JP6066129B2 - Unloading method of water-containing roses - Google Patents

Description

  In the present invention, when unloading ores and coal containing moisture are intermittently or continuously unloaded from a carrier ship or barge (艀) by a bridge crane, an unloader or a bucket of a continuous unloader, spring water is generated. The present invention relates to a method for unloading hydrous roses that has been developed in order to eliminate unloading troubles caused by the operation.

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 an unloader, etc., a hollow is formed after grabbing with a grab bucket for unloading, etc., and suspended spring water in which powder particles and spring water are turbid In addition to generating and accumulating, there is a problem that it eventually becomes a slurry and becomes an obstacle to unloading. This problem also occurs in the unloading process using a bucket of a continuous unloader composed of a bucket conveyor or the like.
In addition, when heavy rains occur during unloading from a ship, the same unloading phenomenon also occurs in that roses become highly moist and rainwater accumulates at the bottom of the hold regardless of whether or not the unloading is continued. Will result.
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 deal with such problems, conventionally, the methods disclosed in Patent Documents 1 and 2, that is, when spring water is generated, the spring water is once pumped through a drainage facility (suction machine), and thereafter A method of resuming unloading has been proposed.

JP 60-204526 A Japanese Utility Model Publication No. 50-13339

However, the pumping and draining methods proposed in Patent Documents 1 and 2 are used to move the ship to a place with drainage (pumping) facilities in order to pump the spring water, or drainage (pumping). ) Since the facilities themselves are arranged between the holds and the spring water is pumped up from each hold, there is a problem that the drainage takes time in addition to the increase in equipment costs.
In particular, since the spring water appears in the depressions that occur after grabbing a rose with a grab bucket in the middle of unloading or after excavating a rose with a bucket of a continuous unloader, When it is repeated frequently, there has been a problem that the work efficiency is greatly reduced due to the suspension and resumption of the unloading work. In particular, in recent years, ore and coal have become inferior, for example, those with high moisture content, and such problems have become more apparent.

  Furthermore, although the prior art proposed in Patent Documents 1 and 2 assumes that only spring water is pumped, a depression that occurs after grabbing a rose with a grab bucket or after excavating a rose with a bucket In many cases, powder particles with a small particle size separated from bulk material with a large particle size flow into the part and become muddy (slurry). In this case, it is difficult to pump with conventional pumps, and it is unloaded. It was a decisive obstacle to work.

  Accordingly, an object of the present invention is to propose an effective treatment method for spring water and suspension spring that are inevitably generated when a wet rose is unloaded.

As a solution that can overcome the above-mentioned problems of the prior art and is effective in achieving the above-mentioned object, the present invention can be used to remove a wet bulk material such as ore or coal from a cargo ship, a bridge crane, When unloading grab buckets or continuous unloader buckets for unloading intermittently or continuously, when suspended springs with powder particles suspended in the spring water are generated during the unloading operation. In addition, a polymer flocculant and a water adsorbent are added to the position where the suspended spring is generated, and by adding the polymer flocculant, aggregated particles and aggregated particles are generated. On the other hand, aggregated particles and aggregated particles are generated. were allowed to adsorb moisture adsorbents for at least spring water of the suspension springs part no, proposes a unloading process, the hydrous rose product and performing unloading with rose thereof.

In the unloading method according to the present invention,
( 1 ) Use of a polymer water-absorbing agent as the moisture adsorbent,
( 2 ) The moisture adsorbent is added in an amount equivalent to more than 0.5 to 3.3 mass% of the suspended spring water amount,
( 3 ) The moisture adsorbent is added in an amount equivalent to 1.0 to 2.0 mass% of the suspended spring water amount,
Is preferred.
In addition,
( 4 ) The polymer flocculant is added in an amount equivalent to 0.4 to 1.0 mass% of the amount of suspended spring water,
(5) The addition of the moisture adsorbent to the occurrence position of the suspension springs, Rutotomoni subtracting at least spring water of the suspension Spring water, by the addition of the polymeric flocculant, to produce coagulated particles, agglomerated particles It is unloading from,
( 6 ) The fine ore ratio (-) represented by the ratio of the weight of the roses and the suspended spring water is 7 or more,
However, it is considered that a more preferable solution can be provided.

By adopting the method of the present invention having the above-described configuration, even when suspended spring water is generated during unloading in the cargo ship hold, by adding a polymer flocculant and a water adsorbent, resulted in coagulation and aggregation of the water and the powder particles, the adsorbed spring water in the moisture adsorbent (water-water retention) even without low, solid (spring water, polymer flocculant, water absorbent, powder Since the particles are unloaded together with other roses, there is no need to carry out only the suspension spring pumping operation.
For this reason, since the unloading operation can be performed continuously without interrupting the unloading operation as in the prior art, the unloading operation efficiency is remarkably improved.

  By the way, when a polymer flocculant and a water adsorbent are used together, the upper limit of the moisture content of roses can be increased by adsorbing water in a range that cannot be taken up by the polymer flocculant to the water adsorbent. The cost can be reduced as compared with the case where only the agent is used, and there is an advantage that the influence on the next process and the conveying line can be reduced as compared with the case where only the moisture adsorbent is used.

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 explanatory drawing which shows a mode that the loose thing in a cargo ship is unloaded using the bucket of a continuous type unloader. It is a conceptual diagram explaining an effect | action when a polymer flocculant or a water | moisture-content adsorption agent is added to suspension spring water. It is a conceptual diagram explaining the effect | action when both a polymer flocculant and a water | moisture-content adsorption agent are added to suspension spring water. It is a basic diagram of an experimental container. It is explanatory drawing of the unloading method using the grab bucket of an unloader according to this invention method. It is a figure which shows the name of the part inserted in the hold of a continuous type unloader. It is explanatory drawing of the unloading method using the bucket of the continuous type unloader according to this invention method. FIG. 2 is an illustration of a preferred unloading method using a continuous unloader bucket according to the method of the present invention. It is explanatory drawing of the other suitable method of this invention using the grab bucket of an unloader.

Embodiments of the present invention will be described below with reference to the drawings.
In the place shown in FIG. 1, an ore or coal (hereinafter also referred to as “ores”) called roses 2 contained in a cargo hold (loading room) 1 of a cargo ship is replaced with a bridge crane or an unloader grab bucket. When unloading by using, generally, a puddle 3 made of spring water is generated in the lower layer portion of the ore deposit layer. When the unloading operation of the rose object 2 proceeds and reaches the middle layer to the lower layer part, a depression 4 is formed in a part of the rose accumulation layer after grabbing by the grab bucket, and the mainly gravel-like ore in the depression 4 It is known that suspended spring water Wm in a state where the powder particles separated from the powder are dispersed and suspended is accumulated.

When the suspended spring water Wm is generated in the bulk sediment layer in the hold, unloading proceeds and the slurry gradually becomes slurried, and unloading with the grab bucket 5 of the unloader becomes difficult. Moreover, even if the slurry is once grasped by the grab bucket 5, it will flow out at the hopper or belt conveyor portion not shown in the unloader machine, and the unloader operation cannot be continued. In particular, the bottom of the hold 1 often has such a state, and it is often necessary to interrupt the unloading work to pump up the spring water. This problem is the same when unloading using a continuous unloader bucket, which has been used in recent years, instead of unloading using a grab bucket.
As shown in FIGS. 2 and 7, in the continuous unloader, a vertical support beam portion is inserted into the hold 1, and unloading is performed by continuous excavation by a large number of buckets 5. The bucket 5 is connected via a chain, and the length between the sprockets can be adjusted by the hydraulic cylinder mechanism to adjust the insertion length into the hold 1 and the scraping length. The drilling depth can be adjusted. Also, the bucket 5 is rotated counterclockwise in the drawing while adjusting the amount of excavation at the drive link portion by driving by a separate driving device, and the material surface is excavated by the bucket 5 for unloading with high work efficiency. Can be done. The excavated roses are unloaded by the bucket elevator.
In the lower layer portion of the rose deposit layer, a puddle 3 that is separated from the rose in the transportation process and collected at the bottom of the hold, or a puddle 3 that is accumulated with high moisture due to rainwater is generated. When the unloading operation by the continuous unloader proceeds and reaches the middle layer to the lower layer part, a hollow 4 is formed in a part of the bulk deposit layer after excavation by the bucket, and suspended suspended water in the hollow 4 is suspended. Wm is generated. As the unloading progresses, the slurry gradually becomes slurried, and unloading becomes difficult even by the bucket 5 of the continuous unloader.
That is, once slurried, even if it can be excavated by the bucket 5 in the same manner as the grab bucket, it will flow out at the hopper and belt conveyor in the continuous unloader machine, and even if it is a continuous unloader, its operation Cannot continue.

Therefore, in the present invention, when the suspension spring water Wm occurs, to suspension springs Wm of the recess 4, polymer flocculants and, adding a predetermined amount of moisture adsorbents such as polymeric water absorbent For example, the powder particles in the suspension spring (spring water + powder particles) are entangled with a polymer flocculant to condense and aggregate to form particles, and the suspended spring water Wm is adsorbed with water. The unloading work efficiency was improved by unloading with the roses while adsorbed (absorbed and retained) on the agent.
That is, according to the method of the present invention, it is possible to landing with roses was 2 ore, and the like, the moisture adsorbent that has adsorbed the granules and suspension NigoYumizu Wm which is condensed and aggregation at the same time.

  3A to 3C show a state in which the polymer flocculant A is added to the suspended spring water Wm containing the powder particles P. FIG. By this addition, as shown in FIG. 3 (b), the suspension spring water Wm is such that a part of the powder particle P is entangled with the polymer in which the molecular chain of the polymer flocculant A spreads in a branch shape. Aggregates and first forms some of the small, granular agglomerated particles 6. Next, as time passes (unloading progress), a plurality of the aggregated particles 6 eventually aggregate (aggregate) and grow into aggregated particles 7 having a large particle size as shown in FIG.

  At this stage, the suspended spring water Wm is in a solid state and can be easily grasped and scraped by the grab bucket 5 or the like, and the suspended spring water Wm itself is also unloaded with the roses. It will be.

  FIGS. 3D and 3E show a state in which the moisture adsorbent B is added to the suspended spring water Wm containing the powder particles P. FIG. Here, the water of the suspension spring Wm is granulated in a swollen form confined in the crosslinked structure of the moisture adsorbent B together with the powder particles P as shown in FIG.

  That is, the suspended spring water Wm is absorbed in the moisture adsorbent B and becomes a solid state (swelled state). Thereafter, the suspended spring water Wm can be easily grasped by the grab bucket 5. The suspended spring Wm itself can be unloaded with the roses 2. Similarly, the suspension spring Wm can be excavated together with the rose 2 even in the bucket of the continuous unloader.

In another embodiment of the present invention, a polymer flocculant and a water adsorbent are added to the suspended spring water Wm, and the gravel-like roses 2 in the vicinity of the dent 4 or other parts are removed from the grab bucket 5. In addition to using, it is desirable to further agitate if possible (an operation of repeating grabbing and lifting with a grab bucket and opening and dropping) in order to promote solidification and increase the efficiency of unloading work.
In the continuous unloader, a polymer flocculant and a water adsorbent are added to the suspended spring water Wm, and the gravel-like roses 2 in the vicinity of the depression 4 or other parts generated by the bucket excavation are bucketed. If possible, it is desirable to further agitate (preferably an operation of repeatedly switching the scraping direction by the bucket) in order to promote the solidification described above and improve the efficiency of the unloading operation.

As the water-soluble polymer flocculant used in the present invention, by adding this agent to the suspension spring water, an adsorption activity is generated in the powder by the electrostatic force and hydrogen bond of the polymer, The thing of forming a solidified structure by causing a crosslinking action to form a condensed particle can be used. For example, polyacrylamide-based (copolymerized acrylamide and sodium acrylate), polyvinylamidine-based, and amphoteric polymer-based flocculants that are powder, granular or liquid organic flocculants are not only coagulating. It is preferable because it exhibits an aggregating action. Of course, you may mix and use an inorganic type flocculant.
In addition, an acrylic acid cationic polymer, an acrylamide-based cationic polymer, a methacrylic acid-based polymer, a methacrylic acid aminoester cationic polymer, an amidine polymer, and the like can also be used.

In addition, as the water adsorbent, for example, a super absorbent polymer (abbreviated as SAP) can be used, it has a high water absorption rate, has high water absorption and high water retention, and has once absorbed water. A drug that hardly releases water even when a certain amount of force is applied from the outside, for example, a polymer water-absorbing agent such as polyacrylate (sodium, potassium) resin is suitable. This polymeric water-absorbing agent has physical properties that do not exhibit tackiness even when moisture is adsorbed in the molecular structure after moisture absorption. In this sense, inorganic silica gel, activated alumina, zeolite, etc. should also be used. Is more preferable. As this moisture adsorbent, powdery or granular materials are used.
The reason why powdered and granular materials are used as the moisture adsorbent is to increase the contact area with the spring water and increase the moisture absorption rate, avoiding fine powdered materials to prevent scattering during use, The particle size is 0.5 mm or more and less than 10 mm. More preferably, one of 1 mm or more and 5 mm or less is used.

  That is, when the particle size is less than 0.5 mm, scattering during use cannot be effectively prevented, while when the particle size is 10 mm or more, the contact surface area with the spring water becomes relatively small and the moisture absorption rate decreases. It tends to take a long time to absorb moisture, and a sufficient effect cannot be obtained in a short time. Therefore, it is more preferably 1 mm or more and 5 mm or less.

  By the way, when adding both the polymer flocculant into the suspension spring Wm and the polymer water-absorbing agent as the moisture adsorbent, as shown in FIGS. When added simultaneously, as shown in FIGS. 4D to 4F, the same effect is finally obtained regardless of whether the polymer flocculant is added first and the polymer water-absorbing agent is added later. Will be.

  That is, in the places shown in FIGS. 4A to 4C, the polymer flocculant and the polymer water-absorbing agent for coping with water that cannot be handled by the flocculant alone are simultaneously added and stirred, The entanglement of the powder particles and the water molecules with the polymer polymer is performed, and the polymer particles are adsorbed with the polymer water-absorbing agent such as excess water molecules. Finally, as shown in FIG. The particles and the swollen polymer water-absorbing agent are agglomerated.

4 (d) to (f), Chrysat C-333L (registered trademark of Kurita Kogyo Co., Ltd.) as an example of the polymer flocculant is first added to the suspended spring water Wm. The mixture was agitated to cause coagulation of the powder particles and water molecules, and then, Chrysat C-500L (registered trademark of Kurita Kogyo Co., Ltd.) as an example of the polymer water-absorbing agent was added and stirred.
As a result, as shown in FIG. 4 (f), a mass similar to that shown in FIG. 4 (c) in which the aggregated particles and the swollen polymer water-absorbing agent were integrated into a mass was obtained.

Next, an experiment conducted for confirming the effect of the present invention will be described.
This experiment was performed using an iron container C shown in FIG.
Brazilian Calajas iron ore with high moisture content is used as hydrous rose ore, and it is charged into the iron container C in a conical shape and deposited, water is added, and then the central part of the conical layer is grabbed and fried At the stage where a pit was created and a water pool (equivalent to suspended spring) was generated, a water-soluble polyacrylamide polymer flocculant was added.

  In this experiment, simply adding polyacrylamide polymer flocculant to Calajas iron ore produced an action of entanglement of powder particles and water molecules with a polymer, but it is still small and requires some kind of treatment. It has been found. Therefore, stirring was performed by stirring the water pool portion generated in the central depression portion by a scoop. This stirring operation is a simulation of repeated operations of grabbing and releasing with a grab bucket in an actual machine.

  The results of this experiment are shown in Table 1. As can be seen from the experimental results, the simple addition of a polymer flocculant and the like without stirring is less effective. On the other hand, when accompanied by agitation (30 to 80 sec), in particular, the fine ore ratio (−) indicating the ratio of the weight of the suspended spring water containing the polymer flocculant and the moisture adsorbent to the weight of the rose is 7 or more. To. At this time, when the polymer flocculant in an amount corresponding to 0.4 to 1.0 mass% was added to the suspended spring water, a better effect was obtained.

  It was also found that the addition effect was further improved by adding a polymer flocculant to the suspended spring water and then adding another rose carajas iron ore to the suspension.

  In Table 1, if the numerical value shown as the weight ratio, that is, the ratio of the weight of the roses contained in the suspended spring water is 7 or more, the aggregation / aggregation of the powder particles is sufficiently advanced and the aggregated particles are You can definitely get it. The aggregated particles are aggregates having a strength that can be grasped by, for example, a grab bucket.

Furthermore, another experiment conducted for confirming the effect of the present invention will be described.
In this experiment, brazilian calajas iron ore with a high water content was used as the hydrous rose ore using the iron container C shown in FIG. 5, and the water was added to the iron container C in a conical shape and deposited. Then, the central part of the conical sedimentary layer is grabbed and lifted, and a dent is made there with a scoop to generate a puddle (equivalent to a suspended spring), and the polymer water absorption in the puddle A granular (bead) sodium polyacrylic salt resin was added as an agent.

The results of this experiment are shown in Table 2. According to this, it has been found that simply adding a polymer water-absorbing agent makes the polymer water-absorbing agent after the addition and water absorption a dull form (lumps), which hinders handling. Here, the polymer water-absorbing agent refers to a drug that swells by taking in water several hundred times or more of its own weight.
For example, a polymer water-absorbing agent (water-absorbing polymer polymer) has a characteristic of swelling about 400 times in pure water. However, as in the present invention, it has been confirmed that about 200 times is the practical limit for suspended spring water in which powder particles and spring water are in a suspended state. In addition, when the swelling rate of the added polymer water-absorbing agent is small, the swollen body is likely to jump and is expected to scatter outside the conveyor when transported by a belt conveyor or the like, so that the swelling rate is 30 times or more. It is preferable to make it.

The amount of the water adsorbent (water-absorbing polymer) added to the suspended spring water Wm should be approximately 200 times in terms of the swelling rate. Addition amount exceeding 0.5 mass%. When the swelling ratio is 30 times or more, the amount of the moisture adsorbent added is within 3.3 mass%.
As shown in Table 2, if the swelling rate is within 100 times, the amount of water adsorbent added is 1.0 mass% or more, and if the swelling rate is within 50 times, the amount of water adsorbent added is 2.0 mass%. It can be said that the following is preferable.

  As described above, in this experiment, simply adding sodium polyacrylate resin granules to Carajas iron ore results in a lumpy shape (agglomeration), but it is weak as an adsorbing action of suspended spring water containing powder particles. Therefore, it was found that some further processing was necessary. Therefore, in this experiment, a stirring operation was performed in which the water pool portion formed in the central depression 4 portion was stirred with a scoop. This stirring operation simulates the stirring operation by the grab bucket in the actual machine, the repeated opening and dropping operation, or the operation of repeatedly switching the scraping direction by the bucket of the continuous unloader.

  The explanation will be given by taking Carajas iron ore, which is an iron ore, in which water and roses are separated in the import process and spring water accumulates at the bottom of the hold when it arrives in Japan.

  In unloading iron ore in the state shown in FIG. 6 (a), when unloading Carajas iron ore with a moisture value of 7.9 mass% to 24.7 mass% from the carrier, the acrylamide polymer flocculant is suspended. On the other hand, an amount such that the chemical concentration corresponding to 0.6 mass% was obtained was added. The amount of the polymer flocculant with respect to the amount of the suspended spring water Wm is generated after the suspended spring water Wm is grabbed by the grab bucket. Therefore, the amount of the polymer flocculant to be added is estimated from the grab bucket capacity. It was done by the method of determining. Similarly, the determination of the ratio of fine ore ratio: 7 or more, which is the ratio of the weight of the bulk material and the weight of the suspended spring, shown as the weight ratio, was also estimated from the grab bucket capacity.

Next, after adding a polymer flocculant to the suspended spring water Wm generated in the depression generated in the ore deposit in the hold, the roses (carajas iron ore) around the suspended spring water Wm About 10 times the suspension spring water Wm was added to the suspension spring water Wm, and stirred for 30 to 80 seconds using a grab bucket. That is, after the grabbing bucket 5 repeated the operations of grabbing the rose (polymer flocculant) and opening and dropping, the unloading operation was performed.
As a result, by adding a polymer flocculant to the suspension spring Wm and stirring, the action of entanglement of the powder particles and the spring water of the suspension spring Wm with the polymer polymer is promoted, and the particles condensed by the polymer are Larger lumps (aggregated particles) can be made and unloaded.

  In particular, a large amount of spring water has remained in the bottom of the ship, but the remaining spring water has been reduced by the above treatment. From the above results, in the conventional transport of the Carajas iron ore, the Carajas iron ore itself has a lot of water, so when unloading it to the land, a lot of spring water is generated. If the above-described unloading method conforming to the present invention is employed while performing the (drainage) operation, the unloading operation for drainage operation is 65% when the efficiency when no spring water is generated is 100%. An efficiency of about 92% could be achieved, although only an efficiency of% was achieved.

  When unloading the Carajas iron ore, which is an example of the rose 2 in the state shown in FIG. 6 (a), from the hold 1 of the carrier ship, instead of the polymer flocculant of Example 1, a polyacryl that is a polymer water-absorbing agent The amount corresponding to 1.0 to 2.0 mass% of the acid salt resin granules was added to the amount of suspended spring water.

  The amount of the polymer water-absorbing agent relative to the amount of the suspended spring is estimated from the capacity of the grab bucket 5 because the suspended spring Wm is generated in the depression 4 after being grabbed by the grab bucket. This was done by determining the amount of molecular absorbent. Similarly, the determination of the numerical value 7 or more indicating the ratio of the weight of the rose to the suspended spring water as the weight ratio was also estimated from the grab bucket capacity.

Next, after adding a polymer water-absorbing agent to the suspended spring water Wm generated in the four depressions generated in the ore deposit in the hold, rose 2 around the suspended spring water Wm (Carajas iron ore) ) Was put into the suspension spring water Wm and stirred using the grab bucket 5. That is, after each operation of grabbing and lifting roses with the grab bucket 5 was repeated, the lifting operation was repeated.
As a result, the action of adsorbing the powder and spring water molecules in the suspended spring water Wm to the polymer adsorbent is facilitated by adding the polymer water absorbent to the suspended spring water Wm and stirring, so that unloading is easy. became.
It should be noted that, only by repeated lifting and dropping, the polymer water-absorbing agent may gather together to form a large lump, and it is easy to clog with a hopper, and even if the polymer water-absorbing agent can be dispersed, the swollen body is likely to jump. Because there is a fear of falling from the belt conveyor during transportation, the ratio of the powdered ore weight to the weight of the polymer water-absorbing agent that absorbed suspended spring water is set to 7 or more. In addition, a swollen body (polymer water-absorbing agent) that absorbed the suspended spring water Wm was further dispersed.

Thus, conventionally, a large amount of water remained on the bottom of the ship, but the remaining spring water was reduced by the above treatment.
From the above results, in the transport of Carajas iron ore, the water content of Carajas iron ore itself is high, so there is much spring water when unloading to land, and conventionally, suspended spring water Wm is being removed (drained). If the above-described unloading method conforming to the present invention is adopted, the efficiency when there is no spring water is assumed to be 100%, and unloading by the conventional drainage method can only give an efficiency of 65%. None were able to achieve efficiencies of about 90%.

  The following is an example of iron ore that continues to be unloaded by a continuous unloader during heavy rain and becomes excessively watery.

During the heavy rain, unloading with the bucket of the continuous unloader as shown in Fig. 7 was continued, and the unloading work progressed, and spring water began to be observed due to high moisture due to heavy rain when reaching the lower layer part of the latter half of the unloading (Fig. 8 ( When the iron ore in the state shown in a) is unloaded from the carrier ship, the amount corresponding to 1.0 to 2.0 mass% of the polyacrylate resin granule, which is a polymer water-absorbing agent, with respect to the amount of suspended spring water Was added.
The amount of the polymeric water-absorbing agent relative to the amount of the suspended spring water Wm is estimated from the excavation amount based on the bucket capacity and the excavation depth because the suspended spring water Wm is generated in the depression after excavation with the bucket. This was done by determining the amount of polymer absorbent to be added. Similarly, the numerical value shown as a weight ratio described later was estimated from the excavation amount based on the bucket capacity and the excavation depth.

Next, after adding a polymer water-absorbing agent to the suspended spring water Wm generated in the hollow portion of the bulk material deposit in Funakura 1, scrape the bulk material around the suspended spring water using a bucket. The suspension was poured into the spring water and stirred using a bucket.
That is, after the stirring of the bulk material and the polymer absorbent was repeated by the stirring operation by the operation of repeatedly switching the scraping direction with the bucket of the continuous unloader, the unloading operation was continued. As a result, by adding a polymer water-absorbing agent to the suspended spring water Wm and stirring, the adsorption action of the powder particles and spring water molecules in the suspended spring water by the high water-absorbing agent is promoted, and unloading becomes easy. It was.
It should be noted that with only agitation that repeatedly switches the bucket scraping direction, the polymeric water-absorbing agent may gather together to form a large lump, which is easily clogged with a hopper, and even if the polymeric water-absorbing agent can be dispersed, the swollen body Because it is easy to jump and there is a fear of falling from the belt conveyor during transportation, by setting the ratio of the fine ore weight to the weight of the polymer water absorbent that absorbed the suspended spring water to 7 or more, The swelling body (polymer water-absorbing agent) that absorbed the suspended spring water Wm could be further dispersed in the rose.

  When spring water was observed during unloading, a large amount of water remained in the bottom of the ship, but the remaining water was also reduced by the above treatment. Based on the above results, conventionally, unloading during heavy rain was refrained. However, when the above-mentioned unloading method conforming to the present invention is adopted when unloading to land, an efficiency of about 85% is achieved even when unloading during heavy rain for a long time when the normal efficiency is 100%. I was able to.

  In the following, an explanation will be given by taking as an example coal that has continued to be unloaded by a continuous unloader during heavy rain and has become excessively watery.

During the heavy rain, the unloading with the continuous unrotor bucket as shown in Fig. 7 was continued, the unloading work progressed, and the spring water began to be observed due to the high moisture due to heavy rain when reaching the lower layer part of the latter half of the unloading, Fig. 9 When the coal in the state shown in (a) is unloaded from the carrier ship, similarly to the unloading of the iron ore of Examples 1, 2, and 3, the polyacrylate resin granule that is a polymer water-absorbing agent is suspended in the amount of suspended spring water. The amount corresponding to 1.0 to 2.0 mass% was added.
The amount of the polymer absorbent relative to the amount of suspended spring water Wm is estimated from the amount of excavation based on the bucket capacity and excavation depth, since suspended spring water is generated in the depression after excavating with the bucket. This was done by determining the amount of polymeric absorbent to be used. Similarly, the numerical value shown as the weight ratio was estimated from the excavation amount based on the bucket capacity and the excavation depth.

Next, after adding a polymeric water-absorbing agent to the suspended spring water Wm generated in the hollow portion of the bulk sediment layer in the hold, coal around the suspended spring water is suspended using a bucket. Squeezed into the spring water and stirred using a bucket. That is, after the stirring of the coal and the polymer water-absorbing agent was repeated by the stirring operation by the operation of repeatedly switching the scraping direction with the bucket of the continuous unloader, the unloading operation was continued.
As a result, the action of adsorbing the powder particles and the spring water molecules in the suspended spring water with the polymer water absorbent is facilitated by adding the polymer water absorbent to the suspended spring water Wm, and the unloading becomes easy. I was able to confirm.
As with iron ore, even with coal, stirring only by repeatedly switching the scraping direction may cause polymer water absorbents to gather together to form large lumps, easily clogging with a hopper, and the polymer water absorbent is dispersed. Even if it can, the swollen body is easy to jump, and there is a fear of falling from the belt conveyor during transportation, so the ratio of the weight of the rose and the weight of the polymer water absorbent that absorbed the suspended spring water is the ratio of the fine ore (-) By setting the value to 7 or more, the swollen body (polymer water-absorbing agent) that absorbed suspended spring water in the rose was further dispersed.

When spring water was observed during unloading, a large amount of water remained in the bottom of the ship, but the remaining water was also reduced by the above treatment.
From the above results, in the past, when unloading to land, which was refrained from unloading in heavy rain, when the above-described unloading method conforming to the present invention is adopted, when the normal efficiency is assumed to be 100%, it takes a long time. Even when unloading during heavy rain, an efficiency of about 95% was achieved.

  In addition, since the use of the polymer water-absorbing agent is too small in both Examples 2 to 4, after being unloaded on the land by a belt conveyor via a grab bucket or bucket, it is stacked in a raw material yard, and iron ore is baked as it is. As a raw material, coal could be used as a coke raw material.

  An example will be given of the unloading of a Carajas iron ore, which is an iron ore that separates moisture and bulk from the import process and causes spring water to accumulate at the bottom of the hold when it arrives in Japan.

  In unloading iron ore in the state shown in FIG. 6 (a), when unloading Carajas iron ore with a moisture value of 7.9 mass% to 24.7 mass% from the carrier, the acrylamide polymer flocculant is suspended. On the other hand, an amount such that the chemical concentration corresponding to 0.6 mass% was obtained was added. The amount of polymer flocculant relative to the amount of suspended spring water Wm is generated in the recess after the suspended spring water Wm is scraped (excavated) by the bucket of the continuous unloader. The amount of depression was obtained from the amount of excavation based on the above, the suspended spring water Wm generated in this depression was estimated, and the amount of the polymer flocculant to be added was determined. Similarly, the numerical value 7, which is a ratio of the weight of the loose material to the weight of the suspended spring Wm including the polymer flocculant, expressed as a weight ratio, also obtains the amount of depression from the excavation amount based on the bucket capacity and the excavation depth. The amount of suspended spring water Wm generated in this depression was estimated.

Next, after adding a polymer flocculant to the suspended spring water Wm generated in the depression generated in the ore deposit in the hold, the roses (carajas iron ore) around the suspended spring water Wm About 10 times as much as the suspension spring Wm was added to the suspension spring Wm, and the roses were scraped using a bucket and stirred for 30 to 80 seconds.
That is, after the stirring of the bulk material and the polymer flocculant was repeated by the stirring operation by the operation of repeatedly switching the scraping direction with the bucket of the continuous unloader, the unloading operation was continued.
As a result, by adding a polymer flocculant to the suspended spring water Wm and stirring, the powder particles and the spring water in the suspended spring water Wm are entangled with the polymer polymer in the same way as when using a grab bucket. The action to take is promoted, and the particles condensed by the polymer form larger lumps (aggregated particles) and can be unloaded.

  In particular, a large amount of spring water has remained in the bottom of the ship, but the remaining water is hardly seen by the above treatment. From the above results, in the conventional transport of Carajas iron ore, there is a lot of water in the Carajas iron ore itself, and a lot of spring water is generated when unloading to land, so intermittent removal of suspended spring water Wm (drainage) ) If the above-mentioned unloading method conforming to the present invention is adopted while performing the work, the unloading work is 65% when the efficiency is 100% when no spring water is generated. However, it was possible to achieve an efficiency of about 93%.

  In the following, an example of unloading iron ore that has continued to be unloaded by continuous unloader during heavy rain and has become excessively watery will be described.

During the heavy rain, unloading with the bucket of the continuous unloader as shown in Fig. 7 was continued, and the unloading work progressed, and spring water began to be observed due to high moisture due to heavy rain when reaching the lower layer part of the latter half of the unloading (Fig. 8 ( When the iron ore in the state shown in a) was unloaded from the carrier ship, an amount of acrylamide polymer flocculant was added to a concentration of chemical solution corresponding to 0.6 mass% with respect to the amount of suspended spring water.
The amount of the polymer flocculant with respect to the amount of the suspended spring water Wm is generated in the depression after the suspended spring water Wm is excavated with the bucket. Therefore, the amount of depression is calculated from the excavation amount based on the bucket capacity and the excavation depth. The amount of suspended spring water Wm generated in the depression was estimated and the amount of the polymer flocculant to be added was determined.
Similarly, the numerical value indicating the ratio of the weight of the bulk material to the weight of the polymer flocculant that absorbed suspended spring water (the ratio of fine ore) as the weight ratio described later is also the amount of excavation based on the bucket capacity and the excavation depth. It was estimated from.

Next, after adding a polymer flocculant to the suspended spring water Wm generated in the hollow portion generated in the bulk sediment layer in Funakura 1, scrape the bulk material around the suspended spring water using a bucket. The suspension was poured into the spring water and stirred using a bucket.
That is, after the stirring of the bulk material and the polymer flocculant was repeated by the stirring operation by the operation of repeatedly switching the scraping direction with the bucket of the continuous unloader, the unloading operation was continued.
As a result, by adding a polymer flocculant to the suspended spring water Wm and stirring, the action of entwining the powder particles and the spring water in the suspended spring water Wm with the polymer polymer is promoted, and the particles condensed by the polymer Made a larger lump (agglomerated particles) that could be unloaded.

When spring water was observed during unloading, a large amount of water remained in the bottom of the ship in the past, but only a small amount of residual spring water was observed by the above treatment.
Based on the above results, conventionally, unloading during heavy rain was refrained. However, when the above-mentioned unloading method conforming to the present invention is adopted when unloading to land, the efficiency of about 87% is achieved even when unloading during heavy rain for a long time when the normal efficiency is set to 100%. I was able to.

  In the following, an explanation will be given by taking as an example an iron ore that has continued to be unloaded by a continuous unloader during heavy rain and has become excessively watery in a state in which the polymer flocculant alone cannot be modified (the fine ore ratio is less than 7).

During heavy rain, unloading with a continuous unloader bucket as shown in Fig. 9 was continued, and unloading work progressed, and spring water began to be observed due to high moisture due to heavy rain when it reached the lower layer part of the latter half of unloading (Fig. 9 ( When the iron ore in the state shown in a) is unloaded from the carrier ship, the acrylamide polymer flocculant is added to the suspended spring water in such an amount that the chemical concentration is equivalent to 0.6 mass%, and then More than 1.0 to 2.0 mass% of a polyacrylate resin granule, which is a polymer water-absorbing agent, was added with respect to the amount of suspended spring water that is less than 7 in terms of the powder ore ratio.
The amount of the polymer water-absorbing agent and the polymer flocculant added to the amount of the suspended spring water Wm is based on the bucket capacity and the excavation depth because the suspended spring water Wm is generated in the depression after excavating with the bucket. It was estimated from the amount of excavation, and was performed by determining the amount of drug to be added.

Next, after adding a polymer flocculant and a polymer water-absorbing agent to the suspended spring water Wm generated in the hollow portion generated in the rose deposit layer in Funakura 1, the bulk material around the suspended spring water is removed. Using a bucket, it was poured into the suspension spring and stirred using a bucket.
That is, after the stirring of the rose, the polymer flocculant, and the polymer absorbent was repeated by the stirring operation by repeatedly switching the scraping direction with the bucket of the continuous unloader, the unloading operation was continued.
As a result, by adding a polymer water-absorbing agent to the suspended spring water Wm and stirring, the water that could not be modified by the polymer flocculant alone was adsorbed by the polymer water-absorbing agent, and the remaining suspended spring water powder The modification of body particles and spring water molecules by the polymer flocculant was promoted, and unloading became easier.
The order of addition of the polymer water-absorbing agent and the polymer flocculant was reversed, or the same effect was obtained even when they were added simultaneously.

When spring water was observed during unloading, a large amount of water remained in the bottom of the ship, but the remaining water was hardly seen by the above treatment.
Based on the above results, conventionally, unloading during heavy rain was refrained. However, when the above-mentioned unloading method conforming to the present invention is adopted when unloading to land, an efficiency of about 90% is achieved even when unloading during heavy rain for a long time when the normal efficiency is set to 100%. I was able to.

  An explanation will be given below of iron ore that continues to be unloaded by a grab type unloader during heavy rain and has become excessively watery in a state where the polymer flocculant cannot be modified alone (the ratio of the fine ore is less than 7).

During heavy rain, unloading with a grab type unloader as shown in Fig. 10 was continued, and unloading work progressed, and spring water began to be observed due to high moisture due to heavy rain when reaching the lower layer part of the latter half of unloading. When the iron ore in the state shown in Fig. 2 is unloaded from the carrier, an amount of acrylamide polymer flocculant is added to the suspension spring water so that the chemical concentration is equivalent to 0.6 mass%, More than 1.0 to 2.0 mass% of a polyacrylate resin granule, which is a polymer water-absorbing agent, was added to the amount of suspended spring water that was less than 7 in the mineral ratio.
The amount of the polymer water-absorbing agent and the polymer flocculant added to the amount of the suspended spring water Wm depends on the bucket capacity and the excavation depth because the suspended spring water Wm is generated in the depression after excavating with the grab bucket. It was estimated by the amount of excavation based on the method, and the amount of drug to be added was determined.

Next, after adding a polymer water-absorbing agent and a polymer flocculant to the suspended spring water Wm generated in the hollow portion generated in the ore deposit in the hold, the roses around the suspended spring water Wm ( Carajas iron ore) was added to the suspended spring water Wm and stirred for 30 to 80 seconds using a grab bucket. That is, after each operation of grabbing roses (polymer flocculant) and opening and dropping with a grab bucket was repeated, the unloading operation was performed.
As a result, by adding a polymer water-absorbing agent to the suspended spring water Wm and stirring, the water that could not be modified by the polymer flocculant alone was adsorbed by the polymer water-absorbing agent, and the remaining suspended spring water powder The modification of body particles and spring water molecules by the polymer flocculant was promoted, and unloading became easier.
The order of addition of the polymer water-absorbing agent and the polymer flocculant was reversed, or the same effect was obtained even when they were added simultaneously.

When spring water was observed during unloading, a large amount of water remained in the bottom of the ship, but the remaining water was hardly seen by the above treatment.
Based on the above results, conventionally, unloading during heavy rain was refrained. However, when the above-mentioned unloading method conforming to the present invention is adopted when unloading to land, an efficiency of about 93% is achieved even when unloading during heavy rain for a long time, assuming that the efficiency during normal times is 100%. I was able to.

  The above-described technique for unloading roses according to the present invention can be applied to the unloading work of loose objects such as gravel, sand, and grains in addition to the exemplified hydrous ore and coal.

DESCRIPTION OF SYMBOLS 1 Funakura 2 Bulk material 3 Puddle 4 Dimple 5 Bucket A Moisture adsorption agent C Iron container P Powder Wm Suspension spring water

Claims (7)

When unloading hydrous bulk material such as ore and coal from a cargo ship using a bridge crane, an unloader grab bucket, or a continuous unloader bucket, the suspension of powder particles suspended in spring water during the unloading operation. When cloudy spring water is generated, a polymer flocculant and a moisture adsorbent are added to the suspended spring generation position, and by adding the polymer flocculant, condensed particles and aggregated particles are generated, and aggregated particles, unloading method at least from by adsorb moisture adsorbents for spring water, water rose product and performing unloading with roses of the suspension spring water partial product is not agglomerated particles . 2. The method for unloading a hydrous rose according to claim 1, wherein a polymer water-absorbing agent is used as the moisture adsorbent. The method for unloading hydrous roses according to claim 1 or 2 , wherein the water adsorbent is added in an amount equivalent to more than 0.5 to 3.3 mass% of the amount of suspended spring water. The method for unloading water-containing roses according to claim 1 or 2 , wherein the moisture adsorbent is added in an amount equivalent to 1.0 to 2.0 mass% of the amount of suspended spring water. The method for unloading hydrous roses according to any one of claims 1 to 4, wherein the polymer flocculant is added in an amount equivalent to 0.4 to 1.0 mass% of the amount of suspended spring water. The addition of the moisture adsorbent to the occurrence position of the suspension springs, Rutotomoni subtracting at least spring water of the suspension Spring water, by the addition of the polymeric flocculant, were allowed to produce aggregated particles, the aggregated particles, The method for unloading a hydrous rose according to any one of claims 1 to 5, wherein unloading is performed together with the rose. The method for unloading hydrous roses according to any one of claims 1 to 6 , wherein the fine ore ratio (-) represented by the ratio of the weight of the rose material and the suspended spring water is 7 or more. .

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