JP2005040734A - Method for separating oil-mixed alkaline liquid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for separating an oil-mixed alkaline liquid in high efficiency at a comparatively lower cost from waste alkaline liquid used for washing/removing oil by using the waste alkaline liquid as the object to be treated. <P>SOLUTION: In a case A, one tank 1 is arranged for housing the oil-mixed bubbled alkaline liquid. In a case B, a plurality of the tanks 1 are arranged. In the case A, the tank 1 is provided with a treating machine 2 for defoaming the oil-mixed bubbled alkaline liquid in the tank 1 and discharging the defoamed liquid phase or the tank 1 is provided with the same treating machine 2 and a bubbling machine 5. In the case B, each of the tanks 1 is provided with the same treating machine 2 and the bubbling machine 5, and a treated liquid discharging pipe 44 extended from the treating machine 2 of the preceding tank 1 is connected to the succeeding tank 1. The oil-mixed alkaline liquid is separated from the waste alkaline liquid used for washing/removing oil by using the tank(s) 1 mentioned in the case A or B. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method of separating an alkaline liquid mixed with oil from an alkaline liquid used for oil removal washing, for example, an alkaline liquid obtained by washing a strip in the steel industry. Here, “separation” does not mean “separation” in a strict sense, but has a meaning as described later. This also applies to the present invention, and the same applies to other parts such as the title of the invention and the claims.

  Conventionally, separation of the oil-mixed alkaline liquid for the object to be treated as described above is generally performed by filtration.

  This prior art has poor separation efficiency of oil-mixed alkaline liquid. In addition, the filter medium used for separating the oil-mixed alkaline liquid is clogged in a short time and loses the filtration function. Therefore, it is necessary to replace the filter medium with a new one relatively frequently, resulting in high costs.

  The present invention aims to provide a method for separating an oil-mixed alkaline solution that solves the above-described problems of the prior art and can perform separation of the oil-mixed alkaline solution with high efficiency and achieve this at a relatively low cost. .

  The above prior art has poor separation efficiency of the oil-mixed alkaline liquid. In addition, the filter medium used for separating the oil-mixed alkaline liquid is clogged in a short time and loses the filtration function. Therefore, it is necessary to replace the filter medium with a new one relatively frequently, resulting in high costs.

  The present invention aims to provide a method for separating an oil-mixed alkaline solution that solves the above-described problems of the prior art and can perform separation of the oil-mixed alkaline solution with high efficiency and achieve this at a relatively low cost. .

  In order to solve the above problems, the present invention adopts the following specifications for the separation of the oil-mixed alkaline liquid from the alkali liquid to be treated.

  1. A tank for storing and treating the foamed alkaline liquid mixed with oil is provided with a processing device for erasing the foam of the oil mixed foamed alkaline liquid in the tank and discharging it to the outside of the tank in the form of droplets or liquid phase. Specification to which a thing is applied (corresponding to the one described in claim 1).

  As a processor in the specification of 1, the following can be given as a preferred example. The impeller rotates in a casing having a suction pipe leading to the foam phase inside the tank to be treated and a drain pipe leading to the outside of the tank. Is discharged by colliding with the inner peripheral surface of the casing by centrifugal force to erase the liquid droplets or liquid phase generated by the defoaming. The same applies to the processor in the specification described below.

  2. In the specification shown in the preceding specification, a specification that substantially applies a closed type tank to the foamed alkaline liquid mixed with oil (corresponding to the one described in claim 2).

  3. In the specification shown in the preceding specification, a specification (corresponding to claim 3) is applied to a tank that contains a bubbling alkaline liquid mixed with oil, with an open type.

  4). Fill the tank containing the foamed alkaline liquid mixed with oil with a processor having the same function as in the specification of the preceding 1 and with a foamer, and add the foamed alkaline liquid mixed with oil in the tank to the tank. A specification in which the foam of the oil-mixed foamed alkaline liquid is removed from the tank in the form of a liquid drop or liquid phase and discharged out of the tank while being foamed by a whisk. As a whisk in the specification of No. 4, a circulation pump can be cited as a preferred example. The same applies to the whisk in the specifications described below.

  5. In the specification of the preceding 4 specification, a tank with an extraction tube for extracting the treated liquid in the tank is allocated to the tank containing the foamed alkaline liquid mixed with oil (corresponding to claim 5). .

  6). The tanks containing the foamed alkaline liquid mixed with oil are primary, secondary and multiple connected, and each of these tanks is filled with a processor and a whisk with the same function as in the specification of the preceding 1 In the tank, the oil-mixed foaming alkaline liquid in the tank is foamed by the whisk, while the oil-mixed foaming liquid is erased by the processor and discharged to the outside of the tank as a droplet or liquid phase. Specification for progressively treating the liquid to be treated by the preceding connection (corresponding to claim 6). The specification of 6 corresponds to a combination of a plurality of the specifications of the preceding 4.

  7). In the specification shown in the preceding 6, the specification is equivalent to filling each tank containing the bubbling alkaline liquid mixed with oil with an extraction pipe for extracting the processed liquid inside (corresponding to the one described in claim 7).

  8). The tank containing the bubbling alkaline liquid mixed with oil is at least primary, secondary, and tertiary connected to each other, and the primary tank is filled with a processor with the same function as in the specification shown in the preceding 1 Subsequent tanks are filled with a processor and a foamer having the same functions as in the specification of the preceding 1 and in the primary tank, the oil-mixed foamed alkaline liquid bubbles in the tank are erased by the processor. Or the liquid phase is discharged to the outside of the tank. In each of the secondary and subsequent tanks, the oil-mixed foamed alkaline liquid in the tank is foamed with the whisk, while the oil-mixed foamed alkaline liquid foam is removed. A specification in which the treatment liquid is discharged from the tank in the form of an extinguished droplet or a liquid phase, and the treatment liquid is progressively treated as shown in FIG. Equivalent). These 8 specifications correspond to those obtained by merging the specifications 1 and 6 shown above.

  9. In the specification shown in the above-mentioned 8, the specification of the secondary and subsequent tanks is applied with one having an extraction pipe for extracting the processed liquid in the tank (corresponding to the one described in claim 9).

  According to the previous specification, the following results are obtained.

  Specification 1: Bubbles of foamed oil-mixed alkaline liquid in the tank are extinguished by the processor and discharged out of the tank in the form of liquid. The discharged liquid was put in an appropriate container and allowed to stand until the scum was released on the liquid surface. When the oil content was examined, it was found that it was higher than the oil content of the alkaline liquid before treatment in the tank. . By the way, in the experimental results of the alkaline solution that washed the strip in the iron and steel industry, the oil content of the treatment liquid (the liquid from which the scum in the container is released) is about three times that of the undiluted solution (the liquid before the treatment). The oil content of the upper scum was about 24 times the stock scum. This means that the alkaline liquid treated in the present invention was concentrated considerably in oil content in both the liquid phase and the scum phase. Thus, when the oil-mixed alkaline solution is processed in the present invention, the stock solution is separated from the oil-mixed alkaline solution by an increase in the oil content of the processing solution. This is why the method according to the present invention is referred to as an oil-mixed alkaline liquid separation method. The fact that the oil content of the treatment liquid is considerably higher than that of the stock solution is a proof that the separation efficiency of the oil-mixed alkaline liquid is good.

  In one specification, the tank is more useful when the tank is substantially closed (2 modified types) than when the tank is open (3 modified types). Details are as follows.

  The oil-mixed alkaline liquid has good foaming, and the thickness of the foam phase on the liquid surface is considerably large. In order to transfer such a foam phase to the defoaming discharge processor, a suction method is suitable, and high suction efficiency is desired. The closed tank responds to this. When the tank is a closed type, the outside air is less sucked, the foam phase is sucked efficiently, and the separation efficiency of the oil-mixed alkaline liquid is higher than when the tank is opened.

  Specification 4: The process is carried out by removing the foam of the oil-mixed alkaline liquid in the tank and removing it from the tank in the form of droplets or liquid phase by a processing device. That is, the specification 4 is in line with the specification of 1 in the processing. Therefore, a good oil-mixed alkaline liquid separation result can be obtained.

  The tank is equipped with a whisk and a defoaming discharge treatment device, and it is possible to carry out the defoaming and discharging of the oil-mixed alkaline liquid in the tank and the defoaming and discharging of the foam of the oil-mixed alkaline liquid in the tank. The foaming result and the defoaming discharge result can be adjusted to an appropriate level.

  Specification 5: Corresponds to the modified type 4 plus an extraction tube for extracting the processed liquid in the tank. Therefore, the advantage obtained by the recovery of the processing liquid by the extraction tube is added to the results obtained with the four modified types.

  Specification 6: Corresponds to a combination of a plurality of specifications 4 shown above. Therefore, the obtained result corresponds to a combination of a plurality of specifications of 4 specifications. In addition, since the plurality of units are connected in series in the connection process of the oil-mixed foamed alkaline solution, the separation result of the oil-alkaline solution is progressively increased.

  7 specification: This corresponds to the specification of 6 and an extraction tube for extracting the processed liquid in the tank. For this reason, the advantage obtained by collecting the processing liquid by the extraction tube is added to the result obtained with the specification of 6.

  8 specification: This is equivalent to the merged specification of the previous 1 and 6 specifications, so that the result of merging the results of the 1 and 6 specifications is obtained.

  9 specification: It corresponds to the specification of 8 and an extraction tube for extracting the processed liquid in the tank. Therefore, the advantage obtained by collecting the processing liquid by the extraction tube is added to the result obtained with the specification of 8.

  In the present invention, a tank having a required function processor and a whisk is used. In addition to being able to adjust the above-mentioned foaming results and defoaming discharge results, this has the following significance.

  If the progress of foam treatment in the tank exceeds a certain level, the function of the processor becomes excessive. This means that the mechanical efficiency of the processor is reduced. This is supplemented by the addition of a whisk.

  As described above, in the present invention, the oil-mixed alkaline liquid can be efficiently separated without using filtration. For this reason, there is an advantage that the desired oil-mixed alkaline liquid separation can be achieved at a relatively low cost. In addition, the high separation efficiency of the oil-mixed alkali liquid is accompanied by the following advantages.

  In general, the alkaline solution used for cleaning the oil drop is reused. It is desirable that the alkaline liquid to be reused has a low oil content. The present invention is significant because the separation efficiency of the oil-mixed alkaline liquid is high.

  Embodiments of the present invention will be described together with examples with reference to the drawings showing an example of an apparatus used for carrying out the method of the present invention. An example of an apparatus used for carrying out the method of the present invention according to claims 1 to 9 is shown generally in FIG. An example of an apparatus used for carrying out the method of the present invention according to claims 1 to 3 is the one shown in FIG. 1 in which the upper right and lower two upper tanks and the equipment and piping associated therewith are omitted (the two stages). (Excluding piping extending from above to the upper tank). An example of an apparatus used for carrying out the method of the present invention according to claims 4 and 5 is shown in FIG. 2 (enlarged view of the upper and lower two-stage tank portion in the lower right of FIG. 1). And the equipment and piping associated therewith are omitted. An example of an apparatus used for carrying out the method according to claims 6 and 7 is shown in FIG. An example of an apparatus used for carrying out the method according to claims 8 and 9 is shown in FIG. In the figure, reference numeral 1 denotes a tank for containing or receiving oil-containing foamed alkaline liquid.

  In the apparatus used for carrying out the method of the present invention according to claims 1 to 3, a single tank 1 is applied, and the tank 1 is used to eliminate the bubbles of the oil-mixed and bubbling alkaline liquid in the interior of the tank. A processing device 2 is provided for discharging to the outside of the tank as a phase.

  In the apparatus used for carrying out the method of the present invention according to claims 4 and 5, one tank 1 is installed, and the bubbles of the oil-mixed foamed alkaline liquid in the tank are removed to form the same liquid droplet or liquid phase. A processing device 2 that discharges to the outside of the tank and a whisk 5 such as a circulation pump are attached.

  In the apparatus used for carrying out the method of the present invention according to claims 6 and 7, two tanks 1 are provided side by side, and in each of these tanks, the bubbles of the oil-mixed foamed alkaline liquid in the tank are erased and the droplets or liquids are removed. A processing device 2 for discharging to the outside of the tank as a phase and a whisk 5 are attached.

  In the apparatus used for carrying out the method of the present invention according to claims 8 and 9, the tank 1 is provided with three primary, secondary, and tertiary units, and the primary tank (the uppermost tank in FIG. 1) is provided in the tank. A processing device 2 is attached to eliminate bubbles of oil-blended alkaline liquid and to discharge liquid droplets or liquid phase outside the tank, and a secondary tank (second tank from the top in FIG. 1) and a tertiary tank ( In FIG. 1, the processing tank 2 for removing the foam of the oil-mixed foamed alkaline liquid in the tank and discharging it out of the tank in the form of droplets or liquid phase, and the whisk 5 It is attached.

  The processor 2 has a structure as shown in FIG. 3 (a cross-sectional enlarged view taken along line AA in FIG. 1) and FIG. 4 (a right-end enlarged view in FIG. 3), and includes a bubble eraser 4. The foam extinguisher 4 includes a casing 41, an impeller 42 provided in the casing 41, a suction pipe 43, and a drain pipe 44. The casing 41 has a discharge port 45 on a peripheral wall of a portion that is out of a location corresponding to the impeller 42. The impeller 42 is driven by the motor M via the transmission belt B. The defoamer 4 is installed in a processing chamber 3 for defoaming the bubbles of the oil-mixed foamed alkaline solution in the tank 1, and the processing chamber 3 is located above the tank 1. The starting end of the suction pipe 43 of the foam extinguisher 4, that is, the suction port 430 reaches the foam phase region of the oil-mixed alkaline liquid surface in the tank 1. The processing chamber 3 has an air exhaust port 31 at a location adjacent to the bubble eraser 4. The tank 1 may be substantially closed or open. The processing chamber 3 is a duct type extending horizontally, and two foam extinguishers 4 are provided apart from each other.

  The tank 1 for containing or receiving the oil-mixed foaming alkaline liquid is provided with a primary, secondary, and a plurality of units (Claims 6 and 7), and a primary, secondary, tertiary, and a plurality of units are provided (Claim 8). And 9), the end of the drain pipe 44 of the processing device 2, that is, the liquid outlet 440, which removes the foam of the oil-mixed alkaline liquid in the tank and discharges it to the outside of the tank as a droplet or liquid phase, From the tank to the secondary tank, or from the primary tank to the secondary tank, and from the secondary tank to the tertiary tank, it is connected to the adjacent tank. When a plurality of tanks 1 are juxtaposed, the end of the drain pipe 44 of the processor 2 in the final tank may be connected to a tank 10 that collects the final processing liquid obtained by processing bubbles.

  When the tank 1 is provided with an extraction pipe 11 for extracting the processed liquid in the tank, the extraction pipe 11 is better in that the siphon pipe can keep the liquid level in the tank 1 at a constant height. When the liquid level in the tank 1 is kept constant, the bubble suction operation of the processing unit 2 in other words, the separation process of the oil-mixed alkaline liquid is stabilized. The extraction pipe 11 is connected to a treatment liquid recovery tank (not shown) when one tank is connected, and when a plurality of tanks are connected, the extraction pipe 11 of each tank is connected to the collection pipe 13 and the end of the collection pipe 13 is collected. It may be connected to the tank 12. If necessary, the recovery tank 12 is connected to the first tank 1 via a liquid feeding pipe 15 having a liquid feeding pump 14.

  When the impeller 42 is driven, the foam phase of the oil-mixed foamed alkaline liquid in the tank 1 is sucked into the foam eraser 4 of the processor 2 through the suction pipe 43, and the centrifugal force generated by the rotation of the impeller 42 causes the casing to It collides with the 41 peripheral surface and is defoamed to become a droplet or liquid phase, falls into the processing chamber 3 through the discharge port 45 on the peripheral wall of the casing 41, and is discharged out of the processing chamber 3 through the drain pipe 44. The discharged liquid is collected in a collecting tank (not shown) when there is one tank 1, and when the tank 1 is connected to a plurality of tanks, the discharged liquid from the preceding tank is received by the succeeding tank, and the drain pipe of the final tank. The discharged liquid from 44 is collected in the collection tank 10.

It is an elevation view showing an example of an apparatus used for carrying out the separation method according to the present invention. FIG. 2 is a partially enlarged view of FIG. 1. It is an AA line cross-sectional enlarged view of FIG. FIG. 4 is a partially enlarged view of FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid to be processed storage tank 2 Processing device 3 Processing chamber 4 Foam extinguisher 5 Foaming device 11 Extraction pipe 43 Suction pipe 44 Drainage pipe

Claims (9)

An oil-mixed alkaline liquid separation method in which bubbling alkaline liquid mixed with oil is accommodated in a tank for processing, and in the tank, bubbles inside the oil-mixed alkaline liquid are removed to form droplets or liquid phase. A method for separating an oil-mixed alkaline liquid, characterized by filling a tank with a treatment device that is discharged outside the tank. 2. The oil-mixed alkaline liquid separation method according to claim 1, wherein a substantially closed type tank is applied to the tank containing the foamed alkaline liquid mixed with oil. 2. The oil-mixed alkaline liquid separation method according to claim 1, wherein the tank containing the foamed alkaline liquid mixed with oil is filled with an open-type tank. A tank that contains a bubbling alkaline liquid mixed with oil, with a processing device and a frothing device that eliminates the bubbles of the bubbling alkaline liquid mixed with oil in the tank and discharges the liquid or liquid phase outside the tank. And the foamed alkaline liquid mixed with oil in the tank is bubbled with the whisk, while the foamed alkaline liquid mixed with oil is erased with the processor and discharged into the liquid or liquid phase outside the tank. An oil-mixed alkaline liquid separation method characterized by the above. 5. The oil-mixed alkaline liquid separation method according to claim 4, wherein the tank containing the foamed alkaline liquid mixed with oil is filled with the one having an extraction pipe for extracting the treated liquid in the tank. Alkaline liquid separation method. The tanks containing the bubbling alkaline liquid mixed with oil are connected to a plurality of primary, secondary, and plural tanks, and in each of these tanks, the bubbles of the oil mixed bubbling alkaline liquid in the tank are erased to form droplets or liquid phases. Filling the tank with a processing device and a frothing device to be discharged out of the tank, while foaming the oil-blown alkaline solution in the tank in each tank with the whisk, A method of separating oil-mixed alkaline liquid, wherein the liquid to be erased or liquid phase is discharged out of the tank and the liquid to be treated is progressively processed by the joint connection of the tank. 7. The oil-mixed alkaline liquid separation method according to claim 6, wherein each of the tanks containing the foamed alkaline liquid mixed with oil is filled with a tank with an extraction tube for extracting the treated liquid inside. Separation method. The tank containing the bubbling alkaline liquid mixed with oil is connected to a plurality of primary, secondary, and tertiary plural tanks, and the bubbles of the oil mixed bubbling alkaline liquid in the tank are removed from the primary tank to form a droplet or liquid phase. Fill the tanks with a processor to be discharged outside the tank, and remove the bubbles of the oil-mixed foamed alkaline liquid in the tanks from the secondary to the outside of the tank in the form of droplets or liquid phase. The primary tank is filled with a processing device and a device equipped with a frothing device, and in the primary tank, the foam of the oil-mixed foamed alkaline liquid in the tank is erased by the processing device and discharged to the outside of the tank as a droplet or liquid phase. In each of the secondary and subsequent tanks, the oil-mixed foamed alkaline liquid in the tank is foamed with the whisk, while the oil-mixed foamed alkaline liquid is erased with the processor to form a droplet or liquid phase. Discharge out of the tank Abura混Ri alkaline liquid separator wherein the progressively performing the processing of the liquid to be treated before 示連 contact tank as. 9. The oil-mixed alkaline liquid separation method according to claim 8, wherein each of the secondary and subsequent tanks is assigned with an extraction tube for extracting the treated liquid in the tank.

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