CN104773714A

CN104773714A - Method for continuously producing manganese nitride product

Info

Publication number: CN104773714A
Application number: CN201510170143.1A
Authority: CN
Inventors: 王海娟; 杨景军; 贾强
Original assignee: Sinosteel Jilin Electro-Mechanical Equipment Co Ltd
Current assignee: Sinosteel Jilin Electro-Mechanical Equipment Co Ltd
Priority date: 2015-04-13
Filing date: 2015-04-13
Publication date: 2015-07-15

Abstract

The invention relates to a method for continuously producing a manganese nitride product, which is characterized by comprising the following steps: 1) crushing at least one of electrolytic manganese sheet, manganese metal and manganese iron, proportionally adding an adhesive, and pressing into balls; 2) enhancing the temperature and pressure of a pusher kiln or tunnel kiln, wherein the following conditions are always kept: the pressure is positive at 100-10000Pa, and the pusher kiln or tunnel kiln has high temperature at the inlet end and low temperature at the outlet end; 3) putting the material prepared in the step 1) into the pusher kiln or tunnel kiln while introducing nitrogen or an ammonia-nitrogen gas mixture into the pusher kiln or tunnel kiln for 2-8 hours; and 4) discharging the material prepared in the step 3) out of the kiln, and cooling in a nitrogen protective atmosphere.

Description

A kind of method of continuous prodution nitrogenized manganese product

Technical field

The invention belongs to ferroalloy smelting field, relate to a kind of production technique of iron alloy nitrogenize, is a kind of method of continuous prodution nitrogenized manganese product.

Background technology

In Iron And Steel Industry, manganese be occupy iron after the important metallic element of second, almost the manganese of more than 90% is consumed in Iron And Steel Industry, has " without manganese not Cheng Gang " to say.Manganese adds separately fashionable, is very easily oxidized, and nitrogen not easily adds because density is minimum, often need add when smelting some alloy simultaneously, and nitrogenized manganese is not only beneficial to molten steel and absorbs, and also makes manganese, the utilization ratio of nitrogen element uprises.In recent years, people more go deep into the knowledge and utility of nitro-alloy and popularize, and all apply nitrogenized manganese, particularly abroad at many steel grades such as structure iron, stainless steel, high temperature steel, the consumption of nitrogenized manganese increases year by year, and the nitrogenized manganese of China is produced product major part and is used for outlet.Therefore the research and development of nitrogenized manganese alloy certainly has practical significance.

Domestic technically also very backward in nitrogenized manganese alloy production at present, there are problems, nitrogenizing reaction carries out in sealed furnace, can not continuous prodution, material causes furnace temperature uneven without motion, nitridation time is long, nitriding temperature system is unreasonable, product nitrogen content is low, composition tolerances is large, and production cost is high, cannot meet export requirement.

Summary of the invention

Technical problem to be solved by this invention is: the shortcoming overcoming prior art, provides a kind of method of continuous prodution nitrogenized manganese product.

The scheme of technical solution problem of the present invention is: a kind of method of continuous prodution nitrogenized manganese product, is characterized in that: comprise the following steps:

1), after at least one of electrolytic manganese sheet, manganese metal and ferromanganese being crushed to 40 ~ 200 orders, add with the ratio of 3 ~ 5 wt% the ball-type that binding agent is pressed into Φ 3 ~ 5cm;

2) pushed bat kiln or tunnel furnace are carried out increasing temperature and pressure, temperature range is 800 ~ 1000 DEG C, and remains the malleation of 100 ~ 10000Pa, pushed bat kiln or tunnel furnace entrance end temperature is high, discharge-end temperature is low;

3) be placed in pushed bat kiln or tunnel furnace by the material that step 1) is obtained, in pushed bat kiln or tunnel furnace, pass into nitrogen or ammonia nitrogen gas mixture, the flow of nitrogen or ammonia nitrogen gas mixture meets the malleation of 100 ~ 10000Pa in kiln, passes into time 2 ~ 8h simultaneously;

4) by the material kiln discharge that step 3) is obtained, 100 DEG C ~ 150 DEG C are cooled under nitrogen protection.

Described binding agent is water glass.

The existing technology of method of a kind of continuous prodution nitrogenized manganese product of the present invention is compared, and has the following advantages:

1) energy continuous prodution, cancels the temperature-rise period in single stove production process and temperature-fall period, and make full use of manganese and nitrogen reaction liberated heat, energy consumption is low, and production efficiency is high, and the production time shortens greatly, significantly reduces production cost;

2} adopts normal pressure nitrogenize, and without the need to vacuumizing, without the need to high pressure resistant, facility investment is little, significantly reduces cost of investment;

3) the dissolution equilibrium relation in manganese according to manganese nitrogen phasor and nitrogen, known at 700 DEG C within the scope of 1100 DEG C, the saturation solubility of nitrogen in manganese increases along with the reduction of temperature.But when temperature is lower than 750 DEG C, electrolytic manganese not nitrogenize substantially; When nitriding temperature is about 800 DEG C, the slow nitrogenize of electrolytic manganese; When nitriding temperature is higher than 900 DEG C, electrolytic manganese nitrogenization speed is very fast.Therefore, the temperature range in pushed bat kiln or tunnel furnace is 800 ~ 1000 DEG C, and entrance end temperature is higher, and outlet block temperature is lower.The nitrogen content that nitridation time can improve again nitrogenized manganese product can be shortened.

Embodiment

Below in conjunction with embodiment, the present invention is further described.

Embodiment 1, step is as follows:

1), after 1 ton of electrolytic manganese sheet being crushed to 40 orders, the ball-type of water glass compacting Φ 3cm is added with the ratio of 3 wt%;

2) pushed bat kiln or tunnel furnace are carried out increasing temperature and pressure, temperature range is 800 DEG C, and remains the malleation of 100Pa, pushed bat kiln or tunnel furnace entrance end temperature is high, discharge-end temperature is low;

3) be placed in pushed bat kiln or tunnel furnace by the material that step 1) is obtained, in pushed bat kiln or tunnel furnace, pass into nitrogen or ammonia nitrogen gas mixture, the flow of nitrogen or ammonia nitrogen gas mixture meets the malleation of 100Pa in kiln, passes into time 2h simultaneously;

4) by the material kiln discharge of step 3), be cooled to 100 DEG C under nitrogen protection, it is 7.5wt% that the nitrogenized manganese ball product of acquisition records nitrogen content through Beijing Non-Ferrous Metal Research General Academy's country's non-ferrous metal and electronic material Institute of Analysis.

Embodiment 2, step is as follows:

1), after 1 ton of electrolytic manganese sheet being crushed to 120 orders, the ball-type of water glass compacting Φ 4cm is added with the ratio of 4wt%;

2) pushed bat kiln or tunnel furnace are carried out increasing temperature and pressure, temperature range is 900 DEG C, and remains the malleation of 550Pa, pushed bat kiln or tunnel furnace entrance end temperature is high, discharge-end temperature is low;

3) material obtained for step 1) is placed in pushed bat kiln or tunnel furnace, in pushed bat kiln or tunnel furnace, passes into nitrogen or ammonia nitrogen gas mixture simultaneously, the flow of nitrogen or ammonia nitrogen gas mixture be meet 550Pa in kiln malleation, pass into time 5h;

4) by the material kiln discharge of step 3), be cooled to 125 DEG C under nitrogen protection, it is 7.2wt% that the nitrogenized manganese ball product of acquisition records nitrogen content through Beijing Non-Ferrous Metal Research General Academy's country's non-ferrous metal and electronic material Institute of Analysis.

Embodiment 3, step is as follows:

1), after 1 ton of electrolytic manganese sheet being crushed to 200 orders, the ball-type of water glass compacting Φ 5cm is added with the ratio of 5wt%;

2) pushed bat kiln or tunnel furnace are carried out increasing temperature and pressure, temperature range is 1000 DEG C, and remains the malleation of 1000Pa, pushed bat kiln or tunnel furnace entrance end temperature is high, discharge-end temperature is low;

3) be placed in pushed bat kiln or tunnel furnace by the material that step 1) is obtained, in pushed bat kiln or tunnel furnace, pass into nitrogen or ammonia nitrogen gas mixture, the flow of nitrogen or ammonia nitrogen gas mixture meets the malleation of 1000Pa in kiln, passes into time 8h simultaneously;

4) by the material kiln discharge of step 3), be cooled to 150 DEG C under nitrogen protection, it is 7.3wt% that the nitrogenized manganese ball product of acquisition records nitrogen content through Beijing Non-Ferrous Metal Research General Academy's country's non-ferrous metal and electronic material Institute of Analysis.

Claims

1. a method for continuous prodution nitrogenized manganese product, is characterized in that: comprise the following steps:

2. the method for a kind of continuous prodution nitrogenized manganese product as claimed in claim 1, is characterized in that: described binding agent is water glass.