Method for electrolytically separating stannum-lead alloy through low eutectic solvent

Abstract

The invention relates to a method for electrolytically separating a stannum-lead alloy through a low eutectic solvent and belongs to the technical field of ionic liquid metallurgy. Choline chloride and ethanediol are mixed in accordance with the molar ratio being 1:2 and then are subjected to heating, stirring and eutectic melting at the temperature of 80 DEG C till clear and transparent liquid is formed, and a choline chloride-ethanediol low eutectic solvent, namely 1ChC1:2EG DES for short, is synthesized; stannous chloride is added into the synthesized 1ChC1:2EG DES, stirring is conducted till even dissolution is achieved, and an electrolyte solution is prepared; the prepared electrolyte solution is heated to be 30-70 DEG C, a stannum-lead alloy block serves as a positive pole, a copper sheet serves as a negative pole, and electrolysis is conducted; and branch-shaped stannum powder is obtained on the negative pole and is slightly scraped off from the negative pole, and the stannum powder containing Sn being equal to or more than 99.95 wt% is obtained after the branch-shaped stannum powder is subjected to ultrasonic dispersion cleaning and drying. According to the electrolytically separating the stannum-lead alloy through the low eutectic solvent, the electrolyte solution is prepared by adding the moderate stannous chloride into the choline chloride-ethanediol low eutectic solvent, the steam pressure of the electrolyte solution is extremely low, the electrolyte solution is hardly volatilized, heat stability is good, an electrolyte system is environmentally friendly, and the electrolyte solution can be recycled.

Description

technical field

[0001] The invention relates to a method for electrolytically separating tin-lead alloys using a deep eutectic solvent, and belongs to the technical field of ionic liquid metallurgy. Background technique

[0002] Tin and lead belong to the elements of group IVA in the periodic table of elements, and their physical and chemical properties are relatively similar. The thermodynamic properties of the tin-lead binary system show a certain negative deviation from the ideal solution, and the behavior in the pyrometallurgical process is relatively similar, resulting in certain difficulties in the separation of tin-lead alloys. At present, the separation methods of tin-lead alloy mainly include pyrometallurgy, vacuum distillation and electrolysis.

[0003] In the published patent CN101570826A [1] In the process, multi-stage vacuum distillation is used to separate the tin-lead alloy. The raw material tin-lead alloy is subjected to three-stage vacuum distillation in a...

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