Converter sinter sizing process and sintering machine screening and sizing machine for converter

Abstract

The invention discloses a revolving furnace sintering ore granulating technology and a sintering machine screening granulating machine for a revolving furnace. The technology comprises the finished sintering ore screening step that finished sintering ore is screened, and the sintering ore with the granulometric class ranging from 5 mm to 11 mm is selected as a blowing cooling agent; the conveying step that when the amount of the screened-out sintering ore is smaller than the number of materials used for the revolving furnace, all the screened-out sintering ore is conveyed to a revolving furnace material surge bunker; when the amount of the screened-out sintering ore is larger than the number of the materials used for the revolving furnace, the redundant screened-out sintering ore is conveyed to a finished product system; According to the sintering machine screening granulating machine for the revolving furnace, a lower screen is of a two-stage screen side-by-side inclined arrangement structure, wherein the size of screen holes of the upper first-stage screen ranges from 7 mm to 5 mm, and the size of screen holes of the lower second-stage screen ranges from 9 mm to 11 mm. The revolving furnace sintering ore granulating technology has the advantages that the sintering ore with the granulometric class ranging from 6 mm to 10 mm is used as the blowing cooling agent for the revolving furnace, the oxidation time in the blowing process is shortened, and the cooling effect is more ideal; the effect of revolving furnace sintering ore granulating technology is better than the effect of large-granulate sintering ore and returning ore in the aspects of accelerating lime dissolution, reducing the furnace slag return drying degree and improving the molten steel yield; the ore returning effect is good, and repeated machining of the sintering ore is reduced.

Description

technical field [0001] The invention relates to a converter sinter sizing process in the iron and steel industry and a sintering machine screening and sizing machine for the converter. Background technique [0002] The original converter used lump ore as cooling agent for blowing. Due to the high moisture content of lump ore, air bubbles and component segregation were generated in the blowing process, and then the finished sinter was used instead. The sinter has a larger particle size. Generally, the finished sinter > 10mm The proportion accounts for about 80%, the oxidation time is long in the blowing process, and the cooling effect is not very ideal. Moreover, the converter uses a large amount of blowing coolant (oxidant), which greatly affects the supply and demand balance of iron burning, and there is a certain waste. If all converters are equipped with sintered ore return as blowing coolant, since the return ore particle size is too fine (generally 0-5mm), the blowi...

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Problems solved by technology

[0003] In order to solve the problem of unbalanced supply and demand of iron sintering, uneven composition and waste caused by the use of finished sinter as a coolant in converter blowing, and to further improve the effectiveness of sinter utilization and the cooling effect of converter blowing, the purpose of the present invention is to provide a By optimizing the sinter sinter sizing process and improving the sinter particle size composition, while providing the converter with sinter that meets its physical and chemical performance requirements, the converter sinter sizing that optimizes the effectiveness of sinter utilization and production benefits is realized. Process and converter sintering machine screening granulator

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