Extraction of chromium from waste for chromium oxide green production

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dc.contributor.advisor Dr. F. Ntuli; Dr. E. Muzenda en_US
dc.contributor.author Jabane-Bauwens, Oaitse Joyce
dc.date.accessioned 2012-08-02T06:39:39Z
dc.date.available 2012-08-02T06:39:39Z
dc.date.issued 2012-08-02
dc.date.submitted 2012-03-14
dc.identifier.uri http://hdl.handle.net/10210/5400
dc.description M.Tech. en_US
dc.description.abstract A study was undertaken to develop and test the process for the recovery of high purity chromium oxide green from chromium waste. The process developed has a combination of leaching, ion exchange, coagulation, chelation and calcination. Based on the research findings, strong acid cation resin (Purolite 106) and weak acid cation exchange (Lewatit NCP 80) resins were selected for extraction of aluminium Ill ions and chromium Ill ions respectively. The optimal conditions for extraction of chromium (Ill) with ion exchange resins from chromium leachate solution were established taking into account the composition and the parameters of the chromium solution, the resin manufacturer's defined operating conditions and the empirical dependencies established in previous studies on model solutions of chromium (Ill). The effects of pH, compositions and the temperature on the extraction of chromium (Ill) were also examined. The yield of chromium (Ill) from tannery chromium hydroxide solid was about 96-98% after 35 min of phase contact with the sulphuric acid solution. Chromium hydroxide with Cr20 3 content of 88% was achieved by extracting chromium (Ill) with weak acid cation resin. The ferric and calcium ions present in the treated chromium hydroxide product were then removed by soaking the hydroxide cake in 0.1 to 0.2M ethyldiaminetretraacetic (EDTA) acid solution. The final product, chromium oxide green, with a Cr20 3 content of at least 95.14% achieved with the described process. en_US
dc.language.iso en en_US
dc.subject Chromium oxide en_US
dc.subject Chromium waste en_US
dc.subject Chromium extraction
dc.title Extraction of chromium from waste for chromium oxide green production en_US
dc.type Thesis en_US

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