Sinter production method for reducing sintering solid burnup and enhancing intensity

Abstract

The invention provides a sinter production method for reducing sintering solid burnup and enhancing intensity, which comprises the steps of preparing materials, mixing and pelletizing, distributing materials and sintering. The sinter production method is characterized in that coke powder for sintering is pulverized and prescreened before material preparation; the coke powder is screened into 4 granularity levels: the granularity level less than 1mm, the granularity level of 1 to 3mm, the granularity level of 3 to 5mm and the granularity level larger than 5mm, mixed according to the weight percentages of 55% to 59% of the granularity level less than 1mm, 23% to 27% of the granularity level of 1 to 3mm, 9% to 13% of the granularity level of 3 to 5mm and 4% to 8% of the granularity level larger than 5mm and then prepared with other raw materials. The sinter production method can promote solid fuels to be reasonably burned in the process of sintering; the mineralization processes of iron ores, fusing agents and fuels are reasonable; the sinter intensity is remarkably enhanced; and the sinter solid burnup is obviously reduced. An experiment indicates that the sintering tumbler strengthis enhanced by 1.26%, the solid burnup is reduced by 1.89kg / t and the finished product ratio is enhanced by 4.28% than that of the prior art.

Description

technical field [0001] The invention belongs to the technical field of sintering, in particular to a production method of sintered ore for blast furnace ironmaking. Background technique [0002] The existing sinter production process is: mix the prepared iron concentrate powder, rich ore powder, blast furnace dust, steel rolling skin, limestone, dolomite, coke powder or anthracite powder according to the calculated ratio and send them to the mixer for mixing. Homogenize and granulate; the mixed material is spread on the trolley by the distributor for ignition and sintering. The burnt sintered ore is crushed by the single-roller crusher at the end of the machine, and then sent to the cooler for cooling after being screened. The cooled finished sinter is sent to the blast furnace. [0003] The solid fuel used for sintering is coke powder or anthracite, and its incoming fuel is usually 0-25mm. The sintering process requires that 0-3 mm should account for more than 80%-85% of...

AI Technical Summary

Problems solved by technology

For example, the technical description of "the content of 2-3mm should be more than 17%" is relatively vague. Laboratory experiments have shown that too much content of 2-3mm will have a great adverse effect on the quality index of sintering production, so "the content of 2-3mm should be The description of "more than 17%" is unscientific; similarly, for "0-1mm and 1-2mm particle size content should be greater than 34%" there is also a question of how much greater than 34% is better, because 0-1mm and 1mm After the ~2mm particle size content reaches a certain level, the sintering product quality index begins to deteriorate

[0006] In a word, because the existing technology is not clear about the optimal proportion of each subdivided particle size (5mm particle size) in the sintered fuel to account for the best proportion of the fuel, it cannot be directly Quantitatively give the best fuel particle size range and the reasonable ratio of each particle size in the fuel. In production, we can only adjust the working conditions of the sintering crusher based on our own sintering production experience to change the particle size of the fuel at the outlet of the crusher. This kind of extensive The particle size control method leads to unreasonable combustion of sintered solid fuel in the sintered material layer, which has an adverse effect on the improvement of sintered minerals and quality indicators

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