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A kind of method of reclaiming copper sulfate in acidic copper sulfate waste liquid

A technology of acidic copper sulfate and copper sulfate, applied in the direction of copper sulfate, etc., can solve the problems of burnt cathode, high processing cost, small processing capacity, etc., achieve uniform water quantity and quality, ensure process conditions, and reduce dosage.

Active Publication Date: 2022-01-11
GO HIGHER ENVIRONMENT GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The outstanding advantage of this technology is that it can recover high-purity copper products with a purity of 99.9%. The disadvantages are that the processing capacity is small, the organic copper extractant has emulsification, failure and other loss problems, and the pH adjustment process brings waste liquid volume increase, and the introduction of NH 4 + 、Na + , CO 3 2- Plasma and COD, after the incremental part is transferred to the waste liquid disposal company, it will also increase the difficulty of its standard discharge treatment
[0004] Chinese patent CN201220369211 introduces a vortex electrolysis technology. This technology is to add a vortex generator at the bottom of the traditional electrolytic cell. After the waste liquid is acted by the vortex generator, it forms a rapidly rotating fluid, which is in full contact with the cathode and anode surfaces of the electrolytic cell. It greatly improves the electrolysis efficiency, solves the problem of burning out the cathode due to the high electrolysis current density at high flow rate and the problem of easy short circuit due to the needle-shaped electrolyte on the upper part of the cathode. Although eddy current electrolysis has the above advantages compared with traditional electrolysis technology, However, it also has similar disadvantages to traditional electrolysis technology, that is, in acidic medium, the generated sediment will be dissolved in the waste liquid again, and the electrode plate needs to be replaced regularly, and the treatment cost is high
The advantage of this process is that the processing capacity is large, but its disadvantages are that the iron consumption is large, the purity of the recovered copper product is low, and a large amount of ferrous chloride waste liquid is produced, and the subsequent production of water treatment agent FeCl 3 The added value of resource utilization is low

Method used

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  • A kind of method of reclaiming copper sulfate in acidic copper sulfate waste liquid
  • A kind of method of reclaiming copper sulfate in acidic copper sulfate waste liquid
  • A kind of method of reclaiming copper sulfate in acidic copper sulfate waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] S1. Take 500L of acidic copper sulfate waste liquid and collect it in the regulating tank for uniform water volume and water quality;

[0052] S2. Pump the copper sulfate waste liquid with uniform water quality into the neutralization reaction tank, and add Cu(OH) 2 The powder adjusts the pH value to 3.56;

[0053] S3. Pump the acidic copper sulfate waste liquid that has been neutralized in step S2 to the first evaporative crystallization device, vacuumize the inside of the first evaporative crystallization device to -0.01MPa, and evaporate and crystallize at a temperature of 120°C for 2 hours The solid-liquid mixture is obtained, the exhaust gas is purified by the flue gas purification system and discharged, and the condensed water is discharged into the sewage pipe network;

[0054] S4. After the solid-liquid mixture after evaporation and crystallization in step S3 is subjected to solid-liquid separation through a filter press, a plate filter or a centrifuge, the obt...

Embodiment 2

[0058] S1. Take 500L of acidic copper sulfate waste liquid and collect it in the regulating tank for uniform water volume and water quality;

[0059] S2. Pump the copper sulfate waste liquid with uniform water quality into the neutralization reaction tank, and add Cu(OH) 2 The powder adjusts the pH value to 3.56;

[0060] S3. Pump the acidic copper sulfate waste liquid that has been neutralized in step S2 to the first evaporation crystallization device, vacuumize the first evaporation device to -0.06MPa, and evaporate and crystallize at a temperature of 140°C for 3.5h The solid-liquid mixture is obtained, the exhaust gas is purified by the flue gas purification system and discharged, and the condensed water is discharged into the sewage pipe network;

[0061] S4. After the liquid-solid mixture after evaporation and crystallization in step S3 is subjected to solid-liquid separation through a filter press, a plate filter or a centrifuge, the obtained solid is naturally air-drie...

Embodiment 3

[0065] S1. Take 500L of acidic copper sulfate waste liquid and collect it in the regulating tank for uniform water volume and water quality;

[0066] S2. Pump the copper sulfate waste liquid with uniform water quality into the neutralization reaction tank, and add Cu(OH) 2 The powder adjusts the pH value to 3.56;

[0067] S3. Pump the acidic copper sulfate waste liquid that has been neutralized in step S2 to the first evaporative crystallization device, vacuumize the first evaporative crystallization device to -0.09MPa, and evaporate and crystallize at a temperature of 160°C for 5 hours The solid-liquid mixture is obtained, the exhaust gas is purified by the flue gas purification system and discharged, and the condensed water is discharged into the sewage pipe network;

[0068] S4. After the liquid-solid mixture after evaporation and crystallization in step S3 is subjected to solid-liquid separation through a filter press, a plate filter or a centrifuge, the obtained solid is...

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Abstract

This application relates to the field of waste liquid treatment, and specifically discloses a method for recovering copper sulfate in acidic copper sulfate waste liquid, comprising the following steps: S1, collecting acidic copper sulfate waste liquid; S2, adding Cu to acidic copper sulfate waste liquid (OH) 2 Carry out neutralization treatment; S3, pump the acidic copper sulfate waste liquid in step S2 to the crystallization and evaporation in the first evaporation crystallization device; S4, after the material in step S3 passes through the solid-liquid separation system, obtain copper sulfate product, separate The evaporated mother liquor is discharged into the impurity removal reactor; S5, adding NaOH solid to the impurity removal reactor to generate Cu(OH) 2 The precipitate returns to step S2 after being dehydrated and washed, and the supernatant enters the second evaporative crystallization device or enters the sewage treatment station of the factory area for further treatment; S6, the second evaporative crystallizer conducts crystallization and evaporation of the supernatant. The method has the advantages of high purity of the recovered product, no new impurity ions are introduced during the dosing process, stable operation of the treatment process and no secondary pollutants.

Description

technical field [0001] The application relates to the technical field of waste liquid treatment, more specifically, it relates to a method for reclaiming copper sulfate in acidic copper sulfate waste liquid. Background technique [0002] Acidic copper sulfate waste liquid is the copper sulfate consumption liquid in the electroplating tank discharged from the semiconductor wafer in the copper manufacturing process. Its main components are copper sulfate and sulfuric acid. The weight ratio is about 15%. According to the "National Hazardous Waste List", the acidic copper sulfate waste liquid belongs to the HW22 category of hazardous waste. If it is not treated effectively, it will pollute the environment and waste resources. At present, the recycling technologies of acidic copper sulfate waste liquid mainly include extraction-electrowinning recovery technology, eddy current electrolysis technology, ion exchange method, iron powder replacement technology for copper recovery, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G3/10
CPCC01G3/10C01P2006/80
Inventor 陈福泰褚永前杨艳刘栋
Owner GO HIGHER ENVIRONMENT GRP CO LTD
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