Method for producing manganese nitride

A manganese nitride and nitrogen technology, applied in the field of iron and steel metallurgy, can solve the problems of intermittent production in a single furnace, affecting the Si content of steel, increasing equipment costs and operating costs, and achieving the effects of high thermal efficiency, stable process and stable product quality.

Inactive Publication Date: 2008-05-07
冯良荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Grind 3000kg of electrolytic manganese with a content greater than 99% through a 60-mesh sieve, add 30kg of biurea to each 100kg of manganese powder obtained, briquette, put into a graphite box of 340×340×150mm, and then put the graphite box on the push plate The kiln is propelled at a speed of 1.0m / h, the graphite box stays at a temperature above 1100°C for 13h, the gas is nitrogen, the pressure is normal pressure, and the flow rate is 80Nm 3 / h, gas and solid move in reverse, and the product is discharged after cooling below 100°C. The resulting solid was the resulting product with a composition of 79.7% Mn, 20.0% N. The lumpy product is formed by reducing the size of raw material briquettes, and there is no further agglomeration between the lumps, and the apparent density of the lumps is 3.95g / cm 3 .

Embodiment 2

[0038] 3000kg of MnO with a content greater than 99% 2Crushed through a 60-mesh sieve, then mixed evenly with 1000kg of melamine, and fed into the rotary kiln from the rotary kiln head at a rate of 50kg per hour. At the end of the kiln, the solid material stays in the kiln at a temperature above 450 ° C for 10 hours, the gas is ammonia, the pressure is 0.05 MPa absolute pressure, and the flow rate is 20 Nm 3 / h, gas and solid move in reverse, and the product is discharged after cooling below 100°C. The composition of the obtained product was 83.4% Mn, 15.1% N. The resulting product is powdery, and is compacted to an apparent density of 3.2g / cm 3 .

Embodiment 3

[0040] 3000kg of MnO with a content greater than 98% 2 Crushed through a 60-mesh sieve, the briquetting is formed, and the material is fed intermittently from the top of the shaft kiln of the resistance furnace at a rate of 150kg per hour, and the bottom of the shaft kiln is continuously discharged into an intermediate container sealed with the shaft kiln, and then from the middle The container is intermittently withdrawn from the shaft kiln sealing system. The mixed gas of nitrogen:hydrogen=3:1 enters continuously from the bottom of the vertical kiln, flows countercurrently with the solid, and withdraws from the top of the vertical kiln with a gas pressure of 0.4MPa. The solid material stays in the shaft kiln at a temperature above 900°C for 2 hours. The composition of the obtained product is 92.1% Mn, 5.8% N. The resulting bulk product has an apparent density of 3.2g / cm 3 .

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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...

Claims

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Application Information

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IPC IPC(8): C01B21/06C01G45/00
Inventor 冯良荣聂才淞
Owner 冯良荣
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