US3893577A - Method for demolishing a consolidated and hardened iron ore powder body contained in a hold of an iron ore carrier - Google Patents

Method for demolishing a consolidated and hardened iron ore powder body contained in a hold of an iron ore carrier Download PDF

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Publication number
US3893577A
US3893577A US386328A US38632873A US3893577A US 3893577 A US3893577 A US 3893577A US 386328 A US386328 A US 386328A US 38632873 A US38632873 A US 38632873A US 3893577 A US3893577 A US 3893577A
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Prior art keywords
iron ore
hold
carrier
consolidated
hardened
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Expired - Lifetime
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US386328A
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English (en)
Inventor
Koetsu Asai
Nobuyuki Imanishi
Terutoshi Yamada
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Kobe Steel Ltd
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Kobe Steel Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/04—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods solid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
    • B63B27/19—Other loading or unloading equipment involving an intermittent action, not provided in groups B63B27/04 - B63B27/18

Definitions

  • ABSTRACT A method of demolishing a consolidated and hardened iron ore powder body contained in a hold of an iron ore carrier, which comprises the steps of: placing at least one mechanical member in the hold of the iron ore carrier, before the iron ore in a slurry state is charged into the hold; loading the iron in a slurry state into the hold; and causing the mechanical member to move relative to the iron ore body in which the memher is buried, at the time of unloading the iron ore which has already been consolidated and hardened.
  • Iron-ore refers to a magnetite of a lower iron content, which is supplied in fine powder after being crushed and dressed by a known method.
  • the size of the aforesaid fine powder is 44p. which usually occupies 80% of the total amount of the iron ore.
  • a large scale reservoir or pond near the shipping harbor is required for storing a great amount of ironore in a slurry state for subsequent loading, whereas the simple land-piling of iron-ore in the former system is possible. This in turn requires a broad site for such reservoirs.
  • the water content in the ore body is reduced to about 7 to 8%.
  • This value is naturally dependent on the time period of the navigation, ranging from 8 to 10% as an average.
  • the ore body thus consolidated and hardened is very stable in shape and therefore such consolidated ore body may not crumble even if it remains in the form of a vertically extending wall along the sidewalls of the hold of the carrier, although it may be demolished by driving therein a tool having a sharp edge.
  • Such gravity consolidated and hardended ore body may be again restored to a slurry state by spraying it with water under pressure to transport it to a refinery a long distance from the unloading harbor.
  • this attempt results in extremely higher expense, for transportation facilities with considerable difficulties and thus is impractical.
  • the present invention provides a method for avoiding the drawbacks of the conventional art, which method comprises the steps of: placing at least one mechanical member such as a flexible wire or expansible bag in the hold of an iron ore carrier, before the iron ore in a slurry state is charged in the hold; loading the iron in a slurry state in the hold; and causing the member to move relative to the iron ore body in which the material is buried, at the time of unloading the iron ore which has already been in a consolidated and hardened state due to the dyhydrating operation and/or sedimentation during transport.
  • a mechanical member such as a flexible wire or expansible bag
  • the iron ore carrier before the iron ore in a slurry state is charged in the hold
  • loading the iron in a slurry state in the hold and causing the member to move relative to the iron ore body in which the material is buried, at the time of unloading the iron ore which has already been in a consolidated and hardened state due to the dy
  • FIG. 1 is a transverse cross-sectional view of a hold of an iron ore carrier embodying the present invention, in which a length of chain is buried in the consolidated and hardened iron ore body;
  • FIG. 2 is a transverse cross-sectional view of a hold of an iron ore carrier embodying the present invention, in which lengths of wires having a plurality of anchors tied thereto are buried in the consolidated and hard ened iron ore body;
  • FIG. 3 is a transverse cross-sectional view of a hold of an iron ore carrier embodying the present invention, in which a plurality of wires are placed in spaced relation in the vertical plane;
  • FIG. 4 is a plan view of a hold of an iron ore carrie embodying the present invention, in which a plura ity of lengths of wire or chain are laid either in a longitudinal or a transverse direction in a horizontal plane;
  • FIGS. 5 and 6 are transverse cross-sectional views of a hold of an iron ore carrier embodying the present invention, in which a plurality of bag means are located along the vertical inner walls of the hold;
  • FIG. 7 is a transverse cross-sectional view of a hold of an iron ore carrier embodying the present invention, in which another modification is indicated;
  • FIGS. 1 through 4 cover the first type of embodiments of the present invention, in which lengths of wire or chain are used as flexible lines
  • FIGS. 5 through 10 refer to the second type of embodiments of the invention, in which a plurality of bag means are used instead of the flexible lines of the first type of embodiments for the same demolishing purpose.
  • FIG. 1 shows the transverse cross-sectional view of an iron ore carrier
  • a length of chain 3 which has been laid along and in contact with the inner walls of a hold 2, before the iron ore is charged into the hold in a slurry state.
  • One end of the chain 3 extends beyond one edge of a hatch coaming to a position on an upper deck 5, where the chain is firmly secured, while the other end of the chain 3 extends beyond the opposite edge of the hatch coaming for winding on a machine 6 positioned upon the upper deck 5.
  • FIG. 2 refers to another embodiment of the invention, in which a length of wire 8 having a plurality of anchors 7 tied thereto is used in place of the chain 3 of FIG. 1.
  • One end of the wire 8 extends beyond one edge of the hatch coaming for firm attachment to the upper deck, while the other end of the wire 8 extends beyond the other edge of the hatch coaming for winding on a machine located on the upper deck of the carrier.
  • a plurality of chains or wires of this kind may be used in case the use ofa single line of wire or chain is not desirable because too great a tension may be applied thereto.
  • the directions of wires or chains may be transverse or longitudinal with respect to the carrier, or a plurality of wires or chains may be placed in spaced relation one from the other in a vertical transverse plane.
  • FIG. 3 shows such an embodiment of the invention, in which chains 80, 8b are placed in spaced relation to each other in a vertical transverse plane.
  • the uppermost line of wireor chain 80 is first wound at the winding machine to cause the upward movement thereof for demolishing the consolidated and hardened ore body in the hold, followed by the winding of the second upper wire or chain 3b, and the same continues for the lower lines of wires in the iron ore body.
  • FIG. 4 shows a still further embodiment of the invention, in which chains are laid in a network, as shown.
  • a plurality of chains or wires 3p are provided for being wound at a winding machine, such that uniform demolishing forces may be applied to the iron ore body with increased demolishing efficiency.
  • the chains or wires of the network may be spaced from each other in a vertical plane as in the case with FIG. 3, for improving the demolishing efficiency of the iron ore body contained in the hold of a carrier.
  • the winding machine for use in winding lengths of wires or chains is preferably placed on the upper deck as shown in FIG. l and FIG. 2.
  • a mooring machine on board the carrier may be used in place of such a winding machine.
  • an unloader on land may be used for pulling the wires or chains.
  • FIGS. 5 through ll) show the second type of embodiments of the invention.
  • FIG. 5 shows the transverse cross-sectional view of an iron ore carrier, in which most of the central portion of the ore body is unloaded by means of a grab-bucket, leaving the iron ore body in a thick wall form along the inner walls of the hold.
  • Shown at l is a high pressure hydraulic pump, at 2 pressure-resisting piping, at 3 an adjusting valve, at 4 expansible bags which are placed along the inner walls of the hold, at 5 a supporting wire for suspending the bags 4 from the upper edge of the hold, at 11 a water discharge pump and at 13 a hook, to which the supporting wire is secured.
  • An air compressor or high pressure hydraulic pump 1 is located inside the carrier, being connected via the pressure resisting piping 2 to the expansible bags.
  • the expansible bags 4 are located along the inner walls of the hold 14, being suspended by a supporting wire from the hook id.
  • the adjusting valve will be closed at the completion of the collapse of the iron ore body toward the center of the hold, followed by gradual opening of the valve 3' to thereby discharge the water from the expansible bags 4 by means of the water discharge pump ii. in contrast thereto, in case air is used as a fluid.
  • the water discharge pump 11 is not required, but the mere opening of the discharge adjusting valve 3' can discharge the air from the bags.
  • the expansion and contraction of the expansible bags 4 may be carried out for each wall of the hold or may be carried out for all the walls of the hold simultaneously.
  • FIG. 7 shows another embodiment similar to that shown in FIG. 5, the difference being that the pressureresisting piping 2 runs from the top of the hold down to the bags 4 for connection thereto.
  • the operation of the bag system in this embodiment is the same as in FIG. 5 and FIG. 6.
  • the expansible or contractible bags as well as the pressurercsisting piping are installed on the carrier side. while the means for feeding fluid into said expansible bags and the means for discharging the fluid therefrom are located on the land side. Furthermore, it is possible that the expansible bags are expanded within the hold, before the slurry state iron ore is charged therein. and then the fluid is discharged at the time of unloading the iron ore from the hold, thus demolishing the consolidated and hardened iron ore body remaining along and in contact with the inner walls of the hold.
  • the expansible or contractible bags are made of a synthetic composite sheet in which the core sheet of synthetic fibers are coated with synthetic resin sheet. having a pressure resistance of an order of 5 lag/cm.
  • FIG. 8 shows one example of the arrangement of expansible bags and the configuration thereof.
  • the bag body 4 is divided into several sections or compartments extending in a vertical direction, each being independent from the other, but using a common pressure source outside the bag body.
  • the water or air under pressure is fed through the adjusting valve 3 to the bags 4.
  • FIG. 9 shows another arrangement of the bags as used in the present invention, in which the pressureresisting piping extends through the side walls of the hold.
  • a method for demolishing a consolidated and hardened iron ore powder body for the purpose of facilitating unloading the same from a hold of an iron ore carrier comprising the steps of:
  • said flexible lines are chains or wires which are placed along or in parallel to the inner surfaces or walls of said hold, whereby, when said chains or wires are wound, said chains or wires will be pulled upwardly through said consolidated and hardened iron ore body, thereby demolishing the same.
  • said bag means are made of a composite sheet material which consists of synthetic fibers, forming a core material, and a synthetic resin coated thereon. said composite sheet material being capable of withstanding a pressure of an order of 5 Kg/cm.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Load-Engaging Elements For Cranes (AREA)
US386328A 1972-08-09 1973-08-07 Method for demolishing a consolidated and hardened iron ore powder body contained in a hold of an iron ore carrier Expired - Lifetime US3893577A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47079591A JPS4936088A (de) 1972-08-09 1972-08-09

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US3893577A true US3893577A (en) 1975-07-08

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US (1) US3893577A (de)
JP (1) JPS4936088A (de)
DE (1) DE2339308A1 (de)
ES (1) ES417727A1 (de)
FR (1) FR2195572B1 (de)
GB (1) GB1438006A (de)
IT (1) IT995161B (de)
NL (1) NL7310814A (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5387481A (en) * 1977-01-10 1978-08-01 Hitachi Zosen Corp Apparatus for breaking powdery mineral loaded on board
FI65970C (fi) * 1982-11-16 1984-08-10 Helara Ky Transport- toemnings- och doseringsbehaollare foer korn- och pulverformigt material

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2228421A (en) * 1938-07-09 1941-01-14 Vilter Mfg Co Self-unloading bin
US2522466A (en) * 1945-03-03 1950-09-12 Schneider Transp Company General utility loading and unloading apparatus for ships and the like
US2576620A (en) * 1946-10-02 1951-11-27 Smith Corp A O Silo unloading device with means to dislodge silage for ready discharge
US3121500A (en) * 1961-05-22 1964-02-18 Franz Clouth Inflatable assemblies for storage bins and the like
US3606036A (en) * 1968-07-31 1971-09-20 Marcona Corp Method and apparatus for shipping mineral solids and other particulate matter

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB212641A (en) * 1922-12-14 1924-03-14 Joseph Baker Sons & Perkins Lt Improvements in or relating to feed hoppers
FR1591437A (de) * 1968-11-13 1970-04-27

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2228421A (en) * 1938-07-09 1941-01-14 Vilter Mfg Co Self-unloading bin
US2522466A (en) * 1945-03-03 1950-09-12 Schneider Transp Company General utility loading and unloading apparatus for ships and the like
US2576620A (en) * 1946-10-02 1951-11-27 Smith Corp A O Silo unloading device with means to dislodge silage for ready discharge
US3121500A (en) * 1961-05-22 1964-02-18 Franz Clouth Inflatable assemblies for storage bins and the like
US3606036A (en) * 1968-07-31 1971-09-20 Marcona Corp Method and apparatus for shipping mineral solids and other particulate matter

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Publication number Publication date
ES417727A1 (es) 1976-02-16
IT995161B (it) 1975-11-10
NL7310814A (de) 1974-02-12
GB1438006A (en) 1976-06-03
DE2339308A1 (de) 1974-02-28
JPS4936088A (de) 1974-04-03
FR2195572B1 (de) 1977-09-09
FR2195572A1 (de) 1974-03-08

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