CN216360521U

CN216360521U - Device for recovering metal palladium

Info

Publication number: CN216360521U
Application number: CN202122953018.1U
Authority: CN
Inventors: 王小广; 陈祥衡; 吴渤; 石杨; 李明军; 王青龙; 徐若飞
Original assignee: Shenzhen Zhongke Outaihua Environmental Protection Technology Co ltd
Current assignee: Shenzhen Zhongke Outaihua Environmental Protection Technology Co ltd
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-04-22
Anticipated expiration: 2031-11-29

Abstract

The utility model discloses a device for recovering metal palladium, which comprises a waste liquid pool (1), a reaction pool (2), a precipitation filter pool (3), a delivery pump (4) and an electrolytic bath (5) which are connected in sequence; the reaction tank (2) is connected with a hydroxyl radical generator (6), and the precipitation filter tank (3) is respectively connected with a lye tank (7) and an acid tank (8). The new method for recovering the metallic palladium by adopting the device of the utility model thoroughly changes the defects of the original physical recovery method, and adopts a chemical method to carry out gel breaking on the colloidal palladium and recover the ionic palladium into the metallic palladium.

Description

Device for recovering metal palladium

Technical Field

The utility model relates to the field of PCBs, in particular to a device for recycling metal palladium.

Background

In national economic construction, the PCB is a basic industry for industrialization and informatization development, and along with the continuous development of economic construction, the PCB industry is rapidly developed. Both electroless copper plating and electroless gold plating in normal circuit board production produce palladium and are present in the waste liquor in the form of substantially colloidal palladium, so recovery of palladium is undertaken starting from colloidal palladium. At present, although the colloidal palladium can be effectively recovered by a physical method, the cost is too high, the recovery benefit is directly influenced, the colloidal palladium becomes a difficult point of a technical method for recovering the colloidal palladium, and the colloidal palladium is also a key problem which is always required to be solved by enterprises.

Because the economic value of palladium is very high, the usage amount of palladium in the production process is huge, and meanwhile, the usage amount of colloidal palladium is generally more than 10 times of that of ionic palladium, therefore, for the recovery technology of metal palladium, various enterprises actively research new technical methods so as to achieve low-cost recovery and create more economic benefits. However, to date, there has been no practical recovery technique.

Aiming at the current situation of recovering metallic palladium, a new technical method is needed to be researched at present to make up for the defects of the existing recovery of metallic palladium, so that the recovery of metallic palladium can be realized, the recovery benefit can be effectively improved, the problem of high-cost recovery can be better solved, and a better new path is found for the palladium recovery technology in chemical copper plating and chemical gold plating of the circuit board production process.

Disclosure of Invention

The technology of the utility model provides an effective device adopted by a novel chemical method recovery technology according to the defects of the existing physical method recovery technology of metal palladium, and can better solve the defects of the existing recovery technology of palladium. The novel technical method implemented by the device is implemented by recovering both colloidal palladium and ionic palladium into metal palladium, and the key point is to solve the problem of converting the colloidal palladium into the ionic palladium, effectively control the precipitation of ionic tin and finally recover the metal palladium through electrolysis. The method adopting the device utilizes a new chemical method and a new process, and firstly carries out gel breaking reaction on the colloidal palladium in the waste liquid.

The reaction principle is as follows:

[PdSn₂]Cl₆→Pd⁺²+Sn⁺²

gel breaking is carried out through reaction, colloid palladium in the waste liquid can be rapidly converted into ionic palladium and ionic tin through oxidation, then the ionic tin in the waste liquid can be precipitated through controlling according to the pH value of the waste liquid, and after the ionic tin is filtered and separated out, the palladium-containing waste liquid is sent to electrolysis for recycling metal palladium.

A device for recovering metal palladium comprises a waste liquid pool, a reaction pool, a precipitation filter pool, a delivery pump and an electrolytic bath which are connected in sequence; the reaction tank is connected with a hydroxyl radical generator, and the precipitation filter tank is respectively connected with a lye tank and an acid tank.

The device for recovering the metal palladium, provided by the utility model, is characterized in that a first waste liquid inlet and an oxidant feeding port are arranged on the reaction tank; a second waste liquid inlet, an alkali liquid feeding port and an acid liquid feeding port are formed in the sedimentation filter tank; and a third waste liquid inlet and a waste liquid discharge outlet are arranged on the electrolytic cell.

The device for recovering the metallic palladium is characterized in that a stirrer is arranged in the reaction tank.

The new method for recovering the metal palladium is different from the prior art in that:

the new method for recovering the metallic palladium by adopting the device of the utility model thoroughly changes the defects of the original physical recovery method, and adopts a chemical method to carry out gel breaking on the colloidal palladium and recover the ionic palladium into the metallic palladium. Although the existing recovery method of colloidal palladium can effectively recover colloidal palladium by a physical method, the recovery benefit is influenced due to overhigh cost, and a feasible recovery technology does not exist so far. The research of the device can be carried out by adopting a novel chemical method, colloid palladium is quickly and effectively converted into ionic palladium and ionic tin by strong oxidation, and the ionic palladium and the ionic tin are filtered and separated, so that the recovery of metal palladium can be realized by electrolysis, the recovery benefit can be improved, the electrode plate structure is not influenced during electrolysis, and the problem of high-cost recovery of metal palladium can be better solved.

The method adopting the device of the utility model can become a new method for recovering metal palladium, and most importantly, the originally adopted physical recovery technical method is changed, a new chemical method is adopted, particularly, colloidal palladium can be quickly and effectively converted into ionic palladium through a strong oxidation technology, a very key step is played for the process technology for recovering metal palladium, meanwhile, according to the performance of tin, a method for respectively controlling the pH value is adopted, so that ionic tin can be almost completely precipitated and can be filtered and separated, and the method is a key second step. Under the circumstance of no precedent, the method is an innovative attempt to recover the metal palladium, and a better new path is found for the palladium recovery technology in the electroless copper plating and the electroless gold plating of the circuit board production process.

According to the device for recovering the metal palladium, disclosed by the utility model, a novel chemical method can be selected by analyzing and researching the defect that the original colloidal palladium is recovered into the metal palladium, so that a better new path is found for low-cost recovery. More importantly, the economic value of the palladium is high, and the amount of the palladium used in the production process is large. Meanwhile, the usage amount of the colloidal palladium is generally more than 10 times of that of ionic palladium, so that more economic benefits can be effectively created while the method for recovering metal palladium is solved.

The apparatus for recovering metallic palladium of the present invention will be further described with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic structural diagram of an apparatus for recovering metallic palladium according to the present invention.

Detailed Description

Example 1

As shown in fig. 1, the device for recovering metal palladium of the present invention comprises a waste liquid tank 1, a reaction tank 2, a precipitation filtration tank 3, a delivery pump 4 and an electrolytic bath 5 which are connected in sequence; the reaction tank 2 is connected with a hydroxyl radical generator 6, and the precipitation filter tank 3 is respectively connected with a lye tank 7 and an acid tank 8.

Wherein, a first waste liquid inlet and an oxidant feeding port are arranged on the reaction tank 2; a second waste liquid inlet, an alkali liquid feeding port and an acid liquid feeding port are formed in the sedimentation filter tank 3; a third waste liquid inlet and a waste liquid discharge outlet are arranged on the electrolytic cell 5; a stirrer 9 is provided in the reaction tank 2.

The novel method for recovering the metal palladium adopts the device for treatment, and specifically comprises the following steps:

(A) sending the waste liquid containing the colloidal palladium of the circuit board production line into a waste liquid pool 1 for concentration;

(B) sending the waste liquid in the waste liquid pool 1 into a reaction pool 2, adding an oxidant hydroxyl radical on line, carrying out oxidation reaction under stirring, and carrying out gel breaking on the colloidal palladium; the step utilizes the strong oxidizing property of hydroxyl free radicals to destroy the particle structure of the colloidal palladium so as to form ionic palladium and ionic tin in the waste liquid;

(C) sending the waste liquid in the reaction tank 2 into a precipitation filter tank 3, and controlling and adding alkali liquor or acid liquor (firstly detecting the pH value, adding the alkali liquor into the alkaline waste liquid and adding the acid liquor into the acidic waste liquid) on line according to the pH value of the waste liquid to ensure that the ionic tin is almost completely precipitated, and then separating the ionic tin through filtration;

(D) and (3) sending the waste liquid of the precipitation filter tank 3 into an electrolytic tank 5 through a delivery pump 4, electrolyzing, recovering metal palladium, and sending the electrolyzed waste liquid to a sewage plant for treatment.

In the step (B), the hydroxyl radicals are added at a constant speed by adopting a hydroxyl radical generator 6, the adding amount is 21-27 g/t of the waste liquid, and the reaction stirring time after the hydroxyl radicals are added is 1.5-2 hours. The concentrations of the acid liquor and the alkali liquor are both 10%, and when the alkali liquor needs to be added, the adding amount of the alkali liquor is controlled according to the pH value of more than or equal to 8; when the acid liquor is required to be added, the adding amount of the acid liquor is controlled by the pH value being less than or equal to 3, so that the requirement that the ionic tin is almost completely precipitated can be met.

And (3) performing suction testing on the waste liquid after electrolysis: the recovery of palladium is close to 95%.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.

Claims

1. An apparatus for recovering metallic palladium, characterized in that: comprises a waste liquid pool (1), a reaction pool (2), a precipitation filter pool (3), a delivery pump (4) and an electrolytic tank (5) which are connected in sequence; the reaction tank (2) is connected with a hydroxyl radical generator (6), and the precipitation filter tank (3) is respectively connected with a lye tank (7) and an acid tank (8).

2. The apparatus of claim 1, wherein: a first waste liquid inlet and an oxidant feeding port are formed in the reaction tank (2); a second waste liquid inlet, an alkali liquid feeding port and an acid liquid feeding port are formed in the sedimentation filter tank (3); and a third waste liquid inlet and a waste liquid discharge outlet are arranged on the electrolytic cell (5).

3. The apparatus of claim 2, wherein: a stirrer (9) is arranged in the reaction tank (2).