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

A vanadium-titanium magnetite and fluidization technology, which is applied in metallurgy and chemical industry, can solve the problems of low reduction temperature, failure to solve the contradiction of high temperature and high reduction efficiency, and insufficient consideration of the mineral characteristics of vanadium-titanium magnetite.

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

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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 considering the loss of cohesive flow control, the final reduction temperature is low, and the reduction efficiency is inevitably low.
These vanadium-titanium-magnetite powder ore fluidized bed gas-based direct reduction processes generally directly adopt multi-stage serial fluidized bed schemes similar to non-blast furnace ironmaking FIOR, Circored, and FINMET, or install a furnace tail gas preheating system in front of the fluidized bed , only for the purpose of drying and dehydrating and simply increasing the temperature of fine ore into the furnace, the principle of mineral reaction is the same as that of ordinary iron concentrate fluidized bed gas-based direct reduction, and does not fully consider the mineral characteristics of vanadium-titanium magnetite itself, nor does it Solve the contradiction between high temperature and high reduction efficiency and possible high temperature and high metallization rate of fine ore

Method used

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

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Embodiment 1

[0085] Such as figure 1 As shown, a vanadium-titanium magnetite fluidized redox system, the system includes fine ore silo and feeder 0, fine ore preheater 1, oxidation bed 2, pre-reduction bed 3, final reduction bed 4 and 5, a product silo 6, a heat exchanger 7, a scrubber 8, a reducing tail gas pressurizer 9, a carbon dioxide remover 10, and a reducing gas pressurizer 16.

[0086] 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 pre-reduction bed 3 includes a pre-reduction fluidized bed body 30 , a pre-reduction bed outlet 32 ​​, a second pre-reduc...

Embodiment 2

[0096] The method for carrying out the fluidized redox system of vanadium-titanium-magnetite by adopting the above-mentioned vanadium-titanium-magnetite fluidized redox system comprises the following steps: the vanadium-titanium-magnetite powder ore is discharged from the powder ore silo and the feeder 0 The outlet enters the gas outlet of the first-stage cyclone separator 11 and exchanges heat with the oxidized 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 the outlet at the bottom enters the inlet of the first-stage cyclone separator 11 and then exchanges heat with the oxidation tail gas from the outlet of the oxidation bed cyclone separator 24, and then enters the feed port of the first feeder 14 of the oxidation bed . The fine powder ore entrained by the gas outlet of the second-stage cyclone s...

Embodiment 3

[0098] 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, oxidation treatment is first carried out in an oxidation fluidized bed, oxidized at 800°C for 30 minutes, the oxidation gas velocity is 0.29m / s, the operating pressure is 2.0atm, the oxidation gas is air, vanadium-titanium-magnetite The oxidation degree of ferrous iron reaches 39.61%. Subsequently, the oxidized vanadium-titanium-magnetite powder ore enters the pre-reduction fluidized bed for pre-reduction at 780° C. for 15 minutes. Then enter the final reduction fluidized bed for final reduction, the final reduction temperature is 860°C, and the final reduction time is 70 minutes in total. The gas velo...

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Abstract

The invention discloses a system and a method for vanadium titano-magnetite fluidization oxidation and reduction. A four-section fluidized bed is adopted to carry out fluidization oxidation and reduction on vanadium titano-magnetite fine ore; and a fluidized bed reaction body is formed by boiling beds connected in series. Through the technological design of a pre-oxidation treatment and low-gas-velocity reaction fluidized bed, the vanadium titano-magnetite powder fluidization performance can be obviously improved, the reaction efficiency is improved, and the process energy consumption is reduced. The vanadium titano-magnetite fine ore is firstly preheated and dried, enters a low-temperature oxidation bed so as to be subjected to oxidation treatment, then enters a prereduction bed so as to be subjected to prereduction, and finally complete final reduction through a two-stage high-temperature final reduction bed; oxidization tail gas is used for preheating and drying the vanadium titano-magnetite fine ore; after reduction tail gas is heat-exchanged with oxidization air, oxidization components are cleaned and removed, and the reduction tail gas is recycled; and a gas utilization scheme has the advantages of high reaction efficiency and high energy utilization ratio.

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 fluidized redox 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 contains low titanium grade (TiO 2 <14wt.%), mainly used as blast furnace raw materials to smelt iron and vanadium, and it needs to be diluted with ordinary iron ore, and finally due to 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 in it. The direct r...

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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