability of the lower losses Mn-Zn soft magnetic ferrite meets PC40 and PC30 product quality standards of the TDK Company.