System and method for recycling tin from tin-stripping waste liquid and circularly preparing novel tin-stripping liquid

A technology of waste liquid recovery and electrical control system, applied in the direction of improving process efficiency, etc., can solve the problems of complex combination process, easy loss of electrodes, high maintenance cost, and achieve the effects of high tin dissolution rate, low corrosion and simple method.

Active Publication Date: 2013-07-31
上海毅蓝电子科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The combination process of high temperature and electrolysis method is complex, high energy consumption, the electrode is easy to wear out during use, and the cost of equipment maintenance is high

Method used

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  • System and method for recycling tin from tin-stripping waste liquid and circularly preparing novel tin-stripping liquid
  • System and method for recycling tin from tin-stripping waste liquid and circularly preparing novel tin-stripping liquid

Examples

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Effect test

specific Embodiment example 1

[0037] The tin-removing waste liquid from a circuit board factory in Jiangsu has been determined to contain 15% nitric acid, 150g / L tin, 2.1g / L copper, and a specific gravity of 1.35. Take 1L of waste liquid, pass it through steam for hydrolysis and air flotation for 20 minutes, and centrifuge After separation for 3 minutes, 900ml of clear liquid was obtained, containing 0.5g / L tin and 1.5g / L copper. Add 40ml of 68% nitric acid, 3ml of wetting acceleration additive A, 2ml of copper-protecting additive B, and 2ml of stability and precipitation inhibitory additive C, and stir thoroughly for 30 minutes to obtain 945ml of liquid with a specific gravity of 1.21. Using the soaking method to remove tin, the temperature of the regenerated tin stripping water is controlled at 30°C, the rate of tin stripping reaches 12u / min, and the stripping rate reaches 2.8m 2 The performance of tin plate meets the standard of fresh tin stripping water, and at the same time, it realizes the complete r...

specific Embodiment example 2

[0039] The tin-removing waste liquid from a circuit board factory in Shanghai has been determined to contain 13.8% nitric acid, 78g / L tin, 7.6g / L copper, and 10g / L iron. Float and separate for 25 minutes, and centrifuge for 5 minutes to obtain 920ml of clear liquid containing 0.6g / L tin and 3.2g / L copper. Add 30ml of 68% nitric acid, 3ml of wetting acceleration additive A, 2ml of copper-protecting additive B, and 2ml of stabilization and precipitation inhibitory additive C, and stir thoroughly for 30 minutes to obtain 955ml of liquid with a specific gravity of 1.23. Using the soaking method to remove tin, the temperature of the regenerated tin stripping water is controlled at 30°C, the rate of tin stripping reaches 11.8u / min, and the stripping rate reaches 2.9m 2 The performance of tin plate meets the standard of fresh tin stripping water, and at the same time, it realizes the complete recycling and reuse of tin stripping waste liquid.

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Abstract

The invention discloses a system and a method for recycling tin from a tin-stripping waste liquid and circularly preparing novel tin-stripping liquid. The system comprises a tin-stripping waste liquid barrel, a reaction tank, a centrifugal machine, a desorption tower, a mixing barrel and a liquid storage barrel which are sequentially connected through pipes; the system also comprises an electrical control system which controls a pump to pump the tin-stripping waste liquid to the reaction tank from the tin-stripping waste liquid barrel; the reaction tank is provided with a steam pipe; the tin-stripping liquid is heated by introducing steam to the reaction tank through the steam pipe so as to make tin compounds fully precipitated; at the same time, volatile nitric acid steam is recycled to a liquid barrel through the desorption tower; the tin-containing precipitate is centrifuged by the centrifugal machine to separate stannic oxide and a clear liquid; the clear liquid is conveyed to the liquid barrel; nitric acid, an infiltrated acceleration additive, a copper-protecting additive and a stable and precipitate-inhibiting agent are complementally added in the liquid barrel; and a mixed tin-stripping regenerated liquid is conveyed to the storage barrel. The method can not only separate metal cations of the tin by a physical heating hydrolysis and steam air flotation principle, is simple in method and low in energy consumption, prevents addition of external chemical substances and prevents component pollution to the regenerated novel tin-stripping liquid.

Description

technical field [0001] The invention relates to a system for stripping waste liquid of circuit boards and a treatment method thereof, in particular to a system for recovering tin from the waste tin stripping liquid and circularly preparing new tin stripping water and a treatment method thereof. Background technique [0002] The tin stripping process is an important link in the production of double-sided and multi-layer circuit boards. It is a process in which the tin layer protecting the copper surface is stripped with tin stripping water to obtain high-precision line width and line spacing. The tin stripping water that is widely used at present is a nitric acid liquid with additives such as ferric nitrate, nitric acid stabilizer, and copper protecting agent. When the tin content in the tin stripping water reaches a certain concentration, the tin stripping ability decreases, and it is discharged from the tin stripping equipment to form a tin stripping waste liquid. The tin ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/46C23F1/30C22B7/00C22B25/00
CPCY02P10/20
Inventor 谢光焰王赛郭益来
Owner 上海毅蓝电子科技有限公司
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