The inorganic content of biomass impairs size reduction tool life and the conversion process. Conventional ash extraction relies on furnace combustion that inevitably alters the inorganic compounds due to oxidation and decomposition. This study developed composition-preserving methods for extracting and analyzing extrinsic and intrinsic inorganic compounds. Comprehensive characterization was carried out on selected biomass feedstocks, including corn stover, pine residue, and pine anatomical fractions, to reveal their inorganic species and morphology. The extrinsic inorganic compounds were found to be dominated by quartz, along with other minor minerals, such as albite, microcline, and gehlenite, and have particle sizes ranging from tens to hundreds of micrometers. Among the pine anatomical fractions, the needles contain the highest intrinsic silicon content while the bark trapped the most extrinsic minerals. By correlation of the total ash and extrinsic inorganic contents to the wear behavior, both the extrinsic and intrinsic inorganic compounds were concluded to have made significant contributions to the wear process. The results here validated a new approach to characterize inorganic compounds in biomass and provided fundamental insights for their potential impact on preprocessing tool wear.

中文翻译：

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生物量外在和内在无机化合物的成分保留提取和表征

生物质中的无机物会损害尺寸减小工具的寿命和转化过程。传统的灰分提取依赖于炉子燃烧，由于氧化和分解，不可避免地改变了无机化合物。这项研究开发了用于提取和分析外部和固有无机化合物的成分保留方法。对选定的生物质原料（包括玉米秸秆，松树残留物和松树解剖部分）进行了全面表征，以揭示其无机种类和形态。发现外在的无机化合物与其他次要矿物（如钠长石，微斜晶石和钠钙石）一起被石英所占主导，其粒径范围为数十至数百微米。在松树解剖部位中，针头含有最高的固有硅含量，而树皮则捕获了最多的外在矿物。通过将总灰分和外部无机含量与磨损行为相关联，得出结论，外部和固有无机化合物均对磨损过程做出了重大贡献。此处的结果验证了一种表征生物质中无机化合物的新方法，并为它们对预处理工具磨损的潜在影响提供了基本见解。