Extraction of Gold from Alkaline Gold Leaching Solution by Tertiary Amine N235 and Phosphine Oxide
Extraction of gold from alkaline gold leaching solution by N235-TRPO synergistic system was studied. The effects of the concentrations of Tri-akylphosphine oxide(TRPO)and tertiary amine(N235), the initial pH, and the concentration of gold on the extraction of gold and the extraction isotherm were inspected. The ability of extracting other metal elements by this system had been investigated. The effect of alkali concentration on stripping of gold from loaded organic phase had also been studied. The experimental results indicate that the system consisting of 10% N235, 10% TRPO gave high extraction yield for gold along with the lesser extraction of silver and copper which are needed to recover. The gold extraction was over 94%, at pH=9~10 and the stripping of gold from loaded organic phase using 0.05mol/L NaOH can reach91.43%.
Solvent extraction separation of Zn(II), Fe(II), Fe(III) and Cd(II) using tributylphosphate and CYANEX 921 in kerosene from chloride medium
Abstract In this work, the extraction of Zn(II), Fe(II), Fe(III) and Cd(II) with tributylphosphate (TBP) and commercial trioctyl phosphine oxide (CYANEX 921) in kerosene from chloride medium has been studied. Different parameters affecting the extraction of the investigated metal ions such as hydrochloric acid, hydrogen ion, extractant, metal ion concentrations and temperature investigations were carried out. The stoichiometry of the extracted metal species investigated by TBP and CYANEX 921 were found to be HZnCl 3 ·3TBP, HFeCl 4 ·2TBP, H 2 CdCl 4 ·3TBP, HZnCl 3 ·2C921, HFeCl 4 ·C921 and H 2 CdCl 4 ·3C921, respectively. The stripping of the extracted metal species by nitric, sulfuric and hydrochloric acids and distilled water were carried out. Based on the obtained results undiluted TBP was selected as a suitable extractant for the recovery of zinc from pickling solution resulting from hot dipping galvanizing bath.
Flow and Compaction During the Vacuum Assisted Resin Transfer Molding Process
The flow of an epoxy resin and compaction behavior of carbon fiber preform during vacuum- assisted resin transfer molding (VARTM) infiltration was measured using an instrumented tool. Composite panels were fabricated by the VARTM process using SAERTEX(R)2 multi-axial non- crimp carbon fiber fabric and the A.T.A.R.D. SI-ZG-5A epoxy resin. Resin pressure and preform thickness variation was measured during infiltration. The effects of the resin on the compaction behavior of the preform were measured. The local preform compaction during the infiltration is a combination of wetting and spring-back deformations. Flow front position computed by the 3DINFIL model was compared with the experimental data.