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Vanadium-titanium sinter and preparation method thereof

A technology of vanadium-titanium sinter and vanadium-titanium iron concentrate, which is applied in the field of vanadium-titanium sintering, can solve the problems of high cost, poor spheroidization and water absorption, and restrict the smelting strength of blast furnace, so as to reduce the cost of raw materials and achieve high mechanical strength. Effect

Inactive Publication Date: 2015-08-19
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

However, due to the dwindling of common iron ore resources, the cost continues to rise, making the raw material cost of sinter more dependent on the market
[0003] The sea sand vanadium-titanium iron concentrate reserves in Indonesia and surrounding areas are very rich, and the price is low and the source is stable. However, it is different from the vanadium-titanium magnetite in Panxi area of ​​my country. >58%), TiO 2 High content (TiO 2 >12%), low silicon (SiO 2 Accounting for about 0.7%), its spheroidization and water absorption are poor, so it is not easy to sinter, and brittle perovskite is formed during the sintering process, and the sintered ferrite has less low-temperature bonding phase and its shape is similar to that of ordinary Calcium ferrite in sinter is different, resulting in poor sinter strength and low yield, which restricts the improvement of blast furnace smelting strength
[0004] Therefore, in the current preparation of vanadium-titanium sinter, Haisha vanadium-titanium iron ore concentrate is only used as an iron-containing auxiliary material to increase some elements (such as vanadium) in ordinary iron ore. Raw material cost of sinter remains high

Method used

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Examples

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preparation example Construction

[0011] The invention provides a method for preparing vanadium-titanium sintered ore. The method comprises: mixing a sintering raw material composition with water to prepare a sintering mixture, and then distributing, pressing and sintering the sintering mixture; wherein, The sintering raw material composition contains sea-sand vanadium-titanium iron ore concentrate, low-grade common iron ore concentrate, flux, fuel and optional steel slag; the content of TFe in the sea-sand vanadium-titanium-iron concentrate is above 58% by weight, TiO 2 The content is 12-14% by weight, SiO 2 The content of TFe is below 1.0% by weight; the content of TFe in the low-grade common iron ore is 47-49% by weight, TiO 2 The content of SiO is below 1.0 wt%. 2 The content is 12-17% by weight; based on the total weight of the sintered raw material composition, the content of the sea sand vanadium-titanium iron ore concentrate is 65-70% by weight, preferably 65-68% by weight; the The content of low-gr...

Embodiment approach

[0024] According to a preferred embodiment of the present invention, the preparation of the sinter mixture is carried out in the presence of returned ore, that is, the return ore and the sinter raw material composition are mixed together to prepare the sinter mixture, in this case , the particle size of the returned ore can usually be below 6.3mm. The addition of the returned ore can further improve the air permeability of the sintering mixture, increase the amount of sintering liquid phase, and improve the strength of the sintering ore.

[0025] In the present invention, relative to 100 parts by weight of the sintered raw material composition, the amount of the returned ore may be 20-30 parts by weight.

[0026] According to the preparation method of the present invention, the process of preparing the sintered mixture may include: first blending and second blending and granulation. Generally, the mixing method includes mixing the sintered raw material composition with water ...

Embodiment 1-5

[0048] Examples 1-5 are used to illustrate the vanadium-titanium sintered ore of the present invention and its preparation method.

[0049] Mix sea sand vanadium-titanium iron concentrate, low-grade common iron concentrate, quicklime, limestone, steel slag, coke powder, and returned ore according to the ratio shown in Table 1, then add to the mixing bin and mix in the mixer for 6-8min (Including first mixing and second mixing to make balls), to obtain a sintered mixture, the sintered mixture whose particle size is greater than 3mm accounts for more than 65% by weight.

[0050] First spread the base material in the sintering cup (300mm in diameter and 800mm in height), then put the above-mentioned sintering mixture into the sintering cup for cloth and pressing, and press the material so that the material layer is pressed down by 30mm. Then the sintering cup is ignited and ventilated for sintering. By controlling the ignition temperature to 1100°C-1150°C, the ignition time to 2....

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Abstract

The invention relates to the field of blast furnace smelting and discloses vanadium-titanium sinter and its preparation method. The method comprises the following steps: mixing sintering raw material compositions with water to prepare a sinter mixture, and distributing, pressing and sintering the sinter mixture. With the total weight of the sintering raw material compositions as the reference, content of sea sand vanadium-titanium-iron concentrate is 65-70 wt%, and content of low-grade common iron ore is 10-15 wt%. By the above method, high proportion of sea sand vanadium-titanium-iron concentrate can be sintered; finished product ratio of vanadium-titanium sinter can reach more than 74%; comprehensive tumbler strength (ISO) reaches more than 73%; TFe grade is greater than or equal to 50%; and productivity of a sintering machine reaches more than 1.15t / (m<2>.h). The vanadium-titanium sinter has high mechanical strength and can be used for blast furnace smelting.

Description

technical field [0001] The invention relates to a method for preparing vanadium-titanium sintered ore and vanadium-titanium sintered ore prepared by the method. Background technique [0002] The sinter for blast furnace smelting is currently prepared from non-sea sand full vanadium ilmenite concentrate and different proportions of ordinary iron concentrate (for example, 70% of non-sea sand full vanadium ilmenite concentrate plus 30% of ordinary iron concentrate powder) Or all of them are made by sintering ordinary iron concentrate. Such sintering is widely used because of its simple sintering process. However, due to the dwindling of common iron ore resources and the continuous rise in cost, the raw material cost of sintered ore is increasingly dependent on the market. [0003] The sea sand vanadium-titanium iron concentrate reserves in Indonesia and surrounding areas are very rich, and the price is low and the source is stable. However, it is different from the vanadium-ti...

Claims

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Application Information

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IPC IPC(8): C22B1/16
Inventor 胡鹏付卫国饶家庭唐文博谢洪恩王禹键蒋胜
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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