| Annotation |
Productive solutions obtained after leaching of ores have a complex composition,
including a variety of non-ferrous and heavy metal cations. The method of extracting
nickel from productive solutions after leaching of sulfide and lateritic ores is the most
important process in hydrometallurgical processing. Sorption by ion-exchange resins
is an alternative to existing technologies for nickel recovery from productive solutions.
The ability to selectively extract nickel and regenerate makes polymeric ion-exchange
resins one of the most popular sorbents in the modern world. The polymer resin sorption
process avoids wastage of reagents, costly filtration, and poor nickel selectivity
compared to other metal ions associated with solvent extraction processes. In order
to conduct experimental studies of sorption using Amberlite IRC 748 polymer resin, it
is necessary to calculate and design an adsorber. The objectives of the study include
the determination of the geometric parameters of the adsorber, the parameters of
the sorption/desorption process and the development of a process flow diagram. As
a result of the research, an enlarged adsorber has been designed to extract nickel
from the productive solution after bacterial-chemical oxidation of cobalt-copper-nickel
sulfide ore, and a process flow diagram for the process of obtaining nickel salts from
the productive solution has been developed. The volume of the adsorber, its height,
diameter, diameter of the inlet fitting, the height of the sorbent layer, the required
resin flow rate, and the duration of the process before regeneration are determined.
To ensure the continuity of the process, taking into account the duration of bacterialchemical
oxidation, periodic regeneration of the sorbent, the number of adsorbers in
a common installation is taken to be two. When the adsorption stage occurs in one of
the apparatuses, the stage of regeneration and drying of the polymer resin proceeds
in the other. The estimated sorption capacity of Amberlite IRC 748 resin was taken as
21.6 g of nickel per 0.1 kg of adsorbent. Resin desorption has been supposed to be
carried out with a 10 % sulfuric acid solution, at a flow rate of 5 l/h. |
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