Bismuth core spun yarn feeding method

Abstract

The invention discloses a bismuth core spun yarn feeding method which comprises the following steps of: controlling the temperature of liquid steel below the boiling point of bismuth or within 40 DEG C above the boiling point of bismuth, agitating the liquid steel at the bottom of the steel ladle by using argon or nitrogen, and feeding the bismuth core spun yarn into the liquid steel through a yarn feeding machine. The bismuth core spun yarn is originally created in domestic and is fed into the liquid steel through the yarn feeding machine by controlling the technological parameters such as liquid steel temperature, argon or nitrogen agitation strength, yarn feeding speed and the like, so that the recovery rate of bismuth is greatly increased and can reach 55-75%, recovery is stable, component control is accurate, the cost is also lowered, the overflow of bismuth steam is reduced, and pollution is lowered.

Description

technical field [0001] The invention relates to a feeding method of bismuth cored wire, which belongs to the technical field of metallurgy. Background technique [0002] At present, in the production process of iron and steel plants, bismuth blocks or bismuth ingots are usually used to directly add to molten steel. Since the boiling point of bismuth is only 1560°C, it is very easy to vaporize at high temperature, resulting in a low recovery rate of bismuth, which is only 10~ 30%, and the recovery is unstable, and the composition control is difficult; the cost is also high, and the price of bismuth is calculated at 100,000 yuan / ton. If the bismuth content in the steel is 0.1%, the cost of adding bismuth blocks or bismuth ingots is 333~ 1000 yuan; in the process of adding bismuth blocks or bismuth ingots, bismuth steam overflows a lot, causing serious pollution. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a bi...

AI Technical Summary

Problems solved by technology

[0002] At present, in the production process of iron and steel plants, bismuth blocks or bismuth ingots are usually used to add directly to molten steel. Since the boiling point of bismuth is only 1560 ° C, it is extremely It is easy to vaporize, resulting in a low recovery rate of bismuth, which is only 10-30%, and the recovery is unstable, and the composition control is difficult; the cost is also high, and the price of bismuth is calculated at 100,000 yuan / ton. If the bismuth content in steel is 0.1%, the cost of adding bismuth blocks or bismuth ingots is 333 to 1,000 yuan; during the process of adding bismuth blocks or bismuth ingots, bismuth steam overflows a lot, and the pollution is relatively large