Process of producing iron alloy with low carbon and chromium

Abstract

The invention discloses a preparing craft of low-micro carbon chromium iron alloy, which comprises the following steps: 1) loading high carbon chromium iron into medium-frequency induction furnace; melting; heating-up at above 1600 deg.c; pouring into tank; 2) transferring the tank to station; air refining; 3) taking-up oxygen gun; inserting argon oxygen gun into solution liquid level 300-400mm of tank; setting the discharge of oxygen at 300-500 L / min; blowing at 5 min with argon oxygen ratio at 1 : 3; blowing at 5 min with argon oxygen ratio at 1 : 2; blowing at 5 min with argon oxygen ratio at 1 : 1; adding into silicon iron; 4) transferring the tank into vacuum chamber; switching in argon oxygen pipe at the bottom of tank; blowing into argon oxygen mixed gas; controlling the discharge capacity of argon gas at 150-250 L / min, discharge capacity of oxygen at 40-80 L / min, vacuum degree at 5-200Pa and time of air refining at 20-30 min; 5) relieving the vacuum; hanging the tank to casting position; casting; getting the product. The good effect of this invention is: simple producing craft; high productive efficiency; low power; good environment; low cost.

Description

technical field [0001] The invention relates to a production process of low microcarbon ferrochrome alloy. Background technique [0002] At present, there are three production processes for low-carbon chromium-based ferroalloys. The first one is smelted by raw ore, which is not only limited by mineral resources, but also requires two submerged arc furnaces for double production. The mixed flushing needs to be carried out many times. The production environment is relatively poor, the pollution is serious, the product consumes high power, the production cost is high, the amount of slag produced is large, and the content of chromium trioxide in the slag is high. This process is restricted by the national industrial policy; High-carbon ferrochrome alloy is produced by vacuum resistance furnace method, which has many production links, heavy environmental pollution, high power consumption, long production cycle, low efficiency, difficult equipment maintenance, difficult removal of...

AI Technical Summary

Problems solved by technology

[0002] At present, there are three production processes for low-carbon chromium-based ferroalloys. The first one is smelted by raw ore, which is not only limited by mineral resources, but also requires two submerged arc furnaces for double production. The mixed flushing needs to be carried out many times. The production environment is relatively poor, the pollution is serious, the product consumes high power, the production cost is high, the amount of slag produced is large, and the content of chromium trioxide in the slag is high. This process is restricted by the national industrial policy; High-carbon ferrochromium alloy is produced by vacuum resistance furnace method, which has many production links, heavy environmental pollution, high power consumption, long production cycle, low efficiency, difficult equipment maintenance, difficult removal of product inclusions, and high production cost; the third type It is produced by electrolysis, which has complicated process, serious pollution, high energy consumption and high cost, and is restricted by the national industrial policy