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Gas-based shaft-furnace direct-reduction smelting method for high-chromium-content vanadium-titanium magnetite

A technology of vanadium-titanium magnetite and vanadium-titanium magnet, which is applied in shaft furnaces, furnaces, furnace types, etc., can solve the problems of low comprehensive utilization rate, long blast furnace smelting process, and low grade, and achieve easy operation and control, clean Efficient separation and short process flow

Active Publication Date: 2014-03-26
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Firstly, the smelting of full high-chromium vanadium-titanium magnetite has not been realized by using this process; secondly, during the smelting process of high-chromium vanadium-titanium sinter and pellets, due to the pollution of solid reducing agent, the reduction products are not clean. The grade is low, and efficient and clean utilization cannot be realized; in addition, the blast furnace smelting process is long, it is inconvenient to flexibly control the reduction temperature and reduction atmosphere, it is difficult to control the migration direction of valuable components, and the comprehensive utilization rate is low, which is not conducive to the effective utilization of high-chromium vanadium Valuable components such as vanadium, titanium and chromium in titanium ore
[0005] Taking into account the basic characteristics of high-chromium vanadium-titanium magnetite, how to solve the problem of low comprehensive utilization rate of high-chromium vanadium-titanium magnetite blast furnace smelting process has become an important issue

Method used

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  • Gas-based shaft-furnace direct-reduction smelting method for high-chromium-content vanadium-titanium magnetite
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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The chemical composition of a high-chromium vanadium-titanium magnetite and experimental bentonite are listed in Table 1 and Table 2, respectively, by weight percentage.

[0017] Table 1 Chemical composition of high chromium type vanadium-titanium magnetite (by weight percentage)

[0018]

[0019] Table 2 Experimental bentonite chemical composition (by weight percentage)

[0020]

[0021] The implementation steps are as follows:

[0022] (1) Use a ball mill to wet-grind the high-chromium vanadium-titanium magnetite. The fine grinding time is 15 minutes, and the volume fraction of the ore powder particle size is not more than 0.074mm is 100%, and the finely ground vanadium-titanium magnetite concentrate powder is obtained.

[0023] (2) After mixing 100% finely ground vanadium-titanium magnetite concentrate powder, binder bentonite and water in an appropriate proportion, after stewing, a high-chromium vanadium-titanium magnetite with a diameter of 10.0-11.0mmd is ...

Embodiment 2

[0028] Still take the high-chromium type vanadium-titanium magnetite and bentonite in the implementation case 1 as raw materials.

[0029] The implementation steps are as follows:

[0030] (1) Use a ball mill to wet-grind the high-chromium vanadium-titanium magnetite. The fine grinding time is 15 minutes, and the volume fraction of mineral powder with a particle size not greater than 0.074mm is 100%;

[0031] (2) Mix 100% finely ground vanadium-titanium magnetite concentrate powder, binder bentonite and water in an appropriate proportion, and then prepare high-chromium vanadium-titanium magnetite oxide balls with a particle size of 11.5 mm after stewing balls, then dried;

[0032] (3) Put the dried high-chromium-type vanadium-titanium magnetite pellets into a high-temperature furnace at a furnace temperature of 300°C, and ventilate with air. Raise to 900°C at 10°C / min, then rise to 1250°C at 5°C / min, keep at this temperature for 25 minutes, take out the pellets and cool;

...

Embodiment 3

[0036] Still take the high-chromium type vanadium-titanium magnetite and bentonite in the implementation case 1 as raw materials.

[0037] The implementation steps are as follows:

[0038] (1) Use a ball mill to wet-grind the high-chromium vanadium-titanium magnetite. The fine grinding time is 15 minutes, and the volume fraction of the ore powder particle size not greater than 0.074mm is 100%;

[0039](2) After uniformly mixing 100% finely ground vanadium-titanium magnetite concentrate powder, bentonite and water in an appropriate proportion, after stewing, prepare high-chromium vanadium-titanium magnetite oxide pellets with a particle size of 12mm. then dry;

[0040] (3) Oxidation roasting. Put the dried high-chromium-type vanadium-titanium magnetite pellets into a high-temperature furnace at a temperature of 300°C, and ventilate the air, and raise it to 900°C at a rate of 10°C / min, and then rise to a roasting temperature of 1250°C at a rate of 5°C / min. ℃, after keeping a...

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Abstract

The invention discloses a gas-based shaft-furnace direct-reduction smelting method for high-chromium-content vanadium-titanium magnetite. According to the method, a shaft furnace serves as main equipment, and 100% high-chromium-content vanadium-titanium magnetite serves as a raw material. The method is characterized by comprising the steps of preparing oxidized pellets through grinding the magnetite, palletizing, oxidizing and roasting, putting the oxidized pellets in the shaft furnace, carrying out direct reduction by using reducing gas, and then, carrying out smelting separation in a high-frequency induction furnace, thereby obtaining vanadium-chromium contained pig iron and high-titanium-content slag. According to the method disclosed by the invention, the grade and yield of iron in the obtained pig iron are higher than 90%, the yield of both vanadium and chromium is higher than 85%, the grade of TiO2 in the high-titanium-content slag is about 40%, and the yield reaches 85-90%.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of metallurgical resources, and in particular relates to a gas-based shaft furnace direct reduction smelting method for high-chromium vanadium-titanium magnetite. Background technique [0002] my country's vanadium-titanium magnetite resources are relatively rich, mainly distributed in Sichuan Panxi, Hebei Chengde and other regions. According to the content of Cr2O3, vanadium-titanium magnetite is divided into ordinary vanadium-titanium magnetite and high-chromium vanadium-titanium magnetite. As a special vanadium-titanium magnetite resource, high-chromium vanadium-titanium magnetite contains precious chromium resources in addition to iron, vanadium, and titanium. For example, its chromium reserves are as high as 9 million tons. [0003] Vanadium-titanium magnetite has the characteristics of "lean", "fine", "scattered" and "miscellaneous". In addition, there are many kinds of v...

Claims

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Application Information

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IPC IPC(8): C21B13/02C22B1/243C22B1/02
Inventor 储满生唐珏柳政根陈双印
Owner NORTHEASTERN UNIV
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