Production method for micro-carbon nitrogen containing ferrochromium

Abstract

The invention discloses a production method for micro-carbon nitrogen containing ferrochromium. The production method includes the following steps that (1) micro-carbon ferrochromium blocks are crushed into fine particles with the granularity being smaller than or equal to 2 mm; (2) nitrogen with the purity being more than 99.99% is introduced into a microwave pushed slab kiln, oxygen in the kiln is exhausted, and the pressure in the kiln keeps at 100-100.1 KPa; (3) the fine particles are put into the microwave pushed slab kiln, microwave heating is carried out, the microwave nitridation reaction temperature is 950-1050 DEG C, the nitridation time is 1.5-2.5 h, the fine particles are melted and sintered for 1h at the high temperature of 1200-1350 DEG C after nitridation, then cooled to the temperature of 80 DEG C and finally discharged out of the kiln, and the micro-carbon nitrogen containing ferrochromium with the nitrogen content of 5.5-6.5% is obtained. The micro-carbon nitrogen containing ferrochromium prepared through the method is good in performance, high in nitrogen content and capable of being produced continuously, and realizes the purposes of low carbon and energy conservation.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal treatment, in particular to a production method of ferrochrome nitride. Background technique [0002] Ferrochromium nitride is widely used in electric furnace and oxygen converter to smelt nitrogen-containing steel. Nitrogen is an austenite forming element, which is added as a component of chromium manganese and chromium manganese nickel stainless steel to replace the shortage of nickel. At present, the production method of ferrochromium nitride is to feed ferrochromium products under certain conditions, and nitrogen gas is introduced into ferrochromium to carry out a compound reaction to obtain ferrochromium nitride. Specifically, there are two forms: liquid nitriding method and solid nitriding method. [0003] The production of ferrochromium nitride by liquid nitriding is carried out under high temperature conditions, and the nitrogen content of ferrochromium nitride produced by this m...

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Problems solved by technology

[0003] The production of ferrochromium nitride by liquid nitriding is carried out under high temperature conditions, and the nitrogen content of ferrochromium nitride produced by this method is very low: the nitrogen content is less than 2.0%, which is far lower than the national standard GB5685-85 According to the requirement that the N content of Class A products in ferrochromium nitride is not less than 3.0%, the ferrochromium nitride produced by the liquid nitriding method has no commercial value; while the nitriding ferrochromium nitride obtained by the solid nitriding method Ferrochromium, its surface physical state is poor, and some free nitrogen is adsorbed in the product, which makes the nitrogen content in the laboratory test incorrect, and it is easy to cause burning loss in the high-temperature smelting of special steel

[0004] Because the above-mentioned production method is not perfect, the production cost is high, the cycle is long, the energy consumption is large, and the efficiency is low. Therefore, the production of ferrochrome nitride by a new production process is a problem that metallurgical production enterprises pay attention to.