Search Results - "Maree, J.P."

Synthesis of high-purity precipitated calcium carbonate during the process of recovery of elemental sulphur from gypsum waste by de Beer, M., Doucet, F.J., Maree, J.P., Liebenberg, L.

“…•Elemental sulphur and calcium carbonate can be produced from gypsum wastes.•Calcium sulphide is an intermediate chemical species in the process.•We examined…”
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On multi-objective economic predictive control for cyclic process operation by Maree, J.P., Imsland, L.

“…•Propose a multi-criterion optimization framework for processes optimally operated cyclically.•Optimality for multi-objective optimization is discussed in the…”
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Neutralisation treatment of AMD at affordable cost by Mpholoane, D., Maree, J.P., Daniels, N., Bologo, V., M Mujuru, M.

“…Acid mine drainage (AMD) has for many years been a major environmental challenge associated with the mining industry, especially in the Eastern, Central and…”
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Thermochemical reduction of pelletized gypsum mixed with carbonaceous reductants by Motaung, S.R., Zvimba, J.N., Motaung, S.R., Maree, J.P., Kolesnikov, A.V.

“…The recovery of better quality waste gypsum during acid mine drainage (AMD) neutralization is one step closer to achieving downstream waste gypsum…”
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Challenges and avenues for acid mine drainage treatment, beneficiation, and valorisation in circular economy: A review by Masindi, V., Foteinis, S., Renforth, P., Ndiritu, J., Maree, J.P., Tekere, M., Chatzisymeon, E.

“…Mining activities are notorious for their environmental impact, with acid mine drainage (AMD) being among the most significant issues. Specifically, AMD has…”
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Effective removal of arsenate from wastewater using aluminium enriched ferric oxide-hydroxide recovered from authentic acid mine drainage by Muedi, K.L., Brink, H.G., Masindi, V., Maree, J.P.

“…This study explored an eco-friendly approach for the synthesis of novel aluminium enriched ferric oxide-hydroxide (Fe/AlO(OH)) from authentic acid mine…”
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Beneficiation of acid mine drainage (AMD): A viable option for the synthesis of goethite, hematite, magnetite, and gypsum – Gearing towards a circular economy concept by Akinwekomi, V., Maree, J.P., Masindi, V., Zvinowanda, C., Osman, M.S., Foteinis, S., Mpenyana-Monyatsi, L., Chatzisymeon, E.

“…[Display omitted] •Acid Mine Drainage (AMD) was used as a source of Fe (III) and (II).•Goethite, hematite and magnetite were synthesized from AMD genesis Fe…”
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Synthesis of magnetite from iron-rich mine water using sodium carbonate by Akinwekomi, V., Maree, J.P., Zvinowanda, C., Masindi, V.

“…[Display omitted] •Sodium Carbonate was successfully used for AMD treatment.•Sodium Carbonate was successfully used for magnetite synthesis.•Magnetite with…”
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Comparison of mine water neutralisation efficiencies of different alkaline generating agents by Masindi, V., Akinwekomi, V., Maree, J.P., Muedi, K.L.

“…•Acid mine drainage (AMD) was successfully neutralised using different alkaline generating reagents.•Efficiencies of different neutralising agents were…”
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On convergence of the unscented Kalman-Bucy filter using contraction theory by Maree, J.P., Imsland, L., Jouffroy, J.

“…Contraction theory entails a theoretical framework in which convergence of a nonlinear system can be analysed differentially in an appropriate contraction…”
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Treatment of sulphate wastewater by freeze desalination by Zikalala, N., Maree, J.P., Zvinowanda, C., Akinwekomi, V., Mtombeni, T., Mpenyana-Monyatsi, L.

“…Cooling and freezing can be used to produce fresh water from brackish water, industrial brines and leachates from industrial wastes. The aim of this study was…”
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Conversion of calcium sulphide to calcium carbonate during the process of recovery of elemental sulphur from gypsum waste by de Beer, M., Maree, J.P., Liebenberg, L., Doucet, F.J.

“…•Elemental sulphur and calcium carbonate can be produced from gypsum wastes.•Calcium sulphide is an intermediate chemical species in the process.•We examined…”
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Chemical phosphate removal from Hartbeespoort Dam water, South Africa by Atta, K.P.T, Maree, J.P, Onyango, M.S, Mpenyana-Monyatsi, L, Mujuru, M

“…Phosphate is one of the major nutrients contributing to the increased eutrophication of lakes and natural waters. The feed water to the Hartbeespoort Dam…”
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Evaluation of the performance of a new freeze desalination technology by Mtombeni, T, Maree, J.P, Zvinowanda, C.M, Asante, J.K.O, Oosthuizen, F.S, Louw, W.J

“…The use of desalination technologies which produce concentrated brines is acutely limited by inadequate waste brine disposal mechanisms such that the brine…”
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Application of magnesium hydroxide and barium hydroxide for the removal of metals and sulphate from mine water by Bologo, V., Maree, J.P., Carlsson, F.

“…The proposed magnesium-barium-oxide process consists of metal removal with Mg(OH)2, magnesium and sulphate removal with Ba(OH)2 and calcium removal with CO2…”
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The gypsum reduction process and its validation using the Mintek Pyrosim model by Tewo, R. K., Maree, J. P., Ruto, S., Rutto, H. L., Koech, L. K.

“…Waste gypsum is produced as a by-product from the fertilizer, mining industries, and acid mine water neutralization using calcium carbonate and/or lime and…”
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Acid mine water neutralisation with ammonium hydroxide and desalination with barium hydroxide by Maila, MD, Maree, JP, Cele, LM

“…In South Africa, acid mine drainage is polluting increasingly scarce ground- and surface water. The ammonium-barium (NB) process described in this paper…”
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Investigation of carbonate dissolution for the separation of magnesium hydroxide and calcium sulphate in a magnesium hydroxide-calcium sulphate mixed sludge by Rukuni, T.T., Carlsson, F.H.H., Maree, J.P.

“…South Africa is experiencing a large environmental problem due to uncontrolled discharge of acid mine water into public water courses. The need for…”
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Performance comparison of hydraulic and gravitation HybridICE filters in freeze desalination of mine waters by Maree, J.P., Adeniyi, A., Popoola, A.P.I., Zvinowanda, C.M., Mbaya, R.K.K.

“…HybridICE is an emerging freeze desalination technology for treating complex mine wastewaters. The technology works on the principle that growing ice crystals…”
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Recovery of sulphur and calcium carbonate from waste gypsum by Maree, J.P., Oosthuizen, S., Nengovhela, N.R., Theron, D.J., Strydom, C.A.

“…Gypsum is produced as a waste product by various industries, e.g. the fertiliser industry, the mining industry and power stations. Gypsum waste disposal sites…”
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