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Method for preparing shaft furnace carbon brick from abrasive dust

A technology of shaft furnace and grinding debris, which is applied in the direction of sustainable waste treatment, solid waste management, and climate sustainability. It can solve the problems of large specific surface area of ​​grinding debris, low metal recovery rate, small particle size and specific gravity, and achieve The effect of reducing the amount of slag, improving the strength and metallurgical properties, and reducing the amount of use

Active Publication Date: 2013-03-20
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large specific surface area, small particle size and specific gravity of the grinding dust, and a certain amount of oil, the metal yield is low when it is directly smelted in the converter or electric furnace, generally 63%-86%, and a large amount of smoke is generated at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] (1) Powder mixing:

[0012] Blast furnace gas ash, converter dedusting, coke powder, and 42.5% cement are mixed evenly according to the following proportions by mass: 504 parts of blast furnace gas ash; 678 parts of converter dedusting ash; 252 parts of coke powder; 315 parts of 42.5% cement.

[0013] (2) Add grinding debris:

[0014] Add 20 parts by mass of grinding dust to the above-mentioned mixed powder, and mix again.

[0015] (3) Add water and stir to become a slurry:

[0016] Add 385 parts by mass of water to the mixed material added with grinding debris, and mix again to form a slurry.

[0017] (4) Forming:

[0018] Add an appropriate amount of slurry into the mold, and apply a pressure of 0.8MPa to form a hexagonal column (side l = 65 mm, height h = 130 mm).

[0019] (5) Maintenance:

[0020] Cured for 3 days at 20°C±1°C and relative humidity greater than 95%.

[0021] The strength of carbon bricks is above 12MPa.

[0022] In this example, 1 part by mas...

Embodiment 2

[0024] (1) Powder mixing:

[0025] Stir the blast furnace gas ash, converter dust removal, coke powder, and 42.5% cement according to the following proportions by mass:

[0026] 504 parts of blast furnace gas ash; 678 parts of converter dust removal; 252 parts of coke powder; 84 parts of 42.5 cement.

[0027] (2) Add grinding debris:

[0028] Add 200 parts by mass of grinding dust to the above-mentioned mixed powder, and mix again.

[0029] (3) Add water and stir to make a slurry:

[0030] 365 parts by mass of water were added to the mixed material with grinding debris, and mixed again to form a slurry.

[0031] (4) Forming:

[0032] Add an appropriate amount of slurry into the mold, and pressurize at 0.8MPa to form a hexagonal column (side l = 65 mm, height h = 130 mm).

[0033] (5) Maintenance:

[0034] Cured for 3 days at 20°C±1°C and relative humidity greater than 95%.

[0035] The strength of carbon bricks is above 6MPa.

[0036] In this example, 1 part by mass i...

Embodiment 3

[0038] (1) Powder mixing:

[0039] Stir the blast furnace gas ash, AOD dedusting, coke powder, and 42.5 cement according to the following proportions by mass:

[0040] 504 parts of blast furnace gas ash; 678 parts of AOD dedusting ash; 252 parts of coke powder; 210 parts of 42.5 cement.

[0041] (2) Add grinding debris:

[0042] Add 160 parts by mass of grinding dust to the above-mentioned mixed powder, and mix again.

[0043] (3) Add water and stir to make a slurry:

[0044] 370 parts by mass of water were added to the mixed material added with grinding dust, and mixed again.

[0045] (4) Forming:

[0046] Add an appropriate amount of slurry into the mold, and pressurize at 0.8MPa to form a hexagonal column (side l = 65 mm, height h = 130 mm).

[0047] (5) Maintenance:

[0048] Cured for 3 days at 20°C±1°C and relative humidity greater than 95%.

[0049] The strength of carbon bricks is above 8MPa.

[0050] In this example, 1 part by mass is 1 kg.

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Abstract

The invention relates to a method for preparing a shaft furnace carbon brick from abrasive dust, belonging to the technical field of raw material formation machining. The shaft furnace carbon brick is prepared from the following raw materials in parts by mass: 1400-1600 parts of dust, 0-360 parts of reducer, 100-350 parts of adhesive and 20-200 parts of abrasive dust. The method comprises the following steps: evenly stirring the raw materials, adding 100-360 parts of water, evenly stirring, forming in a die, and curing for 1-7 days for smelting of shaft furnaces or other facilities. The invention can reduce the consumption of adhesive-cement, enhances the strength and metallurgical performance of the carbon brick, and efficiently utilizes the waste resources; and the invention reduces the consumption of metallurgical fuel and auxiliary materials, and also reduces the slag quantity.

Description

technical field [0001] The invention relates to a method for making shaft furnace carbon bricks by using grinding dust, and belongs to the technical field of raw material molding processing. Background technique [0002] A large amount of scrap iron and steel scrap (collectively referred to as grinding dust) are produced in the production process of iron and steel metallurgy, steel rolling, mechanical processing and manufacturing industries. Taking metallurgical enterprises as an example, the production of grinding debris accounts for about 1.8% of steel production. At present, all kinds of grinding debris are mainly directly sent to smelting equipment such as converters or electric furnaces as metallurgical raw materials. Due to the large specific surface area, small particle size and specific gravity of grinding debris, and a certain amount of oil, the metal yield is low when directly smelted in a converter or an electric furnace, generally 63%-86%, and a large amount of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B18/14
CPCY02W30/91
Inventor 叶文成史永林
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD