Novel additive for improving tumbler strength of vanadium-titanium magnet sintered ore

A technology of drum strength and vanadium-titanium magnet, applied in the field of sintering in iron and steel enterprises, can solve the problems of low yield of vanadium-titanium sintered ore, high pulverization rate, small particle size of vanadium-titanium sintered ore, etc.

Active Publication Date: 2017-01-11
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

Therefore, the yield of vanadium-titanium sintered ore is low and the strength is poor
Vanadium-titanium sinter has problems such as small particle size, poor cold strength, high pulverization rate during operation, and large amount of ore returned under the blast furnace tank, which seriously affects the smooth operation of the blast furnace and restricts the cost reduction of the ironmaking system

Method used

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  • Novel additive for improving tumbler strength of vanadium-titanium magnet sintered ore
  • Novel additive for improving tumbler strength of vanadium-titanium magnet sintered ore
  • Novel additive for improving tumbler strength of vanadium-titanium magnet sintered ore

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specific Embodiment 1

[0026] Dissolve a certain amount of reagent in an appropriate amount of water to make a solution and add it to the mixed iron material for sintering cup test. After the test, a certain proportion of finished sintered ore is taken for drum strength testing. The sintering test parameters and drum strength test results are shown in Table 1.

[0027] Table 1 Test results of additive sintered cup %

[0028]

[0029] It can be seen from Table 1 that the finished product rate of vanadium-titanium magnetite sintered raw ore (sample 1) is 80.50%, and the drum strength is 58.57%. The yield rate of sample 2 (addition amount is 0.4‰) is 81.02%, and the drum strength is 59.38%. The drum strength of sample 2 is slightly higher than that of sintered ore. Sample 3 (with an addition of 0.5‰) had a yield of 80.79% and drum strength of 60.80%. The finished product rate of sample 4 (addition amount is 0.6‰) is 80.51%, and the drum strength is 62.03%. Compared with the raw sintered ore (sampl...

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Abstract

The invention provides a novel additive for improving tumbler strength of vanadium-titanium magnet sintered ore. The novel additive contains, by weight percentage, 10-30% of B2O3, 5-20% of NaCl, 3-9% of NaNO3 and 45-85% of CaCl2, and the addition amount is 0.04-0.06%. The additive is added in a manner that the additive is prepared into a solution, the solution is added to a sintering mixed material when mixing for the first time is conducted, and a sintering test is conducted. It is indicated through test results that the content of magnetite, the content of hematite and the content of perovskite in the sintered ore are decreased; the content of calcium ferrite, the content of dicalcium silicate and the content of vitreous substances are increased; the air hole rate of the sintered ore is reduced; the proportion of maculosus-granular structures which are poor in strength in an ore phase structure is reduced; the proportion of corrosion structures which are good in strength is increased; the ore phase structure becomes more uniform; and furthermore, compared with that of sintered ore with no additive added, tumbler strength is improved by 1.5-3.5%.

Description

technical field [0001] The invention relates to a novel additive for improving the drum strength of vanadium-titanium magnet sintered ore, and is especially suitable for the sintering field of iron and steel enterprises. Background technique [0002] Vanadium-titanium magnetite is an important mineral resource. It is not only an important type of iron ore, but also the main carrier of vanadium-titanium resources. Compared with ordinary ore, the TFe in vanadium-titanium iron powder is lower, and TiO 2 、Al 2 o 3 / SiO 2 High, the initial melting point of the sintered material is above 1400°C, and the softening range is narrow, less than 100°C. Due to SiO 2 Low content, even if the sintering alkalinity is high, the relative content of CaO added is small, it is difficult to improve the strength of sinter by developing a large amount of ferrite system, and the content of calcium ferrite in sinter is only 2% to 6%. Therefore, the yield and strength of vanadium-titanium sinter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16C22B1/243
CPCC22B1/16C22B1/2406C22B1/243
Inventor 刘小杰郄亚娜孙艳芹李红玮吕庆刘然刘朝卿张琦
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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