کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5144834 | 1496868 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synergistic extraction of gold from the refractory gold ore via ultrasound and chlorination-oxidation
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی (عمومی)
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
A synergistic extraction method for gold from the refractory gold ores via ultrasound and chlorination-oxidation was developed. The effects of solid-liquid ratio, extraction time, ultrasound power, NaClO concentration and NaOH concentration on the extraction rate of gold from the refractory gold ore were investigated. The optimum conditions were as follows: NaClO concentration of 1.5Â mol/L, NaOH concentration of 1.5Â mol/L, solid-liquid ratio of 5, ultrasound power of 200Â W and ultrasound time of 2Â h. Under the optimal conditions, 68.55% of gold was extracted. However, only 45.8% of gold was extracted after 6Â h without the ultrasound-assisted extraction. XRD and SEM were used to analyze the influence of ultrasound on the mineral properties and strengthening mechanism. The results showed that the interface layer was peeled, new surface was exposed, reaction resistance was reduced, the liquid-solid reaction was promoted and reaction speed was greatly improved under ultrasound. According to the results of range and variance analysis, the optimum leaching experiment with orthogonal design was almost identical with the optimum experiment of single factor. Among them, the ultrasound power was the most significant factors affecting leaching rate of gold. Compared with other extraction method, the synergistic extraction process decomposed completely sulfide and improved significantly the extraction rate of gold.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics Sonochemistry - Volume 37, July 2017, Pages 471-477
Journal: Ultrasonics Sonochemistry - Volume 37, July 2017, Pages 471-477
نویسندگان
Likang Fu, Libo Zhang, Shixing Wang, Wei Cui, Jinhui Peng,