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Biochar-containing composite iron ore pellet for microwave reduction as well as preparation and application thereof

A technology of biochar and iron ore balls, which is applied in the field of iron and steel metallurgy, can solve the problems of poor reducibility and unsatisfactory green ball performance indicators, so as to improve performance, improve iron grade, metallization rate and reduction degree, and excellent green ball performance Effect

Active Publication Date: 2019-11-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the unsatisfactory raw pellet performance index and poor reducibility of the prior art, the present invention aims to provide a composite iron ore pellet containing biochar for microwave reduction (the present invention is also referred to as composite iron ore pellet for short). ), aiming to improve the green pellet index of the pellets, in addition to improve its reduction performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Magnetite powder 1 (accounting for total magnetite powder mass ratio 60%, specific surface area 1716cm 2 / g), magnetite powder 2 (accounting for total magnetite powder mass ratio 30%, specific surface area 903cm 2 / g), biochar, bentonite and water mix uniformly to form mixture A; in the control mixture A, the mass ratio of the carbon element of biochar and the iron element of magnetite powder is 0.26: 1, and the addition of bentonite is 2.3% of the quality of the magnetite powder, and the addition of water is 6% of the quality of the mixture A.

[0083] Magnetite powder 1 (accounting for total magnetite powder mass ratio 10%, specific surface area 1716cm 2 / g), bentonite and water mix uniformly to form mixture B; in mixture B, the add-on of bentonite is 2.3% of the magnetite powder quality, and the add-on of water is 6% of the quality of mixture B.

[0084] First, add mixture A to the disc pelletizer to make a spherical core, control the growth time of the mother core...

Embodiment 2

[0089] Magnetite powder 1 (accounting for total magnetite powder mass ratio 60%, specific surface area 1744cm 2 / g), magnetite powder 2 (accounting for total magnetite powder mass ratio 30%, specific surface area 988cm 2 / g), biochar, bentonite and water mix uniformly to form mixture A; in the control mixture A, the mass ratio of the carbon element of biochar and the iron element of magnetite powder is 0.28: 1, and the addition of bentonite is 2.1% of the quality of the magnetite powder, and the addition of water is 6% of the quality of the mixture A.

[0090] Magnetite powder 1 (accounting for total magnetite powder mass ratio 10%, specific surface area 1744cm 2 / g), bentonite and water mix uniformly to form mixture B; in mixture B, the add-on of bentonite is 2.1% of the magnetite powder quality, and the add-on of water is 6% of the quality of mixture B.

[0091] First, add mixture A to the disc pelletizer to make a spherical core, control the growth time of the mother core...

Embodiment 3

[0096] Magnetite powder 1 (accounting for total magnetite powder mass ratio 60%, specific surface area 1732cm 2 / g), magnetite powder 2 (accounting for total magnetite powder mass ratio 30%, specific surface area 970cm 2 / g), biochar, bentonite and water mix uniformly to form mixture A; in the control mixture A, the mass ratio of the carbon element of biochar and the iron element of magnetite powder is 0.31: 1, and the add-on of bentonite is 2.5% of the quality of the magnetite powder, and the addition of water is 6% of the quality of the mixture A.

[0097] Magnetite powder 1 (accounting for total magnetite powder mass ratio 10%, specific surface area 1732cm 2 / g), bentonite and water mix uniformly to form mixture B; in mixture B, the add-on of bentonite is 2.5% of the magnetite powder quality, and the add-on of water is 6% of the quality of mixture B.

[0098] First, add mixture A to the disc pelletizer to make a spherical core, control the growth time of the mother core t...

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Abstract

The invention relates to the technical field of metallurgy, and particularly discloses a biochar-containing composite iron ore pellet for microwave reduction. The composite iron ore pellet comprises apellet core and a pellet shell wrapping the pellet core; the pellet core comprises iron ore powder 1, iron ore powder 2 and biochar; the pellet shell comprises iron ore powder 1; the specific surfacearea of the iron ore powder 1 is greater than or equal to 1656.0 cm<2> / g; and the specific surface area of the iron ore powder 2 is greater than or equal to 853.0 cm<2> / g. Preparation and applicationmethods of the pellet are also disclosed. The composite iron ore pellet has a core-shell structure, the biochar is only distributed on the pellet core, the two kinds of iron ore powder meet the particle size grading requirement in the pellet core, the ubiquitous problem that the performance indexes of a biochar-containing composite iron ore pellet green pellet are relatively poor can be synergistically solved, the microwave reduction performance of the pellet can be improved, and the iron grade, the metallization rate and the reducibility of the reduced metallized pellet are improved.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a method for preparing composite iron ore pellets containing biochar for microwave reduction. Background technique [0002] China is the world's largest producer and consumer of crude steel. However, due to the extensive use of fossil fuels in the traditional blast furnace ironmaking process, the massive emissions of greenhouse gases, toxic gases, and metallurgical dust have caused serious pollution to the environment. According to statistics, China's crude steel output in 2017 was 831.7 million tons, an increase of about 5.7% over 2016. The blast furnace ironmaking process consumes 48.17% of energy in iron and steel enterprises, which poses a huge challenge to environmental protection and resource utilization. In 2016, China's blast furnace ironmaking emitted about 1 million tons of soot and 1.8 million tons of SO 2 and about 600,000 tons of nitrogen oxides...

Claims

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Application Information

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IPC IPC(8): C22B1/242
CPCC22B1/2406C22B1/242
Inventor 彭志伟李光辉姜涛叶雷王连成张元波饶明军林小龙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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