Ni-Pd/Al2O3 catalyst in the form of foam for dry methane reforming

In this research, catalytic properties of Ni-Pd/Al2O3 catalyst synthesized by aerosol impregnation method were examined in the dry methane reforming process. First, reticulated ceramic foams were impregnated by ultrasonically nebulized solution of corresponding chlorides and dried. The catalyst was activated by direct hydrogen reduction, without calcination, at only 533 K. The reforming test was carried out at temperatures of 873, 973 and 1023 K. Since CO and H2 are the main products of the dry methane reforming, yields of those gasses were measured and obtained results were a base for conclusions about selectivity, activity and stability of the catalyst

Production of technology metals from waste electronics

The rising criticality of technologically inevitably metals and the continuous growth of the waste electronics promote a scientific need for development of innovative recycling process, both efficient and selective. Experimental results showed primarily that by pyrometallurgical treatment it is difficult to achieve selectivity, and secondary that the distribution of metals in melting products is too complicated, deviating from the experiential and expected. Therefore, application of an integral pyro - hydrometallurgical treatment is suggested for improved raw materials efficiency. Successful implementation of the developed state-of-art technological process, guarantee more efficient approach to recycling processes, production of new materials which supports the concepts of sustainable development and cleaner production. Proposed technological solution is applicable in industry with relatively low investments compared to expected revenues, allowing companies to become competitive in the regional market and beyond, which is particularly important for small and medium enterprises with lower operating capacities. Techno-economic justification and integral pyro - hydrometallurgical process for waste electronics recycling is presented. This paper explains measures for the further development of the recycling industry as a part of circular economy strategy in Serbia

Ni-Pd/Al2O3 catalyst in the form of foam for dry methane reforming

In this research, catalytic properties of Ni-Pd/Al2O3 catalyst synthesized by aerosol impregnation method were examined in the dry methane reforming process. First, reticulated ceramic foams were impregnated by ultrasonically nebulized solution of corresponding chlorides and dried. The catalyst was activated by direct hydrogen reduction, without calcination, at only 533 K. The reforming test was carried out at temperatures of 873, 973 and 1023 K. Since CO and H2 are the main products of the dry methane reforming, yields of those gasses were measured and obtained results were a base for conclusions about selectivity, activity and stability of the catalyst. Acknowledgement: This work was financially supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia, Project No. TR - 34033

Ni and Ni-Pd catalysts supported on reticulated α-Al2O3 based foam

In the presented research, Ni-based catalysts were synthesized. Reticulated α-Al2O3 based foams were impregnated with ultrasonically aerosolized NiCl2 and NiCl2-PdCl2 aqueous solutions, dried at 473 K for 1 h and then reduced by hydrogen at 533 and 633 K for 90 min. Ni loading was 5 wt.%. Modified catalyst contained 0.1 wt.% of added Pd. Reduction of Ni-Pd/Al2O3 sample was almost completed at 533 K. The calcination step was avoided and lower reduction temperature was utilized. Proposed method enables formation of submicron-sized metallic particles and offers a possibility of economical and technological benefits in the catalysts production process

Technological and environmental aspects of nickel production in Serbia

Demand for nickel is constantly growing due to the versatility of its application, at the first place for stainless steel production. Ore reserves and possibility of nickel production of today’s Serbia and in neighboring countries were thoroughly investigated, and presented work is part of a wider project of sublimation of scientific and professional experience in the field of nickel extractive metallurgy on domestic raw materials. Presented research explores the possibility of high pressure sulfuric acid leaching of Serbian lateritic ores from localities Rudjinci, Ba and Lipovac. All three investigated ore deposits behaved differently both during preparation and during hydrometallurgical treatment. As optimal method for ore preparation proved to be crushing-milling-sieving route, but without possibility of concentrate production. Only for Rudjinci ore deposit achieved leaching efficiency reached satisfactory level of 95%. Within presented paper flow-sheet is proposed for processing high-magnesium laterite ores, with iron and magnesium oxide Both could be recirculated and used again in technological process; MgO for iron precipitation and SO2 for production of leaching agent, sulfuric acid. Final decision on the sustainability of the process will be made according to techno-economic and environmental evaluation. Estimated overall impact of the project implementation on the environment is negative

Redesign of secondary magnesium metallurgy in the complex Mg Serbien

In the current study it has been concluded that production of magnesium is only feasible by principles of closing the production cycle through optimization and synergy between primary and secondary magnesium production in order to generate as least as possible waste, emission and pollution in the Pidgeon process. The time of return of investment in redesign of secondary magnesium metallurgy was concluded to be 3.11 years which is the shortest time for this kind of projects. The parameters as the individual discount rate 11.50%, internal rate of return, period of return 19%, positive net present value and profitability index 1.98 are acceptable. The unit capital cost per unit of $5,267/t and unit OPEX of$ 1,395/t were indicative of the economic success of this project and the most appropriate parameters have been achieved. Also, using gas as a fuel instead of coal will reduce OPEX for 8.4%. With this model waste substances are converted into highly profitable resources along with the promotion of sustainability and a cleaner production strategy, which is the ultimate goal for company and society

Ni-Pd/Al2O3 catalyst in the form of foam for dry methane reforming

In this research, catalytic properties of Ni-Pd/Al2O3 catalyst synthesized by aerosol impregnationmethod were examined in the dry methane reforming process. First, reticulated ceramic foamswere impregnated by ultrasonically nebulized solution of corresponding chlorides and dried. Thecatalyst was activated by direct hydrogen reduction, without calcination, at only 533 K. Thereforming test was carried out at temperatures of 873, 973 and 1023 K. Since CO and H2 are themain products of the dry methane reforming, yields of those gasses were measured and obtainedresults were a base for conclusions about selectivity, activity and stability of the catalyst.Acknowledgement: This work was financially supported by the Ministry of Education, Scienceand Technological Development of the Republic of Serbia, Project No. TR - 34033

Production of technology metals from waste electronics

The rising criticality of technologically inevitably metals and the continuous growth of the waste electronics promote a scientific need for development of innovative recycling process, both efficient and selective. Experimental results showed primarily that by pyrometallurgical treatment it is difficult to achieve selectivity, and secondary that the distribution of metals in melting products is too complicated, deviating from the experiential and expected. Therefore, application of an integral pyro - hydrometallurgical treatment is suggested for improved raw materials efficiency. Successful implementation of the developed state-of-art technological process, guarantee more efficient approach to recycling processes, production of new materials which supports the concepts of sustainable development and cleaner production. Proposed technological solution is applicable in industry with relatively low investments compared to expected revenues, allowing companies to become competitive in the regional market and beyond, which is particularly important for small and medium enterprises with lower operating capacities. Techno-economic justification and integral pyro - hydrometallurgical process for waste electronics recycling is presented. This paper explains measures for the further development of the recycling industry as a part of circular economy strategy in Serbia

Nickel production in Serbia-technological and environmental aspects

Demand for nickel is constantly growing due to the versatility of its application, at the first place for stainless steel production. Ore reserves and possibility of nickel production of today’s Serbia and in neighboring countries were thoroughly investigated, and presented work is part of a wider project of sublimation of scientific and professional experience in the field of nickel extractive metallurgy on domestic raw materials. Presented research explores the possibility of high pressure sulfuric acid leaching of Serbian lateritic ores from localities Rudjinci, Ba and Lipovac. All three investigated ore deposits behaved differently both during preparation and during hydrometallurgical treatment. As optimal method for ore preparation proved to be crushing-milling-sieving route, but without possibility of concentrate production. Only for Rudjinci ore deposit achieved leaching efficiency reached satisfactory level of 95%. Within presented paper flow-sheet is proposed for processing high-magnesium laterite ores, with iron and magnesium oxide Both could be recirculated and used again in technological process; MgO for iron precipitation and SO2 for production of leaching agent, sulfuric acid. Final decision on the sustainability of the process will be made according to techno-economic and environmental evaluation. Estimated overall impact of the project implementation on the environment is negative. http://dx.doi.org/10.5937/metmateng1404275

Nickel production in Serbia-technological and environmental aspects

Demand for nickel is constantly growing due to the versatility of its application, at the first place for stainless steel production. Ore reserves and possibility of nickel production of today’s Serbia and in neighboring countries were thoroughly investigated, and presented work is part of a wider project of sublimation of scientific and professional experience in the field of nickel extractive metallurgy on domestic raw materials. Presented research explores the possibility of high pressure sulfuric acid leaching of Serbian lateritic ores from localities Rudjinci, Ba and Lipovac. All three investigated ore deposits behaved differently both during preparation and during hydrometallurgical treatment. As optimal method for ore preparation proved to be crushing-milling-sieving route, but without possibility of concentrate production. Only for Rudjinci ore deposit achieved leaching efficiency reached satisfactory level of 95%. Within presented paper flow-sheet is proposed for processing high-magnesium laterite ores, with iron and magnesium oxide Both could be recirculated and used again in technological process; MgO for iron precipitation and SO2 for production of leaching agent, sulfuric acid. Final decision on the sustainability of the process will be made according to techno-economic and environmental evaluation. Estimated overall impact of the project implementation on the environment is negative