Method for preparing pellet by pre-treating high titanium type vanadium-titanium magnetite

A technology of vanadium-titanium magnetite and high-titanium type is applied in the field of pretreatment of high-titanium type vanadium-titanium magnetite to prepare pellets, which can solve the problems of decreased green pellet strength, long preheating time, pellet quality, etc. The effect of slowing down the rate of water evaporation, reducing the amount of water loss, and improving the performance of the ball

Active Publication Date: 2017-11-28
NORTHEASTERN UNIV LIAONING
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AI Technical Summary

Problems solved by technology

[0004] When the existing technology is used to process the high-titanium vanadium-titanium magnetite in Panxi Hongge to prepare pellets, the high-titanium vanadium-titanium magnetite selected after a stage of grinding has uneven particle size, and the surface of the large iron ore particles is relatively rough. Smooth, part of the particle surface is rough, and has the characteristics of sharp edges and corners, and the ball forming property is poor; in addition, due to the poor hydrophilicity of vanadium-titanium magnetite, it is sensitive to water, and small-scale movement of water in the process of pelletizing will also cause ball formation The strength is obviously reduced, and the burst temperature of the green balls made is low. A large amount of powder is produced during the drying process of the green balls, which obviously reduces the production efficiency. In severe cases, the production process cannot be carried out normally.
In addition, in the existing preparation process of vanadium-titanium pellets, there are still problems such as long preheating time, large roasting time and temperature range, pellet quality, element transformation and metallurgical properties are not clear.
Therefore, it is more difficult to produce pellets from high-titanium vanadium-titanium magnetite

Method used

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  • Method for preparing pellet by pre-treating high titanium type vanadium-titanium magnetite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A method for preparing pretreated high-titanium type vanadium-titanium magnetite pellets, the method comprising:

[0046] 1. Pretreatment

[0047] Take high-titanium vanadium-titanium magnetite and finely grind high-titanium vanadium-titanium magnetite in conical ball mill, horizontal ball mill or dry slag ball mill and other grinding equipment to obtain high-titanium vanadium-titanium magnet Mineral powder. Among them, the parameters of the conical ball mill are: the grinding capacity is 4kg, the rotating speed is 90r / min, the grinding concentration is 65% to 75%, the ball loading capacity is 10kg, and the ball milling time is 1 to 60min; the parameters of the horizontal ball mill are: The ore quantity is 2-5kg, the speed is 35-55r / min, the ball milling time is 1-60min, and the ball loading capacity is 25kg; the parameters of the dry-type mineral powder ball mill are: the grinding quantity is 2-5kg, the speed is 30-45r / min, The ball milling time is 1-60 minutes, and ...

Embodiment 2

[0072] A method for pretreating high-titanium vanadium-titanium magnetite to prepare pellets, the present embodiment is based on embodiment 1, and the specific operation steps are as follows:

[0073] 1. Pretreatment

[0074] Take 4kg of high-titanium vanadium-titanium magnetite in a conical ball mill with a rotating speed of 90r / min, a grinding concentration of 70%, a ball loading capacity of 10kg, and a ball milling time of 30min.

[0075] After grinding, the particle size distribution of the high-titanium vanadium-titanium magnetite was measured by wet sieving, and 92% of the particles had a particle size smaller than 75 μm.

[0076] 2. Raw material drying

[0077] The pretreated high-titanium vanadium-titanium magnetite was dried in a draft drying oven at a temperature of 108°C for 2 hours, and the moisture content of the dried high-titanium vanadium-titanium magnetite was measured to be 1.13%.

[0078] 3. Mixing stage

[0079] Add 0.6% of its weight of calcium-based be...

Embodiment 3

[0094] This embodiment is on the basis of embodiment 1, concrete operation is as follows:

[0095] 1. Pretreatment

[0096] Take 5 kg of high-titanium vanadium-titanium magnetite in a horizontal ball mill with a rotating speed of 40 r / min, a ball loading capacity of 25 kg, and a ball milling time of 25 min.

[0097] After grinding, the particle size distribution of the high-titanium vanadium-titanium magnetite was measured by wet sieving, and 86% of the particles had a particle size smaller than 75 μm.

[0098] 2. Raw material drying

[0099] The pre-grinded high-titanium vanadium-titanium magnetite and 0.7% by weight of hydrogen-based bentonite were dried in a draft drying oven at 105°C for 2.1 hours, and the water content of the iron ore was measured to be 1.15%.

[0100] 3. Mixing stage

[0101] Add hydrogen-based bentonite to high-titanium vanadium-titanium magnetite powder for 18 minutes of dry mixing. After the dry mixing is completed, use a high-pressure sprayer to e...

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Abstract

The invention relates to a method for preparing a pellet by pre-treating high titanium type vanadium-titanium magnetite. The method comprises the following steps of carrying out fine ball milling pretreatment on the high titanium type vanadium-titanium magnetite by using an ore milling device, so as to enable the proportion of the particle size, which is less than 75 microns, of magnetite powder to be greater than 85 to 95 percent; drying, so as to enable the moisture of the high titanium type vanadium-titanium magnetite powder to be less than or equal to 1.3 percent; dry-mixing the dried magnetite powder and bentonite for 15min to 20min, and subsequently, spraying water, and wet-mixing for 15min to 20min; putting a wet-mixed raw material in a condition of 25 to 30 DEG C, braising the material for 25min to 35min, then putting into a pelletizer, and preparing a green pellet with a diameter of 10mm to 12.5mm; drying the green pellet; afterwards, roasting, and raising the temperature of the pellet to 800 to 900 DEG C according to a temperature rise rate of 10 to 12 DEG C per minute; afterwards, raising the temperature to 1,140 to 1,180 DEG C according to a temperature rise rate of 4 to 6 DEG C per minute, and roasting for 10min to 15min; subsequently, lowering the temperature according to a temperature fall rate of 5 to 8 DEG C per minute, taking out after the temperature is fallen to 300 DEG C, and carrying out air cooling. The method provided by the invention can be used for effectively improving the pelletizing performance and the pelletizing speed of the high titanium type vanadium-titanium magnetite, is used for enabling the strength of the green pellet to be best, moreover, is lower in roasting temperature and shorter in time, can be used for meeting the requirement of the compression strength of a mature pellet, and is used for obviously improving the production efficiency of the pellet of the high titanium type vanadium-titanium magnetite.

Description

technical field [0001] The invention belongs to the production technology of ironmaking raw materials, and in particular relates to a method for pretreating high-titanium vanadium-titanium magnetite to prepare pellets. Background technique [0002] With the development of vanadium-titanium magnetite smelting technology, the valuable elements Fe, Ti, V, Cr, etc. in high-titanium vanadium-titanium ore have been effectively utilized, and the comprehensive utilization of blast furnace titanium slag, steel slag and other tailings resources It provides my country with valuable resources of titanium, chromium and vanadium. With the advancement of vanadium-titanium magnetite beneficiation technology and the reduction of beneficiation costs, the output and iron grade of vanadium-titanium magnetite have been improved. Sichuan is the vanadium-titanium magnetite area with the largest reserves in China. The vanadium-titanium magnetite in the Panxi Hongge area is a complex multi-element c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24
CPCC22B1/2406
Inventor 薛向欣汤卫东杨松陶杨合姜涛
Owner NORTHEASTERN UNIV LIAONING
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