Abstract：The sulfuric acid pickling process of stainless steel produces a large amount of pickling sludge, which contains high content of CaSO4, and valuable metals such as Fe,Cr. Activated carbon will lose its activity after several adsorption, but it still maintains reducing performance. The pellet containing carbon is made by mixing acid sludge and activated carbon and roasting. When the slag and iron are mixed out of the blast furnace, the pellet is thrown into the slag-iron bath for reduction. The Fe, Cr in the acid sludge are reduced and enter the molten iron, and other substances enter the blast furnace slag to achieve the goal of detoxification, absorption and resource utilization of the pickling sludge. In view of the fact that the pickling sludge contains a large amount of S, the paper focuses on discussing the effect of the roasting temperature of pellets, the amount of C, and the amount of pellets added in the smelting process on the distribution behavior of S in each phase, mainly by thermodynamic theoretical calculation, laboratory test and other research methods. The results show that when the pellet C/S is 2 and the roasting temperature is 400 ℃, adding 1% pellets to the slag-iron bath, the w([Sf]) of molten iron at the end of the molten iron bath can be controlled at about 0.01%, and the slag fixation rate can reach 50%. When the pellet C/S is 0.5 and the roasting temperature is 400 ℃ or 800 ℃, adding 3% pellets into the slag-iron bath can also reduce the w([Sf]) to about 0.010%,and the recovery of Fe/Cr in sludge reaches 88.27%, but the sulfur fixation rate of the slag is lower. The study demonstrates that slag-iron bath process of treating pickling sludge can effectively control the w([Sf]) to lower level through reasonable adjustment of the test parameters, and achieve deep desulfurization effects. Meanwhile, Fe/Cr has a high recovery efficiency, before and after the reaction, the slag composition changes is extremely small, which will not affect the safety and subsequent utilization of the blast furnace slag, and has high environmental and economic benefits.
许香帅, 赵峥, 张延玲. 酸洗污泥含碳球团渣铁浴处理过程中硫的分布[J]. 钢铁, 2022, 57(5): 137-145.
XU Xiang-shuai, ZHAO Zheng, ZHANG Yan-ling. Sulfur distribution in slag-iron bath process of treating carbon-containing pellets of pickling sludge[J]. Iron and Steel, 2022, 57(5): 137-145.
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2022, Vol. 57 
