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A method for improving the yield of ultra-thick material layer sintering

A technology of yield rate and material layer, which is applied in the field of improving the sintering yield of ultra-thick material layer, and the field of material distribution device, can solve the problems of high return rate of sintered ore at the edge, low yield rate, large heat loss of edge material, etc., to reduce sintering The effect of returning ore, reducing internal stress, and improving air permeability

Active Publication Date: 2018-05-29
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two devices have a certain effect on alleviating the edge effect caused by the high wind speed through the edge, but the heat loss of the edge material is large, and the edge sinter return rate and low yield of the edge sinter caused by insufficient mineralization heat are not considered.

Method used

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  • A method for improving the yield of ultra-thick material layer sintering
  • A method for improving the yield of ultra-thick material layer sintering

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Fully mix 55 parts by weight of iron concentrate and 45 parts by weight of bituminous coal, then add quicklime to it to form a mixture; adjust the amount of quicklime added so that the binary alkalinity of the mixture is the same as that of the sintered mixture, CaO / SiO 2 2.0; the bituminous coal is mixed with fat coal and gas fat coal at a ratio of 1:1, and the particle size is less than 180 mesh; add 3 parts by weight of water to the mixture and fully stir and mix in the mixer. The mixed material is subjected to hot-press molding by a briquetting machine, wherein the molding pressure is 25MPa; the hot-press temperature is 400°C; the hot-press time is 10min; and the diameter of the obtained hot-press pellets is 8mm-12mm. Distribute the above-mentioned hot-pressed pellets into the sintered mixture layer through the distribution device arranged between the sintered distributor and the igniter, wherein the amount of hot-pressed pellets distributed into the edge sintered ...

Embodiment 2

[0043] Fully mix 65 parts by weight of iron concentrate and 35 parts by weight of bituminous coal, then add quicklime to it to form a mixture; adjust the amount of quicklime added so that the binary alkalinity of the mixture is the same as that of the sintered mixture, CaO / SiO 2 It is 2.2; wherein the bituminous coal is fat coal, and the particle size is less than 180 mesh; the mixture is fully stirred and mixed with 5 parts by weight of water in a mixer. The mixed material is hot-pressed by a briquetting machine, wherein the molding pressure is 22 MPa; the hot-pressing temperature is 450° C.; the hot-pressing time is 12 minutes; and the diameter of the obtained hot-pressed pellets is 8 mm to 12 mm. Distribute the above-mentioned hot-pressed pellets into the sintered mixture layer through the distribution device arranged between the sintered distributor and the igniter, wherein the amount of hot-pressed pellets distributed into the edge sintered mixture is twice that of the m...

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Abstract

The invention relates to a method for increasing the yield of super-thick material layer sintering. Hot pressing pellets with the alkalinity being the same as that of a sintering mixture are distributed into the sintering mixture, so that ventilation holes are formed in an upper sintering material layer during ignition sintering. The method comprises the steps that 55-70 wt% of iron concentrate and 30-45 wt% of soft coal are fully uniformly mixed, then quick lime is added into the iron concentrate and the soft coal to form a mixture, the binary alkalinity of the mixture is made to be the same as the alkalinity of the sintering mixture, the ratio of CaO to SiO2 is 1.8-2.4, 2-5 wt% of water is added into the mixture, and the mixture is fully stirred and uniformly mixed in a mixer; a uniformly mixed mixture is subjected to hot pressing forming through a ball press machine, wherein the forming pressure is 20-30 MPa, the hot pressing temperature is 350-550 DEG C, the hot pressing time is 8-15 min, and the diameters of obtained hot pressing pellets are 8-12 mm; and the hot pressing pellets are distributed into the sintering mixture layer through a distribution device arranged between a sintering distributor and an ignitor, wherein the amount of the hot pressing pellets distributed into the edge sintering mixture is 1-2.5 times that of the hot pressing pellets distributed into the middle sintering mixture, and the depth of the hot pressing pellets distributed into the sintering material layer is 20-200 mm.

Description

technical field [0001] The invention belongs to the technical field of ironmaking production, relates to the production technology of ironmaking raw materials, and in particular relates to a method for increasing the sintering yield of an ultra-thick material layer and a material distribution device for realizing the method. Background technique [0002] During the sintering production process, after the sintering mixture cloth is put on the trolley and ignited, it is exhausted by the exhaust fan from the surface to the inside from top to bottom, and it is completed from the surface to the surface of the grate bar of the sintering machine trolley. Thick bed sintering is an important and widely used sintering technology, which has the advantages of improving sinter strength and reducing sintering fuel consumption, but the application of thick bed sintering technology also faces some difficulties. [0003] With the thickening of the sintering material layer, the airflow resist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16C22B1/24
CPCC22B1/16C22B1/24
Inventor 张辉周明顺宫作岩翟立委刘杰徐礼兵吴远飞
Owner ANGANG STEEL CO LTD
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