Solvothermal synthesis of high value copper powder from copper bleed solution of an Indian copper smelter

Meshram, Pratima; Sinha, Manish Kumar; Sahu, Sushanta Kumar; Khan, Pritam; Pandey, Banshi Dhar; Mankhand, Tilak Raj

Solvothermal synthesis of high value copper powder from copper bleed solution of an Indian copper smelter

2013

Recovery of copper powder from copper bleed solution (CBS) of a copper smelter by solvothermal route has been investigated. After removing sulphuric acid by solvent extraction with tri-iso-octyl-amine, copper from the acid depleted CBS was recovered by using Versatic 10 acid as an extractant in kerosene. In 1.5M Versatic 10 acid 29.8g/L copper was loaded at an equilibrium pH of 4.25. During the hydrogen stripping, a 97% copper powder was recovered from the loaded Versatic 10 acid solution at 20bar hydrogen pressure and 403K temperature. The solvothermal synthesis of copper powder followed nucleation and growth kinetic model with activation energy value of 145kJ/mol. Stripping of copper powder could also follow the chemical control kinetic model with lower value of activation energy (66kJ/mol). The copper powder as characterized by SEM exhibited globular particles of 0.25–0.5μm size and was found to be suitable for P/M applications.

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