The generated process losses such as broken ware from shaping, if not recycled internally, are considered as waste. Furthermore, the collected process losses are provided to external recycling companies or waste disposal facilities. This study investigated the recycling potential of waste alumina powder, which was accumulated during industrial machining of the ceramic green body. The samples containing up to 20 dwb. % (dwb – weight amounts based on dry matter) of powdered waste alumina were prepared by slip casting method and conventionally sintered at various sintering conditions according to Box-Behnken design. Sintered samples were characterized for density, microstructure, hardness, and indentation fracture toughness and compared with samples made of pure commercial alumina. The study shows that the addition of waste alumina up to 20 dwb. % sintered at higher sintering temperature with dwell time 1–3 h did not negatively affect the hardness, nor the indentation fracture toughness of the sintered samples. The enabled recycling potential of waste alumina powder can have direct positive environmental impact, although economic benefits cannot be ignored.

所产生的过程损失（例如成型时产生的残破品）（如果未在内部回收）则被视为浪费。此外，所收集的过程损失将提供给外部回收公司或废物处理设施。这项研究调查了在陶瓷生坯的工业加工过程中积累的废氧化铝粉的回收潜力。样品含有高达20 dwb。％（dwb-基于干物质的重量）的粉状废氧化铝是通过滑模铸造法制备的，并且根据Box-Behnken设计，通常在各种烧结条件下进行烧结。对烧结样品的密度，微观结构，硬度和压痕断裂韧性进行了表征，并与纯商品氧化铝制成的样品进行了比较。研究表明，添加废氧化铝高达20 dwb。在较高的烧结温度下烧结，烧结时间为1-3h的烧结百分比对烧结后的样品的硬度和压痕断裂韧性均无不利影响。尽管不能忽视经济效益，但废氧化铝粉的循环利用潜力会直接对环境产生积极影响。