Method for preventing self-fluxed pellets from bonding in roasting

A technology of self-melting and pelletizing, which is applied in the field of ironmaking raw material production, can solve the problem of high alkalinity pellet cohesiveness and other problems, so as to achieve not easy bonding, increase the proportion of furnace, and optimize the furnace charge structure effect

Active Publication Date: 2013-02-06
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method does not solve the problem of cohesiveness of high-basicity pellets well, and ignores the change of the roasting system after the basicity of the pellets changes.

Method used

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  • Method for preventing self-fluxed pellets from bonding in roasting
  • Method for preventing self-fluxed pellets from bonding in roasting
  • Method for preventing self-fluxed pellets from bonding in roasting

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Experimental program
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Embodiment Construction

[0021] Describe below in conjunction with specific embodiment:

[0022] The mixed ore was used to carry out the self-melting pelletizing test, and the composition of the mixed ore is shown in Table 1.

[0023] Table 1 Mass percentage of mixed ore components

[0024]

[0025] Fix the iron material, add flux and binder to make a mixture, the flux in the mixture is magnesite and lime powder, and the mass fraction of magnesite is 2%; the binder is bentonite; adjust the lime powder content so that The alkalinity of the mixture is 0.8, mix the mixture evenly, and pile it up for 30~40 hours. Then use a pelletizing machine to make the mixture into a self-fluxing pellet core with a particle size of 8-10mm.

[0026] Mix dolomite powder and iron boron fine powder evenly to make anti-adhesion peritoneum A, wherein the alkalinity of anti-adhesion peritoneum A is adjusted to 1.7 according to the alkalinity of the self-fluxing pellet core; lime powder, iron phosphorus and carboxymethyl ...

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Abstract

The invention discloses a method for preventing self-fluxed pellets from bonding in roasting. The method comprises technical steps as follows: mixing an iron material, a fusing agent and a bonder to obtain mixture; uniformly mixing dolomite powder and ferroboron flavor powder to obtain a bonding resisting film A; uniformly mixing line powder, ferrum and phosphorus and sodium carboxymethylcellulose to obtain a bonding resisting film B; positioning self-fluxed pellet cores into a balling tray; wrapping watered pellet cores by the bonding resisting film A, then wrapping by the bonding resisting film B; transferring raw balls into a roasting furnace or a rotary kiln; preheating for 20 minutes at 700 to 800 DEG C; preheating for 10 minutes at 900 to 1000 DEG C; and then roasting for 30 minutes at 1150 to 1200 DEG C, so as to obtain finished-product pellets. The method has the advantages and effects that the self-fluxed pellets are hardly bonded during a roasting process; alkalinity is distributed as gradient, so that a metallurgical performance of the self-fluxed pellets can be favorably improved, a feeding ratio of the self-fluxed pellets can be increased, and therefore, a charging material structure of a blast furnace can be further optimized.

Description

technical field [0001] The invention belongs to the technical field of ironmaking raw material production, and relates to the production technology of self-fluxing pellets, in particular to a method for preventing self-fluxing pellets from roasting and sticking. 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 sintered ore, and some pellets and lump ore are added. Therefore, the pellet plant mainly produces acid pellets, which have poor metallurgical properties such as reduction expansion, soft dripping and high-temperature reduction. It can no longer meet the requirements of fast operation of modern blast furnaces. The production of self-fluxing pellets with good metallurgical properties has become the priority direction for pellet manufacturers to improve pellet quality. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B1/02
Inventor 张辉周明顺翟立委刘杰
Owner ANGANG STEEL CO LTD
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