Preparation Of Mn-Zn Soft Ferrite From Potassium Jarosite’s Slag

To realize economic sustainable development goals, It must always pay attentionto deal with the relationship of the economic development and population, resources,environment. Mn-Zn ferrites powders were synthesized by co-precipitation methodusing jarosite residues of the Northwest Zinc Leaching Factory as materials. Mn-Znferrite is the key materials of modern electronic industry and information indus-try.With the rapid development of telecommunication and computer technology,Mn-Zn ferrite is required for mass production. If high quality soft magnetic ferritepowders can be prepared from jarosite residues, the waste slag recycling process,having great benefits to society and the economy, will be an environmentallyacceptable technology. MnZn soft magnetic ferrite powders which were preparedthrough the process of hot-acid leaching, reducing, purification and co-precipitation byjarosite residues as materials, finally were made into the soft MnZn ferrite, as well asCo doping process. The following researches have been carried out:Using the jarosite residues as raw material, by thermal acid leaching process, ironpowder reduction process, sulfurration precipitation process and fluorinationprecipitation process, to prepara with main body MeSO₄solution of the iron and zincelements, In the whole process Fe and Zn leaching rate of up to90%, the removal rateof Cu, Cd, Ca, Mg up to99%、98%、92%and89%, reached the experimentalrequirements.It is can be conclused from the above prepared MeSO₄solution which is same astheory propotion, and from co-precipitation experiment with NH₄HCO₃precipitationagent: filling pure material rate is low （don’t consider manganese）, the metal ions inpure rate is1%, average fill pure rate is only0.36%, and total precipitationcomprehensive experiments show that, three kinds of main body of iron Zn²⁺, Mn²⁺and Fe²⁺precipitation rate is higher, sink points of main component ratio of manganesezinc ferrite accord with the actual ratio of theory, the relative error value are controlledin degree is within±5%around.Made the preparation of heavy ferrite powder into the final product through theMnZn ferrites process, experimental results showed that the density of the embryos,the pre-sintering temperature, sintering temperature, holding time sintering processwill be effect to microscopic structure of Mn-Zn ferrite, starting the microstructure ofthe magnetic conductivity and other magnetic properties. Finally, the determinedsintering process conditions is: the pre-sintering temperature is950℃, the density ofthe embryos is3.2g/cm³, sintering temperature is1220℃, holding time for2h, Co doping is1.5%and in this conditions the products magnetized strength reach to58emu/g, the initial magnetic conductance to3632, coercive force to21.79Oe.