A kind of iron ore pellet containing biochar and preparation method thereof

A technology of biochar and iron ore balls, applied in the field of iron and steel metallurgy, can solve the problems of weak hydrophilicity, weak binding force, compression resistance, low drop strength, etc. The effect of optimizing composition and forming process

Active Publication Date: 2019-05-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, biochar is very different from traditional fossil fuels such as coal powder. Its hydrophilicity is weak and its binding force with iron ore powder is weak, resulting in the widespread occurrence of biochar-containing iron ore pellets. Problems such as compression resistance and low drop strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Mix magnetite powder, biochar, bentonite and water evenly to form mixed material A; control the mass ratio of the carbon element of biochar to the oxygen element of magnetite powder in mixed material A to be 1.05:1; the addition of bentonite The amount is 3wt% of the mass of the magnetite powder, and the addition of water is 6wt% of the mass of the mixed material A.

[0060] The magnetite powder, bentonite and water are mixed evenly to form a mixed material B; in the mixed material B, the amount of bentonite added is 3 wt% of the mass of the magnetite powder, and the added amount of water is 6 wt% of the quality of the mixed material B.

[0061] First add the mixture material A to the pelletizer to make the inner layer sphere, control the inner layer nucleation time to 3min, the inner layer growth time to 4min, control the diameter of the inner layer ball to 9mm, then add the mixture material B to control the outer layer The growing time is 2 minutes, and the compacting...

Embodiment 2

[0064] The magnetite powder, biochar, bentonite and water are milled for 5 minutes, and the milling speed is 600r / min to form a mixed material A; in the mixed material A, the mass ratio of the carbon element of the biochar to the oxygen element of the magnetite powder is controlled The ratio is 1.3:1; the added amount of bentonite is 2.5wt% of the mass of magnetite powder, and the added amount of water is 7wt% of the mass of mixed material A.

[0065] The magnetite powder, bentonite and water are milled for 5 minutes, and the milling speed is 600r / min to form a mixture B; in the mixture B, the addition of bentonite is 2.5wt% of the magnetite powder quality, and the addition of water is 7wt% of the mass of the mixed material B.

[0066] First add the mixture material A to the pelletizing machine to make the inner layer sphere, control the inner layer nucleation time to 2min, the inner layer growth time to 3min, control the diameter of the inner layer ball to 9mm, then add the m...

Embodiment 3

[0069] Mix magnetite powder, biochar, bentonite and water evenly to form mixed material A; control the mass ratio of the carbon element of biochar to the oxygen element of magnetite powder in mixed material A to be 0.95:1; the addition of bentonite The amount is 3.5wt% of the mass of the magnetite powder, and the amount of water added is 6wt% of the mass of the mixed material A.

[0070]Mix magnetite powder, bentonite and water evenly to form a mixture B; in the mixture B, the amount of bentonite added is 3.5wt% of the quality of the magnetite powder, and the amount of water added is 6wt% of the quality of the mixture B .

[0071] First add the mixture material A to the pelletizing machine to make the inner layer sphere, control the nucleation time of the inner layer to 3 minutes, the growth time of the inner layer to 4 minutes, control the diameter of the inner layer ball to 8mm, then add the mixture material B to control the outer layer The growing time is 2 minutes, and th...

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Abstract

The invention relates to biochar-containing iron ore pellets and a preparation method thereof. The preparation method comprises the following steps of: uniformly mixing iron ore powder, biochar, a binder and water to form a mixed material A; uniformly mixing iron ore powder, a binder and water to form a mixed material B; firstly putting the mixed material A in a pelletizer to prepare inner spheres, and then putting the mixed material B to form outer layers for coating the inner spheres, namely obtaining the biochar-containing iron ore pellets containing double-layer sphere structures; and controlling the diameter of the inner spheres to be D1 which is 8-10mm and the diameter of the pellets to be D2, wherein D2-D1 is 1-4mm and D2 is less than or equal to 12mm, the mass ratio of carbon of the biochar in in the inner spheres to oxygen of the iron ore powder is (0.95-1.3): 1, and the mass ratio of carbon of the biochar in the pellets to oxygen of the iron ore powder is (0.63-0.85): 1. Thetesting proves that the compression strength, drop strength and detonative temperature of the biochar-containing iron ore pellets prepared by the method can meet self-reduction pellets production verywell. The biochar-containing iron ore pellets are simple in technology, low in production cost and environmentally-friendly and have good industry foreground.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a biochar-containing iron ore pellet and a preparation method thereof. Background technique [0002] According to statistics, the energy consumption of the blast furnace ironmaking process accounts for 50% of the total energy consumption of iron and steel complexes, and the carbon dioxide produced accounts for about 70% of the total carbon dioxide emissions of the industry. In recent years, with the continuous improvement of environmental protection requirements, the development of traditional blast furnace ironmaking technology is facing many challenges. In order to seek sustainable development of iron and steel metallurgy, non-blast furnace ironmaking technology such as direct reduction ironmaking technology has become a research hotspot. Compared with gas-based direct reduction, coal-based direct reduction is suitable for the fuel distribution characteristi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/242
CPCC22B1/2406C22B1/242
Inventor 彭志伟李光辉姜涛古佛全林小龙张元波饶明军颜加兴李志忠唐慧敏范晓慧郭宇峰杨永斌李骞徐斌杨凌志易凌云
Owner CENT SOUTH UNIV
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