Search Results - "Nyembwe, K."

SUSTAINABILITY ASSESSMENT OF THERMAL AND MECHANICAL RECLAMATION OF FOUNDRY CHROMITE SAND by Nyembwe, Didier, Kabasele, Jonathan

“…After usage, foundry chromite sand is recycled to reduce production costs and comply with environmental regulations. Thermal and mechanical reclamation are the…”
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ASSESSMENT OF LOCAL CHROMITE SAND AS ‘GREEN’ REFRACTORY RAW MATERIALS FOR SAND CASTING APPLICATIONS IN A POST-PANDEMIC WORLD by Kabasele, Jonathan, Nyembwe, Didier

“…In a post-pandemic world, health and environmental safety will become a more important issue than it was before the COVID-19 pandemic. Several fields of…”
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Characterization of Foundry Waste Sand Streams for Recycling Applications in Construction Industry by Nyembwe, J. K., Makhatha, M. E., Banganayi, F. C., Nyembwe, K.

“…The local South African foundry industry discharges large volumes of waste sand each year, with estimates for silica and chromite sands of 250,000 and 25,000…”
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Annealer curve characteristics of electrolytically refined tough pitch copper (Cu-ETP) and oxygen free up-cast copper (Cu-OF) for electrical cable wires by Banganayi, C., Nyembwe, K., Mageza, K.

“…Annealing is a critical step during the wire drawing of copper to produce wires with the required ductility and conductivity for electrical applications. In…”
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Improvement on the fabrication of SiC materials: Processing, reinforcing phase, fabricating route—A review by Oguntuyi, S.D., Nyembwe, K., Shongwe, M.B., Johnson, O.T., Adewumi, J.R., Malatji, N., Olubambi, P.A.

“…The ceaseless exploration for the improvement of ceramic materials has created a lot of techniques, all aimed at producing ceramic materials that can withstand…”
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MECHANICAL RECLAMATION OF WASTE SAND PRODUCED BY ADDITIVE MANUFACTURING PROCESSES by Motlhabane, Accolade, Nyembwe, Didier, van Tonder, Malan

“…Metal casting manufacturers are increasingly adopting three-dimensional printing in their workflows as a way to remain competitive. Despite all the innovative…”
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Assessment of Foundry Chromite Sand Crushability under Thermal-Mechanical Loading by Kabasele, J K, Nyembwe, K D, Polzin, H

“…When used for sand casting, foundry sand is stressed in several ways. These stresses, thermal and mechanical, compromise the grain integrity, resulting in size…”
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Effects of South African Silica Sand Properties on the Strength Development and Collapsibility of Single Component Sodium Silicate Binders by Banganayi F.C, Nyembwe K, Polzin H

“…This study shows the results of the investigation of the strength performance, and residual strength of a single component inorganic binder system Cast Clean…”
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OPTIMISATION OF A RESIN-COATED CHROMITE SAND FOR RAPID SAND CASTING APPLICATIONS by Tshabalala, Neo, Nyembwe, Kasongo, Van Tonder, Malan

“…Applications of three-dimensional printing (3DP) to sand casting have been well-established in the last two decades. The preferred raw material is silica…”
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PHYSICAL PROPERTIES OF SAND PARTS PRODUCED USING A VOXELJET VX1000 THREE- DIMENSIONAL PRINTER by Nyembwe, Kasongo, Mashila, Motadi, van Tonder, Petrus Jacobus Malan, de Beer, Deon J, Gonya, Elvis

“…Successful case studies of metal casting applications using sand moulds and cores produced by additive manufacturing (AM) processes have been widely reported…”
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SUITABILITY OF A SOUTH AFRICAN SILICA SAND FOR THREE-DIMENSIONAL PRINTING OF FOUNDRY MOULDS AND CORES by Nyembwe, Kasongo, Oyombo, Dady, de Beer, Deon J, Van Tonder, PJM

“…Applications of three-dimensional printing (3DP) to metal casting include, among other things, the direct manufacturing of foundry moulds and cores in…”
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Influence of Fe3O4 on redox changes during Cu dissolution from CuFeS2 in acidified ferric sulfate by NYEMBWE, Kolela J, FOSSO-KANKEU, Elvis, WAANDERS, Frans, MKANDAWIRE, Martin, NYEMBWE, Didier K, MAMBA, Bhekie B

“…Chalcopyrite (CuFeS2) leaching under oxidizing conditions is generally characterized by slow dissolution rates due to the formation of passivation layers. The…”
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ASSESSMENT OF SURFACE FINISH AND DIMENSIONAL ACCURACY OF TOOLS MANUFACTURED BY METAL CASTING IN RAPID PROTOTYPING SAND MOULDS by Nyembwe, K, De Beer, DJ, Van der Walt, JG, Bhero, S

“…In this paper, an initial assessment of the quality parameters of the surface finish and dimensional accuracy of tools made by metal casting in rapid…”
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Concurrent leaching of copper and cobalt from a copper–cobalt ore using sulfuric and organic acids by Oke, Emmanuel A., Potgieter, Herman, Mondlane, Fortune, Skosana, Noluthando P., Teimouri, Samaneh, Nyembwe, Joseph K.

“…•Higher temperatures and H₂O₂ concentrations improved Cu and Co leaching efficiencies.•Citric acid and oxalic acid increased Cu and Co leaching efficiencies…”
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