Volume 3, Issue 3, September 2018, Page: 65-75
Determination of Silver by Fire Assay Gravimetry Combined with Mathmetic Correction
Sheng Jianlin, Testing Center of Zhejiang Fuye Group Co, Ltd, Fuyang, China
Sun Yin, Testing Center of Zhejiang Fuye Group Co, Ltd, Fuyang, China
Zhu Wujin, Testing Center of Zhejiang Fuye Group Co, Ltd, Fuyang, China
Zeng Zongjie, Testing Center of Zhejiang Fuye Group Co, Ltd, Fuyang, China
Ma Guoqiang, Testing Center of Zhejiang Fuye Group Co, Ltd, Fuyang, China
He Hucheng, Testing Center of Zhejiang Fuye Group Co, Ltd, Fuyang, China
He Mingdong, Testing Center of Zhejiang Fuye Group Co, Ltd, Fuyang, China
Received: Jul. 20, 2018;       Accepted: Oct. 15, 2018;       Published: Nov. 29, 2018
DOI: 10.11648/j.ijmpem.20180303.13      View  19      Downloads  20
Abstract
The fire assay gravimetry is an old and classical method. It is one of most commonly used and most effective methods for the separation and analysis of precious metals due to strong representativeness, high accuracy and good stability. However, the fire assay gravimetry also has some disadvantages such as long analytical procedure and systemic lower analytical results (especially for silver). If the second or secondary assaying is use, the analytrcal procedure will be longer and the operation cost will be higher. Through the exploration and analysis of the test principle of smelting and ash blowing in the fire test analysis, under the premise of the control test analysis conditions, according to the merging silver content and lead buckle quality of one test gold, theoretically derived The mathematical model for correcting the amount of silver loss during smelting and ash blowing, and then the method of measuring the silver by the fire test weight method combined with the mathematical correction method, can completely eliminate the operation steps of the second test. The content of silver in three representative samples (including crude copper, copper concentrate and copper anode slime) was determined by the experimental method and fire assay-recovery correction method in the experiment. In the latter method, the lost silver in residue and cupel was determined by second fire assaying to obtain the corrected ralue of silver. The results showed that the relative difference between two methods were within ± 0.5%. The relative standard deviation (RSD) of crude copper (n = 11) and copper concentrate (n = 12) with proposed method was 0.9% and 1.2%. In addition, in this article, the optimum lead button mass with various samples and assay ingredient schemes was obtained by higher mathematics derivation, and the lead button mass in national related analysis standards was reasonably and scientifically reviewed.
Keywords
Fire Assay, Gravimetry, Ingredient, Smelting, Cupellation, Lead Button Mass, Silver Loss, Mathematic Model, Correction Coefficient
To cite this article
Sheng Jianlin, Sun Yin, Zhu Wujin, Zeng Zongjie, Ma Guoqiang, He Hucheng, He Mingdong, Determination of Silver by Fire Assay Gravimetry Combined with Mathmetic Correction, International Journal of Mineral Processing and Extractive Metallurgy. Vol. 3, No. 3, 2018, pp. 65-75. doi: 10.11648/j.ijmpem.20180303.13
Copyright
Copyright © 2018 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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