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Low-grade vanadium titano-magnetite oxidized pellet expansion restraining and upgrading process for gas-based shaft furnace

A technology of vanadium-titanium magnetite and oxidation pellets, which is applied in the field of metallurgy, can solve the problems of increasing the cost of oxidation and roasting, and achieve the effect of improving reducibility

Active Publication Date: 2016-08-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oxidation roasting process of the pellets prepared by this method needs to ensure an atmosphere of CO≤20%, which greatly increases the cost of oxidation roasting

Method used

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  • Low-grade vanadium titano-magnetite oxidized pellet expansion restraining and upgrading process for gas-based shaft furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Get 5kg vanadium-containing titanium magnetite, wherein 59wt% TFe, 13wt% TiO 2 , 11wt% (CaO+MgO+SiO 2+Al 2 o 3 ), the particle size below 0.074mm accounts for more than 80%. Based on vanadium-titanium-magnetite, 30g of composite binder and 50g of additives are added externally according to mass percentage, stirred on a mixer for 6 minutes, and then 5% water is added externally, and stirred for 10 minutes. Pellet the mixture in a disc pelletizer, sieve, put 10-12mm green balls into a roasting cup, and use liquefied petroleum gas to oxidize and roast according to the following roasting system: drying starts at room temperature, and heats up to 350°C. Constant temperature for 8 minutes, air volume 35m 3 / h; then heat up to 900°C, keep the temperature constant for 15 minutes, and air volume 15m 3 / h; continue to heat up to 1200°C, keep the temperature constant for 25 minutes, and the air volume is 15m 3 / h; soaking section temperature 1150°C, time 5min, air volume 15m...

Embodiment 2

[0040] Get 5kg vanadium-containing titanium magnetite, wherein 50wt% TFe, 9wt% TiO 2 , 11wt% (CaO+MgO+SiO 2 +Al 2 o 3 ), the particle size below 0.074mm accounts for more than 65%. Based on vanadium-titanium-magnetite, 30g of composite binder and 50g of additives are added externally according to mass percentage, stirred on a mixer for 6 minutes, and then 6% water is added externally, and stirred for 10 minutes. Ball the mixture in a disc pelletizer, sieve, put 10-12mm green balls into a roasting cup, use liquefied petroleum gas to oxidize and roast according to the following roasting system: drying starts from room temperature, heats up to 300 °C, and keeps the temperature constant 10min, air volume 35m 3 / h; then heat up to 950°C, keep the temperature constant for 10 minutes, and air volume 15m 3 / h; continue to heat up to 1250°C, keep the temperature constant for 20 minutes, and the air volume is 15m 3 / h; soaking section temperature 1150°C, time 5min, air volume 15m ...

Embodiment 3

[0042] Get 5kg vanadium-containing titanium magnetite, wherein 55wt% TFe, 10wt% TiO 2 , 8wt% (CaO+MgO+SiO 2 +Al 2 o 3 ), the particle size below 0.074mm accounts for more than 80%. Based on vanadium-titanium-magnetite, 30g of composite binder and 50g of additives are added externally according to mass percentage, stirred on a mixer for 6 minutes, and then 4% water is added externally, and stirred for 10 minutes. Ball the mixture in a disc pelletizer, sieve, put 10-12mm green balls into a roasting cup, use liquefied petroleum gas to oxidize and roast according to the following roasting system: drying starts from room temperature, heats up to 300 °C, and keeps the temperature constant 10min, air volume 35m 3 / h; then heat up to 1000°C, keep the temperature constant for 10 minutes, and air volume 15m 3 / h; continue to heat up to 1300 ℃, constant temperature for 15 minutes, air volume 15m 3 / h; soaking section temperature 1150°C, time 5min, air volume 15m 3 / h, then cool to...

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Abstract

The invention provides a low-grade vanadium titano-magnetite oxidized pellet expansion restraining and upgrading process for a gas-based shaft furnace. The process includes the steps that with vanadium titano-magnetite as the datum, 0.08-0.5% by mass of a composite binder and 0.4-1.2% by mass of an additive are added (the adding sequence of the composite binder and the additive is random) into vanadium titano-magnetite powder and then evenly mixed, then 5-7% by mass of water is added and evenly mixed, a disc pelletizer is used for making pellets, and screening is carried out; and green pellets obtained after screening are subjected to oxidizing roasting on a roasting furnace according to a certain roasting system, so that oxidized pellets are obtained. According to the process, an organic binder and bentonite are composited to serve as the pellet binder, so that the thermal-state metallurgical performance such as reducibility, low-temperature reduction degradation and reduction expansion of the pellets is improved. The vanadium titano-magnetite oxidized pellets produced according to the technical scheme play an important role in expansion restraining and upgrading of a subsequent gas-based shaft furnace reduction process.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a process for suppressing swelling and improving quality of low-grade vanadium-titanium magnetite oxidation pellets used in a gas-based shaft furnace. Background technique [0002] The current vanadium-titanium magnetite reduction process, no matter using traditional blast furnace, coal-based rotary hearth furnace or rotary kiln, not only has high requirements on the grade of the ore itself, but also cannot efficiently recover high-priced components, especially titanium The effective recovery of titanium dioxide is not conducive to the needs of the development of the titanium dioxide industry. The gas-based shaft furnace direct reduction process brings opportunities for the efficient recovery of high-priced components of vanadium-titanium magnetite resources. However, in the current technology, the vanadium-titanium-magnetite oxide pellets are prone to "catastrophic" expansion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242C21B13/02
CPCC21B13/02C22B1/2406C22B1/242
Inventor 李烈军彭政务陈松军周峰高吉祥张河健胡玲卢布
Owner SOUTH CHINA UNIV OF TECH
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