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A pellet containing chromium-containing vanadium-titanium magnetite capable of improving anti-powdering performance and its preparation method

A technology of vanadium-titanium magnetite and pellets, which is applied in the field of pellets containing chromium-containing vanadium-titanium magnetite and its preparation, and can solve the problem of poor compressive strength and pulverization resistance of pellets and increased cost of finished balls , can not adapt to the high-strength smelting of blast furnaces, etc., to achieve the effect of lowering the roasting temperature, enhancing the improvement effect, improving the compressive strength and anti-powdering performance

Active Publication Date: 2020-08-11
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the pellets used in blast furnace smelting contain vanadium and titanium pellets. The compressive strength and pulverization resistance of the finished balls can meet the needs of blast furnace smelting, but the Cr-containing pellets roasted under the existing roasting system 2 o 3 The compressive strength and anti-powdering performance of the pellets are poor, and cannot meet the needs of high-strength smelting of blast furnaces. To meet the needs of high-strength smelting of blast furnaces, a series of measures such as increasing the roasting temperature must be taken, resulting in an increase in the cost of finished balls

Method used

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  • A pellet containing chromium-containing vanadium-titanium magnetite capable of improving anti-powdering performance and its preparation method
  • A pellet containing chromium-containing vanadium-titanium magnetite capable of improving anti-powdering performance and its preparation method

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preparation example Construction

[0075] The present invention also provides a method for preparing pellets containing chromium-containing vanadium-titanium magnetite, comprising the following steps:

[0076] 1) After grinding the chromium-containing vanadium-titanium magnetite and boron-magnesite, and mixing them with bentonite, a mixture is obtained;

[0077] 2) After pelletizing the mixture and water obtained in the above steps, green pellets are obtained;

[0078] 3) After roasting the green pellets obtained in the above steps, the finished pellets are obtained.

[0079] In the preparation method of the above-mentioned pellets containing chromium-containing type vanadium-titanium magnetite of the present invention, the selection and optimization principles of raw materials, ratios and other parameters are the same as those of the aforementioned pellets containing chromium-containing type vanadium-titanium magnetite, The selection and optimization principles of the ratio and other parameters are consistent...

Embodiment 1

[0093] Containing vanadium, titanium, chrome-vanadium-titanium-iron concentrate and boron-magnesium ore are dried, after high-pressure roller milling, the binder bentonite is added to form pellets, after screening, they are roasted in a shaft furnace, and the finished balls are discharged.

[0094] Ratio of materials: 96 parts of vanadium, titanium and ferrochrome concentrate, 2 parts of bentonite, 2 parts of boron magnesium ore.

[0095] See Table 1, Table 1 is the component analysis of the vanadium, titanium, chromium vanadium titanium concentrate used in the embodiment of the present invention.

[0096] Table 1

[0097] TF FeO TiO 2

Cr V 2 o 5

54.11％ 27.98％ 11.71％ 0.59％ 0.574％

[0098] Referring to Table 2, Table 2 is the composition analysis of the boronite used in the embodiment of the present invention.

[0099] Table 2

[0100] B SiO 2

CaO MgO MnO Al 2 o 3

TF 5.50％ 4.0％ 6.39％ 17.73％ 1.53 0...

Embodiment 2

[0109] Containing vanadium, titanium, chrome-vanadium-titanium-iron concentrate and boron-magnesium ore are dried, after high-pressure roller milling, the binder bentonite is added to form pellets, after screening, they are roasted in a shaft furnace, and the finished balls are discharged.

[0110] Ratio of materials: 94 parts of vanadium, titanium, ferrochrome concentrate, 2 parts of bentonite, 4 parts of boron magnesium ore.

[0111] High-pressure roller mill parameters: the diameter of the extrusion roller is 1200mm, and the width of the extrusion roller is 500mm;

[0112] Pelletizing parameters: the diameter of the disc pelletizer is 6000mm, the depth of the disc is 700mm, the water content of the raw pellets is controlled at 8.5%, and the inclination angle is 50°.

[0113] Roasting parameters: Shaft furnace roasting area 12m 2 , drying bed area 25.5m 2 , the horizontal angle of the drying bed is 40°, and the firing temperature is 1180°C.

[0114] The finished ball prep...

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Abstract

The invention provides a chromium-containing type vanadium titano-magnetite comprising pellet. The chromium-containing type vanadium titano-magnetite comprising pellet is prepared from the following raw materials in parts by weight: 90-98 parts of chromium-containing vanadium titano-magnetite, 2.0-10.0 parts of boric ores and 1.5-2.0 parts of bentonite. Boric ores and bentonite are added into thechromium-containing vanadium titano-magnetite, a special component proportion is utilized, and certain amount of boride oxides are added in a pellet preparation process, so that a roasting temperatureis favourably reduced; special composition characteristics of the boric ores and ore structures of the boric ores are utilized, so that dispersing ability, in the pellet, of the boric oxides is greatly improved, and compressive strength and chalking resistance of TiO2 and Cr2O3 containing pellet are further improved, improvement effect, on furnace slag performance, of the pellet is further strengthened, and furnace slag viscosity is further reduced in a facilitated mode. The pellet provided by the invention is beneficial for reducing pellet production cost, and improving performance of furnace slag in a blast furnace smelting process.

Description

technical field [0001] The invention belongs to the technical field of pellets containing chromium-containing vanadium-titanium magnetite, and relates to a pellet containing chromium-containing vanadium-titanium magnetite and a preparation method thereof, in particular to a powder-containing pellet that can improve anti-powdering performance A pellet of chromium-type vanadium-titanium magnetite and a preparation method thereof. Background technique [0002] Blast furnace ironmaking refers to the continuous production of liquid pig iron in a vertical reactor-blast furnace using coke, iron-containing ore (natural rich lump ore, sinter and pellet) and flux (limestone, dolomite). It is an important part of modern iron and steel production. Although many ironmaking methods have been researched and developed by countries all over the world, blast furnace ironmaking is still the main method of modern ironmaking because of its relatively simple process, large output, high labor prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/243C22B1/16
CPCC22B1/16C22B1/2406C22B1/243
Inventor 蒋胜
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP