A kind of granulation method of high-chromium type vanadium-titanium magnetite sintering mixture

A technology for vanadium titanomagnetite and sintering mixture is applied in the field of vanadium titanomagnetite to achieve the effects of improving air permeability, sintering speed, strength, yield and capacity

Active Publication Date: 2019-05-28
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is no report on the technical scheme for effectively improving the granulation performance of the high-chromium vanadium-titanium magnetite mixture with coarse particle size.

Method used

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  • A kind of granulation method of high-chromium type vanadium-titanium magnetite sintering mixture
  • A kind of granulation method of high-chromium type vanadium-titanium magnetite sintering mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] After mixing 14.6 kilograms of high-chromium vanadium-titanium magnetite, 0.46 kilograms of quicklime and 0.62 kilograms of water, roll them into small balls on a disc pelletizer to obtain pellets with a particle size of 1 to 3 mm; The mass content of quicklime is 3%, and the mass content of water is 4%; the high-chromium vanadium-titanium magnetite used is 45% of the mass of the total high-chromium vanadium-titanium magnetite.

[0084] After mixing 17.9 kg of high chromium vanadium-titanium magnetite, 24 kg of returned ore, 4.34 kg of quicklime, 2.85 kg of coke powder, 4.98 kg of water and 15.6 kg of pellets, the cylinder pelletizer was used at 7.5 min and 24r / min under the conditions of pelletizing to obtain mixture particles; the returned ore is pre-wetted with water, wherein the mass content of water is 8%.

[0085] According to the method of Comparative Example 1, the particle size of the mixture particles prepared in Example 1 of the present invention is detected,...

Embodiment 2

[0087] The mixture particles are prepared according to the method described in Example 1; the difference from Example 1 is that the mass content of unslaked lime in the prepared pellets is 4%, and the mass content of moisture is 4.5%. The high-chromium vanadium-titanium magnetite accounts for 55% of the mass of the total high-chromium vanadium-titanium magnetite; the returned ore used is wetted with water in advance, and the mass content of water is 9%.

[0088] According to the method of Comparative Example 1, the particle size of the mixture particles prepared in Example 2 of the present invention is detected, and the test results are as shown in Table 1. As can be seen from Table 1, compared with Comparative Example 1, the obtained mixture particles prepared in Example 2 of the present invention The particle size content of mixture particles > 3mm increased by 3.6%, the powder < 0.5mm decreased by 1.4%, and the average particle size increased by 0.67mm.

Embodiment 3

[0090] Prepare the mixture particles according to the method described in Example 1; the difference from Example 1 is that the mass content of quicklime in the prepared pellets is 5%, and the mass content of moisture is 5%. The high-chromium vanadium-titanium magnetite accounts for 65% of the mass of the total high-chromium vanadium-titanium magnetite; the returned ore used is pre-wetted with water, and the mass content of water is 10%.

[0091] The particle size of the mixture particles prepared in Example 3 of the present invention is detected, and the detection results are shown in Table 1. It can be seen from Table 1 that compared with Comparative Example 1, the mixture particles prepared in Example 3 of the present invention>3mm The particle size content increased by 4.75%, the powder <0.5mm decreased by 2.2%, and the average particle size increased by 0.83mm.

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Abstract

The invention provides a high-chromium type vanadium-titanium magnetite sintering mixture pelleting method. The method comprises the following steps that (1), part of high-chromium type vanadium-titanium magnetite, quicklime and water and mixed and then pelleted, and then pellets are obtained; (2), residual high-chromium type vanadium-titanium magnetite, return fines, solvents, fuel, water and the pellets are mixed and then pelleted, and then mixture particles are obtained, wherein the particle size of the high-chromium type vanadium-titanium magnetite ranges from 0.25 mm to 0.074 mm, and the mass content of moisture in the return fines ranges from 8% to 10%. Compared with the prior art, according to the high-chromium type vanadium-titanium magnetite sintering mixture pelleting method, the adverse influence, caused by directly adding all high-chromium type vanadium-titanium magnetite to a mixture, to the pelleting property is avoided, the capacity of the return fines for adhering to fine aggregates is improved, the pelletizing property of the mixture is improved, breathability of a material layer in the subsequent sintering process can be improved, and therefore the purpose of improving the quality of sintered mineral products is achieved.

Description

technical field [0001] The invention relates to the technical field of vanadium-titanium-magnetite, in particular to a method for preparing a high-chromium vanadium-titanium-magnetite sintering mixture. Background technique [0002] my country's Panxi region has a relatively high chromium content (chromium grade Cr 2 o 3 0.55%~0.82%), with a total reserve of more than one billion tons of Hongge high-chromium vanadium-titanium magnetite, which has the characteristics of coarse particle size, unreasonable particle size composition, and poor hydrophilicity. Due to the coarse particle size and poor hydrophilicity of the vanadium-titanium magnetite, it is difficult to granulate the sintered mixture, which results in poor gas permeability of the material layer and low quality of sintered ore. Therefore, the research and development of high-chromium vanadium-titanium magnetite sintering mixture granulation technology plays a decisive role in the development and utilization of thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C22B1/16C22C38/60C22C32/00
CPCC22B1/16C22B1/2406C22C32/001C22C38/60
Inventor 甘勤付卫国何木光胡鹏蒋大军唐文博王禹建
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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