Method for preparing silicon nitride ferrovanadium

A technology of silicon vanadium nitride and silicon vanadium nitride, which is applied in the field of ferroalloys, can solve the problems of insufficient stability and precision, and achieve the effects of short alloying time, improved composition uniformity, and improved economic benefits

Inactive Publication Date: 2018-01-19
HEBEI IRON AND STEEL
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Problems solved by technology

[0009] In view of the problems existing in the prior art, the present invention provides a method for preparing silicon vanadium nitride ferro-vanadium, through the adjustment of raw materials, the carbonization reaction and nitriding reaction carried out in sequence are used to obtain silicon vanadium ferro-vanadium nitride, which solves the problem There are problems of insufficient stability and precision in the preparation of ferrosilicon nitride, which greatly improves the composition uniformity of ferrosilicon nitride, reduces energy consumption, and obtains products with excellent performance

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  • Method for preparing silicon nitride ferrovanadium

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Experimental program
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Effect test

Embodiment 1

[0036] (1) Weigh 403g of vanadium trioxide, 105g of carbon powder, 215g of ferrosilicon, and 410g of iron powder, and grind them respectively until the particle size is between 100-200 μm; put the above materials into a mixer and mix them for 30 minutes, and mix them evenly Four parts of materials are weighed from the powder, each part is 40g, and the small parts of materials are put into a cake press machine to be pressed into blocks, and the pressure is 35MPa;

[0037] (2) Put the lumpy material into the pusher kiln, with 300m 3 Nitrogen was introduced at a rate of / h, heated to 850°C for carbonization reaction, and after 6 hours of reaction, the temperature was raised to 1200°C for nitriding reaction. After 19 hours of heat preservation, the reaction was completed to obtain ferrosilicon vanadium nitride.

[0038] After detection, the V content in the obtained ferrosilicon nitride is 30%, the N content is 15%, and the Si content is 10%.

Embodiment 2

[0040](1) Weigh 403g of vanadium trioxide, 115g of carbon powder, 215g of ferrosilicon, and 410g of iron powder, and grind them respectively until the particle size is between 100-200 μm; put the above materials into a mixer and mix them for 30 minutes, and then mix them Four parts of materials are weighed from the powder, each part is 40g, and the small parts of materials are put into a cake press machine to be pressed into blocks, and the pressure is 30MPa;

[0041] (2) Put the lumpy material into the pusher kiln, with 280m 3 Nitrogen was introduced at a rate of / h, heated to 900°C for carbonization reaction, and after 7 hours of reaction, the temperature was raised to 1250°C for nitriding reaction. After 20 hours of heat preservation, the reaction was completed to obtain ferrosilicon vanadium nitride.

[0042] After testing, the V content in the obtained ferrosilicon nitride is 40%, the N content is 17%, and the Si content is 13%.

Embodiment 3

[0044] (1) Weigh 403g of vanadium trioxide, 134g of carbon powder, 215g of ferrosilicon, and 410g of iron powder, and grind them respectively until the particle size is between 100-200 μm; put the above materials into a mixer for mixing for 30 minutes, and mix them Four parts of materials are weighed from the powder, each part is 40g, and a small part of the materials is put into a cake press machine to be pressed into blocks, and the pressure is 28MPa;

[0045] (2) Put the lumpy material into the pusher kiln, with 250m 3 Nitrogen gas was introduced at a rate of 1 / h, and heated to 800°C for carbonization reaction. After 5 hours of reaction, the temperature was raised to 1300°C for nitriding reaction. After 20 hours of heat preservation, the reaction was completed to obtain ferrosilicon vanadium nitride.

[0046] After detection, the V content in the obtained ferrosilicon nitride is 38%, the N content is 14%, and the Si content is 12%.

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Abstract

The invention relates to a method for preparing silicon nitride ferrovanadium. The method comprises the steps that vanadium trioxide, carbon powder, silicon iron and iron powder are mixed and then pressed into blocky materials; and in the nitrogen atmosphere, the obtained blocky materials are heated to be subjected to the carburizing reaction, then, the temperature is increased, the nitriding reaction is conducted, and the silicon nitride ferrovanadium is obtained. According to the method, the raw materials are adjusted, the carburizing reaction and the nitriding reaction which are sequentially conducted are utilized for preparing the silicon nitride ferrovanadium. Compared with a traditional technology, the prepared silicon nitride ferrovanadium is higher in proportion, and stability andaccuracy of vanadium can be better controlled; and meanwhile, component uniformity of silicon nitride ferrovanadium products is improved, energy consumption is reduced, and the economic benefits of enterprises are increased. According to the method, the technology process is simple, adopted equipment is common, the alloying time is shorter, and good application prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of iron alloys, in particular to a method for preparing ferro-vanadium silicon nitride. Background technique [0002] Nitrogen is a very beneficial element in vanadium-containing microalloy steel. Adding nitrogen in the steel can strengthen the precipitation of vanadium, change the interphase distribution of vanadium, improve the durable strength of the steel, improve the toughness and plasticity of the steel, and also increase the heat resistance. and creep capacity. Due to the excellent comprehensive strengthening effect of vanadium and nitrogen, and can effectively save vanadium resources, it has become one of the main microalloying technologies used in my country. [0003] At present, the methods of nitriding in steel mainly include adding vanadium nitride, nitrogen-enriched ferromanganese, etc. These methods have problems such as expensive, low yield, instability, and high production cost. Using sili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/16C22C1/05C22C1/10C22C35/00
Inventor 董自慧吴春亮李九江李兰杰王娜张苏新
Owner HEBEI IRON AND STEEL
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