Effect of Vertical Iron Refiner on Pellet Quality Improvement|Professional Iron Concentrate Vertical Roller Mill Supplier

Pellet is a high-quality raw material for blast furnace ironmaking, and its quality performance is increasingly valued by the industry. High quality pellet has high requirements for iron concentrate, grinding fineness and concentrate grade. High concentrate grade and grinding fineness both increase the cost of beneficiation process, so the iron ore beneficiation technology and cost directly affect the development of pellets. How to improve the beneficiation process, not only meet the fineness and quality of concentrate, but also reduce the production cost of concentrator is an important research direction of beneficiation process. As a manufacturer of iron concentrate vertical roller mill and iron powder grinding mill, HCMilling(Guilin Hongcheng) will introduce the role of iron concentrate vertical roller mill in improving pellet quality.

HLM iron concentrate vertical roller mill

Because pelletizing has requirements not only on the grade of concentrate powder, but also on the fineness of concentrate powder, which often needs to reach 0.074mm particle size content of ≥ 90%, which can be achieved by using two-stage grinding in production, and because iron minerals in iron ore are often embedded with uneven particle size, there are often different degrees of under-grinding or over-grinding in actual production, resulting in the grade of concentrate powder can not meet the requirements, and the fineness of concentrate powder is also difficult to ensure, It affects the quality of pellets in subsequent operations. After being used as raw material for pelletizing production, its physical properties of pelletizing are not ideal. In order to ensure that the physical and chemical indexes and thermal indexes of pellets meet the standards of ironmaking raw materials, and at the same time extend the time of rotary kiln agglomeration, and reduce the amount of binder added, the proportion of hematite concentrate is generally controlled below 50% in pelletizing production. For mining enterprises rich in poor hematite resources, in order to comprehensively utilize hematite resources, it is imperative to further improve the proportion of hematite concentrate in pellet raw materials. Liu Changjiang, the inventor of China's Anshan Iron and Steel Group, provided a grinding and dressing process for producing pellet raw iron concentrate powder by using a iron concentrate vertical roller mill, which meets the requirements of pellet for high grade (tfe≥67%) and high fineness (0.074mm≥90%) of iron concentrate powder raw material, and also solves the problems of difficult quality assurance, serious over-grinding and high production cost of iron concentrate powder used for pellet production.

The grinding and separation process flow of the iron concentrate vertical roller mill to produce the pellet raw material iron concentrate is as follows: 1) The concentrated concentrate with the concentration of 60% after concentration of the gravity concentrate with the TFe grade of 67~67.5%, accounting for 40~50% of the total concentrate, and the particle size of -0.074mm accounting for 70~80% of the total concentrate, is fed into the vertical iron concentrate grinder-cyclone grading closed circuit operation, 2)The fine products of the vertical iron concentrate grinder-cyclone grading closed-circuit operation and the TFe grade of 67.5~68% are mixed with the flotation concentrate and then fed into the thickener before filtration for concentration. The overflow of the thickener is reused as circulating water. The concentration of the thickener underflow is 50~60%, and the mixed hematite concentrate with a particle size content of -0.074mm greater than 90% is fed into the filter for dehydration, and the water content of the final mixed hematite concentrate is controlled below 9.5%. The effect of iron concentrate vertical roller mill on pellet quality improvement: effectively improve the content of fine particles in mixed hematite concentrate, increase the specific surface area of hematite concentrate, and further increase the consumption of hematite concentrate, from less than 50% to more than 60%.

HCMilling(Guilin Hongcheng) is a manufacturer of iron concentrate vertical roller mill. Our HLM series iron concentrate vertical roller mill is widely used in pellet production. The processing fineness of 80-600 mesh can be adjusted infinitely. There is no need to add water in the production process. It belongs to dry grinding equipment. Models with output ranging from ten tons to hundreds of tons can be selected. If you have relevant production and purchase requirements for iron powder grinding mill, please contact us for details of equipment.