Electrolyte capable of recycling tin from scrapped electronic circuit board

Abstract

The invention aims at providing an electrolyte capable of recycling tin from a scrapped electronic circuit board. An anode can be activated in the electrolytic reaction, the bath solution stability isimproved, the deposition speed is improved, the tin can be recycled for forming a board, the recycling efficiency is greatly improved, and the recycling cost is reduced. The electrolyte comprises 80to 135g / L of sodium hydroxide, 10 to 25g / L of an activating agent obtained through mixing of seignette salt and ethylene diamine tetraacetic acid, 30 to 40g / L of a stabilizing agent formed through mixing of methane nitrobenzoic acid and sulfamic acid, and he anode current density ranges from 2.5 A / dm<2> to 6.5 A / dm<2>.

Description

technical field [0001] The invention belongs to the technical process of metal recovery in electronic products, and in particular relates to an electrolyte for recovering tin from waste electronic circuit boards. Background technique [0002] The current electrolytic recovery of tin from waste electronic circuit boards generally includes acid leaching and alkaline leaching. The alkaline leaching method uses alkaline sodium hydroxide as a complexing agent for tin. However, in this traditional process, during the electrolysis reaction, the dissolution rate of the anode is slow, and the bath solution is unstable, and the bath solution will produce divalent tin and sodium hydroxide to be hydrolyzed into sodium carbonate, thereby causing the tin deposition to be spongy. The spongy recycled tin still needs to be processed into tin ingots, which increases the processing difficulty and recycling cost, and the spongy recycled tin is not conducive to the recycling of the bath solutio...

AI Technical Summary

Problems solved by technology

However, in this traditional process, during the electrolysis reaction, the dissolution rate of the anode is slow, and the bath solution is unstable, and the bath solution will produce divalent tin and sodium hydroxide to be hydrolyzed into sodium carbonate, resulting in a spongy tin deposit.

Sponge-like recovered tin still needs to be processed into tin ingots, which increases the difficulty of processing and recycling costs, and the spongy recovered tin is not conducive to the recycling of bath liquid