CN218931872U

CN218931872U - Cyanide-containing electroplating wastewater decyanation treatment system

Info

Publication number: CN218931872U
Application number: CN202222049872.XU
Authority: CN
Inventors: 宋岱峰
Original assignee: Chengdu Meifute Environmental Protection Industry Co ltd
Current assignee: Chengdu Meifute Environmental Protection Industry Co ltd
Priority date: 2022-08-04
Filing date: 2022-08-04
Publication date: 2023-04-28
Anticipated expiration: 2032-08-04

Abstract

The utility model discloses a decyanation treatment system for electroplating cyanide-containing wastewater, which solves the technical problems of large introducing amount of mixed salt and toxic gas generation in the prior art. The cyanide-containing electroplating wastewater decyanation treatment system comprises: the first decyanation unit is used for oxidizing and removing cyanide in electroplating cyanide-containing wastewater and outputting a first-stage reactant; the first decyanation unit comprises a first reaction tank and first dosing equipment for adding an oxidant into the first reaction tank; the second decyanation unit is used for precipitating cyanide in the first-stage reactant and outputting a second-stage reactant; the second decyanation unit comprises a secondary reaction tank, second dosing equipment for adding a first pH regulator into the secondary reaction tank and third dosing equipment for adding a precipitant into the secondary reaction tank; and the solid-liquid separation unit is used for solid-liquid separation of the secondary reactant and outputting produced water.

Description

Cyanide-containing electroplating wastewater decyanation treatment system

Technical Field

The utility model relates to the technical field of decyanation of electroplating cyanide-containing wastewater, in particular to a decyanation treatment system of electroplating cyanide-containing wastewater.

Background

Cyanide ions are used as a strong complexing agent, can form complexes with a plurality of metal ions, and are widely applied to metallurgical and electroplating industries. In the copper plating process in the electroplating industry, the cyanide copper plating is simple and convenient to operate, and the obtained plating layer has bright surface, fine crystals, low porosity, easy polishing and good conductivity and weldability. Thus, cyanide copper plating is widely used despite the toxicity of cyanide and the environmental hazard that it causes, and thus a large amount of electroplating cyanide-containing wastewater is produced.

Cyanide has strong toxicity and quick action, can enter the human body through skin, respiratory inhalation, mucous membrane of a cavity, oral administration and other ways, and the resolved cyanide ions can be combined with ferric iron ions in cytochrome enzyme to lose the effect of oxygen transfer, prevent the respiration of cells and cause hypoxia asphyxia of tissues. Therefore, the cyanide content in the wastewater is strictly limited in the national electroplating wastewater discharge standard.

At present, the treatment method of electroplating cyanide-containing wastewater mainly adopts an alkali chlorination method, but the introduction amount of mixed salt of the alkali chlorination method is large, the method does not accord with the zero discharge operation concept of the electroplating wastewater, and the potential danger of generating toxic gas cyanide chloride exists in the treatment process. Therefore, a safe and efficient method for treating electroplating cyanide-containing wastewater is urgently needed.

Disclosure of Invention

The utility model mainly aims to provide a cyanide-containing electroplating wastewater decyanation treatment system, which aims to solve the technical problems of large introducing amount of mixed salt and toxic gas generation in the prior art.

In order to achieve the purpose, the utility model provides a decyanation treatment system for electroplating cyanide-containing wastewater, which has the following technical scheme:

the cyanide-containing electroplating wastewater decyanation treatment system comprises: the first decyanation unit is used for oxidizing and removing cyanide in electroplating cyanide-containing wastewater and outputting a first-stage reactant; the first decyanation unit comprises a first reaction tank and first dosing equipment for adding an oxidant into the first reaction tank; the second decyanation unit is used for precipitating cyanide in the first-stage reactant and outputting a second-stage reactant; the second decyanation unit comprises a secondary reaction tank, second dosing equipment for adding a first pH regulator into the secondary reaction tank and third dosing equipment for adding a precipitant into the secondary reaction tank; and the solid-liquid separation unit is used for solid-liquid separation of the secondary reactant and outputting produced water.

As a further improvement of the utility model: the first decyanation unit further comprises fourth dosing equipment for adding a second pH regulator into the first-stage reaction tank.

As a further improvement of the utility model: the first decyanation unit further comprises a first pH meter for detecting the pH value of reactants in the primary reaction tank.

As a further improvement of the utility model: the first decyanation unit further comprises an oxidation-reduction potential detector for detecting oxidation-reduction potential of reactants in the primary reaction tank.

As a further improvement of the utility model: the second decyanation unit also comprises a second pH meter for detecting the pH value of the reactant in the second-stage reaction tank.

As a further improvement of the utility model: the solid-liquid separation unit comprises a sedimentation tank, a fifth dosing device for adding a flocculating agent into the sedimentation tank, and a sixth dosing device for adding a third pH regulator into the sedimentation tank.

As a further improvement of the utility model: the solid-liquid separation unit also comprises a third pH meter for detecting the pH of the reactant in the sedimentation tank.

As a further improvement of the utility model: the solid-liquid separation unit also comprises a filtering device for filtering reactants in the sedimentation tank.

As a further improvement of the utility model: the decyanation treatment system also comprises a regulating tank, wherein the regulating tank is used for storing electroplating cyanide-containing wastewater.

According to the utility model, free cyanide and weak complex cyanide in electroplating cyanide-containing wastewater are removed through the oxidation reaction of the first decyanation unit, and then strong complex cyanide in electroplating cyanide-containing wastewater is removed through the precipitation reaction of the second decyanation unit, so that the decyanation rate is remarkably improved, the introduction amount of impurity salt is small, the solid waste amount is greatly reduced, and the treated water can reach the standard for reuse, and no harmful gas is generated. Therefore, the cyanide-containing electroplating wastewater decyanation treatment system has the advantages of very simple structure, low investment and operation cost, practicability which is obviously higher than that of the traditional basic chlorination method, and suitability for popularization and use in cyanide-containing electroplating wastewater, especially in a strong complexing cyanide-containing electroplating system.

The utility model is further described below with reference to the drawings and detailed description. Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The accompanying drawings, which form a part hereof, are shown by way of illustration and not of limitation, and in which are shown by way of illustration and description of the utility model.

In the drawings:

FIG. 1 is a schematic diagram of an embodiment of a cyanide-containing wastewater decyanation treatment system for electroplating according to the present utility model.

In the above figures:

100-primary reaction tank, 110-first dosing device, 120-fourth dosing device, 130-first pH meter, 140-oxidation-reduction potential detector, 200-secondary reaction tank, 210-second dosing device, 220-third dosing device, 230-second pH meter, 300-sedimentation tank, 310-fifth dosing device, 320-sixth dosing device, 330-third pH meter, 340-filtering device.

Detailed Description

The present utility model will now be described more fully hereinafter with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the utility model based on these descriptions. Before describing the present utility model with reference to the accompanying drawings, it should be noted in particular that:

the technical solutions and technical features provided in the sections including the following description in the present utility model may be combined with each other without conflict.

In addition, the embodiments of the present utility model referred to in the following description are typically only some, but not all, embodiments of the present utility model. Therefore, all other embodiments, which can be made by one of ordinary skill in the art without undue burden, are intended to be within the scope of the present utility model, based on the embodiments of the present utility model.

Terms and units in relation to the present utility model. The terms "comprising," "having," and any variations thereof in the description and claims of the utility model and in the relevant sections are intended to cover a non-exclusive inclusion.

As shown in fig. 1, the cyanide-containing electroplating wastewater decyanation treatment system comprises an adjusting tank, a first decyanation unit, a second decyanation unit and a solid-liquid separation unit; the regulating tank is used for storing electroplating cyanide-containing wastewater; the first decyanation unit is used for oxidizing and removing cyanide in electroplating cyanide-containing wastewater and outputting a first-stage reactant; the second decyanation unit is used for precipitating cyanide in the first-stage reactant and outputting a second-stage reactant; the solid-liquid separation unit is used for solid-liquid separation of the secondary reactant and outputting produced water.

The first decyanation unit includes a first reaction tank 100, a first chemical adding device 110 for adding an oxidizing agent into the first reaction tank 100, a fourth chemical adding device 120 for adding a second pH regulator into the first reaction tank 100, a first pH meter 130 for detecting the pH of the reactant in the first reaction tank 100, and an oxidation-reduction potential detector 140 for detecting the oxidation-reduction potential of the reactant in the first reaction tank 100. If the pH of the electroplating cyanide-containing wastewater is above 9, the fourth dosing device 120 is in a deactivated state, otherwise, naOH is used as a second pH regulator to adjust the pH of the electroplating cyanide-containing wastewater to above 9.

The second decyanation unit includes a secondary reaction tank 200, a second dosing device 210 for adding a first pH adjuster to the secondary reaction tank 200, a third dosing device 220 for adding a precipitant to the secondary reaction tank 200, and a second pH meter 230 for detecting the pH of the reactant in the secondary reaction tank 200.

The solid-liquid separation unit includes a settling tank 300, a fifth dosing device 310 for adding a flocculant to the settling tank 300, a sixth dosing device 320 for adding a third pH adjustor to the settling tank 300, a third pH meter 330 for detecting the pH of the reactant in the settling tank 300, and a filtering device 340 for filtering the reactant in the settling tank 300.

When the system is adopted to decyanate electroplating cyanide-containing wastewater with the water quality parameters shown in table 1, the oxidant is H ₂ O ₂ The oxidation reaction time is 30min, the oxidation-reduction potential of the reactant in the primary reaction tank 100 is ORP > 150mv, and the precipitant is FeSO ₄ Solution, the first pH regulator is H ₂ SO ₄ The pH of the reactant in the secondary reaction tank 200 is 8, the third pH regulator is NaOH, the pH of the reactant in the sedimentation tank 300 is 10, and the flocculating agent is PAC and PAM.

TABLE 1

The water quality parameters of the produced water are shown in Table 2.

As can be seen from Table 2, cyanide in the electroplating cyanide-containing wastewater in example 1 is mainly free cyanide and weakly complex cyanide, and thus the total cyanide removal rate can be 99.5% by the first decyanation unit. The electroplating cyanide-containing wastewater in example 2 contains not only a large amount of free cyanide and weak complex cyanide, but also a large amount of strong complex cyanide, and the total cyanide removal rate can reach 99.6% by matching the first decyanation unit and the second decyanation unit.

TABLE 2

The content of the present utility model is described above. Those of ordinary skill in the art will be able to implement the utility model based on these descriptions. Based on the foregoing, all other embodiments that may be obtained by one of ordinary skill in the art without undue burden are within the scope of the present utility model.

Claims

1. Electroplating cyanide-containing wastewater decyanation treatment system is characterized in that: comprising the following steps:

the first decyanation unit is used for oxidizing and removing cyanide in electroplating cyanide-containing wastewater and outputting a first-stage reactant; the first decyanation unit comprises a first reaction tank (100) and first dosing equipment (110) for adding an oxidant into the first reaction tank (100);

the second decyanation unit is used for precipitating cyanide in the first-stage reactant and outputting a second-stage reactant; the second decyanation unit comprises a secondary reaction tank (200), a second dosing device (210) for adding a first pH regulator into the secondary reaction tank (200) and a third dosing device (220) for adding a precipitant into the secondary reaction tank (200);

and the solid-liquid separation unit is used for solid-liquid separation of the secondary reactant and outputting produced water.

2. The cyanide-containing wastewater decyanation treatment system for electroplating according to claim 1, wherein: the first decyanation unit further includes a fourth dosing device (120) that adds a second pH adjustor to the primary reaction tank (100).

3. The cyanide-containing wastewater decyanation treatment system for electroplating according to claim 2, wherein: the first decyanation unit further includes a first pH meter (130) that detects the pH of the reactant within the primary reaction tank (100).

4. The cyanide-containing wastewater decyanation treatment system for electroplating according to claim 1, wherein: the first decyanation unit further comprises an oxidation-reduction potential detector (140) for detecting oxidation-reduction potential of reactants in the primary reaction tank (100).

5. The cyanide-containing wastewater decyanation treatment system for electroplating according to claim 1, wherein: the second decyanation unit further comprises a second pH meter (230) for detecting the pH of the reactant in the secondary reaction tank (200).

6. The cyanide-containing wastewater decyanation treatment system for electroplating according to claim 1, wherein: the solid-liquid separation unit comprises a sedimentation tank (300), a fifth dosing device (310) for adding a flocculating agent into the sedimentation tank (300) and a sixth dosing device (320) for adding a third pH regulator into the sedimentation tank (300).

7. The cyanide-containing wastewater decyanation treatment system for electroplating according to claim 6, wherein: the solid-liquid separation unit further comprises a third pH meter (330) for detecting the pH of the reactant in the sedimentation tank (300).

8. The cyanide-containing wastewater decyanation treatment system for electroplating according to claim 6, wherein: the solid-liquid separation unit further comprises a filtering device (340) for filtering the reactant in the sedimentation tank (300).

9. The cyanide-containing wastewater decyanation treatment system for electroplating according to claim 1, wherein: the system also comprises a regulating tank for storing electroplating cyanide-containing wastewater.