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Method utilizing nitric acid type solder stripping waste water to synthetize zinc hexahydroxystannate

A technology for zinc hydroxystannate and tin stripping wastewater, which is applied in the fields of tin compounds, chemical instruments and methods, water/sewage treatment, etc., and achieves the effect that the process conditions are not harsh and easy to operate

Inactive Publication Date: 2012-06-27
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for synthesizing zinc hexahydroxystannate by utilizing nitric acid type tin stripping waste water, and synthesize the tin stripping waste water produced by printed circuit board enterprises through a simple, environmentally friendly and low energy consumption method. The product of zinc hexahydroxystannate, a plastic flame retardant, solves the current problem of tin stripping wastewater treatment in printed circuit board enterprises

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 50mL (about 67g) of tin stripping waste liquid and pour it into a beaker, put 2 grams of sodium sulfate into the beaker first, and then add 10mL of polyacrylamide sedimentation aid solution with a mass concentration of 0.2% after the electrolyte is dissolved, and turn on the magnetic force at the same time Stirring, the stirring rate is 200 rpm, stop stirring when the solution forms a flocculation, filter immediately, and recover the obtained wet mud; put the recovered wet mud into the reaction kettle, add hydrochloric acid with a mass concentration of 37% or more Solution 30mL, magnetic stirring at the same time, the stirring rate is 200 rpm, adjust the temperature of the constant temperature oil bath at 90 ° C, the reaction time is 180 minutes; after the reaction is cooled to 80 ° C, add 0.50 g of zinc acetate to the reaction kettle, Use sodium hydroxide solution to adjust the pH of the solution to 10, adjust the temperature of the constant temperature oil bath to...

Embodiment 2

[0026] Take 100mL (about 134g) of tin stripping waste liquid and pour it into a beaker, first put 4 grams of sodium nitrate into the beaker, and after the electrolyte is dissolved, add 20mL of a solution of polymeric ferric sulfate aluminum chloride with a mass concentration of 1%. At the same time, turn on the magnetic stirring, and the stirring rate is 200 rpm. When the solution forms a flocculated shape, stop stirring, filter immediately, and reclaim the obtained wet mud; put the recovered wet mud into the reaction kettle, and add a mass concentration of 37% The above hydrochloric acid solution is 50mL, and magnetically stirred at the same time, the stirring rate is 200 rpm, the temperature of the constant temperature oil bath is adjusted at 100°C, and the reaction time is 180 minutes; after the reaction is cooled to 80°C, add 1.00 grams of For zinc acetate, use ammonia solution to adjust the pH of the solution to 10, adjust the temperature of the constant temperature oil ba...

Embodiment 3

[0028] Take a volume of 100mL (about 134g) of tin stripping waste liquid and pour it into a beaker, first put 4 grams of sodium chloride into the beaker, and after the electrolyte is dissolved, add 10mL of a solution of 1% polymeric ferric sulfate aluminum chloride as a sedimentation aid solution , turn on the magnetic stirring at the same time, the stirring rate is 200 rpm, stop stirring when the solution forms a flocculated shape, filter immediately, and reclaim the obtained wet mud; put the recovered wet mud into the reactor, and add a mass concentration of 37 % hydrochloric acid solution above 60mL, magnetic stirring at the same time, the stirring rate is 200 rpm, the temperature of the constant temperature oil bath is adjusted at 100°C, and the reaction time is 150 minutes; when the reaction is completed and cooled to 80°C, add 1.00g zinc sulfate, adjust the pH of the solution with ammonia solution to be equal to 10, adjust the temperature of the constant temperature oil b...

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Abstract

The invention discloses a method utilizing nitric acid type solder stripping waste water to synthetize zinc hexahydroxystannate, which comprises the following steps that: (1) strong electrolyte and settling agent are added in the nitric acid type solder stripping waste water, so the tin compound in the waste water is precipitated, and then the tin sludge is obtained through filtration; (2) the obtained tin sludge is reacted with the concentrated hydrochloric acid to make the tin sludge convert into the tin ionic condition; (3) the tin ion which is in the ionic condition is reacted with the zinc salt under a certain condition to synthetize the zinc hexahydroxystannate compound; (4) the solution is cooled to the room temperature after the reaction is completed, the supernatant liquor is removed through centrifugal separtion, so the obtained material is cleaned via the distilled water; and (5) after the cleaning, the final zinc hexahydroxystannate is obtained through filtration and drying at intermediate temperature. No harmful substances to the environment are generated during the whole synthetization process, and the obtained material is the synthetic material of an environment-friendly plastic fire retardant, a smoke inhibitor and a sensor. The purposes of resource cyclic utilization, low emission and green and environmental-friendly production are realized.

Description

technical field [0001] The invention belongs to the field of waste water treatment in the process of manufacturing printed circuit boards, and synthesizes the tin stripping waste water discharged in the process of manufacturing printed circuit boards into a product of zinc hexahydroxystannate. Background technique [0002] In the manufacturing process of multilayer printed circuit boards, the tin stripping process is an essential process, and the purpose of tin stripping is to expose the protected lines. There are many kinds of tin stripping solutions, including the tin stripping principle of the nitric acid type tin stripping solution system is to achieve the purpose of tin stripping through the reaction of concentrated nitric acid and tin. Therefore, as the tin stripping process continues, the concentration of tin in the system will also continue to increase. When the tin concentration in the system reaches a certain concentration, if the new solution is not replaced in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/00C02F1/62
Inventor 肖应东张俊峰陈世荣罗小虎高品华
Owner GUANGDONG UNIV OF TECH
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