Slag conditioning method for converter slag-splashing converter-protection technology

Abstract

A disclosed slag conditioning method for converter slag-splashing converter-protection technology comprises the following steps: 1) keeping all or part of slag left after converter tapping is finished; and 2) pouring 5-10 Kg of raw dolomite and 15-20 Kg of coke into per ton of the slag, mixing uniformly for slag conditioning. According to the slag conditioning method, aiming at a melting process during which the converter final slag has high oxidizability, coke and raw dolomite are added into slag, so that MgO in the slag is easy to saturate, and thus the service life of converter lining is prolonged; additionally, because the main component of raw dolomite is MgCO3, MgO generated by decomposition of the raw dolomite helps to improve the viscosity of the slag, and a slag splashing layer is easy to form; also the decomposition reaction is an endothermic reaction, so that the slag temperature is reduced; and more importantly, CO2 gas generated by the decomposition reaction helps to violently stir a molten pool and accelerate the reaction of coke and slag, so that the method provided by the invention helps to shorten the slag splashing time, improve the service life of the converter, reduce iron loss and further improve molten steel yielding rate.

Description

technical field [0001] The invention relates to metallurgical technology, in particular to a slag conditioning method used in a converter slag splashing protection process. Background technique [0002] Furnace age is a comprehensive technical and economic indicator of converter steelmaking. Increasing the furnace age can not only reduce the consumption of refractory materials, improve the operation rate and reduce production costs, but also help to promote a virtuous circle of production. The converter lining works under high temperature and high oxidizing conditions, and is usually eroded at a speed of 0.2-0.8mm / furnace. In order to ensure the normal production of the converter and improve the life of the furnace lining, Chinese metallurgical workers have done a lot of work. Among them, the slag splashing protects the furnace It is a new technology developed in recent years to improve the furnace age. It has achieved obvious results in the production of a large number of ir...

AI Technical Summary

Problems solved by technology

In the converter slag splash protection process, after the steel is exhausted and all or part of the slag is left, it is necessary to observe the thickness of the slag and the temperature, and then decide whether to add a slag adjustment agent. Among them, when the final slag of the converter is too thin, splashing will occur. Due to the problems of long slag time and difficult slag splashing, there are two main methods of slag adjustment in the existing converter slag splashing protection process: first, adding magnesium balls (the main component of magnesium balls is Mg) and coke to the slag; Second, adding light-burned dolomite (mainly composed of MgO) and coke, but the existing slag adjustment method has the following disadvantages: 1) The slag splashing time is too long; 2) Iron loss is relatively large; 1) Magnesium balls and light-burned dolomite The price is high, which is not conducive to cost control