关键词: 浮选尾煤高价值利用, 生物质共热解, 负载型催化剂, 改性煤矸石, 金属离子

Abstract: Flotation tailings is mainly stockpiled in coking coal preparation plants in China, which has caused serious environmental pollution, and its high-value application is imminent. In this paper, the flotation tail coal of Shanxi Coking Coal Group was selected as raw material, and the hydrogen rich fuel gas was prepared by co-catalytic pyrolysis of flotation tailings and pine branch after loading iron, calcium and potassium ions in different load methods in a fixed bed reactor. The results show that after the addition of catalyst, the semi-coke yield of flotation tailings and pine branch co-pyrolysis test decreases significantly, and the gas yield increases significantly, indicating that the addition of catalyst has a positive role in promoting the gas product yield and calorific value of co-pyrolysis. In general, iron-series catalyst > calcium-series catalyst > potassium-series catalyst. The different preparation methods of catalysts also have different effects on the co-pyrolysis gas products. As for the calorific value of gas products, the order from strong to weak is loading type > impregnation mixing type > mechanical mixing type; For the H2 yield of the target gas product, the order from strong to weak is impregnation mixing type > loading type > mechanical mixing type; There is no significant difference in the load methods of the catalyst for the CO yield of the target gas product; As for the yield of the target gas product CH4, the addition of potassium-series catalyst inhibited it; For the CO2 yield of the target gas product, the inhibitory effect of the catalyst on it from strong to weak is potassium-series catalyst > calcium-series catalyst > iron-series catalyst. These experimental results hope to provide industrial reference for the high-value application of the co-catalytic pyrolysis system of flotation tailings and pine branch.