Magnetite powder pellets and production method thereof

A technology of magnetite powder and a production method, applied in the field of metallurgy, can solve the problems of deteriorating the metallurgical properties of pellets, affecting the strength of finished pellets, etc., and achieve the effects of improving metallurgical properties and facilitating strength

Active Publication Date: 2019-03-19
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the present invention is: in the production of the existing superfine-grained magnetite powder pellets, oxidation phenomena of different degrees are prone to occur, seriously affecting the strength of the finished pellets and deteriorating the metallurgical properties of the pellets

Method used

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  • Magnetite powder pellets and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Batching: batching is carried out according to 10 parts by weight of hematite powder, 88 parts by weight of magnetite powder and 2 parts by weight of bentonite;

[0034] (2) Mixing and pelletizing: the above-mentioned mixture is mixed uniformly by a mixer, then added to a disc pelletizer to replenish water, pelletized to produce pellets, and a ball with a moisture content of 9.7% (by weight percentage) is obtained Agglomerates, the average particle size is 9mm-15mm;

[0035] (3) Roasting: Distributing and roasting on the grate machine-rotary kiln to obtain finished pellets; the temperature of the grate preheating stage I is 600-800°C; the temperature of the preheating stage II is 880-980°C; The kiln head firing temperature is 1040-1080°C. The preheating roasting process parameters are specifically shown in Table 1:

[0036] Table 1 Grate - Rotary Kiln Roasting Temperature

[0037] different parts

Embodiment 2

[0039] (1) Batching: batching is carried out according to 14 parts by weight of hematite powder, 84 parts by weight of magnetite powder and 2 parts by weight of bentonite;

[0040](2) Mixing and pelletizing: the above-mentioned mixture is mixed uniformly by a mixer, then added to a disc pelletizer to replenish water, pelletized to produce pellets, and a ball with a moisture content of 9.7% (by weight percentage) is obtained Agglomerates, the average particle size is 9mm-15mm;

[0041] (3) Roasting: Distributing and roasting on the grate machine-rotary kiln to obtain finished pellets; the temperature of the grate preheating stage I is 600-800°C; the temperature of the preheating stage II is 880-980°C; The kiln head firing temperature is 1040-1080°C.

Embodiment 3

[0043] (1) Batching: batching is carried out according to 18 parts by weight of hematite powder, 80 parts by weight of magnetite powder and 2 parts by weight of bentonite;

[0044] (2) Mixing and pelletizing: the above-mentioned mixture is mixed uniformly by a mixer, then added to a disc pelletizer to replenish water, pelletized to produce pellets, and a ball with a moisture content of 9.7% (by weight percentage) is obtained Agglomerates, the average particle size is 9mm-15mm;

[0045] (3) Roasting: Distributing and roasting on the grate machine-rotary kiln to obtain finished pellets; the temperature of the grate preheating stage I is 600-800°C; the temperature of the preheating stage II is 880-980°C; The kiln head firing temperature is 1040-1080°C.

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Abstract

The invention provides a production method of magnetite powder pellet ore. The production method comprises the steps of (1) burdening, wherein burdening is carried out according to 8-20 weight parts of hematite powder, 78-90 weight parts of magnetite powder and 1-2 weight parts of bentonite; (2) uniform mixing and pelletizing, wherein after being uniformly mixed by a blender mixer, raw materials in the step (1) are added into a disc pelletizer for water supplementation, and green pellets are prepared through pelletizing; and (3) roasting, wherein the green pellets prepared in the step (2) aredistributed and roasted on a chain grate machine-rotary kiln, and finished pellets are obtained. The invention further provides the magnetite powder pellet ore prepared through the above-mentioned method. According to the method, the strength of the magnetite powder pellet preheating and roasting pellet ore is improved, meanwhile, the metallurgical performance of the ore can be improved, and greatsignificance is achieved in efficiently utilizing the magnetite powder.

Description

technical field [0001] The invention belongs to the field of metallurgy. Specifically, the invention relates to a production method of magnetite powder pellets and magnetite powder pellets produced by the method. Background technique [0002] In recent years, with the development of my country's iron and steel industry, in order to improve the raw material conditions of blast furnaces, iron ore has been finely ground in the beneficiation process to improve the iron grade of iron ore powder. At the same time, in order to improve the quality of pellets, the grate-rotary kiln process is also used to produce pellets, so that the quality of pellets is more uniform. However, it was found in the production process that when the pellets were roasted with ultra-fine-grained magnetite powder, a large number of double-layer structures appeared in the pellets, which showed that the outer pellets formed a dense shell. According to preliminary analysis, the main reason is that the oxidat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/243C22B1/02
CPCC22B1/02C22B1/2406C22B1/243
Inventor 范建军史永林李昊堃蔡湄夏贺淑珍张华
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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