TY - JOUR A1 - Besra, Laxmidhar A1 - Sengupta, Dilip A1 - Roy, S. A1 - Ay, Peter T1 - Polymer adsorption: its correlation with flocculation and dewatering of kaolin Suspension in the presence and absence of surfactant" KW - Flocculation KW - Dewatering KW - Polymer KW - Surfactant Y1 - 2002 ER - TY - JOUR A1 - Besra, Laxmidhar A1 - Sengupta, Dilip A1 - Roy, S. A1 - Ay, Peter T1 - Flocculation and dewatering of kaolin suspensions in the presence of polyacrylamide and surfactant KW - Flocculation KW - Dewatering KW - Polymer KW - Surfactant Y1 - 2002 ER - TY - CHAP A1 - Missagia, Bruna A1 - Guerrero, Cinthya A1 - Narra, Satyanarayana A1 - Krautz, Hans Joachim A1 - Ay, Peter T1 - Physical characterization of Brazilian agricultural and forestry residues aiming the production of energy pellets Y1 - 2010 ER - TY - GEN A1 - Missagia, Bruna A1 - Guerrero, Cinthya A1 - Narra, Satyanarayana A1 - Sun, Yaoming A1 - Ay, Peter A1 - Krautz, Hans Joachim T1 - Physicomechanical properties of rice husk pellets for energy generation Y1 - 2011 ER - TY - CHAP A1 - Markowski, Jens A1 - Logsch, Florian A1 - Ay, Peter A1 - Kanthak, Manfred A1 - Müller, Bodo T1 - Recycling of non-ferrous metals, precious metals and rare earth metals from MSW T2 - Proceedings, XXVII. IMPC, Santiago de Chile, 2014 N2 - Presently the global commodity situation for non ferrous-, precious- and rare metals is characterized by a strong increase in onsumption and a simultaneous shortage of materials derived from primary sources. So the use of secondary raw materials gains is important due to economic and ecological reasons. Non Ferrous-, precious- and rare earth metals were detected in household waste (Municipal solid waste, MSW) for years. In MSW-treatments plants NF-metals are actually mostly separated from dried fractions. The separation of these metals is carried out with the aim of removing particles which disrupt further processing. A selective enrichment of individual non-ferrous metals has not been carried out previously. The separated fractions contain mixtures of Al, Cu, Zn, Pb, Sn, alloys, precious metals (e. g. Au, Ag, Pt) and rare metals (Ga, In, Nd etc.) along with considerable amounts of contaminations. The R&D project “NE-Rec” selectively processes the coarsely separated non-ferrous-metal-conglomerates increasing the concentration of targeted metals. Metals and metal mixtures are concentrated by sorting steps and the impurities are discharged from the process. Still contaminated precious metals are then subjected to a wet-chemical treatment. So metals can be specifically brought into solution or can be precipitated to separate unwanted components (inerts, polymers, foreign metals). Further the relevant metals will be concentrated by thermal-metallurgical processes. The technology, developed in the R&D project, enables identification, separation and processing of non-ferrous metals, precious metals and REM in household waste and transfers them into further processable individual fractions. KW - Recycling KW - NF metals Y1 - 2014 SP - 237 EP - 245 PB - GECAMIN CY - Santiago de Chile ER - TY - CHAP A1 - Narra, Satyanarayana A1 - Brinker, Mona A1 - Ay, Peter T1 - Particle size distribution of communited and liberated cereal straws measured with different image analysis systems and their characteristic influence on mechanical pellets quality T2 - XXVI International Mineral Processing Congress - IMPC 2012 : New Delhi, India, September 24 - 28, 2012 Y1 - 2012 SN - 81-901714-3-7 PB - New Delhi ER - TY - CHAP A1 - Narra, Satyanarayana A1 - Dasgupta, Sunanda A1 - Ay, Peter A1 - Zeng, T. A1 - Weller, N. T1 - Pelletisation of Rye- and Wheat straw with additives T2 - 19th European Biomass Conference and Exhibition, proceedings, ICC Berlin International Congress Center Berlin, Germany, conference 6 - 10 June 2011 Y1 - 2011 SN - 978-88-89407-55-7 PB - ETA-Florence Renewable Energies CY - Florence ER - TY - CHAP A1 - Narra, Satyanarayana A1 - Glaser, Claudia A1 - Ay, Peter T1 - Abrasion and strength of biomass pellets as main mechanical stability characteristics T2 - 19th European Biomass Conference and Exhibition, proceedings, ICC Berlin International Congress Center Berlin, Germany, conference 6 - 10 June 2011 Y1 - 2011 SN - 978-88-89407-55-7 PB - ETA-Florence Renewable Energies CY - Florence ER - TY - CHAP A1 - Karthikeyan, J. A1 - Ay, Peter A1 - Narra, Satyanarayana T1 - Energy Production from Agricultural residues and Crop processing Wastes: Some Problems and Perspectives T2 - International Conference on Green Power Generation: Vision 2020 Y1 - 2010 U6 - https://doi.org/10.13140/2.1.3330.8965 ER - TY - CHAP A1 - Narra, Satyanarayana A1 - Glaser, Claudia A1 - Gusovius, Hans-Jörg A1 - Ay, Peter T1 - Comparison of grinding and liberation processes for stalky biomass materials as a prerequisite for production of energy pellets with high calorific value T2 - XXV International Mineral Processing Congress, IMPC 2010, "Smarter processing for the future", Brisbane, Australia 6-10 September 2010, congress proceedings Y1 - 2010 SN - 978-1-921522-28-4 PB - AusIMM CY - Carlton South, Australia ER - TY - CHAP A1 - Narra, Satyanarayana A1 - Glaser, Claudia A1 - Gusovius, Hans-Jörg A1 - Ay, Peter T1 - Pelletisation of cereal straws as a source of energy after specific communition processes T2 - 18th European Biomass Conference and Exhibition, proceedings of the international conference held in Lyon, France, 3 - 7 May 2010 Y1 - 2010 SN - 978-88-89407-56-5 PB - ETA-Florence Renewable Energies CY - Florence ER - TY - CHAP A1 - Jurischka, Constantin A1 - Peda, S. A1 - Narra, Satyanarayana A1 - Smieszek, Marlene A1 - Stollberg, Christian A1 - Ay, Peter A1 - Kay, M. T1 - Innovative technologies for production of highly pure substances and bio fine chemicals from plants T2 - 18th European Biomass Conference and Exhibition, proceedings of the international conference held in Lyon, France, 3 - 7 May 2010 Y1 - 2010 SN - 978-88-89407-56-5 PB - ETA-Florence Renewable Energies CY - Florence ER - TY - CHAP A1 - Markowski, Jens A1 - Narra, Satyanarayana A1 - Ay, Peter A1 - Pempel, Harry A1 - Müller, Mike T1 - Automatic disassembly and recycling of lithium-traction-accumulators T2 - Proceedings, XXVII. IMPC, Santiago de Chile, 2014 N2 - Within the next few years major changes in mobility are expected. Increasing numbers of electric powered cars, electrobikes and E-Scooters define the transport sector. Recently lithium based traction batteries as storage medium have led into matrurity of series production combining high electrical efficiencies with low weights and compact dimensions. Due to the relatively young development with lithium batteries utilization, only few investigation were conducted regarding their recycling. Conventional battery recycling processes can not be applied due to differences in design and chemistry. So an automated disassembly and processing procedure for lithium traction batteries has been developed in the R/D-project "Li-WERT". Instead of complete smelting of the batteries without pretreatment, an automated disassembly and specific treatment of the material streams was realised, adjusted to the needs of the subsequent recovery technologies. A higher quality, with reduced expenses for the separation of fine-grained or fused material mixes, can be obtained for the individual components. The automated disassembly using an industrial robot significantly reduces dangers for the operating crew. The selective disassembly and beneficiation allows full recovery of the fractions. The batteries will be disassembled to cell level by the industrial robot. Anodes, cathodes, and separation layers are isolated and processed. The technology is designed, that no waste is generated for disposal. The pelletised cathode coating and the other separated metals (stainless steel, copper, aluminum) can be used in respective metallurgical plants. Circuit boards and plug contacts are also coveted secondary raw materials for reuse. The process is modular and offers high flexibility, e. g. for new battery types/ sizes by quick adjustment of the robot and tool change. Adaptation to other cathode materials (e. g. Li[FePO]) is possible. After finishing the R/D-project, a pilot plant for demontage was realised in 2013. KW - lithium traction accumulator KW - dismantling KW - recycling Y1 - 2014 SP - 227 EP - 236 PB - GECAMIN CY - Santiago de Chile ER - TY - CHAP A1 - Markowski, Jens A1 - Narra, Satyanarayana A1 - Ay, Peter A1 - Hein, Christian A1 - Weber, Alfred T1 - Production of agglomerates from iron-containing fines from the ASR-recycling processes for its use in blast furnaces T2 - XXVI International Mineral Processing Congress - IMPC 2012 : New Delhi, India, September 24 - 28, 2012, vol. 1 N2 - The EU Directive 2000/53/EC on end-of life vehicles (ELVs) states that in 2015 at least 85 wt.-% of a vehicle has to be reused or recycled. This result in the obligatory need to separate additionally metallic and other components of the automotive shredder residues (ASR), so that they can be professionally prepared for recycling and reuse further. Currently the iron-containing fines of ASR are deposited as it is not possible to process in blast furnaces due to its particle size (< 4 mm), composition and material properties. Additionally problems are also caused in handling and transportation (dust) of the material. This work focuses mainly on the ASR materials utilization in blast furnaces. Material was further separated into two consecutive fractions by carrying out repeated crushing and magnetic separation twice. The two fractions have significantly higher iron content (up to 75 wt.-%) compared to the initial material mixture. The materials were assessed for their usage in blast furnaces based on the possible pelletisation with and without binders, stability of pellets, shape and size of pellets, etc. Pelletisation of the material was carried out with a single mould pellet press. Further lignite coal was added to the mixture as additive which improved the pelletisation behavior and the mechanical stability of pellets. Lignite coal was chosen as reducing agent in the blast furnace process contributing towards additional savings in energy supplied. The experiments reveal that the production of pellets from iron-containing fines is possible with a lignite coal admixture of about 15 wt.-%. These pellets displayed good mechanical stability and can be used in blast furnace processes in recovery of the recyclable metals which are currently not recycled. The recycling of not yet recyclable metals would reduce the deposition and can be easily adopted into the economic cycle by their utilization. KW - Automotive shredder residue KW - Fe-fines KW - Agglomeration Y1 - 2012 SN - 81-901714-3-7 CY - New Delhi ER - TY - GEN A1 - Narra, Satyanarayana A1 - Tao, Yonggui A1 - Glaser, Claudia A1 - Gusovius, Hans-Jörg A1 - Ay, Peter T1 - Increasing the calorific value of Rye straw pellets with biogenous and fossil additives T2 - Energy and Fuels Y1 - 2010 SN - 0887-0624 VL - 24 IS - 9 SP - 5228 EP - 5234 ER - TY - CHAP A1 - Narra, Satyanarayana A1 - Ay, Peter ED - Mendez-Vilas, A. T1 - Build-up granulation of lignin sludge’s as innovative process improving its energy efficiency T2 - Fuelling the future : advances in science & technologies for every generation, transmission and storage Y1 - 2012 SN - 978-1-61233-558-2 SP - 9 EP - 14 PB - BrownWalker Press CY - Boca Faton, FL ER - TY - CHAP A1 - Narra, Satyanarayana A1 - Glaser, Claudia A1 - Gusovius, Hans-Jörg A1 - Stollberg, Christian A1 - Ay, Peter ED - Zaikov, Gennadij E. ED - Pudel, Frank ED - Spychalski, Grzegorz T1 - Agricultural residues as a renewable source of bioenergy with special focus on cereal straws T2 - Renewable resources and biotechnology for material applications Y1 - 2011 SN - 978-1-61209-521-9 SP - 67 EP - 79 PB - Nova Publishers CY - Magdeburg ER - TY - CHAP A1 - Narra, Satyanarayana A1 - Logsch, Florian A1 - Ay, Peter T1 - Filtration resistance of the acid treated technical lignin granules and suspensions T2 - XXVII International Mineral Processing Congress, 20 - 24 October 2014, Chile, Santiago de Chile Y1 - 2014 SP - 206 EP - 213 ER - TY - CHAP A1 - Narra, Satyanarayana A1 - Geldt, Elena A1 - Glaser, Claudia A1 - Ay, Peter T1 - Technical realization of the innovative roll-agglomeration of bast fibres in industrial scale T2 - XXVII International Mineral Processing Congress, 20 - 24 October 2014, Chile, Santiago de Chile Y1 - 2014 SP - 345 EP - 355 ER - TY - GEN A1 - Oyegbile, Benjamin A1 - Ay, Peter A1 - Narra, Satyanarayana T1 - Optimization of Physicochemical Process for Pre-treatment of Suspension by Flocculation Prior to Dewatering T2 - Desalination and water treatment Y1 - 2016 U6 - https://doi.org/10.1080/19443994.2015.1043591 SN - 1944-3986 N1 - Presented at the International Congress on Water, Waste and Energy Management 16–18 July 2014, Porto, Portugal VL - 57 IS - 6 SP - 2726 EP - 2736 ER - TY - CHAP A1 - Narra, Satyanarayana A1 - Gruhn, M. A1 - Ay, Peter T1 - Production of carbon fibres from technical lignin granules T2 - 21st European Biomass Conference and Exhibition, Copenhagen, Denmark, 3 - 7 June 2013 Y1 - 2013 U6 - https://doi.org/10.13140/RG.2.1.2139.0886 PB - ETA-Florence Renewable Energies ER - TY - CHAP A1 - Narra, Satyanarayana A1 - Aslanjan, Jana A1 - Ay, Peter T1 - Macroencapsulation of biogas residues increasing the fertilizer efficiency T2 - 21st European Biomass Conference and Exhibition, Copenhagen, Denmark, 3 - 7 June 2013 Y1 - 2013 U6 - https://doi.org/10.13140/RG.2.1.3187.6642 PB - ETA-Florence Renewable Energies ER - TY - CHAP A1 - Narra, Satyanarayana A1 - Logsch, Florian A1 - Glaser, Claudia A1 - Ay, Peter T1 - Sludge-pelleting of paper and pulp residues T2 - XXVI International Mineral Processing Congress - IMPC 2012, New Delhi, India, September 24 - 28, 2012 Y1 - 2012 SN - 81-901714-3-7 SP - 03723 EP - 03739 CY - New Dehli ER - TY - PAT A1 - Ay, Peter A1 - Perwin, Jörg A1 - Gusovius, Hans-Jörg A1 - Hildebrandt, Sven T1 - Method and device for the continuous production of fiber agglomerate N2 - The invention relates to a method and device for the continuous production of fiber agglomerates by rolling agglomeration. For the production of an agglomerate, a portion of the fiber material is introduced into a ring-shape roller table which closed on all sides except for an input opening an an output opening. The fiber material portion introduced into the roller table is transported through the roller table by means of a relative movement of two surfaces of the roller table toward each other, the surfaces lying opposite each other. The fiber material is compressed in the roller table and finally discharged from an output opening of the roller table as fiber agglomerate. According to the invitation, the portioning of the fiber material is carried out by the pulling of an amount of fibers out of a stock of corresponding fiber materials is provided on a supply table for each input opening of a roller table, and portions are continously pulled out of said stock by the repeated movement through the sock of carrier means of a pulling device designed therefor and released into the roller table. KW - roller table, rollagglomeration, fiber agglomeration Y1 - 2008 ER - TY - CHAP A1 - Gaydardzhiev, Stoyan A1 - Ay, Peter ED - Pratsinis, Sotiris E. T1 - Implication of surface charge effects in colour removal from effluents by chemical coagulation in the case of CI Reactive Blue dye T2 - Partec 2004, proceedings, Nürnberg, Germany 16 - 18 march 2004, International Congress for Particle Technology KW - Flocculation Y1 - 2004 PB - NürnbergMesse-GmbH CY - Nürnberg ER - TY - GEN A1 - Walaszek, Wiktoria A1 - Ay, Peter T1 - Pelleting flocculation - an alternitive technique to optimise sludge conditioning T2 - International journal of mineral processing KW - pelleting flocculation Y1 - 2005 VL - 76 IS - 3 SP - 173 EP - 180 ER -