JP2015196573A - Chemical addition device for hydrous loose object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chemical addition device for hydrous loose object, for solving a landing difficulty on a belt conveyor due to slurry-state sump water which is inevitably generated when landing a hydrous loose object.SOLUTION: A chemical addition device for hydrous loose object comprises: addition means for adding a chemical; addition amount control means for controlling an addition amount of the chemical; a sensor for collecting information for determining start and stop of chemical addition; a chemical tank for storing chemical to be added; and a pipe for transporting the chemical from the chemical tank to the addition means.

Description

  The present invention provides a method for unloading water-containing ores and coal-containing water-containing materials from a transport ship, barge, etc. by a bucket crane, unloader or continuous unloader (or simply unloader) bucket. The present invention relates to an apparatus for adding a chemical solution to a water-containing bulk material, which has been developed in order to solve a problem of unloading on a belt conveyor caused by the generation of water.

  Most of roses such as ore and coal are imported from abroad, and most of them are transported by ship. In recent years, many of these roses, especially ores and coal, have a high moisture content, and the moisture is separated from the roses during the transportation process and is accumulated at the bottom of the hold. As a result, in the middle or the latter half of the unloading process by the unloader, a dent is formed after grabbing by the grab bucket for unloading, and the powder and moisture are turbid and accumulate as suspended spring water (see Fig. 1). ), And eventually became a slurry and caused a problem of unloading. This problem also occurs in the unloading process using a bucket such as a continuous unloader including a bucket conveyor. In FIG. 1, 1 is a hold, 2 is a water-containing rose, 3 is a suspended spring, 4 is a depression, 5 is an unloader, and 6 is a grab bucket.

Moreover, when heavy rain or the like occurs during unloading from a ship, the rose becomes high in moisture regardless of whether the unloading is continued or not, and a similar unloading phenomenon occurs.
This is the same in countries with rainy seasons.If there is no roof covering the bridge crane and unloader including the ship, the roses being unloaded will become highly moist and will eventually become a slurry as unloading continues. There was a problem of leading to unloading problems.

  In order to solve such a problem, the methods disclosed in Patent Documents 1 and 2 conventionally, that is, when spring water is generated, the spring water is once pumped by a drainage facility (suction machine). After that, methods such as resuming unloading have been proposed.

JP 60-204526 A Japanese Utility Model Publication No. 50-13339 Japanese Patent Laid-Open No. 61-60784 JP 61-164658 A

  However, in the pumping and draining methods proposed in Patent Documents 1 and 2, in order to pump spring water, the ship is moved to a place where drainage (pumping) facilities are provided each time, or drainage (pumping) is performed. It was necessary to move the equipment itself and pump it out of the hold, and there was a problem that the work time was long.

  In particular, the spring water is generated in the dent generated after grabbing by the grab bucket in the middle of unloading, so the above-mentioned pumping and draining method requires frequent repeated pumping work of the spring water. There was a problem that the work efficiency was greatly reduced by repeating the interruption and restart.

In particular, in recent years, ore and coal have become inferior, for example, those having a high water content, and such problems have become more apparent.
In addition, if the ore and coal to be unloaded have a high moisture content, the loose material tends to flow before the occurrence of spring water, which will hinder the transportation by the belt conveyor during unloading, and will cause trouble in transportation. In addition to this, there were many problems in the maintenance of belt conveyor equipment.

  Furthermore, although the prior art proposed in Patent Documents 1 and 2 assumes that only spring water is pumped, the hollow portion generated after grabbing with a grab bucket is separated from a rose having a large particle size. In many cases, powder with a small particle size flows in and most of the powder is mud (slurry). When pumping such a slurry liquid, it is difficult to pump with conventional drainage equipment, and every time spring water is generated, the work efficiency is further reduced. In addition, since the unloaded bulk is rich in fluidity, it easily flows out of the belt conveyor, which also causes unloading troubles.

  With respect to these problems, the inventors paid attention to the water content reduction methods proposed in Patent Documents 3 and 4 and repeated studies. However, in the methods described in the above-mentioned Patent Documents 3 and 4, since the solid water-absorbing resin is used, it is difficult to uniformly contact the roses at the time of unloading. It has been found that there is a problem that it easily falls from the belt conveyor because it swells. Moreover, since it is necessary to finally separate the water-absorbing resin from the rose, it has been industrially difficult to use the water-absorbing resin when unloading the water-containing rose.

  The present invention has been developed in view of the above-described present situation, and to a hydrous rose for solving a problem of unloading on a belt conveyor due to slurry-like spring water inevitably generated when unloading a hydrous rose. It aims at proposing the chemical | medical solution addition apparatus of.

That is, the gist configuration of the present invention is as follows.
1. A hydrous rose containing ore and coal is unloaded from a cargo ship onto a belt conveyor using a grab bucket of a bridge crane or an unloader, and when the hydrous rose is conveyed to the yard by the belt conveyor, A device for adding a chemical to a water-containing rose,
Addition means for adding a chemical solution, addition amount control means for controlling the addition amount of the chemical solution, a sensor for collecting information for determining the start and stop of the addition of the chemical solution, a chemical solution tank for storing the chemical solution to be added, and the chemical solution An apparatus for adding a chemical solution to a hydrated rose, comprising a conveyance hose for conveying a chemical solution from a tank to the addition means.

2. 2. The chemical solution adding apparatus for adding water to a hydrated rose according to 1, wherein the adding means has a straight type nozzle or a three-pronged nozzle type.

3. 3. The chemical solution adding device to the water-containing bulk material according to 1 or 2, wherein the addition amount control means includes a pump.

4). 4. The apparatus for adding a chemical solution to a hydrous rose according to 3, wherein the addition amount control means further comprises a distance adjustment means between a valve and a nozzle.

5. The chemical | medical solution addition apparatus to the water-containing rose of any one of said 1-4 whose said sensor has a battledore switch and a limit switch.

  According to the present invention, in a cargo ship hold, in the middle of loading, suspended spring water in which powder is suspended is generated and contained in roses, and the moisture content of roses is increased. Even if it exists, it becomes possible to convey roses and contained water derived from spring water without overflowing from the belt conveyor, and there is no need to pump up suspended spring water. Therefore, it is not necessary to interrupt the unloading work as in the prior art, and the continuous unloading work can be performed, so that the unloading efficiency is improved.

It is explanatory drawing which shows a mode that the loose thing in a cargo ship is unloaded using the grab bucket of an unloader. It is a figure which shows a mode that the hydrated rose thing containing an ore and coal is unloaded from a cargo ship, and also a hydrated rose thing is conveyed to the yard which is the storage place with a belt conveyor. (a) And (b) is a figure which shows the addition means which adds the chemical | medical solution in this invention. It is a figure which shows the addition amount control means which controls the addition amount of the chemical | medical solution in this invention. It is a figure which shows four patterns which the apparatus of this invention performs. It is a figure which shows the sensor which has a battledore switch and a limit switch. It is a figure which shows the control flow of the apparatus of this invention. (a)-(e) is a conceptual diagram explaining the effect | action when a polymer flocculant is added to suspension spring water. It is a figure which shows the conveyance route by the belt conveyor after an ore exclusive ship and unloading.

Hereinafter, the present invention will be specifically described with reference to the drawings.
As shown in FIG. 2, the apparatus of the present invention converts a wet rose (or simply “rose”) containing ore or coal (or simply “ore”) into a bridge crane or unloader. The grab bucket is used to unload the cargo from the cargo ship onto the hopper in the unloader machine or directly onto the belt conveyor, and to store the wet roses on the belt conveyor (or “BC”). It is a device that adds chemicals when transported to the yard.

  The apparatus stores an addition means for adding a chemical solution, an addition amount control means for controlling the addition amount of the chemical solution, a sensor for collecting information for determining the start and stop of the addition of the chemical solution, and a chemical solution to be added. It is characterized by comprising a chemical tank and a transport hose that transports the chemical from the chemical tank to the adding means.

[Adding means for adding chemicals]
As shown in FIGS. 3 (a) and 3 (b), the adding means for adding a chemical solution in the present invention comprises a joint portion with a transport hose, piping, and a nozzle portion for spraying liquid. In particular, it is used when spraying a liquid, and is not particularly limited as long as it can add a predetermined amount of a chemical solution when transporting the hydrated rose to the yard, but is not limited thereto. Most preferably, the straight type nozzle shown in a) or the trifurcated nozzle type shown in FIG.

  Moreover, although the installation place of the said addition means is one place chosen from a BC junction part, BC, the hopper in an unloader machine, and the cut-out part from a hopper, it can also install in multiple places.

[Addition amount control means for controlling the addition amount of the chemical solution]
In the present invention, as the addition amount control means for controlling the addition amount of the chemical solution, as shown in FIG. 4, it is preferable to include a nozzle distance adjusting means, a valve, and a liquid feed pump.
The addition amount control for controlling the addition amount of the chemical solution according to the present invention can be performed by adjusting the opening degree using a valve. In addition, by adjusting the amount of chemical liquid discharged from the pump, changing the nozzle tip opening, changing the number of nozzles, adjusting the distance between the ores and the nozzle, etc. The amount of the chemical added to the ore can be controlled.

  Here, the addition amount of the chemical solution can be obtained by appropriately conducting experiments according to the properties of the ore, but when the ore transport amount is about 500 to 2000 ton / h, the addition amount of the chemical solution is 50 to 600 kg / It is desirable to be about h.

The above-described valve is not particularly limited as long as it is generally used for a chemical solution transport path. Further, as the nozzle distance adjusting means, it is possible to adopt a mechanism for moving up and down the adding means for adding the chemical solution, a mechanism for expanding and contracting the pipe between the joint portion with the transport hose and the nozzle portion.
Here, the pump, the valve, and the nozzle distance adjusting means are not indispensable constituent elements, and any one can be selected and used, and may not be used depending on the amount of the chemical solution added.

  In addition, as shown in FIG. 4, the present invention includes a chemical tank that stores the chemical to be added and a transport hose that transports the chemical from the chemical tank to the adding means. If the amount of the chemical solution can be stored and transported, the material of the structural material is not limited, and the capacity of the chemical solution tank and the diameter of the transport hose can be appropriately selected according to the size of the equipment and the transport amount of the bulk material.

[Sensor that collects information for judging the start and stop of chemical addition]
An apparatus according to the present invention needs to implement the four patterns shown in FIG.
In the figure, I is a pattern to which a chemical solution should be added, and is a state in which the chemical solution addition BC is in operation and there is a load on the BC (see the schematic picture in the figure).
II is a pattern in which the addition of the chemical solution should be stopped, in which the chemical solution addition BC is in operation and there is no load on the BC (see the abbreviated picture in the figure).
III is a pattern in which the addition of the chemical solution should be stopped, in which the chemical solution addition BC is stopped and there is a load on the BC (refer to the schematic diagram in the figure).
IV is a pattern in which the addition of the chemical solution should be stopped, in which the chemical solution addition BC is stopped and there is no load on the BC (see the schematic drawing in the figure).

  In order to reliably perform the above-mentioned four patterns, in the present invention, in order to confirm that the BC motor is operating and that the spring water ore is flowing, the start and stop of the chemical addition are performed. Although it is necessary to have a sensor that collects information for determination, this sensor preferably has a battledore switch and a limit switch. This is because it can be accurately detected that there is a load on the BC as shown in FIG. In addition, the fact that the BC motor is in operation can be obtained either directly from the motor or from the electric room as an electrical signal for the operation / non-operation of the BC motor.

When an adding means for adding a chemical solution is installed on the BC, it is important that this sensor is installed on a BC before the installed BC.
Moreover, when the addition means which adds a chemical | medical solution is installed in the cutting part from a hopper or a hopper, it becomes a sensor which confirms that the unloader etc. are moving.

  Note that the operator can determine whether ores on BC have spring water, but the operator can also make a visual check. It is also possible to automatically judge by performing image analysis and analysis by automatically collecting the raw material on BC.

Next, the chemical solution addition procedure using the above apparatus will be described.
In general, as shown in FIG. 1, an ore called a loose article 2 accommodated in a cargo hold (loading room) 1 is used as a bridge crane, an unloader 5, or a bucket of a continuous unloader. When unloading using water, a puddle of spring water is generated in the lower layer of the ore deposit. Then, when the unloading operation proceeds and the unloading operation reaches from the middle layer to the lower layer portion of the ore deposit layer, a depression 4 is generated in a part of the hydrous rose deposit layer. It is known that suspended springs 3 in which powders separated mainly from gravel-like ores are dispersed and suspended are accumulated in the depressions 4.

  The suspended spring water 3 generated in the sediment layer of the water-containing bulk material 2 in the hold 1 is gradually slurried as it is unloaded and becomes difficult to unload in the grab bucket 6 of the unloader 5 or the like. This is because once slurried material can be grabbed by the grab bucket 6, it will flow out of the hopper (not shown) and belt conveyor (not shown) in the unloader machine, and the unloader operation will continue. Because it becomes impossible. In particular, at the bottom of the hold 1, suspended spring water is often slurried, and unloading work is often interrupted and drainage work must be performed.

  Therefore, in the present invention, when the moisture content of the roses is high and the cargo handling efficiency deteriorates, the roses are loaded in the hopper in the unloader machine (including the continuous unloader machine) or unloaded on the belt conveyor. By adding a polymer flocculant to a loose product to cause particle aggregation and agglomeration and granulating it, that is, making it agglomerated, it is possible to transport spring water together with the rose, and unloading work To prevent unloading and improve unloading efficiency. In addition, although one place selected from a BC junction part, BC, the hopper in an unloader machine, and the cut-out part from a hopper is preferable, multiple places may be sufficient.

  By using the apparatus according to the present invention, the suspension spring 3 together with the water-containing roses 2 such as ores and the like, more precisely, the components of the suspension spring 3 are made into a solid state (aggregate), and the belt conveyor This makes it possible to carry by

  As shown in FIG. 7, it is important that the specific control flow is determined with priority given to whether the BC is operating or not. This is because when the chemical solution is added while the BC is not in operation, the chemical solution is highly viscous and is stored under the BC to cause equipment trouble. In addition, even if the BC is in operation, if the chemical solution is added while there is no load on the BC, there is a risk that the rubber of the BC will deteriorate. In this case, the chemical solution will accumulate under the BC and cause equipment troubles. Because it becomes the original.

[Principle that can be transported]
FIGS. 8A and 8B show water: Wm contained in a suspended spring containing powder: P, and a polymer flocculant: A added thereto. When A is added to P + Wm, as shown in FIG. 8 (c), a part of Wm and P is trapped by the polymer flocculant: A polymer B spreading in the form of molecular chain branches in A. In this way, the particles are condensed to form some of the condensed particles 7 having a small particle diameter as shown in FIG. Thereafter, together with mixing (including drop mixing at the junction site), a plurality of the aggregated particles 7 eventually aggregate (aggregate) into aggregated particles 8 having a large particle size as shown in FIG. 8 (e). grow up. Accordingly, the aggregates of the water-containing bulk material in the present invention are those in which the above-mentioned aggregated particles and aggregated particles are configured in an arbitrary ratio (any may be 100%). In addition, unless otherwise indicated, the% display in this invention means mass%.

At the stage shown in FIG. 8 (e), Wm is in a solidified state, and is in an attached state where it adheres to loose objects. In such a state, the bulk material can be easily transported on the belt conveyor, and the suspended spring itself can be transported together with the bulk material without overflowing from the belt conveyor. It will be possible to send the roses to such as without trouble.
In addition, since the components constituting the chemical solution in the present invention are burned during firing in the sintering machine of the next step, such as N, C, and H, and do not remain in the product, it is not necessary to separate the chemical solution. Therefore, this invention has the merit that the process of chemical | medical solution separation is unnecessary.

  In addition, as described above, when overflow of water or loose objects occurs, the adhered water generated on the back of the belt conveyor or adhered powder causes troubles in conveying loose objects, etc., as well as the conveyor roll and drive system, Although troubles due to adhering water and adhering powder occur, in the present invention, water and loose articles do not overflow from the belt conveyor. This problem can be effectively prevented.

(Polymer flocculant)
In this invention, the chemical | medical agent which has a polymer flocculent as a main component is used as a chemical | medical solution. Alternatively, if the drug is solid, it is dispersed in a solution and used as a drug solution.
In addition, the polymer flocculant is an agent that causes adsorption activity on the powder by the electrostatic force or hydrogen bond of the polymer and causes a cross-linking action between the powders. Any material can be used as long as it has an effect of forming an aggregate. For example, powders, granular or liquid organic flocculants such as polyacrylamide (copolymerized allylamide and sodium acrylate), polyvinylamidine flocculants, amphoteric polymer flocculants, etc. Therefore, it is preferable because it exhibits an aggregating action. In addition, it is good also as mixing together and using a well-known inorganic type coagulant | flocculant.
Furthermore, acrylic acid cationic polymer, acrylamide-based cationic polymer, methacrylic acid-based polymer, methacrylic acid amino ester cationic polymer, amidine polymer, anionic W / O emulsion polymer, and the like can also be used as the polymer flocculant.

In the present invention, the main component of the polymer flocculant generally refers to a drug containing a polymer flocculant in an amount that is recognized as having an aggregating effect. It is a drug with a content of about% or more. Of course, the polymer flocculant: 100% may be used as a drug as it is.
In addition, when the drug is solid or liquid and is used in a thin state, the solution includes water and an organic solvent, the solute is a polymer of C, H, N, and O, and the solvent is a hydrocarbon type. A solvent (only C, H, O) is mentioned.

Furthermore, it is preferable that the addition amount of the chemical | medical solution in this invention is contained about 0.1 to 1% with respect to the moisture content of a rose.
This is because, when the above range is satisfied, it was confirmed from the test results described later, however, the fluidity due to excessive moisture is reduced and the adhesiveness when the coagulant is excessively administered is not expressed. is there.
In addition, it is more preferable that the said addition amount is contained about 0.15-0.4% with respect to the moisture content of a rose. Moreover, in this invention, the addition ratio (amount) of a chemical | medical solution is a ratio with respect to the moisture content of a rose as above-mentioned.
Here, the addition rate of the chemical solution is not particularly limited, and may be set as appropriate depending on equipment or the like, but an example is about 2 to 10 (L / min).

  As described above, the present invention has been described by taking Carajas iron ore as an example. However, as long as the conditions of the present invention are followed, other ores may be used, and in the case of a new iron ore, the test object described in Experiment 1 or 2 above is used. By implementing as a new iron ore, the target value of the moisture content can be determined. In addition, in order to avoid overflowing the contained water derived from spring water from the belt conveyor as much as possible, if you take safety, if you start adding chemicals to roses from unloading at a time when the moisture content reaches 9.6% or more Good. In addition, the moisture content (amount) in this invention is a ratio of the moisture content with respect to the mass of a rose thing.

[Example 1]
The following experiment was conducted using the second belt conveyor in FIG. 9 as the chemical addition position.
When unloading Carajas iron ore with a water content of 7.9 to 23% from a transport ship by unloading iron ore, chemicals were added under the conditions shown in Table 1.

Here, the chemical solution was Chrysat C-333L and hybrid polymer α. Chrysat C-333L and hybrid polymer α are both liquids.
The effect of addition was determined by photographing the return side of the belt conveyor and the junction at the end of the belt conveyor after the unloading was completed.
Furthermore, the second belt conveyor is stopped (FIG. 5: Pattern III), the first belt conveyor is stopped (FIG. 5: Pattern II), and after the first belt conveyor is stopped, the carajas iron ore on the second belt conveyor is After running out, the second belt conveyor was stopped together (FIG. 5: Pattern IV).

As a result of the determination, except for a slight amount of deposits generated at the positions a and b in FIG. 9, after the c position (the junction on the return side and the belt conveyor end position after the third belt conveyor). It was found that Carajas iron ore can be unloaded without deposits. The unloading efficiency was about 90%.
Furthermore, the second belt conveyor is stopped, the first belt conveyor is stopped, the first belt conveyor is stopped, and then the second belt conveyor is stopped together after the carajas iron ore on the second belt conveyor disappears. In all the patterns, the addition of the chemical solution was stopped, and the chemical solution did not accumulate on both BC and BC.

[Example 2]
The following experiment was carried out using the belt conveyor on the downstream side of the hopper (not shown) of the first belt conveyor in FIG. 9 as the chemical addition position.
The addition conditions were the same as in Example 1, and the chemical solution was also the same component. The addition effect was also determined in the same manner as in Example 1.
Further, the first belt conveyor is stopped (FIG. 5: Pattern III), the discharge from the hopper is stopped (FIG. 5: Pattern II), and after the discharge from the hopper is stopped, the carajas iron ore on the first belt conveyor is After running out, the first belt conveyor was stopped together (FIG. 5: Pattern IV).

As a result of the determination, there is a slight amount of adhering matter generated at the position a in FIG. 9, and the adhering matter is present at the position b and after (junction portion at the return side and the end of the belt conveyor after the second belt conveyor). It has been found that Carajas iron ore can be unloaded without any occurrence.
Further, the first belt conveyor is stopped, the discharge from the hopper is stopped, the discharge from the hopper is stopped, and the first belt conveyor is stopped together after the carajas iron ore on the first belt conveyor is exhausted. In all the patterns, the addition of the chemical solution was stopped, and the chemical solution did not accumulate on both BC and BC.

Further, in the conventional transport of the Carajas iron ore, as described above, the Carajas iron ore itself contains a large amount of moisture, and a lot of spring water is generated when it is unloaded to the land. Therefore, the iron ore was unloaded while intermittently removing (draining) suspended spring water.
Here, when the unloading efficiency of iron ore when no spring water is generated is 100%, the unloading efficiency is lowered to 65% in the conventional unloading method in which drainage work is performed. However, in each of the above-described embodiments, it was possible to achieve the unloading efficiency of about 92% by adopting the unloading method suitable for the present invention.

Example 3
The effect of the present invention can be obtained also in the case of unloading of iron ore that continues to be unloaded by heavy loader during heavy rain and becomes excessive in water.
The experimental procedure is to continue unloading with an unloader grab bucket even during heavy rain, and proceed with the unloading work. When unloading from the transport ship, the chemical solution adding apparatus according to the present invention was added to the second belt conveyor in FIG. 9 to add the chemical solution to the acrylamide polymer flocculant.

  In this case, assuming that the discharge efficiency of iron ore when there is no spring water due to heavy rain is 100%, the conventional discharge method that performs drainage work will reduce the discharge efficiency to 65% after the occurrence of spring water. did. However, by adopting the unloading method suitable for the present invention, it was possible to maintain the unloading efficiency of about 90% even after the occurrence of spring water due to heavy rain.

  The chemical solution adding device to the hydrated rose according to the present invention can be applied to the unloading work of roses such as gravel, sand, and grains in addition to the exemplified hydrated ore and coal.

DESCRIPTION OF SYMBOLS 1 Funakura 2 Bulk material 3 Suspension spring 4 Dimple 5 Unloader 6 Grab bucket 7 Small coagulation particle 8 Large coagulation particle A Polymer coagulant B Polymer
P Powder Wm Water

Claims (5)

A hydrous rose containing ore and coal is unloaded from a cargo ship onto a belt conveyor using a grab bucket of a bridge crane or an unloader, and when the hydrous rose is conveyed to the yard by the belt conveyor, A device for adding a chemical to a water-containing rose,
Addition means for adding a chemical solution, addition amount control means for controlling the addition amount of the chemical solution, a sensor for collecting information for determining the start and stop of the addition of the chemical solution, a chemical solution tank for storing the chemical solution to be added, and the chemical solution An apparatus for adding a chemical solution to a hydrated rose, comprising a conveyance hose for conveying a chemical solution from a tank to the addition means.   The chemical | medical solution addition apparatus to the hydrated rose thing of Claim 1 with which the said addition means has a straight type nozzle or a three-pronged nozzle type.   The chemical | medical solution addition apparatus to the hydrated rose thing of Claim 1 or 2 with which the said addition amount control means has a pump.   The apparatus for adding a chemical solution to a hydrous rose according to claim 3, wherein the addition amount control means further comprises a distance adjustment means between a valve and a nozzle.   The chemical | medical solution addition apparatus to the water-containing rose of any one of Claims 1-4 in which the said sensor has a battledore switch and a limit switch.

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