Study On The Hydrothermal Hematite Method Of Iron Precipitation In FeSO₄-ZnSO₄-H₂O System

In recent years,my research team has developed a new economic and efficient technology for the mineralogical characteristics of sphalerite.The process mainly includes reduction leaching,replacement of copper,neutralization indium,hematite and other processes,so as to achieve the efficient recovery of valuable metals in zinc concentrate and the resource utilization of associated iron.In this paper,the study of Fe?II?oxidation of hematite was carried out in the FeSO₄-ZnSO₄-H₂O system with the indium precipitate produced by the neutralization and indium process in the new process,and the following conclusions were obtained.?1?in the Fe SO₄-ZnSO₄-H₂O system,the influence of temperature,time,crystal amount,Zn²⁺concentration,oxygen partial pressure and stirring rate on the iron deposit rate and iron slag phase of Fe?II?oxidized hematite was studied.The results show that the temperature is the key factor affecting the formation and transformation of the metastable ferric oxide phase.The thermodynamic stability of the elevated temperature metastable ferric oxide phase is reduced and transformed into hematite,and the increase of Zn²⁺concentration,the increase of the oxygen partial pressure,the addition of the seeds and the agitation speed will promote the thermal hydrolysis of Fe?II?oxidation water to hematite.?2?under the optimum technical parameters of the reaction temperature 190,zinc ion concentration 100g/L,crystal seed dosage 30g,reaction time 4h,oxygen partial pressure 0.6MPa and stirring speed 500r/min,the iron removal rate of Fe?II?oxidation water in FeSO₄-ZnSO₄-H₂O system is 95%in the process of hot hydrolysis of red iron ore by Fe?II?oxidation water,and a pure hematite deposit with 58.3%iron particles containing iron is obtained.Slag.?3?Fe₂O₃ seed is the key factor that affects Fe?II?oxidation and hydrothermal hydrolysis of hematite.The promotion effect of Fe₂O₃ seed on iron precipitation in hydrothermal hematite was studied in FeSO₄-ZnSO₄-H₂O system.The results showed that adding seed crystal could reduce reaction temperature and shorten reaction time.?4?under the optimum conditions of the dosage of 26 g/L,the concentration of zinc ion,the reaction temperature 190,the reaction time 3h and the oxygen partial pressure 0.6MPa,the iron removal rate of Fe?II?oxidation water hot hydrolytic hematite process is 91.84%,and the large particles and more pure red iron slag is obtained.