Method for increasing yield of super-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, large heat loss of edge material, and low yield, so as to reduce sintering The effect of returning ore, reducing internal stress, and reducing chapping

Active Publication Date: 2017-06-23
ANGANG STEEL CO LTD
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  • Abstract
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  • Claims
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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 edg

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  • Method for increasing yield of super-thick material layer sintering
  • Method for increasing yield of super-thick material layer sintering

Examples

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Example Embodiment

[0037] Example 1

[0038] Fully mix 55 parts by weight of iron concentrate and 45 parts by weight of bituminous coal, and then add quicklime to it to form a mixture; adjust the amount of quicklime added so that the binary basicity of the mixture is the same as the basicity of the sintering mixture, CaO / SiO 2 is 2.0; the bituminous coal is a mixture of fat coal and gas fat coal at a ratio of 1:1, and the particle size is less than 180 mesh; the mixture is mixed with 3 parts by weight of water and fully stirred in a mixer. The mixed material after mixing is hot-pressed by a briquetting machine, wherein the molding pressure is 25MPa; the hot-pressing temperature is 400° C.; the hot-pressing time is 10min; The above-mentioned hot-pressed pellets are distributed into the sintered mixture material layer through a distribution device arranged between the sintered distributor and the igniter, wherein the amount of hot-pressed pellets distributed into the edge sintered mixture is 1.5...

Example Embodiment

[0042] Example 2

[0043] Fully mix 65 parts by weight of iron concentrate and 35 parts by weight of bituminous coal, and then add quicklime to it to form a mixture; adjust the addition amount of quicklime so that the binary basicity of the mixture is the same as the basicity of the sintering mixture, and CaO / SiO 2 is 2.2; the bituminous coal is fat coal, and the particle size is less than 180 mesh; the mixture is added with 5 parts by weight of water, and the mixture is fully stirred and mixed in a mixer. The mixed material is hot-pressed by a briquetting machine, wherein the molding pressure is 22MPa; the hot-pressing temperature is 450° C.; the hot-pressing time is 12min; Distribute the above-mentioned hot-pressed pellets into the sintered mixture material layer through a 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 intermediate sinte...

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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 iron-making production, relates to the production technology of iron-making raw materials, and particularly relates to a method for improving the sintered yield of an ultra-thick material layer and a distributing device for realizing the method. Background technique [0002] In the sintering production process, after the sintering mixture cloth is ignited on the trolley, the air is exhausted from the surface to the inside 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 layer 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 layer sintering technology also faces some difficulties. [0003] With the thickening of the sintered material layer, the airflow resistan...

Claims

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Application Information

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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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