A production method of flux-based composite carbon-containing pellets for blast furnaces

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 problems such as roasting and bonding, self-reduction delay of carbon-containing pellets, etc., improve high-temperature metallurgical properties, and solve the The effect of reducing delay and improving compressive strength

Active Publication Date: 2017-01-18
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 distribution of carbon-containing raw materials in the inner and outer layers of the pellets through two pelletizations to solve the problem of flux-based pellet roasting bonding and internal self-reduction delay of carbon-containing pellets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Preparation of Mixture A: Mixture A is composed of iron concentrate 1, binder, flux and carbonaceous materials. The mass percentage of raw materials is: iron concentrate 1 is 74%, binder bentonite is 1.6%, and contains carbon. The mixture of semi-coke and petroleum coke is 14%, and the flux is a mixture of quicklime and magnesite powder. By adjusting the addition amount of flux, the ternary alkalinity (CaO+MgO) / SiO of the mixture A 2 Is 1.4.

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

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

[0032] raw material TFe% FeO% CaO%SiO 2 %

MgO%Al 2 O 3 % ...

Embodiment 2

[0036] 1. Preparation of Mixture A: Mixture A is composed of iron concentrate 3, binder, flux and carbonaceous materials. The mass percentage of raw materials is: iron concentrate 3 is 70%, binder is bentonite 1.4%, and contains carbon. The additive amount of the raw material semi-coke and biomass charcoal is 18%; the flux is a mixture of quicklime, magnesite powder and light burnt magnesia powder. SiO 2 Is 1.1.

[0037] 2. Preparation of pellet cores: Mix the mixture A with water and mix it evenly, where the added water accounts for 8.2% of the mass percentage of the mixture A. Then, a self-fluxing pellet core with a particle size of 5-7mm is made by a disc pelletizer. Among them, the chemical composition of bentonite, magnesite powder and quicklime are shown in Table 1, and the chemical composition of iron concentrate 3, iron concentrate 4, and light burnt magnesite powder is shown in Table 2.

[0038] Table 2 Example 2 Raw material ingredient mass percentage content

[0039] ...

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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, and particularly relates to a method for producing 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 steel process. In the current situation of increasingly stringent requirements for energy conservation and emission reduction in the world, there is an urgent need to develop innovative technologies that can greatly save energy and reduce pollutant emissions. In addition, in recent years, high-quality raw fuel resources have become increasingly scarce, and in the case of rising raw fuel prices, it is necessary to develop new charge 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 pellets are a kind of pellets with a certain con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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