Electrolyte capable of recycling tin from scrapped electronic circuit board

An electronic circuit board and electrolyte technology, which is applied in the direction of photographic process, instrument, photographic auxiliary process, etc., can solve the problems of increasing processing difficulty and recycling cost, unfavorable tank liquid recycling, and slow anode dissolution speed, etc., so as to save Treatment cost, avoidance of anode passivation, effect of bath stabilization

Inactive Publication Date: 2018-02-16
广东明方科技有限公司
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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 carbo

Method used

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Embodiment Construction

[0018] The specific implementation of the present invention, such as the shape and structure of each component involved, the mutual position and connection relationship between each part, the function and working principle of each part, etc., will be further described in detail through the description of the implementation examples below.

[0019] The electrolytic solution for reclaiming tin from waste electronic circuit boards of the present invention comprises sodium hydroxide 120g / L, an activator 15g / L mixed with sodium potassium tartrate and disodium ethylenediaminetetraacetate, and a mixture of methane nitro The stabilizer of benzoic acid and sulfamic acid is 35g / L, and the anode current density is 3A / dm2. The ratio of anode to cathode is 2:1. Among them, the preferred mixing ratio of methanenitrobenzoic acid and sulfamic acid as stabilizer is 50:1, and the mixing ratio of potassium sodium tartrate and disodium edetate as activator is adjusted according to the tin density...

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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...

Claims

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Application Information

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IPC IPC(8): C25C1/14C25C7/00
CPCC25C1/14C25C7/00
Inventor 郭大彪黄立忠吴映明
Owner 广东明方科技有限公司
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