Coffee is an essential agricultural product and offers the spent coffee grounds (SCG) after brewing. In order to intensify the utilisation of this by-product, various approaches have been investigated into. The mechanical refinement of the SCG by briquetting plays an important role for further upgrading processes. In this work, the briquetting of dried SCG was investigated with and without pre-treatment of the SCG by solid-liquid extraction with toluene or pyrolysis. Furthermore the addition of 5% cellulose as binder and the variation of moisture content from 5% up to 10% and briquetting pressure in the range of 120 MPa–160 MPa was investigated. To evaluate the briquette quality, raw density, compressive strength, and abrasion resistance were determined. The results show that briquetting of pre-treated SCG by extraction leads to an increasing briquette quality, since the oil fraction of 16.12% was removed. Whereas an increasing in briquetting pressure from 120 MPa to 140 MPa leads to a slight increase in briquette quality, a further increase in briquetting pressure results in a decreasing briquette quality. The best briquetting results were achieved for SCG with 10% tapioca starch as binder. At a briquetting pressure of 140 MPa the briquette quality was significantly increased.

咖啡是必不可少的农产品，冲泡后提供废咖啡渣 (SCG)。为了加强这种副产品的利用，已经研究了各种方法。通过压块对 SCG 进行机械改进对于进一步升级工艺起着重要作用。在这项工作中，通过甲苯固液萃取或热解对 SCG 进行预处理和不进行预处理，研究了干燥 SCG 的压块。此外，还研究了添加 5% 纤维素作为粘合剂以及水分含量从 5% 到 10% 和压块压力在 120 MPa-160 MPa 范围内的变化。为了评估团块质量，确定了原始密度、抗压强度和耐磨性。结果表明，由于 16.12% 的油馏分被去除，因此通过提取对预处理的 SCG 进行压块可提高压块质量。压块压力从 120 MPa 增加到 140 MPa 会导致压块质量略有提高，压块压力进一步增加会导致压块质量下降。使用 10% 木薯淀粉作为粘合剂的 SCG 获得了最好的压块效果。在 140 MPa 的压块压力下，压块质量显着提高。使用 10% 木薯淀粉作为粘合剂的 SCG 获得了最好的压块效果。在 140 MPa 的压块压力下，压块质量显着提高。使用 10% 木薯淀粉作为粘合剂的 SCG 获得了最好的压块效果。在 140 MPa 的压块压力下，压块质量显着提高。