Abstract:

The Fe-Zn-based waste desulfurizer, coal and Na ₂CO ₃ were used as raw materials to carry out high-temperature carbon thermal reduction reaction, and iron-carbon materials were prepared to realize the separation of Zn and S. It is expected to realize the comprehensive utilization of waste desulfurizer. The effect of different preparation parameters ( e. g., ratios, temperature, time) were investigated to improve the removal efficiency of Zn/S and obtain high-quality Fe-C materials. The best results can be achieved with separation efficiency of Zn and S above 95% with the ratio of 1/1/1.5 for coal/waste desulfurizer/Na ₂CO ₃ at 900℃ for 2 h. Moreover, the specific surface area of the prepared Fe-C material can reach as high as 193.6 m ²/g with the mesoporous volume of 0.028 cm ³/g. In addition, the micro-electrolysis-Fenton test showed the removal efficiency of COD for the as-prepared Fe-C material are 41.78% and 73.56% without/with H ₂O ₂ (H ₂O ₂=COD=1500 mg/L), respectively, which is much better than commercial Fe-C material with the removal efficiency of 8.43% and 48.43% on the same condition. These results demonstrate the heat treatment process of waste desulfurizer with Buliangou-coal and Na ₂CO ₃ may be an effective way for its resource utilization to separate Zn and S as well as produce Fe-C material.

Key words: Fe-Zn-based waste desulfurizer, carbothermal reaction, micro-electrolysis-Fenton, COD

摘要：

以Fe-Zn基废脱硫剂、煤、Na ₂CO ₃为原料进行高温炭热还原反应，制备了铁碳材料，实现了Zn和S的分离，有望能实现废脱硫剂的综合利用。考察不同工艺条件（配比，温度，时间）对铁碳材料品质，Zn单质分离效率和Na ₂S的收率影响。结果表明： 反应温度≥900℃，煤∶废脱硫剂≥1，Na ₂CO ₃∶废脱硫剂≥1.5，反应时长≥2 h，Zn、S的分离回收效率可达到95%以上。且900℃制备的铁碳材料比表面高达193.6 m ²/g，介孔孔体积为0.028 cm ³/g，炭均匀附着于铁骨架。微电解-芬顿联用降解有机废水实验表明：仅微电解或微电解-芬顿联用（H ₂O ₂=COD=1500 mg/L）时，自制铁碳材料的稳定化学需氧量（COD）去除效率（41.78%、73.56%）都高于商业铁碳（8.43%、48.43%)。本文实验结果表明废脱硫剂与煤和碳酸钠混烧可实现废脱硫剂中Zn与S的分离回收，成功获得了比表面高、去除COD性能好的铁碳材料。

关键词: Fe-Zn基废脱硫剂, 炭热还原, 微电解-芬顿, COD