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Application of limonite as base material in pelletizing agglomerate production method

A technology of sintering ore and limonite, which is applied in the application field of limonite as a base material in the production of pelletized sintering ore, which can solve the problem of increased smelting costs, decreased yield of pelletized sintered ore, and reduced efficiency of sintering machines, etc. problems, to achieve the effect of improving quality, improving efficiency, increasing yield and utilization factor

Inactive Publication Date: 2003-07-16
新疆钢铁研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) During the conveying process, the pelletized sintered ore used as the base material will produce powder due to beating, thereby reducing the yield of the pelletized sintered ore;
[0005] (2) Since the 30-40mm high space above the grate of the sintering machine is always occupied by the bottom material of the pelletized sintering ore, this part of the space cannot be fully utilized, which reduces the efficiency of the sintering machine
Limonite contains high crystal water, and limonite lump ore can only be smelted in the furnace after roasting. However, it is generally necessary to use special roasting equipment to roast limonite, which will increase the cost of smelting. For details, see Metallurgical Industry Publishing The book "Iron Ore Agglomeration Theory and Technology" published in April 1992

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Various raw materials are batched according to the following proportions (% by weight, the sum of the following raw materials and the rolling fuel is 100%): iron concentrate 31.40%, rich ore powder 13.55%, dust removal ash 5.20%, iron oxide scale 4.40%, sulfuric acid slag 4.80%, return ore 20%, limestone 3.79%, dolomite 6.38%, quicklime 4.80%, coke powder 3.68%. The raw materials prepared according to the above proportions are transported to the cylinder mixer for mixing, and an appropriate amount of water is added during mixing to make the water content of the mixture 6.5%. Send the mixed material after mixing into a disc pelletizer to make pellets, and add an appropriate amount of supplementary water when making pellets, so that the water content of the mixed material is 8%. The small pellets made by the disk pelletizer and 2% (weight %) gas ash are transported into the cylinder mixer together, so that the gas ash is uniformly and firmly adhered to the surface of the ...

Embodiment 2

[0034] The various raw materials are compounded according to the following proportions (% by weight, the sum of the following raw materials and the rolling fuel is 100%): iron concentrate 54.53%, returned ore 28.57%, dolomite 7.89%, quicklime 5.0%, coke powder 1.46% %. The raw materials prepared according to the above proportions are transported to the cylinder mixer for mixing, and an appropriate amount of water is added during mixing to make the water content of the mixture 6.5%. Send the mixed material after mixing into a disc pelletizer to make pellets, and add an appropriate amount of supplementary water when making pellets, so that the water content of the mixed material is 8%. The small pellets made by the disc pelletizer and 2.55% (weight %) coke powder are transported into the drum mixer together, so that the coke powder can be evenly and firmly adhered to the surface of the small pellets.

[0035] The small pellets of coke powder rolled outside are added to the limo...

Embodiment 3

[0048] The various raw materials are compounded according to the following proportions (weight%, the sum of the following raw materials and the rolling fuel is 100%): 34.78% of iron concentrate, 34.62% of rich ore powder, 13.04% of returned ore, 9.48% of limestone, 1.04% of dolomite %, quicklime 2.61%, coke powder 2.22%. The raw materials prepared according to the above proportions are transported to the cylinder mixer for mixing, and an appropriate amount of water is added during mixing to make the water content of the mixture 6.5%. The mixed material after mixing is sent to a disc pelletizer to make pellets, and an appropriate amount of supplementary water is added during pelletizing to make the water content of the mixed material 7.8%. The small pellets made by the disc pelletizer and 2.21% (weight %) coke powder are transported into the cylinder mixer together, so that the coke powder can be evenly and firmly adhered to the surface of the small pellets.

[0049] The small...

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Abstract

An application of limonite as grate-layer material in producing spherical agglomerate features that its layer thickness is 30-40 mm and its granularity is 10-25 mm. The raw materials for producing spherical agglomerate include returned ore (10-20 wt.%), calcium lime (2-10), lime stone (0-12), dolomite (0-12), solid fuel (3-7.5) and Fe-contained material (rest).

Description

1. Technical field: [0001] The invention relates to a production method of pelletized sintered ore, belongs to the field of pelletizing sintered ore as an ironmaking raw material, and relates to the application of limonite as a bottoming material in the production of pelletized sintered ore. 2. Background technology: [0002] Conventional methods for producing pelletized sinter usually include the following process steps: batching, primary mixing, pelletizing, rolling out fuel, bottoming material distribution, small pellet distribution, ignition and sintering, crushing, cooling, and screening, such as: patent document CN1064107A , CN1160084A, CN1201835A, CN1249352A and CN1248636A etc. disclose some conventional methods for producing pelletized sinter. Among them, the use of bottom material can reduce the rate of damage to the grate; maintain a fixed effective exhaust area; prolong the life of the exhaust fan rotor and improve the operating rate of the sintering machine; impr...

Claims

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Application Information

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IPC IPC(8): C22B1/16
Inventor 臧疆文张群王红章张则刚刘新娣
Owner 新疆钢铁研究所
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