TW201425196A - Method for unloading water-containing bulk material - Google Patents

Abstract

According to the present invention, after adding, as a liquid chemical, an agent having a polymer flocculant as the main ingredient to a water-containing bulk material on a belt conveyor, a bridge crane, or in a hopper on an unloader and producing water containing bulk material and suspended aggregates in water, aggregates are inevitably formed when unloading water-containing bulk material by way of transporting with a belt conveyor, and damage due to unloading on the belt conveyor can be eliminated by the slurry water.

Description

Unloading treatment method for water-containing bulk cargo

The present invention relates to an unloading treatment method for an aqueous bulk cargo, which is for unloading cargo from a transport vessel or barge by means of a hopper of a bridge crane, an unloader or a continuous unloader in an aqueous bulk cargo containing ore, coal or the like containing moisture. At the same time, the development of the unloading obstacle on the belt conveyor caused by the generation of water inrush was eliminated.

Most of the bulk cargo such as ore and coal is imported from abroad, and most of it is transported by ships. These bulk cargoes, especially ore and coal, have been mostly high-moisture in recent years, and their moisture (gushing water) is separated from bulk cargo during transportation and becomes a state of accumulation in the bottom of the cabin. As a result, in the middle or the second half of the unloading process of the unloader or the like, a sag is generated after the grab for unloading, which not only generates and accumulates the suspended water in a state in which the powder and the turbid water are turbid, and soon after. It becomes a mud state and there is a problem of causing unloading obstacles. This problem also occurs in the unloading process of the hopper of a continuous unloader composed of a bucket conveyor or the like.

In addition, when heavy rain occurs from the unloading of the ship, whether or not the unloading continues, the bulk cargo becomes high in moisture, and rainwater forms in the cabin. At the bottom of the state, there is also a phenomenon of unloading obstacles.

This is also the case in countries with rainy seasons. If there is no roof to cover the ship, the bridge crane, and the unloader, the bulk cargo in the unloading will become high in moisture, and will quickly become muddy as it continues to unload. There is a problem leading to the obstacle of unloading.

In response to such a problem, the methods disclosed in Patent Documents 1 and 2 have been proposed, that is, when water is generated by a drain device (suction device), the method of unloading is started.

Advanced technical literature Patent literature

Patent Document 1: Japanese Laid-Open Patent Publication No. 60-204526

Patent Document 2: Japanese Shigongzhao 50-13339

Patent Document 3: Japanese Laid-Open Patent Publication No. 61-60784

Patent Document 4: Japanese Laid-Open Patent Publication No. 61-164658

However, in the method of extracting and draining waters proposed in Patent Documents 1 and 2, in order to extract water inrush, it is necessary to move the ship to a place where there is a drain (draw) device, or to move the drain (sucking) device itself to take it out of the cabin, etc. There is a problem that the working time becomes longer.

In particular, the so-called gushing water is grabbed by grabs during unloading. Since the depression generated in the subsequent generation occurs, in the above-described drainage method, the water rushing operation must be repeated over and over again, and the unloading operation is interrupted and restarted, and the work efficiency is greatly lowered.

Especially in recent years, ore and coal have become inferior, for example, those with high water content have made the above problems more significant.

Moreover, if the water content of the unloaded ore and coal is high, the bulk cargo becomes easy to flow from the occurrence of water inrush, which hinders the handling of the belt conveyor at the time of unloading, and often occurs in addition to the trouble of handling. Problems with the maintenance of belt conveyor equipment.

Further, in the prior art proposed in Patent Documents 1 and 2, only the water-sucking water is estimated, but the concave portion generated after the grab is grasped, and the powder having a small particle diameter after being separated from the bulk material having a large particle size Most of the inflows form muddy (mud). When such a slurry-like liquid is taken, it is difficult to draw by conventional drainage equipment, and the work efficiency at the time of generating water inrush is further lowered. In the case of direct unloading, as described above, the bulk cargo after unloading is rich in fluidity, It is easy to flow out of the belt conveyor, which in turn causes unloading obstacles.

For these problems, the inventors focused on the water content reduction methods proposed in Patent Documents 3 and 4 and studied them in turn. However, in the methods described in the above Patent Documents 3 and 4, since the solid water-absorbent resin is used, it is difficult to uniformly contact the bulk cargo during unloading, and the water-absorbent resin is swollen when it contains moisture. The problem of falling from the belt conveyor. Moreover, since the water-absorbent resin must eventually be separated from the bulk cargo, it is extremely difficult to use it for unloading of water-containing bulk cargo.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an unloading processing method for an aqueous bulk cargo, which is used for eliminating unloading of a belt conveyor caused by muddy water inevitably generated when unloading of an aqueous bulk cargo. obstacle.

That is, the gist of the present invention is as follows.

1. An unloading treatment method for an aqueous bulk cargo, which is to use an overhead crane of a bridge crane or an unloader to discharge an aqueous bulk cargo containing ore and coal from a cargo ship to a belt conveyor when suspended in powder The suspended water is generated and contained in the water-containing bulk cargo, so that the moisture content of the water-containing bulk cargo is increased, and the above-mentioned water-containing bulk cargo is added to the above-mentioned belt conveyor or the hopper in the above-mentioned bridge crane or unloader. The drug containing the polymer aggregating agent as a main component of the drug solution becomes an agglomerate of the water-containing bulk cargo and the suspended water, and the aggregate is transported by a belt conveyor.

2. The method for unloading an aqueous bulk cargo according to the above 1, wherein the amount of the chemical liquid added is in the range of 0.1 to 1 mass% with respect to the moisture content of the bulk cargo.

3. The method for unloading an aqueous bulk cargo according to the above 1 or 2, wherein the amount of the chemical liquid added is in the range of 0.15 to 0.4 mass% with respect to the water content of the bulk cargo.

4. The method for unloading an aqueous bulk cargo according to any one of the above 1 to 3, wherein the bulk cargo, the water immersion and the chemical in the aggregate of the water-containing bulk cargo are further mixed in a drop portion of the belt conveyor connection portion. to make.

5. The method for unloading an aqueous bulk cargo according to any one of the above 1 to 4, wherein the agent is added to the belt conveyor in a form of spreading, and the agent that reaches the belt conveyor after being spread is used in the foregoing The drop portion of the belt conveyor joint portion is again mixed with the agglomerate of the aforementioned water-containing bulk cargo.

6. The method for unloading an aqueous bulk cargo according to any one of the above 1 to 4, wherein the agent is added to the belt conveyor by spraying in a mist form, and the agent after reaching the belt conveyor after spraying is The drop portion of the belt conveyor joint portion is again mixed with the agglomerate of the water-containing bulk cargo.

7. The method for unloading an aqueous bulk cargo according to any one of the above 1 to 6, wherein the moisture content of the aqueous bulk cargo is controlled to be 23 mass% or less.

8. The method for unloading an aqueous bulk cargo according to the above 7, wherein the moisture content of the aqueous bulk cargo is controlled by adding a polymer water absorbing agent.

According to the present invention, in the course of unloading cargo in the cargo ship's cabin, even if the suspended water in suspension of the powder is generated and contained in the bulk cargo, the moisture content of the bulk cargo rises, and the bulk cargo can still be in bulk water. The water-containing conveyor does not overflow under the belt conveyor, and does not require the operation of suspending water. Therefore, it is not necessary to make unloading as before. The business is interrupted, and continuous unloading operations can be carried out to improve the unloading efficiency.

1‧‧‧ cabin

2‧‧‧Bulk goods

3‧‧‧suspended water

4‧‧‧ dent

5‧‧‧Unloader

6‧‧‧ Grab

7‧‧‧Small condensed particles

8‧‧‧ Large aggregated particles

A‧‧‧ polymer agglutinating agent

B‧‧‧Polymer

P‧‧‧ powder

Wm‧‧‧ water

Fig. 1 is an explanatory view showing a state in which a bulk cargo in a cargo ship is unloaded using a grab of an unloader.

Fig. 2 (a) to (e) are conceptual diagrams illustrating the action of adding a polymer flocculant to suspended water.

Fig. 3 is a conceptual diagram showing a state in which a chemical liquid (containing a polymer aggregating agent) is sprayed in a mist form to discharge unloading.

Fig. 4 is a conceptual diagram showing a state in which a chemical liquid (containing a polymer aggregating agent) is sprayed in a spray state to discharge unloading.

Fig. 5 is a conceptual diagram showing a spray method for promoting the adhesion of a chemical solution when a chemical solution (containing a polymer aggregating agent) is sprayed in a mist form to discharge unloading.

Figure 6 shows the transport chart for the ore-specific ship and the belt conveyor after unloading.

Fig. 7A is a diagram showing the appearance of the ore heap of Carajas iron ore obtained according to each experimental condition (test i~iii).

Fig. 7B is a diagram showing the appearance of the ore pile of Caragas iron ore obtained according to each experimental condition (test iv~vii).

Fig. 8 is a view showing a photographing portion of a joint portion of the return side of the belt conveyor and the end position of the belt conveyor.

Hereinafter, the present invention will be specifically described.

Generally, as shown in Fig. 1, the hopper of the bridge crane, the unloader 5, or the continuous unloader is used to store the cargo ship's cabin (cargo compartment) 1 as water-containing bulk cargo 2 (hereinafter, also In the case of unloading of ore and coal (hereinafter referred to as "ore"), which is referred to as "bulk cargo", water accumulated in the lower part of the ore-like deposit layer may be generated by water inrush. Further, when the unloading operation is performed, when the unloading operation reaches the lower portion from the middle layer of the ore-like accumulation layer, the recess 4 is generated in one portion of the water-containing bulk cargo accumulation layer. In the recess 4, it is known that mainly a suspended water 3 is accumulated, and the suspended water 3 is dispersed and suspended in a powder separated from the gravel ore. In addition, in the figure, 1 is a cabin, 2 is an aqueous bulk cargo, 3 is a suspended water, 4 is a depression, 5 is an unloader, and 6 is a grab.

The suspended water 3 generated by the accumulation layer of the water-containing bulk cargo 2 in the cabin 1 is gradually muddy together with the unloading, and it becomes difficult to unload the cargo by the grab 6 of the unloader 5. This is because once the pulverizer is caught by the grab 6, for example, it will flow out from the hopper (not shown) in the unloader and the belt conveyor (not shown), so that the unloading cannot continue. Especially at the bottom of the cabin 1, a large amount of suspended water is muddy, which often causes the unloading operation to be interrupted and must be drained.

Therefore, in the present invention, when the moisture content of the bulk cargo is high and the loading and unloading efficiency is deteriorated, the bulk cargo or unloading loaded in the hopper in the unloader (including the continuous unloader) is bulk on the belt conveyor. The product is added with a polymer agglutinating agent to cause the particles to coagulate, agglomerate and granulate, that is, the water can be transported together with the bulk cargo by the agglomerate, thereby preventing the unloading operation Broken, seeking to improve the efficiency of unloading. In other words, according to the present invention, the water immersion water 3 is suspended together with the water-containing bulk cargo 2 such as ore, and it is said that the constituent components of the suspended water 3 are in a solid state (aggregate) and can be brought by the belt. Conveyor handling.

Further, the water content (amount) in the present invention is a ratio of the moisture content of the mass of the bulk cargo.

[The principle of transportable]

Fig. 2 (a) and (b) show the water Wm contained in the suspended water containing the powder P and the polymer aggregating agent A added to the water Wm. After adding this A to P+Wm, as shown in Fig. 2(c), a part of Wm and P is entangled and caught by the polymer B in the polymer agglomerating agent A, and is condensed and formed. Several coagulated particles 7 having a small particle diameter as shown in Fig. 2(d). Then, the mixture is mixed (including falling and mixing at the joint portion), and a plurality of the condensed particles 7 are aggregated (assembled) soon, and grown into aggregated particles 8 having a large particle diameter as shown in Fig. 2(e). Therefore, the agglomerate of the aqueous bulk cargo in the present invention is composed of the aggregated particles and the coagulated particles described above in an arbitrary ratio (or 100% of either). Further, the % mark in the present invention means, unless otherwise specified, mass%.

When the step is as shown in Fig. 2(e), Wm becomes a solidified state and adheres to the attached state of the bulk cargo. By changing to this state, it is easy to carry the bulk cargo by the belt conveyor, and the suspended water itself can be transported together with the bulk cargo without overflowing from the belt conveyor, so It is easy to deliver bulk goods to the raw material storage yard.

Further, since the components constituting the chemical liquid in the present invention are N, C, and H, which are burned by the sintering machine of the next step, and do not remain in the product, the chemical liquid separation is not required. Thus, the present invention has the advantage of not requiring a chemical separation step.

In addition, as described above, when water or bulk cargo overflow occurs, the conveyance roller and the drive system are also hindered by the conveyance of bulk cargo or the like due to the adhesion of water or adhesion powder generated on the back surface of the belt conveyor. In the present invention, since the water or the bulk cargo does not overflow from the belt conveyor, the bulk cargo can be effectively prevented from being transported even when the bulk cargo is transported at a high water content. And other issues.

Here, Fig. 3 is an explanatory view of a case where the bulk cargo discharged from the belt conveyor is sprayed evenly on the surface in a spray state. In this case, the polymer aggregating agent adheres only to the surface of the bulk cargo and the Wm mixture, but it is an example of a form that can be sufficiently carried out as long as it is a bulk cargo having a moisture content of several percent.

Further, as a preferred embodiment of the present invention, a discharge of water-containing bulk cargo having a high water content generated from the occurrence of suspended water and a generation of suspended water and a high water content bulk which continues thereafter are exemplified. When the goods are unloaded, the addition of the polymer agglomerating agent for the high water content bulk cargo is carried out in the form of spreading, and the polymer agglutinating agent reaching the belt conveyor is spread at the joint portion of the belt conveyor by spreading. Part of the drop, discharge (re-spread) to the falling bulk cargo, water. By this form, the aforementioned coagulation (which may also include pseudo-particles) and agglutination are promoted. It is used to make the unloading operation more efficient.

Specifically, as shown in FIG. 4, the agent containing the polymer flocculant as a main component is directly sprayed as a chemical solution, and the polymer aggregating agent supplied in a spray form is attached to the bulk. Outside the surface of the goods, it is spread by means of bulk cargo reaching the surface of the belt conveyor. By spreading in this state, even if the adhesion of the polymer flocculant occurs unevenly in the width direction of the bulk cargo, for example, when it is transported to the belt conveyor connecting portion (discharge port), the polymer remaining on the surface of the belt conveyor The agglutinating agent will be mixed with the fallen bulk cargo and the water, and the polymer agglutinating agent and the bulk cargo and the water are mixed to promote the bulk cargo, water rushing, and polymer agglutination. The agent is mixed as agglomerate.

Furthermore, Figure 5 shows other spray essentials. In other words, not only the mist of the polymer flocculant is sprayed on the surface of the bulk cargo but also adhered to it, and the polymer aggregating agent is sprayed on the side of the so-called back surface (inside) on the upstream side of the belt conveyor. The agent containing the main component is directly used as a mist of the chemical liquid, and a drug containing a polymer aggregating agent as a main component is further sprayed on the surface thereof as an example of a mist of the chemical liquid. By using this spray method, the polymer flocculant is mixed with bulk cargo and water in a good effect, and even if it is supplied in a spray state, the mixing with the polymer flocculant can progress, and bulk cargo, water rushing, and polymer agglomeration can occur. The promotion of the agglutination of the agent.

[polymer agglutinating agent]

The present invention relates to a medicament containing a polymer aggregating agent as a main component use. Alternatively, as long as the drug is solid, it is used as a drug solution even if it is dispersed in a solution.

In addition, as the polymer flocculating agent, if the powder is adsorbed by the electrostatic force or the hydrogen bond of the polymer, the powder crosslinks between the powders, and the solidified structure is formed to form the coagulated particles. Any effect of (aggregate) can be used. For example, a polypropylene amide type (copolymer of acrylamide and sodium acrylate), a polyethylene oxime system, an amphoteric polymer aggregating agent, etc. of a powder, granule or liquid organic aggregating agent, not only coagulation It is also better to exert agglutination. Further, a well-known inorganic aggregating agent may be further mixed and used.

Further, as the polymer flocculating agent, an acrylic cationic polymer, an acrylamide-based cationic polymer, a methacrylic polymer, a methacrylic acid urethane cationic polymer, a ruthenium polymer, or an anionic W/ may be used. O-type emulsion polymer and the like.

In the present invention, the polymer aggregating agent is a drug containing a polymer aggregating agent which is generally considered to have an aggregating effect or more, and is usually a drug having a content of about 40% or more of a polymer aggregating agent. Of course, 100% of the polymer flocculant may be used as a chemical directly.

In addition, when the chemical is used as a solid or diluted, the solution may be water or an organic solvent, and the solute may be a polymer of C, H, N or O, and the solvent may be a hydroxyl solvent (C, H, O only) ).

Further, the amount of the chemical liquid to be added in the present invention is preferably about 0.1 to 1% based on the water content of the bulk cargo.

In other words, when the above range is satisfied, it has been confirmed from the test results described later that the fluidity due to excessive moisture is not lowered and the adhesion at the time of excessive deposition of the aggregating agent is not observed.

Further, the above-mentioned addition amount is preferably from about 0.15 to 0.4% with respect to the water content of the bulk cargo. Further, in the present invention, the ratio (amount) of the chemical liquid to be added is as described above with respect to the water content of the bulk cargo.

In addition, the rate of addition of the chemical liquid is not particularly limited, and may be appropriately set depending on equipment or the like, and may be, for example, about 2 to 10 (L/min).

Next, in order to confirm the effect of the present invention, an experiment conducted using the conveyance route shown in Fig. 6 will be described.

The experiment used a caramel of 700% of Carajs iron ore with a water content of 9.6% and an unloader as a means of unloading.

The usual ore has water retention, but the Caragas iron ore has less water retention and a water content of about 8.0%, which is an ore that is worried about the occurrence of suspended water and which hinders unloading.

The experimental conditions of Test 1 are shown in Table 1. In the experiment, the above-mentioned Caragas iron ore having a moisture content of 9.6% was used, and the latter was changed by the method of adding the chemical solution, the amount of the ore, the rate of addition of the chemical solution, and the concentration. In addition, the so-called flow time in the table refers to the time when the agent is added.

Further, the polymer aggregating agent in the drug is a polymer cationic acrylic polymer, a acrylamide-based cationic polymer, a methacrylic polymer, a methacrylic acid urethane cationic polymer, a ruthenium polymer, an anionic property. The W/O type emulsion polymer or the like is used as a chemical solution directly.

The unloading of the ore-specific ship uses the unloading method attached to the unloader, and the second belt conveyor (OR-62) after the first belt conveyor that runs along the dock is used as an experiment. The liquid is added to the location. In the figure, the positions a to f surrounded by the four corners of the broken line respectively indicate the belt conveyor connecting portion. Therefore, in this experiment, the belt conveyor connection part is the end of the second belt conveyor (OR-62) b, the end of the third belt conveyor (OR-63S) c, the fourth belt conveyor (OR- 74R) End d, 5th belt conveyor (OR-75) end e, and 6th belt conveyor (OR-24) end f total 5 places. The first belt conveyor (OR-61) is the leading belt conveyor for grab unloading.

In addition, the first belt conveyor can also be used as a chemical liquid addition position.

The experimental results are illustrated by Figure 7 and Table 1.

From the unloading process of the above-mentioned ore special ship, the ore pile of Caragas iron ore obtained according to the experimental conditions shown in Table 1 above is shown in Fig. 7 using each 100t of ore. In the example of the experiment 1 (test i) in which the polymer flocculant was not used, the outflow portion of the bulk cargo was observed in the haw portion of the ore heap. The part that flows out like this is transported by belt When the machine transports the bulk cargo, it will adhere to the conveyor belt and overflow from the conveyor belt. In addition to the above-mentioned adhesion to the back of the belt conveyor, the conveyance is hindered, and it is presumed that it will adhere to the conveyor roller and the drive system and become a cause of failure. It is predicted that there will be a blockage accident caused by the occurrence of deposits or the like in the belt conveyor connection portion.

Examples of Experiment 2 (Test ii) and Experiment 5 (Test v) are examples in which a chemical solution is added in a mist state at a ratio of 0.22% to 0.34% (spray addition).

The example of Experiment 2 (Test iii) was that no bulk cargo outflow portion was observed in the haw portion of the ore pile, but the occurrence of conveyor belt attachment was confirmed. It is speculated that due to the addition of mist, the amount of the polymer aggregating agent mixed with bulk and water is insufficient.

On the other hand, in the example of Experiment 5 (test v), even in the case where the ratio of the addition of the chemical liquid is increased, the powder block (clump) is observed in the haw portion of the ore heap, and the conveyor belt attachment is not produced, but when When the mass is generated, it is predicted that it will fall from the belt conveyor. The powder block (clump) is considered to be a mixture unevenness of the polymer flocculant, and is considered to be generated in a portion having a large amount of the chemical solution.

Further, in the above-mentioned prediction, when the chemical liquid is added in a state where the ore is not placed on the belt conveyor, the highly viscous drug is deposited in the lower portion of the conveyor belt in the cleaning portion of the tail portion (reverse portion) of the conveyor belt. The reason for the phenomenon.

The examples of Experiment 3 (test iii), 4 (test iv), 6 (test vi), and 7 (test vii) are used to explain the difference in the way the liquid medicine is added, that is, the difference between the mist spray method and the linear spray method. The winners are added at a ratio of 0.19%, 0.24%, 0.36% and 0.17% respectively. The liquid medicine is added, and the bulk cargo which is unloaded on the belt conveyor is sprayed in a straight line, that is, an experiment in which the liquid medicine is added in the form of sprayed from above.

As a result of the above experiment, it was considered that the linear method was less than the mist (spray addition), the amount of addition was small, and an advantageous effect was obtained, and no occurrence of conveyor belt attachment was observed. Further, in the examples 4 and 6 in which the chemical solution was added at a high ratio (addition ratios were 0.24% and 0.36%, respectively), small agglomerates were observed in the haw portion of the ore heap, but the degree was not predicted to occur. Obstruction from falling on the belt conveyor.

In addition, the above prediction is based on the fact that the surface is not adhesive when the agglomerates are actually touched by hand.

The above results are as described in the above-mentioned third drawing. When the polymer flocculant is uniformly sprayed on the surface of the bulk material in a spray state, adhesion of the polymer flocculant does not occur only on the surface of the mixed product of bulk cargo and Wm. Further, even if the bulk cargo and the Wm are transported to the belt conveyor connecting portion (discharge port) in this state, only the bulk cargo having no polymer flocculating agent attached to the surface is not promoted by the adhesion of the polymer flocculant. However, it is directly transported after the bulk cargo and Wm are separated. Thus, various obstacles (evaluation: Δ or ×) are caused by the overflow from the belt conveyor.

Further, in the above experiment, the evaluation criteria of ○, △, and × in Table 1 are as follows.

○: The whole body has been modified and has no clumps, and the surface is not sticky.

△: The whole body has been modified, but there is a sticky part (clump) due to too much of the drug.

×: In addition to the part that can be modified and the part that cannot be modified, there are also parts with too much drug (clump)

Further, in the case of adopting a linear spreading form (see Fig. 4), as shown in Fig. 4, the polymer flocculant reaches the surface of the belt conveyor through the bulk cargo. Therefore, for example, even when the amount of the polymer flocculating agent on the surface of the bulk cargo is unevenly distributed, the polymer agglutinating agent remaining on the surface of the conveyor belt is still transported when transported to the belt conveyor connecting portion (discharge port). In the state in which the falling bulk cargo and the water are mixed, the polymer aggregating agent is further mixed, and it is estimated that the above evaluation is ○.

[Example of addition range]

The following experiment was carried out on the agent containing the polymer flocculant used in the present invention as a main component.

The chemicals to be used are kurisat (registered trademark, manufactured by Kurita Industrial Co., Ltd.) in Table 2, and hybrid polymer α (registered trademark, manufactured by Technica Goudou Co., Ltd.) in Table 3. Both are proposals for use as agents for soil amendments.

After adding water to the Caragas iron ore and adjusting the water content, the above-mentioned agent is directly added as a chemical solution, and the stirring time is adjusted to determine whether it can be modified.

Here, at a water content of 9.6%, in Table 1, it is understood that as long as there is no problem according to the present invention, the present experiment is directed to whether the results of the experiment shown in Table 1 can be the same at a moisture content exceeding 9.6%. Land reform The experiment was carried out without problems on the quality of unloading. Whether the modified system can be transported by a belt conveyor can be a criterion for the determination of the reform.

As shown in Table 2, kurisat was used as a chemical solution as a chemical solution, and the moisture content of the bulk cargo was more than 12% of 9.6%, and an experiment was conducted to confirm whether the bulk cargo could be modified. The amount of the chemical solution added was 0.4% in the first experiment. Further, a second experiment of 1.0% was also carried out by increasing the amount of the chemical solution added.

As a result, as shown in Table 2, even if the moisture content of the bulk cargo exceeds 20% of the moisture content of 9.6%, the bulk cargo can be modified, and if the water content is 24% or more, the bulk cargo becomes difficult to be modified. .

Next, the second experiment was carried out with the concentration of the chemical liquid added from 0.4% to 1.0%. However, similarly to the first experiment, if the moisture content of the bulk cargo was 24% or more, the result of difficulty in upgrading the bulk cargo was obtained.

Next, as shown in Table 3, the mixed polymer α was used as a medicine. The agent was used as a chemical solution, and the experiment was carried out at a moisture content of more than 9.6% of the bulk of the bulk cargo. Moreover, from the results shown in Table 2, when the moisture content of the bulk cargo is 24% or more, the improvement of the bulk cargo is difficult, so one of the test levels of the water content is changed from 24% to 23%. . However, the highest water content was tested at 54% in the same manner as the experiment described in Table 2 above.

The third experiment was carried out with the added concentration of the chemical solution being 0.1%. As a result, even if the moisture content of the bulk cargo exceeds 20% of 9.6%, the modification of the bulk cargo is still a possible result. Among them, when the bulk cargo has a moisture content of 23%, it is known that there is a problem in upgrading. That is, the bulk cargo is only slightly solidified. Therefore, in order to solve this problem, the experiment was again carried out with the added concentration of the chemical solution being 0.1% to 0.2%. As a result, it was confirmed that the above problem can be solved in such a manner that the concentration of the chemical solution is increased under the condition that the water content is 23%. Thus, in the present invention, the unloading of iron ore in Caragas is judged. In time, it can be carried out at a water content of 23% or less.

In the unloading of Caragas iron ore, it is determined based on the moisture content of the suspended water, using a neutral analyzer such as a neutral moisture meter, or taking samples by an automatic sampler, and using the simple moisture measurement in the analysis center. When the water content is more than 24%, the water in the part with low moisture content will generate the surrounding Karagas iron ore, and the hopper part of the grab or continuous unloader will be put into the water with high water content. The part is produced, and then the Caragas iron ore and the water are discharged at the same time, thereby reducing the water content to an area of 23% or less. Further, the control of the water content can be carried out by adding a polymer water absorbing agent (water-absorbent polymer). Since the problem of excess moisture content can be solved in accordance with this order, it is considered to be advantageous for practical work.

In the above, the present invention is described by taking Caragas iron ore as an example, but other ores may be used in the case of new iron ore according to the conditions of the present invention, by the above-mentioned experiments 1 and 2; The subject is implemented with new iron ore and the target value of the above water content can be determined.

Example

The chemical liquid addition is started when the Caragas iron ore is unloaded from the carrier, and when it reaches a region where the water content is too high, the moisture content is 9.6% or more.

As means for confirming the period of reaching the region having the water content of 9.6% or more, it is possible to determine the occurrence of the suspended water generated by the depression after the grab in the grab when the Caragas iron ore is unloaded from the carrier. . that is, The amount of water can be estimated based on the amount of suspended water inflow and the capacity of the grab after the grab is grasped. Alternatively, when the Caragas iron ore is unloaded from the handling vessel, the water content of the Caragas iron ore is changed during the initial unloading, and the sample is taken according to an on-line measuring device such as a neutral moisture meter or by an automatic sampling machine. In the relationship between the change in the amount of water analyzed by the simple moisture measurement in the analysis center and the amount of suspended water in the grab (by visual measurement), it can be estimated whether the unloading from the next carrier will reach the moisture content of 9.6. More than % of the area.

In addition, since the overflow of water from the gushing water is prevented from overflowing from the belt conveyor as much as possible, it is preferable to add the medicine in the bulk cargo from the unloading at the time of reaching the region having a water content of 9.6% or more based on safety considerations.

[Example 1]

The following experiment was carried out by using the first belt conveyor in Fig. 6 as a chemical addition position.

As the unloading of iron ore, when the Caragas iron ore with a water content of 7.9 to 23% is unloaded from the handling vessel, in the conditions shown in Tables 2 and 3 above, under the condition that the modification can be ○ , add liquid medicine separately.

Among them, the drug solution is kurisat C-333L, and the mixed polymer α. In addition, kurisat C-333L and the mixed polymer α are all liquid.

The effect of the addition is to photograph the return side (I) of the belt conveyor shown in Fig. 8 and the joints of the end position of the belt conveyor (II), (III) and (IV) after the unloading is completed, respectively. determination.

As a result of the judgment, the position of a and b in Fig. 6 is produced. In addition to a number of deposits, after the c position (the return side (I) shown in Fig. 8 after the third belt conveyor and the joints at the end position of the belt conveyor (II), (III) and (IV)) No deposits were formed, so that the Caragas iron ore was unloaded.

[Embodiment 2]

The following experiment was carried out on the belt conveyor downstream of the hopper of the first belt conveyor in Fig. 6 as a chemical liquid addition position.

The addition conditions were the same as in Example 1, and the chemical components were also the same. Further, the determination of the effect of addition was also the same as in the first embodiment.

As a result of the determination, a number of deposits are generated at the position a in Fig. 6, and after the b position (the return side (I) and the end position of the belt conveyor shown in Fig. 8 after the second belt conveyor) The joints (II), (III), and (IV) did not produce attachments, so that the Caragas iron ore was unloaded.

Moreover, when the Caragas iron ore was transported in the past, as described above, the Caragas iron ore itself contains a lot of water, and when the cargo is discharged to the land, a lot of water is generated. Therefore, the unloading of iron ore is carried out while intermittently performing the water-suction removal (drainage) operation.

In the case where the unloading efficiency of the iron ore when no water inrush occurs is 100%, the unloading efficiency is reduced to 65% by the conventional unloading method for the drainage operation. However, the above-described Embodiment 2 employs a unloading method suitable for the present invention, thereby achieving an unloading efficiency of about 92%.

In addition, when the rain is heavy, the unloading of the machine is continued, even if it is water. The same is true for the unloading of excessive iron ore.

In the torrential rain, the unloading of the unloader is continued, and the unloading operation progresses. At the stage of reaching the lower part of the second half of the unloading, the iron ore which is in the state of being observed to be gushing water will be in the state of high moisture due to heavy rain. When the cargo is unloaded from the carrier, the second belt conveyor in Fig. 6 is used as a chemical liquid addition position, and an acrylamide-based polymer flocculant is added.

In this case, when the unloading efficiency of iron ore in the case of water inrush due to heavy rain is 100%, the unloading efficiency after the water generation is reduced to 65% by the conventional unloading method of the drainage operation. . However, with the unloading method suitable for the present invention, even if water rushing occurs due to heavy rain, the unloading efficiency of about 90% can be maintained.

[Industrial availability]

The unloading technology of the above-mentioned bulk cargo of the present invention can be applied to the unloading operation of bulk cargo such as gravel, sand, grain, etc., in addition to the exemplified water ore and coal.

7‧‧‧Small condensed particles

8‧‧‧ Large aggregated particles

A‧‧‧ polymer agglutinating agent

B‧‧‧Polymer

P‧‧‧ powder

Wm‧‧‧ water

Claims (16)

The method for unloading and processing water-containing bulk cargo is to use an overhead crane of a bridge crane or an unloader to transport the water-containing bulk cargo containing ore and coal from the cargo ship to the belt conveyor, when suspended in suspension of the powder When the water is generated and contained in the water-containing bulk cargo to increase the moisture content of the water-containing bulk cargo, the above-mentioned water-containing bulk cargo is added as a chemical liquid in the above-mentioned belt conveyor or in the hopper in the above-mentioned bridge crane or unloader. After the agent containing the polymer flocculant as a main component becomes an agglomerate of the water-containing bulk cargo and the suspended water, the aggregate is transported by a belt conveyor. The method for unloading an aqueous bulk cargo according to claim 1, wherein the amount of the chemical liquid added is in the range of 0.1 to 1 mass% with respect to the moisture content of the bulk cargo. The method for unloading an aqueous bulk cargo according to the first aspect of the invention, wherein the amount of the chemical liquid added is in a range of 0.15 to 0.4 mass% with respect to the moisture content of the bulk cargo. The method for unloading an aqueous bulk cargo according to the second aspect of the invention, wherein the amount of the chemical liquid added is in a range of 0.15 to 0.4 mass% with respect to the moisture content of the bulk cargo. The method for unloading an aqueous bulk cargo according to the first aspect of the invention, wherein the bulk cargo, the water immersion and the medicament in the agglomerate of the aqueous bulk cargo are further mixed at a portion of the gap of the belt conveyor. The unloading method of the water-containing bulk cargo according to the second aspect of the patent application, wherein the bulk cargo and the surge in the agglomerate of the water-containing bulk cargo are further Water and chemicals are mixed at the drop portion of the belt conveyor joint. The method for unloading an aqueous bulk cargo according to the third aspect of the invention, wherein the bulk cargo, the water immersion and the medicament in the agglomerate of the water-containing bulk cargo are further mixed in a drop portion of the belt conveyor joint portion. The method of unloading an aqueous bulk cargo according to the fourth aspect of the invention, wherein the bulk cargo, the water immersion and the medicament in the agglomerate of the water-containing bulk cargo are further mixed at a portion of the gap of the belt conveyor. The method for unloading an aqueous bulk cargo according to any one of claims 1 to 8, wherein the above-mentioned agent is added to the belt conveyor in the form of a spread, and the above-mentioned medicament is reached on the belt conveyor after being spread. The portion of the gap at the joint portion of the belt conveyor is again mixed with the agglomerate of the water-containing bulk cargo. The method of unloading an aqueous bulk cargo according to any one of claims 1 to 8, wherein the spraying of the medicament on the belt conveyor is carried out in the form of a mist, and the above-mentioned spraying onto the belt conveyor is performed. The medicine is again mixed with the agglomerates of the water-containing bulk cargo at the portion of the gap at the joint portion of the belt conveyor. The method for unloading an aqueous bulk cargo according to any one of claims 1 to 8, wherein the moisture content of the aqueous bulk cargo is controlled to be less than 23 mass%. The method for unloading an aqueous bulk cargo according to claim 9 wherein the moisture content of the aqueous bulk cargo is controlled to be less than 23 mass%. For example, the unloading party of the waterborne bulk cargo in the scope of claim 10 The method wherein the moisture content of the aqueous bulk cargo is controlled to be less than 23 mass%. The method for unloading an aqueous bulk cargo according to claim 11, wherein the control of the moisture content of the aqueous bulk cargo is carried out by adding a polymeric water absorbing agent. The method for unloading an aqueous bulk cargo according to claim 12, wherein the control of the moisture content of the aqueous bulk cargo is carried out by adding a polymeric water absorbing agent. The method for unloading an aqueous bulk cargo according to claim 13 wherein the moisture content of the aqueous bulk cargo is controlled by adding a polymeric water absorbing agent.