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A kind of oxidized pellet binder made from low-rank coal and its preparation method and application

A technology for oxidizing pellets and binders, which is applied in the fields of oxidizing pellet binders and their preparation methods and applications, and can solve the problems of iron grade decline, increased energy consumption in steel production, and increased gangue content in pellets, etc. Achieve the effect of improving iron grade, reducing production cost and improving green pellet strength

Active Publication Date: 2021-08-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the problems that the addition of bentonite in the existing iron ore pellet production process leads to the increase of pellet gangue content, the decrease of iron grade, the increase of energy consumption in steel production, and the fact that some low-quality iron ore resources cannot be pelletized with bentonite binder. The purpose of the invention is to provide a method for preparing an oxidized pellet binder made from low-rank coal, using low-rank coal as raw material, through simple oxidation fermentation, and then synchronously extracting humic acid and pulping to obtain oxidized pellets Agglomerated binder, cheap raw materials, wide sources, simple process, low binder consumption, good bonding performance, strong applicability, not only can significantly improve the ball-forming performance of refractory nodular iron ore resources, but also has a good effect on the iron content of finished balls. taste does not matter

Method used

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  • A kind of oxidized pellet binder made from low-rank coal and its preparation method and application
  • A kind of oxidized pellet binder made from low-rank coal and its preparation method and application

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Effect test

Embodiment 1

[0029] Using vanadium-titanium magnetite as raw material to make pellets, the raw material moisture is 5.0wt%, adding a binder accounting for 3.0wt% of its mass to the vanadium-titanium magnetite powder to keep the moisture at 8.0wt% during pelletizing, Mix thoroughly and evenly, then sieve the mixture to a size below 1mm, and use a disc pelletizer to make pellets. The pelletizing time is 10-12 minutes, and the pellet size is 10-12mm. The obtained iron ore green balls are tested, and the drop strength of the green balls is 3.5 times / (0.5m), and the compressive strength is 13.7N / piece.

Embodiment 2

[0036] The vanadium-titanium magnetite is pretreated by high-pressure roller mill for 3 times and then pelletized, adding 1.0wt% water and 2.0wt% binder slurry to the iron ore powder to make the water Keep it at 8.0wt%, mix thoroughly and evenly, and then sieve the material to be less than 1mm, and use a disc pelletizer to pelletize. The pelletizing time is 10-12min, and the pellet size is 10-12mm. The obtained iron ore green balls are tested, and the drop strength of the green balls is 8.6 times / (0.5m), and the compressive strength is 21.3N / piece.

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Abstract

The invention discloses an oxidized pellet binder made from low-rank coal and its preparation method and application. After the low-rank coal is broken, it is oxidized and fermented, then solid caustic and water are added to prepare the slurry, and it is obtained by heating and stirring. Oxidized pellet binder: The oxidized pellet binder is added to iron ore powder for pelletizing to obtain green iron ore pellets for oxidized pellets. The invention uses low-rank coal as raw material, through simple oxidative fermentation, and then synchronously extracts humic acid and pulping to obtain the oxidized pellet binder. The raw material is cheap and has a wide source, and the process is simple. With good performance and strong applicability, it can not only significantly improve the pelletizing performance of refractory nodular iron ore resources, but also has no impact on the iron grade of the finished pellets.

Description

technical field [0001] The invention relates to an oxidized pellet binder made from low-rank coal and its preparation method and application, belonging to the technical field of iron and steel metallurgy. Background technique [0002] Steel is an important basic material for national economic construction and social development. Since 2000, China's crude steel output has grown rapidly. In 2000, my country's crude steel output was 127 million tons, accounting for only 15% of the global crude steel output. In 2018, China's cumulative output of crude steel reached 928 million tons, accounting for more than half of the world's steel production. [0003] With the continuous growth of steel production, the structure of its production charge is also in continuous development. The main ferrous raw materials for steel production include sinter, pellets and lump ore. With the increasing shortage of high-quality iron ore resources, the lump ore resources that meet the requirements of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24
CPCC22B1/242
Inventor 李光辉罗骏姜涛饶明军彭志伟张鑫张元波李骞
Owner CENT SOUTH UNIV
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