以炉气中SO₂浓度及硫酸亚铁的脱硫率为指标，探究了不同硫酸亚铁水合物、煤炭种类、C/S值（物料中C与S的摩尔比）和温度对热裂解过程的影响。结果表明，硫酸亚铁水合物先脱水再分解，其脱水产生水蒸气汇入生成炉气中，冲淡炉气中SO₂的浓度。当反应温度为800℃、C/S为1时，FeSO₄·H₂O分解产生的炉气里SO₂质量分数可达11.12%，其脱硫率大于99%，煅烧后固相物铁质量分数大于60%，能够满足作为制备硫酸合格原料气和炼铁厂合格铁精粉原料的要求。

Thermal cracking process of ferrous sulfate with coal as a reducing agent is investigated.The effects of ferrous sulfate hydrate,coal type,C/S molar ratio and reaction temperature on the concentration of SO₂ in furnace gas,and the desulfurization rate of ferrous sulfate are studied.The results demonstrate that ferrous sulfate hydrate is dehydrated at first and decomposes then,while water vapor generated from the dehydration dilutes the concentration of SO₂ in the furnace gas.SO₂ concentration in furnace gas can exceed 11.12%,the desulfurization rate of ferrous sulfate can exceed 99%,and iron content in solid phase after calcination can be more than 60% when the reaction temperature is at 800℃ and C/S molar ratio is 1.This technology can provide qualified feedstock for sulfuric acid production and qualified iron concentrate for iron and steel smelting.

杨颜宇(1995-),女,硕士研究生,研究方向为固体废物循环利用,454600324@qq.com