水热加压及氢氧化钾协同活化对半焦孔隙结构影响的实验研究

Variances in Pore Structure of Activated Semi-cokes With KOH and Hydrothermal Under Pressure Synergistic Activation

我国半焦资源丰富,但常规半焦吸附性能有限,限制了其在焦化废水处理、工业废气净化等领域的利用。为改善半焦的孔隙结构,提高其吸附性能,采用水热加压及氢氧化钾协同活化方法对昭通褐煤半焦进行处理,并运用ASAP2020比表面积及孔隙分析仪对活化前后昭通褐煤半焦的孔隙结构进行了表征和分析。结果表明,经过水热加压及氢氧化钾协同活化的半焦较原料半焦比表面积增加17%;而经过水热加压与氢氧化钾分步活化的半焦相应值仅为10%。活化过程对褐煤半焦有造孔、扩孔作用,且协同活化较分步活化更能促进半焦孔隙结构的发展。

Semi-coke resources are very abundant in China, but the adsorption capability of semi-cokes is limited, which restricts their utilization in treating coking wastewater, waste gas and other fields. To improve the pore structure and enhance the adsorption capability of semi-cokes, Zhaotong semi-cokes are treated with KOH and hydrothermal under pressure synergistic activation. The pore structure of semi-cokes is analyzed with ASAP2020 surface area and porosity analyzer. Results show that the specific surface area of semi-cokes increases by 17% after the synergistic activation and just increases by 10% after the distributed activation processing. The synergistic activation shows more effective to improve the pore structure of semi-cokes than the distributed activation processing.