| JISCO Jingtieshan V ore body is a typical refractory weak magnetic separation iron ore.Its raw iron grade is only about 23%,which is about 10% lower than other ore bodies in the same mine.The grade directly selected is too low,making subsequent beneficiation Efficiency decreases and operating costs increase,so effective preselection must be carried out.At this stage,the pre-selection method used by JISCO is strong magnetic pre-selection.However,due to the low iron grade of the raw ore of V ore body,it is difficult to meet the selection requirements with a single strong magnetic pre-selection method.Therefore,a more efficient pre-selection method is needed to select it..Intelligent pre-selection is an emerging technology that uses the properties and differences of different mineral components to efficiently pre-select minerals.It has been applied to lead-zinc ore,tungsten ore,antimony ore and other minerals.It has certain feasibility for the pre-selection of iron ore.Therefore,this study takes the refractory V ore body of Jingtieshan JISCO as the research object,and conducts a single intelligent pre-selection test study,a single strong magnetic pre-selection test study,and a joint test study of intelligent pre-selection and strong magnetic pre-selection.The results are as follows in conclusion:1.For a single intelligent pre-selection process test,when the waste rate of the stable test of 15-45 mm ore samples is 19.58%,the tailings grade of 11.99%,the metal recovery rate of 90.15%,and the grade increase of 2.89 percentage points can be obtained;45-100 mm ore When the waste rate of the sample stability test is 16.10%,the tailings grade is 11.05%,the metal recovery rate is 92.57%,and the grade is increased by 2.48 percentage points;when the waste rate of the 15-100 mm mineral sample stability test is 16.92%,it can be obtained.The tailings grade is 11.08%,the metal recovery rate is 92.13%,and the grade is increased by 2.59%.The grades of the concentrates obtained in the experiment are all about 26%,which is difficult to meet the requirements of the milling grade,and the intelligent pre-selection has a relatively general effect on the separation of fine-grained ore.It can be seen that a single intelligent pre-selection has certain limitations.2.Through a single strong magnetic pre-selection process test,the grade of iron ore concentrate has been improved obviously after the best conditions are used for each size of the raw ore.For the raw materials of 3-15,15-30 mm and 30-45 mm,the iron concentrate grade obtained by the second sweep is lower than the selected grade,and the increase in the overall iron grade is reduced after the incorporation process.Therefore,the two The one-time sweeping process for single-size raw materials is more beneficial to the improvement of iron grade;for 0-3mm-size raw materials,the grade of iron concentrate obtained due to its optimal conditions is comparable to that of raw ore.It has not been significantly improved,and this part of the fine-grained raw materials increases the cost of magnetic separation,so this part of the material does not enter the test process and is directly discarded,which can save costs and increase the overall iron concentrate grade..However,the strong magnetic pre-selection requires finer particle size of the selected raw ore,and the separation effect of the large lumpy ore is poor.The single strong magnetic pre-selection also has certain limitations on the separation effect of the raw materials.3.For the combined process test of intelligent pre-selection and strong magnetic pre-selection,the 30-45 mm raw material is 238 mm after the separation partition position is determined,and the surface line speed of the rough and sweeping cylinders is 0.70m/s and 0.60m/s respectively.Compared with the single intelligent pre-selection process,the iron ore concentrate grade has increased by 2.04%;the 30-45 mm raw material is 238 mm in the position of the separation partition,and the surface line speed of the rough and sweeping operations is 0.85m/s respectively.After 0.70m/s,compared with a single intelligent pre-selection process,the iron ore concentrate grade has increased by 1.54%.It shows that the grade of the iron ore concentrate obtained is still improved after intelligent pre-selection of raw ore and then strong magnetic preselection.The combined process of intelligent pre-selection and strong magnetic preselection has a better pre-selection effect than a single pre-selection process.After the combined process selection,the iron grade of the raw ore can be increased to more than28%,which basically meets the requirement of the iron grade for grinding,and the combined selection process has a relatively good classification effect for the raw ore of each size,so the joint pre-selection process Compared with a single pre-selection process,it has irreplaceable superiority and efficiency. |
PDF Full Text Request