JP6500811B2 - Residue cake height measuring instrument and method of measuring precipitating cake height - Google Patents

Description

  The present invention relates to a deposit cake height measuring device for obtaining a control index and a method for measuring the deposit cake height when reducing residues after filtration processing such as contaminated slurry.

  Vernier calipers and height gauges are known as height measuring devices for measuring the height of articles. Among these calipers and height gauges, there are known ones in which the working efficiency of measurement is enhanced by attaching various jigs and the like according to the shape and purpose of the object to be measured.

  For example, at the end of the vernier caliper, an auxiliary block for stability having a width and thickness sufficient to prevent the caliper of the caliper erected at the time of depth measurement, one side of which is the same surface as the depth reference plane of the major end A vernier caliper with an auxiliary block for measuring the depth, which is attached in a manner to make it, is known (Patent Document 1).

  There is also known a height measurement stand suitable for measurement of heights of beverage cans and the like which can be easily carried and easily and accurately measured (Patent Document 2). Specifically, the entire surface of the fixed jaw located on the main gauge surface of the digital caliper and the tip of the caliper is fitted in the grooved opening formed from the side to the center of the fixed base having a horizontal plate surface. While inserting and fixing, it is what set the plate upper surface of the fixed stand to zero.

Japanese Utility Model Application Publication No. 56-51005 Japanese Utility Model 7-38803

However, the caliper with depth measurement auxiliary block disclosed in Patent Document 1 is a caliper that can stably and accurately measure the depth of a hole or a level difference, and specializes in a deposit cake height measuring device. It is not something that
In addition, the height measuring stand disclosed in Patent Document 2 is a height measuring stand suitable for measuring heights of beverage cans and the like, which is also an improvement because it is not specialized for a cake height measuring device. There was room.

  The present invention has been made in view of the above problems, and when making cylindrical deposit cakes to be reduced, the deposit cake height that enables simple and accurate measurement of the deposit cake height as a control index. It is an object of the present invention to provide a measuring device and a method for measuring the height of a cake of sediment.

One embodiment of the present invention is a deposit cake height measuring instrument for measuring the height of a deposit cake having irregularities on a cylindrical surface, the book being capable of displaying a distance spaced from an end serving as a reference position. And a vernier slidably supported in the length direction of the vernier, and slidable integrally with the vernier so that a distance projected from the end of the vernier can be directly read. A depth bar and an abutment portion extending from the end by a predetermined length at right angles to the length direction of the main scale, and the plane including the bottom surface of the cake is orthogonal to the depth bar while the tip of the Depusuba is matched with the surface when the distance measured by contacting the contact portion to the top of the sediment cake and lees cake height of the cylindrical, the contact portion The predetermined length is measured as a length corresponding to the radius of the deposit cake .

  In the deposit cake height measuring device according to one aspect of the present invention, the caliper having the main scale, the sub scale, and the depth bar, and the end portion at a right angle to the length direction of the main scale. And a contact portion extending by the predetermined length.

  In the deposit cake height measuring device according to one aspect of the present invention, there are various types of the contact portions which are adapted to the radius of the deposit cake having different sizes and at least the predetermined length is changed. The apparatus was configured to be replaceable with respect to the main scale.

  In the deposit cake height measuring device according to one aspect of the present invention, the contact portion is a right triangle, and one side of two sides sandwiching the right triangle of the right triangle is aligned in the length direction of the main scale. The other side extends from the end by the predetermined length and does not interfere with the sliding stroke of the vernier supported on the main scale.

  In the deposit cake height measuring device according to one aspect of the present invention, the contact portion is made of a resin, and the resin is defined by a color circle with respect to the surface color of the deposit cake to be measured. It was composed of one that developed a surface color related to a complementary color.

  Moreover, one aspect of the present invention is a method for measuring the height of a sediment cake, which is performed to process and manage a cylindrical sediment cake formed of a residue after filtration treatment, wherein the sediment cake is transferred to a horizontal measurement table. The step of moving the sediment cake for moving and placing, and the depth bar which is extended on the movable sub-slab which is slidable with respect to the main scale constituting the caliper, from the end of the main scale to the height of the sediment cake In the depth bar projecting step of making the measurement preparation by making it project sufficiently long, and among the measurement positions that are dotted by dividing the circumference defined to surround the bottom surface of the deposit cake placed on the measurement table by N A depth bar positioning step of bringing the tip of the depth bar into contact with one point at which an unmeasured point is selected, and extending a predetermined length at a right angle to the length direction of the main scale while holding the depth bar vertically The tip of the contact portion is in the upper surface of the cake A step of moving the scale down in the direction of lowering the scale, a step of contacting the top with the top portion of the cake, and a step of contacting the top with the top portion; The height at which the depth bar reads the distance from the end of the main scale as the height of the deposit cake based on the value displayed based on the relative positional relationship between the main scale and the sub-scale And a reading step, and after the height reading step, the deposit cake height is measured by repeating the process from the depth bar projecting step to the height reading step a total of N times.

  In the deposit cake height measuring method according to one aspect of the present invention, the division number N of the circumference defined in the measurement table is eight, and the measurement position is dotted over eight spots. It is a method of measuring the object cake height.

  As described above, according to the present invention, a deposit cake height measuring device capable of easily and accurately measuring the deposit cake height, which is a control index, when reducing cylindrical deposit cake. And a method of measuring cake height can be provided.

It is a front view which shows the use condition of the deposit cake height measuring device which concerns on one Embodiment of this invention. It is the perspective view which showed the sediment cake height measurement method which concerns on one Embodiment of this invention. It is a top view for demonstrating changing a measurement position over eight places. It is a flowchart for demonstrating the procedure of the sediment cake height measurement method shown to FIGS. 1-3. It is a front view which shows the deposit cake height measuring device which concerns on other embodiment. It is a graph which shows the time-dependent change of the neutralization deposit height in natural drying.

  Hereinafter, preferred embodiments of the present invention will be described in detail. Note that the present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all of the configurations described in the present embodiment are essential as means for solving the present invention. Not necessarily.

  FIG. 1 is a front view showing a state of use of a sediment cake height measuring device (hereinafter, also referred to as “this device”). As shown in FIG. 1, the main unit 100 measures the height H of the cake 31 placed on the XY plane. The sediment cake 31 is basically cylindrical, and with the bottom surface 32 placed on the XY plane, the distance Z measured using the device 100 vertically is the cylindrical sediment cake height H and Do. However, the upper surface 33 and the outer peripheral surface of the cake 31 have cracks and irregularities.

  The main component of the main unit 100 is a vernier caliper 17 having a contact portion 19 attached thereto as an attachment. That is, in addition to the caliper 17 configured to have the main scale 12, the sub scale 13, and the depth bar 14, the main unit 100 extends from the end portion 11 of the main scale 12 at right angles to the length direction of the main scale 12. It is configured to include an abutting portion 19 that extends by a predetermined length X. In addition, although length X of the contact part 19 is made into the length to the front-end | tip of the contact part 19 on the basis of any one surface among the scale 12 or the depth bar 14, it is not necessary to be rigid. The fixing screw 18 is appropriately tightened and used to stop and fix the slide of the sub scale 13 with respect to the main scale 12.

  The details of the parts constituting the device 100, including the vernier caliper 17, are as follows. The scale 12 can display the distance Z separated from the end 11 serving as the reference position. The vernier 13 is slidably supported in the longitudinal direction of the scale 12. Since the depth bar 14 can slide integrally with the sub scale 13, the distance Z where the depth bar 14 protrudes from the end 11 of the main scale 12 is expressed as the distance Z at which the sub scale 13 deviates from the main scale 12 Ru. That is, the distance Z is displayed based on the relative positional relationship (displaced distance) of the vernier 13 with respect to the main scale 12. At this time, the display of the distance Z may be any of a vernier scale not shown, a dial pointer or a digital display.

  Since the contact portion 19 attached to the caliper 17 extends a predetermined length X at right angles to the length direction of the scale 12 and the depth bar 14, the contact portion 19 is separated from the scale 12 and the depth bar 14. It is also made to abut on a certain measurement object. About the effect, it is the same as that of a height meter not shown. That is, the slidable contact portion on the main scale of the height scale extends at right angles to the main scale by the depth length of the human head. Therefore, even if the head of a person has a spherical shape, the height gauge has the effect that the height can be measured accurately and easily simply by bringing the abutment portion lightly into contact with the top. The contact parts 19 and 20 (FIG. 5) in the main unit 100 and 101 (FIG. 5) are, for example, the edges of the edges 22 (FIG. 5) and 24 defining the end 11 of the scale 12 with a knife edge. It has a shape. The knife edge shape may be either single-edged or double-edged.

  FIG. 2 is a perspective view showing a method for measuring the height of a cake of cake according to an embodiment of the present invention (hereinafter, also referred to as “the present method”). As shown in FIG. 2, this unit 100 and the present method are used to process and manage a soft sample to be measured that is removed from the solid-liquid separator (filter tank) 40, that is, the sediment cake 31. The height H is measured in accordance with the management specification. The filtration tank 40 schematically illustrated includes a cylindrical filtration recess 41 having a radius R (for example, R = 12 cm), and the filter paper 44 is laid along the inner circumferential surface of the filtration recess 41. In addition, the sediment cake 31 of FIG. 2 includes not only those immediately after being taken out from the filtration tank 40 but also those after several tens of days have been taken out.

  A slurry to be treated or the like is poured into the filtering recess 41 on which the filter paper 44 is placed, and is dehydrated and compressed, so that a sediment cake 31 of radius R is formed. The sediment cake 31 is taken out of the filtration tank 40 and reduced in volume (reduced) by natural drying. The sediment cake 31 whose desired weight reduction has been achieved in many days is disposed of as a burying disposal or industrial waste with measures to seal harmful poisons. The vessel 100 and the method are used to measure the cake height H in order to obtain a control index until the desired weight reduction is achieved. The following more specifically describes.

  The container 100 measures the height H from the bottom surface 32 of the cake 31 to the top 34 of the top surface 33. First, in a state in which the plane XY including the bottom surface 32 of the cake 31 and the depth bar 14 are orthogonal to each other, the tip 15 of the depth bar 14 is aligned with the plane XY (measurement stand 42). Then, the contact portion 19 is brought into contact with the top portion 34 of the upper surface 33 of the cake 31 and the height H is measured. At this time, the measurer does not have to search the top 34 over the entire top surface 33 of the cake 31. As described later with reference to FIG. 3, if measurement is performed according to the management specification, work is completed efficiently and promptly even if the measurer changes. Therefore, according to the main unit 100 and the present method, the height H of the cylindrical pellet cake 31 having irregularities on the surface can be measured easily and accurately.

  The contact portion 19 of the main unit 100 is exchangeable and is like an attachment. It is preferable that the predetermined length X of the contact portion 19 be set to a length that matches the radius R of the cake 31. Therefore, in order to make the main body 100 conform to the radius R of the cake 31 of different sizes, various types of contact portions 19 having different lengths X at least are prepared, and replacement with the scale 12 is performed. It is further preferred that it be flexible. In that case, each contact portion 19 is removable if it has a common fitting portion at its root. Furthermore, as described later with reference to FIG. 5 for the other main unit 101, the contact portion 20 may be a right triangle, instead of the rectangular contact portion 19. Regardless of the shapes of the contact portions 19 and 20, if it is not necessary to distinguish many kinds of the radius R of the cake 31, it is not removable. It may be pasted.

  As shown in FIG. 2, since the deposit cake 31 is cracked by the progress of drying and has unevenness on the surface, the visibility of the contact portion 19 is kept good from the viewpoint of measurement accuracy and work efficiency Is required. For this reason, the contact portion 19 of the main unit 100 is made of a resin that develops a surface color of a complementary color relationship defined by a hue circle with respect to the surface color of the sediment cake 31 to be measured.

  As used herein, complementary color refers to a combination of colors in a relationship diametrically opposed in a color circle. For example, complementary colors such as "red / blue-green", "purple / yellow-green", and "yellow / blue-purple" are also included. Also referred to as overcolor, contrast color, and opposite color.

  For example, if the sediment cake 31 is yellowish, the contact portion 19 is colored in blue to make it stand out, so that it has an effect of maintaining good visibility. Similarly, if the sediment cake 31 is black, it is desirable to provide contrast by forming the contact portion 19 white with a resin such as polyethylene.

  The material and mounting method of the contact portion 19 are not particularly limited as long as the length direction X (sides 22 and 24) can maintain a right angle with the length direction of the scale 12 and the depth bar 14. As an example, good results were obtained by attaching a translucent hard plastic (for example, polystyrene, polypropylene, polyethylene or the like) to the end portion 11 of the scale 12 with an adhesive as the material of the contact portion 19. That is, it is easy to visually recognize that the translucent abutment portion 19 abuts on the top portion 44 of the cake 31. As a result, even when the cake 31 is very soft, the cake 31 is It is possible to minimize the deformation given to the shape.

  FIG. 3 is a plan view for explaining changing the measurement position over eight points. In carrying out the method shown in FIGS. 1 and 2, the end 15 of the desp bar 14 of the vessel 100 is brought close to the periphery of the bottom 32 of the cake 31. Measurement positions are set at eight positions with respect to the peripheral portion. The measurement of the sediment cake height H is completed by making the measurement positions over these eight positions go round. On the horizontal measurement table 42 on which the cake 31 is placed, a circle (also referred to as a "circumferential") 43 having a radius R is clearly indicated in the same size as the bottom 32 of the cake 31. The circle 43 of the radius R is a mark for guiding the deposit cake 31 to be placed at a position convenient for measurement. Measurement positions 1 to N defined to divide the circumference 43 into N equally are scattered over N points.

  Here, the division number N = 8 of the circle (circumference) 43 is described as an example. That is, eight measurement positions 1 to 8 are set so as to divide the circumference 43 into eight equal parts at a central angle of 45 degrees. The setting of eight locations is optimum in terms of making the actual measurement work accurate and efficient. The measurement positions 1 to 8 are marks that the measurer abuts on the tip 15 of the depth bar 14 when measuring the height H of the cake 31 using the main unit 100. The circles 43 and the measurement positions 1 to 8 may be specified by printing directly on the surface of the measurement table 42 or the like, or a dedicated floor sheet 45 printed with the same content may be used.

  In addition, in the management specification, if it is not specified that “a central angle of 45 degrees is 8 equal parts for the measurement positions 1 to 8”, measurement is performed while changing the measurement positions 1 to 8 over eight points by the measure of the measurer. It does not matter if you do. Therefore, the circle 43 and the measurement positions 1 to 8 may not necessarily be clearly indicated on the measurement stand 42 or on the web 45.

The procedure of the method is described in detail below.
FIG. 4 is a flow chart for explaining the procedure of the method shown in FIGS. The present method is a method of measuring the height H according to the management specification in order to process and manage the soft measurement object taken out of the filtration tank 40, that is, the sediment cake 31 so as to reduce the amount thereof.

  As shown in FIG. 4, the method includes a cake moving step (S10), a depth bar projecting step (S20), a depth bar positioning step (S30), a scale lowering step (S40), and a top contact step. (S50), a height reading step (S60), a count-up step (S70), and a measurement number confirmation step (S80) are executed.

  In addition, after the height reading step (S60), the process from the depth bar protruding step (S20) to the height reading step (S60) is repeatedly performed a total of N times (cycles) as one cycle. As one example, it is preferable to execute N = 8 repeatedly for a total of eight times. First, starting from the number of times of measurement n = 0, every time of measurement of one cycle, the count-up step (S70) counts up to n = n + 1. If n <N in the number-of-measurements confirmation step (S80), the process returns to the depth bar protrusion step (S20) to repeat the measurement. If n = N in the number of times of measurement confirmation step (S80), the measurement is completed without leakage for N points of the measurement positions 1 to N based on the management specification, and the method ends. In addition, in FIG. 4, it is abbreviate | omitting about the operation | work which registers the measured value of N places, respectively, or calculates an average value.

  Each step will be described in more detail below. Prior to the deposit cake transfer step (S10), the contaminated slurry or the like to be treated is formed in a cylindrical deposit cake 31 formed of the residue after the filtration process in the filtration tank 40. . Since the filtration tank 40 has a cylindrical filtration recess 41 of radius R, the sediment cake 31 dewatered here is formed in a cylinder of radius R along the shape of the filtration recess 41.

  In the deposit cake transfer step (S10), the deposit cake 31 is moved from the filtration tank 40 or a dry mud (not shown) (storage place in the sun) to a horizontal measurement table 42 and mounted. That is, the sediment cake 31 to be measured is placed on the measurement stand 42 so that the circular bottom surface 32 matches the circle 43 defined on the measurement stand 42. A circular bottom surface 32 can be accommodated in the circle 43. In the next depth bar projecting step (S20), the depth bar 14 is protruded to prepare for measurement. That is, the depth bar 14 extended to the movable sub-sliding 13 slidable with respect to the main scale 12 constituting the caliper 17 is sufficiently larger than the height H of the cake 31 from the end 11 of the tip of the main scale 12 Stand out for a long time to prepare for measurement.

  In the next depth bar positioning step (S30), the tip 15 of the depth bar 14 is brought into contact with one of the measurement positions 1 to N at which the unmeasured portion is selected. The sediment cake 31 at this stage is placed with the bottom surface 32 aligned with the circle 43 on the measurement table 42. The measurer abuts the tip 15 of the depth bar 14 on one point at which the unmeasured part is selected from among the measurement positions 1 to N dispersed by dividing the circle 43 on the measurement table 42 into N parts. Since the measurement positions 1 to N are dotted by dividing the circumference 43 evenly, there is an effect of reducing the bias of the measurement result.

  The next main scale lowering step (S40), the top contact step (S50) and the height reading step (S60) are continuously performed as follows. That is, the contact portion 19 is gradually brought close to the upper surface 33 from above the sediment cake 31 (S40), and a part of the contact portion 19 abuts on the sediment cake 31 (S50), The sediment cake height H is measured by reading the scale of the vernier calipers 17 (S60).

  As described above, in the measuring step (S40), the measuring lever 12 is slid in the direction in which the measuring lever 12 is lowered with respect to the fixed depth bar 14. In the next top contact step (S50), the contact portion 19 is brought into contact with the top 34 of the cake 31. At this time, the depth bar 14 is vertical, and the tip 25 of the contact portion 19 is held in a state of being directed to the center O of the upper surface 33 of the cake 31. The contact portion 19 is extended by a predetermined length X at right angles to the longitudinal direction of the scale 12. Here, X = R, that is, the predetermined length X is approximately equal to the radius R of the cylindrical cake 31. Therefore, as shown in FIGS. 1 and 2, the tip 25 of the contact portion 19 approaches the center O of the upper surface 33 of the cake 31.

  In the present embodiment, the vernier caliper 17 is vertical when the abutment portion 19 provided at the end portion 11 of the vernier caliper 12 abuts on the top portion 34 of the sediment cake 31 in the top abutment step (S50). Need to be fixed. Although illustration for that purpose is omitted, for example, the vernier 13 of the vernier caliper 17 is freely held and fixed to the experimental instrument stand with a scissors. In this state, it is preferable to attach a swing weight to the linear portion of the scale 12 and fix it in the vertical direction. As a result, since the entire caliper 17 can be accurately and easily fixed in the vertical direction, more accurate measurement results can be obtained.

  In the height reading step (S60), the distance Z at which the depth bar 14 protrudes from the end portion 11 of the scale 12 in the top contact step (S50) is based on the relative positional relationship between the scale 12 and the scale 13. The displayed scale or numerical value is read as the height H of the cake 31. At this time, either a linear scale-like scale may be read directly, a dial pointer may be read, or a digitally displayed number may be read.

  In addition, after the height reading step (S60) described above, the process from the depth bar protrusion step (S20) to the height reading step (S60) is repeatedly performed a total of N times (cycles) as one cycle. Based on an example of the management specification, the guide 43 is a guide diagram such that the circumference 43 is divided into eight by the division number N = 8 and the measurement positions 1 to 8 are scattered over eight locations on the measurement stand 42 or the dedicated floor sheet 45 Is drawn.

  In this case, it is defined that N = 8, and the process is repeatedly performed a total of eight times (cycles). If it is repeatedly executed a total of eight times (cycles) by the count-up step (S70) and the number-of-measurements confirmation step (S80) according to the regulation, the measurement operation of one sediment cake height H by this method Finish. Depending on the management specification, any one of N = 2 to 16 may be appropriately selected and defined. As described above, according to the present device 100 and the present method, even when the measurer changes, continuity can be obtained by using the average value measured while changing the measurement positions 1 to N over N points. Measurement values that do not compromise the

  FIG. 5 is a front view showing a cake height measuring instrument (main instrument) according to another embodiment. As shown in FIG. 5, in the main unit 101, the contact portion 20 is a right triangle. Of the two sides 21 and 22 sandwiching the right angle of the right triangle, one side 21 is aligned in the length direction of the scale 12, and the other side 22 extends from the end 11 by a predetermined length X. Also, the contact portion 20 is configured not to interfere with the sliding stroke 16 of the vernier 13 required by the main scale 12.

  The deposit cake height measuring device and the deposit cake height measuring method according to the present embodiment are applied to treatment management associated with the detoxification treatment of continuously generated water. That is, when reducing the sediment cake produced | generated by the filtration process of anti-water, the sediment cake height H is measured as a control index. In addition, the precipitates are generated in various industrial processes, transferred as waste to a waste disposal process and processed, or transferred as valuables to a valuables recovery process and processed. Hereinafter, only the treatment of the well water will be briefly described.

  In the case of a working metal mine, it may be possible to provide economically favorable conditions by treating the drilling water within a closed system of mining activities that produces profits. However, the treatment of mine water in closed mines is a one-sided burden. Therefore, also from the viewpoint of cost reduction, it is important to reduce the burden until final disposal by reducing sediment as waste as much as possible.

For example, the anti-water treatment process mines where mine water annually several hundreds of thousand m ³ occurs, for neutralization and Sui, to produce a neutralized precipitate to solid-liquid separation. This neutralized sediment is transferred to dry mud (storage place), naturally dried to about 70% moisture content over about one year, and further transferred to a waste disposal site (deposition place) and deposited. It is done. In order to reduce transfer costs or to prolong the life of the waste disposal site, it is important to reduce the amount of deposits (reduction in volume).

  In order to reduce the amount of sediment, there is a method of introducing a drying facility to reduce the moisture content of the sediment. The drying equipment is disadvantageous in that it is added to a burden for processing exhaust gas discharged from the drying equipment, in addition to an introduction burden, an operation energy burden, a human burden such as an operator.

  If the above-mentioned drying equipment is not introduced, the operating conditions of the existing equipment, that is, the conditions of the neutralization reaction and the solid-liquid separation conditions are adjusted to confirm the amount of precipitation and characteristics of natural drying, A test to reduce the amount of material is required. In particular, in order to investigate the characteristics of natural drying, it is necessary to grasp the weight and volume of the sediment cake 31 immediately after solid-liquid separation and each time a predetermined drying time has elapsed. For this reason, the main unit 100, 101 and the present method are suitably used. The following more specifically describes.

  In the above-described solid-liquid separation operation, the slurry after the neutralization reaction is separated into a filtrate and a deposit, for example, by filtration dehydration processing using the filter paper 44 corresponding to the recess 41 having a diameter of 24 cm. Here, the obtained sediment cake 31 is soft due to a wet state, and the measurement of the diameter and height H is difficult to obtain reliability unless the measurement is continued based on any management specification. Problems remain, particularly in terms of continuous consistency over several tens of days.

  In addition, the upper surface 33 of the cake 31 having a cylindrical shape often can not maintain its flatness when drying progresses. Therefore, it is necessary to perform statistical processing to represent the height H by the average value of the height H measured at a plurality of measurement points 1 to 8 along the peripheral portion. Thus, the progress of reduction over time due to natural drying is managed by the value of height H of the cake 31. It is necessary to process and manage unstable measurement conditions on a unified basis for the flexible and deformed sediment cake 31.

  Also, it is difficult to maintain consistent and uniform metrics in the measurement of the height H of the cake cake which is flexible and deformed as described above. For example, the top portion 34 which is considered to be easily formed at the peripheral portion of the cake 31 is not necessarily always formed at a fixed position. On the other hand, it is not necessary to seek an excessively rigorous judgment as to whether or not the peak of the top 34 should be consciously captured and measured each time of measurement. Therefore, when the measurer changes, the consistency can not be maintained, and the accuracy as a management index also decreases.

  Therefore, by reducing the cylindrical sediment cake 31 consisting of the residue after filtration processing of the contaminated slurry or the like by using the present apparatus 100 and 101 according to the present method, the sediment cake height serving as a control index is used. H can be measured easily and accurately.

The embodiment will be described below with reference to FIGS. 2 and 6 and Table 1. The example is distinguished by the case where two types of neutralizing agents were used for one type of processing object, and each result is shown.
Common conditions are as follows.
<Cake cake>
After suction filtration with a filter paper 44 corresponding to a diameter of 24 cm, the produced sediment cake 31 was taken out together with the filter paper 44 and placed on a measurement table 42 (FIG. 2).
<Neutralization deposit>
Neutralized acid pitted water obtained from domestic abandoned mines.
<Neutralizer>
Two types of calcium hydroxide Ca (OH) ₂ and sodium hydroxide NaOH are used.

Table 1 is a target for treating one kind of acid mine water, and each neutralized starch obtained using calcium hydroxide Ca (OH) ₂ and sodium hydroxide NaOH as two kinds of neutralizing agents. That is, the height H (mm) of the precipitate cake 31 shows the time-dependent change to be reduced by dividing by the number of days by natural drying after suction filtration.

FIG. 6 is a graph showing the time-dependent change of the neutralization deposit height in natural drying. As shown in FIG. 6, with respect to the precipitate cake height H, the Ca (OH) ₂ neutralized precipitate is thinner than the NaOH neutralized precipitate from the beginning, and both are dried after 24 days, with their initial heights, respectively. It has shrunk from H to about 1/3. In addition, the drying period of the NaOH neutralized precipitate is twice as long as that of the Ca (OH) ₂ neutralized precipitate.

<Measurement method>
It is as having demonstrated using FIGS. 1-4, and is especially according to the procedure shown to the flow cheat of FIG. That is, with regard to the height H (mm) of the cylindrical pellet cake 31 having a radius R = 12 cm, the measurement position 1 set immediately before the peripheral portion every time it moves eight places at regular intervals while following the peripheral portion Each sediment cake height H (mm) was measured in -8.

  At this time, the caliper 17 with the depth bar 14 protruding from the end 11 of the scale 12 is vertically supported, and the contact portions 19 and 20 are slid downward with the tip 15 of the depth bar 14 in contact with the depth bar 14 , And abut against the apex 34 of the cake 31. At that time, the fixing screw 18 is appropriately tightened to fix the sub scale 13 so as not to slide, and the relative separation distance Z of the sub scale 13 with respect to the main scale 12 is read by the main scale 12.

  The length X of the contact portion 19 is a length corresponding to the radius R of the cake 31. The measurement in which the contact portion 19 is held horizontally from the peripheral portion of the cylindrical sediment cake 31 toward the central portion O is defined as one cycle. With respect to the measurement positions 1 to 8 of the cake height H, measurement is performed for 8 cycles while moving along the peripheral portion by 45 ° at a central angle. As described above, if horizontal measurement is performed from each position obtained by equally dividing the peripheral portion of the cake 31 into eight toward the central portion O, overlapping of measurement positions can be avoided and bias can be reduced. As a result, it becomes easier to obtain more reliable management indicators.

  As described above, according to the present invention, it is possible to easily and accurately measure the height of the sediment cake, which is a control index, when reducing the cylindrical sediment cake consisting of the residue after the filtration processing of the polluted slurry etc. It is possible to provide a deposit cake height measuring device and a method for measuring the deposit cake height.

  The present invention may be used as a means for obtaining a control index on the degree of drying, in order to reduce the amount of residue left after filtration treatment such as contaminated slurry. In particular, it may be suitably used as a management means for residues that need to be reduced to increase the storage efficiency of disposal facilities etc., that is, a height measuring device for sediment cake and a height measurement method for sediment cake There is.

  Although the embodiments and examples of the present invention have been described in detail as described above, it is apparent to those skilled in the art that many modifications can be made without departing substantially from the novel matters and effects of the present invention. It will be easy to understand. Accordingly, all such modifications are intended to be included within the scope of the present invention.

  For example, in the specification or the drawings, the terms described together with the broader or synonymous different terms at least once can be replaced with the different terms anywhere in the specification or the drawings. Further, the configuration and operation of the deposit cake height measuring device, the caliper and the abutting portion are not limited to those described in the embodiments and examples of the present invention, and various modifications can be made.

1 to N measuring positions 11 (end 12), 12 bars, 13 verniers, 14 depth bars, 15 tips (of depth bars 14), 16 sliding strokes, 17 calipers, 18 fixing screws, 19, 20 Abutment part, 21 and 22 two sides sandwiching right angle of right triangle, 22 and 24 (of length X and R) side, 25 (at abut part 19) tip, 31 deposit cake, 32 (deposit cake 31 ) Bottom side, 34 (top of deposit cake 31), 40 filtration tank (solid-liquid separation device), 41 filtration recess, 42 measuring table, 43 (depicted on measuring table 42 or base paper 45) circle or circumference , 100,101 deposit cake height measuring instrument, H (for deposit cake 31) height, O (for deposit cake 31 or circle 43) center, R (for deposit cake 31 or circle 43) radius, S10 Deposit cake moving process, S20 depth bar bump Exit process, S30 depth bar positioning process, S40 main descent process, S50 top contact process, S60 height reading process, X (length of contact portion 20), XY (including bottom surface 32 of deposit cake 31) surface , Z Measured distance (the distance that the depth bar 14 protrudes from the reference position 11 of the scale 12)

Claims (7)

A deposit cake height measuring instrument for measuring the height of a deposit cake having irregularities on a cylindrical surface,
A main scale capable of displaying a distance away from the end portion as a reference position;
A vernier slidably supported in the longitudinal direction of the scale;
A depth bar which is integrally slidable with the vernier and which allows direct reading of the distance projected from the end of the bar;
An abutment portion extending a predetermined length from the end at a right angle to the longitudinal direction of the main scale;
The distance measured by bringing the contact portion into contact with the top of the deposit cake while aligning the tip of the depth bar with the surface in a state where the surface including the bottom surface of the deposit cake and the depth bar are orthogonal to each other and lees cake height of the cylindrical,
A deposit cake height measuring device , wherein the predetermined length of the contact portion is a length corresponding to a radius of the deposit cake.   The caliper comprising: the main scale, the sub scale, and the depth bar; and an abutment portion extending from the end portion by the predetermined length at right angles to the longitudinal direction of the main scale. The deposit cake height measuring device according to 1. 3. The apparatus according to claim 1, wherein a plurality of types of the contact portions, which are different in at least the predetermined length, adapted to the radius of the deposit cake having different sizes, are exchangeable with the main scale. Deposit cake height measuring device. The contact portion is a right triangle, and one side of the two sides of the right triangle is aligned in the length direction of the main scale, and the other side extends from the end by the predetermined length. The sediment cake height measuring device according to any one of claims 1 to 3 , wherein the sediment cake does not interfere with the sliding stroke of the vernier supported on the main scale. 5. The deposit according to any one of claims 1 to 4 , wherein the contact portion is made of a resin that develops a surface color of a complementary color relationship defined by a color wheel with respect to the surface color of the precipitate cake to be measured. Cake height measuring device. A method for measuring the height of a cake of sediment, which is performed to process and manage a cylindrical cake of cake which is a residue after filtration.
A deposit cake moving step of moving and placing the deposit cake on a horizontal measurement table;
A depth bar projecting step in which a depth bar extended on a slideable vernier with respect to a vernier constituting a vernier caliper is projected from an end of the vernier sufficiently longer than the height of the deposit cake to prepare for measurement. When,
The tip of the depth bar is set to one point where the unmeasured part is selected from among the measurement positions dispersed by dividing the circumference defined to surround the bottom surface of the deposit cake placed on the measurement table by N. Depth bar positioning step to abut;
The tip of the contact portion extended by a predetermined length at a right angle to the length direction of the main length, with the depth bar held vertically, with the tip of the contact portion directed to the center of the upper surface of the cake. A main scale lowering step of sliding the main scale in a lowering direction;
A top contact step of bringing the contact portion into contact with the top of the deposit cake;
In the top portion contact step, the distance by which the depth bar protrudes from the end of the main scale is represented by a value displayed based on the relative positional relationship between the main scale and the sub-scale. Reading height as height, and
The sediment cake height measuring method which repeatedly performs a total of N times from the depth bar projecting step to the height reading step after the height reading step. The sediment cake height measuring method according to claim 6 , wherein the division number N of the circumference defined on the measurement table is eight, and the measurement positions are scattered over eight places.