Producing method of fluxed composite pellet

A technology of composite pellets and production methods, which is applied in the field of ironmaking raw materials, can solve the problems of product metallurgical performance degradation, difficult process implementation, and lack of excellent metallurgical performance of high-basic sintered ore, and achieve high-temperature metallurgical performance improvement and simplification. The effect of the operation

Active Publication Date: 2014-10-01
ANGANG STEEL CO LTD
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Problems solved by technology

However, this method requires two spheres, and the size of the high-alkalinity cue ball core in the center of the raw ball and the thickness of the acidic spherical shell are not easy to control, and the process is complicated and difficult to achieve.
[0006] Chinese patent 200610001254.0 discloses a production method of flux-based iron ore powder composite pellets, which adopts multiple pelletizing methods to produce single-ball double-alkalinity composite flux-based pellets: that is, in the first pelletizing process, making Green balls contain appropriate amount of CaO and MgO, among which CaO / SiO 2 The weight ratio of the MgO content is between 0.5 and 2.0, and the weight ratio of the MgO content is between 2% and 4%. Then, the second pelletizing is performed, and the outer layer of the green ball surface is evenly coated with limestone powder, dolomite powder, and hematite. Dry powder or acid iron ore powder and other anti-adhesion layers, and then use the roasting temperature and roasting method of acid pellets for roasting. This method can solve the problem of cohesiveness of flux-based pellets during roasting, but it is still used twice. The pelletizing and secondary pelletizing process is complex and difficult to realize, and the metallurgical properties of its products have declined
First, the pellets are returned to the ore to be wetted with water, the water content is 6%~10%, so that the coarse particles in the returned ore have the nucleation function, and then mixed with iron concentrate powder, bentonite, etc. to make pellets; in order to ensure The raw pellets can grow continuously during the pelletizing process, and the way of adding water in the pelletizing process is atomized water. The present invention uses pellets to return ore instead of part of the iron concentrate, which can realize the closed cycle of pelletizing-returning-re-pelletizing, but The production is still ordinary acidic pellets, which do not have the excellent metallurgical properties of high-basic sinters

Method used

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  • Producing method of fluxed composite pellet
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  • Producing method of fluxed composite pellet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mix the iron material, flux and binder into a mixture, wherein the iron material is high-iron low-silicon iron concentrate, the flux is quicklime powder; the binder is bentonite, and its mass fraction in the mixture is 0.8%; adjust the quicklime powder Content, so that the alkalinity of the mixture is 0.6, wet the mixture with water and mix evenly. The iron concentrate, bentonite and quicklime were all taken from the production raw material warehouse of the Iron Works, and their chemical compositions are shown in Table 1.

[0019] Table 1 Test raw material composition (%)

[0020]

[0021] The high-alkalinity sintered ore with a particle size of 3mm~6mm and an alkalinity of 2.01 is used as the pellet core, and the above-mentioned mixture is used to pelletize once on a disc pelletizer to produce green pellets. The chemical composition of the high alkalinity sintered ore returned is shown in Table 2 (1# returned ore).

[0022] Table 2 Chemical composition of sintered...

Embodiment 2

[0026] Mix the iron material, flux and binder into a mixture, wherein the iron material is high-iron and low-silicon iron concentrate, the flux is quicklime powder; the binder is water glass, and its mass fraction in the mixture is 1%; adjust the quicklime Powder content, so that the alkalinity of the mixture is 0.8, wet the mixture with water and mix evenly. Both iron concentrate and quicklime powder are taken from the production raw material warehouse of the Iron Works, and their chemical compositions are shown in Table 3.

[0027] Table 3 Test raw material composition (%)

[0028]

[0029] The high-alkalinity sintered ore with a particle size of 3mm~6mm and an alkalinity of 2.32 is used as the pellet core, and the above-mentioned mixture is used to pelletize once on a disc pelletizer to produce green pellets. The chemical composition of the high alkalinity sintered ore returned is shown in Table 2 (2# returned ore).

[0030] Put the raw balls into the roasting furnace ...

Embodiment 3

[0032] Mix iron material, flux and binder to form a mixture, wherein the iron material is high-iron and low-silicon iron concentrate, the flux is quicklime powder; the binder is sodium humate, and its mass fraction in the mixture is 1.2%; Adjust the content of quicklime powder so that the alkalinity of the mixture is 1, wet the mixture and mix evenly. The iron concentrate and quicklime powder were taken from the production raw material warehouse of the Iron Works, and their chemical compositions are shown in Table 4.

[0033] Table 4 Test raw material composition (%)

[0034]

[0035] The high-alkalinity sintered ore with a particle size of 3mm~6mm and an alkalinity of 2.45 is used as the pellet core, and the above-mentioned mixture is used to pelletize once on a disc pelletizer to produce green pellets. The chemical composition of the high alkalinity sintered ore returned is shown in Table 2 (3# returned ore).

[0036] Put the raw balls into a roasting furnace or a rotar...

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Abstract

A producing method of a fluxed composite pellet is disclosed. The method includes: (1) mixing a iron material, a flux, and an adhesive to obtain a material mixture with the iron material being high-iron low-silicon iron ore powder, the flux being quicklime powder and the adhesive being bentonite, water glass or sodium humate, etc., adjusting the content of the quicklime powder to make the alkalinity of the material mixture to be 0.6-1.0, adding water into the material mixture to wet the material mixture and uniformly mixing; and (2) wetting high-alkalinity sintering return mine, subjecting the material mixture in the step (1) to primary pelletizing in a disk pelletizer to produce raw pellets by adopting the return mine as a pelletizing core, and calcinating according to fluxed composite pellet calcinating rules to obtain the fluxed composite pellet finished product with double alkalinity for one pellet. The composite pellet having advantages of high-alkalinity sintering ore and advantages of pellets is produced. The metallurgical performance of pellets is enhanced. A novel utilization route of the sintering return mine is provided.

Description

technical field [0001] The invention belongs to the technical field of ironmaking raw material production, and relates to the production technology of molten pellets, in particular to a production method of flux compound pellets. Background technique [0002] Blast furnace charge structure is an important prerequisite and material basis for ironmaking production to achieve high quality, low consumption, and high yield. my country's blast furnace charge is mainly high-basicity sinter, with some pellets and lump ore added. The number of pellets used in large and medium-sized blast furnaces in my country is increasing year by year, and the proportion is generally 20% to 30%. [0003] In addition to special pellets, as raw materials for blast furnace ironmaking, there are three types of industrialized pellets in the world: acidic oxidizing pellets, flux pellets and self-fluxing pellets, but currently acidic pellets are generally used in blast furnace production. Oxidizing pell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/14
Inventor 张辉周明顺翟立委刘杰刘帅
Owner ANGANG STEEL CO LTD
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