AU2019342365A1 - Article movement method, ore transportation method, and ore transportation device - Google Patents

Description

DESCRIPTION

Title of Invention: METHOD OF MOVING GOODS, METHOD OF TRANSPORTING ORE, AND TRANSPORT DEVICE OF ORE Technical Field [0001] The present disclosure relates to a method of moving a goods, a method of transporting ore, and a transport device of ore.

Background Art [0002] In a mining site, an operation is repeated including loading mined ore on the cargo bed of a vehicle such as dump truck and transporting the mined ore, and unloading the ore from the cargo bed at a stock yard.

[0003] The operation of unloading ore from a cargo bed is usually performed by tilting the cargo bed from a falling down position to a rising position to allow the ore to slide down (chuting). On this occasion, the whole amount of the ore loaded may not be allowed to slide down, so that a part of the ore tends to remain on the cargo bed and tends to be left behind. In particular, the ore tends to adhere to comers of the cargo bed and tends to remain there. The occurrence of ore left behind causes problems such as decrease in the amount of ore unloaded from the cargo bed, increase in the fuel cost of the vehicle returning to the mining site caused by the mass of the ore left behind thereon, and decrease in the amount of ore to be loaded on the cargo bed at the mining site.

[0004] The occurrence of ore left behind tends to occur particularly in the case of ore containing clay, because the ore easily adheres to the cargo bed through the clay Also, the amount of ore left behind tends

FP19-0170-00 to increase with the count of repetitions of loading/unloading of ore. However, performing an operation to unload the ore left behind by human power on every occasion of unloading for reduction of the amount of ore left behind is inefficient.

[0005] As a method for remedying the problem of leaving behind, installing a resin liner on the surface (inner wall) of the cargo bed of a vehicle to improve the slidability of a load during unloading is known. Also, in Patent Literature 1, a method for dropping a large amount of load during unloading is proposed in which a liner slidable during unloading is installed on a cargo bed, and by using the sliding force of the liner during unloading, extension of a flexible body installed at a site to which the load easily adheres suppresses adhesion of a load above the flexible body.

Citation List

Patent Literature [0006] Patent Literature 1: Japanese Unexamined Patent Application Publication No. 2016-2953

Summary of Invention

Technical Problem [0007] However, since the method of installing a resin liner on a cargo bed requires the liner to be fixed to the cargo bed with bolts, there exist problems that the installation operation is troublesome and the installation at the comer of the cargo bed is hardly performed. Also, since the shape of a cargo bed is various, the liner fitted to the shape requires to be searched for or newly made, so that there exists a problem that the installation is impossible when a suitable liner is not present and

FP19-0170-00 cannot be made. Incidentally, in the case where a liner is newly made, extraordinary cost is required. Regarding the cargo bed described in Patent Literature 1, there exist problems that the installation operation of the liner and the flexible body is troublesome, and the installation is impossible depending on the shape of the cargo bed.

[0008] Also, a resin liner may be subjected to damages such as destruction, cracks and chipping resulting from strong impact during loading of ore in some cases. In extreme cases, the liner is damaged in only one transport. At every occurrence of the damages, the liner is required to be repaired or replaced, resulting in reduction in efficiency of the transport operation and increase in cost. Further, breakage of the liner allows a large amount of resin to be mixed with ore. Removing the resin is not easy, resulting in reduction in efficiency of the transport operation and increase in cost after all. Furthermore, installation of the liner results in increase in the weight of the cargo bed as much as the weight of the liner and reduction in the carrying capacity on the cargo bed in proportion to the thickness of the liner, so that reduction in the amount of transport and increase in the fuel cost of a vehicle are unavoidable. Development of a convenient method for inhibiting the ore from being left behind on a cargo bed without using the liner is, therefore, required.

[0009] In a stock yard, ore is moved by using a belt conveyor, a transport chute and the like. The transport chute is a facility having a tilted surface along which the ore is dropped. When the ore is dropped by using a transport chute, a part of the ore may adhere to the tilted surface to remain without dropping, or the dropping speed may be

FP19-0170-00 reduced due to poor slipperiness. Development of a method for easily dropping ore without adherence to a transport chute is, therefore, required.

[0010] As a moving method by sliding a goods on a loading surface, a method of easily moving a goods not only applicable to transport of ore, capable of inhibiting the goods from adhering to and remaining on the loading surface, is required to be developed.

[0011] In view of the problems of the conventional art, it is an object of the present disclosure to provide a method of moving a goods, capable of easily moving the goods by sliding the goods on a loading surface without causing the goods to remain on the loading surface by adhesion thereto. Another object of the present disclosure is to provide a method of transporting ore, capable of inhibiting the ore from being left behind on a cargo bed. Further another object of the present disclosure is to provide a method of transporting ore and a transport device of ore, capable of inhibiting the ore from adhering to a loading surface.

Solution to Problem [0012] In order to achieve the object, in an aspect of the present disclosure, provided is a method of moving a goods on a loading surface, the loading surface comprising a coating layer containing a cleavable material, wherein the goods is allowed to slide down together with a part of the cleavable material by tilting the loading surface and cleaving a part of the cleavable material in contact with the goods.

[0013] According to the moving method, the loading surface comprises a coating layer containing a cleavable material, and by tilting the loading surface to allow the goods to slide down on the loading surface

FP19-0170-00 together with a part of the cleavable material, the goods can be easily moved without remaining on the loading surface by adhesion thereto. The moving method uses the cleavability of a cleavable material and use of the properties allows various goods including ore to be easily moved. Further, according to the moving method, even a goods having adhesiveness is allowed to slide down together with the cleavable material present on the loading surface adhering thereto, so that the good is inhibited from adhering to and remaining on the loading surface. Further, since cleavage of the cleavable material is further facilitated with increase in the stress or impact applied to the loading surface, the effect of the moving method can be enhanced with increase in the mass of the goods.

[0014] In the moving method, the cleavable material may contain graphite. Graphite has excellent slidability and high cleavability resulting from sliding between graphene sheets in graphite and can be therefore suitably used in the moving method for allowing a goods to slide down by taking advantage of cleavability.

[0015] In the moving method, the coating layer may further contain a binder. Further, the binder may contain a water-soluble resin. Containing a binder in the coating layer allows the adhesive strength of the coating layer to a loading surface can be enhanced, so that detachment of the coating layer can be inhibited. Even in that case, the cleavability of the cleavable material is not impaired, so that a goods is allowed to slide down easily by tilting the loading surface.

[0016] In the moving method, the loading surface may be tilted by 1 to 90°. By tilting the loading surface by the angle described above, a

FP19-0170-00 goods can be more easily moved without adhering to and remaining on the loading surface.

[0017] In the transporting method, the goods may include ore. Also, the ore may include iron ore and clay. The moving method is suitable for moving ore on a loading surface. Clay may be mixed into mined ore in some cases. The clay easily adheres to the loading surface and tends to cause a goods to be left behind on a cargo bed or tends to cause adhesion to a transport chute. According to the moving method, the ore is allowed to slide down together with a cleavable material even when the clay contained in the ore adheres to the loading surface, so that the ore is inhibited from adhering to a cargo bed or a transport chute and remaining there.

[0018] In the moving method, the water content of the goods may be 0 to 50 mass%. Although a goods with a water content of particularly 15 to 35 mass% tends to adhere to a loading surface, the goods with a water content in the range is allowed to easily slide down together with a cleavable material present on the loading surface by the moving method.

[0019] In the moving method, the loading surface may be the surface of a cargo bed of a vehicle. Alternatively, the loading surface may be the tilted surface of a transport chute. The moving method is a method suitable for unloading a goods from the cargo bed of a vehicle and for dropping a goods along the tilted surface of a transport chute.

[0020] The present disclosure also provides a method of transporting ore, wherein a coating layer containing a cleavable material is formed on at least a part of the surface of the cargo bed of a vehicle for

FP19-0170-00 transporting ore, the ore is loaded on the cargo bed and transported, and then the ore is allowed to slide down together with a part of the cleavable material by tilting the cargo bed at a transport destination and cleaving a part of the cleavable material in contact with the ore. According to the transport method, leaving ore behind on the cargo bed is inhibited, so that the transport operation of ore can be efficiently performed.

[0021] The present disclosure also provides a method of transporting ore, comprising a step of allowing ore on a loading surface having a coating layer containing a cleavable material in a tilted state, to slide down together with a part of the cleavable material by cleaving a part of the cleavable material in contact with the ore. According to the transport method, adhesion of ore to the loading surface is inhibited, so that the transport operation of ore can be efficiently performed.

[0022] The present disclosure also provides a transport device of ore, comprising a loading surface comprising a coating layer containing a cleavable material, wherein the loading surface, in a tilted state, is a surface on which the ore is allowed to slide down together with a part of the cleavable material by cleaving a part of the cleavable material in contact with the ore. According to the transport device of ore, adhesion of ore to the loading surface is inhibited, so that the transport operation of ore can be efficiently performed.

[0023] The present disclosure also provides a coating method of the cargo bed of a vehicle for transporting ore, comprising a coating step of coating at least a part of the surface of the cargo bed with a coating composition containing graphite and a solvent, and a drying step of

FP19-0170-00 removing the solvent.

[0024] According to the coating method, coating the cargo bed with a coating composition containing graphite and a solvent allows the slidability of the surface of the cargo bed to be drastically improved, so that allowing the ore to slide down can be easily performed in unloading of the ore from the cargo bed by tilting the cargo bed. Also, clay is mixed into mined ore in some cases. Although clay easily adheres to the surface of a cargo bed and tends to cause ore to be left behind, coating of the cargo bed applied by the coating method allows the ore to slide down easily even when clay is contained in the ore. The reason can be that graphite contained in the coating composition has excellent slidability, and in addition to that, a part of graphite is cleaved to slide down together with the ore, when the ore is allowed to slide down from the cargo bed. The phenomenon is caused by sliding between graphene sheets in graphite. According to the coating method, the ore can be inhibited from being left behind on the cargo bed and efficiency of the transport operation can be enhanced.

[0025] Further, the coating method allows a cargo bed to be easily coated by applying a coating composition to the surface of the cargo bed by any means and drying the composition, so that the slidability of the cargo bed can be very easily enhanced in comparison with the case of installing a liner on the cargo bed. Furthermore, even when the coating applied to the cargo bed peels off, coating application may be easily performed again or partial repair may be performed, so that easy maintenance can be achieved without troublesome work or waste involved in the case of replacing a damaged liner.

FP19-0170-00 [0026] The coating composition may further contain a binder. The adhesion strength of graphite to the surface of a cargo bed can be thereby enhanced, so that the coating applied to the cargo bed is inhibited from peeling off. Incidentally, even in that case, the cleavability of graphite is not impaired, so that ore is allowed to easily slide down when unloaded from the cargo bed by tilting the cargo bed.

[0027] The binder may contain a water-soluble resin. Also, the solvent may contain water. The solvent may further contain alcohol. In the case of a binder containing a water-soluble resin, water can be easily used as solvent. In the case of using water as solvent, coating operation can be easily performed. In the case of a solvent containing alcohol, the drying step tends to be performed in a short time.

[0028] The coating may be performed by spray application. By spray application, coating can be efficiently and uniformly performed in a short time.

[0029] The ore may include iron ore and clay As a coating method of the cargo bed of a vehicle for transporting such ore, the method of the present disclosure is particularly effective.

[0030] The drying step may be performed in 20 minutes or less by means including heating and/or blowing air. By using means including heating and/or blowing air, removal of the solvent in the coating composition can be efficiently performed in a short time, so that the drying step can be done within 20 minutes.

[0031] The coating method described above may further comprise a polishing step of polishing the surface of a first coating layer formed at least a part of the surface of the cargo bed after passing through the

FP19-0170-00 coating step and the drying step, a second coating step of coating at least a part of the surface of the polished first coating layer with a second coating composition containing graphite and a solvent, and a second drying step of removing the solvent in the second coating composition. [0032] As described above, coating in two steps allows a smoother coating layer to be more thickly and uniformly formed. In unloading ore from a cargo bed by tilting the cargo bed, the ore is therefore allowed to more easily slide down.

[0033] In the coating method of the present disclosure, after the elapse of 12 hours to 14 days since the cargo bed is coated by the coating method described above, the cargo bed may be coated again by the coating method described above. The coating operation may be repeated every 12 hours to 14 days. Coating applications at intervals of 12 hours to 14 days allows the excellent slidability of the surface of the cargo bed to be continuously maintained.

[0034] The present disclosure also provides a coating composition comprising a binder containing a water-soluble resin, graphite and a solvent including water.

[0035] The present disclosure also provides a coating composition comprising graphite and a solvent, for use in coating of the cargo bed of a vehicle for transporting ore.

[0036] According to the coating composition, a coating layer can be formed on the surface of the cargo bed, capable of drastically improving the slidability of the surface of a cargo bed, allowing the ore easily slide down when unloaded from the cargo bed by tilting the cargo bed.

[0037] The present disclosure also provides a cargo bed having at least

FP19-0170-00 a part of the surface coated by the coating method of the present disclosure. The cargo bed is excellent in slidability of the surface, and in unloading ore from the cargo bed by tilting the cargo bed, the ore is allowed to easily slide down.

[0038] The present disclosure further provides a method of transporting ore, wherein at least a part of the surface of the cargo bed of a vehicle for transporting ore is coated by the coating method of the present disclosure, the ore is loaded on the cargo bed and transported, and then the ore is allowed to slide down together with a part of the graphite from the cargo bed by tilting the cargo bed at the transport destination. According to the transport method, leaving ore behind on the cargo bed is inhibited, so that the transport operation of ore can be efficiently performed.

Advantageous Effects of Invention [0039] According to the present disclosure, a method of moving a goods can be provided, capable of easily moving the goods by sliding the goods on a loading surface without causing the goods to remain on the loading surface by adhesion thereto. Also, according to the present disclosure, a method of transporting ore capable of inhibiting the ore from being left behind on a cargo bed can be provided. Also, according to the present disclosure, a method of transporting ore and a transport device of ore capable of inhibiting the ore from adhering to a loading surface can be provided. Also, according to the present disclosure, a coating method of a cargo bed capable of inhibiting the ore from being left behind on the cargo bed can be provided. Further, according to the present disclosure, a coating composition to form a

FP19-0170-00 coating layer capable of inhibiting the ore from being left behind on a cargo bed can be provided.

Brief Description of Drawings [0040] [Figure 1] Figure 1 is a schematic diagram showing an embodiment of a method of moving a goods.

[Figure 2] Figure 2 is a schematic diagram showing an embodiment of a coating method.

[Figure 3] Figure 3 is a schematic diagram illustrating a testing method for chuting.

[Figure 4] Figure 4 is a schematic diagram illustrating an evaluation method of slidability.

[Figure 5] Figure 5 is a schematic diagram showing the temporal change in friction force f.

[Figure 6] Figure 6 is a graph showing the temporal change in normalized friction coefficient measured on coating test pieces in Example 1 and Comparative Example 1.

Description of Embodiments [0041] Preferred embodiments of the present disclosure are described in detail as follows with reference to drawing in some cases. Incidentally, the same or equivalent part is represented by the same symbol in the drawing, and redundant description is omitted. Also, the dimensional proportion is not limited to the illustrated proportion.

[0042] The term layer in the present specification includes not only a structure formed on a whole surface but also a structure formed on a part of the surface, when observed in a plan view. The term step in the present specification includes not only an independent step but also

FP19-0170-00 a step indistinguishable from another step, so long as the expected effect of the step is achieved. Also, a numerical range represented by using to represents a range including the numerical values described at the front or rear of to as the minimum value or the maximum value.

[0043] Further, in the case where a plurality of materials corresponds to each of the components in the composition, the content of each of the components in the present specification refers to the total amount of the materials present in the composition unless otherwise noted. The exemplified materials may be singly used or may be used in combination of two or more unless otherwise noted.

[0044] Also, in the numerical range stepwisely described in the present specification, an upper limit or a lower limit of the numerical range in a step may be replaced with an upper limit or a lower limit of the numerical range in another step. Also, an upper limit or a lower limit in the numerical range described in the present specification may be replaced with the values shown in Examples.

[0045] <Method of moving goods>

The method of moving a goods of the present embodiment is a method for moving a goods on a loading surface, the loading surface comprising a coating layer containing a cleavable material, wherein the goods is allowed to slide down together with a part of the cleavable material by tilting the loading surface and cleaving a part of the cleavable material in contact with the goods.

[0046] Figure 1 is a schematic diagram (cross-sectional view) showing an embodiment of a method of moving a goods. As shown in Figure 1, in the moving method of the present embodiment, a goods 8 is placed

FP19-0170-00 on a loading surface 6a as the surface of a coating layer 6 containing a cleavable material 2 and a binder 4, and the loading surface 6a is tilted by a predetermined tilt angle 0 so as to allow the goods 8 to slide down together with a cleaved material 3 as a part of a cleavable material 2 by cleaving a part of the cleavable material 2 in contact with the goods 8. The goods 8 can be thereby easily moved without adhering to and remaining on the loading surface 6a. Incidentally, in Figure 1, the coating layer 6 is formed on the surface of a foundation component 7.

[0047] Here, the loading surface 6a may be tilted after goods 8 is loaded thereon, or may be tilted in advance and then the goods 8 may be loaded thereon.

[0048] The tilt angle 0 is optionally determined, and adjusted to an angle at which the goods 8 is allowed to slide down depending on the composition of the coating layer 6, the surface state of the loading surface 6a, and the material, the shape, the mass and the water content of the goods 8. The tilt angle 0 is 1 to 90°, and may be 5 to 80°, or 10 to 60°.

[0049] The water content of the goods 8 is not particularly limited, and may be 0 to 50 mass%, 1 to 40 mass%, or 15 to 35 mass%. Usually, moving the goods 8 is more easily performed with decrease in the water content, and the goods 8 tends to adhere to the loading surface 6a with increase in the water content. According to the moving method of the present embodiment, even when the water content of the goods 8 is in a state most easily adhering to the loading surface 6a, sliding down together with the cleavable material 2 present in the loading surface 6a is easily achieved. Incidentally, the water content of the goods 8 can

FP19-0170-00 be determined from the change in mass before and after heating, when the goods 8 is dried by heating at 120° or more for 1 hour or more. [0050] In the moving method of the present embodiment, cleaving of the cleavable material is more facilitated with increase in the stress or impact applied to the loading surface 6a, so that the goods 8 can be easily moved. The stress applied to the loading surface 6a may be therefore 0.5 kPa or more, 1 kPa or more, or 3 kPa or more, as the stress applied to the loading surface 6a in a horizontal state (tilt angle 0=0°) loaded with the goods 8.

[0051] The coating layer 6 may be formed on any component (foundation component 7). For example, the coating layer 6 may be formed on the surface of the cargo bed of a vehicle, the tilted surface of a transport chute, or the like.

[0052] The coating layer 6 may be formed from a coating composition. The coating composition is described as follows.

[0053] <Coating composition>

A coating composition contains at least a cleavable material and a solvent. The coating composition may further contain a binder on an as needed basis. The coating composition may further contain an inorganic filler, a pH adjuster, an elastomer, a wetting agent, and other various additives on an as needed basis. Each of the components is described as follows.

[0054] (Cleavable material)

The cleavable material is not particularly limited so long as the material has cleavability. Here, cleavability refers to properties of layered particles bonded with weak bonding strength between crystal

FP19-0170-00 planes, the particles being easily cracked along the crystal plane. Examples of the cleavable material include graphite, mica, talc, hexagonal boron nitride (h-BN), and molybdenum sulfide. Among them, graphite is preferred, due to having easy cleavability even with a low stress, allowing a goods to be more easily moved.

[0055] The graphite is not particularly limited, and natural graphite and synthetic graphite may be used. Examples of the natural graphite include flake graphite and aggregate graphite. Among them, flake graphite is particularly preferred because a goods can be more easily moved.

[0056] The average particle diameter of the cleavable material is not particularly limited, preferably 0.1 to 50 pm, more preferably 1 to 20 pm, still more preferably 2 to 15 pm. With an average particle diameter of cleavable material of 0.1 pm or more, cleaving of particles of cleavable material oriented in parallel with the surface direction of the coating layer 6 (shear peeling between crystal layers) easily occur, so that the goods 8 tends to be more easily moved. With an average particle diameter of 50 pm or less, occurrence of irregularities on the surface of the coating layer 6 to block moving of the goods 8 tends to be inhibited. The average particle diameter of the cleavable material can be measured by a commonly used method for measuring particle size distribution such as laser diffraction/scattering method and image analysis method.

[0057] The content of the cleavable material in the coating composition is preferably 50 mass% or more, more preferably 60 to 98 mass%, still more preferably 80 to 95 mass% based on the total content of the solid

FP19-0170-00 content of the coating composition. With a content of the cleavable material of 50 mass% or more, the slidability of the loading surface 6a tends to be enhanced, and with a content of 98 mass% or less, a sufficient amount of the binder resin for formation of the coating layer 6 is secured, so that coating strength sufficient for practical use tends to be easily maintained. Incidentally, in the coating layer 6, the preferred range of the content of the cleavable material based on the total amount of the coating layer 6 is the same as described above.

[0058] (Binder)

A binder is not particularly limited, and, for example, a water-soluble resin and an emulsion resin may be used. Among them, use of a water-soluble resin is preferred, because water can be easily used as solvent. Use of a binder allows the solid content contained in the coating composition such as cleavable material to be bonded together and the bonding strength between the formed coating layer 6 and the foundation component thereof to be enhanced.

[0059] Examples of the water-soluble resin include celluloses such as carboxymethyl cellulose and methyl cellulose; polyvinyl alcohol; polycarboxylic acids such as polyacrylic acid; polyacrylamide; and poly(alkylene oxide) such as poly(ethylene oxide). Among them, from the viewpoint of dispersing the solid content such as cleavable material into a water-containing solvent and preventing the water-soluble resin from re-dissolving into water after drying of the coating, carboxymethyl cellulose, particularly ammonium carboxymethyl cellulose, is preferred. [0060] In the case of using a water-soluble resin as binder, the 1% viscosity (viscosity of aqueous solution dissolving 1 mass% of

FP19-0170-00 water-soluble resin in water) of the water-soluble resin at 25°C is preferably 1 to 300 mPa-s, more preferably 10 to 50 mPa-s. With a 1% viscosity of 1 mPa-s or more, the resin easily adheres between solid particles such as the cleavable material and inorganic filler, tending to function as binder. With a 300 mPa-s or less, the coating composition can be made without excessive increase in viscosity, so that stirring and mixing tend to be easily performed. Incidentally, the 1% viscosity can be measured by a commonly used rotary viscometer such as B-type viscometer, and in the present specification, the value is measured by using a B-type viscometer manufactured by Tokimec, Inc., with use of a BM-type rotor at a rotation speed of 60 rpm.

[0061] In the case where the coating composition contains a binder, the content thereof is preferably 2 to 40 mass%, more preferably 2 to 20 mass%, still more preferably 5 to 15 mass%, based on the total solid content in the coating composition. With a binder content of 2 mass% or more, a sufficient amount of the binder resin for formation of the coating layer 6 is secured, so that coating strength sufficient for practical use tends to be maintained, and with 40 mass% or less, the slidability of the loading surface 6a tends to be further improved. Incidentally, in the coating layer 6, the preferred range of the binder content based on the total amount of the coating layer 6 is the same as described above. [0062] (Solvent)

Although the solvent is not particularly limited, it is preferable to use a solvent which allows the cleavable material to be dispersed, and, in the case of using a binder, a solvent capable of dissolving the binder. Examples of the solvent include water, alcohol and ketone.

FP19-0170-00

Examples of the alcohol include ethanol, methanol, isopropyl alcohol and butanol. Examples of the ketone include acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone. From the viewpoint of dispersing and dissolving the water-soluble resin, it is preferable that the solvent be a polar solvent. In particular, it is preferable that the solvent contain water from the viewpoint of reduction in the risk of firing, prevention of environmental impact, and handling easiness in transport and storage, and it is more preferable that the solvent contain water and alcohol from the viewpoint of compatibility in solubility of the resin and quick drying.

[0063] The boiling point of the solvent is preferably 50 to 100°C, more preferably 70 to 90°C. With a boiling point of 50°C or more, the solvent can be inhibited from volatizing during application of the coating composition, so that the working efficiency tends to be improved, and with a boiling point of 100°C or less, the solvent tends to be removed in a shorter time in the drying step.

[0064] The content of the solvent in the coating composition is preferably 5 to 90 mass%, more preferably 50 to 90 mass%, still more preferably 70 to 85 mass%, based on the total amount of the coating composition.

[0065] Also, the content of the solvent in the coating composition may be appropriately adjusted such that the coating composition has a desired viscosity depending on the application method in the coating step. For example, in the case where the coating composition is applied by spraying, the viscosity of the coating composition is adjusted to preferably 0.01 to 3 Pa-s, more preferably 0.04 to 0.5 Pa-s. In the

FP19-0170-00 case where the coating composition is applied by hand using a brush or the like, the viscosity of the coating composition is adjusted to preferably 0.1 to 5 Pa-s, more preferably 0.3 to 3 Pa-s. In the case where the coating composition is applied by an applicator such as a bar coater and a roll coater, the viscosity of the coating composition is adjusted to preferably 0.2 to 2 Pa-s, more preferably 0.4 to 1 Pa-s.

[0066] (Inorganic filler)

Examples of the inorganic filler include carbon black, silica, calcium carbonate, aluminum oxide, titanium oxide, chromium oxide, iron oxide, a phosphate and a molybdate. Examples of the silica include colloidal silica from the viewpoint of dispersibility and viscosity adjustment. Use of inorganic filler allows various properties such as viscosity, coatability, hardness and stretchability of coating, and corrosion resistance to be adjusted.

[0067] The average particle diameter of the inorganic filler is not particularly limited, and preferably 0.01 to 10 pm, more preferably 0.03 to 5 pm. With an average particle diameter of the inorganic filler of 0.01 pm or more, the viscosity increase of the coating composition caused by the inorganic filler in production and handling tends to be within an acceptable range, and with an average particle diameter of 10 pm or less, precipitation of the inorganic filler in the coating composition and the surface roughness of the coating layer 6 tend to be within an acceptable range. The average particle diameter of the inorganic filler can be measured by a commonly used method for measuring particle size distribution such as laser diffraction/scattering method, image analysis method, and dynamic light scattering method

FP19-0170-00 (DLS).

[0068] In the case where the coating composition contains an inorganic filler, the content thereof is preferably 1 to 40 mass%, more preferably 2 to 25 mass%, based on the total solid content of the coating composition. With an inorganic filler content of 1 mass% or more, the viscosity of the coating composition tends to increase, and with a content of 40 mass% or less, increase in the surface roughness and reduction in the slidability of the coating layer tend to be suppressed. Incidentally, in the coating layer 6, the preferred range of the inorganic filler content based on the total amount of the coating layer 6 is the same as described above.

[0069] (pH Adjuster)

Examples of the pH adjuster include aqueous ammonia and silicates. Among them, use of aqueous ammonia is preferred due to easiness in discharging to the outside by volatilization in the process of drying the coating. By using a pH adjuster, the coating composition can be imparted with antiseptic property and dispersion stability of the solid content.

[0070] In the case where the coating composition contains a pH adjuster, the content thereof is preferably 0.02 to 2 mass%, more preferably 0.05 to 1 mass%, still more preferably 0.1 to 0.5 mass%, based on the total content of the coating composition. With a pH adjuster content of 0.02 mass% or more, the dispersion stability and the antiseptic property tend to be stably imparted, and with a content of 2 mass% or less, reduction in durability of the coating caused by the excessive pH adjuster remaining in the coating tends to be inhibited.

FP19-0170-00 [0071] (Elastomer)

Examples of the elastomer include styrene-butadiene rubber, silicone rubber, and acryl rubber. Among them, use of styrene-butadiene rubber is preferred from the viewpoint of dispersibility into the coating composition. By using an elastomer, film strength of the coating can be improved.

[0072] In the case where the coating composition contains an elastomer, the content thereof is preferably 0.5 to 15 mass%, more preferably 1 to 10 mass%, still more preferably 2 to 8 mass%, based on the total solid content in the coating composition. With an elastomer content of 0.5 mass% or more, the film strength of the coating layer 6 tends to be improved, and with a content of 15 mass% or less, reduction in slidability of the coating layer 6 tends to be suppressed. Incidentally, in the coating layer 6, the preferred range of the elastomer content based on the total amount of the coating layer 6 is the same as described above.

[0073] (Wetting agent)

Examples of the wetting agent include a nonionic surfactant, an anionic surfactant, and a cationic surfactant. By using a wetting agent, the wettability to the surface of the material to be coated such as metal is improved, so that occurrence of dents and repelling is inhibited to form an excellent coating film.

[0074] Examples of the nonionic surfactant include an acetylene glycol surfactant, an acetylene glycol surfactant with addition of ethylene glycol, and a silicone dispersant.

[0075] Examples of the cationic surfactant include quaternary

FP19-0170-00 ammonium salts and alkylamine salts.

[0076] Examples of the anionic surfactant include carboxylates, sulfonates, sulfate esters and phosphate esters.

[0077] Among the wetting agents described above, use of a nonionic surfactant is preferred from the viewpoints of less interaction with other water-soluble components and suppression of foaming.

[0078] In the case where the coating composition contains a wetting agent, the content thereof is preferably 0.01 to 1 mass%, more preferably 0.05 to 0.5 mass%, still more preferably 0.1 to 0.3 mass%, based on the total amount of the coating composition. With a wetting agent content of 0.01 mass% or more, the effect for improving wettability tends to be stably obtained, and with a content of 1 mass% or less, conspicuous foaming caused by excessive addition tends to be suppressed. Incidentally, even with further increase in the amount of wetting agent exceeding 1 mass%, the further improvement in wettability tends to be difficult.

[0079] (Other additives)

The coating composition may further contain additives other than the components described above. Examples of the other components include a plasticizer, a dispersant, a thickener, an anti-settling agent, a defoaming agent, an anti-sagging agent, a levelling agent, an anti-corrosive agent, and a water repellent.

[0080] <Coating method>

Figure 2 is a schematic diagram showing an embodiment of a coating method for forming a coating layer from the coating composition. Figure 2 shows a method for coating the surface of the

FP19-0170-00 cargo bed of a vehicle for transporting ore by spray application.

[0081] In the coating method shown in Figure 2, first, a coating composition containing a cleavable material and a solvent is applied to at least a part of the surface of the cargo bed 12 of a dump truck 10 for transporting ore by spray application using an air spray 22 as shown in Figure 2 (a), so that a coating film 14 is formed (coating step). Subsequently, as shown in Figure 2 (b), through drying by heat using a heating lamp 24, the solvent is removed from the coating film 14 (drying step). The solvent is thereby removed from the coating film 14, so that a coating layer 6 containing a cleavable material is formed as shown in Figure 2 (c). In the coating step and the drying step, by moving the dump truck 10 in a predetermined direction relative to the air spray 22 or the heating lamp 24, or by moving the air spray 22 or the heating lamp 24 in a predetermined direction relative to the dump truck 10, the coating layer 6 may be formed at a desired place in the cargo bed 12. The coating layer 6 may be formed on the entire inner wall of the cargo bed 12. The coating layer 6 may be formed on the side wall surface of the cargo bed 12, which is not shown in Figure 2. Then, mined ore is loaded on the cargo bed 12 of a dump truck 10 having the coating layer 6 formed thereon, the ore is transported to a predetermined place in a stock yard or the like, and the cargo bed 12 is then tilted at the transport destination to allow the ore to slide down from the cargo bed 12. On this occasion, due to the coating layer 6 formed on the surface of the cargo bed 12, the ore is allowed to easily slide down, so that the ore can be inhibited from being left behind on the cargo bed 12. Incidentally, the term ore in the present specification is not limited to

FP19-0170-00 the mined ore as it is, and includes, for example, ore after passing through mining, transporting and processing such as classification and refining.

[0082] (Coating step)

In the coating step, at least a part of the surface of the cargo bed 12 is coated with the coating composition described above. Examples of the coating method include, in addition to the application method by spraying shown in Figure 2 (a), an application method by hand using a brush or the like, and an application method by an applicator such as a bar coater and a roll coater. Among them, an application method by spraying is preferred, allowing the coating to be uniformly applied in a short time in an efficient manner. These application methods may be used in combination of two or more.

[0083] By performing the coating step, a coating film 14 made of the coating composition can be formed on at least a part of the surface of the cargo bed 12.

[0084] (Drying step)

Since the coating film 14 formed in the coating step contains a solvent, the solvent is removed from the coating film 14 by performing a drying step, so that a coating layer 6 is formed. Examples of the method for removing the solvent include, in addition to the method for drying by heat using the heating lamp 24 shown in Figure 2 (b), a method of blowing air to the coating film 14 by a blower, a method of standing still at normal temperature for natural drying, a method of heating a foundation (object to be coated) from below, and a method of sunlight or floodlight irradiation. Among them, a method including

FP19-0170-00 heating and/or blowing air is preferred, allowing the solvent in the coating film 14 to be efficiently and sufficiently removed in a short time. These drying methods may be used in combination of two or more.

[0085] In the drying by heat, the heating temperature is set at preferably 30 to 180°C, more preferably 80 to 150°C. By setting the heating temperature at 80°C or more, the solvent in the coating film 14 tends to be efficiently and sufficiently removed in a short time, and by setting at 150°C or less, the rapid volatilization of the solvent is inhibited, so that a coating layer 6 having a smoother surface tends to be formed.

[0086] The drying time in the drying step may be 20 minutes or less. In order to reduce the drying time, it is preferable that drying be performed by means including heating and/or blowing air, more preferable that drying be performed by means including heating, still more preferable that drying be performed by means including both of heating and blowing air.

[0087] In the case where the drying step is performed by natural dying, the drying time may be 0.2 hours or more, or may be 0.2 to 1 hour.

[0088] The thickness of the coating layer 6 formed by passing through the drying step is preferably 5 to 300 pm, more preferably 10 to 100 pm. With a thickness of 10 pm or more, ore is allowed to easily slide down from the cargo bed 12 and the sliding effect tends to be maintained for a longer period, and with a thickness of 100 pm or less, not only the coating step and the drying step can be performed in a shorter time and the coating layer 6 having a smoother surface can be formed, but also increase in the mass of the cargo bed 12 and decrease

FP19-0170-00 in the capacity of the cargo bed 12 tend to be suppressed.

[0089] The coating layer 6 formed through a drying step has a mass per unit area of preferably 7.5 to 600 g/m², more preferably 15 to 200 g/m². With a mass per unit area of 15 g/m² or more, ore is allowed to easily slide down from the cargo bed 12 and the sliding effect tends to be maintained for a longer period, and with a mass per unit area of 200 g/m² or less, not only the coating step and the drying step can be performed in a shorter time and a coating layer 6 having a smoother surface can be formed, but also increase in the mass of the cargo bed 12 and decrease in the capacity of the cargo bed 12 tend to be suppressed.

[0090] (Polishing step)

The coating method of the present embodiment may further include a polishing step of polishing the surface of the coating layer 6 formed through the drying step. Polishing can be performed by using a cloth made of natural fiber or synthetic fiber, a fabric, a brush, or a sponge. By polishing the surface of the coating layer 6, the surface is further smoothed, so that ore is allowed to more easily slide down from the cargo bed 12.

[0091] (Second coating step and second drying step)

The coating method of the present embodiment may further include a second coating step of coating at least a part of the surface of the coating layer formed after the drying step or the polishing step (hereinafter referred to as first coating layer) with a second coating composition containing a cleavable material and a solvent, and a second drying step of removing the solvent in the second coating composition. [0092] The second coating step and the second drying step may be

FP19-0170-00 performed by the same manner as in the coating step and the drying step of forming the first coating layer, or may be performed by a different method. As the second coating composition, the same composition as the coating composition for forming the first coating layer may be used, or a different composition may be used.

[0093] By performing the second coating step and the second drying step, a second coating layer is formed on the first coating layer, so that a thicker coating layer can be formed in a state having a smoother surface. Also, by making a laminate structure of the first coating layer and the second coating layer, the durability and the impact resistance can be further improved.

[0094] <Maintenance method>

After the elapse of 12 hours to 14 days since the cargo bed is coated by the coating method of the present embodiment, the cargo bed may be coated again by the coating method of the present embodiment. Coating the cargo bed by the coating method of the present embodiment may be repeated every 12 hours to 14 days. Coating application at intervals of 12 hours to 14 days allows the excellent slidability of the cargo bed surface to be continuously maintained. The periodic coating application at certain intervals makes the maintenance of the cargo bed easy. The coating method of the present embodiment can be performed in a shorter time at lower cost in comparison with the case of using a liner and even when a coating layer which has been formed in the past remains, the coating layer can be overcoated with a new coating layer, so that periodic coating can be easily applied. Incidentally, prior to repeating coating application, the surface of the coating layer which

FP19-0170-00 has been formed in the past may be subjected to washing and/or polishing or the like.

[0095] In the case of using graphite as the cleavable material, the coating layer is in black color, which is different from the color of the cargo bed surface before formation of the coating layer. Coating application may be therefore repeated at the timing when the color of the coating layer becomes pale and the color of the cargo bed surface begins to be visible. Since the timing for maintenance can be determined by color as described above, the maintenance of the cargo bed can be made easy.

[0096] <Method for repairing and flattening cargo bed surface>

By applying the coating method of the present embodiment to a cargo bed having damages such as scratches or abrasion in the surface, a smooth coating layer can be formed to cover the damages, so that the method can be employed for repairing or flattening the cargo bed surface. In the case where a cargo bed surface has the damages, irregularities are present in the surface, so that when ore is transported thereon in an unchanged condition, a large amount of ore is left behind. Also, installation of a liner on the cargo bed having irregularities is not easy. The coating method of the present embodiment can be easily applied to the cargo bed having such damages, so that the method can be revolutionary, allowing the cargo bed to be repaired for reuse.

[0097] <Vehicle and cargo bed>

The vehicle to which the coating method of the present embodiment is applied is a vehicle having a cargo bed on which ore is loaded, and examples thereof include a truck such as a dump truck, a

FP19-0170-00 freight car, a handcart, an electric carrier, a motorized carrier, and a crawler carrier. Also, the coating method of the present embodiment is a method for applying a coating composition, which is therefore applicable to a cargo bed having any shape. The shape of the cargo bed is not particularly limited, and may be in any shape of a plate, a rectangle, a downward opening, an upward opening, a scoop end, a bucket, or a belt conveyor.

[0098] <Method of transporting ore>

The method of transporting ore of the present embodiment is a method wherein a coating layer containing a cleavable material is formed on at least a part of the surface of the cargo bed of a vehicle for transporting ore, the ore is loaded on the cargo bed and transported, and then the ore is allowed to slide down together with a part of the cleavable material by tilting the cargo bed at the transport destination and cleaving the part of the cleavable material in contact with the ore. [0099] Examples of the ore to be transported include iron ore, copper ore, other base metal ore, coal and oil shale. The ore may include impurities such as clay, earth and sand. The ore may include iron ore and clay. According to the method of transporting ore of the present embodiment, even when transporting ore containing a component such as clay which easily adheres to the cargo bed, the ore is allowed to slide down from the cargo bed together with a part of the cleavable material contained in the coating layer on the cargo bed surface when unloaded, so that the ore can be easily and efficiently unloaded and inhibited from left behind on the cargo bed.

[0100] According to the method of transporting ore of the present

FP19-0170-00 embodiment, the ore loaded on the cargo bed of a vehicle is allowed not to wobble during transport, and when the cargo bed is tilted at a transport destination, the cleavable material is cleaved on the cargo bed surface prior to collapsing of the piled ore, so that the ore is allowed to easily slide down. Carrying back of the ore can be therefore effectively prevented. Also, even when some carry-back ore remains at a place on a part of the cargo bed, increase in the amount of the carry-back ore due to further adhesion to the region allows the cleavable material to be cleaved by the load and the adhered ore to slide down, so that the amount of the carry-back ore can be restricted.

[0101] Also, for use other than as the cargo bed of a vehicle, by allowing the cleavable material not to be cleaved at the time when a slight amount of goods adheres to the loading surface and to be cleaved after increase in the amount of adhesion to an extent for sliding down, the coating layer is prevented from unnecessarily wearing down, so that high durability can be achieved. Also, by adjusting the composition of the coating layer, the stress to cause cleaving of the cleavable material can be adjusted.

[0102] Although the present disclosure has been described in detail based on the preferred embodiments thereof, the present disclosure is not limited to the embodiment.

[0103] For example, in the embodiments of the coating method, the maintenance method, and the method for repairing and flattening a cargo bed surface described above, the case of forming a coating layer on the cargo bed of a vehicle for transporting ore has been described, the coating method, the maintenance method and the method for

FP19-0170-00 repairing and flattening the surface of the present disclosure can be applied to objects other than the cargo bed of a vehicle. Examples of the applicable object other than the cargo bed of a vehicle include a transport chute and a conveyor for use in transport of a goods. To these objects, the coating method, the maintenance method and the method for repairing and flattening the object surface described above may be applied. In particular, a transport chute can be used for moving ore in the same manner as the cargo bed of a vehicle described above, so that the same effect as in the case where the method of the present disclosure is applied to the cargo bed can be exhibited. Also, examples of the goods other than ore include coke, rocks, earth and sand, gravel, and others including waste.

[0104] Also, the present disclosure can provide a method of transporting ore, comprising a step of allowing ore on a loading surface having a coating layer containing a cleavable material in a tilted state, to slide down together with a part of the cleavable material by cleaving a part of the cleavable material in contact with the ore, and a transport device of ore comprising a loading surface comprising a coating layer containing a cleavable material, wherein the loading surface, in a tilted state, is a surface on which the ore is allowed to slide down together with a part of the cleavable material by cleaving a part of the cleavable material in contact with the ore. In the method of transporting ore and the transport device of ore also, the various aspects described in the preferred embodiments may be applied. Examples of the transport device of ore include a vehicle, a transport chute, and a conveyor.

Examples

FP19-0170-00 [0105] The present disclosure is described in further detail based on Examples as follows, though the present disclosure is not limited to the following Examples.

[0106] [Example 1] (Preparation of coating composition)

A base solution was obtained by stirring and mixing 1 part by mass of carboxymethyl cellulose (trade name: DN-10L, manufactured by Daicel Finechem Ltd.) as a water-soluble resin, 3 parts by mass of carbon black having an average particle diameter of 0.04 pm as inorganic filler, 8 parts by mass of flaky graphite powder having an average particle diameter of 5 pm (natural graphite particles, trade name: HSP, manufactured by Chuetsu Graphite Works Co., Ltd.) as graphite, 49.2 parts by mass of water as solvent, 0.2 parts by mass of aqueous ammonia as pH adjuster, and 1 part by mass of styrene-butadiene rubber (trade name: TRD2001, manufactured by JSR Corporation) as elastomer. To the base solution, 0.2 parts by mass of acetylene glycol dispersant (trade name: Olfme EXP. 4200, manufactured by Nissin Chemical Co., Ltd.) as wetting agent and 37.4 parts by mass of isopropyl alcohol as polar solvent were added to be stirred and mixed, so that a coating composition was obtained.

[0107] (Preparation of coating test piece)

A coating test piece was prepared by using the coating composition obtained by the following method. The coating composition was applied to one side of an iron plate with a length of 130 mm, a width of 130 mm and a thickness of 5 mm with an air spray, and dried by heating at 150°C for 15 minutes. Thereby, a coating test

FP19-0170-00 piece having a coating layer formed on the iron plate was obtained. In the coating test piece obtained, the thickness of the coating layer was 50 pm and the mass of the coating layer per unit area was 100 g/m². The surface on the side of coating layer of the coating test piece was used as a loading surface.

[0108] [Example 2] (Preparation of coating composition)

A base solution was obtained by stirring and mixing 1 part by mass of carboxymethyl cellulose (trade name: DN-10L, manufactured by Daicel Finechem Ltd.) as water-soluble resin, 18.5 parts by mass of flaky graphite powder having an average particle diameter of 5 pm (natural graphite particles, trade name: HSP, manufactured by Chuetsu Graphite Works Co., Ltd.) as graphite, 80.0 parts by mass of water as solvent, and 0.3 parts by mass of aqueous ammonia as pH adjuster. To the base solution, 0.2 parts by mass of acetylene glycol dispersant (trade name: Olfme EXP. 4200, manufactured by Nissin Chemical Co., Ltd.) as wetting agent was added to be stirred and mixed, so that a coating composition was obtained.

[0109] (Preparation of coating test piece)

A coating test piece was obtained by applying the coating composition in Example 2 to an iron plate and dried by the same method as in Example 1. In the coating test piece obtained, the thickness of the coating layer was 50 pm and the mass of the coating layer per unit area was 100 g/m².

[Comparative Example 1]

A coating test piece in Comparative Example 1 was prepared by

FP19-0170-00 spreading a polyethylene sheet (trade name: Clear Holder-Super Clear 10, manufactured by Kokuyo Co., Ltd.) on a metal plate (SS400, polished surface finish). The coating test piece was supposed to be a polyethylene plate for use as a truck liner. The surface on the side of the polyethylene sheet of the coating test piece was used as the loading surface.

[0110] [Comparative Example 2]

A metal plate (SS400, rotary polished surface finish) was prepared as a coating test piece in Comparative Example 2. The test piece was supposed to be the material of the cargo bed of a truck. [0111] <Chutetest>

The coating test pieces obtained in Examples and Comparative Examples were subjected to a chute test by the following method. Figure 3 is a schematic diagram illustrating a testing method in the chute test. First, as shown in Figure 3 (a), a cylinder 72 having an inner diameter of 70 ηιηιφ and a height of 30 mm was disposed on a loading surface 40a of a coating test piece 70, and the inside of the cylinder 72 was filled with a sample soil 60. The sample soil 60 was prepared by mixing 40 parts by mass of gardening soil (trade name: Akadamatsuchi, manufactured by Daiso Industries, Co., Ltd.), 60 parts by mass of iron oxide powder (trade name: Bengara, manufactured by Asaoka Ceramic Material Co., Ltd.) and water, such that the water content was controlled to 23 mass%. The Akadamatsuchi was pulverized with a mortar and pestle prior to the mixing.

[0112] Subsequently, as shown in Figure 3 (b), a piston 74 having an outer diameter equivalent to the inner diameter of the cylinder 72 was

FP19-0170-00 placed on the sample soil 60, and a weight 80 was further placed thereon through a supporting plate 76. Thereby, a stress of 50 kPa was applied to the sample soil 60 for 1 minute. After removal of the supporting plate 76 and the weight 80, as shown in Figure 3 (c), a small-sized weight 90 was placed on the piston 74. By changing the mass of the weight 90, a stress of 3 kPa or 5 kPa was applied to the sample soil 60. Subsequently, as shown in Figure 3 (d), a loading surface 40a with the stress applied was tilted at a speed of l°/second to measure the tilt angle 0 at which the cylinder 72 started sliding. The smaller the tilt angle 0 is, the more excellent the downward slidability is. The results are shown in Table 1. Incidentally, through observation of the surface of the sample soil 60 in contact with the loading surface after the chute test by using the coating test pieces in Examples 1 and 2, adhesion of graphite was confirmed. In Comparative Example 1, even with increase in the stress from 3 kPa to 5 kPa, the tilt angle at which sliding started hardly decreased. In Comparative Example 2, the tilt angle reached a high angle, so that the cylinder fell down without sliding.

[0113] [Table 1]

	Example 1	Example 2	Comparative Example 1	Comparative Example 2
Stress (kPa)	3	5	3	5	3	5	3	5
Tilt angle (°)	35	25	32	23	41	38	80	70

[0114] [Example 3 to 5]

A coating composition and a coating test piece were obtained in the same manner as in Example 1, except that each of the components

FP19-0170-00 shown in Table 2 was compounded in an amount shown in the table (unit: part by mass). Incidentally, in Example 5, an aggregated graphite powder having an average particle diameter of 10 μιη (natural graphite particles) was used as graphite in addition to flaky graphite powder having an average particle diameter of 5 μm. In the coating test pieces in Examples 3 to 5, the thickness of the coating layer was 20 μπι and each of the mass of the coating layer per unit area was 25 g/m². [0115] [Examples 6 to 7]

A coating composition was obtained in the same manner as in Example 1, except that each of the components shown in Table 2 was compounded in an amount shown in the table (unit: part by mass). By using the coating composition obtained, a coating test piece was prepared by the following method. The coating composition was applied to one side of an iron plate with a length of 130 mm, a width of 130 mm and a thickness of 5 mm with a brush, and dried by standing still at normal temperature (25°) for 1 hour. Thereby, a coating test piece having a coating layer formed on the iron plate was obtained. In the coating test piece of Examples 6 to 7, the thickness of the coating layer was 22 μπι and each of the mass of the coating layer per unit area was 35 g/m².

[0116] [Example8]

A coating composition was obtained in the same manner as in Example 1, except that each of the components shown in Table 2 was compounded in an amount shown in the table (unit: part by mass). By using the coating composition obtained, a coating test piece was prepared by the following method. The coating composition was

FP19-0170-00 applied to one side of an iron plate with a length of 130 mm, a width of

130 mm and a thickness of 5 mm using a bar coater with a gap of 50 pm, and dried by standing still at normal temperature (25°) for 1 hour.

Thereby, a coating test piece having a coating layer formed on the iron plate was obtained. In the coating test piece obtained, the thickness of the coating layer was 25 pm and the mass of the coating layer per unit area was 40 g/m².

[0117] [Table 2]

Component	Example 1	Example 3	Example 4	Example 5	Example 6	Example 7	Example 8
Flaky graphite	8	8	8	4.2	16	16	25.4
Aggregated graphite	-	-	-	4.2	-	-	-
Carboxymethyl cellulose	1	1	1	0.5	2	2	3.2
Styrene-butadiene rubber	1	1	1	0.5	2	2	3.2
Water	49.2	36.7	9.2	9.6	18.5	73.5	29.2
Isopropyl alcohol	37.4	49.9	77.5	80.7	55.2	-	29.2
Carbon black	3	3	3	-	6	6	9.4
Acetylene glycol dispersant	0.2	0.2	0.2	0.2	0.2	-	0.2
Aqueous ammonia	0.2	0.2	0.1	0.1	0.1	0.5	0.2

[0118] <Evaluation on slidability>

The slidability of the coating test pieces obtained in Examples and Comparative Examples was evaluated by the following method. Here, Figure 4 is a schematic diagram illustrating an evaluation method of slidability. First, as shown in Figure 4 (a), a round plate 31 made of 15 metal having a diameter (inner diameter of opening) of 45 mm and a flat bottom was filled with a gardening clay 33 (trade name: Specially Sieved, manufactured by Joyful Honda Co., Ltd.) and the surface was

FP19-0170-00 flattened with a spatula made of polyethylene. The round plate 31 filled with the clay 33 wad stuck to the upper face of the weight 37 having a hook 39 on a side face with a double-stick tape 35. Thereby, a movable weight 30 having a smooth surface of clay 33 was obtained. The mass M of the movable weight 30 was 1.7 kg. The water content of the clay 33 was 23 mass%.

[0119] Subsequently, as shown in Figure 4 (b), the movable weight 30 was placed on the coating test piece 40 fixed to a horizontal pedestal 42 with the smooth surface of the clay 33 facing down. Here, the coating test piece 40 in Examples was disposed such that the surface on the side of the coating layer was in contact with the movable weight 30. On the same pedestal 42, a desktop testing machine 50 (trade name: small-sized desktop testing machine FGS-50TV, manufactured by Nidec-Shimpo Corporation) capable of vertically driving a force gauge (push pull gauge) 52 at a constant speed was installed, and a hook 39 on the side face of the movable weight 30 and the tip of a force gauge 52 were connected with a stainless steel wire 44 through a pulley 46 installed immediately below the force gauge 52.

[0120] While the force gauge 52 was raised at a constant speed, the tension T applied to the force gauge 52 was recorded. Here, the moving speed of the force gauge 52 was set at 60 mm/minute. On this occasion, the surface stress in the direction vertical to the frictional surface determined by dividing the mass M of the movable weight 30 by the contact area between the clay 33 and the coating test piece 40 was 11 kPa.

[0121] Under assumption that the tension T is equal to the friction force

FP19-0170-00 f developed between the clay 33 and the surface of the coating test piece 40 and the normal force N is equal to the mass M of the movable weight 30, a relation represented by the following formula (1) is established among the friction force f, the normal force N, and friction coefficient μ, and the temporal change in the friction coefficient μ was therefore measured.

ί=μ·Ν (1) [0122] The temporal change in the friction force f is schematically shown in Figure 5. Here, the initial peak value of the friction force f with the passage of time was defined as static friction force f₀, the friction coefficient at that time as static friction coefficient μο, an average value after the friction force became constant as dynamic friction force f, and the friction coefficient at that time as dynamic friction coefficient μ'.

[0123] In the test results (temporal change in friction force and friction coefficient), the friction coefficient μ was divided by the dynamic friction coefficient μ' measured for the coating test piece in Comparative Example 1 to convert into the normalized friction coefficient. The graph of temporal change in the normalized friction coefficient measured for the coating test pieces in Example 1 and Comparative Example 1 is shown in Figure 6. Also, the values of the normalized friction coefficient measured for the coating test pieces in Examples 1, and 3 to 7 and Comparative Example 1 are shown in Table 3.

[0124] [Table 3]

FP19-0170-00

	Normalized static friction coefficient	Normalized dynamic friction coefficient
Example 1	0.9	1.2
Example 3	0.9	1.2
Example 4	0.9	1.2
Example 5	0.8	1.1
Example 6	1.0	1.3
Example 7	0.9	1.2
Example 8	0.9	1.2
Comparative Example 1	1.5	1.0

[0125] The coating test piece in Example 1 had a dynamic friction coefficient on the clay surface approximately equal to, though somewhat higher than, that of the coating test piece in Comparative 5 Example 1, and had a definitely low static friction coefficient.

Because of this, it was found that the coating test piece in Example 1 has slidability equal to or higher than that of the polyethylene plate. In other words, in comparison between the surface of the polyethylene plate and the surface of the coating test piece in Example 1, when a 10 plane on which an object containing clay is placed is tilted from horizontal, the static friction coefficient is definitely lower on the surface of the coating test piece in Example 1, so that the object thereon is allowed to slide down easily. Also, in the comparison, it is presumed that the surfaces have similar difficulty in stopping a sliding 15 object, resulting from having a similar dynamic friction coefficient.

[0126] Also, the coating test pieces in Examples 3 to 8 had a dynamic friction coefficient at an approximately similar level on the clay surface in comparison with the coating test piece in Comparative Example 1 as

FP19-0170-00 in Example 1, and had a definitely lower static friction coefficient. [0127] The coating composition in Examples 1 to 8 can be applied to a metal surface with an air spray, a brush or a bar coater and dried to provide a coating layer thereon, so that a cargo bed, a transport chute or the like capable of inhibiting ore from being left behind can be formed by a method which is easier than the case of installing a liner.

Industrial Applicability [0128] According to the present disclosure, a moving method capable of easily moving various goods placed on a loading surface while inhibiting the goods from remaining on the loading surface can be provided. The moving method can be suitably used, for example, in the case where ore loaded on the cargo bed of a vehicle such as truck is unloaded from the cargo bed at a stock yard, and in the case where ore is moved with a transport chute at a stock yard or the like. Also, the moving method can be used when various goods other than ore are moved on a loading surface.

[0129] Also, according to the present disclosure, there can be provided a method of transporting ore capable of inhibiting ore from being left behind on a loading bed, when ore is loaded on the cargo bed of a vehicle such as truck at a mining site and transported, and the ore from the cargo bed is unloaded at a stock yard. Also, according to the present disclosure, a method of transporting ore and a transport device of ore capable of inhibiting the ore from adhering to the loading surface can be provided. Further, according to the present disclosure, a coating method and a coating composition of a cargo bed which are applicable to the moving method and the transport method are provided together

FP19-0170-00 with a method for improving the slidability of a cargo bed, a method for repairing a cargo bed, a method for flattening a cargo bed and a method for maintaining a cargo bed by taking advantage of the coating method.

Reference Signs List [0130] 2: Cleavable material, 3: Cleaved material, 4: Binder, 6: Coating layer, 7: Foundation component, 8: Goods, 10: Dump truck, 12: Cargo bed, 14: Coating film, 22: Air spray, 24: Heating lamp, 60: Sample soil, 70: Coating test piece, 72: Cylinder, 74: Piston, 76: Supporting plate, 80, 90: Weight.

Claims (27)

1. CLAIMS [Claim 1] A method for moving a goods on a loading surface, the loading surface comprising a coating layer containing a cleavable material, wherein the goods is allowed to slide down together with a part of the cleavable material by tilting the loading surface and cleaving a part of the cleavable material in contact with the goods.
2. [Claim 2] The method of moving a goods according to claim 1, wherein the cleavable material contains graphite.
3. [Claim 3] The method of moving a goods according to claim 1 or 2, wherein the coating layer further contains a binder.
4. [Claim 4] The method of moving a goods according to claim 3, wherein the binder contains a water-soluble resin.
5. [Claim 5] The method of moving a goods according to any one of claims 1 to 4, wherein the loading surface is tilted by 1 to 90°.
6. [Claim 6] The method of moving a goods according to any one of claims 1 to 5, wherein the goods comprises ore.
7. [Claim 7] The method of moving a goods according to claim 6, wherein the ore comprises iron ore and clay
8. [Claim 8] The method of moving a goods according to any one of claims 1 to 7, wherein a water content of the goods is 0 to 50 mass%.
9. [Claim 9] The method of moving a goods according to any one of claims 1 to 8, wherein the loading surface is a surface of a cargo bed of a vehicle.
10. [Claim 10] The method of moving a goods according to any one of claims 1 to 8, wherein the loading surface is a tilted surface of a

    FP19-0170-00 transport chute.
11. [Claim 11] A method of transporting ore, wherein a coating layer containing a cleavable material is formed on at least a part of a surface of a cargo bed of a vehicle for transporting ore, the ore is loaded on the cargo bed and transported, and then the ore is allowed to slide down together with a part of the cleavable material by tilting the cargo bed at a transport destination and cleaving a part of the cleavable material in contact with the ore.
12. [Claim 12] A method of transporting ore, comprising a step of allowing ore on a loading surface having a coating layer containing a cleavable material in a tilted state, to slide down together with a part of the cleavable material by cleaving a part of the cleavable material in contact with the ore.
13. [Claim 13] The method of transporting ore according to claim 12, wherein the loading surface is a surface of a cargo bed of a vehicle.
14. [Claim 14] The method of transporting ore according to claim 12, wherein the loading surface is a tilted surface of a transport chute.
15. [Claim 15] The method of transporting ore according to any one of claims 11 to 14, wherein the cleavable material contains graphite.
16. [Claim 16] The method of transporting ore according to any one of claims 11 to 15, wherein the coating layer further contains a binder.
17. [Claim 17] The method of transporting ore according to claim 16, wherein the binder contains a water-soluble resin.
18. [Claim 18] The method of transporting ore according to any one of claims 11 to 17, wherein the ore comprises iron ore and clay
19. [Claim 19] The method of transporting ore according to any one of

    FP19-0170-00 claims 11 to 18, wherein a water content of the ore is 0 to 50 mass%.
20. [Claim 20] A transport device of ore, comprising a loading surface comprising a coating layer containing a cleavable material, wherein the loading surface, in a tilted state, is a surface on which the ore is allowed to slide down together with a part of the cleavable material by cleaving a part of the cleavable material in contact with the ore.
21. [Claim 21] The transport device of ore according to claim 20, wherein the cleavable material contains graphite.
22. [Claim 22] The transport device of ore according to claim 20 or 21, wherein the coating layer further contains a binder.
23. [Claim 23] The transport device of ore according to claim 22, wherein the binder contains a water-soluble binder.
24. [Claim 24] The transport device of ore according to any one of claims 20 to 23, wherein the ore comprises iron ore and clay.
25. [Claim 25] The transport device of ore according to any one of claims 20 to 24, wherein a water content of the ore is 0 to 50 mass%.
26. [Claim 26] The transport device of ore according to any one of claims 20 to 25, wherein the loading surface is a surface of a cargo bed of a vehicle.
27. [Claim 27] The transport device of ore according to any one of claims 20 to 25, wherein the loading surface is a tilted surface of a transport chute.