Integrated purification equipment for electrochromism bath solution

Abstract

The utility model provides integrated purification equipment for electroplating chromium bath solution, which is characterized in that the integrated purification equipment comprises an impurity removal module and a recycling module, the impurity removal module comprises a bath solution lifting pump, a heat exchanger, a microporous filter, a macroporous resin exchange column and a cationic resin exchange column which are connected in sequence, and the impurity removal module further comprises a compressor; and the recycling module comprises a chromium plating tank, a backflow pipeline and a water inlet pipeline. The utility model develops an efficient electroplating chromium-containing bath solution purification process. According to the technology, synchronous deep removal of organic matter, trivalent chromium and other cation pollutants in the chromium plating bath solution is achieved in a breakthrough mode, and the purification efficiency and the recycling value of the chromium plating bath solution are effectively improved.

Description

Technical Field

[0001] The utility model relates to integrated purification equipment, more specifically to integrated purification equipment for electroplating chromium bath liquid. Background Art

[0002] Chromium-containing electroplating, one of the three core plating types in the electroplating industry, encompasses key process steps such as roughening, chromium plating, and passivation. Its core raw material is chromic anhydride, a process that inevitably produces heavy metal chromium as a major pollutant. The roughening process is particularly critical and difficult to replace in the field of plastic electroplating. Although the market is actively promoting environmentally friendly processes such as trivalent chromium roughening and chromium-free roughening to replace traditional chromic acid roughening, the latter currently dominates. However, due to the characteristics of the chromic acid roughening process, the utilization rate of the roughening solution is low, and in long-term operation, its utilization rate only remains between 10% and 25%.

[0003] Directly replacing unused coarsening fluid with waste will produce large amounts of highly concentrated hexavalent chromium solution. This not only poses a severe challenge to wastewater treatment systems, increasing the difficulty and cost of treatment, but also represents a significant waste of precious chromium resources. To address this challenge, a variety of coarsening bath purification and recovery technologies have emerged on the market, such as diaphragm electrolysis, recovery tank concentration, low-temperature evaporation concentration, and activated carbon adsorption. However, these technologies are often limited to treating either organic matter or trivalent chromium separately, making it difficult to achieve simultaneous purification.

[0004] Given the dual importance of chromium coarsening solution recovery in terms of environmental protection and economic benefits, this utility model has developed a highly efficient electroplating chromium bath purification process. This process achieves a breakthrough in the simultaneous and deep removal of organic matter and cationic pollutants such as trivalent chromium from the chromium plating bath, effectively improving the purification efficiency and reuse value of the chromium bath. Through this process, not only is the closed-loop recycling of hexavalent chromium promoted, significantly reducing the hexavalent chromium concentration in wastewater discharge, but it also greatly reduces the burden and cost of subsequent wastewater treatment, opening up a new path for the green transformation and clean production of the electroplating industry, and has far-reaching significance for environmental protection and sustainable development. Summary of the Invention

[0005] In order to solve the above technical problems, the utility model provides an integrated purification device for electroplating chromium bath liquid, which adopts the following technical solutions:

[0006] An integrated purification device for electroplating chromium bath liquid, characterized by comprising an impurity removal module and a recycling module, wherein the impurity removal module comprises a bath liquid lifting pump, a heat exchanger, a microporous filter, a macroporous resin exchange column, and a cationic resin exchange column connected in sequence, and further comprises a compressor; the recycling module comprises a chromium plating tank, a reflux pipe, and a water inlet pipe;

[0007] Furthermore, the cationic resin exchange column is connected to the chrome plating tank via a reflux pipe, and the chrome plating tank is connected to the tank liquid lifting pump via a water inlet pipe;

[0008] Furthermore, the macroporous resin exchange column contains macroporous adsorption resin, and the cationic resin exchange column contains cationic exchange resin;

[0009] Furthermore, the microporous filter adopts a filter element or filter disc made of ceramic material;

[0010] Furthermore, the heat exchanger uses PE as the main material and pure titanium-based material as the main material of the heat exchange fan. The heat exchange fan is hollow inside and is distributed in the exchange container in a baffle pattern. At the same time, the outside of the heat exchange fan is connected to the compressor by a conduit, and the inside of the conduit is filled with refrigerant.

[0011] Compared with the prior art, the advantages of the present invention are:

[0012] (1) The utility model realizes the recycling of chromium-containing electroplating bath liquid, successfully increases the recycling rate of hexavalent chromium to more than 95%, significantly improves resource utilization efficiency, and reduces environmental pollution risks;

[0013] (2) The utility model effectively treats the chromium-containing bath solution through condensation precipitation technology, and significantly reduces the content of organic matter in the bath solution by means of physical and chemical means, greatly reducing the burden of organic matter treatment on the subsequent adsorption resin, and ensuring the efficiency and stability of the treatment process;

[0014] (3) In order to overcome the secondary pollution problem caused by the reaction between hexavalent chromium and activated carbon in the traditional activated carbon adsorption process, the utility model innovatively adopts macroporous ion exchange resin as a substitute, which not only effectively removes organic matter in the tank liquid, but also avoids the loss of hexavalent chromium, further improving the treatment effect and economic benefits;

[0015] (4) The utility model has significant advantages in treating chromium-containing bath liquids, such as stable process, low treatment cost and high recycling efficiency, providing strong technical support for the green development of the electroplating industry;

[0016] (5) The utility model not only occupies a small area, but is also easy to operate, greatly saving space and labor costs, and is easy to promote and apply in various electroplating production lines;

[0017] (6) The unique adsorption column replacement mode in the device of the utility model allows for rapid replacement of the adsorption column with a new one when it reaches saturation, and centralized regeneration of the old adsorption column. This design not only improves work efficiency, but also effectively avoids the waste of regeneration reagents, thus maximizing resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the present utility model.

[0019] Among them, 1-impurity removal module, 2-recycling module, 3-tank liquid lifting pump, 4-heat exchanger, 5-microporous filter, 6-macroporous resin exchange column, 7-cationic resin exchange column, 8-compressor, 9-chrome plating tank, 10-reflux pipe, 11-water inlet pipe. DETAILED DESCRIPTION

[0020] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific implementations.

[0021] like Figure 1 As shown, the utility model provides an integrated purification device for electroplating chromium tank liquid, which includes an impurity removal module 1, a recycling module 2, a tank liquid lifting pump 3, a heat exchanger 4, a microporous filter 5, a macroporous resin exchange column 6, a cationic resin exchange column 7, a compressor 8, a chromium plating tank 9, a reflux pipe 10, and a water inlet pipe 11.

[0022] The device includes an impurity removal module 1 and a recycling module 2. The impurity removal module 1 includes a tank liquid lifting pump 3, a heat exchanger 4, a microporous filter 5, a macroporous resin exchange column 6 and a cationic resin exchange column 7 connected in sequence. The impurity removal module 1 also includes a compressor 8; the recycling module 2 includes a chrome plating tank 9, a reflux pipe 10 and a water inlet pipe 11.

[0023] The cationic resin exchange column 7 is connected to the chrome plating tank 9 via a reflux pipe 10 , and the chrome plating tank 9 is connected to the tank liquid lifting pump 3 via a water inlet pipe 11 .

[0024] The macroporous resin exchange column 6 contains macroporous adsorption resin, and the cationic resin exchange column 7 contains cationic exchange resin.

[0025] The microporous filter 5 is a filter element or filter disc made of ceramic material.

[0026] The heat exchanger 4 is made of PE as the main material.

[0027] The working principle of the device is as follows: the tank liquid in the chrome plating tank 9 enters the heat exchanger 4 through the water inlet pipe 11 under the action of the tank liquid lifting pump 3. The tank liquid temperature in the heat exchanger 4 is reduced under the action of the compressor 8, and some organic matter is condensed and precipitated. The condensed tank liquid enters the microporous filter 5, and the condensed organic matter is trapped in the microporous filter 5 to obtain a tank liquid free of organic matter. The liquid out of the microporous filter 5 enters the macroporous resin exchange column 6 to further remove the residual organic matter in the tank liquid, thereby achieving the purpose of secondary purification. The liquid out of the macroporous resin exchange column 6 enters the cationic resin exchange column 7 to remove the Cr in the tank liquid. 3+ 、Cu 2+ 、Ni 2+ The bath liquid after secondary purification is recycled to the chrome plating tank 9 through the reflux pipe 10, thus achieving purification and recycling of the bath liquid.

[0028] Macroporous resin exchange column: After adsorption saturation, the macroporous adsorption resin can be regenerated with methanol or ethanol solution. When the regeneration solution loses its regeneration effect, it can be transferred to the park sewage treatment plant to serve as a biochemical carbon source;

[0029] Cationic resin exchange column: Cationic exchange resin can be regenerated with 5~20% sulfuric acid solution. After repeated use, when the regeneration solution loses its regeneration effect, it can be transferred to a sewage treatment plant for treatment. Example

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0031] like Figure 1 As shown, this project adopts the above technical solution to trial-produce an integrated purification equipment for electroplating chromium bath liquid, and the treatment object is electroplating chromium bath liquid.

[0032] The device includes an impurity removal module 1 and a recycling module 2. The impurity removal module 1 includes a tank liquid lifting pump 3, a heat exchanger 4, a microporous filter 5, a macroporous resin exchange column 6 and a cationic resin exchange column 7 connected in sequence. The impurity removal module 1 also includes a compressor 8; the recycling module 2 includes a chrome plating tank 9, a reflux pipe 10 and a water inlet pipe 11.

[0033] The cationic resin exchange column 7 is connected to the chrome plating tank 9 via a reflux pipe 10 , and the chrome plating tank 9 is connected to the tank liquid lifting pump 3 via a water inlet pipe 11 .

[0034] The macroporous resin exchange column 6 contains macroporous adsorption resin, and the cationic resin exchange column 7 contains cationic exchange resin.

[0035] The microporous filter 5 is a filter element or filter disc made of ceramic material.

[0036] The heat exchanger 4 is made of PE as the main material.

[0037] Device treatment effect

[0038] The treatment object is the actual chromium coarsening tank liquid of a certain electroplating workshop. After being treated by purification equipment and processing technology, the impurity removal rate is greater than 90%, which meets the reuse requirements. The quality of the raw water and the water after impurity removal is shown in the following table:

[0039] Table 1 Water quality of the actual chromium roughening bath in an electroplating workshop before and after treatment (unit: mg / L)

[0040] water sample <![CDATA[Cr 6+ ]]> <![CDATA[Cr 3+ ]]> <![CDATA[Cu 2+ ]]> <![CDATA[Ni 2+ ]]> <![CDATA[Zn 2+ ]]> <![CDATA[Fe 3+ ]]> <![CDATA[Ca 2+ ]]> TOC Chromium coarsening tank liquid raw water 231300 20030 1894 428 16.1 205.96 121 5870 Remove impurities from water 231180 522.4 95.2 21.6 1.13 18.3 6.54 550.2

[0041] The above-described embodiments are merely intended to illustrate one embodiment of the present invention and are not intended to limit the present invention. It should be noted that a person skilled in the art may modify the technical solutions described in the above-described embodiments or replace some or all of the technical features therein with equivalents; and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of protection of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative work shall fall within the scope of protection of the present invention.

Claims

1. An integrated purification device for chromium electroplating bath, characterized in that: It includes an impurity removal module and a recycling module. The impurity removal module includes a tank liquid lifting pump, a heat exchanger, a microporous filter, a macroporous resin exchange column and a cationic resin exchange column connected in sequence. The impurity removal module also includes a compressor; the recycling module includes a chrome plating tank, a reflux pipe and a water inlet pipe.

2. The integrated purification equipment for chromium electroplating bath according to claim 1, characterized in that: The cationic resin exchange column is connected to the chrome plating tank via a reflux pipe, and the chrome plating tank is connected to the tank liquid lifting pump via a water inlet pipe.

3. The integrated purification equipment for chromium electroplating bath according to claim 1, characterized in that: The macroporous resin exchange column contains macroporous adsorption resin, and the cationic resin exchange column contains cationic exchange resin.

4. The integrated purification equipment for chromium electroplating bath according to claim 1, characterized in that: The microporous filter adopts a filter element or filter disc made of ceramic material.

5. The integrated purification equipment for chromium electroplating bath according to claim 1, characterized in that: The heat exchanger adopts PE material as the main material.

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