High-chromium type vanadium-titanium magnetic pellets and method for improving quality of high-chromium type vanadium-titanium magnetic pellets

A vanadium-titanium-magnetite concentrate and vanadium-titanium-magnetite technology are applied in the field of metallurgy and can solve the problems of lack of application of pellets entering the furnace, poor quality and metallurgical properties of high-chromium-type vanadium-titanium magnetite pellets, etc.

Inactive Publication Date: 2017-09-29

PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP

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AI-Extracted Technical Summary

Problems solved by technology

[0004] High-chromium vanadium-titanium magnetite concentrate is a kind of vanadium-titanium magnetite with high chromium content. In the prior art, the quality and metallurgical propertie...

Method used

Provide a kind of method improving high-chromium type vanadium-titanium magnetite pellet quality, it comprises: at first, be 6~7% high-chromium type vanadium-titanium magnetite concentrate and binding agent by moisture mass percentage content according to The ratio of 98.4:1.5~1.7 is mixed and stirred to obtain a mixture. The high-chromium vanadium-titanium magnetite concentrate with a moisture content of 6-7% has small moisture fluctuations, and it is mixed with the binder at a ratio of 98.4:1.5-1.7. The binder has a strong bonding ability. It can improve the bonding condition between material particles and play the role of molecular transfer between particles. Moreover, the mechanical strength of the green balls is affected by the bonding performance, so that the mechanical strength of the green balls is increased, thereby preparing high-quality pellets. Secondly, the mixed material is pelletized, and the moisture content of the green pellets after pelletizing is 9-10%. Because water has a great influence on ball formation, when raw materials with insufficient water are made into pellets, it is difficult for the raw balls to grow up. Green pellets with a water mass percentage of 9-10% are easy to form and grow up, and can reduce the formation of green pellets with a particle size of less than 8mm, and help to improve the strength of green pellets. Then, the raw balls are screened and roasted in turn to obtain cooked balls. Firing is carried out in an oxidizing atmosphere. After sieving the green balls to obtain the appropriate raw material particle size, ensure that the raw material particles are closely arranged, and the average capillary space is small, so that the molecular cohesion will be enhanced. The strength of the green pellets also increases as the porosity of the balls decreases, resulting in higher quality pellets in the end. At the same time, the green balls are ro...

Abstract

The invention provides high-chromium type vanadium-titanium magnetic pellets and a method for improving the quality of the high-chromium type vanadium-titanium magnetic pellets and relates to the technical field of metallurgy. The high-chromium type vanadium-titanium magnetic pellets are prepared by the following steps that high-chromium type vanadium-titanium magnetic concentrates with the water content being 6%-7% in mass percent and binding agents are mixed and stirred according to the ratio of 98.4: 1.5-1.7, and a mixture is obtained; the mixture is pelletized, and the water content of each pelletized green pellet is made to be 9%-10% in mass percent; and the green pellets are screened and roasted sequentially, then roasted pellets are obtained, and roasting is conducted under the oxidizing atmosphere. The high-chromium type vanadium-titanium magnetic pellets obtained by the method for improving the quality of the high-chromium type vanadium-titanium magnetic pellets are excellent in metallurgical performance and high in quality, the requirement of medium-small blast furnaces for the in-furnace pellets can be met, and the requirement of extra-large blast furnaces for the in-furnace pellets is further met, and the high-chromium type vanadium-titanium magnetic pellets have wide industrial production prospects.

Technology Topic

Water contentChromium +6

Image

Examples

Experimental program(6)

Example Embodiment

[0046] Example 1

[0047] The present embodiment provides a method for improving the quality of high-chromium-type vanadium-titanium-magnetite pellets, including:

[0048] Mixing and stirring the high-chromium vanadium-titanium-magnetite concentrate with a moisture mass percentage content of 6-7% and bentonite in a ratio of 98.4:1.5 to obtain a mixture;

[0049] Among them, the main components of the high-chromium vanadium-titanium-magnetite concentrate are:

[0050] Cr 2 O 3 : 0.8%, TFe: 50%, Ti: 11%, V: 0.5%.

[0051] The mixture is pelletized, and the moisture mass percentage content of the green pellets after pelletization is 9%;

[0052] Among them, the pelletizing is carried out in a disc pelletizing machine. The rotating speed of the disc pelletizing machine is controlled at 6r/min, and the inclination angle of the disc pelletizing machine is controlled at 48.5°.

[0053] The raw balls are sequentially screened and roasted to obtain cooked balls. After the green balls are screened, the green balls with a particle size of 10 mm are selected to enter the shaft furnace for roasting. And roasting is by introducing gas and air, and the temperature of the combustion chamber of the shaft furnace is controlled at 1050 ℃.

[0054] The main components of the high-chromium-type vanadium-titanium magnetite pellets prepared by the above-mentioned method are detected and calculated as:

[0055] Cr: 0.8%, TFe: 52%, TFeO: 0.5%, TiO 2 : 11%, V 2 O 5 : 0.5%. And the compressive strength of the high-chromium vanadium-titanium-magnetite pellets is 3000N.

Example Embodiment

[0056] Example 2

[0057] The present embodiment provides a method for improving the quality of high-chromium vanadium-titanium magnetite pellets. The difference between this method and the method provided in Example 1 is that it includes:

[0058] Mixing and stirring the high-chromium vanadium-titanium-magnetite concentrate with a moisture mass percentage content of 6.5% and bentonite in a ratio of 98.4:1.6 to obtain a mixture;

[0059] Among them, the main components of the high-chromium vanadium-titanium-magnetite concentrate are:

[0060] Cr 2 O 3 : 1.0%, TFe: 52%, Ti: 11.5%, V: 0.55%.

[0061] The mixture is pelletized, and the moisture mass percentage content of the green pellets after pelleting is 9.5%;

[0062] Among them, the pelletizing is carried out in a disc pelletizing machine. The rotating speed of the disc pelletizing machine is controlled at 7r/min, and the inclination angle of the disc pelletizing machine is controlled at 50°.

[0063] The raw balls are sequentially screened and roasted to obtain cooked balls. After the green balls are screened, the green balls with a particle size of 13 mm are selected to enter the shaft furnace for roasting. And roasting is by introducing gas and air, the combustion chamber temperature of the shaft furnace is controlled at 1070 ℃.

[0064] The main components of the high-chromium-type vanadium-titanium magnetite pellets prepared by the above-mentioned method are detected and calculated as:

[0065] Cr: 1.0%, TFe: 53%, TFeO: 0.7%, TiO 2 : 11.5%, V 2 O 5 : 0.55%. And the compressive strength of the high-chromium vanadium-titanium-magnetite pellets is 3500N.

Example Embodiment

[0066] Example 3

[0067] The present embodiment provides a method for improving the quality of high-chromium vanadium-titanium magnetite pellets. The difference between this method and the method provided in Example 1 is that it includes:

[0068] Mixing and stirring the high-chromium vanadium-titanium-magnetite concentrate with a moisture mass percentage content of 7% and bentonite in a ratio of 98.4:1.7 to obtain a mixture;

[0069] Among them, the main components of the high-chromium vanadium-titanium-magnetite concentrate are:

[0070] Cr 2 O 3 : 1.1%, TFe: 55%, Ti: 12%, V: 0.6%.

[0071] The mixture is pelletized, and the moisture mass percentage content of the green pellets after pelletization is 10%;

[0072] Among them, the pelletizing is carried out in a disc pelletizing machine. The rotating speed of the disc pelletizing machine is controlled at 8r/min, and the inclination angle of the pelletizing disc is controlled at 51.5°.

[0073] The raw balls are sequentially screened and roasted to obtain cooked balls. After the green balls are screened, the green balls with a particle size of 16 mm are selected to enter the shaft furnace for roasting. And roasting is by introducing gas and air, and the temperature of the combustion chamber of the shaft furnace is controlled at 1100 ℃.

[0074] The main components of the high-chromium-type vanadium-titanium magnetite pellets prepared by the above-mentioned method are detected and calculated as:

[0075] Cr: 1.1%, TFe: 54%, TFeO: 0.9%, TiO 2 : 12%, V 2 O 5 : 0.6%. And the compressive strength of the high-chromium vanadium-titanium-magnetite pellets is 4000N.

PUM

Property	Measurement	Unit
Compressive strength	3000.0	N
Compressive strength	3500.0	N
Compressive strength	4000.0	N

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