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RISS 인기검색어
- 검색키워드
- 저자 : Ju Jinrong (검색결과 3 건)
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Ju Jinrong,Yali Feng,Haoran Li,Hao Wu,Shunliang Liu,Chenglong Xu,Xin Li 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.3
In order to effectively separate and recover copper, cobalt, nickel and manganese from the leaching solution of ocean cobalt-rich crusts, a process of selective precipitation and extraction using precipitation with Na2S solution and solvent extraction with N235 extractant, was proposed. The optimum separation and recovery process conditions were determined through single factor condition experiments. The results show the precipitation efficiency of copper can reach 99.87%, while the precipitation efficiency of cobalt and nickel was 1.23% and 1.08%, respectively, at the initial pH of 0.60. Similarly, under the condition of initial pH of 4.00, 99.18% cobalt and 98.31% nickel were precipitated and only 0.89% manganese was co-precipitated. The mixed cobalt-nickel precipitation was completely dissolved with HCl solution, then N235 extractant was used to extract cobalt from solution. The extraction efficiency of cobalt can exceed 99% though three stages countercurrent extraction under optimal extraction conditions (chloride ion concentration of 9mol/L, the N235 concentration of 30% (v/v), the phase ratio (O/A) of 2, and at 298.15 K for 8min). In addition, thermodynamic calculations showed that the extraction of cobalt from acid leaching solution of ocean cobaltrich crust with N235 as the extractant was an exothermic reaction.
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Jinrong Ju,Yali Feng,Haoran Li,Ben Wang 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.12
Selective extraction of Zn from blast furnace dust can be achieved by the ammonium sulfate roasting-waterleaching process. An innovative method for effective separation of Zn, Fe, and Mn from roasting-water leaching solutionof blast-furnace dust by precipitation-solvent extraction process is proposed in this research. The Fe of leachingsolution was selectively converted into FePO4·2H2O precipitate by using Na2HPO4 as precipitant. The precipitation efficiencyof Fe reached 99.17%, while that of Zn was only 0.20% under the solution pH of 2.2, molar ratio of Na2HPO4 toFe of 1.2 : 1, reaction temperature of 30 oC, and reaction time of 50 min. The zinc in the filtrate was extracted with Cyanex302, and Zn (99.94%) was extracted through two-stage countercurrent extraction under initial pH of 3.4, Cyanex302 concentration of 25%, and O/A of 2 : 1. Subsequently, Zn (99.96%) of the organic phase was stripped using 0.75mol/L sulfuric acid by one-stage countercurrent stripping. Furthermore, according to thermodynamic calculation, it isproved that extracting Zn from sulfuric acid solution with Cyanex 302 is an exothermic reaction. The proposed processflowsheet may be used to efficiently recover Zn and Fe from blast-furnace dust.
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Wenyuan Wang,Yali Feng,Haoran Li,ShunLiang Liu,Jinrong Ju,Yi Yang,Ben Wang 대한환경공학회 2023 Environmental Engineering Research Vol.29 No.3
Chemical waste salt is a hazardous waste generated during chemical production, and it is crucial to complete the recycling of the waste salt in a practical way. In the case of waste salt recycling by rotary kiln pyrolysis carbonization, ringing affects the pyrolysis efficiency and process running, thus a study on waste salt ringing was conducted. The results showed that the particle size is the key to the ring formation in rotary kiln, and pyrolysis temperature, pyrolysis time and temperature distribution in the rotary kiln also affect the material discharge rate during pyrolysis of waste salt in the rotary kiln. Thermogravimetric analysis and SEM images revealed that the volatilization of organic matter in the material due to pyrolysis caused a decrease in the abrasion resistance of the waste salt particle, which was the factor behind the ringing during pyrolysis in the rotary kiln. This study may provide a reference for the implementation of similar waste salt pyrolysis carbonization processes.
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