Production method of fluxed composite carbon-containing pellets used in blast furnace

A production method and flux-based technology, which are applied in the production field of flux-based composite carbon-containing pellets for blast furnaces, can solve the problems of self-reduction delay, roasting and bonding of carbon-containing pellets, etc., and achieve self-reduction delay, high-temperature metallurgy The effect of improving performance and increasing compressive strength

Active Publication Date: 2015-10-14
ANGANG STEEL CO LTD
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Problems solved by technology

[0009] The invention provides a production method of flux-based composite carbon-containing pellets for blast furnaces, aiming to produce flux-based composite carbon-containing pellets with double alkalinity and gradient distributi

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Preparation of mixture A: Iron concentrate 1, binder, flux and carbonaceous materials are used to form mixture A. The mass percentage of raw materials is: iron concentrate 1 is 74%, binder bentonite is 1.6%, and carbonaceous The mixture of material semi-coke and petroleum coke is 14%, and the flux is a mixture of quicklime and magnesite powder. By adjusting the amount of flux added, the ternary alkalinity (CaO+MgO) / SiO 2 is 1.4.

[0030] 2. Preparation of pellet cores: mix the mixture A with water, and the amount of water added accounts for 7.8% of the mass percentage of the mixture A, and then use a disc pelletizer to make self-fluxing pellet cores with a particle size of 5-7mm . The chemical composition of iron concentrate 1, iron concentrate 2, bentonite, quicklime and magnesia powder is shown in Table 1.

[0031] Table 1 Example 1 Raw material composition mass percentage content

[0032] raw material

TFe%

FeO%

CaO%

SiO 2 %

MgO% ...

Embodiment 2

[0036] 1. Preparation of mixture A: Iron concentrate 3, binder, flux and carbonaceous materials are used to form mixture A. The mass percentage of raw materials is: iron concentrate 3 is 70%, binder bentonite is 1.4%, and carbonaceous The addition amount of the mixture of raw material semi-coke and biochar is 18%; the flux is a mixture of quicklime, magnesite powder and light-burned magnesium powder, and the addition amount of flux is adjusted so that the ternary alkalinity (CaO+MgO) / SiO 2 is 1.1.

[0037] 2. Preparation of pellet cores: add water to the mixture A and mix evenly, wherein the amount of water added accounts for 8.2% by mass of the mixture A. Then use a disc pelletizer to make self-fluxing pellet cores with a particle size of 5-7mm. Among them, the chemical compositions of bentonite, magnesite powder and quicklime are shown in Table 1, and the chemical compositions of iron concentrate 3, iron concentrate 4, and burnt magnesium powder are shown in Table 2.

[...

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Abstract

The invention provides a production method of fluxed composite carbon-containing pellets used in a blast furnace, wherein a mixture A is composed of 65-80% of iron ore concentrate, 1-2% of a binding agent and 10-20% of a carbon-containing material with addition of a flux to enable the ratio of (CaO+MgO)/SiO2 of the mixture A to be 1-1.4. The mixture A is added with water and is mixed uniformly to form self-fluxing pellet cores being 5-7 mm in granularity. A mixture B is composed of 75-85% of the iron ore concentrate, 1-2% of the binding agent and 5-15% of the carbon-containing material, wherein a flux is added until the ratio of (CaO+MgO)/SiO2 of the mixture A is 0.2-0.5. The production method includes the steps of placing the self-fluxing pellet cores in a pelletizer, adding the mixture B for performing pelletizing continuously to obtain raw carbon-containing pellets being 10-16 mm in granularity, and roasting the raw carbon-containing pellets to obtain the fluxed composite carbon-containing pellets. The method solves the problems of roast bonding of the fluxed pellets and internal self-reduction delay of the carbon-containing pellets, enables the alkalinity and reduced carbon in the pellets to be distributed in a gradient manner, can greatly improve high-temperature metallurgical performances of the carbon-containing pellets, can reach 2081 N/pellet in compressive strength and is 40% in metallization rate.

Description

technical field [0001] The invention belongs to the technical field of ironmaking raw material production, in particular to a production method of flux-based composite carbon-containing pellets for blast furnaces. Background technique [0002] Blast furnace ironmaking is a key process for energy saving and emission reduction in the iron and steel process. At present, under the situation that the global requirements for energy saving and emission reduction are becoming increasingly strict, it is urgent to develop innovative technologies that can greatly save energy and reduce pollutant emissions. In addition, in recent years, the resources of high-quality raw materials and fuels have become increasingly scarce, and in the case of rising prices of raw materials and fuels, it is necessary to develop new furnace materials to flexibly deal with this situation. Carbon-containing pellets are a new type of blast furnace charge developed for this need. [0003] Carbon-containing pe...

Claims

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Application Information

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IPC IPC(8): C22B1/243C22B1/245C22B1/16
Inventor 周明顺张辉翟立委刘杰徐礼兵袁慧
Owner ANGANG STEEL CO LTD
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