JPH08173719A - Removal of matter stuck with cement - Google Patents

Abstract

PURPOSE: To surely remove a matter stuck with cement by keeping an object soaked in a container filled with an acidic liquid to an extent that the object is slightly immersed, in a specified period of time, then extracting the acidic liquid from the container, and allowing a cleaning water to pass through the container. CONSTITUTION: A container 7 is internally composed of a treatment chamber 3 and a dehydration passage 5, a feeder tubular path 2 connected to the top of the container 7 and a draining tubular path 6 connected to the bottom. If a filter 4 is clogged due to the attachment of a foreign matter W stuck with cement, dilute hydrochloric acid is introduced into the container 7 from the draining tubular path 6, so that the filter 4 is slightly immersed in the container 7. Further, the filter 4 is kept soaked for a specified period of time in such a state that the filter 4 is slightly soaked in the dilute hydrochloric acid. Next, the dilute hydrochloric acid filled in the container 7 is drained from the draining tubular path 6. After that, a cleaning water is introduced into the container 7 from the draining tubular path 6 and is allowed to flow out of the feeder tubular path 2. Thus it is possible to remove the matter stuck with cement easily from the filter 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing cement deposits adhering to an object, and more particularly to a cement deposit suitable for use in a filter of a dewatering device for wastewater containing cement. It concerns the removal method.

[0002]

2. Description of the Related Art Generally, in equipment that handles cement and cement mixture, adhered cement is removed in order to prevent deterioration of its function. As such a device, for example, as shown in FIG. 1, a dehydration treatment device for sewage mixed with cement is known.

This dehydration treatment apparatus 1 has a supply pipe 2 to which cement-mixed sewage is pressure-fed, a treatment chamber 3 connected to an end of the supply pipe 2 on the downstream side, and this treatment chamber. A pair of filters 4 disposed on a pair of opposing wall portions of 3
And a drainage channel 5 provided on the opposite side of the processing chamber 3 of each filter 4, and a drainage channel 6 connected to these dehydration channels 5 for discharging the removed water to the outside of the apparatus. A vacuum pump (not shown) that draws moisture from the waste water in the processing chamber 3 by connecting the drain pipe 6 to a vacuum state is connected to the drain pipe 6.

In the dewatering apparatus 1 as described above, the sewage mixed with cement is fed into the processing chamber 3 via the supply line 2 and the dewatering path 5 as shown by an arrow (a) in FIG. The drainage conduit 6 is held in a vacuum state. As a result, the sewage is passed through each filter 4 and is discharged to the outside of the device through the dehydration passage 5 and the drainage pipe 6 as shown by the arrow (b) in FIG. At this point, the cement and other solid matter W mixed in are removed.

Then, in the dehydration processing apparatus 1,
As the wastewater is dehydrated, the solid W mixed with dehydrated cement is condensed in the processing chamber 3 to remove the solid W, and then the washing water for the filter 4 is removed. Is performed, and the dehydration process and the cleaning process are repeated.

By the way, in the above-mentioned filter 4, the solid matter W adheres due to the adhesive force of the cement mixed in even after the washing treatment of the solid matter W. By repeating the above-mentioned dehydration treatment and washing treatment, The solids W are accumulated and adhered, and the mesh of the filter 4 is clogged as shown in FIG.

Therefore, conventionally, it has been attempted to remove the solid matter W adhering from the filter 4 by rubbing the filter 4 with a brush in addition to the cleaning treatment.

By the way, in the above-described dehydration treatment, the drainage pipe 6 side is kept near atmospheric pressure, and the wastewater is passed through the filter 4 by pressurizing the wastewater from the supply pipe 2 at a predetermined pressure. It is also considered to do so.

[0009]

However, even when the solid W is removed by the conventional processing method as described above, as shown in FIG. 3, the solid W is removed so that the mesh can be seen. Although it can be removed,
There is a problem that the removal effect is not sufficient and the number of reusable times is limited. The defects caused by such cement deposits are not limited to the dehydration treatment device 1 described above, and also occur in devices that handle cement, such as concrete pumps and mixer trucks.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a method for removing cement deposits which can surely remove cement deposits.

[0011]

The method for removing cement deposits according to claim 1 of the present invention is a removal method for removing cement deposits adhering to an object in order to achieve the above-mentioned object. Therefore, after spraying cleaning water onto the cement deposits and performing preliminary cleaning, spraying an acidic liquid on the remaining cement deposits, and then spraying cleaning water onto the object to remove the residual cement deposits. It is characterized by doing. Here, dilute hydrochloric acid is preferably used as the acidic liquid.

According to the method for removing cement deposits according to claim 1 of the present invention, rough cement deposits are removed by preliminary washing with washing water, and then Ca component of cement is obtained by spraying an acidic liquid. The cement dissolves due to the reaction between the cement and the acid, whereby the adhesive force between the cement deposit and the object is lost, and the cement deposit is easily removed.

The method for removing cement deposits according to claim 2 of the present invention is a method for removing cement deposits adhering to an object loaded in a container.
The acid liquid is filled in the container to such an extent that the object is immersed, and the product is immersed in the container for a predetermined time, then, after the acidic liquid is extracted from the container, the washing water is circulated in the container, so that the cement adhered to the object. It is characterized by removing deposits. Examples of the container include a container of a dehydration treatment device for sewage in which cement is mixed.

According to the method for removing cement deposits according to the second aspect of the present invention, the Ca component of the cement is prepared by immersing the object with the cement deposits in the acidic liquid filled in the container for a predetermined time. The reaction of the acid with the acid dissolves the cement, which results in a weak or even weak adhesion between the cement deposit and the object, and then
By circulating the wash water through the container, cement deposits are easily removed from the object.

According to a third aspect of the present invention, in the method for removing cement deposits according to the second aspect, the object is a filter for capturing the cement deposits. This filter is a metal wire net made of stainless steel having a size capable of capturing the cement deposits, and is installed in the container of the dehydration treatment apparatus for wastewater containing cement.

According to the method for removing cement deposits according to the third aspect of the present invention, the Ca component of the cement is prepared by immersing the filter in which the cement deposits are attached to the acidic liquid filled in the container for a predetermined time. The cement dissolves due to the reaction of the acid with the acid, which causes the adhesive force between the cement deposit and the filter to be lost or considerably weakened. As it flows through the filter and passes through the eye of the filter, cement deposits are easily removed from the filter.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an example in which an embodiment of the present invention is applied to a filter 4 of a dehydration treatment apparatus 1 for wastewater containing cement as described above will be described.

First, the dewatering treatment of the wastewater in the dehydration treatment apparatus 1 and the washing with the washing water are repeatedly performed, and the filter 4 whose filtration capacity has fallen below the allowable range is removed from the dehydration treatment apparatus 1. In this state, the filter 4 has a large amount of cement deposits (solids W) as shown in FIG.

From this, by prewashing the filter 4 with cleaning water, as shown in FIG. 3, the solid matter W having a weak adhesive force is removed. As a result, the solid matter W is roughly removed.

Next, while adding hydrochloric acid as an acidic liquid to the cleaning water to generate diluted hydrochloric acid, the diluted hydrochloric acid is sprayed onto the filter 4 which has been preliminarily cleaned, and then the cleaning water is further sprayed on the object. As a result of performing such a treatment, the solid matter W attached to the filter 4
However, as shown in FIG. 4, most of them were removed, and good results were obtained. It is considered that this is because the cement is dissolved by the reaction of Ca ions, which are the components of the cement, with hydrochloric acid, and the adhesive force between the solid matter W and the filter 4 is lost.

Further, the washing with the washing water after spraying the dilute hydrochloric acid prevents the filter 4 from being violated by the unreacted dilute hydrochloric acid.

The spraying pressure of the washing water used for the treatment, the kind and concentration of the acidic liquid, etc. can be variously changed depending on the nature of the sewage treated and the material of the filter 4.

Next, as another example of the embodiment of the present invention, a method for removing the solid matter W adhering to the filter 4 with the filter 4 still installed in the container 7 of the dehydration treatment apparatus 1 will be described. To do. The container 7 of the dehydration processing apparatus 1 is a container that forms the dehydration path 5 with the processing chamber 3, and the processing chamber 3 and the dehydration path 5 are provided in the container 7. The supply pipe 2 is connected to the upper part of the container 7, and the drain pipe 6 is connected to the lower part.

First, when the dewatering process of the wastewater in the dewatering apparatus 1 is repeatedly performed and the filtering capacity reaches the allowable range or less, that is, when the solid matter W adheres to the filter 4 to cause clogging. Then, dilute hydrochloric acid is introduced from the drainage pipe 6 to fill the container 7 to such an extent that the filter 4 is immersed therein, as shown in FIG. The solid matter W condensed in the processing chamber 3 is removed before the dilute hydrochloric acid is filled. And
The filter 4 is immersed in dilute hydrochloric acid for a predetermined time. Then, the cement is dissolved by the reaction between Ca ions, which is a component of the cement, and hydrochloric acid, and the adhesive force between the solid W and the filter 4 is lost or considerably weakened, and a part of the solid W is partially removed. It peels off from the filter 4, and the rest adheres to the filter 4 in a state of being easily peeled off.

Next, the dilute hydrochloric acid filled in the container 7 is extracted from the drainage line 6. At this time, the solid matter W peeled off from the filter 4 is accumulated in the processing chamber 3.
After that, as shown in FIG. 6, the washing water is introduced into the container 7 from the drainage pipe 6 and is caused to flow out from the supply pipe 2, so that the washing water is introduced into the container 7 from below as indicated by an arrow. Distribute on top. At this time, the washing water passes from the dehydration passage 5 through the eyes of the filter 4, passes through the processing chamber 3 and the supply pipe 2
The solid matter W that adheres weakly to the filter 4 adheres to the inner surface of the filter 4,
When the wash water passes through the filter 4 from the outside to the inside, the solid matter W weakly attached to the filter 4 is peeled off and is carried on the flow of the wash water to be discharged from the supply pipe line 2 and, at the same time, the processing chamber. The solid matter W accumulated on the filter 3 also rides on the flow of the washing water and is discharged from the supply pipe line 2, whereby most of the solid matter W adhering to the filter 4 is removed, and the filter 4 is removed. To be washed.

In this way, the solid W is filtered by the filter 4
If it is removed from the filter 4, the filter 4 becomes
Since it is not necessary to remove the solid W, it is easy to remove the solid W, and automation can be achieved.

[0027]

As described above, according to the first aspect of the present invention.
The method for removing cement adhering matter according to 1, is a removing method for removing cement adhering to an object, and after performing pre-cleaning by spraying cleaning water onto the adhering cement, the remaining adhering cement is acidified. It is characterized by spraying a liquid and then spraying washing water on the object to remove the remaining adhered cement, and has the following excellent effects.

Preliminary washing with washing water removes rough cement deposits, and then spraying an acidic liquid eliminates the adhesive force between the cement deposits and the object, and easily removes the cement deposits. it can.

Further, by washing again with washing water,
It is possible to prevent the unreacted acidic liquid from adversely affecting the object and prevent the occurrence of defects such as corrosion of the object.

Further, according to the method for removing cement deposits according to the second aspect of the present invention, the object with cement deposits is immersed in the acidic liquid filled in the container for a predetermined period of time so that the cement deposits. The adhesion between the kimono and the object is lost or becomes weak, and then the cement adhering matter can be easily removed from the object by circulating the washing water through the container. Can be performed in a state where it is installed without taking out the object from the container, so that the solid matter can be easily removed and can be automated.

According to the method for removing cement deposits according to the third aspect of the present invention, since the object is the filter in the second aspect, when the washing water is passed through the container, this washing water is As it flows over the surface and passes through the eyes of the filter, cement deposits can be easily removed from the filter.

[Brief description of drawings]

FIG. 1 shows an example of equipment for handling cement,
It is a cross-sectional view of a main part of a dewatering device for wastewater containing cement.

2 shows a filter used in the dehydration treatment apparatus shown in FIG. 1, and is a front view of an essential part showing a state before performing a treatment for removing cement deposits.

3 shows a filter used in the dehydration treatment apparatus shown in FIG. 1, and is a front view of an essential part showing a state in which a treatment for removing cement deposits is performed by a conventional method.

4 shows a filter used in the dehydration treatment apparatus shown in FIG. 1, and is a front view of an essential part showing a state in which a treatment for removing cement deposits is performed by the removing method of the present invention.

5 is a view showing a main part of the dehydration treatment apparatus shown in FIG.
FIG. 3 is a vertical sectional view showing a state where dilute hydrochloric acid is easily filled.

FIG. 6 shows a main part of the dehydration treatment apparatus shown in FIG.
FIG. 4 is a vertical sectional view showing a state where cleaning water is easily distributed.

[Explanation of symbols]

 1 Dehydration treatment device 2 Supply pipeline 3 Processing chamber 4 Filter 5 Dehydration pipeline 6 Drainage pipeline 7 Container W Solid matter (cement deposit)

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[Procedure amendment]

[Submission date] August 25, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Detailed explanation of the invention

[Correction method] Change

[Correction content]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing cement deposits adhering to an object, and more particularly to a cement deposit suitable for use in a filter of a dehydration treatment apparatus for sludge containing cement. It concerns the removal method.

[0002]

2. Description of the Related Art Generally, in equipment that handles cement and cement mixture, adhered cement is removed in order to prevent deterioration of its function. As such a device, for example, as shown in FIG. 1, a dehydration treatment device for sludge in which cement is mixed is known.

This dehydration treatment apparatus 1 comprises a supply pipe 2 to which sludge mixed with cement is pressure-fed, a treatment chamber 3 connected to an end of the supply pipe 2 on the downstream side, and this treatment chamber. A pair of filters 4 disposed on a pair of opposing wall portions of 3
And a drainage channel 5 provided on the opposite side of the processing chamber 3 of each filter 4, and a drainage channel 6 connected to these dehydration channels 5 for discharging the removed water to the outside of the apparatus. A vacuum pump (not shown) that draws water from the sludge in the treatment chamber 3 by connecting the drain pipe 6 to a vacuum state is connected to the drain pipe 6.

In such a dehydration treatment apparatus 1, sludge mixed with cement is fed into the treatment chamber 3 via the supply pipe 2 as shown by an arrow (a) in FIG. The drainage conduit 6 is held in a vacuum state. As a result, the sludge is allowed to pass through the filters 4 and is discharged to the outside of the apparatus through the dehydration channel 5 and the drainage pipeline 6 as shown by the arrow (b) in FIG. At this point, the cement and other solid matter W mixed in are removed.

Then, in the dehydration processing apparatus 1,
As the sludge is dehydrated, the solid W mixed with dehydrated cement is condensed in the treatment chamber 3 and the solid W is removed, and then the washing water for the filter 4 is removed. Is performed, and the dehydration process and the cleaning process are repeated.

By the way, in the above-mentioned filter 4, the solid matter W adheres due to the adhesive force of the cement mixed in even after the washing treatment of the solid matter W. By repeating the above-mentioned dehydration treatment and washing treatment, The solids W are accumulated and adhered, and the mesh of the filter 4 is clogged as shown in FIG.

Therefore, conventionally, it has been attempted to remove the solid matter W adhering from the filter 4 by rubbing the filter 4 with a brush in addition to the cleaning treatment.

By the way, in the above-mentioned dehydration treatment, the drainage pipe 6 side is kept near atmospheric pressure, and the sludge is forced into the filter 4 from the supply pipe 2 at a predetermined pressure to pass the sludge through the filter 4. It is also considered to do so.

[0009]

However, even when the solid W is removed by the conventional processing method as described above, as shown in FIG. 3, the solid W is removed so that the mesh can be seen. Although it can be removed,
There is a problem that the removal effect is not sufficient and the number of reusable times is limited. The defects caused by such cement deposits are not limited to the dehydration treatment device 1 described above, and also occur in devices that handle cement, such as concrete pumps and mixer trucks.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a method for removing cement deposits which can surely remove cement deposits.

[0011]

The method for removing cement deposits according to claim 1 of the present invention is a removal method for removing cement deposits adhering to an object in order to achieve the above-mentioned object. Therefore, after spraying cleaning water onto the cement deposits and performing preliminary cleaning, spraying an acidic liquid on the remaining cement deposits, and then spraying cleaning water onto the object to remove the residual cement deposits. It is characterized by doing. Here, dilute hydrochloric acid is preferably used as the acidic liquid.

According to the method for removing cement deposits according to claim 1 of the present invention, rough cement deposits are removed by preliminary washing with washing water, and then Ca component of cement is obtained by spraying an acidic liquid. The cement dissolves due to the reaction between the cement and the acid, whereby the adhesive force between the cement deposit and the object is lost, and the cement deposit is easily removed.

The method for removing cement deposits according to claim 2 of the present invention is a method for removing cement deposits adhering to an object loaded in a container.
The acid liquid is filled in the container to such an extent that the object is immersed, and the product is immersed in the container for a predetermined time, then, after the acidic liquid is extracted from the container, the washing water is circulated in the container, so that the cement adhered to the object. It is characterized by removing deposits. Examples of the container include a container of a dehydration treatment device for sludge in which cement is mixed.

According to the method for removing cement deposits according to the second aspect of the present invention, the Ca component of the cement is prepared by immersing the object with the cement deposits in the acidic liquid filled in the container for a predetermined time. The reaction of the acid with the acid dissolves the cement, which results in a weak or even weak adhesion between the cement deposit and the object, and then
By circulating the wash water through the container, cement deposits are easily removed from the object.

According to a third aspect of the present invention, in the method for removing cement deposits according to the second aspect, the object is a filter for capturing the cement deposits. This filter is a metal wire mesh made of stainless steel and having a size capable of capturing the cement deposit, and is installed in the container of the dehydration treatment apparatus for sludge in which cement is mixed.

According to the method for removing cement deposits according to the third aspect of the present invention, the Ca component of the cement is prepared by immersing the filter in which the cement deposits are attached to the acidic liquid filled in the container for a predetermined time. The cement dissolves due to the reaction of the acid with the acid, which causes the adhesive force between the cement deposit and the filter to be lost or considerably weakened. As it flows through the filter and passes through the eye of the filter, cement deposits are easily removed from the filter.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an example in which the embodiment of the present invention is applied to the filter 4 of the dehydration treatment apparatus 1 for sludge in which the above-mentioned cement is mixed will be described.

[0018] First, performed repeatedly dehydration <br/> treatment of sludge in the dehydration treatment apparatus 1, filtering capacity is reduced to below the allowable range. In this state, the filter 4 has the structure shown in FIG.
As shown in, there is a large amount of cement deposits (solid W).

From this, by prewashing the filter 4 with cleaning water, as shown in FIG. 3, the solid matter W having a weak adhesive force is removed. As a result, the solid matter W is roughly removed.

Next, while adding hydrochloric acid as an acidic liquid to the cleaning water to generate diluted hydrochloric acid, the diluted hydrochloric acid is sprayed onto the filter 4 which has been preliminarily cleaned, and then the cleaning water is further sprayed on the object. As a result of performing such a treatment, the solid matter W attached to the filter 4
However, as shown in FIG. 4, most of them were removed, and good results were obtained. It is considered that this is because the cement is dissolved by the reaction of Ca ions, which are the components of the cement, with hydrochloric acid, and the adhesive force between the solid matter W and the filter 4 is lost.

Further, the washing with the washing water after spraying the dilute hydrochloric acid prevents the filter 4 from being violated by the unreacted dilute hydrochloric acid.

Incidentally, the spraying pressure of the washing water used for the treatment, the kind and the concentration of the acidic liquid, etc. can be variously changed based on the properties of the sludge to be treated, the material of the filter 4 and the like.

Next, as another example of the embodiment of the present invention, a method for removing the solid matter W adhering to the filter 4 with the filter 4 still installed in the container 7 of the dehydration treatment apparatus 1 will be described. To do. The container 7 of the dehydration processing apparatus 1 is a container that forms the dehydration path 5 with the processing chamber 3, and the processing chamber 3 and the dehydration path 5 are provided in the container 7. The supply pipe 2 is connected to the upper part of the container 7, and the drain pipe 6 is connected to the lower part.

First, when the sludge dewatering process in the dewatering apparatus 1 is repeatedly performed and the filtering capacity reaches the allowable range or less, that is, when the solid matter W adheres to the filter 4 to cause clogging. Then, dilute hydrochloric acid is introduced from the drainage pipe 6 to fill the container 7 to such an extent that the filter 4 is immersed therein, as shown in FIG. The solid matter W condensed in the processing chamber 3 is removed before the dilute hydrochloric acid is filled. And
The filter 4 is immersed in dilute hydrochloric acid for a predetermined time. Then, the cement is dissolved by the reaction of Ca ions, which are the components of the cement, with hydrochloric acid, and the adhesive force between the solid W and the filter 4 is lost or considerably weakened, and a part of the solid W is partially removed. It peels off from the filter 4, and the rest adheres to the filter 4 in a state of being easily peeled off.

Next, the dilute hydrochloric acid filled in the container 7 is extracted from the drainage line 6. At this time, the solid matter W peeled off from the filter 4 is accumulated in the processing chamber 3.
After that, as shown in FIG. 6, the washing water is introduced into the container 7 from the drainage pipe 6 and is caused to flow out from the supply pipe 2, so that the washing water is introduced into the container 7 from below as indicated by an arrow. Distribute on top. At this time, the washing water passes from the dehydration passage 5 through the eyes of the filter 4, passes through the processing chamber 3 and the supply pipe 2
The solid matter W that adheres weakly to the filter 4 adheres to the inner surface of the filter 4,
When the wash water passes through the filter 4 from the outside to the inside, the solid matter W weakly attached to the filter 4 is peeled off and is carried on the flow of the wash water to be discharged from the supply pipe line 2 and, at the same time, the processing chamber. The solid matter W accumulated on the filter 3 also rides on the flow of the washing water and is discharged from the supply pipe line 2, whereby most of the solid matter W adhering to the filter 4 is removed, and the filter 4 is removed. To be washed.

In this way, the solid W is filtered by the filter 4
If it is removed from the filter 4, the filter 4 becomes
Since it is not necessary to remove the solid W, it is easy to remove the solid W, and automation can be achieved.

[0027]

As described above, according to the first aspect of the present invention.
The method for removing cement adhering matter according to 1, is a removing method for removing cement adhering to an object, and after performing pre-cleaning by spraying cleaning water onto the adhering cement, the remaining adhering cement is acidified. It is characterized by spraying a liquid and then spraying washing water on the object to remove the remaining adhered cement, and has the following excellent effects.

Preliminary washing with washing water removes rough cement deposits, and then spraying an acidic liquid eliminates the adhesive force between the cement deposits and the object, and easily removes the cement deposits. it can.

Further, by washing again with washing water,
It is possible to prevent the unreacted acidic liquid from adversely affecting the object and prevent the occurrence of defects such as corrosion of the object.

Further, according to the method for removing cement deposits according to the second aspect of the present invention, the object with cement deposits is immersed in the acidic liquid filled in the container for a predetermined period of time so that the cement deposits. The adhesion between the kimono and the object is lost or becomes weak, and then the cement adhering matter can be easily removed from the object by circulating the washing water through the container. Can be performed in a state where it is installed without taking out the object from the container, so that the solid matter can be easily removed and can be automated.

According to the method for removing cement deposits according to the third aspect of the present invention, since the object is the filter in the second aspect, when the washing water is passed through the container, this washing water is As it flows over the surface and passes through the eyes of the filter, cement deposits can be easily removed from the filter.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

FIG. 1 shows an example of equipment for handling cement,
It is a longitudinal cross-sectional view of a main part of a dehydration treatment apparatus for sludge in which cement is mixed.

Front page continued (72) Inventor Kenichi Takiguchi 2-10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Co., Ltd. (72) Masanori Fukuyama 2--10-10 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd.

Claims (3)

[Claims] 1. A removal method for removing cement deposits adhering to an object, which comprises spraying cleaning water onto the cement deposits to carry out preliminary cleaning, and then applying an acidic liquid to the remaining cement deposits. A method for removing cement deposits, which comprises spraying and then spraying washing water onto the object to remove residual cement deposits. 2. A removing method for removing cement deposits adhering to an object loaded in a container, wherein the container is filled with an acidic liquid to such an extent that the object is immersed, and then immersed in the container for a predetermined time, A method for removing cement deposits, characterized in that after removing the acidic liquid from the container, washing water is circulated in the container to remove the cement deposits adhering to the object. 3. The method for removing cement deposits according to claim 2, wherein the object is a filter for capturing the cement deposits.