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A kind of high chromium vanadium titanium pellets

A technology of high-chromium vanadium-titanium pellets and vanadium-titanium ore, which is applied in the field of pellets, can solve the problems of unfavorable blast furnace smelting, high reduction expansion rate, and low compressive strength of pellets, so as to improve metallurgical properties and reduce powder , The effect of reducing the cost per ton of iron

Active Publication Date: 2017-05-24
ANGANG STEEL CO LTD
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  • Description
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Problems solved by technology

[0008] However, the above measures are all to improve the reduction expansion rate of pellets when ordinary concentrates are used in pellet production, and the only high-chromium vanadium-titanium ore used in the research of pellet production, its maximum mass in the mixture The fraction is about 40%, the pellets have low compressive strength and high reduction expansion rate, which is not conducive to the smooth progress of blast furnace smelting

Method used

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  • A kind of high chromium vanadium titanium pellets
  • A kind of high chromium vanadium titanium pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 and the comparative example raw material composition mass percentage content of prior art are shown in Table 1.

[0024] Table 1 Example 1 and comparative example raw material composition mass percentage content table

[0025] raw material Iron Concentrate % High chromium vanadium titanite% Magnesium boron concentrate% Added bentonite% Example 1 56.8 42 1.2 1

[0026] comparative example 60 40 0 1

[0027] The iron concentrate, high-chromium vanadium-titanium ore, boron-magnesium concentrate and added bentonite are weighed according to the ratio in Table 1, and then mixed with a powerful mixer, and the mixed material is mixed with a disc pelletizer The pellets are formed, and the pellets are roasted using a conventional rotary kiln process.

[0028] The pellets produced in Example 1 and Comparative Example were tested experimentally, and the performance test results are shown in Table 2.

[0029] Table 2 Pe...

Embodiment 2

[0033] See Table 3 for the mass percentage content of the raw materials in Example 2 and the comparative example of the prior art.

[0034] Table 3 Example 2 and comparative example raw material composition mass percentage content table

[0035] raw material Iron Concentrate % High chromium vanadium titanite% Magnesium boron concentrate% Added bentonite% Example 2 40.2 58 1.8 2.2 comparative example 60 40 0 2.2

[0036] The iron concentrate, high-chromium vanadium-titanium ore, boron-magnesium concentrate and added bentonite are weighed according to the ratio in Table 3, and then mixed with a powerful mixer, and the mixed material is mixed with a disc pelletizer The pellets are formed, and the pellets are roasted using a conventional rotary kiln process.

[0037] The pellets produced in Example 2 and Comparative Example were tested experimentally, and the performance test results are shown in Table 4.

[0038] Table 4 Performance inspec...

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Abstract

The invention provides high Cr-V-Ti pellet ore. The raw materials of the high Cr-V-Ti pellet ore comprise, in percent by mass, 38-59% of iron ore concentrate, 42-60% of high Cr-V-Ti ore, 1-2% of B-Mg concentrate, and 1-2.5% of externally-added bentonite, the percentage of B-Mg concentrate with the granularity less than 0.074 mm is 85% or more, and the percentage of the iron ore concentrate with the granularity of 0.074 mm or less is 90% or more. The chemical compositions of the B-Mg concentrate comprises, in percent by mass, 50.35-66.86% of TFe, 3.88-9.29% of SiO2, 0.49-1.89% of CaO, 9.88-21.68% of MgO, 0.21-0.36% of Al2O3, and 1.20-4.36% of B. According to the technical scheme, the pellet ore metallurgy performance is effectively improved, the pellet ore production cost is reduced, and the produced high Cr-V-Ti pellet ore possesses the average compressive strength up to 2992 N per unit, the average reduction expansion rate of 10.65%, does not explode at a temperature of 450 DEG C, and possesses the performance indexes far better than those of pellet ores produced according to the prior art. By using the pellet ore disclosed by the invention, powder during blast-furnace smelting is reduced and blast-furnace production is guaranteed to be stably successively performed.

Description

technical field [0001] The invention belongs to the technical field of ironmaking pellet production, in particular to a pellet containing more high-chrome vanadium-titanium ore components. Background technique [0002] Most iron ore pellets have good metallurgical properties, such as low pulverization rate at low temperature and excellent reducibility, etc., but another important metallurgical performance index of pellets—reduction expansion rate is not necessarily ideal. The reduction expansion rate of ore is just crucial to blast furnace production. This is because in the blast furnace smelting process, the most important requirement is that the charge in the entire blast furnace should have sufficient stability and air permeability when it passes through various reduction stages, especially in the upper part of the blast furnace, although the charge is weak at low temperature. In the reducing atmosphere, but the furnace charge stays for a long time, so the pellets as one...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/243
Inventor 徐礼兵周明顺翟立委刘杰张辉
Owner ANGANG STEEL CO LTD
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