Efficient vanadium-nitrogen alloy production process

Abstract

The invention discloses an efficient vanadium-nitrogen alloy production process which comprises the following steps: performing nitrogen atomization mixing primary reduction on carbon agent powder and molten-state V2O5, further performing carbon thermal reduction and nitridation to obtain vanadium-nitrogen alloy powder, cooling, adding iron powder, mixing, pressing and molding, and sintering and nitriding to obtain a vanadium-nitrogen alloy finished product. The method is good in product quality, high and stable in vanadium and nitrogen content, low in production cost, low in energy and material consumption and small in equipment occupied area.

Description

technical field [0001] The invention relates to the field of additive production in iron and steel metallurgy, in particular to the production technology of vanadium nitrogen alloy. Background technique [0002] In the industrialized large-scale production of existing vanadium-nitrogen alloys, the oxides of vanadium are used 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 general reaction formula for forming vanadium nitrogen alloy is. [0008] V 2 o 5 ( s) + 4C( s) + N 2 (g) = 2VN(s) + CO 2 ( g) ...

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Problems solved by technology

[0020] (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 25 days for the furnace to be shut down for heat preservation to repair the furnace body, and the time for laying the furnace and drying the furnace is at least 25 days.

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

[0021] (3) The product quality needs to be continuously improved. Generally, the national standard VN16 and below grades are produced, and the main content of vanadium and nitrogen is not controlled precisely and fluctuates greatly. For some customers, even if the product is higher than the lower limit of the national standard, it does not exceed much As for the contract terms of the corresponding over-converted amount, the vanadium is higher than the lower limit of the national standard, which is very uneconomical. Some manufacturers blend products with high vanadium content and batches of products with vanadium content that do not meet the national standard. It can be converted to meet the standard, but it is actually an unqualified product. When the delivery is sampled, it may fail to pass the test, resulting in the risk of deducting money or returning the product.

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