Analysis and control on sulfur content in process of 120 t converter steelmaking

In order to achieve the stable production of low-sulfur clean steel (w(S)≤0.006%), the thermodynamics of the desulfurization reaction between the slag and steel are calculated,based on the production practice of a certain plant,the relevant sulfur increase factors when making low-sulfur clean steeln 120 t converter of the plant are analyzed.Control measures such as reducing the sulfur content of raw and auxiliary materials and reducing KR desulfurization slag,scrap and slagging materials and optimizing converter smelting process parameters are proposed.It provides a reference for converter smelting low-sulfur molten steel and strengthening end-point sulfur control.The results show that the sulfur-increasing content of raw and auxiliary materials in the furnace less than 0.008 2%,the converter end temperature between 1 640-1 680 ℃,the slag basicity between 3.0-4.0,and the w((FeO)) in the slag between 10%-18%,the slag steel sulfur distribution ratio L_S between 5.11-8.16,and the final sulfur content pass rate of the converter is increased from 80% to 98%.