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Method and system for recovering nitric acid and copper sulfate from deplating waste liquid

A technology for stripping waste liquid and copper sulfate, applied in copper sulfate, nitric acid, nitrogen oxides/oxyacids, etc., can solve problems such as environmental pollution and waste of resources, achieve zero discharge, realize discharge, and improve reuse value Effect

Pending Publication Date: 2021-10-19
庄仓宏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Directly neutralizing and discharging the waste deplating solution will not only seriously pollute the environment, but also cause waste of resources. Therefore, it is necessary to provide a method that can achieve zero discharge, reduce energy consumption, and maximize the reuse of resources in the process of treating the waste deplating solution. The method of transformation is very necessary

Method used

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  • Method and system for recovering nitric acid and copper sulfate from deplating waste liquid
  • Method and system for recovering nitric acid and copper sulfate from deplating waste liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Get 2L of stripping waste solution in the present embodiment and carry out the experiment of reclaiming nitric acid and copper sulfate, and its concrete steps are as follows:

[0063] (1) Put the stripping waste liquid of 1L in the 2L distillation bottle, place the distillation bottle on the magnetic heating stirrer, add 98wt% concentrated sulfuric acid to it while stirring, ensure that the mole number of sulfuric acid in the solution is the copper ion mole 2 times the number, stir and mix for 30 minutes, the temperature of the mixture rises to 58 ° C, heat distillation, nitric acid is vaporized and condensed at 10 ° C, the concentration of the nitric acid condensate is adjusted to 45%, and then sent to the retreat Plating section, collecting residual liquid;

[0064] (2) Cooling the distilled raffinate in step (1) for 2 hours at 10° C., stirring and crystallizing to separate out copper sulfate crystals, and then separating the mother liquor through solid-liquid separat...

Embodiment 2

[0068] Get 2L of stripping waste solution in the present embodiment and carry out the experiment of reclaiming nitric acid and copper sulfate, and its concrete steps are as follows:

[0069] (1) Put the stripping waste liquid of 1L in the 2L distillation bottle, place the distillation bottle on the magnetic heating stirrer, add 98wt% concentrated sulfuric acid to it while stirring, ensure that the mole number of sulfuric acid in the solution is the copper ion mole 1.8 times the number, stir and mix for 25 minutes, the temperature of the mixed liquid rises to 55°C, heats up to 115°C for distillation, condenses at 15°C after the nitric acid is vaporized, adjusts the concentration of the nitric acid condensate to 40%, and then sends Enter the deplating section to collect the residual liquid after distillation;

[0070] (2) cooling the distilled raffinate in step (1) for 3 h at 15° C., stirring and crystallizing, and separating out copper sulfate crystals, and then separating the ...

Embodiment 3

[0074] Get 2L of stripping waste solution in the present embodiment and carry out the experiment of reclaiming nitric acid and copper sulfate, and its concrete steps are as follows:

[0075] (1) Put the stripping waste liquid of 1L in the 2L distillation bottle, place the distillation bottle on the magnetic heating stirrer, add 98wt% concentrated sulfuric acid to it while stirring, ensure that the mole number of sulfuric acid in the solution is the copper ion mole 1.6 times the number, stir and mix for 35 minutes, the temperature of the mixed liquid rises to 60 ° C, heat distillation, nitric acid is vaporized and condensed at 18 ° C, the concentration of the nitric acid condensate is adjusted, the mass fraction of nitric acid reaches 50%, and then sent to the retreat Plating section, collecting residual liquid;

[0076] (2) Cooling the distilled raffinate in step (1) for 2 hours at 10° C., stirring and crystallizing to separate out copper sulfate crystals, and then separating ...

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Abstract

The invention provides a method and system for recovering nitric acid and copper sulfate from deplating waste liquid, and the method comprises the following steps: mixing the circuit board deplating waste liquid with concentrated sulfuric acid, distilling to obtain nitric acid and distillation residual liquid, cooling and crystallizing the distillation residual liquid to obtain copper sulfate crystals, and recovering the copper sulfate crystals. According to the method and the system for recovering nitric acid and copper sulfate from the deplating waste liquid provided by the invention, additional concentrated sulfuric acid is supplemented according to the amount of sulfuric acid consumed for converting copper ions into copper sulfate in the system so as to maintain the balance of the sulfuric acid concentration in the system, and the nitric acid and the copper ions in the deplating waste liquid are subjected to resource recycling; and corresponding products are obtained, the resource utilization rate is high, the nitric acid recycling value is improved, the whole system is in closed circulation, and zero emission can be achieved.

Description

technical field [0001] The invention belongs to the technical field of waste liquid treatment in the circuit board manufacturing process, and relates to the treatment of circuit board deplating waste liquid, in particular to a method and system for recovering nitric acid and copper sulfate from circuit board deplating waste liquid. Background technique [0002] Along with the electroplating process of the circuit board, the hanger as the support of the plated parts is also plated with various metal coatings. For example, the ABS plastic plating is mainly three layers of copper / nickel / chrome. Because the hanger will be used repeatedly, the plating layer on the hanger must be completely removed when a batch of plated pieces are plated and the next batch of plated pieces are electroplated, otherwise the plating solution will be polluted. Electrochemical methods are usually used to remove the coating, that is, some base metals are used for anodic passivation in alkaline solution...

Claims

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Application Information

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IPC IPC(8): C01G3/10C01B21/46C01B21/42
CPCC01G3/10C01B21/46C01B21/42C01P2006/80
Inventor 庄仓宏
Owner 庄仓宏
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