Efficient vanadium-nitrogen alloy production device

Abstract

The invention discloses an efficient vanadium-nitrogen alloy production device which mainly comprises a boiling nitriding furnace 1, a cyclone separator 2, a dust remover 3, an exhaust fan 4, a nitrogen mixing tank 5, a booster fan 6, an atomizer 7, a nitrogen tank 8, a cooler 15, a dry mixer 17, a sintering furnace 18, a pulverizer 19, a wet mixer 20 and a ball press 21. According to the device, V2O5 molten into liquid is subjected to atomization reduction carbonization and boiling nitridation to obtain vanadium-nitrogen alloy powder, after cooling, iron powder is added for mixing, then sintering, grinding, wet mixing compression molding and drying are conducted, and a finished vanadium-nitrogen alloy product is obtained. The method is good in product quality, high and stable in vanadium and nitrogen content, high in production efficiency, small in equipment occupied area and free of high-price and high-quantity lossy materials such as graphite charging buckets.

Description

technical field [0001] The invention relates to the field of additive production in iron and steel metallurgy, in particular to production facilities for vanadium nitrogen alloys. Background technique [0002] In the existing large-scale industrial production of vanadium-nitrogen alloys, the national standard VN16 grade is mainly produced, with vanadium oxides as raw materials, mainly V 2 o 5 As a raw material, it is obtained by carbothermal reduction nitriding, and the mainstream process of vanadium nitrogen alloy production is shown in the appendix figure 2 . [0003] Carbothermal reduction reaction and nitriding reaction occur in vertical kiln or pusher kiln, and the carbothermal reduction reaction formula is: [0004] V 2 o 5 ( s) + 6C( s) = 2VC( s) + CO 2 ( g) ↑+ 3CO( g) ↑ [0005] Nitriding reaction formula is: [0006] 2VC( s) + N 2 (g) = 2VN(s) + 2C [0007] The overall reaction formula of generating vanadium nitrogen alloy is: [0008] V 2 o 5 ( s) + ...

AI Technical Summary

Problems solved by technology

[0018] (2) It takes a long time to start and stop the furnace, and the equipment and components are easily damaged

It takes 15 days to start the furnace for drying and commissioning, and 7 days for the shutdown to cool down. It is inconvenient to start and stop the furnace

It takes at least 30 days to maintain the furnace body, build the furnace, and bake the furnace for at least 30 days. The annual maintenance cost is high, and the phenomenon of furnace shutdown caused by the arch plate occurs from time to time.

The reaction is carried out at high temperature, and the sliding wear of the graphite material tank in the kiln is serious; the silicon-molybdenum rod and silicon-carbon rod of the heating device are kept in a high-temperature environment for a long time, and the service life is short

[0019] (3) The product quality needs to be continuously improved. Generally, only the national standard VN16 and below grades can be produced. The main content of vanadium and nitrogen is not controlled precisely and fluctuates greatly. For some customers, even if the products are more than the lower limit of the national standard, there is no If the amount exceeds the contract terms, the amount will be converted accordingly. For vanadium that exceeds the lower limit of the national standard, it is very uneconomical. Some manufacturers mix products with high vanadium content and batches of products that do not meet the standard for vanadium content. It can be converted to meet the standard, but it is actually a substandard product. When the delivery is sampled, there will also be a risk of deduction or return due to unqualified testing.

Secondly, the carbon and oxygen content are relatively high, the carbon content is generally above 3.5%, and the oxygen content is above 1.5%. This makes the adjustment range of the main content of vanadium and nitrogen less, and it is not possible to add more iron powder to increase the density. Generally, only one ton of vanadium raw materials can be added. 4Kg~8Kg iron powder

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