LI Qian, HAN Yuqi, ZHANG Yan, et al. Resource utilization of high aluminum alkaline waste solution to prepare active alumina carrier[J]. Journal of Mining Science and Technology, 2025, 10(3): 563-572. DOI: 10.19606/j.cnki.jmst.2025013
Citation: LI Qian, HAN Yuqi, ZHANG Yan, et al. Resource utilization of high aluminum alkaline waste solution to prepare active alumina carrier[J]. Journal of Mining Science and Technology, 2025, 10(3): 563-572. DOI: 10.19606/j.cnki.jmst.2025013

Resource utilization of high aluminum alkaline waste solution to prepare active alumina carrier

  • The recycling of precious metals from spent aluminum-based catalysts generates a large amount of high-Al alkaline waste solutions, which not only cause a serious waste of aluminum resources, but also may have a negative impact on the environment due to their strong alkalinity. At present, there are few researches on the resource utilization of these high-Al alkaline waste solutions, an investigation into the re-preparation of active alumina carrier from a high-Al alkaline waste solution (Al 6.594 g/L, pH 14) of spent Pd-Al2O3 catalysts by the carbonating-roasting process was performed in this paper. First, the carbonating method was adopted to treat the waste solution, converting the Al therein to pseudo-boehmite; then, the pseudo-boehmite underwent roasting to re-make alumina carrier. Experimental results showed that the P content of 2% ~3% and the caustic ratio (i.e., Na2O to Al2O3 ratio) of 1.5 in the waste solutions are conducive to the significant increase in the specific surface area and dispersion index for the pseudo-boehmite products. In addition, the pseudo-boehmite, after performing, was subjected to roasting under the conditions of temperature 450 ℃, holding time 3.5 h, and heating rate 100 ℃/h, which successfully obtained γ-Al2O3 catalyst carrier that meet the product quality index. This process can achieve the high-efficient resource reuse of high-Al alkaline waste solutions with eco-friendliness and without generation of the three wastes, thus making it promising for industrial application.
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