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Method for preventing directly reduced metallic pellets from bonding

A pelletizing, direct technology, applied in the field of metallurgy, to achieve the effect of shortening the reduction time, solving the sticking problem, and promoting the reduction speed

Inactive Publication Date: 2012-01-18
辽宁博联特冶金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem of pellet sticking in the existing process of direct reduction of metal pellets, the present invention provides a method for preventing direct reduction of metal pellets from sticking. By covering the surface of mineral powder pellets with peritoneum, the metal balls after reduction are completed lumps won't stick

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The fineness of anthracite carbon powder used is 120-200 mesh, the fineness of lime powder is 160-200 mesh, the fineness of clay is 160-200 mesh, and the fineness of bentonite is 160-200 mesh;

[0035] Anthracite carbon powder, lime powder, clay and bentonite are mixed evenly to make peritoneal powder, and the composition in the peritoneal powder is 59% by weight of anthracite carbon powder, lime powder 26%, clay 10%, and bentonite 5%;

[0036] The materials to be reduced are pressed into slag pellets with a diameter of 8 mm by a briquetting machine, and the amount of water added when pressing the slag pellets is 4% of the total weight of the slag pellets;

[0037] Put the peritoneal powder into the pelletizing disc of the pelletizing machine, then place the mineral powder pellets to be reduced on the peritoneal powder of the pelletizing disc, start the pelletizing machine, when the average thickness of the peritoneal powder covered on the surface of the mineral powder p...

Embodiment 2

[0041] The fineness of anthracite carbon powder used is 120-200 mesh, the fineness of lime powder is 160-200 mesh, the fineness of clay is 160-200 mesh, and the fineness of bentonite is 160-200 mesh;

[0042] Anthracite carbon powder, lime powder, clay and bentonite are mixed evenly to make peritoneal powder, and the composition in the peritoneal powder is 61% by weight of anthracite carbon powder, lime powder 24%, clay 10%, and bentonite 5%;

[0043] The material to be reduced is pressed into a slag pellet with a diameter of 10mm by a briquetting machine, and the amount of water added when pressing the slag pellet is 5% of the total weight of the slag pellet;

[0044] Put the peritoneal powder into the pelletizing disc of the pelletizing machine, then place the mineral powder pellets to be reduced on the peritoneal powder of the pelletizing disc, start the pelletizing machine, when the average thickness of the peritoneal powder covered on the surface of the mineral powder pell...

Embodiment 3

[0048] The fineness of anthracite carbon powder used is 120-200 mesh, the fineness of lime powder is 160-200 mesh, the fineness of clay is 160-200 mesh, and the fineness of bentonite is 160-200 mesh;

[0049] Anthracite carbon powder, lime powder, clay and bentonite are mixed evenly to make peritoneal powder, and the composition in the peritoneal powder is 60% by weight of anthracite carbon powder, lime powder 25%, clay 9%, and bentonite 6%;

[0050] The materials to be reduced are pressed into 12mm mineral powder pellets with a diameter of 12mm, and the amount of water added when pressing the mineral powder pellets is 4% of the total weight of the mineral powder pellets;

[0051] Put the peritoneal powder into the pelletizing disc of the pelletizing machine, then place the mineral powder pellets to be reduced on the peritoneal powder of the pelletizing disc, start the pelletizing machine, when the average thickness of the peritoneal powder covered on the surface of the mineral...

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Abstract

Belonging to the technical field of metallurgy, the invention relates to a method for preventing directly reduced metallic pellets from bonding. The method comprises the steps of: (1) mixing anthracite carbon powder, lime powder, clay and bentonite uniformly so as to prepare peritoneal powder; (2) making a material to be reduced into mineral powder pellets; (3) placing the peritoneal powder into the pelletizing disc of a pelletizer, then putting the mineral powder pellets to be reduced on the peritoneal powder in the pelletizing disc, and initiating the pelletizer so as to prepare composite pellets; (4) subjecting the composite pellets and a pulverized coal reducing agent to a reduction reaction at a temperature of 1180-1220DEG C for 3-4h, thus obtaining metallic iron pellets. The method of the invention solves the bonding problem of directly reduced metallic pellets, and is especially suitable for producing high density metallic pellets, and also especially suitable for production of metallic pellets with high grade iron ore powder.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for preventing direct reduction metal pellets from bonding. Background technique [0002] The production of metal pellets by coal-based shaft furnace method, coal-based rotary kiln method and coal-based tunnel kiln method is an important method for metal reduction at present, but the coal-based shaft furnace method has shed material problems, and the coal-based rotary kiln method has iron The problem of powder falling off of powder pellets leads to the formation of rings in the rotary kiln, which affects normal production. During the production of coal-based tunnel kiln tank method, the pellets are easily bonded together to form large pieces, which makes it difficult to handle the materials after reduction. To solve this problem There is also a method of adding more reducing agent to the problem, but because the material mixing cannot be guaranteed to be uniform durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24
Inventor 陶立群唐竹胜
Owner 辽宁博联特冶金科技有限公司
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