Decomposition Of Iron, Zinc And Iron Resources Comprehensive Utilization Technology

With the continuous depletion of low iron zinc resources, the development of marmatite processing technologies has become one of the hot topics of today's. Reserves of marmatite are more abundant in China, there are more than 700 million tons alone in Yunnan Province. Therefore, the development of marmatite has been gradually put on the agenda of mineral processing and gradually attracts people's attention.Based on reading lots of the fire and hydrometallurgy references, the author discussed the status of marmatite leaching, properties of the thermodynamics and each factors of kinetics at home and abroad. The author also described the principle of decomposition of zinc ferrite and combined the traditional metallurgical technology and new technology to achieve the purpose of simplifying processes and improve the leaching rate of zinc and utilization of the iron resources.This paper studied oxidizing and reduction roasting of the marmatite-oxide calcine at high temperature. The author leached the calcined product, made zinc ions the greatest degree into the leaching solution and left the iron ions as much as possible stay in the zinc leached residue, then did the magnetic separation to it. Reduction roasting temperature, time, the amount of calcined coal were separately investigated, the influence on the leaching rate of iron and zinc by acidity of leaching solution, leaching temperature, liquid-solid ratio of leaching solution and leaching reaction time were studied. The best process condition was verified by comparing the test as following: reduction roasting temperature was 900℃, reduction roasting time was 60min, the amount of coal was of 10% of the calcine quality, the leaching liquid PH was 2-3, the leaching temperature was 70℃-80℃; leaching solid-liquid ratio was 6/1 and the leaching reaction time was 120min. Under these conditions, most of the zinc ferrite resolved, the zinc leaching rate was about 90%, the iron leaching rate was about 13%, the iron content of the leaching residue was around 40%, and the iron concentrate of 60% content could reach to 60% after simple treatment. Based on the experiments, the author studied the process technology of reduction roasting-acid leaching to the marmatite-oxide calcine, which not only improved the leaching rate of zinc, but also protected iron element. Leaching solution can be used as zinc electrolyte after removing impurity treatment and then it was treated by magnetic separation. The XRD of diffraction analysis shows that:the iron existed mainly in the form of Fe3O4, Fe2O3, and ZnO·Fe2O3, they can be used as iron-making raw materials after removing impurity.The iron in marmatite could be used effectively in many forms, such as magnetite, hematite, zinc ferrite to eliminate the iron slag pollution on the environment.