scholarly journals Gold Determination Problem in Barium Production Waste

2020 ◽  
Author(s):  
R.E. Khabibulina ◽  
K.D. Naumov, V.G. ◽  
V.G. Lobanov ◽  
V.A. Valnev
Keyword(s):  
Atomic Absorption ◽  
Raw Materials ◽  
Direct Determination ◽  
Leach Solution ◽  
Gold Content ◽  
Reliable Determination ◽  
Aqua Regia ◽  
Fire Assay ◽  
Gold Determination

The most common method for gold content determination in raw materials is fire assay. An alternative to this method is atomic absorption in a solution obtained by dissolving an initial sample in aqua regia. This study focuses on the sludge of one of the chemical plants, in which the barite concentrate (barium in sulphate form) is fused with calcium chloride at coal presence, and then leached in water. Decomposition of samples in aqua regia followed by atomic absorption analysis, as well as fire assay, showed gold content in the sludge at the level of 1-4 gram per ton. The presence of infusible and chemically resistant compounds in the sludge does not allow to the reliable determination of the gold content. Sintering with sodium peroxide for decomposition of stable compounds at 700 ∘ C, dissolution of sinter in acidic solution, evaporation and fire assay of residue made it possible to establish a reliable concentration of gold in the sludge - 10-20 gram per ton. It was found that a direct determination of gold in acidic sinter leach solution provides inadequate values associated with the influence of the background. Keywords: Gold determination, barium sludge, fire assay, atomic absorption

Atomic Absorption Determination of Lead, Bismuth, Selenium, Tellurium, Thallium and Tin in Complex Alloys Using Direct Atomization from Metal Chips in the Graphite Furnace

1977 ◽  
Vol 31 (1) ◽  
pp. 9-11 ◽  
Author(s):  
J. Y. Marks ◽  
G. G. Welcher ◽  
R. J. Spellman
Keyword(s):  
Trace Elements ◽  
Atomic Absorption ◽  
Base Alloy ◽  
Cast Alloy ◽  
Graphite Furnace ◽  
Direct Determination ◽  
Nickel Base Alloy ◽  
Metal Chips ◽  
Nickel Base

Atomic absorption spectrometry utilizing electrothermal atomization devices has proven to be the best technique available for the analysis of complex alloys for trace elements of metallurgical interest. The determination of lead, bismuth, selenium, tellurium, thallium, and tin was successfully demonstrated by direct atomization from complex, nickel-base alloy chips with commercial atomic absorption furnace equipment. The determination was carried out by first milling metal chips from the bulk sample. The sample was transferred directly to the furnace and atomized immediately with no preatomization heating cycle. A series of cast alloy standards containing the trace elements were prepared by additions to a nickel-base alloy, then subsequently analyzed by established analytical methods. Of the three commercial atomizers studied, the Perkin-Elmer model HGA 2100 proved to be the most suitable for direct determination of the trace elements of interest. The coefficient of variation of absorbance measurements varied from 7% for bismuth which is easily atomized to 25% for tin which is more difficult to atomize.

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