Method for preventing pellets from high temperature reduction bonding in high phosphorus oolitic hematite treatment shaft furnace

A technology of oolitic hematite and shaft furnace, which is applied to shaft furnaces, furnaces, furnace types, etc., can solve the problems of high temperature reduction and bonding of pellets

Active Publication Date: 2014-03-26
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 preventing pellets from high temperature reduction bonding in high phosphorus oolitic hematite treatment shaft furnace

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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 Applications(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
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