A preparation method of high-quality vanadium-titanium pellets with low energy consumption based on high-pressure roller mill pretreatment

A technology of high-pressure roller milling and pelletizing, which is applied in the production of pellets and the preparation of high-quality vanadium-titanium pellets with low energy consumption. It can solve the problems of affecting the oxidation reaction rate, low pellet consolidation strength, and poor pellet oxidation effect. problem, achieve the effect of promoting recrystallization connection, improving strength and reducing energy consumption

Active Publication Date: 2021-03-26
CENT SOUTH UNIV
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Problems solved by technology

The solid fusion of magnetite with titanium and magnesium affects its oxidation reaction rate. During the oxidation process, the phases such as ilmenite and perovskite between grains hinder the diffusion of oxygen in the pellets to the reaction interface, making the reaction The process is mainly controlled by diffusion, resulting in worse oxidation effect of pellets than ordinary magnetite
And the pellet product has a core-shell structure, with a clear boundary between the shell and the core. The shell is oxidized hematite from magnetite and brookite from partial ilmenite oxidation, while the core is incompletely oxidized magnetite and Substances such as ilmenite, which are not conducive to the Fe of the pellet consolidation process 2 o 3 Crystallization grows, making the pellet consolidation strength low

Method used

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  • A preparation method of high-quality vanadium-titanium pellets with low energy consumption based on high-pressure roller mill pretreatment

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Experimental program
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Effect test

Embodiment 1

[0039] Adopt the vanadium-titanium magnetite of table 1, with it under the condition of pressure 2.5MPa, iron concentrate moisture 7.5% high-pressure roller mill, the specific surface area relative change η of vanadium-titanium magnetite concentrate after roller milling S 0.23, the increase ratio of particle crack rate ΔL 5%; after roller milling, the water pressure is pressurized to 1.2MPa through the pipeline booster pump during the pelletizing process, and the water is dispersed by compressed air to form a particle size of 20-30μm The water mist beads within the range are added to the growing area of ​​the pelletizing disc to make pellets, and the proportion of particle size 13-15mm reaches 88%; the adjusted material height is 180mm×(1+0.23 2 )=190mm, machine speed 2.5 / (1+0.23 2 )=2.37m / min, adjust the preheating temperature 970-0.23×80-0.05×120=946°C, and the calcination temperature 1275-0.23×100=1252°C. After roasting, the pellet oxidation rate is 97%, the residual FeO c...

Embodiment 2

[0041] Adopt the vanadium-titanium magnetite of table 1, with it under the condition of pressure 3MPa, iron concentrate moisture 7.0% high-pressure roller mill, the specific surface area relative change η of vanadium-titanium magnetite concentrate after roller milling S 0.30, the increase ratio of particle crack rate ΔL 7%; after roller milling, pressurize the water pressure to 1MPa through the pipeline booster pump, and disperse the water through compressed air to form water mist with a particle size in the range of 30-40μm Beads are added to the growing area of ​​the pelletizing disk, and it is made into pellets, and the proportion of particle size 13-15mm reaches 90%; the adjustment material height is 180mm×(1+0.3 2 )=196mm, machine speed 2.5 / (1+0.3 2 )=2.29m / min, adjust the preheating temperature 970-0.3×80-0.07×120=938°C, and the calcination temperature 1275-0.3×100=1245°C. After roasting, the pellet oxidation rate is 98%, the residual FeO content is 0.6%, the pellet str...

Embodiment 3

[0043] Adopt the vanadium-titanium magnetite of table 1, with it under the condition of pressure 2.75MPa, iron concentrate moisture 6.5% high-pressure roller mill, the specific surface area relative change η of vanadium-titanium magnetite concentrate after roller milling S 0.25, the increase ratio of particle crack rate ΔL 4%; after roller milling, the water pressure is pressurized to 1.1MPa through the pipeline booster pump during the pelletizing process, and the water is dispersed by compressed air to form a particle size of 30-40μm The water mist beads within the range are added to the growing area of ​​the pelletizing disc to make pellets, and the proportion of particle size 13-15mm reaches 87%; the adjustment material height is 180mm×(1+0.25 2 )=191mm, machine speed 2.5 / (1+0.25 2 )=2.35m / min, adjust the preheating temperature 970-0.25×80-0.04×120=945°C, and the calcination temperature 1275-0.25×100=1250°C. After roasting, the pellet oxidation rate is 97%, the residual Fe...

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Abstract

The invention discloses a preparation method based on high-pressure roll-grinding pretreatment and used for low-energy-consumption and high-quality vanadium-titanium pellet ores. According to the method, the specific surface area and the particle size composition of vanadium-titanium magnetite are improved by controlling the conditions of high-pressure roll-grinding, and meanwhile, the compact structure of vanadium-titanium magnetite particles are broken by virtue of the high-pressure roll-grinding, so that favorable conditions are provided for pelletization and oxidation-solidification for the vanadium-titanium magnetite; pelletization and roasting methods suitable for the vanadium-titanium magnetite subjected to the high-pressure roll-grinding are developed according to the structure andsurface characteristics of the vanadium-titanium magnetite subjected to the high-pressure roll-grinding; and uniform oxidation and efficient solidification for the vanadium-titanium magnetite are realized through the coupling action of the high-pressure roll-grinding pretreatment, pellet particle size control, thermal process optimization and the like, so that the strength of the vanadium-titanium ore pellets is greatly increased, the energy consumption of the roasting process is reduced, and then the high-quality vanadium-titanium pellet ores are prepared.

Description

technical field [0001] The invention relates to a method for producing pellets, in particular to a method for preparing high-quality vanadium-titanium pellets with low energy consumption based on high-pressure roller mill pretreatment, and belongs to the field of iron ore pellet preparation in iron and steel metallurgy. Background technique [0002] The reserves of vanadium-titanium magnetite in the world are large, and the proven reserves have reached 40 billion tons. my country's vanadium-titanium magnetite deposits are widely distributed and rich in reserves, mainly distributed in Panxi area of ​​Sichuan, Chengde of Hebei, Hanzhong of Shaanxi, Xiangyang of Hubei, Xingning of Guangdong and Daixian of Shanxi. my country's Panxi region has very rich vanadium-titanium iron ore resources, and the accumulated proven reserves of vanadium-titanium iron ore are nearly 10 billion. [0003] Blast furnace smelting is the main process for the utilization of vanadium-titanium magnetit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C22B1/02C22B1/00
CPCC22B1/00C22B1/02C22B1/2406
Inventor 甘敏范晓慧陈许玲季志云孙伟黄晓贤高志勇袁礼顺王殊汪国靖
Owner CENT SOUTH UNIV
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