CZ193299A3 - System for treating pulpy mixture and process for treating such pulpy mixture - Google Patents

Abstract

A method and apparatus for treating a slurry that has been used for cutting workpieces, and which contains dispersion liquid and abrasive grains, where in the first decanting sludge the container (46), the slurry is used for centrifugation separating the mixture of impurities and the dispersion liquid from the slurry blends and to recover recyclable abrasive grains, in the second decanting purge vessel (47) is blasted a mixture for the purpose of separating impurities from the mixture and for purpose regenerating the recyclable dispersion liquid. Temperature used the slurry before it is introduced into the first decanter the sludge containers (46) or the amount of slurry used; supplied to the first decanting purge vessel (46) are adjusted in accordance with the observed properties, in particular with a specific gravity or viscosity of the mixture or dispersion liquid

Description

Technical field

The present invention relates to a slurry processing system and a method for processing the slurry used for cutting workpieces in cutting machines such as wire saws, wire saws and the like.

More particularly, the present invention relates to a slurry treatment system and a method for treating the slurry, wherein the impurities are optimally separated from the slurry used.

BACKGROUND OF THE INVENTION

Rope, wire or chain saws are usually used to slice workpieces, such as quartz blocks or the like. The wire saw includes a larger number of rollers and a single strand of wire that is

- spirally wound around these rollers with a predetermined pitch between each winding. The wire is guided by rotating the respective rollers. During the rotation of these rollers, a slurry containing abrasive grains is fed to the wire. In this arrangement, the workpiece is pressed against the moving wire to cut the workpiece simultaneously into a plurality of slices.

Slurry means an aqueous or oily liquid (dispersion liquid) in which abrasive grains are dispersed. The rope saw is equipped with a system for processing the slurry, the task of which is to prepare and process the slurry. Such a processing system comprises a pre-treatment tank in which the abrasive grains and dispersion liquid are mixed together to form a slurry. The slurry prepared in the preparation tank is fed to a wire saw.

It is preferred that the slurry used, which has already been used in a wire saw to cut workpieces, be recycled to reduce the overall cost of cutting the workpieces. However, the slurry used contains various impurities, in particular fine-grained components which are smaller than the abrasive grains. More precisely, the slurry used comprises impurities such as chips and debris formed during cutting of the workpiece as well as shattered abrasive grains. Such impurities reduce the cutting ability of a wire or wire saw.

The slurry treatment system comprises a separator that separates said impurities from the slurry used and recovers or regenerates recyclable abrasive grains and dispersion liquid. The regenerated abrasive grains and dispersion liquid are returned to the pre-treatment tank, where they are mixed with additionally supplied fresh abrasive grains and dispersion liquid to reconstitute the new slurry. This slurry is then fed from the pre-treatment tank to the wire saw and is recycled.

• · • ·

Fluctuations in the temperature of the slurry used or fluctuations in the amount of impurities contained in the slurry used alter the properties of the slurry, such as its specific gravity or viscosity. As a result of changes in the properties of the slurry used, the separation or separation efficiency of the separating device also changes. This may prevent the regeneration of the abrasive grains and dispersion liquid from the spent slurry or the removal of impurities in the regenerated abrasive grains and dispersion liquid.

SUMMARY OF THE INVENTION

Accordingly, it is therefore an object of the present invention to provide a slurry treatment system and method for treating the slurry, where the impurities are optimally separated from the slurry used, and where recyclable abrasive grains and dispersion liquid are recovered.

In order to achieve the above objects, a processing system for processing the slurry used for cutting workpieces has been developed in accordance with the present invention. The slurry comprises a dispersion liquid and abrasive grains. The processing system comprises separation means for performing a separation process on the slurry after use, to recover at least recyclable abrasive grains from the used slurry.

The product of this separation process is a separation liquid. The detection means detects the properties of the separation liquid. The adjusting means adjusts the temperature of the slurry used before it is fed to the separating means

means in accordance with the properties detected by the detection means.

In accordance with another aspect of the present invention, there is provided a processing system for processing a slurry used for cutting workpieces. The slurry comprises a dispersion liquid and abrasive grains. The processing system comprises separation means for performing a separation process on the slurry after use, to recover at least recyclable abrasive grains from the used slurry.

The product of this separation process is a separation liquid. The detection means detects the properties of the separation liquid. The adjusting means adjusts the amount of slurry used to be supplied to the separating means in accordance with the properties detected by the detecting means.

In accordance with yet another aspect of the present invention, there is provided a process for processing a slurry used for cutting workpieces. The slurry comprises dispersion liquid and abrasive grains. The processing method comprises performing a separation process on the slurry after use, to recover at least recyclable abrasive grains from the used slurry.

The product of the separation process is a separation liquid. The processing method further comprises detecting the properties of the separating liquid and adjusting the temperature of the slurry used before starting the separation process in accordance with the determined properties.

• · · · · · · · · · · · · · · · · · · ·

According to a further aspect of the present invention, there is provided a process for processing a slurry used for cutting workpieces. The slurry comprises dispersion liquid and abrasive grains. The processing method comprises performing a separation process on the slurry by means of the release means after its use, in order to recover at least recyclable abrasive grains from the used slurry.

The product of the separation process is a separation liquid. The processing method further comprises determining the properties of the separating liquid and adjusting the amount of slurry used to be supplied to the separating means in accordance with the determined properties.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention and its respective advantages will be explained in more detail below on the basis of a description of exemplary preferred embodiments thereof, which will be given with reference to the accompanying drawings, in which:

Fig. 1 is a schematic view showing part of a slurry processing system according to a first embodiment of the present invention;

Fig. 2 is a schematic view showing part of a slurry processing system according to a first embodiment of the present invention;

• · • · · · · ·

• ·

Fig. 3 is a schematic view showing part of a slurry processing system according to a first embodiment of the present invention;

FIG. 4 is a block diagram illustrating the electrical structure of the slurry processing system of FIGS. 1 to 3;

Fig. 5 is a flowchart showing adjusting the temperature of the slurry in a first embodiment of the present invention;

FIG. 6 is a flow chart illustrating adjusting the slurry temperature in a second embodiment of the present invention;

Fig. 7 is a flowchart showing adjusting the amount of feed slurry in a third embodiment of the present invention;

FIG. 8 is a flowchart showing adjusting the amount of feed slurry in a fourth embodiment of the present invention;

FIG. 9 is a schematic view showing part of a slurry processing system according to a fifth embodiment of the present invention; and FIG. 10 is a block diagram illustrating the electrical structure of the slurry processing system of FIG. 9.

• ·

DETAILED DESCRIPTION OF THE INVENTION

1 to 5, a first embodiment of the present invention will now be described. The overall structure of the slurry processing system is shown in Figures 1 to 3.

As shown in FIG. 1, the present slurry processing system comprises a plurality of wire or wire saws 11, with only two being shown in the figures. Each wire or wire saw 11 is provided with a slurry storage tank 12 in which a rotary stirrer 13 is arranged. A level sensor 14 is attached to the outside of the slurry storage tank 12 to monitor the level of the liquid in the storage tank 12. slurry.

A predetermined amount of the slurry containing, for example, an oily dispersion liquid and abrasive grains is contained in the slurry storage tank 12. This slurry is fed from the supply tank 12 to the respective associated wire or wire saw 11 via a pump 15.

Although not shown in the figures, each wire or wire saw 11 is provided with a plurality of rollers and a single strand of wire that is spirally wound around the rollers with a predetermined interval between each winding. When these rollers rotate and wind the respective wire, the slurry is fed to the wire from the slurry storage tank 12. In this state, the workpiece is pressed against the wire to simultaneously cut the workpiece into slices. During cutting, • · φφφφ φ ·

The slurry is renewed or regenerated in the slurry storage tank 12 so that it can be fed back to the work wire. In this way, the slurry is used repeatedly.

The slurry that is supplied to the wire or wire saws 11 is contained in the feed tank 16, which is arranged near the wire or wire saw 11. From the feed tank 16, the slurry is fed to the two slurry storage tanks 12 via the feed line. 20. A rotary stirrer 17 is provided in the feed tank 16. Level sensors 18 and 19 are attached to the outside of the feed tank 16 to monitor the level of the slurry in the feed tank 16.

A valve 21 and a pump 22 are arranged at the upstream end of the feed line 20 in the upstream direction. The slurry in feed tank 16 is supplied to each slurry tank 12 through feed line 20 through valve 23. This feed line 20 is connected to the recovery line. 20a, by which the slurry is returned to the feed tank 16 via the feed line 20.

A regeneration tank 24 is provided near the feed tank 16. A rotary stirrer 25 is mounted in the recovery tank 24. On the outside of the recovery tank 24, two level sensors 26 and 27 are mounted to monitor the level of the slurry in the recovery tank 24.

The recovery tank 24 is connected to the recovery pipe 28 through which the slurry is recovered from the slurry storage tank 12 and to the conveyor line 99 through which the recovered or recovered slurry is fed to the separation and recovery mechanism 40. , which will be described in more detail below. A valve 30 and a pump 31 are provided at the upstream end of the conveying line 29 upstream.

Reuse of the slurry in the slurry storage tank 12 increases the amount of impurities (e.g., chips and workpiece fragments and shredded abrasive grains) in the slurry and affects the cutting performance of the wire or wire saw 11. Therefore, all or at least a portion of the slurry from each slurry storage tank 12 to a recovery tank 24 via a pump 15, a valve 32, and a recovery line 32, either periodically or at the end of each cutting cycle. From the feed tank 16, each slurry storage tank 12 is replenished in accordance with the amount of slurry used from the slurry storage tank 12.

The circulation pipe 28a is arranged between the regeneration pipe 28 and the valve 35 which is arranged in the conveying pipe 29. Consequently, the slurry mixes through the regeneration tank 24, the conveying pipe 29, the circulation pipe 28a and the regeneration pipe 28.

The conveying line 29 is connected to the metering tank 34 shown in FIG. 2. The slurry used from the regeneration tank 24 is discharged to the metering tank 34 via a valve 30, a pump 31 and a valve 35 located in the transport line 29 A pair of level sensors 36 and 37 are attached to the outside of the metering tank 34 to sense the level of the water level.

9900 9 99 9

99 99 999 999

9 9 9 9 9 • 9 99 99 ·· • 999999 «slurry in the metering tank 34. These level sensors 36 and 37 are used during the slurry separation process, which will be described later, to measure the amount of slurry used, processed and treated during each separation process.

This transfer valves 41, 42, a slurry

If used, it is converted to

The metering tank 34 is connected to the separator and regeneration mechanism 40 shown in FIG. 3 via a transfer line 39.

the piping 39 is provided with a plurality of 43 and 44 and a pump 45.

from the metering tank 34 of the separator and regeneration mechanism 40 via the transfer line 39, impurities are removed from the slurry used in the separator and regeneration mechanism 40, whereby recyclable abrasive grains and dispersion liquid are recovered and recovered. Said impurities also comprise fine granular particles having a smaller size than the abrasive grains, such as cutting chips and workpiece fragments and shattered abrasive grains.

Centrifugal conveyors

The separation and recovery mechanism 40 is provided with a first decantation sludge vessel 46 or first separation means, and a second decantation sludge vessel or second separation means. For example, screw type separators may be used in the form of the first and second decanting sedimentation tanks.

98 9 «** • 9 8 · 9 · ·

9 9 9 999 • 9 9 9 9 9 • • · · · »

9999 9999 9

9 «9

9 9 ·

9 9 ·

999 * 99 • 9 · 9

In the first decantation vessel 46, the spent slurry fed through the transfer line 39 is centrifuged, for example, into recyclable abrasive grains having a grain diameter of five microns or more and a turbid dispersion liquid (referred to herein as the primary separation liquid) containing fine particles that are smaller than recyclable abrasive grains.

Primary Separation Liquid Separated Decanting Drain Container Decanting Drain Container Decanting Drain Container First to Second In the second separation is discharged via line 46a, 47, the primary liquid is centrifuged for impurities and clean recyclable dispersion liquid to reuse this recyclable dispersion liquid (which here will be referred to as a secondary separation liquid).

The impurities separated in the second decantation sludge vessel 47 are discharged to the volume well 49 via the discharge outlet line 47a. The secondary separation liquid recovered in the second decantation vessel 47 is discharged to the first decantation vessel 46 via line 47b. Valves 48 and 70 are disposed within this conduit 47b.

The abrasive grains recovered in the first decantation vessel 46 are mixed with the secondary separation liquid supplied from the second decantation vessel 47 and discharged to the first transfer valve 50 via the first decantation vessel 46. In this way, the abrasive grains, which are solids , easily drained.

· • * · «« «• •«

A first detector 92 for detecting the properties of the primary separation liquid is provided in the conduit 46a. A second detector 93 for detecting the properties of the secondary separation fluid is provided in the conduit 47b. Both the first detector 92 and the second detector 93 are each provided with a gravity measuring device 78, a flow rate measuring device 79 and a viscosity measuring device 80.

As shown in FIG. 2, the second adjusting valve 51 is downwardly disposed from the first adjusting valve 50. The mixture of abrasive grains and secondary separation fluid that is discharged from the first decantation blower vessel 46 is selectively fed. to the second adjusting valve 51 and to the metering tank 34 by means of the first adjusting valve 50. The mixture of abrasive grains and the secondary separating liquid that is fed to the second adjusting valve 51 is selectively discharged into a pair of pre-treatment tanks 54.

Each preparation tank 54 is provided with a rotating stirrer 55. A weight sensor 56 is attached to the outside of the preparation tank 54. This weight sensor 56 detects the weight of the slurry in the preparation tank 54.

A hopper 58 containing fresh abrasive grains is arranged above each preparation tank 54. These fresh abrasive grains are fed from the hopper 58 to the associated composite preparation tank 54 via a vibratory feeder 59. Each hopper 58 is connected to an air supply line 60 that leads to an air compressor 61.

• 9

9 «9 · · 9

9,999,999 ·

9

9

9999 9999

When the abrasive grains are fed by the tank 54, the air compressor 61 feeds into the hoppers 58 to assist in the abrasive grains. The hopper 58 and the pre-treatment tanks 54 are connected to the dust collector 63 via the suction line 62. Abrasive grains (particularly fine shredded abrasive grains entering the hopper 58 and the pre-treatment tanks 54 are discharged via the dust collector 63.

A pair of dispersion liquid tanks 64, shown in Figure 3, are located near the preparation tanks 54. These dispersion liquid tanks 64 comprise fresh dispersion liquid. This fresh dispersion liquid contained in the dispersion liquid tanks 64 is fed to each preparation tank 54 shown in FIG. 2 via a valve 65, a pump 66 and a pair of valves 67.

The fresh abrasive grains from the hopper 58 and the fresh abrasive grains from the dispersion liquid tank 64 are mixed and mixed with the abrasive grains and dispersion liquid from the separation and regeneration mechanism 40 in each preparation tank 54. As a result, a slurry of abrasive grain and a dispersion liquid having a predetermined ratio, this slurry preparation being carried out alternately by the two preparation tanks 54.

The mixing ratio between the abrasive grains and the dispersion liquid in the preparation tanks 54 is from about 1: 0.7 to 1: 0.98 expressed in weight data. Grains made from a material such as silicon nitride or silicon carbide which:

9 9 9

99 99 99 into pre-compressed air

9 ··· 9999 9 9 9 9 9 9

9 9 9 ·· 99

9 9

999 «99

9 • 9 99 are, for example, # 600, # 800 or # 1000, used as abrasive grains. Silicone oil (manufactured, for example, by Paresu Kagaku Kabushiki Kaisha, product number PS-LW-1) is used as the dispersion liquid.

As shown in Figure 3, the valve 69 connects the bifurcated pipe 68 to the inlet duct which extends from the dispersion liquid tank 64 to the brewing tank 54 of Figure 2. The bifurcated pipe 68 is connected to the duct 47b via valve 70.

The secondary separation liquid recovered in the second decantation sludge vessel 47, or the recyclable dispersion liquid, is periodically supplied to the sump 49 via the discharge outlet pipe 47a from the valve 48. At the same time, the dispersion liquid from the dispersion liquid tank 64 is not only supplied to the preparation tank 54. but it is also fed to the first decantation sludge vessel 46 via a bifurcated pipe 68 from the valve 70.

As shown in FIG. 1 and FIG. 2, the pre-tanks 54 are connected to the feed tank 16 via a feed line 71. As shown in FIG. 2, portions of the feed line 71 that are connected to two The valves 73 and 74 and the pump 75 are also arranged on the supply line 71. The slurry prepared in each preparation tank 54 is discharged to the feed tank 16 via the supply line 71.

• • • • 4 »· 4» · <

·· ·· • · * ···

The circulation pipe 76 extends from the inlet pipe valve 71 towards the preparation tanks 54. The transfer line 39 comprises a common line 39a, which also acts as a circulation line 76, and which extends between the valves 43 and 44. The circulation pipe 76 is bifurcated via valve 77 so that it extends towards each of the two pre-treatment tanks 54. During and after the slurry preparation in the two pre-treatment tanks 54, the slurry flows from the pre-treatment tanks 54 through part of the supply line 71 and through the circulation line. 7 6 via pump 75.

A detector 100 is provided in the common conduit 39a to determine the properties of the slurry passing through the common conduit 39a. The detector 100 comprises a gravity measuring device 78, a flow rate measuring device 79 and a viscosity measuring device 80.

If the slurry used is fed to the separator and recovery mechanism 40 through the valve 43 and through the transfer line 39, or if the slurry from the pre-tanks 54 is circulated through part of the feed line 71 and through the circulation line 76, the gravity, flow rate and the viscosity or viscosity of the slurry is appropriately detected by the gravity measuring device 78, the flow rate measuring device 79 and the viscosity measuring device 80.

It is also possible to use a measuring device which includes both the specific gravity measuring device 78 and the flow rate measuring device 79. Thus, for example, it is possible

9 • 9 99 • • 9 99 ·

9 9 9 microscopic motion flow meter (manufactured by Kabushiki Kaisha Ohbaru, for example), which simultaneously senses both specific gravity and liquid flow rate. As a viscosity or viscosity measuring device 80, a pressure differential sensor 3051C (manufactured, for example, by Fisher-Rosemount Japan Kabushiki Kaisha) may be used.

A temperature regulator and detector 81 is provided downstream of the detector 100 in a common conduit 39a. The temperature regulator and detector 81 heats or cools the slurry, for example by varying the temperature or flow rate of the heat transfer medium to transfer heat to the slurry. When the slurry used is transferred to the separator and recovery mechanism 40 through the transfer line 39, the temperature controller and detector 81 determine the temperature of the slurry. The temperature of the slurry reflects the properties or viscosity or viscosity of the slurry.

The electrical equipment of the above slurry processing system will now be described.

As shown in FIG. 4, the operation of the entire slurry processing system and the handling of the slurry is controlled and controlled by the central processing unit (CPU) 84. The various types of control programs necessary for the operation of the slurry processing system are stored only in the read memory (ROM) 85. The data and data obtained during the execution of the control programs are temporarily stored in random access memory 86 (RAM).

11 ·· · * 19 19

·· 19

9 1 1

9 9 1

111 911

9

9 9

The central processing unit (CPU) 84, only the read memory (ROM) 85 and random access memory (RAM) 86 form control means.

The central processing unit 84 receives detection signals from the first detector 92, the second detector 93, the specific gravity measuring device 78 and the viscosity measuring device 80, as well as the operational operating signals from the operational operating panel 87.

The central processing unit 84 also sends control signals for the temperature controller and the detector 81 for the valves, for the pumps, and for both decanter sludge tanks 46 and 47, via respective excitation circuits 88, 89, 90 and 91. Said valves and said The pumps include those devices shown in Fig. 1 to Fig. 3. However, Fig. 4 shows only those valve and pump reference numerals that are particularly related to the present invention.

When performing the separation process on the slurry used, the central processing unit 84 then adjusts the valves 41 to 44 to open the transfer line 39 which leads from the metering tank 34 to the separation and recovery mechanism 40. At this stage, the central processing unit 84 starts the pump 45 to transfer the used slurry from the metering tank 34 to the separator and recovery mechanism 40. When the used slurry is transferred, the central processing unit 84 performs the flowchart shown in FIG. 4. This process will be described in more detail below.

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During the separation process of the slurry used, the central processing unit 84 also displays the values obtained from the specific gravity measuring device 78, the flow rate measuring device 79 and the viscosity or viscosity measuring device 80 and the values obtained from the first detector. 92, and from the second detector 93, an indicator (not shown) that is arranged on the operating operation panel 87.

The central processing unit 84 adjusts the valves 4, 3, 44 and 72 to 74 during and after the preparation of the slurry in the preparation tanks 54 to open the flow path that extends through a portion of the supply line 71 and through the circulation line 76 from the preparation tanks 54 and At this stage, the central processing unit 84 actuates the pump 75 to circulate the slurry from the preparation tank 54 through part of the feed line 71 and through the circulation line 76.

During circulation of the slurry, the central processing unit 84 then determines the specific gravity, flow rate and viscosity of the slurry through the respective gravity measuring device 78, the respective flow rate measuring device 79, and the corresponding viscosity measuring device 80. or viscosity. The central processing unit 84 then adjusts the amount of abrasive grains fed to the pre-treatment tanks 54 from the hoppers 58, and the amount of dispersion liquid fed to the pre-treatment tanks 54 from the dispersion liquid tanks 64.

··

· · »« «· · · · · * · · · · ·

In this way, in the preparation of the slurry, the ratio of abrasive grains to dispersion liquid in the preparation tanks 54 is maintained at an optimum value, i.e., as described above, at about 1: 0.7 to 1: 0.98 by weight. data.

Operation of the slurry processing system in this embodiment of the present invention will now be described.

If cutting of the workpiece begins with each wire or wire saw 11, the slurry from the slurry storage tanks 12 is fed to the wires of the respective saws 11, the used slurry from the saw wires 11 being discharged into the slurry storage tanks 12. The slurry used is discharged from the storage tanks 12 to the recovery tank 24 periodically periodically or after each end of the respective cutting cycle. In addition, the slurry storage tanks 12 are supplemented with a slurry that is fed from the feed tank 16 in accordance with the regenerated amount of the slurry used.

The slurry used is withdrawn from the recovery tank 24 to the metering tank 34 via the conveying line 29 9. The slurry used is further discharged from the metering tank 34 to the separation and recovery mechanism 40 via transfer line 39. The recyclable abrasive grains and dispersion liquid are recovered from the slurry used by means of the first decantation sludge vessel 46 and the second decantation sludge vessel 47 in the separation and recovery mechanism 40.

• · · · · · · · · '· · · · · · ···· 70 .............. • · · ········ ® • · · · · · · · · · • • · Regenerovaná abrasive grains and dispersion liquid j sou returned to preparatory tank 54 in mixed condition. In the preparation tanks they are regenerated abrasive grains and

the dispersion liquid is mixed with the fresh abrasive grains being fed from the hoppers 58 and with the fresh dispersion liquid being fed from the dispersion liquid tanks 64 to produce a slurry having a suitable pre-mix ratio.

During or after the slurry preparation, the slurry from the pre-treatment tanks 54 is circulated through the circulation line 7 6. If the slurry liquid level in the pre-tanks 54 drops to a predetermined level or lower, the prepared slurry from the pre-treatment tanks 54 is discharged supply tank 16 via supply line 71.

The adjustment of the slurry temperature that is performed during the slurry separation process will now be described in more detail below with reference to the flow diagram shown in Figure 5. This adjustment is made by the central processing unit 84 and is based on a control program. stored in read only memory 85.

If it is confirmed that the slurry separation process was started in step S1, then the central processing unit 84 proceeds to step S2. In this step S2, the central processing unit 84 then determines the properties (specific gravity or viscosity) of the primary separation liquid that is fed to the second decantation blower vessel 47 from the first decantation blower vessel 46, at: Based on the detection signals coming from the first detector 92.

Subsequently, in step S3, the central processing unit 84 checks whether or not the detected value indicating the properties of the primary separation liquid is within a predetermined range, the size of which is stored in the random access memory 86. For example, if the specific gravity of the primary separation liquid is determined, it is judged whether or not the specific gravity is within the range of 1.00 to 1.05. If the viscosity or viscosity of the primary separating liquid is determined, it is judged whether or not the detected viscosity or viscosity is within the range of 50 cp to 120 cp (centipoise).

If the detected value is not within a predetermined range, the central processing unit performs step S4 and controls the temperature controller and detector 81 to increase or decrease the temperature of the slurry used, which is fed to the first decantation sludge vessel 46, so that the measured value returns to a predetermined range. Thereafter, the central processing unit 84 returns to step S2 and performs steps S2 to S4 repeatedly until the value detected by the first detector 92 returns to a predetermined range.

For example, if the viscosity or viscosity of the primary separating liquid is determined and the viscosity is higher or predetermined, the temperature of the slurry used is increased to reduce the viscosity of the slurry used.

··· · ··· »

Conversely, if the detected viscosity is less than a predetermined value, the temperature of the slurry used is lowered to increase the viscosity of the slurry used.

The predetermined value is determined in accordance with the type of slurry used, the setting conditions of the decanter sludges 46 and 47, as well as other parameters so that the decanter sludges 46 and 47 perform satisfactory separation.

If the detected value lies within a predetermined range in step S3, then the central processing unit proceeds to step S5 and verifies whether or not the slurry separation process has been completed. Steps S2 to S5 are performed repeatedly by the central processing unit 84 until the slurry separation process is complete.

As described above, in this embodiment, the first detector 92 detects the properties (specific gravity or viscosity or viscosity) of the primary separation liquid recovered in the first decantation blowdown vessel 46. In addition, the temperature of the slurry used to adjust the viscosity is adjusted. or the viscosity of the slurry used so that its value is maintained within a predetermined range.

In this way, the separation efficiency of the first decantation blowdown vessel 46 and the second decantation blowdown vessel 47 is kept at a constant level in the separation and recovery mechanism 40. This makes the abrasive grains recyclable and

The dispersion liquid is effectively recovered and recovered from the spent slurry.

The structure and structure is quite simple, since only the temperature of the slurry used, which is discharged to the separator and regeneration mechanism 40, must be temperature controlled and centralized by the detector 81 of the unit 84, the detector 81.

which controls said temperature controller; and

Regeneration of the abrasive grains is carried out in the first decantation blower vessel, while the dispersion liquid regeneration is carried out in the second decantation blower vessel 47. Consequently, the rotational speeds of these decantation blower vessels 46 and 47 can be adjusted independently of the values that are suitable for regenerating the abrasive grain or dispersion liquid.

The additional tank 54 may be only one. In such a case, the feed tank 16 may be omitted, as the slurry prepared in a single preparation tank 54 may be directly fed to the slurry storage tank 12 for the wire or wire saws 11.

The regeneration tank 24 may be omitted, and the used slurry may be fed directly to the metering tank 34 from the slurry storage tanks 12 for the wire or wire saws 11.

An aqueous dispersion liquid may be used in place of the oily dispersion liquid. In this case, the appropriate range for the properties of the slurry (for its specific gravity or viscosity or viscosity) must, of course, be changed.

The second decantation vessel can be omitted, and the entire system can be converted to a system that only renews and regenerates abrasive grains.

In the second embodiment of the invention shown in FIG. 6, step S2 in the flow chart of FIG. 5 is replaced by step S2 '. In this step S2 /, the central processing unit 84 then determines the properties (specific gravity and viscosity) of the secondary separation liquid that is regenerated in the second decantation blowdown vessel 47, based on the detection signals coming from the second detector 93.

For example, if the specific gravity of the secondary separating liquid is detected, then in the next step S3, it is judged whether or not the specific gravity of the secondary separating liquid is within the range of 0.92 to 0.99. If the viscosity or viscosity of the secondary separating liquid is determined, it is judged in step S3 whether or not this viscosity value lies within or between 30 cp and 70 cp. The advantages of this embodiment are the same as that of the embodiment shown in FIG. 5.

In the third embodiment of the present invention shown in FIG. 7, step S4 in the flow chart of FIG. 5 is replaced by step S4 ^of . In this step S4 ^z , the central processing unit 84 controls the pump 45 to increase or decrease the amount of slurry used in the first decantation sludge tank 46, such that the measured value indicating the properties of the primary separation liquid lies within a predetermined range. An AC drive pump may be used as the pump 45.

This design and structure is very simple, since only the amount of slurry used that is fed to the separation and recovery mechanism 40 is to be adjusted by the pump 45 and by the central processing unit 84 which controls the operation of the pump 45.

The viscosity or viscosity of the slurry correlates with the amount of solids (abrasive grains and impurities) contained in the slurry. As a result, by adjusting the amount of slurry used to feed the first decantation vessel 46 to match the viscosity or viscosity of the primary separation liquid, the amount of solids fed to the first decantation vessel 46 is constant. Therefore, the load applied to both the decanter sludge vessels 46 and 47 is substantially constant, so that the decanter sludge vessels 46 and 47 perform a constant satisfactory separation.

In the fourth embodiment of the present invention shown in FIG. 7, step S2 in the flow chart of FIG. 5 is replaced by step S2 '. This step S2 'is identical to step S2 ^Z of Figure 6. The advantages of this embodiment are the same as those of the embodiment shown in Figure 7.

• · · ♦ * 9 9 · · · · · ··········· 9 9 9 9 99 9 »999 999 t- 'J 9 9 9 9 9 9 · · ···· · ··

In the fifth embodiment of the present invention shown in Figure 9, a portion of the slurry processing system of the embodiment shown in Figures 1 to 3 is changed. These altered parts are shown only schematically. In Figure 9, the same reference numerals are used for those elements and components that are the same as the corresponding elements and components of the slurry processing system shown in Figures 1 to 3.

As shown in FIG. 9, the common conduit 39a, which serves as the transfer conduit 39 and the circulation conduit 76, extends between the valve 43 and the second valve 102 (corresponding to the valve 44 of FIG. 2). The circulation pipe 76 extends from the second valve 102 towards the preparation tank 54 (see FIG. 2). The first valve 101 is disposed in a common conduit 39a, upstream of the detector 100, which includes a gravity measuring device 78, a flow rate measuring device 79, and a viscosity measuring device 80.

A third valve 103 is disposed in a conduit 46a that extends from the first decantation sludge vessel 46 towards the second decantation sludge vessel 47. A fourth valve 104 is disposed in the dispersion liquid discharge conduit (corresponding to the discharge conduit 47a of FIG. 3) extending from the second decantation sludge vessel.

The bypass line 105, which bypasses the first valve 101, the detector 100 and the second valve 102, extends between the common line 39a downstream of the temperature regulator and detector 81 and the separator and detector 81a. In this bypass line 105, a fifth valve 106 is provided.

The first inlet conduit 107 extends upstream of the third valve 103 and the common conduit 39 upstream of the detector 100. A sixth valve 108 is disposed in the first inlet conduit 107. The first outlet conduit 109 extends between the common conduit 39a. downstream of the detector 100 and downstream of line 46a from third valve 103. A seventh valve 110 is disposed within this first outlet line 109.

The second inlet conduit 111 extends between the dispersion liquid discharge conduit of the second decanting clarifier vessel 47 and the common conduit 39a upstream of the detector 100. In this second inlet conduit 111 an eighth valve 112 is provided. The second outlet conduit 113 extends between the common conduit 39a downstream of the detector 100 and the underside of the fourth valve 104. A ninth valve 114 is disposed within the second outlet conduit 113.

The first valve 101, the second valve 102, the third valve 103, the fourth valve 104, the fifth valve 106, the sixth valve 108, the seventh valve 110, the eighth valve 112 and the ninth valve 114 are optionally opened and closed to switch the flow line. In accordance with the selected flow line, the detector 100 then detects the properties (specific gravity, flow rate and viscosity or viscosity) of the slurry used, the primary separation liquid, which is centrifuged in the first decantation sludge vessel 46, and

V * ·· φ φ φ φ φ φ φ φ φ · φ φ φ φ φ φ φ «« · φ separ, «« «« «« «« «« «« «« «« «« «« «« In other words, the detector 100 functions as the first detector 92 and the second detector 93 of Figure 3.

The electrical interconnection of the above slurry processing system will now be described with reference to Figure 10. The same reference numerals denote those elements and components that are identical to the corresponding corresponding elements and components of the handling system shown in Figure 4. .

As shown in FIG. 10, the central processing unit (CPU) 84 receives detection signals from the specific gravity measuring device 78, the flow rate measuring device 79, and the viscosity or viscosity measuring device 80, as well as receiving operational signals from the operational operating mode. panel 87. This central processing unit (CPU) 84 also sends command signals to the switching solenoids 116, each arranged for one of the valves, for the first valve 101, for the second valve 102, for the third valve 103, for the fourth valve 104, a fifth valve 106, a sixth valve 108, a seventh valve 110, a eighth valve 112, and a ninth valve 114 via an excitation circuit 115.

If the slurry used is sent to the separator and regeneration mechanism 8, or if the slurry used in the pre-treatment tank 54 (see FIG. 2) is circulated through the circulation pipe 76, then the CPU 84 determines the gravity, flow rate and viscosity. or the viscosity of the slurry used before it

9

999

9 9 9 9 9 9

9999 9999 9 9 9 9 · · · 9 by detector 10. The central processing unit (CPU) 84 then stores the detected results in random access memory (RAM).

The central processing unit (CPU) 84 also reconnects the flow line with the first to ninth valves to determine the specific gravity, flow rate and viscosity or viscosity of the primary separation liquid that is centrifuged in the first decantation sludge tank 46 using a 10Q detector. . The central processing unit (CPU) 84 then stores the detected results in random access memory (RAM) 86.

In addition, the central processing unit (CPU) 84 reconnects the flow line using the first through ninth valve to determine the specific gravity, flow rate and viscosity or viscosity of the secondary separation liquid that is centrifuged in the second decantation blowdown vessel 47 using a detector 100 The central processing unit (CPU) 84 then stores the detected results in random access memory (RAM) 86.

The central processing unit 84 displays these readings on an indicator arranged on the operating operating panel 87. The central processing unit 84 further utilizes these readings to adjust the temperature or feed rate of the slurry used, using one of the of the following flow diagrams shown in Fig. 5, Fig. 6, Fig. 7 and Fig. 8.

9 9 9

9

9

9 • 9 9 »99 ·· · * 9 9 • 9 999

9 9 9 9 · 9 · <9 and ·

9 9 ·

9 9 9

9 9 9 • 999,999

9

The operation and relevant for processing the slurry according to the present invention will now be described.

operation of the system of this embodiment

Normally, during the slurry separation process, the third valve 103, the fourth valve 104 and the fifth valve 106 are opened, while the remaining first valve 101, second valve 102, sixth valve 108, seventh valve 110, eighth valve 112, and ninth valve 114 are closed. In this state, the slurry used by each wire or wire saw 11 is fed to the separation and regeneration mechanism 40 from the recovery tank 24 (see FIG. 1) through the bypass line 105 without passing through the detector 100 as shown in FIG. 9. represented by the arrow A1, drawn by a solid line.

The recyclable abrasive grains and the secondary separation liquid or the purified dispersion liquid are recovered from the slurry used in the first decantation tank 46 and the second decantation tank 47 and then returned to the preparation tank 54 (see FIG. 2).

During the slurry separation process, the central processing unit (CPU) 84 then switches the first valve 101, the second valve 102, the third valve 103, the fourth valve 104, the fifth valve 106, the sixth valve 108, the seventh valve 110, the eighth valve 112 and the ninth valve 114 after each predetermined period of time to subsequently determine the properties (specific gravity, flow rate and viscosity / viscosity) of the slurry used, the primary separation liquid and the secondary separation liquid.

• 9 9 99 * 9

9 9 9 9 9 9 9 9 9

9 9 9 9 9 9 9 9

9,999 9,999,999,999

9 9 9 9 9 9

999 · 9999 99 99 99 ··

To determine the properties of the slurry used, only the first valve 101, the second valve 102, the third valve 103, and the fourth valve 104 are opened. The remaining valves, i.e., the fifth valve 106, the sixth valve 108, the seventh valve 110, the eighth valve 112 and the ninth valve 114, are closed.

Thereby, the spent slurry mixture is passed through the detector 100, through the first decanting sludge vessel 46 and through the second decanting sludge vessel 47, as shown in FIG. 9, by the arrows A2 drawn by dashed lines.

Accordingly, the specific gravity measuring device 78, the flow velocity measuring device 79 and the viscosity / viscosity measuring device 80 send detected signals relating to the specific gravity, flow rate and viscosity or viscosity of the slurry used to the central processing unit (CPU) 84. .

Only the fourth valve 104, the fifth valve 106, the sixth valve 108 and the seventh valve 110 are open to determine the primary separation fluid properties. The other valves, i.e. the first valve 101, the second valve 102, the third valve 103, the eighth valve 112 and the ninth valve 114, are closed.

Thereby, the spent slurry is passed through the bypass line 105, through the first decanting sludge vessel 46, through the first inlet conduit 107, through the detector 100, through the first outflow conduit 109 and through the second decanting sludge vessel 47, as shown by arrow A3 in FIG. , dashed line, one short dash at a time.

9 9 9 9 9 9 99 99 9 9 999

9 9 9 9 9

9

9999 9900 99 9 9

9

999 10 »9

9

9

9 9 9 ·

Accordingly, the specific gravity measuring device 78, the flow rate measuring device 79, and the viscosity / viscosity measuring device 80 send the detected signals relating to the specific gravity, flow rate and viscosity or viscosity of the primary separation liquid that is separated in the first decantation blowdown. container 46, into a central processing unit (CPU) 84.

Only the third valve 103, the fifth valve 106, the eighth valve 112, and the ninth valve 114 are open to determine the properties of the secondary separation liquid or recyclable dispersion liquid. The remaining valves, i.e. the first valve 101, the second valve 102, the fourth valve 104, the sixth valve 108 and the seventh valve 110 are closed.

Thereby, the spent slurry used is passed through the bypass line 105, through the first decantation sludge vessel 46, through the second decantation sludge vessel 47, through the second inlet port.

pipe 111, via detector 100 and over second output pipe 113, as shown FIG. 9 arrows A4, plotted dashed line always be two short commas. Accordingly, the measuring equipment 78 specific gravity,

the flow rate measuring device 79 and the viscosity / viscosity measuring device 80 send the detected signals relating to the specific gravity, flow rate and viscosity or viscosity of the recyclable dispersion liquid that is separated in the second decantation blowdown vessel 47 to the central processing unit (CPU) 84 .

»» • 10 99

9 9 • 9

9 9

9

9 9

9 9 «9 999

9 9 9

9 9 ·

9 9 ♦ 9

9 9 9

9 9 ·

999 999

9

As described above, in this embodiment of the present invention, the properties of the slurry used, the primary separation fluid and the secondary separation fluid are determined successively with the aid of a single system of specific gravity measuring device 7, flow rate measuring device 79 and measuring device 80. viscosity or viscosity by switching the flow of the slurry with the aid of a plurality of valves. This minimizes the number of detectors for detecting the properties of the slurry, as well as greatly simplifies the detection structure.

While a number of possible embodiments of the present invention have been described herein, it will be apparent to those skilled in the art that the present invention may be embodied in a variety of other specific forms without departing from the spirit or scope of the invention.

Therefore, the examples and various embodiments of the present invention are to be considered as illustrative only and not restrictive, as the present invention cannot be limited to the details and details herein, but may be modified in various ways using appropriate equivalents within the scope of protection defined by by the following claims.

Claims (11)

PATENT CLAIMS A process for processing a slurry used for cutting workpieces, wherein the slurry comprises dispersion liquid and abrasive grains, the processing system comprising separating means (40) for performing a slurry separation process after use of the slurry to recover at least recyclable abrasives grains from the slurry used, the separation product being the process is characterized the system includes: separační that liquid, processing - detection means (92, 93, 100) separation fluid properties; and for detection - adjusting means used slurries before (81) for temperature setting its supply to separating means (40) in accordance with the properties detected by the detection means (92, 93, 100). Processing system according to claim 1, characterized in that the detection means (92, 93, 100) detect at least one of the density and viscosity values of the separation liquid. The processing system of claim 1, wherein the separation means (40) applies centrifugal force to the slurry to separate the components of the slurry. ·· • fl fll »flfl ·· ·· 9 · 9 · flflfl flflfl · fl · flflfl · flflfl · fl flflfl flfl flfl flflfl flfl * • fl flflflfl fl fl • flflfl flflfl · fl * flfl flfl ·· The processing system of any one of claims 1 to 3, wherein after use of the slurry, the slurry further comprises impurities that are finer than the abrasive grains, wherein the separation means (40) comprise: - first separation means (46) for centrifugally separating the mixture of impurities and dispersion liquid from the spent slurry to recover recyclable abrasive grains from the slurry, wherein the mixture is a separation liquid, and - second separation means (47) for centrifugal separation of impurities from the mixture for regeneration recyclable dispersion liquid from the mixture. 5. Processing system according to any of previous claims 1 to 3 characterized are you m that after use porridge blending the slurry further comprising impurities that are finer than the abrasive grains, the release agents (40) comprising: - first separation means (46) for centrifugally separating the mixture of impurities and dispersion liquid from the spent slurry to recover recyclable abrasive grains from the slurry, and - second separation means (47) for centrifugal separation of impurities from the mixture to recover recyclable dispersion liquid from the mixture, wherein the recovered dispersion liquid is a separation liquid. 44 44 44 4 4444 444 4444 4 4 4 44 4 4 4 44 44 4 4 4 445 4 4 4444 4444 44 » A process for processing a slurry used for cutting workpieces, wherein the slurry comprises dispersion fluid and abrasive grains, the processing system comprising separating means (40) for performing a slurry separation process after use of the slurry to recover at least recyclable abrasives. grains from the slurry used, the separation product being the process is separační liquid, characterized the system includes: that processing - detection means (93, 100) for detection separation liquid properties, , and - adjusting means (45) for adjusting the amount used slurries, supplied into separation means (40) in accordance with the properties detected by the detection means (92, 93, 100). Processing system according to claim 6, characterized in that the detection means (92, 93, 100) detect at least one of the specific gravity and viscosity values of the separation liquid. The processing system of claim 6, wherein the separation means (40) applies centrifugal force to the slurry to separate the components of the slurry. A processing system according to any one of claims 6 to 8, characterized in that after use of the slurry, the slurry further comprises:. φ · φ φ φ Φ impurities that are finer than abrasive grains, the release agents (40) comprising: - first separation means (46) for centrifugally separating the mixture of impurities and dispersion liquid from the spent slurry to recover recyclable abrasive grains from the slurry, wherein the mixture is a separation liquid, and - second separation means (47) for centrifugal separation of impurities from the mixture to recover recyclable dispersion liquid from the mixture. The processing system of any one of claims 6 to 8, wherein after use of the slurry the slurry further comprises impurities that are finer than the abrasive grains, wherein the separation means (40) comprise: - first separation means (46) for centrifugally separating the mixture of impurities and dispersion liquid from the spent slurry to recover recyclable abrasive grains from the slurry, and - second separation means (47) for centrifugal separation of impurities from the mixture to recover recyclable dispersion liquid from the mixture, wherein the recovered dispersion liquid is a separation liquid. 11. A process for processing a slurry used for cutting a workpiece, the slurry comprising a dispersion liquid and abrasive grains; 999 9 9 9 * 9 9 9 9 9 999-99, characterized in that the processing method comprises: - performing a separation process on the slurry after use to recover at least recyclable abrasive grains from the used slurry, the product of the separation process being a separation liquid, - detecting the properties of the separation liquid, and - adjusting the temperature of the slurry used prior to carrying out the separation process in accordance with the observed properties. A process for processing a slurry used for cutting a workpiece, the slurry comprising a dispersion liquid and abrasive grains, characterized in that the process comprises: - performing a separation process on the slurry by means of separation means (40) after using the slurry to recover at least recyclable abrasive grains from the slurry used, the product of the separation process being a separation liquid, - detecting the properties of the separation liquid, and - adjusting the amount of slurry used to be supplied to the separating means (40) in accordance with the determined properties.