CN104531325A - Purification method and equipment for waste hydraulic oil of extruding machine - Google Patents

Abstract

The invention discloses a method and equipment for purifying the hydraulic oil of an extruder, which is characterized in that: a fully automatic cleaning method is adopted, including impurity removal, sedimentation, gravity sedimentation, secondary water removal, refining and purification, and the hydraulic oil of the extruder is The oil is operated continuously in a stable transfer pipeline. The purification method and equipment of the hydraulic oil of the extrusion machine of the present invention can achieve a water removal rate of more than 99.99%, without impurities, the quality of the purified hydraulic oil is good, and the recycling rate of the waste hydraulic oil is more than 90%. Simple, high work efficiency, high resource recycling rate, safety and environmental protection.

Description

Purification method and equipment for extruder waste hydraulic oil

technical field

The invention relates to the field of purification of hydraulic oil, in particular to a method and equipment for purifying hydraulic oil of an aluminum alloy extrusion machine.

Background technique

In the aluminum processing industry, hot extrusion is the most common processing method for aluminum alloys, and extrusion machines are the most commonly used equipment for aluminum alloy hot extrusion. During the extrusion process of aluminum alloy, hydraulic oil often leaks from the extruder. Since the hydraulic oil leaked from the extruder contains more water and impurities, it is generally drained directly. In addition, after the hydraulic oil has been used for a period of time, due to mechanical wear, frictional heat aging, rust, contamination (water, solid matter, fuel oil) and other reasons, if these pollutants are not removed in time, it will affect the normal operation of the extruder. Operation and service life, the most common solution is to replace the hydraulic oil in time. The replaced hydraulic oil is generally dumped directly, which not only causes a lot of waste of hydraulic oil, but also produces huge pollution to the environment.

Traditional waste hydraulic oil regeneration methods include chemical refining and filtration. The chemical refining process includes: precipitation, sulfuric acid treatment, heating distillation, clay adsorption, filtration and other process steps. During the chemical refining process, some hydraulic oils and additives may be lost or destroyed. For example, T202 (zinc dialkylthiophosphate), an anti-oxidation, anti-corrosion, and anti-wear additive in hydraulic oil, decomposes above 70°C, producing unpleasant hydrogen sulfate, sulfur dioxide and other toxic gases. The traditional filtration method usually adopts blind end filtration, but there will be a filter cake layer on the filter cloth or filter element, which needs to be cleaned or replaced in time, and is not suitable for continuous operation. In addition, the traditional filtration method does not completely remove the impurities in the waste hydraulic oil, and the quality of the treated oil is poor.

In recent years, the process of regenerating waste hydraulic oil by filtration method has been greatly improved, including the following technologies: high-precision filter element filtration technology: high-precision filter element oil filter device generally adopts a structure that integrates system pressure and purification, that is, it not only provides hydraulic pressure for the hydraulic system. Energy, manipulating the movement of related components, performing performance inspections, and cleaning and purifying the hydraulic system to filter out most of the particle pollutants in the oil. However, this technology also has certain shortcomings, mainly because the service life of the filter element is very short, and the filter element must be replaced frequently during work, which may cause artificial pollution if it is not careful. Moreover, the element type oil filter cannot effectively filter out moisture pollutants and jelly in the oil. In addition, this technology is mainly an online purification technology, which is limited by the working conditions of the main hydraulic system and is not suitable for purification and regeneration of a large amount of waste hydraulic oil.

Electrostatic filtration technology: This technology is mainly based on the characteristics of oil as an insulating fluid, and uses high-voltage static electricity to generate strong adsorption capacity to achieve the purpose of removing pollutants in oil. The outstanding advantages of this method are small pressure difference, strong anti-pollution ability, low noise, and purification effect on various pollutants in the oil. However, the oil purification efficiency of this method is low, the processing capacity is insufficient, and it is difficult to meet the needs of large-scale production.

Centrifugal filtration technology: This technology uses a centrifuge to directly purify the oil. This method has high efficiency in oil treatment, and has a certain ability to remove solid particles such as metal iron filings, but it cannot effectively remove small-sized particle pollutants, and the quality of recycled oil is not high.

With the country's increasing emphasis on environmental protection and petroleum resources, it is imperative to develop a low-pollution, low-energy, high-efficiency and easy-to-operate waste hydraulic oil purification method.

Contents of the invention

The object of the present invention is to overcome the deficiencies of the prior art and provide a method and equipment for purifying hydraulic oil of an extruder with high degree of automation, simple operation, high work efficiency, high resource recycling rate, safety and environmental protection.

In order to achieve the above object, the purification method of extruder waste hydraulic oil of the present invention is characterized in that: a fully automatic purification method is adopted, including impurity removal, sedimentation, gravity sedimentation, secondary water removal, refining and purification, and the steps are as follows:

(1) Impurity removal: Pour the waste hydraulic oil into the filter tank, and remove large particles of impurities in the waste hydraulic oil through the screen of the filter tank. The waste hydraulic pressure is filtered by the filter element at the upper end of the filter tank after preliminary precipitation in the filter tank. Remove fine particle impurities in waste hydraulic oil;

(2) Sedimentation: The filtered waste hydraulic oil enters the sedimentation tank through the filter element at the upper end of the filter tank for static precipitation. The water and impurities in the waste hydraulic oil settle to the bottom and are separated, and the waste hydraulic oil passes through the upper end of the sedimentation tank. The oil outlet enters the secondary sedimentation tank;

(3) (3) Gravity Settling: Pump the settled waste hydraulic oil into the separation tank with a delivery pump for gravity settling to remove water and impurities, and use gravity and heating to remove water and impurities, and the waste in the separation tank The hydraulic oil is heated to 50-60°C to separate the hydraulic oil and water, and the upper layer of pure hydraulic oil is sent to the next process, and the mixture of hydraulic oil and water in the lower layer is returned to the filter tank for recovery and filtration;

(4) Secondary water removal: Start the vacuum pump of the separator, and when the vacuum degree in the separator reaches -0.04MPa or above, pump the hydraulic oil that has undergone gravity settlement into the separator with a transfer pump, and use high-temperature distillation to remove it. Water, the distillation temperature is 100-120°C, and the distillation time is 30-40 minutes;

(5) Refining: Start the vacuum pump of the reactor, and when the vacuum degree in the reactor reaches -0.06MPa or above, send the hydraulic oil that has undergone secondary dehydration into the reactor with a gear pump, and add 15% of the weight of the hydraulic oil into the reactor. preparation, the reaction temperature is 80-90°C, and the reaction time is 10-30 minutes;

(6) Purification: The refined hydraulic oil is sent to the purifier, and the refining agent slag in the hydraulic oil is separated to obtain qualified hydraulic oil.

The above-mentioned refining preparation includes the following raw materials in parts by weight: 2-4 parts of flocculant, 4-8 parts of perlite, and 6-10 parts of modified bentonite.

The preparation method of the above-mentioned modified bentonite is to place the bentonite in a reaction kettle, add a certain amount of modifier sulfuric acid solution, activate it at 80°C for 4 hours under constant temperature stirring, put it to room temperature for suction filtration, and wash with water until the bentonite is completely dissolved. The pH value is greater than 4; then dried, pulverized, and passed through a 200-mesh sieve to obtain modified bentonite.

The flocculant mentioned above includes Tween 80 and ethanol; the weight ratio of Tween 80 and ethanol is 1-2:8-9.

The equipment used in the purification method of extruder waste hydraulic oil of the present invention is characterized in that it includes a filter tank, a sedimentation tank, a separation tank, a separator, a reaction kettle and a purifier, and the filter tank is connected with the sedimentation tank, and the precipitation tank, separation tank, separator, reaction kettle and purifier are connected through pipelines in turn, the filter tank is provided with a screen and a filter element, and the separation tank includes an electric valve, a dirty oil hopper, a sewage pipe and a dirty oil pool , The dirty oil bucket and the oil pool are connected through the sewage pipe, and the electric valve is set on the sewage pipe.

The pipelines of the above-mentioned settling tank and the separation tank as well as the separation tank and the separator are provided with delivery pumps.

The above-mentioned separation tank, separator and reaction kettle are all equipped with heaters.

The top of the above-mentioned separator is provided with a steam outlet.

Both the separator and the reactor described above are provided with a vacuum pump.

The reactor described above is provided with a gear pump and a turbo pump.

Compared with prior art, the beneficial effect of the present invention is:

1. After the purification method of the hydraulic oil of the extruder of the present invention undergoes impurity removal, precipitation, gravity sedimentation, secondary water removal, refining and purification, the water removal rate can reach more than 99.99%, no impurities, and the quality of the purified hydraulic oil is good , The recycling rate of waste hydraulic oil reaches over 90%.

2. The purification efficiency of the extruder hydraulic oil of the present invention is high, the process flow is simple, easy to master, and the purification cycle is short; the waste oil does not undergo processes such as pickling, alkali neutralization, and water washing, and does not produce acid residue, waste water, waste gas, It reduces secondary pollution and achieves good environmental protection effect; the residue produced after hydraulic oil purification can be used to blend asphalt, carbon black, etc., and the flocculation residue is used as release oil for cement products or steel membranes, so that resources can be fully utilized .

3. The modified bentonite of the present invention decolorizes the waste hydraulic oil of the extruder, and the decolorization rate can reach more than 99.0%, and the decolorization effect of the hydraulic oil is obvious.

4. The flocculant and perlite of the present invention can significantly improve the viscosity and viscosity-temperature performance of the hydraulic oil of the extruder, and significantly improve the anti-wear, anti-oxidation and anti-rust properties of the hydraulic oil.

Description of drawings

Fig. 1 is a schematic diagram of the front view of the purification equipment for extruder waste hydraulic oil of the present invention.

Description of the name and serial number of reference signs:

Filter tank 1, screen 2, filter element 3, sedimentation tank 4, separation tank 5, separator 6, steam outlet 7, reactor 8, purifier 9, pipeline 10, electric valve 11, dirty oil hopper 12, sewage pipe 13. Sewage oil pool 14, delivery pump 15.

Detailed ways

The method and equipment for purifying extruder waste hydraulic oil of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Fig. 1, it is the purification equipment of extruder waste hydraulic oil of the present invention, which adopts a fully automatic purification method, including process steps including impurity removal, sedimentation, gravity sedimentation, secondary water removal, refining and purification.

The above-mentioned purification equipment for extruder waste hydraulic oil includes a filter tank 1, a screen 2, a filter element 3, a sedimentation tank 4, a separation tank 5, a separator 6, an exhaust port 7, a reactor 8, and a purifier 9 , pipeline 10, electric valve 11, dirty oil hopper 12, blowdown pipe 13, dirty oil pool 14 and delivery pump 15, described filter tank 1 is connected with settling tank 4, settling tank 4, separation tank 5, separator 6, Reactor 8 and purifier 9 are connected through pipeline 10 successively, and screen cloth 2 and filter element 3 are arranged in described filter tank 1, and described separation tank 5 comprises electric valve 11, dirty oil hopper 12, sewage pipe 13 and sewage The oil pool 14, the dirty oil hopper 12 and the oil pool 14 are connected through the sewage pipe 13, and the electric valve 11 is arranged on the sewage pipe 13, on the pipeline 10 of the described sedimentation tank 4 and the separation tank 5 and the separation tank 5 and the separator 6 A delivery pump 15 is provided, a heater is provided on the separation tank 5, the separator 6 and the reaction kettle 8, and a steam outlet 7 is provided on the top of the separator 6, and the separator 6 and the reaction vessel The kettle 8 is equipped with a vacuum pump, and the reaction kettle 8 is equipped with a gear pump and a turbo pump.

Example 1

Taking the purification of hydraulic oil of aluminum alloy extruder as an example to illustrate the process of the purification method of hydraulic oil of extruder according to the present invention.

(1) Impurity removal: Pour the waste hydraulic oil into the filter tank, and remove large particles of impurities in the waste hydraulic oil through the screen of the filter tank. The waste hydraulic pressure is filtered by the filter element at the upper end of the filter tank after preliminary precipitation in the filter tank. Remove fine particle impurities in waste hydraulic oil;

(2) Sedimentation: The filtered waste hydraulic oil enters the sedimentation tank through the filter element at the upper end of the filter tank for static precipitation. The water and impurities in the waste hydraulic oil settle to the bottom and are separated, and the waste hydraulic oil passes through the upper end of the sedimentation tank. The oil outlet enters the secondary sedimentation tank;

(3) (3) Gravity Settling: Pump the settled waste hydraulic oil into the separation tank with a delivery pump for gravity settling to remove water and impurities, and use gravity and heating to remove water and impurities, and the waste in the separation tank The hydraulic oil is heated to 50-60°C to separate the hydraulic oil and water, and the upper layer of pure hydraulic oil is sent to the next process, and the mixture of hydraulic oil and water in the lower layer is returned to the filter tank for recovery and filtration;

(4) Secondary water removal: Start the vacuum pump of the separator, and when the vacuum degree in the separator reaches -0.04MPa or above, pump the hydraulic oil that has undergone gravity settlement into the separator with a transfer pump, and use high-temperature distillation to remove it. Water, the distillation temperature is 100-120°C, and the distillation time is 30-40 minutes;

(5) Refining: Start the vacuum pump of the reactor, and when the vacuum degree in the reactor reaches -0.06MPa or above, send the hydraulic oil that has undergone secondary dehydration into the reactor with a gear pump, and add 15% of the weight of the hydraulic oil into the reactor. preparation, the reaction temperature is 80-90°C, and the reaction time is 10-30 minutes;

(6) Purification: The refined hydraulic oil is sent to the purifier, and the refining agent slag in the hydraulic oil is separated to obtain qualified hydraulic oil.

The refining preparation includes the following raw materials in parts by weight: 2-4 parts of flocculant, 4-8 parts of perlite, and 6-10 parts of modified bentonite. The preparation method of the modified bentonite is to place the bentonite in a reaction kettle, add a certain amount of modifier sulfuric acid solution, activate it at 80°C for 4 hours under constant temperature stirring, put it to room temperature for suction filtration, wash with water, and reach the pH of the bentonite. The value is greater than 4; then dried, crushed, and passed through a 200-mesh sieve to obtain modified bentonite. The flocculant includes Tween 80 and ethanol; the weight ratio of Tween 80 and ethanol is 1-2:8-9.

Claims (10)

1. a purifying method for extrusion machine waste hydraulic oil, is characterized in that: adopt full automatic purifying method, and comprise removal of impurities, precipitation, gravity settling, secondary dewater, refining and purification, step is as follows:

(1) removal of impurities: waste hydraulic oil is poured in filter vat, by the large granular impurity in the screen cloth removing waste hydraulic oil of filter vat, waste liquid is pressed in filter vat again by the filter element filtering of filter vat upper end after preliminary sedimentation, fine particle impurity in removing waste hydraulic oil;

(2) precipitate: the waste hydraulic oil after filtration is entered in settling bath by the filter core of filter vat upper end and staticly settles, separate after moisture in waste hydraulic oil and contamination precipitation to bottom, waste hydraulic oil enters two-stage precipitation groove by the oil outlet of settling bath upper end again;

(3) gravity settling: to dewater carrying out gravity settling in the waste hydraulic oil transferpump suction separating tank precipitated removal of impurities, the mode of gravity and heating is adopted to carry out dewatering removal of impurities, waste hydraulic oil in separating tank is heated to 50-60 DEG C, make hydraulic efficiency oil and water stratification, hydraulic efficiency oil pure for upper strata is sent into subsequent processing, and the hydraulic efficiency oil of lower floor and the mixture of water return in filter vat to reclaim and filter;

(4) secondary dewaters: the vacuum pump starting separator, when vacuum tightness in separator reaches more than-0.04MPa, by the hydraulic efficiency oil through gravity settling with in transferpump suction separator, pyrogenous mode is adopted to dewater, distillation temperature is 100-120 DEG C, and distillation time is 30-40 minute;

(5) refining: the vacuum pump starting reactor, when vacuum tightness in reactor reaches more than-0.06MPa, the hydraulic efficiency oil toothed gear pump dewatered is sent in reactor, add the finishing agent of hydraulic efficiency oil weight 15% through secondary, temperature of reaction is 80-90 DEG C, and the reaction times is 10-30 minute;

(6) purify: the hydraulic efficiency oil after refining is sent in cleaner, is separated by refining agent slag in hydraulic efficiency oil, obtains qualified hydraulic efficiency oil.

2. the purifying method of extrusion machine waste hydraulic oil according to claim 1, is characterized in that: described finishing agent comprises the raw material of following weight part: flocculation agent 2-4 part, perlite 4-8 part, modified alta-mud 6-10 part.

3. the purifying method of extrusion machine waste hydraulic oil according to claim 1, it is characterized in that: the making method of described modified alta-mud is for be placed in reactor by wilkinite, add a certain amount of properties-correcting agent sulphuric acid soln, activation 4 hours under 80 DEG C of constant temperature stir, put to room temperature suction filtration, washing, be greater than 4 to bentonitic pH value; Then dry, pulverizing, excessively 200 mesh sieves, obtain modified alta-mud.

4. the purifying method of extrusion machine waste hydraulic oil according to claim 1, is characterized in that: described flocculation agent comprises tween 80 and ethanol; The weight ratio of tween 80 and ethanol is 1-2:8-9.

5. the equipment of the purifying method employing of extrusion machine waste hydraulic oil as claimed in claim 1, it is characterized in that: comprise filter vat (1), settling bath (4), separating tank (5), separator (6), reactor (8) and cleaner (9), described filter vat (1) is connected with settling bath (4), settling bath (4), separating tank (5), separator (6), reactor (8) and cleaner (9) are connected by pipeline (10) successively, screen cloth (2) and filter core (3) is provided with in described filter vat (1), described separating tank (5) comprises electrically operated valve (11), sump oil bucket (12), blow-off pipe (13) and contaminated-oil basin (14), sump oil bucket (12) is connected by blow-off pipe (13) with oil sump (14), electrically operated valve (11) is located on blow-off pipe (13).

6. the treating plant of extrusion machine waste hydraulic oil according to claim 5, is characterized in that: described settling bath (4) is provided with transferpump (15) with separating tank (5) and separating tank (5) with the pipeline (10) of separator (6).

7. the treating plant of extrusion machine waste hydraulic oil according to claim 5, is characterized in that: described separating tank (5), separator (6) and reactor (8) are equipped with well heater.

8. the treating plant of extrusion machine waste hydraulic oil according to claim 5, is characterized in that: the top of described separator (6) is provided with steam drain (7).

9. the treating plant of extrusion machine waste hydraulic oil according to claim 5, is characterized in that: described separator (6) and reactor (8) are equipped with vacuum pump.

10. the treating plant of extrusion machine waste hydraulic oil according to claim 5, is characterized in that: described reactor (8) is provided with toothed gear pump and turbo-pump.