Pellet composite ore grinding system and pellet composite ore grinding method

Abstract

The invention relates to a pellet composite ore grinding system and a pellet composite ore grinding method. The pellet composite ore grinding method comprises the processes of pre-batching, dry grinding, wet grinding, fine powder pre-batching, mixing of a first mixing machine, milling of a high-pressure roller, batching, mixing of a second mixing machine, pelletizing and pellet high-temperature roasting, specifically, after iron ore powder is pre-batched, 20-80% of materials are subjected to dry grinding treatment, the rest materials are subjected to wet grinding treatment, after the 20-80% ofmaterials and the rest materials are subjected to ore grinding treatment and discharging treatment, the ground materials are matched with fine powder batched in the fine powder pre-batching link to enter a first mixing machine to be mixed, and the mixed materials are subjected to milling treatment of the high-pressure roller to improve the specific surface area, or the ground materials directly enter a batching bin through a by-pass after ore grinding; and then the rolled and discharged materials are batched with bentonite, a flux and the like in a batching chamber, second-time mixing is carried out after batching, and finally pelletizing and pellet high-temperature roasting are carried out. According to the pellet composite ore grinding method, the two ore grinding processes are fused ina set of pelletizing process, and the method has the advantages that the adaptability to mineral powder types is high, high water pressure of milling of the high-pressure roller is reduced, the particle size composition of the pellet fine powder is improved, and the like, and has obvious advantages compared with the single ore grinding process.

Description

technical field [0001] The invention relates to a pellet compound grinding system and a pellet compound grinding method. Background technique [0002] Pellets are an important part of the blast furnace charge structure in the iron and steel industry. In China, pellets account for 15% of the charge structure; The lump ore has the characteristics of less pollutant discharge and low energy consumption. In recent years, with the increasing pressure of environmental protection in various places, the production of domestic sintering machines has been frequently limited, and the production line of pellets has gradually increased. In Europe and North America, pellets have long been used as the main material for their blast furnaces, and even 100% pellets have been fed into the furnace. Combined with its own resource conditions, gradually improving pellets is the development direction of domestic agglomeration. [0003] A key difference between sintering and pelletizing is the dif...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in order to overcome the shortcomings of the existing pellet grinding technology, such as high investment in wet grinding, difficulty in controlling the moisture content of the discharge material, and the influence of the uniformity of moisture differences in different materials on the operation of high-pressure roller mills, the present invention provides a pellet mill. Agglomerate compound grinding system and pellet compound grinding method realize the coupling of dry grinding and wet grinding process, greatly improving the adaptability to iron ore powder resources

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