Production technology of LF refinement submerged arc deoxidizing slag

Abstract

The invention provides a production technology of LF refinement submerged arc deoxidizing slag. The technology is characterized in that the mass percentage ratio of raw materials comprising LF refinement furnace waste slag, limestone powder, petroleum coke powder and alloy powder is 80:17:2:1, one ton of the raw materials is added four times, the adding time each time is 13-15min, and the raw materials are stirred for 20-30min after the addition ending to obtain the submerged arc deoxidizing slag; the working temperature is -30 - +40DEG C, and the pressure is 1.03*10<5>Pa; the LF refinement furnace waste slag selects uncrushed waste slag, and is crushed to 5-50mm particles for use; the granularities of the alloy powder, the limestone powder and the petroleum coke powder are less than 10mm; and the submerged arc deoxidizing slag is added to the surfaces of ladles in a manual or mechanical mode according to 5-20kg / ton steel during the LF power delivery.

Description

technical field [0001] The invention relates to the utilization of solid waste in steelworks, especially adding a small amount of petroleum coke powder to the LF refining furnace waste slag, limestone powder, and powder garbage produced by the ferroalloy system, and preparing submerged arc deoxidation slag for reuse in LF refining, with remarkable effect . Background technique [0002] LF refining furnace is the most effective refining process for large steel mills at home and abroad. Its technological feature is that the molten steel is heated by an electric arc in the ladle, and the molten steel is deeply deoxidized through the steel slag on the upper part of the ladle. Due to the arc heating mode, the temperature in the arc area is as high as 3000-6000°C. If the arc is not shielded, the arc in the arc area will have a great negative impact on the smelting process, which is manifested in low thermal efficiency and accelerated erosion of the refractory material on the inner...

AI Technical Summary

Problems solved by technology

(4) Ren Xue and Li Liaosha stated in the article "Resource characteristics of LF furnace refining slag" published in "Journal of Anhui University of Technology" that "LF furnace refining slag (also called calcium aluminate) has uniform composition and low melting point. , fast melting speed, shortening refining time, and fluorine-free have attracted more and more attention, but its utilization is only in the exploration of the process, and there are few reports on the research of high added value and refined utilization. Its efficient and comprehensive utilization

However, the presence of sulfur in the slag limits the recycling of the waste slag” content expression

From the above information, it can be known that LF refining furnace waste slag has not been applied to the process of developing LF submerged arc deoxidation slag on a large scale.