JPH06158369A - Method for recovering and utilizing water-soluble degreasing and washing liquid - Google Patents

Abstract

PURPOSE:To effectively utilizing a treating agent by recovering this treating agent at a high recovery rate without discharging polluting materials from a treating line at the time of a degreasing treatment. CONSTITUTION:The water-soluble degreasing and washing liquid is recovered by heating the water-soluble degreasing and washing liquid of a high concn. in a water-soluble degreasing and washing tank A to a high temp. to evaporate moisture and to decrease the bulkiness of the water-soluble degreasing and washing tank A and returning a part of the washing liquid from the degreasing and washing tank A and plural pieces of subsequent rinsing tanks B1, B2, to the immediate previous degreasing and washing tank A or the immediate previous rinsing tank.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention surely removes oil components adhering to parts during quenching of metals and other processing, and at the same time, the detergent used at that time is washed without leaking to a processing tank. The present invention relates to a method for recovering and utilizing a water-soluble degreasing cleaning liquid.

[0002]

2. Description of the Related Art Conventionally, the removal of the quenching martemper oil adhered during the quenching treatment of metal parts consists of one or two cleaning tanks, and the first tank contains a low-concentration detergent of about 5%. Is stored, and pure water is constantly supplied to the second tank (or after that in the case of multiple tanks) so that the object to be cleaned is immersed or washed by a shower. In addition, in general degreasing of pressed parts, as shown in Fig. 3, the oil adhering to the processed parts is removed by immersing it in the high-concentration alkaline cleaning solution tank A and boiling it through air to energize it. , cleaning tank B in the next few stages _'1, B' _2, ...
After that, the shower C is washed with water to finish.

[0003]

However, in the former conventional example described above, the number of washing tanks is small, and the detergent concentration is 5
Since a detergent with a low concentration of about (%) is used, the cleaning ability is weak and forced to build a bath of the cleaning liquid in a short period of time. Not only are these operations not easy, but due to pollution problems, the expenses required for treating old liquids and the consumption of cleaning liquids are large, which is extremely uneconomical. In addition, it is difficult to completely degrease grease-like oil with high viscosity,
As a result, they depended on organic solvents such as triethane and trichlene.However, these organic solvents will cause the destruction of the local environment due to the generation of ozone holes and underground infiltration. Therefore, there is a tendency to prohibit the use of the entire surface, and the treatment with this kind of organic solvent has a high cleaning cost. In the latter example shown in FIG. 3, the high-concentration alkaline detergent in the cleaning tank A is taken out to the cleaning tank B ′ ₁ and further diluted with the cleaning water in the next cleaning tank B ′ ₂ ; Although it is diluted every time it passes through each washing tank, the washing water overflows from the final washing tank of the washing process to the first washing tank, so that the washing water is contaminated. The degree of cleaning is gradually diluted along the traveling direction of the object to be cleaned, and becomes close to that of pure water in the final cleaning tank, so that good results can be obtained in terms of cleaning. However, since all the polluted water generated in the cleaning process flows into the first cleaning tank, the contamination of the cleaning water in the first cleaning tank is not diluted, and moreover, it is always constant for good cleaning. Since a large amount of pure water is being supplied, the contaminated water constantly overflows from the earliest cleaning tank and becomes a so-called spillage condition, which is a pollution problem as it is and requires an exclusion facility to detoxify and release it. There was a problem that the equipment and facilities cost a lot of money.

[0004]

[Means for Solving the Problems] A degreasing cleaning tank in which a water-soluble high-concentration detergent is stored, and a cleaning method for cleaning detergent attached to an object to be cleaned 1
In a cleaning method using a warm water rinse tank composed of one or more tanks, the cleaning liquid in the degreasing cleaning tank is heated to evaporate water to condense it, and the cleaning hot water in the rinse tank is After returning to the degreasing cleaning tank, the final rinse tank is supplemented with pure water so that the cleaning water is kept at a low concentration.

[0005]

[Function] By heating the water-soluble cleaning liquid in the degreasing cleaning tank to evaporate and condense the internal water content and reduce the bulk of the cleaning liquid to a certain amount, and to clean the warm water in the warm water rinse tank into the degreasing cleaning tank. At the same time as returning to the degreasing cleaning tank, the amount of pure water equivalent to the amount returned to the degreasing cleaning tank is replenished in the warm water rinse tank to suppress the increase in the degree of contamination in the rinse tank and to collect the detergent without flowing it out. .

[0006]

EXAMPLES The method of the present invention will now be described in detail with reference to the examples shown in the drawings. As shown in FIG. 1, a water-soluble cleaning solution having a detergent concentration of 20% (range of 10 to 30%) is added,
Moreover, a degreasing cleaning tank A configured to heat the cleaning liquid,
Rough rinsing tank B ₁ containing the hot water, consisting of finishing the rinsing tank B ₂ Metropolitan for further washing the object to be cleaned by washing with crude rinsing tank B _1. In the above example, the rinsing tank is a two tank type, but the present invention is not limited to this, and more tanks may be used. In the figure, reference numeral a indicates each degreasing cleaning tank and a floating oil recovery device provided in each rinsing tank, and the cleaning liquid in each rinsing tank B ₁ , B ₂ is appropriately heated and uses hot water. The same applies to the case of multiple tanks. Next, a series of cleanings will be described. First, the cleaning object (high-concentration alkaline degreasing agent) heated to 80 (° C) or higher in the degreasing cleaning tank A is immersed in the object to be cleaned with martemper oil and the like and shaken. Or rinse with a shower or a barrel, and then put the object to be cleaned in the next coarse rinse tank B ₁ and wash it by shaking or shower as before, and further rinse the object to be cleaned with a finishing rinse tank. Transfer to B ₂ and wash as above. When the object to be cleaned is continuously supplied and cleaned in the above cleaning process, the cleaning liquid in the degreasing cleaning tank A gradually decreases in volume due to evaporation and carry-out due to high temperature. However, in the coarse rinse tank B ₁ or less, the cleaning concentration is small. The cleaning liquid gradually increases, and in the final stage of the cleaning line, the cleaning liquid having a higher concentration is taken out and overflowed continuously due to overflow. Therefore, wherein the degreasing cleaning bath A, supplementing the loss at the same time recovering the detergent by returning draw considerably reduced amount of takeout of the crude rinsing tank B ₁ from crude rinsing tank B _1. As a result, since the bulk of the rough rinse tank B ₁ is reduced by pumping back to the degreasing cleaning tank A, the cleaning liquid is pumped back from the finish rinse tank B _{2 by the} amount equivalent to this pumping back as in the previous time. Therefore, since the bulk of the cleaning liquid as well even finishing rinsing tank B ₂ is reduced, but washing the finishing rinse tank B ₂ (final cleaning tank) in replenish pure water considerable amount to suppress the increasing detergent concentration乍Ra The experimental result is as shown in FIG. That is, the table in the figure shows that the carry-out amount between each tank is 10
(%) And the detergent concentration in the degreasing cleaning tank A is 10 (%), 20
(%) And 30 (%) were measured for the detergent concentration in each rinse tank when set to three ways respectively. As is clear from this, the change in the detergent concentration in each rinse tank was set in advance. It surely decreases at a rate of 10 (%) according to the amount taken out, so if more rinse tanks are connected in series, the concentration will endlessly decrease, and the loss of detergent and pollution problems can be solved. . As described above, by keeping the temperature of the degreasing cleaning tank at a high temperature, the water content is constantly evaporated to reduce the volume of the degreasing solution, and the degreasing solution is concentrated. By sequentially returning the cleaning liquid from the bath, it is possible to prevent the outflow of the liquid due to the overflow from the final rinse bath. The amount of evaporation in the degreasing cleaning tank can be arbitrarily changed by changing the heating temperature.

[0007]

As described above, the present invention increases the liquid temperature of the degreasing / cleaning tank to constantly evaporate water to reduce the amount of the liquid, thereby concentrating the degreasing liquid, and reducing the amount of the succeeding rinse tank. It is returned in order from the beginning, and pure water is replenished in the final rinse tank to suppress the increase in concentration for cleaning, and the detergent recovery rate in the degreasing cleaning tank is 90 (%) or more, which is a great economic effect. can get. Further, since a part of the cleaning liquid in the subsequent rinse tank is constantly returned to the front rinse tank, the waste liquid from the final rinse tank is eliminated, and as a result, the waste liquid treatment equipment is not required as before. Further, the floating oil component can be recovered by a recovery device, separated and refined, and reused as a fuel. Furthermore, since the detergent is collected in the degreasing / cleaning tank, the concentration is high, and the degreasing of the highly viscous oil component, which is difficult to remove, can be facilitated. It also has many effects such as elimination of waste liquid containing detergent and elimination of pollution problems such as pH and COD.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an example of an apparatus for carrying out the present invention.

FIG. 2 is a table showing how the density decreases.

FIG. 3 is a schematic side view of a conventional device.

[Explanation of symbols]

A Degreasing cleaning tank B ₁ Coarse rinsing tank B ₂ Finishing rinsing tank a Oil recovery device

Claims (1)

[Claims] 1. A degreasing cleaning tank in which a cleaning liquid having a concentration of a water-soluble detergent of a certain value or more is charged and heated to be concentrated, and one or more of a plurality of detergents attached to the article to be washed are washed with water. In a cleaning method using one hot water rinse tank, a part of the cleaning liquid in the subsequent hot water rinse tanks adjacent to each other is fed back to the degreasing cleaning tank or the immediately preceding rinse tank at the same time as the final hot water rinse tank. A method for recovering and utilizing a water-soluble degreasing cleaning liquid, characterized in that the contamination of the warm water rinsing tank is maintained at a low concentration by supplementing the pure water with pure water.