The method of extracting silver from cyanide solutions and slurries

 

The invention relates to hydrometallurgy, in particular coal sorption technology for the recovery of precious metals from solutions and slurries. Extraction of silver from cyanide solutions and slurries is carried out by sorption active charcoal at a concentration of cyanide ions 0,002-0,008%. The proposed method of extracting silver from cyanide solutions and slurries in comparison with existing methods provides a higher degree of extraction of silver. table 1.

The invention relates to hydrometallurgy, in particular coal sorption technology for the recovery of precious metals from solutions and slurries.

In sorption technology known method of extracting precious metals active coals from cyanide solutions and slurries at concentrations of cyanide ions 0,02-0,03% [Zelenov C. I. research Methodology the gold - and silver-bearing ores. - M.: Nedra, 1989.- 302 S.].

The disadvantage of this method of recovery of precious metals is the low degree of extraction of silver from cyanide solutions and slurries.

The closest in technical essence is a method of extracting gold and silver active coals from cyanide solutions and slurries at concentrations of ions qi is edited Tchugaev L. C. - 2nd ed., revised and enlarged extra - M.: metallurgy, 1987, 432 S.].

The disadvantage of this method is the low degree of extraction of silver.

The invention aims to obtain a technical result - increasing the degree of extraction of silver from cyanide solutions and slurries of active coals.

The technical result is achieved by the fact that in the proposed method of extracting silver from cyanide solutions and slurries of active coals, including sorption of silver active charcoal sorption was carried out at a concentration of cyanide ions 0,002-0,008%.

Conducting sorption of silver active charcoal at a concentration of cyanide ions 0,002-0,008% is the difference from the prototype and determines the compliance of the proposed method the criterion of "novelty".

In contrast to the known method of extracting silver from cyanide solutions and slurries of active coals, holding sorption of silver active charcoal at a concentration of cyanide ions 0,002-0,008% provides conditions for more complete extraction of silver. This is achieved by maintaining the concentration of cyanide ions 0,002-0,008% helps to reduce the charge of an ion cyanide complex of silver and its coordination number and, consequently, the formation of single-shot comp is rnostly active carbons are significantly higher than multiply charged complexes style silver [Ag(CN)3]2-and [Ag(CN)4]3-.

Therefore, reducing the concentration of free cyanide ions decreases the probability of formation labourbased multiply charged complexes of cyanide of silver, which helps to increase the degree of extraction of silver active coals.

When the concentration of cyanide ions in solution more than 0,008% possible existence along with a single complex multiply charged cyanide complexes of silver, which does not allow to achieve a high degree of metal extraction. A significant decrease in the concentration of cyanide ions below 0,002% leads to the decrease of resistance cyanide complex of silver, which can lead to reduced recovery of silver from cyanide solutions and slurries of active coals.

Thus, in the proposed method of extracting silver from cyanide solutions and slurries, including sorption of silver active carbons, conducting sorption at a concentration of cyanide ions 0,002-0,008% leads to the formation in solution singly charged complexes of the type [Ag(CN)2]-with higher sorption activity with surface coal compared with multiply charged complexes serebrier allows to increase the degree of extraction of silver from solutions and slurries of active charcoal. The presence of the aggregate of distinctive properties determines the compliance of the proposed solutions to the criterion of "inventive step".

An example of the Extraction of silver from cyanide solutions was performed by adsorption in static conditions at active coal grade "Futamura Chemical industry" brand TAIKO CW 612 B in Japan. Cyanide-alkaline solutions contained 15,5 mg/l silver, pH 10. The cyanide ion concentration was maintained in the range 0.001 to 0.01%, using the method of oxidation of cyanide compounds using bleach l2. The mass of a sample of coal was 0.3 g, the volume of solution 100 ml, the duration of the sorption was 48 PM

For comparison of the results of the extraction of silver from cyanide solutions according to the prototype were carried out by adsorption on active charcoal at a concentration of cyanide ions of 0.02%.

The silver content in the solutions was determined by atomic absorption spectrometry, and coal - chemical method. The results of the experiments presented in the table.

Analysis of the data presented in the table allows us to conclude that the conduct of sorption of silver from cyanide solutions active charcoal at a concentration of cyanide ions 0,008-0,002% can significantly increase the degree of extraction of silver (boli ways provides a higher degree of extraction of silver.

Claims

The method of extracting silver from cyanide solutions and slurries, including sorption active coals, characterized in that the sorption was carried out at a concentration of cyanide ions 0,002-0,008%.

 

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