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Production method for nitrided ferrochromium

A production method, ferrochromium nitride technology, applied in the field of ferroalloy, can solve problems such as oxidation, uneven heating of materials, slow heating, etc., and achieve the effects of increasing nitrogen content, stable product quality, nitriding and low sintering temperature

Inactive Publication Date: 2014-12-24
江苏鼎跃金属制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: To provide a production method of ferrochromium nitride, which overcomes the defects of slow heating, uneven heating of materials, and prone to oxidation, and achieves the effects of high efficiency, energy saving, stable product quality, and high nitrogen content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Break the massive micro-carbon ferrochromium material into fine particles with a particle size ≤ 2mm, put it in a pure silicon carbide sagger with a size of 160mm*160mm*40mm, and then place the loaded sagger on the push plate Put 2 layers on each push plate, a total of 8 saggers, and then push the push plate into the microwave push plate kiln with a total microwave power of 72kw. The single microwave emission power is 1.2kw, and the materials are in the microwave push plate kiln After nitriding at 1000°C, melting and sintering at 1200°C, and finally cooling to about 60°C, the resulting material is a block-shaped ferrochromium nitride product. After testing, its nitrogen content is 6.2%.

Embodiment 2

[0041]Example 2: Break the massive micro-carbon ferrochromium material into fine particles with a particle size of ≤2mm, put it in a pure silicon carbide sagger with a size of 50mm*50mm*50mm, and then place the loaded sagger on the push plate On the top, each push plate is placed in 2 layers, a total of 9 saggers, and then the push plate is pushed into the microwave push plate kiln with a total microwave power of 120kw. The single microwave emission power is 1.5kw, and the materials are in the microwave push plate kiln After nitriding at 900°C, melting and sintering at 1300°C, and finally cooling to 100°C, the resulting material is a block-shaped ferrochromium nitride product, and its nitrogen content is 5.5% after testing.

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Abstract

The invention discloses a production method for nitrided ferrochromium. The method comprises the steps as follows: (1) lump extra-low-carbon ferrochromium is crushed into fine particles with the particle size small than or equal to 2 mm; (2) nitrogen with the purity higher than 99.999% is introduced into a microwave pushed slab kiln, oxygen in the kiln is exhausted until the oxygen content in the kiln is lower than 100 ppm, and the air pressure in the kiln is kept at 100 KPa-100.1 KPa; (3) crushed raw materials are placed in a mullite sagger containing 5%-80% of silicon carbide, a pure silicon carbide sagger or a silicon carbide and silicon nitride combined sagger; and (4) the materials are preheated, nitrided, melted, sintered, cooled and discharged sequentially in the microwave pushed slab kiln. According to the production method, the nitriding and sintering temperature is low, the product quality is stable, and the nitrogen content is high; the industrial microwave pushed slab kiln has high degree of automation, can perform continuous production and has low operation and maintenance cost; the producing cycle is remarkably shortened by more than 30%; and energy conservation and emission reduction are achieved, and the production environment is clean.

Description

technical field [0001] The invention belongs to the field of ferroalloy technology, in particular to a production method for smelting special steel and micro-alloyed ferrochromium nitride. Background technique [0002] At present, the production method of ferrochromium nitride is mainly based on the traditional high temperature, vacuum, and long-time nitriding sintering process, mainly including electric furnace method, vacuum resistance furnace method, and vacuum intermediate frequency furnace method. The materials are mainly heated by thermal radiation or convection. Slow heating, uneven heating of materials, long production cycle, high energy consumption, non-continuous production, daily loss of equipment and high maintenance costs and other defects. [0003] The existing microwave heating technology, because microwave heating has the characteristics of penetrating, rapid and selective heating, can reduce the reaction temperature and shorten the reaction time, thereby gre...

Claims

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Application Information

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IPC IPC(8): C22C33/06C22C35/00
Inventor 赵兴桥张晓东常春华韦东才张跃兵毛继和杨军王玺陈斌王雄
Owner 江苏鼎跃金属制品有限公司
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