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Method for treating high-phosphorus oolitic hematite shaft furnace to prevent high-temperature reduction and bonding of pellets

A technology of oolitic hematite and shaft furnace, which is applied in the direction of shaft furnace, furnace, furnace type, etc., and can solve the problems of high-temperature reduction and bonding of pellets

Active Publication Date: 2015-10-28
韩其平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method and device for treating high-phosphorus oolitic hematite shaft furnace to prevent high-temperature reduction and adhesion of pellets, which solves the problem of high-temperature reduction and adhesion of pellets. Once the technical route of this process is opened, it is expected to become It is an effective means of large-scale treatment of oolitic high-phosphorus hematite resources with the most development potential, and provides a new iron source for the steel industry. Main source of steel scrap

Method used

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  • Method for treating high-phosphorus oolitic hematite shaft furnace to prevent high-temperature reduction and bonding of pellets
  • Method for treating high-phosphorus oolitic hematite shaft furnace to prevent high-temperature reduction and bonding of pellets

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Effect test

Embodiment 1

[0031] The raw materials are TFe45.27%, SiO 2 8.21%, Al 2 o 3 5.61%, P0.58% oolitic hematite. According to the proportion: the weight percentage is 80% oolitic hematite, 8% coal, 7% slaked lime and 5% binder, mix evenly, and press the ball. Through the reduction shaft furnace, the reduction temperature is 1130°C, the reduction time is 1.5h, and the reduction gas composition is (H 2 :50%; CO: 42%; N 2 :8%), sealed and cooled to room temperature. The reduced ore is crushed and ground and subjected to weak magnetic separation to obtain a product with a weight percentage of TFe92% and a phosphorus content of 0.10%.

Embodiment 2

[0033] The raw materials are TFe42.1%, SiO 2 12.4%, Al 2 o 3 6.5%, P0.82% oolitic hematite. According to the proportion: the weight percentage is 78% oolitic hematite, 10% coal, 5% slaked lime and 7% binder, mix evenly, and press the ball. Through the reduction shaft furnace, the reduction temperature is 1200°C, the reduction time is 1.2h, and the reduction gas composition is (H 2 :52%; CO: 40%; N 2 :8%), sealed and cooled to room temperature. The reduced ore is crushed and ground and subjected to weak magnetic separation to obtain a product with a weight percentage of TFe94% and a phosphorus content of 0.13%.

Embodiment 3

[0035] The raw materials are TFe40.7%, SiO 2 14.4%, Al2 o 3 7.5%, P0.98% oolitic hematite. According to the proportion: the weight percentage is 82% oolitic hematite, 7% coal, 6% slaked lime and 5% binder, mix evenly, and press the ball. Through the reduction shaft furnace, the reduction temperature is 1150°C, the reduction time is 1.0h, and the reduction gas composition is (H 2 :50%; CO: 40%; N 2 :10%), sealed and cooled to room temperature. The reduced ore is crushed and ground and subjected to weak magnetic separation, and the obtained product has a weight percentage of TFe90% and a phosphorus content of 0.16.

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Abstract

The invention discloses a method for preventing pellets from high temperature reduction bonding in a high phosphorus oolitic hematite treatment shaft furnace, belonging to the technical field of direct-reduction ironmaking. High phosphorus oolitic hematite powder, pulverized coal, a dephosphorization agent and a bonding agent are mixed together according to a proper ratio, the mixture is milled and pressed into balls so as to prepare cold bound pellets, and the bound pellets are dried or maintained and are further conveyed into a direct-reduction shaft furnace; in the direct-reduction shaft furnace, the pellets are subjected to hot coal gas roasting, gas-based prereduction, coal-based direct reduction and cooling process from top to bottom, temperature range of gas-based prereduction and coal-based direct reduction for the bound pellets is 850-1200 DEG C, and standing time in the shaft furnace is 1-5 hours; the reduction gas comprises H2 and CO in a ratio of 1.2-4; the reduced pellets are sealed and cooled, at the outlet of a cooling section, temperature of the bound pellets is controlled to be 100-200 DEG C, and the bound pellets are further smashed, magnetically separated and briquetted, wherein TFe in the obtained iron product is not less than 88%, and phosphorus content is less than 0.3%. The method has the advantages of decreasing energy consumption of reduction process of the shaft furnace.

Description

technical field [0001] The invention belongs to the technical field of direct reduction ironmaking, and relates to a method for treating high-phosphorus oolitic hematite shaft furnace to prevent high-temperature reduction and bonding of pellets, that is, a process for treating oolitic hematite by using a gas-based + coal-based shaft furnace. Background technique [0002] Aiming at the abundant and difficult-to-use oolitic high-phosphorus hematite resources in China, China has been trying to solve the key technical bottlenecks, open up the technological process, and realize large-scale production, so that domestic iron and steel enterprises will gradually get rid of their dependence on foreign high-priced iron ore resources. . However, judging from the existing research results, the development of application technology in this direction is relatively slow. In the past, although a lot of research work has been carried out on the optimization of oolitic high-phosphorus hemati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/214C22B1/243
Inventor 曾加庆齐渊洪杨兆顺王建昌吴伟严定鎏许海川张曦东
Owner 韩其平