Study On Separation Of Carbon And Iron From High Phosphorus Oolitic Hematite

Oolitic hematite is an important iron ore resource in China,mainly distributed in Hubei,Hunan,Guizhou and other areas,accounting for about 10% of the total iron ore resources in china.Oolitic ore and quartz,clay minerals,the oolitic particle center outward irregular shell,wrapped in layers,forming a multilayer structure,obvious boundaries between layer and layer of iron ore veins,and iron minerals and gangue mineral disseminated grain size is fine,it is difficult to choose one of the iron ore.But with the progress of science and technology and social development,the demand for steel products continues to expand,leading to the rapid rise of high grade iron ore prices,and domestic and foreign rich iron ore and easy mining iron ore resources are depleting,so the development and utilization of low grade oolitic hematite again to the attention and recognition.In this experiment,Guizhou Hezhang oolitic hematite ore as raw material,with graphite powder as reducing agent,heat pipe type heating furnace with high temperature by way of reduction,respectively studies the influence of reduction temperature,basicity and carbon ratio reduction and reduction factors（reduction temperature,basicity and carbon ratio）and magnetic factors（ball milling the size,size）of metallic iron magnetic separation.By means of optical microscope,SEM-EDS and chemical analysis method,studied under different conditions of sample morphology,metallization rate and phase composition,and separation of metal iron by magnetic separation,obtained under different conditions of recovering iron concentrate rate of iron,iron grade and dephosphorization rate.The results show that the reduction temperature and the ratio of carbon to carbon have a significant influence on the metallization rate.As the temperature increases,the agglomeration and growth of metal iron are favorable,and the increase of basicity increases the dephosphorization rate obviously.With the temperature,alkalinity,carbon ratio and the magnetic force increases,the iron recovery rate are improved,but the iron recovery rate decreased with decreasing particle size and ball milling.Iron grade only increases with rising temperature and other conditions are declining.The iron concentrates after magnetic separation are mainly composed of Fe and Fe₂SiO₄.The slag is mainly composed of Ca₂Al₂SiO₇ and Al₂SiO₅,and a small amount of Fe is also found in the slag.Under the condition of reduction temperature 1100,time 2h,carbon ratio 1.3 and basicity 1.5,the metallization rate was up to 87.52%.The recovery rate of iron after magnetic separation was 71.86%,the iron grade was 60.55%,and the dephosphorization rate was 48.22%.