The research and application of biochars enriched with minerals have increased in recent years; however, the mineral fraction used consists of specific minerals, such as clay minerals and synthesized compounds. In this work, the effects of adding two specific soil types (sandy and clayey) to rice and coffee husks in order to generate biochars via pyrolysis was investigated. Chemical, physical–chemical, thermal, spectroscopic and crystallographic analyses were conducted on the produced biochars. The study confirmed that the presence of mineral soils during the pyrolysis process increases the yield, C retention ratio, and specific surface area. It also decreases the pH, cation exchange capacity (CEC), nutrient content, and carbon-to-nitrogen ratio of biochars. However, the biochars produced by mixing coffee husks and mineral soils still demonstrate a capacity to increase the pH and the CEC of tropical soils. In addition, increased C retention demonstrates an environmental benefit of this biochar production method. Biomass pyrolysis combined with clayey soil results in a biochar with a higher degree of aromaticity and higher thermal stability when compared to biomass pyrolysis alone. These characteristics give the biochar a recalcitrant character, without the necessity for steps related to the synthesis of specific mineral compounds, which reduces the economic and energy cost of the process.

近年来，富含矿物质的生物炭的研究和应用有所增加。但是，所使用的矿物级分由特定矿物组成，例如粘土矿物和合成化合物。在这项工作中，研究了向稻壳和咖啡果壳中添加两种特定土壤类​​型（桑迪和黏土）以通过热解产生生物炭的效果。对产生的生物炭进行了化学，物理化学，热学，光谱学和晶体学分析。该研究证实，热解过程中存在矿物土壤可提高产量，碳保留率和比表面积。它还会降低pH，阳离子交换容量（CEC），营养成分和生物炭的碳氮比。然而，通过混合咖啡果皮和矿物土壤产生的生物炭仍显示出增加热带土壤的pH值和CEC的能力。此外，增加的碳保留量证明了这种生物炭生产方法的环境效益。与单独的生物质热解相比，生物质热解与黏性土壤相结合可产生具有更高芳香度和更高热稳定性的生物炭。这些特性使生物炭具有顽强的特性，而无需进行与特定矿物化合物合成相关的步骤，从而降低了该方法的经济和能源成本。与单独的生物质热解相比，生物质热解与黏性土壤相结合可产生具有更高芳香度和更高热稳定性的生物炭。这些特性使生物炭具有顽强的特性，而无需进行与特定矿物化合物合成相关的步骤，从而降低了该方法的经济和能源成本。与单独的生物质热解相比，生物质热解与黏性土壤相结合可产生具有更高芳香度和更高热稳定性的生物炭。这些特性使生物炭具有顽强的特性，而无需进行与特定矿物化合物合成相关的步骤，从而降低了该方法的经济和能源成本。