JPH05412A - Cleaning of polishing mineral sludge for use in cutting stone such as granite and method and device for control of its composition - Google Patents

Abstract

PURPOSE: To maintain a prescribed quantity of metal particles existing in the suspension by controlling supply of new metal particles and washing of abrasive particles included in the abrasive slime based on the data on the density of the metal particles of larger diameter and the specific gravity of the abrasive slime. CONSTITUTION: The weight of a prescribed volume of the abrasive slime is measured by a load cell 14, and the prescribed volume of the abrasive slime is deposited in liquid, then the metal particles of larger diameter than a set point are collected. The weight of the collected metal particles is measured by a load cell 15, and the density of the metal particles of larger diameter included in the abrasive slime and the specific gravity of the abrasive slime are calculated by a processor 23. The metal particles of larger diameter are circulated again, and supply of new metal particles and washing of the abrasive particles in the abrasive mineral mud are controlled based on the data on the density of the metal particles of larger diameter and the specific gravity of the abrasive slime.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning and controlling composition of abrasive pulp used for cutting stone materials such as granite.

The invention also relates to an apparatus for carrying out the above method.

[0003]

2. Description of the Related Art Stone blocks such as granite are cut by a cutting machine having a single or plural cutting blades, and an abrasive mixture mainly based on iron particles is used as the cutting abrasive. There is. The polishing mixture, in the state of a suspension mixed with water, constantly circulates in the groove formed in the stone block by the reciprocating movement of the cutting blade. The stone block is gradually cut by the polishing action of the polishing mixture accompanying the movement of the cutting blade. The content of the object to be cut and the consumed iron powder gradually increased in the polishing ore in the circulation, and finally it became too fine-grained,
The cutting work cannot be continued effectively. New metal particles
The particle size of (metalic grit) is usually about 1 mm, but it is considered that the metal particles (metal dust) finer than the particle size of about 0.3 mm are consumed.

[0004]

There are two problems with the use of this type of polishing mixture. One is to maintain an optimum concentration of metal particles having a particle size effective for cutting in the polishing ore. The other is to remove the consumable metal dust and the dust generated from the object to be cut, and maintain the specific gravity of the polishing sludge at a constant value so that the metal particles in the suspension are present in a certain amount.

Since the amount of consumption of metal particles varies depending on the type of material to be cut, the amount of replenishment and the concentration of the polishing mud have conventionally been based on experience and experimental data. as a result,
It is difficult to optimize the composition of the polishing sludge, resulting in an increase in the consumption rate of metal particles and a decrease in cutting efficiency.

[0006] Recently, the washing of the polishing ore is generally performed by a centrifugal washing machine. But in another way,
It is practiced to separate metal particles with a magnet and then to separate particles having different particle diameters with a mechanical filter. In yet another method, backwashing of the polishing sludge is carried out with a stream of pressure wash water. The major inconvenience of these methods and other systems used in handling abrasive sludge is that they are not very reliable. That is, clogging of the filter, fluctuation of the washing water pressure, and insufficient accuracy of the washing / sorting ability of the centrifugal washing machine are unreliable. Therefore, it is quite difficult to sort out fine particles (≦ 0.3 mm) from particles larger than this. Further, in the conventional method, the amount of metal particles to be supplied must be determined in advance depending on the type of the object to be cut such as granite, and it is impossible to accurately determine the amount of metal particles to be replenished corresponding to actual wear. It was impossible.

It is an object of the present invention to provide a method for cleaning and controlling the composition of abrasive ore used for cutting stone materials such as granite, which eliminates the inconvenience of known similar methods.

In particular, the present invention makes it possible to measure the specific gravity of the polishing ore and the weight of metal particles having a particle size larger or smaller than a set value per liter of the polishing ore and for cleaning the polishing ore. Automatic control and automatic estimation of new metal particles based on the actual amount of metal particles consumed, without guessing, to obtain polishing mud that is the optimum condition for stone materials such as granite The purpose is to be able to supplement.

[0009] Another object of the present invention is to provide a device which functions by the above-mentioned method and which cleans and controls the composition of abrasive mud used for cutting stone materials such as granite.

[0010]

Means for Solving the Problem and Its Action In the method for cleaning and controlling the composition of polishing mud according to the present invention, first, the weight of a predetermined volume of polishing mud is measured, and then a solid separated product having a large particle size is obtained. The abrasive sludge is allowed to settle in the liquor for collection.

After the weight of the solid separated product is measured, the solid separated product is returned to a collecting tank arranged in a circuit in which the polishing sludge is circulated. From the weight data and volume data of the polishing mud, and the weight data of the solid separated matter of the large particle size,
The specific gravity of the abrasive mud and the actual concentration of the large size metal particles in the circulating metal mud are determined. By comparing the specific gravity and concentration with the corresponding optimum specific gravity and concentration, the amount of metal particles to be replenished and the number of washings are determined. Preferably, the calculation of the specific gravity, concentration and replenishment amount is performed by a computer. In addition to controlling the number of washings, the computer also accurately controls the course of various driving operations and also the operation of the device for weighing the replenished metal particles from time to time.

In a particularly preferred embodiment of the method of the present invention, small particle size solid isolates are also collected and weighed to determine their concentration in the abrasive sludge. Then, all or part of the small-sized solid separated product is discharged and disposed of, and the rest is recycled.

In particular, it is preferable that the separation and precipitation of a predetermined volume of the polishing ore extracted from the polishing ore circulation system be carried out in a vertically arranged cylindrical water container.

Determining the weight of the large particle size solids isolate, and optionally the weight of the small particle size solids isolate, is based on the determination of the volume of liquid containing one or the other of the solids isolates. It is expedient if done by weighing.

The reliability of this method is that the principle of separating particles having different properties (especially large particles and small particles) in the polishing mixture is only due to the difference in weight and flow resistance between large and small particles. Guaranteed by the fact that it is based. Because the speed of precipitation of metal particles is roughly proportional to the diameter of the particles, the granite dust, which has a specific gravity of 1 / 3.54 of iron, has the same speed as iron particles of much smaller diameter during precipitation. This is because the phenomenon of precipitation can be used. Therefore, granite dust with a fairly large particle size (for example, a diameter of 1 m
Even m) can be effectively separated from the metal particles.

The apparatus of the present invention comprises a tubular precipitator for separating metal particles having a particle size larger than a set value from metal particles having a particle size smaller than the set value and granite dust.

This cylindrical precipitator is appropriately formed to fill the cleaning liquid and has an inlet portion and an outlet portion. The former is the first for collecting a predetermined volume of circulating polishing sludge. The container and the latter are connected to the second container for collecting the sediment accumulated at the bottom of the cylindrical precipitator through the respective openable and closable passages. The present invention also includes a weight measuring device attached to each of the first container and the second container for measuring the weight of a predetermined volume of the polishing mud or sediment discharged from each container. Furthermore, the present invention calculates the specific gravity of the polishing sludge from the weight data and the concentration of the solid particles having a large particle size in the polishing sludge, and the sequence control of the operating procedure, the replenishment of new metal particles and the control of the number of washing It is provided with a computer control means for performing.

The features and advantages of the method for cleaning and controlling the composition of the polishing ore used for the cutting of stone materials such as granite according to the present invention, and the advantages thereof will be described with reference to the accompanying drawings, but are not limitative. It will be made clear in the following description of the non-exclusive examples.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a funnel-shaped first container 2 is installed on a vertical frame 1, and its bottom is connected via an automatic valve 3 to an inlet portion of a cylindrical precipitator 4 arranged vertically. The discharge portion of the precipitator 4 is connected to the relay tank 6 via the automatic valve 5.

The relay tank 6 is connected to a funnel-shaped second container 8 via an automatic valve 7. The bottom of this second container 8 is connected to a reservoir 10 for collecting the polishing ore in the circulation circuit via an automatic valve 9 and a conduit 11 connected to an emission treatment device or a sludge treatment device. It is designed to selectively connect to either one. The first container 2, the second container 8 and the relay tank 6 are arranged on the vertical axis of the cylindrical precipitator 4.

The first container 2 extends from the circulation circuit of the polishing ore and receives a supply from a collecting pipe 12 whose passage is opened and closed by an automatic valve 13. The first container 2 and the second container 8 are arranged so as to be weighed by the load cells 14 and 15, respectively, and the load cell 14 measures the weight of a predetermined volume of the abrasive sludge collected in the first container 2. The load cell 15 is used to weigh the precipitate collected in the second container 8.

This apparatus is provided with a cleaning liquid (particularly water) supply line 1
Connected to 6. That is, the first container 2, the precipitator 4, the relay tank 6, and the second container 8 are respectively provided with the automatic valve 1
The washing water supply line 16 is connected via 7, 18, 19, and 20. A conduit 21 having an automatic valve 22 is connected at a height from the bottom of the precipitator 4, and the conduit 21 discharges a liquid containing solid particles having a small particle size to an exhaust treatment device or a mud treatment device. I am able to do it.

The processor 23 of the computer controls the operating procedure of the device of the present invention and sends command signals to various automatic valves and receives weight data from the load cells 14 and 15. When the automatic valve 13 is opened, the polishing mud flows from the collecting pipe 12 into the first container 2, and the height of the liquid surface at the time of the inflow is controlled by the level controller 24. When the liquid level reaches the set height in the first container 2, the value of the liquid level is read and sent to the processor 23, and the automatic valve 13 is closed. Then, the weight of the contents of the first container 2 is measured by the load cell 14,
The measured value is sent to the processor 23, and the specific gravity of the abrasive sludge collected here is calculated. On the other hand, the automatic valve 18
Is opened to allow water to flow into the precipitator 4, and this flow is continued until the level controller 25 determines that the predetermined height has been reached. Meanwhile, the automatic valve 5 is open and the automatic valve 7 is closed. Then, the opening of the automatic valve 3 was ordered,
The abrasive sludge in the first vessel 2 is dropped into the water in the settler 4, where the large particle size metal particles are separated from the small particle size particles and collected in the relay tank 6. Automatic valve 3
After a predetermined time has passed after the opening of the automatic valve 5, the automatic valve 5 is closed to prevent fine and light particles from flowing into the relay tank 6.

After that, the automatic valve 7 is opened and the relay tank 6 is opened.
The metal particles therein are dropped into the second container 8. Water is supplied to the second container 8 by opening the automatic valve 20,
This water supply is continued until the level controller 26 determines that the liquid level has reached a predetermined height. Second container 8
The weight of the contents is measured by the load cell 15, the value is sent to the processor 23, and the weight of the metal particles having a large particle size per liter of the polishing ore, that is, its concentration (g / 1) is calculated. When the measurement is completed, the automatic valve 9 is opened, and the weighed metal particles are returned to the polishing ore storage section in the circulation circuit through the conduit 10.

The cleaning of the relay tank 6 and the second container 8 is performed by temporarily opening the automatic valves 19 and 20. Meanwhile, the valve 22 is also opened, and the suspension in the precipitator 4 is discharged through the conduit 21, while at the same time, the small-sized metal particles are collected at the bottom of the precipitator 4.

Therefore, the automatic valve 5 is newly opened, metal particles having a small particle size are caused to flow into the relay tank 6, and then the automatic valve 7 is opened to send the particles to the second container 8. Here, the weight of the small-sized metal particles is measured by the load cell 15 by the same method as that of the large-sized metal particles, and the measured value is sent to the processor 23. Then, here, the concentration of small-sized metal particles in the polishing ore is calculated.

At the end of this operating cycle, the automatic valves 17, 18, 19, 20 are temporarily opened to quickly clean each container and each conduit. The wash water is then sent to the waste treatment device through the conduit 11.

The actual concentrations of the large and small metal particles thus measured are compared with prestored optimum values, respectively, and the processor 23 is based on the result of this comparison. Tells the metering device D (not shown) the amount of new metal particles to be added to the circulating polishing sludge,
Let them replenish it. Also, particles of small size are returned to the abrasive ore deposits in the circulation circuit via conduit 10 or removed from the circulation circuit via conduit 11.

FIG. 2 shows one simple modification of the device of the present invention. In this modification, the concentration of small metal particles cannot be directly measured or recycled. In this variant, the large-sized metal particles collect at the bottom of the precipitator 4, and the suspension containing the small-sized metal particles and the granite dust is discharged to the outside of the precipitator 4 via the discharge conduit 21. After that, the automatic valve 5 is opened to flow directly into the second container 8 and its weight is measured by the method described above. The preferable separation of the large-sized metal particles is obtained by adjusting the timing of the flow of the polishing sludge into the precipitator 4 and the timing of opening the automatic valve 22.

In the embodiment used in the method of the present invention, a cylindrical precipitator 4 having a diameter of 0.3 m and a height of 2.5 m was adopted. Then, 40 liters of the polishing mud was taken in from the circulation circuit, and the weight in the first container 2 was measured by using the load cell 14. As a result, the specific gravity of the polishing mud was 1,650 g /
It was l. As a result of measuring the weight in the second container 8, there were 2,400 g of large-sized metal particles considered to have a particle size of 0.3 mm or more in the introduced polishing ore, and the particle size was 0.3 m.
It was revealed that there were 4,000 g of small-sized metal particles considered to be m or less. Therefore, the concentration of the metal particles of the larger particle size in the circulating polishing ore is 60 g / l,
This was an acceptable number for granite cutting. The concentration of metal particles with a smaller particle size is 100 g /
It was l. As a result of analyzing each of the large and small particle size separations,
It became clear that 10% of the larger particle size particles were mixed in the smaller particle size particles, and 10% of the smaller particle size particles were mixed in the larger particle size particles. It was Considering that the granite dust is completely washed and removed from the metal particles having the larger particle diameter, the above-mentioned separation rate of 90% is considered to be preferable. This separation rate can be further improved by optimizing various parameters of the control process.

In each of the above-described embodiments of the present invention, the weight of a predetermined volume of liquid containing metal particles having a large particle size, which is discharged from the precipitator 4, is weighed.
It is also clear that the weight measurement of the large particle size metal particles can be carried out directly after mechanically filtering out the water. It is also clear that the first container 2 and the second container 8
The liquid level can be controlled by overflowing the excess inflow liquid instead of using the measuring device. This overflow method uses the container 2,
8 under weight measurement. That is, if the weight does not seem to increase, it means that the excess inflow liquid has begun to overflow, so that the supply of the liquid can be stopped and at the same time the final weight of the containers 2, 8 can be known. Instead of using a load cell, reading the height of the particles deposited in the second container 8 and measuring the strength of the magnetic field proportional to the amount of metal particles are also used for the weights of the large and small particle size solids. It can be measured by an indirect method by measuring the change.

In the method and apparatus for controlling the composition and cleaning of the polishing mud used for cutting stone materials such as granite of the present invention, any modification or modification can be made without departing from the scope of the present invention. .

[0033]

According to the present invention, the specific gravity of the polishing ore mud is measured, and the polishing ore of metal particles having a particle size larger than the set value (in addition to this, metal particles having a particle size smaller than the set value in some cases) is used. It enables the measurement of the concentration in mud, the automatic control of the polishing ore mud washing, and the actual consumption of metal particles without guessing, and the optimum conditions for stone materials such as granite. It is possible to provide a method and a device for controlling the cleaning and composition of the polishing mud used for cutting stone materials such as granite, which can automatically replenish new metal particles so as to obtain the following polishing mud.

[Brief description of drawings]

FIG. 1 is a front view of an apparatus used in an embodiment of the present invention.

FIG. 2 is a front view of an apparatus used in another embodiment of the present invention.

[Explanation of symbols]

2 First container 4 Precipitator 6 relay tank 8 second container 14,15 load cell 16 Cleaning liquid supply line 21 conduit 24, 26 level controller

Claims (12)

[Claims] 1. A method for cleaning and controlling the composition of an abrasive sludge containing metal particles having a particle size larger than a set value and metal particles having a particle size smaller than a set value together with stone dust.
A step of measuring the weight of a predetermined volume of the polishing sludge, a step of precipitating the predetermined volume of the polishing slurry in a liquid, and collecting metal particles having a particle size larger than a set value; and the collected metal particles. And a step of measuring the weight of the polishing ore and the weight data of the polishing ore and the weight data of the metal particles of the large size, to calculate the concentration of the metal particles of the large size in the polishing and the specific gravity of the polishing ore. Based on the process, the step of recycling large-sized metal particles, the concentration data of large-sized metal particles and the specific gravity data of the polishing mud, the supplement of new metal particles and the polishing particles in the polishing mud A method of controlling the composition and cleaning of polishing mud used for cutting stone materials such as granite, which comprises a step of controlling cleaning. 2. Metal particles having a particle size smaller than a set value are separated and collected, and the weight thereof is measured, whereby the concentration of the metal particles having a small particle size in the circulating polishing sludge is estimated to obtain a small particle. The polishing ore used for cutting stone materials such as granite as claimed in claim 1, further comprising a step of recycling any amount of the metal particles having a diameter of 0 to 100%. Method for cleaning mud and controlling composition. 3. The cleaning and composition of the polishing mud used for cutting stone materials such as granite as claimed in claim 1 or 2, wherein a predetermined volume of the polishing mud is supplied to a cylindrical container containing water. Control method. 4. The metal particles having a large particle diameter and the metal particles having a small particle diameter when the metal particles are collected are collected together with water, and a predetermined volume containing water is weighed. 1. A method for cleaning abrasive mineral mud used for cutting stone materials such as granite or the like according to 1, 2, or 3, and controlling the composition. 5. The large particle size metal particles and the small particle size metal particles when collected are characterized in that the water in the suspension is weighed after being filtered out. A method for cleaning and controlling the composition of a polishing mud used for cutting stone materials such as granite, according to claim 1, 2 or 3. 6. An apparatus for cleaning and controlling the composition of a polishing ore containing metal particles having a particle size larger than a set value and metal particles having a particle size smaller than a set value together with stone dust, and a metal particle having a large particle size having a small particle size It has a cylindrical precipitator 4 for separating it from metal particles and stone dust, and this precipitator 4 can contain a cleaning liquid, and its inlet portion is for taking in a predetermined volume of polishing mud in the circulation circuit. First container 2
And the connection passage so that the connection passage can be opened and closed, and the discharge portion is connected so that the second passage 8 for receiving and collecting the sediment accumulated at the bottom of the precipitator 4 and the connection passage can be opened and closed. And a weight measuring unit 1 attached to the first container 2 for measuring the weight of the above-mentioned predetermined volume of the polishing sludge.
4 and is attached to the second container 8 to provide the second container 8
Weight measuring means 15 for measuring the weight of the precipitate collected in
Further comprising calculating the specific gravity of the polishing ore from the weight data, and the concentration of large-sized metal particles in the polishing ore, a series of operating procedures and supplementation of new metal particles,
A control device for cleaning and composition of abrasive ore used for cutting stone materials such as granite, characterized by comprising a data processing means 23 for controlling the number of times of cleaning. 7. The precipitator 4 has a portion 6 at the bottom thereof which is temporarily cut off from the top, and the cleaning and composition of the polishing ore mud used for cutting stone materials such as granite. Control device. 8. The second container 8 has two different and alternately selectable discharge conduits 10, 11, one connected to the abrasive sludge collector in the circulation circuit and the other to an exhaust treatment device or mud. 7. A processing device connected to a processing device.
Or a device for cleaning and composition of abrasive ore used for cutting stone materials such as granite as described in 7. 9. The method for cutting stone material such as granite according to claim 6, 7 or 8, wherein a discharge conduit 21 that can be opened and closed is provided at a height from the bottom of the settler 4. Equipment for cleaning and composition of polishing ore used. 10. The first container 2, the second container 8, the precipitator 4 and the bottom partial disconnection part 6 of the precipitator are respectively connected to a cleaning liquid supply network 16 via an openable / closable passage. Item 6. A device for cleaning abrasive composition and controlling composition, which is used for cutting stone materials such as granite, according to 6, 7, 8 or 9. 11. The cylindrical precipitator 4 is provided on a vertical axis, and the first container 2 and the second container 8 are provided on the vertical axis. 7, 8, 9
Or a control device for cleaning and composition of abrasive ore used for cutting stone materials such as granite. 12. The liquid level of the first container 2 and the second container 8 is controlled by level controllers 24, 26, and the liquid level is controlled in any one of claims 6, 7, 8, 9, 10 or 1.
1. A control device for cleaning and composition of abrasive ore used for cutting stone materials such as granite.