Dissolution behaviour of freibergite-tetrahedrite concentrate in acidic dichromate solution

G Ariunaa,G Burmaa,Sh Nyamdelger,T Narangarav

doi:10.5564/mjc.v14i0.196

Abstract

Asgat ore sample with estimated content of 431g/t silver was concentrated by using floatation method and obtained freibergite-tetrahedrite concentrate with 9050g/t Ag, 35.75% Cu, 28.5% Sb and 10.6% Fe, respectively. The dissolution of concentrate in acidic potassium dichromate solution has been investigated with respect to the sulfuric acid and potassium dichromate concentrations and by changing leaching temperature and time. Leaching freibergitetetrahedrite concentrate in dichromate acidic solution (K2Cr2O7-0.1M, H2SO4-0.4M leaching time 4h, leaching temperature 95°С) resulted total amount of leaching of 95.65 % silver, 93.85% copper, 99.86 % antimony and 30.18% iron. DOI: http://dx.doi.org/10.5564/mjc.v14i0.196 Mongolian Journal of Chemistry 14 (40), 2013, p36-40

Highlights

Asgat silver-polymetallic deposit is one of the strategic mineral deposits of Mongolia
Dissolution tests of minerals in the freibergitetetrahedrite concentrate were using by acidic potassium dichromate solutions, to determine the effect of the following parameters: potassium dichromate (K2Cr2O7) concentration (0.02M, 0.05M, 0.1M), sulfuric acid (H2SO4) concentration (0.2M, 0.3M, 0.4M), leaching temperature (400C, 800C, 950C), and leaching time (15, 30, 60, 120, 180 and 240 minutes)
Influence of acid ion and dichromate ion and concentrations: In the experiments to study the influence of sulfuric acid (H2SO4) concentration on silver, antimony, copper and iron dissolution, H2SO4 concentration was varied in the range of 0.2 - 0.4M at 950C while the K2Cr2O7 concentration was kept constant at 0.1M

Summary

Introduction

Asgat silver-polymetallic deposit is one of the strategic mineral deposits of Mongolia. The leaching behaviour of freibergitetetrahedrite concentrate from the Asgat polymetallic ore with potassium dichromate acidic solution was studied.

Results

Conclusion