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A system and method for fluidized high-temperature rapid redox of vanadium-titanium magnetite

A vanadium-titanium magnetite, high-temperature and rapid technology, applied in the fields of chemical industry and metallurgy, can solve the problems of high gas velocity, low reduction temperature, and low reduction efficiency

Active Publication Date: 2019-05-17
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the reaction efficiency of the first circulating fluidized bed is high and the powder ore has no caking, the required gas velocity is high
The gas velocity used in the second stage is low, but the final reduction temperature is very low in consideration of cohesive loss flow control, and the reduction efficiency is inevitably very low

Method used

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  • A system and method for fluidized high-temperature rapid redox of vanadium-titanium magnetite

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Experimental program
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Effect test

Embodiment 1

[0064] like figure 1 As shown, a fluidized high-temperature rapid oxidation-reduction system of vanadium-titanium magnetite, the system includes fine ore silo and feeder 0, fine ore preheater 1, oxidation bed 2, the first reduction bed 3 and the second Two reduction bed 4, product silo 5, heat exchanger 6, scrubber 7, reduction tail gas pressurizer 8, carbon dioxide remover 9, reduction gas pressurizer 16.

[0065] The fine ore preheater 1 includes a first-stage cyclone separator 11 , a second-stage cyclone separator 12 , a third-stage cyclone separator 13 , a first feeder 14 for an oxidation bed, and a second feeder 15 for an oxidation bed. The oxidation bed 2 includes an oxidation fluidized bed body 20 , an oxidation bed gas heater 21 , a first discharge device 22 for an oxidation bed, a second discharge device 23 for an oxidation bed, and a cyclone separator 24 for an oxidation bed. The first reduction bed 3 includes a primary reduction fluidized bed body 30, a primary red...

Embodiment 2

[0075] The method for carrying out the fluidized redox of vanadium-titanium-magnetite by the above-mentioned vanadium-titanium-magnetite fluidized high-temperature rapid redox system comprises the following steps: The outlet enters the gas outlet of the first-stage cyclone separator 11 and exchanges heat with the oxidation tail gas from the outlet of the oxidation bed cyclone separator 24, then enters the inlet of the second-stage cyclone separator 12, and is separated by the second-stage cyclone separator 12 , the coarse powder ore discharged from its bottom discharge port enters the inlet of the first stage cyclone separator 11 and enters the feed port of the oxidation bed feeder 14 after exchanging heat with the oxidation tail gas from the outlet of the oxidation bed cyclone separator 24 . The fine powder ore entrained by the gas outlet of the second-stage cyclone separator 12 is separated by the second-stage cyclone separator 13 and then directly enters the feed port of th...

Embodiment 3

[0077] Adopt the present invention to process raw ore chemical composition wt.% to be 55.86% TFe, 15.00% FeO, 63.19% Fe 2 o 3 , 13.71%TiO 2 , 2.21% SiO 2 , 1.16% MgO, 3.18% Al 2 o 3 , 1.57% V 2 o 5, 0.22% CaO vanadium-titanium magnetite powder ore, the powder ore particle size is 0.01-0.3mm. According to the present invention, after the fine ore is preheated and dried, it is first oxidized in an oxidizing fluidized bed, oxidized at 825°C for 15 minutes, the oxidizing gas velocity is 0.22m / s, the operating pressure is 3.1atm, the oxidizing gas is air, vanadium-titanium-magnetite The oxidation degree of ferrous iron reaches 43.17%. Subsequently, the oxidized vanadium-titanium-magnetite powder enters the reduction fluidized bed for reduction, the reduction temperature is 860°C, and the reduction time is 90 minutes in total. The gas velocity of the two reducing beds is 0.76m / s, the operating pressure is 6.8atm, the reducing gas is coal gas, the final metallization rate can...

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Abstract

The invention discloses a system and method for vanadium-titanium magnetite ore powder fluidized high temperature rapid oxidation and reduction. The system adopts three boiling fluidized beds connected in series to carry out vanadium-titanium magnetite ore powder fluidized high temperature rapid oxidation and reduction treatment. The vanadium-titanium magnetite ore powder is preheated and dried, then is fed into an oxidized bed and then is subjected to high temperature oxidation treatment, the product is fed into two stages of reduction beds and is subjected to high temperature reduction, oxidation tail gas is used for preheating and drying vanadium-titanium magnetite ore powder, the reduced tail gas undergoes heat exchange with the oxidized air, then the oxidized component is removed through cleaning and the reduction tail gas is recycled. The pre-oxidization treatment unit and the low gas velocity fluidized bed are connected in series so that high temperature fluidization performances of the vanadium-titanium magnetite ore powder are obviously improved, ore reaction efficiency is improved and process energy consumption is reduced. The system and method have the advantages of high reaction efficiency and high energy utilization rate.

Description

technical field [0001] The invention belongs to the fields of chemical industry and metallurgy related to vanadium-titanium-magnetite, and in particular relates to a system and method for fluidizing high-temperature rapid oxidation-reduction of vanadium-titanium-magnetite powder ore. Background technique [0002] Vanadium and titanium are recognized as rare resources and important strategic substances in the world. About 98% of the world's vanadium reserves and 91% of the titanium reserves occur in composite minerals dominated by vanadium-titanium magnetite. Generally speaking, vanadium-titanium magnetite (TiO 2 <14wt.%) is mainly used as blast furnace raw material for smelting iron and vanadium, and it needs to be diluted with ordinary iron ore, and finally due to the TiO in blast furnace slag 2 Low enrichment (~22wt.%), complex phase containing titanium (Ti x o y , Ti(C,N)), fine particle size dispersion (<10um), it is difficult to recover the titanium resources i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00C21B13/14
CPCC21B13/0033C21B13/0073C21B13/146
Inventor 孙昊延朱庆山潘锋王珍
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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