CN102910597A

CN102910597A - Method for increasing nitriding quantity of manganese nitride in nitride smelting process

Info

Publication number: CN102910597A
Application number: CN201210426908XA
Authority: CN
Inventors: 齐牧; 崔传海; 李广明; 刘飞; 吴文鹏; 崔玉杰; 任芝灏
Original assignee: CITIC Jinzhou Metal Co Ltd
Current assignee: CITIC Jinzhou Metal Co Ltd
Priority date: 2012-10-31
Filing date: 2012-10-31
Publication date: 2013-02-06

Abstract

The invention discloses a method for increasing nitriding quantity of manganese nitride in a nitride smelting process, and the method comprises the steps that a resistance heating furnace is adopted, a furnace pipe of the resistance heating furnace is connected with a furnace body of the resistance heating furnace by flanges, vacuum rubber gaskets are arranged at flange joints to seal the flange joints between the furnace pipe and the furnace body, manganese metal is filled in the furnace pipe to seal the furnace pipe, nitrogen is filled to the furnace pipe, pressure is boosted, when the pressure in the furnace pipe reaches 0.15MPa-0.2MPa, the nitrogen is filled to a gap between the furnace pipe and the furnace body, the pressure in the furnace pipe is boosted to 0.01MPa-0.06MPa, meanwhile, the nitrogen gas is continuously filled to the furnace pipe to increase the pressure in the furnace pipe to 0.2MPa-0.3MPa, and the manganese nitride is smelted. The method has the advantages that as the flange joints between the furnace pipe and the furnace body are sealed, and the nitrogen is filled into the gap between the furnace pipe and the furnace body to boost the pressure, the furnace pipe can bear higher pressure; and the nitrogen content of the manganese nitride is increased by increasing the pressure in the furnace pipe, so that the quality grade of products is raised.

Description

Improve the method for nitrogenized manganese nitriding amount in a kind of nitride smelting process

Technical field

The invention belongs to the nitride field of smelting, particularly improve the method for nitrogenized manganese nitriding amount in a kind of nitride smelting process.

Background technology

When alloy smelting, in order to put forward heavy alloyed intensity, toughness and erosion resistance, need to add manganese and two kinds of elements of nitrogen, but because the solubleness of nitrogen in alloy is low, proportion is little, be difficult for adding; And when adding manganese separately, manganese is easily oxidized, and utilization ratio is low.Therefore, add with the form of nitrogenized manganese, improved greatly the utilization ratio of nitrogen, manganese.

At present, the method that industry prepares nitrogenized manganese is first manganese metal to be made powder, then with its compression moulding, pack in the resistance heading furnace that is formed by flue and body of heater, heat up, nitriding under specified temperature, manganese metal at high temperature with nitrogen generation nitrogenize thermopositive reaction, when generating nitride, carry out solid state sintering.The problem that this method exists is: because the flue internal pressure is easily blown drum after surpassing 0.2MPa, nitrogen content is limited in the flue, and nitriding efficient is not high, and the nitrogenous grade of product is low.

Summary of the invention

The technical problem to be solved in the present invention provides the method that improves nitrogenized manganese nitriding amount in a kind of nitride smelting process, to improve nitriding efficient, improves the quality of nitrogenized manganese product.

Technical solution of the present invention is:

Improve the method for nitrogenized manganese nitriding amount in a kind of nitride smelting process, its concrete steps are:

1) adopts resistance heading furnace, with connecting by flange between the flue of resistance heading furnace and the body of heater, establish the vacuum rubber pad at the flange connections pad, the flange connections of flue and body of heater is sealed;

2) in flue, load the manganese metal, flue is sealed;

3) pass into nitrogen in flue, pressurization when the flue internal pressure reaches 0.15MPa～0.2MPa, passes into nitrogen in the space between flue and the body of heater, be pressurized to 0.01MPa～0.06MPa;

4) continue in flue, to pass into nitrogen when being filled with nitrogen in the space between flue and body of heater, promote the flue internal pressure to 0.2MPa～0.3 MPa, carry out nitrogenized manganese and smelt.

The invention has the beneficial effects as follows: seal by the junction to flue and body of heater, and the space between flue and the body of heater is passed into the nitrogen pressurization, can bear larger pressure thereby make in the flue, avoid the flue internal pressure easily to be blown drum above behind the pressure that can bear; By increasing the flue internal pressure, improve the nitrogen content of nitrogenized manganese, thereby improve the quality grade that nitride is smelted rear finished product, nitrogen content is 8%～10% in the nitrogenized manganese product, improves about 3% than former method.

Description of drawings

Fig. 1 is the structural representation that nitrogenized manganese is smelted the resistance heading furnace that uses.

Among the figure: flue 1, flue flange 101, body of heater 2, process furnace flange 201, vacuum rubber pad 3, bell 4, nitrogen are filled with mouthful I 5, and nitrogen is filled with mouthful II 6.

Embodiment

Embodiment 1

As shown in Figure 1, adopt resistance heading furnace, with being connected connection with the body of heater flange by flue flange 101 between flue 1 and the body of heater 2, establish vacuum rubber pad 3 at the flange connections pad, flue 1 and the flange connections of body of heater 2 are sealed, make between flue 1 and the resistance heading furnace 2 and form sealed structure.Be provided with bell 4 at flue 1, described bell 4 is provided with nitrogen and is filled with mouthful I 5, is provided with nitrogen at flue flange 101 and body of heater flange 201 and is filled with mouthful II 6, and described nitrogen is filled with mouthful II 6 and communicates with space between body of heater 2 and the flue 1.

Open bell 4, to flue 1 interior filling manganese metal, build bell 4 with flue 1 sealing; Be filled with mouthful I 5 by nitrogen and pass into nitrogen to flue 1 pressurization, when flue 1 internal pressure reaches 0.15MPa, be filled with mouthful II 6 by nitrogen and in the space between flue 1 and the body of heater 2, pass into nitrogen, be pressurized to 0.01MPa; Be filled with mouthful I 5 by nitrogen when being filled with nitrogen in the space between flue 1 and body of heater 2 and continue in flue 1, to pass into nitrogen, promote flue 1 internal pressure to 0.20MPa, under 900 ℃～1000 ℃, smelt 24h, get nitrogenized manganese; After testing, the nitrogen content in the nitrogenized manganese product is 8.0%.

Embodiment 2

Open bell 4, to flue 1 interior filling manganese metal, build bell 4 with flue 1 sealing; Be filled with mouthful I 5 by nitrogen and pass into nitrogen to flue 1 pressurization, when flue 1 internal pressure reaches 0.18MPa, be filled with mouthful II 6 by nitrogen and in the space between flue 1 and the body of heater 2, pass into nitrogen, be pressurized to 0.03MPa; Be filled with mouthful I 5 by nitrogen when being filled with nitrogen in the space between flue 1 and body of heater 2 and continue in flue 1, to pass into nitrogen, promote flue 1 internal pressure to 0.23MPa, under 900 ℃～1000 ℃, smelt 24h, get nitrogenized manganese; After testing, the nitrogen content in the nitrogenized manganese product is 9.0%.

Embodiment 3

As shown in Figure 1, adopt resistance heading furnace, with being connected connection with the body of heater flange by flue flange 101 between flue 1 and the body of heater 2, establish vacuum rubber pad 3 at the flange connections pad, flue 1 and the flange connections of body of heater 2 are sealed, make between flue 1 and the body of heater 2 and form sealed structure.Be provided with bell 4 at flue 1, described bell 4 is provided with nitrogen and is filled with mouthful I 5, is provided with nitrogen at flue flange 101 and body of heater flange 201 and is filled with mouthful II 6, and described nitrogen is filled with mouthful II 6 and communicates with space between body of heater 2 and the flue 1.

Open bell 4, to flue 1 interior filling manganese metal, build bell 4 with flue 1 sealing; Be filled with mouthful I 5 by nitrogen and pass into nitrogen to flue 1 pressurization, when flue 1 internal pressure reaches 0.2MPa, be filled with mouthful II 6 by nitrogen and in the space between flue 1 and the body of heater 2, pass into nitrogen, be pressurized to 0.06MPa; Continue when being filled with nitrogen in the space between flue 1 and body of heater 2 in flue 1, to pass into nitrogen, promote flue 1 internal pressure to 0.30MPa, under 900 ℃～1000 ℃, smelt 24h, get nitrogenized manganese; After testing, the nitrogen content in the nitrogenized manganese product is 10.0%.

Claims

1. improve the method for nitrogenized manganese nitriding amount in the nitride smelting process, it is characterized in that concrete steps are as follows:

1.1, adopt resistance heading furnace, with connecting by flange between the flue of resistance heading furnace and the body of heater, establish the vacuum rubber pad at the flange connections pad, the flange connections of flue and body of heater is sealed;

1.2, load the manganese metal in the flue, flue is sealed;

1.3, in flue, pass into nitrogen, pressurization when the flue internal pressure reaches 0.15MPa～0.2MPa, passes into nitrogen in the space between flue and the body of heater, be pressurized to 0.01MPa～0.06MPa;

1.4, continue in flue, to pass into nitrogen when being filled with nitrogen in the space between flue and body of heater, promote the flue internal pressure to 0.2MPa～0.3 MPa, carry out nitrogenized manganese and smelt.