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System and process for recovering heavy metals from plating bath aging solution

A technology for aging liquid and heavy metals, applied in refrigeration and liquefaction, refrigerators, zinc sulfate, etc., can solve the problems of high energy consumption in evaporation and concentration, low extraction efficiency, etc., and achieve energy saving in heating and cooling methods, reduced labor costs, and compact equipment Effect

Pending Publication Date: 2022-07-01
XIAMEN LEEBAM MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this technology are: firstly, the extraction agent needs to be regenerated before it can be put into use again; secondly, the energy consumption of evaporation and concentration is larger than that of the technology of cooling and precipitation of crystal water; and according to the solubility of the following three substances in the "Handbook of Practical Chemistry", As shown in the following table:
The content of heavy metal ions in the raffinate is higher, and the extraction efficiency is lower than 95%

Method used

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  • System and process for recovering heavy metals from plating bath aging solution
  • System and process for recovering heavy metals from plating bath aging solution
  • System and process for recovering heavy metals from plating bath aging solution

Examples

Experimental program
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Effect test

Embodiment 1

[0039] like figure 1 As shown, this embodiment discloses a system for recovering heavy metals from an aging solution of a plating tank, which includes an extractant addition unit 1 , an extraction unit 2 , a back-extraction unit 3 , a regeneration extractant unit 4 and a heat pump unit 5 . The extractant adding unit 1 includes a kerosene tank 11 , a kerosene pump 12 and a check valve 13 which are connected by pipelines in sequence. The heavy phase inlet 201 of the extraction unit 2 is connected to the plating tank aging solution discharge pipe 101 , and the light phase inlet 203 is connected to the extraction agent addition unit 1 . The heat pump unit 5 includes a heat exchange condenser 51 and a heat exchange evaporator 52 . The tube side fluid inlet of the heat exchange condenser 51 is connected with the light phase outlet 204 of the extraction unit 2 , and the tube side fluid outlet is connected with the light phase inlet 303 of the stripping unit 3 . The heavy-phase inle...

Embodiment 2

[0050] like figure 2 As shown, the only difference between this embodiment and the first embodiment is that a forced circulation pump 50 is connected in parallel between the tube-side fluid inlet and the tube-side fluid outlet of the heat exchange evaporator 52 . The function of the forced circulation pump 50 is to prevent the solution in the evaporative heat exchanger 52 from crystallizing due to a drop in temperature, resulting in poor heat exchange effect or even pipeline blockage. The rest of the structure and principle of this embodiment are the same as those of the first embodiment.

Embodiment 3

[0052] like image 3 As shown, the only difference between this embodiment and the first embodiment is that the heat pump unit 5 includes a heat exchange evaporator 52 , a refrigerant compressor 53 , a throttle valve 54 and an air-cooled condenser 57 . One end of the throttle valve 54 is connected to the air-cooled condenser 57 , and the other end is connected to the shell side fluid inlet of the heat exchange evaporator 52 . The refrigerant high-pressure outlet of the refrigerant compressor 53 is connected to the air-cooled condenser 57 , and the refrigerant low-pressure inlet is connected to the shell-side fluid outlet of the heat exchange evaporator 52 . The rest of the structure of this embodiment is the same as that of the first embodiment.

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Abstract

The invention discloses a system for recovering heavy metals from a plating tank aging solution. The system comprises an extraction agent adding unit, an extraction unit, a back extraction unit, a regeneration extraction agent unit and a heat pump unit. A heavy phase inlet of the extraction unit is connected with a plating bath aging liquid discharge pipe, and a light phase inlet is connected with the extraction agent adding unit. The heat pump unit comprises a heat exchange evaporator and an air-cooled condenser used for releasing heat. A heavy phase inlet of the back extraction unit is connected with a strong acid adding pipe, a heavy phase outlet is connected with a tube pass inlet of the heat exchange evaporator, and a light phase outlet is connected with a light phase inlet pipeline of the regeneration extraction agent unit. A heavy-phase inlet of the extractant regeneration unit is connected with a strong alkali adding pipe, and a light-phase inlet of the extractant regeneration unit is connected with a light-phase outlet of the back-extraction unit. The invention also discloses a process for recovering heavy metals from the aging solution of the plating tank by adopting the system. According to the invention, copper sulfate crystals, nickel sulfate crystals, zinc sulfate crystals and cobaltous sulfate crystals in the plating bath aging solution can be conveniently recovered, and the system is compact in structure.

Description

technical field [0001] The invention relates to the technical field of recovering heavy metal compounds from an aging solution of a plating tank, in particular to a system and a process for recovering heavy metals from an aging solution of a plating tank. Background technique [0002] In the prior art, the combined technology of recovering heavy metal compounds containing crystal water in the plating tank aging solution is realized by the technology of extraction-back-extraction combined with evaporative concentration and crystallization. The disadvantages of this technology are: firstly, the extractant needs to be regenerated before it can be put into use again; secondly, the energy consumption of evaporation and concentration is larger than that of cooling and cooling to precipitate crystal water; The following table: [0003] [0004] This solubility decreases very significantly with decreasing temperature. Therefore, it is possible to save energy and use the method ...

Claims

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Application Information

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IPC IPC(8): C01G3/10C01G53/10C01G9/06C01G51/10F25B30/02
CPCC01G3/10C01G3/003C01G53/10C01G53/003C01G9/06C01G9/003C01G51/10C01G51/003F25B30/02
Inventor 林玉泰
Owner XIAMEN LEEBAM MEMBRANE TECH
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