CN220003240U - Stainless steel pickling waste acid clean system - Google Patents

Abstract

The utility model relates to a stainless steel pickling waste acid purifying system, which comprises a circulating tank, a purifying device and a collecting device, wherein the purifying device comprises a filtering device and an ion exchange device, the filtering device is provided with a filtering inlet and a filtering outlet, the filtering inlet is communicated with the outlet of the circulating tank, and the inlet of the ion exchange device and the inlet of the circulating tank are both communicated with the filtering outlet; the outlet of the ion exchange equipment is communicated with the inlet of the collecting device, and the outlet of the collecting device is communicated with the inlet of the circulating tank; the maximum process flow of the filter device is greater than the maximum process flow of the ion exchange device. On the basis of the original filter, at least one filter is connected in parallel, so that the treatment flow of the filter can meet the requirement of full-load operation of the resin bed, and the acid liquor which is not treated by the resin bed can directly flow back to the circulating tank for use by an acid washing production line, thereby utilizing the resin bed to the maximum extent and having good economical efficiency.

Description

Stainless steel pickling waste acid clean system

Technical Field

The utility model relates to the technical field of waste acid treatment, in particular to a stainless steel pickling waste acid purifying system.

Background

A method of removing scale and rust on the surface of steel using an acid solution is called pickling. Is a method of cleaning metal surfaces. The acid solution and the oxide skin on the stainless steel surface layer continuously react in the acid tank to generate acid mud. In order to control the mud amount of the acid liquor in the acid washing circulation system and reduce the quality problem caused by the large mud amount of the acid liquor, an acid purification system is required to treat the waste acid.

The existing waste acid purification system is mainly treated by a filter and an ion exchanger, the acid mud is filtered by the filter, and the filtered waste acid passes through the ion exchanger to separate metal ions into clean acid and then is reused by an acid washing production line. Wherein the maximum process flow of the filter is less than the maximum process flow of the ion exchanger. When the maximum treatment flow of the filter is smaller than that of the ion exchanger, the ion exchanger cannot run at full load, so that the whole waste acid treatment capacity of the waste acid treatment system is limited, and when the waste acid discharged from the acid washing production line cannot be treated in time, acid liquid can be provided for the acid washing production line only by a continuous acid discharge replacement mode, so that a great amount of acid liquid is wasted, and the waste acid treatment system is to be improved.

Disclosure of Invention

In order to reduce acid liquor waste and improve the economical efficiency of a stainless steel pickling waste acid purification system, the utility model provides the stainless steel pickling waste acid purification system.

The utility model provides a stainless steel pickling waste acid purification system, which adopts the following technical scheme:

a stainless steel pickling waste acid purification system, the system comprises a circulation tank, a purification device and a collection device, wherein the purification device comprises a filtration device and an ion exchange device, the filtration device is provided with a filtration inlet and a filtration outlet, the filtration inlet is communicated with the outlet of the circulation tank, and the inlet of the ion exchange device and the inlet of the circulation tank are both communicated with the filtration outlet; the outlet of the ion exchange equipment is communicated with the inlet of the collecting device, and the outlet of the collecting device is communicated with the inlet of the circulating tank; the maximum process flow of the filter device is greater than the maximum process flow of the ion exchange device.

Optionally, the filtering device comprises at least two filters, and the maximum treatment flow rate of a single filter is smaller than the maximum treatment flow rate of the ion exchange device, the inlets of the at least two filters are communicated as the filtering inlet of the filtering device, and the outlets of the at least two filters are communicated as the filtering outlet of the filtering device.

Optionally, the purifying device further comprises a clean acid tank for temporarily storing the acid liquid which is filtered by the filtering equipment but cannot be treated in time by the ion exchange equipment, wherein an inlet of the clean acid tank is communicated with the filtering outlet of the filtering equipment, and an outlet of the clean acid tank is communicated with an inlet of the ion exchange equipment and an inlet of the circulating tank.

Optionally, the system further comprises a pretreatment device, wherein the pretreatment device comprises an acid receiving tank for temporarily storing the acid liquid from the circulating tank, and the acid receiving tank is communicated between an outlet of the circulating tank and the filtering inlet of the filtering device.

Optionally, the pretreatment device further comprises a waste acid tank for preliminary acid precipitation, and the waste acid tank is communicated between an outlet of the circulation tank and an inlet of the acid receiving tank.

Optionally, the collecting device comprises a regeneration acid tank; the inlet of the regeneration acid tank is communicated with the outlet of the ion exchange equipment, and the outlet is communicated with the inlet of the circulating tank.

Optionally, the system further comprises a dirt collecting device; the filtering equipment is also provided with a sewage outlet which is communicated with the sewage collecting device.

Optionally, the ion exchange apparatus has a waste gate; the waste water port is communicated with the sewage collecting device.

Optionally, the stainless steel pickling waste acid purifying system further comprises a controller, wherein the controller is in signal connection with the ion exchange equipment, the clean acid tank and the regenerated acid tank; the controller monitors and adjusts the liquid levels in the ion exchange unit, the clean acid tank, and the regeneration acid tank to coordinate with one another.

Optionally, the dirt collecting device is a pit.

As described above, the stainless steel pickling waste acid purification system provided by the utility model has at least the following beneficial effects:

1. on the basis of the original filter, at least one filter is connected in parallel, so that the treatment flow of the filter can meet the requirement of full-load operation of the resin bed, and the acid liquor which is not treated by the resin bed can directly flow back to the circulating tank for use by an acid washing production line, thereby utilizing the resin bed to the maximum extent and having good economical efficiency.

2. The liquid level in the clean acid tank, the acid collecting tank and the acid tank of the resin bed are detected and regulated by the controller, so that the resin bed can timely adjust the working conditions of the resin bed according to the liquid level in the clean acid tank, the acid collecting tank and the acid tank of the resin bed, and further the operation of the resin bed can be better matched with the operation of at least two filters, the circulating device and the acid washing production line, and the working efficiency of the stainless steel acid washing waste acid purifying system is improved.

Drawings

FIG. 1 is a schematic diagram showing the construction of a stainless steel pickling waste acid purification system according to an embodiment of the present utility model.

Fig. 2 is a schematic diagram showing the control principle of the controller according to the embodiment of the present utility model.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. It is also to be understood that the terminology used in the examples of the utility model is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the utility model. The test methods in the following examples, in which specific conditions are not noted, are generally conducted under conventional conditions or under conditions recommended by the respective manufacturers.

Please refer to fig. 1-2. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the utility model, are not intended to be critical to the essential characteristics of the utility model, but are intended to fall within the spirit and scope of the utility model. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.

The utility model provides a stainless steel pickling waste acid purifying system which comprises a circulating tank, a purifying device and a collecting device.

Referring to fig. 1, acid liquor containing acid sludge and metal ions generated after the acid washing operation of the acid washing production line is discharged into the circulation tank, and the acid liquor at the moment contains a large amount of acid sludge and metal ions, is treated by the purification device to remove the acid sludge and the metal ions, and flows back to the circulation tank after passing through the collection device. The acid liquor in the circulating tank can also be pumped into the acid pickling production line for acid pickling operation after being prepared.

In order to relieve the operation pressure of the purification device, the stainless steel pickling waste acid purification system also comprises a pretreatment device, wherein the pretreatment device comprises a receiving acid tank and a waste acid tank, an inlet of the waste acid tank is communicated with an outlet of the circulating tank, an outlet of the waste acid tank is communicated with the receiving acid tank, and an outlet of the receiving acid tank is communicated to the purification device.

Specifically, before the acid liquor in the circulating tank enters the purifying device, the acid liquor firstly enters the waste acid tank, so that the acid liquor is primarily precipitated in the waste acid tank, and a part of acid sludge in the acid liquor is separated.

After the acid liquor is primarily precipitated by the waste acid tank, the acid liquor is discharged into the acid receiving tank, and the acid receiving tank can temporarily store the acid liquor. When the flow of acid liquor discharged from the acid washing production line changes, the temporary storage effect of the acid receiving tank can adjust the flow of the acid liquor entering the downstream purification device and the collection device, so that the purification device and the collection device can stably operate.

With continued reference to fig. 1, the purification apparatus includes a filtration device having a filtration inlet and a filtration outlet, the filtration inlet being connected to the outlet of the circulation tank, and the inlet of the ion exchange device and the inlet of the circulation tank being connected to the filtration outlet.

The purification device comprises at least two filters connected in parallel and an ion exchange device. The maximum treatment flow rate of the single filter is smaller than the maximum treatment flow rate of the ion exchange equipment. The inlets of the two filters are communicated with each other to serve as a filtering inlet of the filtering equipment, and the filtering inlet is communicated with an outlet of the acid receiving tank and is communicated with the circulating tank through the acid receiving tank and the waste acid tank. The outlets of the two filters are communicated to be used as a filtering outlet of the filtering equipment. Preferably, the ion exchange device in this embodiment is a resin bed.

The filtering device is communicated with the downstream of the acid receiving tank, the acid liquid in the acid receiving tank is pumped into the filtering device, and the filtering device filters acid sludge in the acid liquid. The ion exchange device is communicated with the downstream of the filtering device, and after the acid liquor filtered by the filtering device enters the ion exchange device, metal ions in the acid liquor are adsorbed and discharged, and the acid liquor is discharged to the collecting device.

In this embodiment, the number of filters is two, and in other embodiments of the present utility model, the number of filters may be three or more.

When the maximum treatment flow rate of the single filter is smaller than the maximum treatment flow rate of the resin bed, the resin bed cannot be operated at full load. If a filter with larger maximum treatment flow is used, the original filter is eliminated, and the economical efficiency is poor. If the resin bed with smaller maximum treatment flow is replaced, the cost of the resin bed is high on one hand, and on the other hand, the maximum treatment capacity of the resin bed is small, so that the improvement of the productivity of the acid washing production line is not facilitated.

Therefore, the stainless steel pickling waste acid purifying system is connected with at least one filter in parallel on the basis of a single filter, so that the maximum treatment flow of at least two filters connected in parallel is larger than the maximum treatment flow of a resin bed, the resin bed can run at full load, the whole waste acid treating capacity of the stainless steel pickling waste acid purifying system is effectively improved, the acid waste caused by acid discharge replacement is reduced, and the improvement of the productivity of a pickling production line is facilitated.

The purification device further comprises a clean acid tank, an inlet of the clean acid tank is communicated with a filtering outlet of the filtering equipment, and an outlet of the clean acid tank is communicated with an inlet of the resin bed and is used for storing the acid liquid filtered by the filter for the use of the resin bed.

The outlet of the clean acid tank is also in communication with the inlet of the recycle tank such that the filtration outlet of the filtration apparatus is also in communication with the inlet of the recycle tank. When the treatment flow of at least two filters is greater than the maximum treatment flow of the ion exchange equipment, the liquid level in the clean acid tank can be gradually increased, and when the liquid level in the clean acid tank is higher, part of acid liquor in the clean acid tank directly flows back into the circulating tank for being used by the acid washing production line.

More specifically, two filters are connected in parallel through a pipeline and a four-way valve, and the remaining two joints of the four-way valve after the parallel connection are respectively connected to the inlet of the clean acid tank and the inlet of the circulating tank through pipelines.

When the liquid level in the clean acid tank is lower, the joint of the four-way valve connected to the circulating tank is closed, so that the acid liquid filtered by the filter completely flows into the clean acid tank. When the liquid level in the clean acid tank is higher, the joint of the four-way valve connected to the circulating tank is opened, and the joint connected to the clean acid tank is partially or completely closed, so that the acid liquid filtered by the filter flows to the circulating tank partially or completely.

It should be noted that, in this embodiment, the "connection" may be implemented by a valve matched with a pipeline. The valve can be an electromagnetic valve or other valves which can conveniently control the on-off of the pipeline.

With continued reference to fig. 1, the collecting device includes a regeneration acid tank, an inlet of which is communicated with an outlet of the ion exchange device, and an outlet of which is communicated with an inlet of the circulation tank, for storing the acid solution treated by the resin bed. After the acid liquid in the regenerated acid tank is pumped into the circulating tank, the acid liquid can be reused for the acid washing production line after being prepared.

The acid sludge and the waste water containing metal ions discharged from the resin bed are used as waste generated after the acid liquid is purified by the purification device, and are harmful to the environment, but have recycling value, so that the stainless steel pickling waste acid purification system also comprises a sewage collecting device.

Both filters of the filtering device are provided with drain outlets for discharging acid sludge washed out of the filters. The drain outlets of the two filters are connected in parallel and serve as drain outlets of the filtering equipment. The resin bed has a waste water port through which waste water containing metal ions is discharged. The sewage collecting device is communicated with the sewage outlet of the filtering device and the waste water port of the resin bed, sludge generated by filtering acid liquor by the filter is discharged into the sewage collecting device to be collected, and the waste water containing metal ions discharged after the acid liquor is treated by the resin bed is also discharged into the sewage collecting device to be collected.

As the preferred, the sewage collecting device in the embodiment adopts a pit, the pit has simple structure and low cost, and the acid sludge and the wastewater are convenient to collect and transport.

In other embodiments of the utility model, the dirt collection device may employ other storage devices, such as a storage tank.

Because the processing flow of the filter and the processing flow of the resin bed are different, and the acid liquid amount discharged by the acid washing production line also fluctuates, in order to enable the water level of the water tank of the resin bed and the water level of the regenerated acid tank to be matched with each other, the stainless steel acid washing waste acid purifying system can stably operate, and the stainless steel acid washing waste acid purifying system also comprises a controller. The controller is in signal connection with the clean acid tank, the acid collecting tank and the resin bed, and monitors and adjusts the water levels of the clean acid tank, the acid collecting tank and the water tank of the resin bed.

The water in the water tank of the resin bed is mainly used for flushing the acid adsorbed by the resin, and is discharged into the acid collecting tank after acid liquor is formed.

Specifically, referring to fig. 2, the control principle of the controller is:

s1, before the controller performs control, whether the preparation condition is met or not is detected, if yes, the control is started, and if not, the stainless steel pickling waste acid purifying system is required to be recovered to meet the preparation condition.

The preparation conditions include:

1. the stainless steel pickling spent acid purification system is in an automatic mode and no alarm is activated.

2. The stainless steel pickling waste acid purifying system is in a non-stop state.

3. The liquid level in the clean acid tank is at or below the intermediate level.

And S2, after the controller starts to control, firstly detecting the liquid level in the clean acid tank, and if the liquid level in the clean acid tank is not at a high liquid level, executing the steps S6 and S7. When the controller detects that the liquid level in the clean acid tank is at a high liquid level, the controller controls the resin bed to operate, and the acid liquid in the clean acid tank flows into the resin bed to be subjected to water replacement, so that the acid in the acid liquid is adsorbed, and the wastewater containing metal ions is formed.

S3, the controller detects whether the acid liquor in the acid collecting tank is at or above the intermediate liquid level and whether the water in the water tank of the resin bed is at a high liquid level.

If the acid liquid level in the acid collecting tank is at or above the intermediate level, waiting for the acid liquid in the acid collecting tank to be pumped into the circulating tank until the acid liquid level in the acid collecting tank is below the intermediate level. If the water in the water tank of the resin bed is below the high liquid level, waiting for the water to be supplemented to the high liquid level.

When the acid liquid in the acid collecting tank is at or above the intermediate liquid level, the water in the water tank of the resin bed is at a high liquid level, the controller controls the resin bed to begin to discharge waste, and the waste water containing metal ions generated by the resin bed is discharged into the sewage collecting device.

After the waste discharge is completed, the controller detects whether the acid liquid level in the clean acid tank is at a low level, if so, water is supplemented into the water tank of the resin bed so as to facilitate the subsequent treatment of the acid liquid, and if not, the acid tank in the clean acid tank waits for flowing into the resin bed until the acid liquid level in the clean acid tank is recovered to the low level.

S4, after the water tank of the resin bed is filled with water to a high liquid level, the resin bed is subjected to acid replacement, namely, the bed body adsorbed with the acid is washed through water in the water tank of the resin bed to form acid liquor.

In the acid replacement process, the controller detects whether water in a water tank of the resin bed is at or below an intermediate liquid level, if not, acid replacement is continued, and detects whether the liquid level of acid liquid in the acid collecting tank is at a high liquid level, if not, acid replacement is continued.

S5, when the water in the water tank of the resin bed is at or below the intermediate liquid level and the acid liquid level in the acid collecting tank is at a high liquid level, the controller controls the resin bed to discharge the product to the acid collecting tank, namely the acid liquid after being integrally treated by the purifying device.

S6, in the process of discharging the product from the resin bed, if the controller detects that the water tank of the resin bed is at a low liquid level, acid is supplemented into the acid collecting tank through a manual or other feeding device, so that the acid liquor in the acid collecting tank reaches the standard capable of being used by the acid washing production line again.

S7, when the resin bed continuously discharges the product until the liquid level of the acid collecting tank reaches a high liquid level, re-executing S1-S6.

The controller can monitor and adjust the liquid level in the clean acid tank, the acid collecting tank and the acid tank of the resin bed through the steps S1-S7, so that the resin bed can timely adjust the working conditions of the resin bed according to the liquid level in the clean acid tank, the acid collecting tank and the acid tank of the resin bed, and further the operation of the resin bed can be better matched with the operation of at least two filters, the circulating device and the acid washing production line, and the working efficiency of the stainless steel acid washing waste acid purification system is improved.

In summary, the stainless steel pickling waste acid purification system provided by the utility model is connected with at least one filter in parallel on the basis of the original filter, so that the treatment flow of the filter can meet the requirement of full-load operation of a resin bed, and acid liquor which is not treated by the resin bed can directly flow back to a circulating tank for use in a pickling production line, the resin bed is utilized to the greatest extent, and the economy is good.

Compared with the waste acid purification system with a filter with larger maximum treatment flow, the stainless steel pickling waste acid purification system provided by the utility model has the advantages that the original filter can be used, and the cost is saved.

Compared with the waste acid purification system with a resin bed with smaller maximum treatment flow, the stainless steel pickling waste acid purification system provided by the utility model has lower cost and is beneficial to improving the productivity of a pickling production line.

In addition, the stainless steel pickling waste acid purification system provided by the utility model detects and adjusts the liquid levels in the clean acid tank, the acid collecting tank and the acid tank of the resin bed by adopting the controller, so that the resin bed can timely adjust the working conditions of the resin bed according to the liquid levels in the clean acid tank, the acid collecting tank and the acid tank of the resin bed, and further the operation of the resin bed, the operation of at least two filters, the circulation device and the pickling production line can be better mutually coordinated, and the working efficiency of the stainless steel pickling waste acid purification system is improved.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. Stainless steel pickling waste acid clean system, the system includes circulation tank, purifier and collection device, its characterized in that:

the purification device comprises a filtration device and an ion exchange device, wherein the filtration device is provided with a filtration inlet and a filtration outlet, the filtration inlet is communicated with the outlet of the circulating tank, and the inlet of the ion exchange device and the inlet of the circulating tank are both communicated with the filtration outlet;

the outlet of the ion exchange equipment is communicated with the inlet of the collecting device, and the outlet of the collecting device is communicated with the inlet of the circulating tank;

the maximum process flow of the filter device is greater than the maximum process flow of the ion exchange device.

2. The stainless steel pickling spent acid purification system according to claim 1, wherein the filtration device comprises at least two filters, and a maximum treatment flow of a single filter is smaller than a maximum treatment flow of the ion exchange device, wherein inlets of the at least two filters are communicated as the filtration inlet of the filtration device, and outlets of the at least two filters are communicated as the filtration outlet of the filtration device.

3. The stainless steel pickling waste acid purification system according to claim 1, wherein the purification device further comprises a clean acid tank for temporarily storing the acid liquid which is filtered by the filtering device but cannot be treated in time by the ion exchange device, an inlet of the clean acid tank is communicated with the filtering outlet of the filtering device, and an outlet of the clean acid tank is communicated with both an inlet of the ion exchange device and an inlet of the circulating tank.

4. The stainless steel pickling spent acid purification system of claim 1, further comprising a pretreatment device comprising a receiving acid tank for temporary storage of acid liquor from the circulation tank, the receiving acid tank being in communication between an outlet of the circulation tank and the filtration inlet of the filtration device.

5. The stainless steel pickling spent acid purification system of claim 4, wherein the pretreatment device further comprises a spent acid tank for preliminary precipitation of acid solution, the spent acid tank being in communication between an outlet of the circulation tank and an inlet of the receiver acid tank.

6. The stainless steel pickling spent acid purification system of claim 3, wherein the collection device comprises a regenerated acid tank;

the inlet of the regeneration acid tank is communicated with the outlet of the ion exchange equipment, and the outlet is communicated with the inlet of the circulating tank.

7. The stainless steel pickling spent acid purification system of claim 1, further comprising a dirt collection device;

the filtering equipment is also provided with a sewage outlet which is communicated with the sewage collecting device.

8. The stainless steel pickling spent acid purification system of claim 7, wherein the ion exchange device has a spent water gap;

the waste water port is communicated with the sewage collecting device.

9. The stainless steel pickling waste acid purification system of claim 6, further comprising a controller in signal communication with the ion exchange device, the clean acid tank, and the regenerated acid tank;

the controller monitors and adjusts the liquid levels in the ion exchange unit, the clean acid tank, and the regeneration acid tank to coordinate with one another.

10. The stainless steel pickling waste acid purification system of claim 7, wherein the dirt collection device is a pit.