A method for iron ore fluidized reduction ironmaking

A technology of fluidization and iron ore powder, which is applied in the direction of fluidized bed furnaces, furnaces, furnace types, etc., can solve problems such as difficult implementation, difficult control, and difficult control of carbon-attached process conditions, so as to achieve easy implementation and inhibit sticking Loss of flow, the effect of increasing the metallization rate of pre-reduction

Active Publication Date: 2019-11-05
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process conditions of carbon attachment are difficult to control. It is necessary to strictly control the appropriate temperature, gas composition and other parameters in order to make the chemical reaction 2CO=CO 2 +C, CH 4 =C+2H 2 However, it is also difficult to control the C deposited on the surface of the iron ore powder by the reaction, so this method is difficult to implement in industry.

Method used

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  • A method for iron ore fluidized reduction ironmaking
  • A method for iron ore fluidized reduction ironmaking
  • A method for iron ore fluidized reduction ironmaking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Put the magnetite powder and anthracite powder less than 1.0mm into the ball mill and grind for 20 minutes.

[0026] (2) Then the iron ore powder is separated by magnetic separation to obtain coal powder coated iron ore powder.

[0027] (3) Add coal powder coated iron ore powder into the fluidized bed, and at 850°C, feed CO=40%, H 2 =10%, N 2 =50% mixed gas, fluidized reduction for 60 minutes.

[0028] Results No cohesive flow loss occurred in the fluidized bed, no iron whisker was found in the sample after reduction, and the metallization rate was 85.7%.

[0029] Electron microscope scanning was carried out to the obtained sample, and the results can be found in image 3 , image 3 For the iron that the method reduction that the embodiment of the present invention provides provides, by image 3 It can be seen that there is no iron whisker in the sample.

Embodiment 2

[0035] (1) Put the magnetite powder and anthracite powder less than 1.0mm into the ball mill and grind for 15 minutes.

[0036] (2) Add the ground product (including iron ore powder and coal powder coated with coal powder) directly into the fluidized bed, and at 870°C, feed CO=40%, H 2 =10%, N 2 =50% mixed gas, fluidized reduction for 60 minutes.

[0037] Results No cohesive loss occurred in the fluidized bed, no iron whisker was found in the sample after reduction, and the metallization rate was 90.3%.

Embodiment 3

[0039] (1) Put the hematite powder and anthracite powder less than 1.0mm into the ball mill and grind for 10 minutes.

[0040] (2) Then the iron ore powder is separated by gravity separation to obtain coal powder coated iron ore powder.

[0041] (3) Put the coal powder coated iron ore powder into the fluidized bed, at 820°C, feed CO=45%, H 2 =15%, N 2 =40% mixed gas, fluidized reduction for 50 minutes.

[0042] Results No cohesive loss occurred in the fluidized bed, no iron whisker was found in the sample after reduction, and the metallization rate was 89.6%.

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Abstract

The invention provides a method for fluidization reduction ironmaking. The method comprises the following steps that iron ore powder and coal powder are mixed and ground to enable the coal powder to cover the surface of the iron ore powder; and fluidization reduction is conducted on the iron ore powder covered with the coal powder. According to the method, firstly the iron ore powder and the coal powder are mixed and ground to enable the coal powder to cover the surface of the iron ore powder, and then the fluidization reduction is conducted, so that the growth of iron crystal whisker can be effectively restrained, bonding flow loss of a fluidized bed is restrained, and the prereduction metallization rate is increased. Meanwhile, the method provided by the invention is simple in process, easy to implement in industry and has important significance on energy saving, consumption reducing and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of ironmaking, in particular to a method for fluidized reduction ironmaking. Background technique [0002] After more than 100 years of development, blast furnace ironmaking has the characteristics of the most mature technology, the largest production scale, and the lowest fuel ratio compared with other ironmaking processes. However, blast furnace ironmaking relies heavily on high-quality coking coal resources. With the rapid growth of the production scale and output of the iron and steel industry in recent years, the supply of coke has become increasingly tight and the price has soared, resulting in further increase in the cost of blast furnace ironmaking. The interdependent iron ore powder sintering and coking process not only consumes a lot of energy, but also emits a variety of pollutants that cause serious harm to the human body and the natural environment, such as alkali metal and heavy metal chlorine ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00
CPCC21B13/0033
Inventor 郝素菊蒋武锋张玉柱
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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