Coke production relies on the availability, cost and quality of coking coal. Depleting coking coal resources and environmental pressure force the metallurgical industry to search for alternative methods to produce coke. Waste spent coffee grounds (biomass) treated via hydrothermal liquefaction (HTL) is an energy-efficient method to produce biochar. In this study the use of HTL biochar as feedstock for the production of a coke substitute was investigated. Wet oxidation treatment of the prepared biochar samples was done with different wet oxidant hydrogen peroxide concentrations (5, 15, 30%). The biochar was treated for different time durations (0.5, 1, 2, 6 and 24 h) and at different temperatures (room temperature and 80 °C). Thereafter, the various samples were characterized and pyrolysed to obtain a coke substitute. Characterization of the various samples before and after thermal treatment was done using Fourier-transform infrared spectroscopy (FTIR), free swelling index, ultimate and proximate analysis, gross calorific value and compressive strength determination. The investigated characteristics of the produced coke substitute obtained from the pyrolysed biochar treated for 24 h with 30 vol% H₂O₂ at room temperature, showed the most promising results when compared to blast furnace coke.

焦炭生产取决于焦煤的可用性，成本和质量。炼焦煤资源的枯竭和环境压力迫使冶金行业寻找生产焦炭的替代方法。通过水热液化（HTL）处理的废咖啡渣（生物质）是一种生产生物炭的节能方法。在这项研究中，研究了使用HTL生物炭作为原料生产焦炭替代品。用不同的湿氧化剂过氧化氢浓度（5％，15％，30％）对制备的生物炭样品进行湿氧化处理。对生物炭进行了不同的持续时间（0.5、1、2、6和24小时）和不同的温度（室温和80°C）处理。之后，表征各种样品并热解以获得焦炭替代物。使用傅里叶变换红外光谱（FTIR），自由溶胀指数，最终和邻近分析，总热值和抗压强度测定，对热处理前后的各种样品进行表征。由30％（体积）的H处理24小时的热解生物炭制得的焦炭代用品的研究特性与高炉焦炭相比，室温下的₂ O ₂表现出最有希望的结果。