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A method and device for detecting the reduction bonding strength of bulk iron oxides

A technology of iron oxide and bond strength, applied in the direction of measuring devices, mechanical devices, instruments, etc., can solve the problems of inability to intuitively and effectively characterize the bond strength of bulk iron oxide, complicated experimental process, and large sample volume , to avoid the influence of human factors, the operation process is simple, and the effect of small sample volume

Inactive Publication Date: 2018-07-27
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This method mainly has the following two disadvantages: ① the required sample volume is large, it is not easy to operate and the experimental process is relatively complicated
② The results obtained by this method are the particle size distribution obtained by different drum test times, which cannot directly and effectively characterize the bonding strength of bulk iron oxides

Method used

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  • A method and device for detecting the reduction bonding strength of bulk iron oxides
  • A method and device for detecting the reduction bonding strength of bulk iron oxides

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Adopting the method of the present invention to detect the reduced bond strength of bulk iron oxides specifically comprises the following steps:

[0044] 1) Take 200g of iron ore powder (Australian ore, Brazilian ore or domestic concentrate powder can be used) and grind it to below 200 mesh, then dry it in an oven at a temperature not lower than 100°C, put it into a mold at 20 Under the pressure of MPa, 6 cubes with a side length of 3cm were pressed; put the 6 prepared samples into the sintering experimental device for sintering experiment, the sintering temperature was 1300°C, the heating rate was 20°C / min, and the temperature was kept for 30min after rising to 1300°C Then down to room temperature.

[0045] 2) Put the sintered samples into a high-temperature air-based reduction environment in close contact with the upper and lower sides respectively, and apply 15N / cm above the samples 2 The pressure of the gas-based reduction experiment, the reduction gas composition ...

Embodiment 2

[0049] Adopting the method of the present invention to detect the reduced bond strength of bulk iron oxides specifically comprises the following steps:

[0050] 1) Take 200g of ferric oxide pure reagent (purity greater than 99%), 10g each of calcium oxide, aluminum oxide, magnesium oxide, and silicon dioxide, mix and grind it to below 200 mesh, and then dry it in an oven. The temperature is not lower than 100°C, put it into the mold and press it into 6 cubes with a side length of 3cm under the pressure of 20 MPa; put the prepared 6 samples into the sintering experiment device for sintering experiment, the sintering temperature is 1300°C, the heating rate 20°C / min, keep warm for 30 minutes after rising to 1300°C, and then drop to room temperature.

[0051] 2) Put the sintered sample into the air-based reduction environment and apply 15N / cm on the sample 2 The pressure of the high temperature gas-based reduction experiment is carried out, and the reduction gas composition is CO...

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Abstract

The invention discloses a method and a device for detecting reducing bonding strength of block-shaped iron oxide. According to the method, after the block-shaped iron oxide is ground, the ground block-shaped iron oxide is pressed to form a block-shaped sample for a sintering experiment, the sintered experiment sample is put in a reducing bonding strength detecting device for a torsion experiment, and the reducing bonding strength of the block-shaped iron oxide is represented through the maximum value of the torsion for separating the experiment sample. By means of the method, the problem that conventional experiment method and equipment cannot effectively, directly and accurately detect the reducing bonding strength is solved. The invention further provides a device capable of implementing the method. The device is simple in structure, convenient to operate and accurate in experiment result.

Description

technical field [0001] The invention belongs to the technical field of metallurgical engineering, and in particular relates to a method and a device for detecting the reduced bonding strength of massive iron oxides. Background technique [0002] Under the premise that hydrogen participates in the reduction of iron oxides, in the ironmaking process, the main characterization of the indirect reduction degree is the ratio of the amount of metallic iron produced by carbon monoxide reduction to the total reduced metallic iron. The process takes the gas-solid interphase reaction as the main form, and promoting the indirect reduction reaction of iron oxides will bring about an increase in the amount of metallic iron, and then the cohesion of particles in the solid state will occur. Although the reduction and bonding of lumpy charge in the upper and middle parts of the blast furnace has little effect on the overall forward flow of the furnace, the bonding will cause the segregation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N19/04
CPCG01N19/04
Inventor 徐健王冬东徐扬胡招文邓青宇温良英
Owner CHONGQING UNIV