开发了钠焙烧-还原浸出联合工艺从废Pd/Al_(2)O_(3)催化剂中回收Pd和Al_(2)O_(3)。钠化焙烧热力学分析表明,在最佳的Na_(2)O/Al_(2)O_(3)摩尔比和温度下,NaOH、Na_(2)CO_(3)和Na_(2)C2O4均可以与Al_(2)O_(3)完全反应生成Na Al O2。NaOH...开发了钠焙烧-还原浸出联合工艺从废Pd/Al_(2)O_(3)催化剂中回收Pd和Al_(2)O_(3)。钠化焙烧热力学分析表明,在最佳的Na_(2)O/Al_(2)O_(3)摩尔比和温度下,NaOH、Na_(2)CO_(3)和Na_(2)C2O4均可以与Al_(2)O_(3)完全反应生成Na Al O2。NaOH、Na_(2)CO_(3)和Na_(2)C_(2)O_(4)的焙烧渣经水浸后,Al_(2)O_(3)浸出率分别为99.6%、61.0%和55.3%。机械活化-NaOH无水焙烧工艺避免了焙烧渣的固结且可获得较高的Al_(2)O_(3)浸出率。N_(2)H_(4)·H_(2)O还原浸出避免了水浸过程中Pd的溶解损失且催化剂中99.7%的Al_(2)O_(3)被浸出。最终得到Na Al O2浸出液和富钯渣,其中有价的铝和钯可被进一步回收。展开更多
Sc_(2)O_(3)was successfully extracted and separated from Bayan Obo tailings by a CaCl_(2)-reductive carbon powder-combinative roasting method.The optimum pro-cess condition was obtained through adjusting specific ef-f...Sc_(2)O_(3)was successfully extracted and separated from Bayan Obo tailings by a CaCl_(2)-reductive carbon powder-combinative roasting method.The optimum pro-cess condition was obtained through adjusting specific ef-fect factors.It is found that Sc_(2)O_(3)with the ratio of 87.51%is leached out under roasting temperature of 800℃for 2 h through adding 73%CaCl_(2),and 20%reductive carbon powder with liquid to solid ratio of 3.Moreover,the specific reaction mechanism during roasting process was investi-gated by thermogravimetric–differential scanning calorimetry(TG-DSC)and X-ray diffraction(XRD)tech-niques.The results show that the main phases(SiO_(2),CaF_(2) and NaFeSi_(2)O_(6))as well as important phases(LiScSi_(2)O_(6),REFCO_(3)and REPO_(4))would turn into new phases(CaFe-SiO_(4),Fe,Ca_(3)(PO_(4))_(2),NaCl,RE_(2)O_(3)and Sc_(2)O_(3))after com-plicated reactions,which effectively break up the original mineral compositions and activate the existing state of containing scandium matter,consequently facilitating the subsequent hydrochloric acid leaching process.展开更多
基金supported by the National Natural Science Foundation of China (No.52004044)the Natural Science Foundation of Chongqing,China (No.CSTB2022NSCQ-MSX0801)+3 种基金the Foundation of Chongqing University of Science and Technology,China (No.ckrc2022030)the Graduate Research Innovation Project of Chongqing University of Science and Technology,China (No.YKJCX2220214)the Science and Technology Innovation Training Program of Chongqing University of Science and Technology,China (No.2022046)the College Students’Innovation and Entrepreneurship Training Program of Chongqing University of Science and Technology,China (No.2022007).
基金the financial support from the Science and Technology Plan of Yunnan Province,China(No.2018ZE001)the National Key Research and Development Program of China(No.2018YFE0110200)+1 种基金the Key Research and Development Program of Hunan Province,China(No.2020SK2125)the Science and Technology Plan of Department of Natural Resources of Hunan Province,China(No.2020-21)。
文摘开发了钠焙烧-还原浸出联合工艺从废Pd/Al_(2)O_(3)催化剂中回收Pd和Al_(2)O_(3)。钠化焙烧热力学分析表明,在最佳的Na_(2)O/Al_(2)O_(3)摩尔比和温度下,NaOH、Na_(2)CO_(3)和Na_(2)C2O4均可以与Al_(2)O_(3)完全反应生成Na Al O2。NaOH、Na_(2)CO_(3)和Na_(2)C_(2)O_(4)的焙烧渣经水浸后,Al_(2)O_(3)浸出率分别为99.6%、61.0%和55.3%。机械活化-NaOH无水焙烧工艺避免了焙烧渣的固结且可获得较高的Al_(2)O_(3)浸出率。N_(2)H_(4)·H_(2)O还原浸出避免了水浸过程中Pd的溶解损失且催化剂中99.7%的Al_(2)O_(3)被浸出。最终得到Na Al O2浸出液和富钯渣,其中有价的铝和钯可被进一步回收。
基金Projects (52074069,52174314) supported by the National Natural Science Foundation of ChinaProjects (E2020501022,E2021501029,E2022501030) supported by the Natural Science Foundation of Hebei Province+2 种基金Projects (N2223027,N2223009) supported by the Fundamental Research Funds for the Central Universities,ChinaProject (ZD2021331) supported by the Science and Technology Project of Hebei Education Department,ChinaProject (22567627H) supported by Performance Subsidy Fund for Key Laboratory of Dielectric and Electrolyte Functional Material of Hebei Province,China。
基金financially supported by the National High Technology Research and Development Program (No. 2013AA031002)。
文摘Sc_(2)O_(3)was successfully extracted and separated from Bayan Obo tailings by a CaCl_(2)-reductive carbon powder-combinative roasting method.The optimum pro-cess condition was obtained through adjusting specific ef-fect factors.It is found that Sc_(2)O_(3)with the ratio of 87.51%is leached out under roasting temperature of 800℃for 2 h through adding 73%CaCl_(2),and 20%reductive carbon powder with liquid to solid ratio of 3.Moreover,the specific reaction mechanism during roasting process was investi-gated by thermogravimetric–differential scanning calorimetry(TG-DSC)and X-ray diffraction(XRD)tech-niques.The results show that the main phases(SiO_(2),CaF_(2) and NaFeSi_(2)O_(6))as well as important phases(LiScSi_(2)O_(6),REFCO_(3)and REPO_(4))would turn into new phases(CaFe-SiO_(4),Fe,Ca_(3)(PO_(4))_(2),NaCl,RE_(2)O_(3)and Sc_(2)O_(3))after com-plicated reactions,which effectively break up the original mineral compositions and activate the existing state of containing scandium matter,consequently facilitating the subsequent hydrochloric acid leaching process.
