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Effect of hydrogen peroxide and lead(II) nitrate on gold cyanide leaching of Malaysian mesothermal deposit gold ore.
- Source :
- Physicochemical Problems of Mineral Processing; 2020, Vol. 56 Issue 5, p905-918, 14p
- Publication Year :
- 2020
-
Abstract
- The gold extraction from Malaysian mesothermal lode gold ore through the cyanidation method was performed. The effect of hydrogen peroxide (H<subscript>2</subscript>O<subscript>2</subscript>) and lead nitrate Pb(NO<subscript>3</subscript>)<subscript>2</subscript> were investigated on the percentage of gold recovery. The statistical analysis method using a response surface design-central composite design was applied to find the optimum condition for gold extraction. The studied parameters were NaCN concentration (300-500 ppm), H<subscript>2</subscript>O<subscript>2</subscript> concentration (205-410 ppm), and Pb(NO<subscript>3</subscript>)<subscript>2</subscript> concentration (50-150 ppm). It was found that increasing the amount of NaCN and H<subscript>2</subscript>O<subscript>2</subscript> as well as decreasing the amount of Pb(NO<subscript>3</subscript>)<subscript>2</subscript> in the studied range, increased the gold recovery. The analysis of variance suggested the linear model for the gold extraction with the optimum condition at 467.3 ppm NaCN, 94.96 ppm Pb(NO<subscript>3</subscript>)<subscript>2</subscript>, and 340 ppm H<subscript>2</subscript>O<subscript>2</subscript>. The gold extracted from the ore at the optimum condition was 88.97% as compared to 62.02% from conventional cyanidation. The characterization study of the gold ore indicated that the finely gold particles interlocked in the aluminosilicate phase (grain size of ~10.0 µm). The Van't Hoff differential method justified that the cyanidation was of second order with a specific reaction rate of 0.0501/hour. [ABSTRACT FROM AUTHOR]
Details
- Language :
- Multiple languages
- ISSN :
- 16431049
- Volume :
- 56
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Physicochemical Problems of Mineral Processing
- Publication Type :
- Academic Journal
- Accession number :
- 146215458
- Full Text :
- https://doi.org/10.37190/ppmp/126629