With the rapid development of steel industry, domestic iron ore demand Mengjin, triggered a surge in the world price of iron ore and iron ore resources easy to choose our country is facing a growing shortage situation, in this situation, how It is of great practical significance to develop and utilize a large number of poor, fine and miscellaneous red ore resources in China by using advanced mineral processing equipment and beneficiation technology. In this paper, for the fine-grained hematite in a certain area, the mineral characteristics can be rooted. The ore can be treated by two-stage continuous grinding, one coarse and one sweep, two-stage strong magnetic separation and an anion reverse flotation process, and the ideal one is obtained. Other indicators.
I. Multi-element and phase analysis of ore chemistry
1. The results of chemical multi-element analysis of ore are as follows:
2. The results of the phase analysis of the ore are as follows:
From the results of chemical multi-element analysis of ore and the phase analysis of ore, the original ore grade is only 30.43%, and its mineral composition is single. The iron mineral is mainly red limonite, accounting for 96.71 of iron mineral composition. It contains a small amount of magnetic iron, iron carbonate and iron tart iron mineral. The gangue mineral is mainly quartz . The harmful element sulfur content is relatively low, but the phosphorus content is 0.16%, which exceeds the smelting requirements.
2. Process mineralogy characteristics Experts in the ore dressing process of the ore show that the ore is a lithic breccia and iron sandstone of the sedimentary facies, and its iron mineral composition is relatively simple, mainly hematite, goethite and Most of the limonite and hematite are cryptocrystalline and silicified and filled between breccia and gravel mainly composed of quartz and feldspar . The goethite crystal grain size is fine and the limonite content is less. The gangue minerals are mainly quartz, albite, and micro-plagioclase, and contain a very small amount of carbonate minerals.
The ore structure is complex, especially the filling structure of ferrosilicon cement. Such ore minerals are difficult to dissociate, and the ore structure is dominated by dense block and breccia. The particle size distribution of iron mineral inlay in the ore sample is biased toward the fine particle size. The average inlaid particle size was 15.78 μm, and the logarithm of the gangue mineral inlaid grain size was normally distributed, and the average inlaid particle size was 46.16 μm.
3. Determination of relative grinding degree of ore We can use the dry ball mill to carry out the relative grindability test of iron ore with different grinding time. The relative grindability curve of the ore according to the fixed result is shown in the following figure. The ore is easier to grind than the Donganshan ore.
4. Determination of the dissociation degree of different grinding grain sizes. The representative ore samples were ground to -200 mesh, 70%, 90%, 95%, and 3 sizes of grinding products for particle size analysis and dissociation measurement. The following table:
From the above analysis of the particle size analysis and dissociation measurement results of different grinding fineness products, as the grinding particle size gradually becomes finer, the monomer dissociation degree of iron minerals and gangue minerals gradually increases, but Because the ore structure is mostly cemented filling structure, cryptocrystalline structure and inclusion structure, its mineral is difficult to dissociate from monomer, the average particle size of iron mineral and gangue mineral is lower, and it is muddy in the grinding process with ball mill. The phenomenon is very serious. When the ore is ground by a ball mill with a particle size of -200 mesh and 95%, the yield of the -10 μm particle size grade has reached 64.10%. From the results of the measurement, we can see that in order to achieve a better dissociation of the iron minerals of the ore, it must be finely ground by an ultrafine ball mill, but since the ore is easily muddy, the fineness of grinding must be appropriate. According to the measurement result of the measurement result chart, it is determined that the suitable grinding grain size of the ore is about -200 mesh and accounts for about 90%.
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