CN211445340U - Electrolytic tinning passivation chromium-containing wastewater recycling system - Google Patents

Abstract

The application discloses a recycling system for chromium-containing wastewater of electrotinning passivation, which relates to the technical field of industrial sewage treatment, and is provided with a wastewater collection container, a pre-filtering mechanism, a cation exchange mechanism and an anion exchange mechanism which are sequentially connected through a pipeline, wherein the wastewater collection container stores the chromium-containing wastewater, the pre-filtering mechanism removes suspended matters, the cation exchange mechanism adsorbs metal ions, the anion exchange mechanism adsorbs dichromate, the treated effluent flows into a water recovery container, the cation exchange mechanism and the anion exchange mechanism are respectively regenerated through an acid adding mechanism and an alkali adding mechanism when the adsorption is saturated, the wastewater flowing out in the regeneration stage flows into the chromium recovery container as chromium recovery liquid, the system can sequentially carry out pretreatment, ion exchange method treatment and chromium-containing wastewater of electrotinning passivation, and specifically remove pollutants in the wastewater, the obtained sodium dichromate recovered liquid and recovered water can be returned to the production line for continuous utilization, so that the pollution is reduced and the operation cost is reduced.

Description

A kind of electroplating tin passivation chromium-containing wastewater recycling system

【Technical field】

The present application is in the technical field of industrial sewage treatment, and in particular relates to a system for recycling and reusing chromium-containing wastewater by electroplating tin passivation.

【Background technique】

For enterprises that produce tinplate products, in the production process of electroplated tin sheet, the passivation process will produce a certain amount of wastewater containing hexavalent chromium pollutants. Hexavalent chromium is a heavy metal pollutant that is strictly controlled by the state. Therefore, how to reasonably treat chromium-containing wastewater and realize the recycling of heavy metals and water is an urgent problem to be solved.

【Content of utility model】

In order to solve the above-mentioned technical problems, the present application provides a kind of electroplating tin passivation chromium-containing waste water recycling system with a simple structure, which can effectively treat the waste water, and can obtain sodium dichromate recovery solution and recovery water, and then The obtained sodium dichromate recovery liquid and recovered water can be returned to the production line for continuous use, reducing pollution and operating costs.

In order to solve the above-mentioned technical problems, the application adopts the following technical solutions:

An electroplating tin passivated chromium-containing wastewater recycling system, comprising a wastewater collection container for storing chromium-containing wastewater connected in sequence through pipelines, a pre-filtering mechanism for primary filtration treatment of chromium-containing wastewater, and a pre-filtering mechanism that can be used for adsorption A cation exchange mechanism for metal ions in chromium-containing wastewater and an anion exchange mechanism for adsorbing dichromate in chromium-containing wastewater, the outlet of the anion exchange mechanism is divided into two paths, one path is connected to the recovery water container through a pipeline, and the other path It is communicated with the chromium recovery container through a pipeline, the cation exchange mechanism is provided with an acid addition mechanism for adding an acidic regenerant, and the anion exchange mechanism is provided with an alkali addition mechanism for adding an alkaline regenerant.

The above-mentioned electroplating tin passivation chromium-containing waste water recycling system, the pre-filtration mechanism includes a waste water pump, a quartz sand filter, a precision filter and a pre-filtered water collection container that are communicated in turn through a pipeline, and the waste water pump uses In order to transport the chromium-containing wastewater from the wastewater collection container to the quartz sand filter, the quartz sand filter and the precision filter are used for the primary filtration of the chromium-containing wastewater in turn to remove the suspended solids in the chromium-containing wastewater. , the pre-filtered water collection container is used to store the primary filtered chromium-containing wastewater.

The above-mentioned electroplating tin passivation chromium-containing wastewater recycling system, the cation exchange mechanism comprises a cation pump, a first cation exchanger and a second cation exchanger, the first cation exchanger and the second cation The water inlet end of the exchanger is provided with a pre-filtered water inlet communicated with the waste water collection container through a pipeline and a regeneration acid addition port communicated with the acid addition mechanism through a pipeline, and the first cation exchanger and the The water outlet of the second cation exchanger is provided with a cation removal outlet that communicates with the anion exchange mechanism through a pipeline, and the cation pump is arranged between the waste water collection container and the first cation exchanger and the second cation exchanger. The pipeline between the two cation exchangers is used to transport the chromium-containing wastewater for primary filtration, and both the first cation exchanger and the second cation exchanger are provided with a cation exchange resin that can be used for adsorbing metal ions.

In the above-mentioned system for recycling and reusing chromium-containing wastewater from electroplating tin passivation, control valves are provided on the pre-filtration water inlet, the regeneration acid addition port and the cation-removing water outlet.

The above-mentioned electroplating tin passivation chromium-containing wastewater recycling system, the anion exchange mechanism includes a first anion exchanger, a second anion exchanger and a third anion exchanger, the first anion exchanger, the The water inlet ends of the second anion exchanger and the third anion exchanger are both provided with a decation water inlet communicated with the cation exchange mechanism through a pipeline, and a regeneration alkali addition port communicated with the alkali addition mechanism through a pipeline , and the outlet ends of the first anion exchanger, the second anion exchanger and the third anion exchanger are all provided with a recovered water outlet that communicates with the recovered water container through a pipeline, and a recovered water outlet connected to the recovered water container through a pipeline. Anion exchange resin is provided in the first anion exchanger, the second anion exchanger and the third anion exchanger.

The above-mentioned electroplating tin passivation chromium-containing waste water recycling system, the water inlet and outlet of the first anion exchanger, the second anion exchanger and the third anion exchanger are all provided with control valve.

As described above, the electroplating tin passivation chromium-containing wastewater recycling system, the acid adding mechanism includes a regeneration acid medicine tank and a regeneration acid pump, the regeneration acid medicine tank is communicated with the cation exchange mechanism through a pipeline, and the regeneration An acid regenerating agent is arranged in the acid tank, and the regenerating acid pump is arranged on the pipeline between the regenerating acid tank and the cation exchange mechanism and is used to transport the acid regenerating agent in the regenerating acid tank to a the cation exchange mechanism.

The above-mentioned electroplating tin passivation chromium-containing wastewater recycling system, the alkali adding mechanism includes a regenerated alkali medicine tank and a regenerated alkali pump, the regenerated alkali medicine tank is communicated with the anion exchange mechanism through a pipeline, and the regeneration An alkaline regenerant is arranged in the alkali medicine tank, and the regenerated alkali pump is arranged on the pipeline between the regenerated alkali medicine tank and the anion exchange mechanism, and is used to transfer the alkaline regenerant in the regenerated alkali medicine tank delivered to the anion exchange mechanism.

The above-mentioned electroplating tin passivation chromium-containing wastewater recovery and reuse system, between the anion exchange mechanism and the recovery chromium container, there is an evaporation device that can be used for evaporating and concentrating the recovered chromium solution flowing out of the anion exchange mechanism. enrichment agency.

The above-mentioned electroplating tin passivation chromium-containing waste water recycling system also includes multiple groups of waste water monitoring systems arranged on pipelines and used for detection. One or several of the pH meters are made up in series.

Compared with the prior art, the beneficial effects of the present application are as follows:

An electroplating tin passivation chromium-containing wastewater recycling system of the present application is provided with a wastewater collection container, a pre-filtration mechanism, a cation exchange mechanism, and an anion exchange mechanism that are sequentially connected through pipes, wherein the wastewater collection container is used for storing chromium-containing wastewater. , the chromium-containing wastewater is initially pre-filtered by the pre-filtration mechanism to remove the suspended solids in the wastewater, and the metal ions in the wastewater are adsorbed by the cation exchange mechanism, such as (Cr ³⁺ , Fe ²⁺ ), the purpose is to prevent the metal ions from affecting the subsequent The ion exchange process has an influence, and then the dichromate in the wastewater is adsorbed by the anion exchange mechanism. The chromium content in the effluent treated by the anion exchange mechanism has reached the discharge standard (meeting the passivation spray water reuse requirements). All the way from the anion exchange mechanism The outlet flows into the recovered water container. When the cation exchange mechanism and the anion exchange mechanism are saturated with adsorption, the exchange is stopped. The acidic regenerant is added to the cation exchange mechanism through the acid addition mechanism, and the alkaline regenerant is added to the anion exchange mechanism through the alkali addition mechanism. Inside, the cation exchange mechanism and the anion exchange mechanism are regenerated to restore the exchange capacity, and the chromium in the wastewater flowing out in the regeneration stage flows out from the anion exchange mechanism in the form of sodium dichromate, which can be used as a chromium recovery solution (satisfying the passivation bath solution). Recycling requirements) flow into the chromium recovery container from another outlet of the anion exchange mechanism. This system can sequentially pre-process and reuse chromium-containing wastewater from electroplating tin passivation and chromium-containing wastewater. Contaminants, the recovered water obtained can be used in the passivation spray tank, and the obtained chromium recovery solution can be returned to the passivation tank for continued use, and then the obtained sodium dichromate recovery solution and recovered water can be returned to the production line for continued use, Reduce pollution and reduce operating costs.

【Description of drawings】

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings that are used in the description of the embodiments.

Fig. 1 is the schematic diagram of a kind of electroplating tin passivation chromium-containing waste water recycling system of the present application.

【Detailed ways】

Please refer to FIG. 1, a system for recycling and reusing chromium-containing wastewater passivated by electroplating tin, including a wastewater collection container 1 for storing chromium-containing wastewater connected in sequence through pipelines, and a pre-filter for primary filtration treatment of chromium-containing wastewater. Filtration mechanism 2, cation exchange mechanism 3 that can be used to absorb metal ions in chromium-containing wastewater, and anion exchange mechanism 4 that can be used to absorb dichromate in chromium-containing wastewater. The outlet of the anion exchange mechanism 4 is divided into two paths, one through The pipeline is communicated with the recovered water container 5, and the other channel is communicated with the recovered chromium container 6 through the pipeline. The cation exchange mechanism 3 is provided with an acid addition mechanism 7 for adding an acidic regenerant, and the anion exchange mechanism 4 is provided with a useful Alkali addition mechanism 8 for adding alkaline regenerant.

An electroplating tin passivation chromium-containing waste water recycling system of the present application is provided with a waste water collection container 1, a pre-filtration mechanism 2, a cation exchange mechanism 3, and an anion exchange mechanism 4 connected in sequence through pipes, wherein the waste water collection container 1 is used for In order to store chromium-containing wastewater, the chromium-containing wastewater is initially pre-filtered by the pre-filter mechanism 2 to remove the suspended solids in the wastewater, and the cation exchange mechanism 3 is used to adsorb metal ions in the wastewater, such as (Cr ³⁺ , Fe ²⁺ ), which are The purpose is to prevent metal ions from affecting the subsequent ion exchange process, and then adsorb dichromate in the wastewater through anion exchange mechanism 4, and the chromium content in the effluent treated by anion exchange mechanism 4 has reached the discharge standard (meet the passivation spray water return. (required), flow into the recovery water container 5 from the outlet of the anion exchange mechanism 4, stop the exchange when the cation exchange mechanism 3 and the anion exchange mechanism 4 are saturated with adsorption, and add the acidic regenerant through the acid addition mechanism 7 into the cation exchange mechanism 3. , the alkaline regenerant is added into the anion exchange mechanism 4 through the alkali addition mechanism 8, and the cation exchange mechanism 3 and the anion exchange mechanism 4 are regenerated to restore the exchange capacity, and the chromium in the wastewater flowing out during the regeneration stage is replaced by sodium dichromate. The form flows out from the anion exchange mechanism 4, and can be used as a chromium recovery solution (meeting the passivation tank liquid recovery requirements) from another outlet of the anion exchange mechanism 4 into the recovery chromium container 6, and this system can sequentially passivate the electroplating tin passivated chromium-containing wastewater Pretreatment and ion exchange are used to treat and reuse chromium-containing wastewater to remove pollutants in the wastewater in a targeted manner. The recovered water can be used in the passivation spray tank, and the obtained chromium recovery solution can be returned to the passivation tank. The recovered sodium dichromate and recovered water can be returned to the production line for continuous use, reducing pollution and operating costs.

The pre-filtering mechanism 2 includes a waste water pump 21, a quartz sand filter 22, a precision filter 23 and a pre-filtered water collection container 24 that are connected in sequence through pipelines. The waste water pump 21 is used to collect chromium-containing waste water from the waste water. The container 1 is sent to the quartz sand filter 22, and the quartz sand filter 22 and the precision filter 23 are used for the primary filtration of the chromium-containing wastewater to remove the suspended solids in the chromium-containing wastewater. The water collection vessel 24 is used to store the primary filtered chromium-containing wastewater. Setting the quartz sand filter 22 can be used to intercept particulate impurities such as suspended solids and colloids in the waste water, and the precision filter 23 can be used to remove suspended solids, particles, rust and other impurities in the waste water. Preferably, the precision filter adopts a 5 μm filter element.

The cation exchange mechanism 3 includes a cation pump 31, a first cation exchanger 32 and a second cation exchanger 33, and the water inlet ends of the first cation exchanger 32 and the second cation exchanger 33 are provided with a pass through. The pre-filtration water inlet 301 communicated with the waste water collection container 1 and the regeneration acid addition port 302 communicated with the acid addition mechanism 7 through the pipeline, and the first cation exchanger 32 and the second cation exchanger The water outlet 33 is provided with a cation removal outlet 303 which is communicated with the anion exchange mechanism 4 through a pipeline, and the cation pump 31 is provided in the waste water collection container 1 and the first cation exchanger 32 and the The pipeline between the second cation exchangers 33 is used to transport the chromium-containing wastewater for primary filtration. Both the first cation exchanger 32 and the second cation exchanger 33 are provided with cation exchanges that can be used to adsorb metal ions. resin. The cation exchange mechanism 3 of the present application is provided with a first cation exchanger 32 and a second cation exchanger 33, using a one-use-one-standby method, when one of them is saturated with adsorption, the adsorption exchange is stopped and a regenerating acid is added to enter the regeneration stage. , and switch to another for adsorption exchange at the same time, which improves the work efficiency.

Control valves are provided on the pre-filter water inlet 301 , the regeneration acid addition port 302 and the cation removal water outlet 303 . The pipeline switching of waste water and regeneration acid is controlled by the control valve, so that when the ion exchanger is saturated, the pre-filtration water inlet 301 and the cation water outlet 303 are cut off, and the regeneration acid addition port 302 is opened to add regeneration acid for regeneration.

The anion exchange mechanism 4 includes a first anion exchanger 41, a second anion exchanger 42 and a third anion exchanger 43, the first anion exchanger 41, the second anion exchanger 42 and the third anion exchange The water inlet end of the device 43 is provided with a de-cation water inlet 401 communicated with the cation exchange mechanism 3 through a pipeline and a regeneration alkali addition button 402 communicated with the alkali addition mechanism through a pipeline, and the first anion exchange The water outlet ends of the device 41, the second anion exchanger 42 and the third anion exchanger 43 are all provided with a recovered water outlet 403 that communicates with the recovered water container 5 through a pipeline, and a recovered chromium container 6 through a pipeline. Anion exchange resin is provided in the first anion exchanger 41 , the second anion exchanger 42 and the third anion exchanger 43 , which are connected to the recovered chromium outlet 404 . The anion exchange mechanism 4 of the present application adopts dual use and one standby. When one of the anion exchangers is saturated, it switches to waste water and turns on the regeneration alkali for regeneration, thereby improving process fluency and filtration efficiency in turn.

Control valves are provided on the water inlet and outlet of the first anion exchanger 41 , the second anion exchanger 42 and the third anion exchanger 43 . Pipeline switching is performed through a control valve, preferably a solenoid valve, and online control is performed through a circuit to improve automation.

The acid adding mechanism 7 includes a regeneration acid medicine tank 71 and a regeneration acid pump 72. The regeneration acid medicine tank 71 is communicated with the cation exchange mechanism 3 through a pipeline, and an acid regeneration agent is arranged in the regeneration acid medicine tank 71. The regenerating acid pump 72 is arranged on the pipeline between the regenerating acid medicine tank 71 and the cation exchange mechanism 3 and is used to transport the acid regeneration agent in the regenerating acid medicine tank 71 to the cation exchange mechanism 3 . The addition amount of the acid regeneration agent in the regeneration acid medicine tank 71 is controlled by controlling the regeneration acid pump 72, preferably the acid regeneration agent is sulfuric acid, and the regeneration acid pump 72 is controlled by the circuit to improve the degree of automation.

The alkali adding mechanism 8 includes a regenerated alkali medicine tank 81 and a regenerated alkali pump 82, the regenerated alkali medicine tank 81 is communicated with the anion exchange mechanism 4 through a pipeline, and an alkaline regeneration agent is arranged in the regenerated alkali medicine tank 81 , the regenerated alkali pump 82 is arranged on the pipeline between the regenerated alkali medicine tank 81 and the anion exchange mechanism 4 and is used to transport the alkaline regeneration agent in the regenerated alkali medicine tank 81 to the anion exchange Institution 4. The amount of alkaline regeneration is controlled by controlling the regeneration alkali pump 82, preferably the alkaline regeneration agent is sodium hydroxide, and the anion exchanger is regenerated by adding.

Between the anion exchange mechanism 4 and the recovery chromium container 6, there is an evaporation and concentration mechanism 9 that can be used for evaporating and concentrating the recovered chromium solution flowing out of the anion exchange mechanism 4. The chromium recovery liquid flowing out of the anion exchange mechanism 4 can be evaporated and concentrated by the evaporation and concentration mechanism 9, thereby increasing the concentration of dichromic acid in the chromium recovery liquid.

It also includes multiple groups of waste water monitoring systems 10 arranged on the pipeline and used for detection. The waste water monitoring system 10 is composed of one or more of a pressure gauge, a flow meter, an on-line conductivity monitor and a pH meter in series. Through the wastewater monitoring system 10, various indicators of the wastewater in the pipeline can be intuitively reflected, so that the water flow, water pressure, pH value, etc. can be adjusted online, and the filtering effect of the system can be improved.

An electroplating tin passivation chromium-containing waste water recycling system of the present application is provided with a waste water collection container 1, a pre-filtration mechanism 2, a cation exchange mechanism 3, and an anion exchange mechanism 4 connected in sequence through pipes, wherein the waste water collection container 1 is used for In order to store chromium-containing wastewater, the chromium-containing wastewater is initially pre-filtered by the pre-filter mechanism 2 to remove the suspended solids in the wastewater, and the cation exchange mechanism 3 is used to adsorb metal ions in the wastewater, such as (Cr ³⁺ , Fe ²⁺ ), which are The purpose is to prevent metal ions from affecting the subsequent ion exchange process, and then adsorb dichromate in the wastewater through anion exchange mechanism 4, and the chromium content in the effluent treated by anion exchange mechanism 4 has reached the discharge standard (meet the passivation spray water return. (required), flow into the recovery water container 5 from the outlet of the anion exchange mechanism 4, stop the exchange when the cation exchange mechanism 3 and the anion exchange mechanism 4 are saturated with adsorption, and add the acidic regenerant through the acid addition mechanism 7 into the cation exchange mechanism 3. , the alkaline regenerant is added into the anion exchange mechanism 4 through the alkali addition mechanism 8, and the cation exchange mechanism 3 and the anion exchange mechanism 4 are regenerated to restore the exchange capacity, and the chromium in the wastewater flowing out during the regeneration stage is replaced by sodium dichromate. The form flows out from the anion exchange mechanism 4, and can be used as a chromium recovery solution (meeting the passivation tank liquid recovery requirements) from another outlet of the anion exchange mechanism 4 into the recovery chromium container 6, and this system can sequentially passivate the electroplating tin passivated chromium-containing wastewater Pretreatment and ion exchange are used to treat and reuse chromium-containing wastewater to remove pollutants in the wastewater in a targeted manner. The recovered water can be used in the passivation spray tank, and the obtained chromium recovery solution can be returned to the passivation tank. The recovered sodium dichromate and recovered water can be returned to the production line for continuous use, reducing pollution and operating costs.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection of the utility model.

Claims (10)

1. an electroplating tin passivation chromium-containing waste water recycling system, is characterized in that: comprise the waste water collection container (1) for storing chromium-containing waste water connected successively by pipeline, for carrying out primary filtration to chromium-containing waste water The treated pre-filtration mechanism (2), the cation exchange mechanism (3) that can be used to adsorb metal ions in the chromium-containing wastewater, and the anion exchange mechanism (4) that can be used to adsorb dichromate in the chromium-containing wastewater, the anion exchange mechanism ( The outlet of 4) is divided into two paths, one is communicated with the recovery water container (5) through the pipeline, and the other is communicated with the recovered chromium container (6) through the pipeline, and the cation exchange mechanism (3) is provided with an acid for adding acid. The acid addition mechanism (7) of the regeneration agent, the anion exchange mechanism (4) is provided with an alkali addition mechanism (8) for adding the alkaline regeneration agent. 2. The electroplating tin passivation chromium-containing waste water recycling system according to claim 1 is characterized in that: the pre-filtering mechanism (2) comprises a waste water pump (21), a quartz sand filter ( 22), a precision filter (23) and a pre-filtered water collection container (24), the waste water pump (21) is used to transport chromium-containing waste water from the waste water collection container (1) to the quartz sand filter ( 22), the quartz sand filter (22) and the precision filter (23) are used for the primary filtration of the chromium-containing wastewater to remove the suspended solids in the chromium-containing wastewater, and the pre-filtered water collection container (24) ) for the storage of primary filtered chromium-containing wastewater. 3. The electroplating tin passivation chromium-containing wastewater recycling system according to claim 1, wherein the cation exchange mechanism (3) comprises a cation pump (31), a first cation exchanger (32) and a Two cation exchangers (33), the water inlet ends of the first cation exchanger (32) and the second cation exchanger (33) are provided with a pre-treatment device that communicates with the waste water collection container (1) through pipes A filter water inlet (301) and a regeneration acid addition port (302) communicated with the acid addition mechanism (7) through a pipeline, and the first cation exchanger (32) and the second cation exchanger (33) The water outlet end of the ion exchange mechanism (4) is provided with a decation water outlet (303) which is communicated with the anion exchange mechanism (4) through a pipeline, and the cation pump (31) is arranged between the waste water collection container (1) and the first On the pipeline between the cation exchanger (32) and the second cation exchanger (33) and used to transport the primary filtered chromium-containing wastewater, the first cation exchanger (32) and the second cation exchanger (33) (33) is provided with a cation exchange resin that can be used for adsorbing metal ions. 4. The electroplating tin passivation chromium-containing waste water recycling system according to claim 3, characterized in that: the pre-filter water inlet (301), the regeneration acid addition port (302) and the cation removal outlet Control valves are arranged on the nozzles (303). 5. The electroplating tin passivation chromium-containing wastewater recycling system according to claim 1, wherein the anion exchange mechanism (4) comprises a first anion exchanger (41), a second anion exchanger (42) ) and a third anion exchanger (43), the first anion exchanger (41), the second anion exchanger (42) and the third anion exchanger (43) are all provided on the water inlet ends There is a decation water inlet (401) communicated with the cation exchange mechanism (3) through a pipeline, and a regeneration alkali addition port (402) communicated with the alkali addition mechanism through a pipeline, and the first anion exchanger (41) ), the water outlet ends of the second anion exchanger (42) and the third anion exchanger (43) are all provided with a recovered water outlet (403) communicating with the recovered water container (5) through pipes and The recovered chromium outlet (404), the first anion exchanger (41), the second anion exchanger (42) and the third anion exchanger ( 43) All are provided with anion exchange resin. 6. The electroplating tin passivation chromium-containing wastewater recycling system according to claim 5, characterized in that: the first anion exchanger (41), the second anion exchanger (42) and the first anion exchanger (42) Both the water inlet and the water outlet of the triple anion exchanger (43) are provided with control valves. 7. The electroplating tin passivation chromium-containing waste water recycling system according to claim 1, characterized in that: the acid adding mechanism (7) comprises a regeneration acid medicine tank (71) and a regeneration acid pump (72), so The regenerated acid medicine tank (71) is communicated with the cation exchange mechanism (3) through a pipeline, an acid regeneration agent is arranged in the regenerated acid medicine tank (71), and the regenerated acid pump (72) is arranged in the regenerated acid medicine tank (72). The pipeline between the acid medicine tank (71) and the cation exchange mechanism (3) is used to transport the acid regeneration agent in the regeneration acid medicine tank (71) to the cation exchange mechanism (3). 8. The electroplating tin passivation chromium-containing wastewater recycling system according to claim 1, characterized in that: the alkali adding mechanism (8) comprises a regenerated alkali medicine tank (81) and a regenerated alkali pump (82), so The regenerated alkali medicine tank (81) is communicated with the anion exchange mechanism (4) through a pipeline, an alkaline regeneration agent is arranged in the regenerated alkali medicine tank (81), and the regenerated alkali pump (82) is arranged in the The pipeline between the regeneration alkali medicine tank (81) and the anion exchange mechanism (4) is used to transport the alkaline regeneration agent in the regeneration alkali medicine tank (81) to the anion exchange mechanism (4). 9. The electroplating tin passivation chromium-containing wastewater recycling system according to claim 1, characterized in that: between the anion exchange mechanism (4) and the chromium recovery container (6), a There is an evaporation and concentration mechanism (9) for evaporating and concentrating the recovered chromium solution flowing out from the anion exchange mechanism (4). 10. The electroplating tin passivation chromium-containing waste water recycling system according to claim 1, characterized in that: it also comprises multiple groups of waste water monitoring systems (10) arranged on pipelines and used for detection, and the waste water monitoring system (10) 10) It is composed of one or more of pressure gauge, flow meter, conductivity online monitor and pH meter in series.

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