Wet open-circuit mix grinding process of pellet raw materials
A technology for raw materials and pellets, which is applied in the field of open-circuit wet mixed milling of raw materials for pellets, can solve the problems of impact on pelleting, various types of equipment, and large floor space, so as to reduce the number of operators, reduce factory investment, and improve manufacturing. The effect of the block effect
Inactive Publication Date: 2012-07-25
BEIJING SHOUGANG INT ENG TECH
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Problems solved by technology
At present, ball mills are generally used in China to grind iron ore powder separately in open or closed circuits, and separate vertical mills are used to produce flux powder and fuel powder respectively.
The flux and fuel produced by the vertical mill are dry powder with a moisture content of less than 1%. During the drying process, the water is discharged into the atmosphere, and the corresponding production water consumption increases. The dust is large during the batching process, and the humidification effect during mixing is not good, which will affect the pelletization. have an impact
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[0011] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0012] figure 2 The raw material open-circuit wet mixing grinding process adopted for a certain pellet, the specific process is as follows: according to the set amount of material, the iron ore powder passes through the φ2.5m disc feeder 6 and the B915mm weighing feeder 5 under the mine, and the dolomite , Limestone, anthracite and steel mill waste are fed to the B1000mm1# belt conveyor 3 through the B762mm quantitative feeder 3 under the bin, and then fed into the φ5.5m×11m ball mill 4. In the ball mill, the mixed material and water are ground into ore slurry, and then the steel balls are removed by the cylindrical sieve and then discharged into the pump box 7. The pump box 7 is equipped with two stirring tank feed pumps 8 to pump the pulp into the 1# pulp distributor 11, and then controlled by the 1# pulp distributor 11 to feed into the φ10...
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The invention relates to a wet open-circuit mix grinding process of pellet raw materials, belonging to the technical field of processing of blast furnace pellet and DRI (direct reduced iron) pellet raw materials. The process comprises the following steps: compounding the pellet raw materials including iron ore powders, a flux, a fuel-burdened material, and wastes from steel works according to a certain weight; feeding the mixture into an overflow ball mill; then flowing milled ore pulp into a pump box, and pumping into a agitating tank through a variable frequency pump; and transferring the ore pulp from the agitating tank into an ore pulp distributer of a filter by a slurry pump and feeding into the filter for filtering by control of the ore pulp distributer. The water added to a production process can be recycled and the process is automatically controlled. The open-circuit mix grinding process of the pellet raw materials, provided by the invention, has the advantages of simplifying the procedures and saving space and investment, and moreover, the pellet raw materials are pre-mixed, so that the use amount of adhesive is reduced, and the pelletizing effect is improved.
Description
technical field [0001] The invention belongs to the technical field of raw material treatment of blast furnace pellets and DRI pellets, and in particular provides an open-circuit wet mixed grinding process for pellet raw materials, which can reduce the granularity of pellet raw materials. Background technique [0002] As the proportion of pellets in the blast furnace charge increases, the alkalinity of the pellets must also increase, and a part of flux must be added to the raw materials of the pellets. At present, the iron raw material of the new pellet production line is mainly hematite. In order to increase the porosity and reducibility of the finished pellets, reduce the total fuel consumption, the operating temperature of the grate plate and the power consumption of the fan, generally in the pellets A small amount of fuel is added to the group raw materials. Scrap from integrated steel mills is generally also fed into pellet production as raw material. At present, ball...
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IPC IPC(8): C22B1/24B02C17/00
Inventor 张卫华李长兴耿震唐佳润陈伟田王琨王丽颖
Owner BEIJING SHOUGANG INT ENG TECH