Abstract
Copper (Cu) has been recovered from speiss generated from top submerged lance furnace process, but it was reported that the leaching efficiency of Cu in sulfuric acid solution decreased with increasing antimony (Sb) content in the speiss. Scanning electron microscopy (SEM)–energy-dispersive X-ray spectroscopy (EDS) results indicate that Sb exists as CuSb alloy, which would retard the leaching of Cu. Therefore, hydrochloric acid leaching with aeration was performed to investigate the leaching behaviors of copper and antimony. The leaching efficiency of Cu increased with increasing agitation speed, temperature, HCl concentration, and the introduction ratio of O2, but also with decreasing pulp density. The leaching efficiency of Cu increased to more than 99% within 60 min in 1 mol/L HCl solution at 600 rpm and 90 °C with 10 g/L pulp density and 1000 cc/min O2. The leaching efficiency of Sb increased and then decreased in all 1 mol/L HCl leaching tests, and precipitate was observed in the leach solution, which was determined to be SbOCl or Sb2O3 by XRD analyses. However, in 2 mol/L–5 mol/L HCl solutions, the leaching efficiency of Sb increased to more than 95% (about 900 mg/L) and remained, so more than 2 mol/L HCl could stabilize Sb ion in the HCl solution.
Highlights
Top submerged lance (TSL) technology has been used to recover valuable metals from the by-product of zinc smelting or industrial waste [1,2,3]
These results indicate that cuprous ion (Cu) was leached from the outer of particle, but Cu remained but Cu remained inside thenet
Scanning electron microscopy (SEM)-energy-dispersive X-ray spectroscopy (EDS) analysis of the leaching residue obtained from H2 SO4 leaching of speiss and HCl leaching of speiss was of performed to enhance leaching efficiency of Cu and investigate analysis the leaching residue the obtained from
Summary
Top submerged lance (TSL) technology has been used to recover valuable metals from the by-product of zinc smelting or industrial waste [1,2,3]. Cu component is leached with sulfuric acid, and so the precious metals are concentrated in leach residue Sb on the sulfuric acid leaching of the speiss, and hydrochloric acid there have been few reports regarding Sb leaching, and the effect of Sb on the Cu leaching has not tests with oxygen were performed to enhance the Cu leaching efficiency from the speiss The effects factorsstudy, such as temperature, agitation concentration, pulpSEM-EDS density, to ,ofinleaching the present the leach residue of thespeed, speissHCl was examined with and the flow rate of O on the leaching behaviors of Cu and Sb were investigated in hydrochloric understand the effect of 2Sb on the sulfuric acid leaching of the speiss, and hydrochloric acid acid solution.
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