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Pre-pressing forming and intensified sintering method of fine iron ore concentrate

A technology of pre-pressing and strengthening sintering, which is applied in the field of iron and steel metallurgy, and can solve the problems of air permeability of sintering material layer, sinter strength, adverse effects on output and energy consumption, and high production cost that affect the granulation effect of sintering mixture, and achieve broad Promote the value and application prospects, broaden the source of iron-making raw materials, and increase production efficiency

Inactive Publication Date: 2013-09-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding a small amount of fine-grained magnetite concentrate (usually accounting for 10-20% of the total iron raw material) in the sinter mixture is one of the effective measures to improve the iron grade of sinter ore, but the further increase of fine-grained magnetite concentrate , will affect the granulation effect of the sinter mixture and the air permeability of the sinter layer, thus adversely affecting the strength, output and energy consumption of the sinter ore
At present, cylinder mixers are mainly used for mixing and granulation at home and abroad. In order to strengthen granulation and improve the granulation effect, most manufacturers use lengthened cylinder mixers and increase the number of mixer segments (from two-stage mixers to three-stage mixers). Machine) or improve the structure of the mixer, coke powder separation, quicklime separation and other technologies, high-pressure roller milling or lubricating grinding pretreatment technology to improve surface activity and the use of disc pelletizers to strengthen granulation and other technologies have achieved certain results. effect, but the production process needs to be transformed, which requires large investment and high production costs

Method used

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  • Pre-pressing forming and intensified sintering method of fine iron ore concentrate
  • Pre-pressing forming and intensified sintering method of fine iron ore concentrate
  • Pre-pressing forming and intensified sintering method of fine iron ore concentrate

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Experimental program
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Effect test

Embodiment 1

[0033] The proportion of magnetite fine powder in the total iron raw material is 30%, add 3% quicklime to the magnet fine powder and mix well, the water content of the mixture is 8.4%, and the rolling pressure is 8×10 4 N / mm is pressed into a 3-12mm agglomerate by a high-pressure roller forming machine, and then mixed with other sintering raw materials. The ratio of raw materials is controlled according to the chemical composition of sinter (iron grade 57-58%, basicity CaO / SiO2=2.0, MgO1.5%, SiO2 25.8%) are added after calculation. After the mixture is mixed and granulated by the secondary cylinder, the water content of the mixed pellets is 8.3%, and then sintered. The 3-12mm particle size content in the granulation mixture is 89.3%, and the air permeability resistance of the material layer is reduced to 70mmH 2 O, the yield of sintered ore is 70.14%, and the utilization factor is 1.42t / m 2 h, drum strength 62.45%, sintered solid fuel consumption 64.6kg / t.

Embodiment 2

[0037] The proportion of magnetite concentrate powder in the total iron raw material is 40%, and 5% quicklime is added to the magnetite concentrate powder to mix evenly. The moisture content of the mixture is 8.7%. 4 Under N / mm, it is pressed into a 3-12mm agglomerate by a high-pressure roll forming machine, and then mixed with other sintering raw materials. The ratio of other sinter raw materials is controlled according to the chemical composition of sinter ore (iron grade 57-58%, basicity CaO / SiO2=2.0, MgO1.5%, SiO2 2 5.8%) are added after calculation. The mixture is mixed and granulated by a secondary cylinder, the moisture content of the mixed pellets is 8.4%, and then the mixed pellets are sintered. The 3-12mm particle size content in the granulation mixture is 77.2%, and the air permeability resistance of the material layer is reduced to 100mmH 2 O, the yield of sintered ore is 70.74%, and the utilization factor is 1.30t / m 2 h, drum strength 62.78%, sintered solid fue...

Embodiment 3

[0041] The proportion of magnetite fine powder in the total iron raw material is 50%. After adding 10% quicklime to the magnet fine powder, mix evenly. The water content of the mixture is 9.2%. 4 Under N / mm, it is pressed into a 3-12mm agglomerate by a high-pressure roll forming machine, and then mixed with other sintering raw materials. The ratio of sintering raw materials is controlled according to the chemical composition of sintering ore (iron grade 57-58%, basicity CaO / SiO2=2.0, MgO1.5%, SiO2 2 5.8%) are added after calculation. The mixture is mixed and granulated by the secondary cylinder, the moisture of the mixed pellets is 8.7%, and then the mixed pellets are sintered. The 3-12mm particle size content in the granulation mixture is 65.3%, and the air permeability resistance of the material layer is reduced to 110mmH 2 O, the yield of sintered ore is 65.21%, and the utilization factor is 1.33t / m 2 h, drum strength 61.09%, sintered solid fuel consumption 65.62kg / t.

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Abstract

The invention relates to a pre-pressing forming and intensified sintering method of fine iron ore concentrate. The pre-pressing forming and intensified sintering method comprises the following steps of: firstly, mixing fine iron ore concentrate with calcined lime uniformly, and forming into cylindrical material particles through pre-pressing by a high pressure roller forming machine; then, mixing the cylindrical material particles with other sintering raw materials to form a mixture, and arranging, igniting and sintering sintering material particles after the sintering material particles are prepared inside a cylindrical nodulizer so as to obtain agglomerate. The key of the method is as follows: the iron ore concentrate is processed through pre-pressing forming, material difficult to pelletize is forced to be formed through strong external force effect, the size composition of the mixture is improved, and the mixture is palletized together with other mixtures so as to improve the air permeability of sintering material layer; the sintering performance and metallurgical performance of the fine iron ore concentrate are improved so as to intensify the sintering; and under the condition of keeping the quality of sintering ore, the sintering ore yield and iron grade are improved, the energy consumption is reduced, and charging material with good quality is provided for intensifying blast furnace process.

Description

technical field [0001] The invention discloses a method for pre-pressing and strengthening sintering of fine-grained iron ore concentrate; through pre-pressing and strengthening granulation of fine-grained iron ore concentrate powder, the particle size composition and gas permeability of the mixture can be effectively improved, thereby strengthening sintering. It belongs to the technical field of iron and steel metallurgy. Background technique [0002] Iron ore sinter is the main charge of blast furnace ironmaking in my country, accounting for about 70%-80% of the iron charge into the furnace. The national annual output of sinter is 500-600 million tons. It is of great significance to strengthen iron ore sintering, save fuel and reduce production costs. [0003] How to improve the iron grade of sinter ore, ensure the output and quality of sinter ore, and reduce the energy consumption of sinter ore are common issues faced by many manufacturers. Adding a small amount of fin...

Claims

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Application Information

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IPC IPC(8): C22B1/16
Inventor 朱德庆潘建李启厚春铁军师本静李晓波郭正启张峰
Owner CENT SOUTH UNIV
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