Method for producing manganese nitride

Abstract

The invention provides a preparation method of nitrogenized manganese. The nitrogenized manganese is prepared by continuously nitriding the material containing manganese in the atmosphere containing nitrogen and reducible hydrogen gas with 0.01 to 10 MPa absolute pressure through a nitriding reactor at 350 to 1200 DEG C, the nitrogen content in the obtained nitrogenized manganese is 3 to 25 percent, and the Mn element content is higher than 50 percent.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy and relates to a preparation method of manganese nitride. Background technique [0002] Manganese plays a role in deoxidation, desulfurization, reducing hot embrittlement caused by sulfur, and improving heat treatment performance of steel in the steelmaking process. As an alloying element, manganese can form a solid solution with iron, increasing the strength and hardness of steel. Manganese is second only to nickel in its ability to form and stabilize austenite in steel. Nitrogen is initially used as an austenite forming element to replace part of the expensive nickel and improve the performance of the material. As an alloying element, nitrogen can improve the strength, toughness, creep resistance and corrosion resistance of high nitrogen steel. Therefore, when smelting some grades of steel, it is often necessary to add manganese and nitrogen at the same time, but it is difficult to add...

AI Technical Summary

Problems solved by technology

[0008] The disadvantages of the above two patents are that solid materials and gases cannot continuously enter and exit the reactor, single furnace intermittent production, low heat efficiency and relatively low production efficiency

[0009] Hunan Ferroalloy Factory Cui Xianyun (Ferroalloy, 2001(1): 12~16) produced manganese nitride by the rotary method, which is to add a single batch of materials into a rotary reactor. During the production process, solid materials cannot be continuously fed in and out. Each production reaction All the furnaces have gone through the process of heating-insulating-cooling, which also has the disadvantage of batch production of a single furnace, that is, the thermal efficiency and production efficiency are low.

[0010] The method for preparing manganese nitride disclosed in Chinese patent CN1876870, Wu Qingding, etc. in Chinese patent CN1803585 (and published articles: Mechanical Engineering Materials, 2006, 30 (11): 33-35) is also a single furnace intermittent operation, and needs to be Before heating the material, vacuumize the reactor until the pressure is lower than several hundred Pa. CN1803585 adds water glass when the material is pressed into blocks, and CN1876870 uses manganese-silicon alloy as raw material. When manganese nitride is used as a steelmaking additive, it will inevitably affect the Si content of the steel

[0015] In summary, among the existing preparation methods, there is no one that has a wide range of substrates and can continuously prepare manganese nitride on a large scale.