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A method for pretreating high-titanium vanadium-titanium magnetite to prepare pellets

A kind of technology of vanadium titanomagnetite and high titanium type

Active Publication Date: 2018-12-07
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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  • A method for pretreating high-titanium vanadium-titanium magnetite to prepare pellets

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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 1-60min, and the b...

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 pretreating high-titanium vanadium-titanium magnetite to prepare pellets, which includes the following steps: using grinding equipment to perform fine ball milling pretreatment on high-titanium vanadium-titanium magnetite; drying; and drying the dried vanadium-titanium magnetite. Dry mix the mineral powder and bentonite, then spray water to wet mix; place the wet mixed raw materials at 25 to 30°C for simmering and then put them into a pelletizing machine to prepare green balls; dry the green balls; then roast them. The pellets are heated to 800-900°C; then, the temperature is raised to 1140-1180°C for roasting; then, the temperature is lowered to 300°C, then taken out and air-cooled. The method of the present invention effectively improves the ball-forming performance and ball-forming speed of high-titanium vanadium-titanium magnetite, so that the strength of green balls can be optimized, and the roasting temperature is low and the time is short, so that it can meet the requirements of compressive strength of cooked balls. The production efficiency of high-titanium vanadium-titanium magnetite pellets is significantly improved.

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 Patents(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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