The Iron Concentrator Tailings Yuxi Dahongshan Then Select The Pilot Study

Because the characteristics of iron ore in China is "poor, fine and miscellaneous", the vast majority of iron ore need to be fine-grounded in order to acquire high-quality concentrate. However, it is difficult to be recovered the part of the ore that the particle size too small by using the traditional craft, and a large number of fine-grained that useful minerals are discharged into the tailings. On the other hand,, the iron ore that can be exploied are less and less with the use of iron ore resources long time. So, the recycle of iron tailings has important realism meaning.In this paper, the iron tailings that Dahongshan plant were taken as the research object. The valuable elements of these tailings are iron. The Fe content was 14.56%, the main iron mineral were hematitered and accounts for 10.06%. Then there are magnetite and siderite and accounts for 2.96%. The primarily gangue mineral were quartz and feldspar, whose content was 48.47%,then there are mica, illite, chlorite, calcite, dolomite and they are bout 11.35% of the total minerals.The findings showed that the find grain content is hing in the iron tailing. Fe is mainly concentrates in+0.037mm～-0.074 mm,+0.010 mm～-0.019mm and-0.010mm,the iron distribution rates were 24.96%,14.14% and 36.96%,total 76.06%. There is a low liberation degree of the iron minerals, in the level of +0.074mm, the liberation degree only is 38%.To the level of-0.037mm, the liberation degree above 80%.According to the properties of tailings, several flowsheets were explored in this paper, such as single magnetic separation flowsheet,single gravity separation flowsheet, the joint of magnetic separation and gravity seperation The experimental study showed that the joint of magnetic separation and gravity seperation were the best of all.On the basis of the joint of magnetic separation and gravity, magnetic intensity and the Hang and Vibrate of Cone Concentrator conditional tests were carried out. It is determined that the magnetic intensity by using the process of discarding tailings with magnetic separation. the magnetic intensity is 0.91T and 0.97T of magnetic roughing and magnetic scavenging. the most suitable operating parameters for the magnetic concentrate were determined:vibration frequency was 385 rev/min; rotation period of the vibrate was 227.5 sec/turn. Then on this basis, open circuit tests were carried out. After ore by using the process of discarding tailings with magnetic separation,after one rouging and one scavenging, the concentrate of magnetic roughing and the concentrate of magnetic scavenging was process by gravity separation, the grade of Fe concentrate was 54.15% and the recovery was 28.99%, and the grade of middling was 57.13%. and the recovery was 1.00%.To improve the recovery of fine iron tailings, recleaning tests of magnetic scavenging were carried out, ain at the joint of the concentrate of magnetic roughing and the concentrate of magnetic scavenging, gravity separation was carried out, and obtain the grade of Fe concentrate was 53.38% and the recovery was 5.69%. Then on this basis, closed circuit tests were carried out and obtained a satisfactory result, When the grade of run of mine was 14.52%, the grade of Fe concentrate reached to54.02% and the recovery was 34.68%, the grade of tailings was 10.452%.