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Author:

Zhu, Xiao-Guang (Zhu, Xiao-Guang.) | Xi, Xiao-Li (Xi, Xiao-Li.) (Scholars:席晓丽) | Nie, Zuo-Ren (Nie, Zuo-Ren.) (Scholars:聂祚仁) | Ma, Li-Wen (Ma, Li-Wen.) | Zhu, Jian-Jian (Zhu, Jian-Jian.)

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Abstract:

The sponge gold was obtained by using 'breaking-removing low priced metal with sulfuric acid oxidation method-leaching gold-extracting gold with methyl isobutyl ketone (MIBK)-stripping gold' process. The statistical methods were used to analyze the impact of different factors on the extraction of Au (III) using MIBK as extractant. The factorial designs with five factors and two levels were firstly used to evaluate the relative effects that might affect the extraction of gold from the waste printed circuit board with MIBK. The results show that the factors including the phase ratio of organic and aqueous, the reaction time and the temperature, have significant impacts on the extraction rate of gold. The phase ratio and reaction time have positive impacts on the gold extraction, while temperature has negative impact. Based on this, Box-Behnken central composite design combining with response surface methodology (RSM) was employed to optimize the most important affecting factors of the extraction rate. The optimum conditions for the extraction are the organic and aqueous phase ratio of 0.34, reaction time of 12.4 min and temperature of 28°C, which are calculated from an established quadratic equation of one variable regression model. Under the optimized conditions, the gold extraction rate can reach as high as 96.1%. At last, the organic phase is stripped with solution of oxalic acid (5%) to get sponge gold.

Keyword:

Extraction Timing circuits Gold compounds Ketones Gold Surface properties Printed circuit design Regression analysis Oxalic acid Printed circuit boards

Author Community:

  • [ 1 ] [Zhu, Xiao-Guang]College of Material Science and Engineering, Beijing University of Technology, Beijing 100124, China
  • [ 2 ] [Xi, Xiao-Li]College of Material Science and Engineering, Beijing University of Technology, Beijing 100124, China
  • [ 3 ] [Nie, Zuo-Ren]College of Material Science and Engineering, Beijing University of Technology, Beijing 100124, China
  • [ 4 ] [Ma, Li-Wen]College of Material Science and Engineering, Beijing University of Technology, Beijing 100124, China
  • [ 5 ] [Zhu, Jian-Jian]College of Material Science and Engineering, Beijing University of Technology, Beijing 100124, China

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Source :

Chinese Journal of Nonferrous Metals

ISSN: 1004-0609

Year: 2013

Issue: 6

Volume: 23

Page: 1739-1745

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 4

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