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A process for the comprehensive utilization of vanadium-titanium magnetite by chain grate roasting-gas-based shaft furnace pre-reduction-electric furnace deep reduction

A technology of vanadium-titanium magnetite and gas-based shaft furnace, which is applied in the field of chain grate roasting-gas-based shaft furnace pre-reduction-electric furnace deep reduction and comprehensive utilization of vanadium-titanium-magnetite, which can solve the problem of vanadium-titanium magnetite oxide balls Problems such as high pulverization rate, low production efficiency, and poor economic benefits of mass reduction, to achieve the effect of improving energy utilization, improving production efficiency, and high grade

Active Publication Date: 2020-10-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems that the preparation process of oxidized pellets in the prior art requires a lot of equipment, large investment, low production efficiency, poor economic benefits, and high reduction pulverization rate of vanadium-titanium-magnetite oxidized pellets, the present invention The purpose is to provide a process for the comprehensive utilization of vanadium-titanium magnetite by grate roasting-gas-based shaft furnace pre-reduction-electric furnace deep reduction, so as to improve the existing process and realize efficient and clean utilization of iron, vanadium and titanium. At the same time reduce energy consumption and equipment investment, improve production efficiency

Method used

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  • A process for the comprehensive utilization of vanadium-titanium magnetite by chain grate roasting-gas-based shaft furnace pre-reduction-electric furnace deep reduction

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Effect test

Embodiment 1

[0027] A kind of chain grate roasting-gas-based shaft furnace pre-reduction-electric furnace deep reduction process for comprehensive utilization of vanadium-titanium magnetite, comprising the following steps:

[0028] (1) Preparation of oxidized pellets: Mix vanadium-titanium magnetite concentrate, binder, and water in proportion to make pellets to obtain qualified vanadium-titanium magnetite green pellets, and put the green pellets with a particle size of 8-20 mm into the chain Drying and oxidizing roasting in a grate machine, the drying temperature is 300°C, the oxidation roasting temperature is 950°C, and the oxidation roasting time is 60min to obtain vanadium-titanium magnetite oxidized pellets; the compressive strength of vanadium-titanium magnetite oxidized pellets 1326N / piece;

[0029] (2) Pre-reduction in gas-based shaft furnace: the vanadium-titanium-magnetite oxidized pellets are hot-loaded into the shaft furnace from the top, the hot-charging temperature is greater...

Embodiment 2

[0033] A kind of chain grate roasting-gas-based shaft furnace pre-reduction-electric furnace deep reduction process for comprehensive utilization of vanadium-titanium magnetite, comprising the following steps:

[0034] (1) Preparation of oxidized pellets: Mix vanadium-titanium magnetite concentrate, binder, and water in proportion to make pellets to obtain qualified vanadium-titanium magnetite green pellets, and put the green pellets with a particle size of 8-20 mm into the chain Drying and oxidizing roasting in a grate machine, the drying temperature is 400°C, the oxidation roasting temperature is 1050°C, and the oxidation roasting time is 40min to obtain vanadium-titanium magnetite oxidized pellets; the compressive strength of vanadium-titanium magnetite oxidized pellets is 1534N / piece;

[0035] (2) Gas-based shaft furnace pre-reduction: the vanadium-titanium-magnetite oxidized pellets are hot-loaded into the shaft furnace from the top, the hot-charging temperature is greate...

Embodiment 3

[0039] A kind of chain grate roasting-gas-based shaft furnace pre-reduction-electric furnace deep reduction process for comprehensive utilization of vanadium-titanium magnetite, comprising the following steps:

[0040](1) Preparation of oxidized pellets: Mix vanadium-titanium magnetite concentrate, binder, and water in proportion to make pellets to obtain qualified vanadium-titanium magnetite green pellets, and put the green pellets with a particle size of 8-20 mm into the chain Drying and oxidizing roasting in a grate machine, the drying temperature is 300°C, the oxidation roasting temperature is 1150°C, and the oxidation roasting time is 20min to obtain vanadium-titanium magnetite oxidized pellets; the compressive strength of vanadium-titanium magnetite oxidized pellets 1754N / piece;

[0041] (2) Gas-based shaft furnace pre-reduction: the vanadium-titanium-magnetite oxidized pellets are hot-loaded into the shaft furnace from the top, the hot-charging temperature is greater th...

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Abstract

The invention discloses a process for comprehensively utilizing vanadium-titanium magnetite through chain grate roasting, gas-based shaft furnace prereduction, and electric furnace deep reduction. Theprocess comprises the following steps: (1) oxidized pellet preparation: uniformly mixing vanadium-titanium magnetite concentrate, a binder and water in a ratio, pelletizing to obtain vanadium-titanium magnetite green pellets with qualified particle sizes, conveying the green pellets into a chain grate, and carrying out drying and oxidation roasting to obtain vanadium-titanium magnetite oxidized pellets; (2) gas-based shaft furnace prereduction; (3) electric furnace deep reduction: filing the vanadium-titanium magnetite prereduction pellets into an electric furnace and carrying out deep reduction, adding a flux and proportioned carbon, controlling a melting temperature to be 1550-1650 DEG C, and separating to obtain vanadium-containing molten iron and titanium-containing slag; and (4) using the obtained vanadium-containing molten iron for vanadium extraction in a converter, and carrying out titanium extraction on the titanium-containing slag through a sulfuric acid method. According tothe process, the reduction degradation rate for the oxidized pellets is greatly reduced, so that the requirement of the subsequent shaft furnace reduction can be met; and efficient and clean utilization for iron, vanadium and titanium is realized, and meanwhile, the cost is reduced, and the production efficiency is increased.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of vanadium-titanium ore, and in particular relates to a process for comprehensively utilizing vanadium-titanium magnetite by chain grate roasting-gas-based shaft furnace pre-reduction-electric furnace deep reduction. Background technique [0002] my country has huge reserves of vanadium-titanium magnetite resources, but the overall level of development and utilization is still very low. Taking vanadium-titanium magnetite resources in Panxi area as an example, in the production process dominated by steel, the current recovery and utilization of titanium and vanadium Therefore, improving the comprehensive utilization level of my country's vanadium-titanium magnetite resources is of great significance to the development of my country's steel and vanadium-titanium industries. [0003] Among the processing methods for vanadium-titanium magnetite concentrate, the non-blast furnace method can rea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/242C22B1/02C22B5/12C22B34/12C22B34/22
CPCC22B1/02C22B1/2406C22B1/242C22B5/12C22B34/1218C22B34/1263C22B34/22
Inventor 郭宇峰王帅陈凤郑富强杨凌志邱冠周姜涛
Owner CENT SOUTH UNIV