JPS584672B2 - Re-slurry unloading method of fine ore - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for reslurrying and unloading fine ore.

Powdered ore (iron ore powder) is loaded into the cargo hold in the form of a slurry at the loading port.
It settles due to the difference in specific gravity with water and is deposited in a dehydrated and consolidated state.

The powdered ore in such a consolidated pile is hard and therefore cannot be easily unloaded with a grab bucket.

In addition, powder ore in a consolidated pile is not only hard, but also adheres to the ship's side walls and bottom walls, so even if it is possible to unload with a grab bucket, it will only be at the bottom of the hatch and on the bottom wall. The depth is so low that complete unloading cannot be expected.

For this reason, a method has recently been adopted in which high-pressure liquid is injected into the fine ore from the top or bottom, and the fine ore is unloaded using a pump transport system while being reslurried.

The present invention relates to a reslurry unloading method for fine ore based on the reslurry unloading described above, and its purpose is to effectively utilize high-pressure liquid with a small jetting force while The advantage is that the cargo can be unloaded while gradually and smoothly cutting down from the lower layer.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIGS. 1 and 5, reference numeral 1 denotes a ship's hull, and its hold 2 is formed by side walls 3 and a double bottom wall 4 inclined at the bottom of the center.
Further, a pilge well 5 is formed in the center of the double bottom wall 4.

Reference numeral 6 denotes a liquid jet nozzle body, which has nozzles 7 and 8 for cutting down fine ore at its lower end and its upper part.

That is, the liquid injection nozzle body 6 is formed into a double cylinder consisting of an outer cylinder 9 and an inner cylinder 10, and the lower part of the inner cylinder 10 is made to protrude from the outer cylinder bottom plate 9A, and the two are integrated. A nozzle 7 for cutting down fine ore is provided on the protrusion of the outer cylinder 9, and a nozzle 8 for cutting down fine ore is provided on the outer periphery of the outer cylinder 9 over a certain height.

The liquid jet nozzle body 6 is attached to a frame 1 provided in the hatch 11.
2 is inserted through the frame 12, and can be raised and lowered by a lifting mechanism, for example, a rack and pinion mechanism, provided between the frame 12 and the outer cylinder bottom plate 9A comes into contact with the opening edge of the bilge well 5, and the inner cylinder 10 The protrusion is configured to be located within the bilge well 5.

In addition, the upper end of the liquid jet nozzle body 6 is filled with liquid (water, seawater, etc.)
It communicates with the supply pipe 13.

The lower end of the bilge well 5 communicates with an eductor 15 via a communication pipe 14, and one end of the eductor 15 communicates with a seawater introduction pipe 16, and the other end communicates with a slurry unloading pipe 18 having a pump 17. ing.

These 14 to 18 constitute a slurry transport device.

FIG. 1 shows a state in which fine ore 19 is loaded. In other words, the liquid jet nozzle body 6 is lowered to bring the outer cylinder bottom plate 9A into contact with the opening edge of the bilge well 5, and the protruding part of the inner cylinder 10 is moved into the bilge well 5. Slurry is loaded in a state where the bilge well 5 is located, and then the water is drained to deposit the fine ore 19 without reaching the bilge well 5.

In order to unload the fine ore 19 in such a state, first, the ore cutting nozzle 8 of the outer cylinder 9 is used to inject high-pressure liquid, and as shown in FIG. Cut it down and turn it into a slurry.

As a result, the adhesion of the fine ore 19 to the liquid jet nozzle body 6 is released.

Next, the liquid injection nozzle body 6 is gradually raised while the liquid injection from the powder ore cutting nozzle 8 is stopped and the liquid injection from the powder ore cutting nozzle 7 is started.

Then, as shown in FIG. 3, the powdered ore 19 is cut down from its lower layer to form a slurry, and this slurry flows into the bilge well 5 and reaches the eductor 15 via the communication pipe 14.

Since the pump 17 has already been operated at this time, the slurry is continuously lifted through the slurry unloading pipe 18 by the mixing action and the eductor action.

Through this process, as shown in FIG. 4, the powdered ore 19 is unloaded while being cut down, and finally all of the ore is unloaded.

According to the present invention described in the embodiments above, after the high-pressure liquid is injected from the nozzle around the outer cylinder of the liquid injection nozzle body to release the adhesion of powder ore to the liquid injection nozzle body, the liquid injection nozzle body is lifted up. The high-pressure liquid from the nozzle at the bottom end of the inner cylinder is used to break down the fine ore and turn it into a slurry. Therefore, while making effective use of the high-pressure liquid with a small jetting force, the fine ore is gradually and smoothly broken down from the lower layer and unloaded. Therefore, economical unloading can be expected in terms of equipment and time.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIGS. 1 to 4 are cross-sectional views showing the operating state, and FIG. 5 is a cross-sectional view of the liquid jet nozzle body. 2... hold, 5... bilge well, 6
...Liquid injection nozzle body, 7, 8 ... Nozzle for cutting down powder ore, 9 ... Outer cylinder, 10 ...
...Inner cylinder, 13...Liquid supply pipe, 15...
... Eductor, 16 ... Seawater introduction pipe, 17
... Pump, 18 ... Slurry unloading pipe, 19 ... Powder ore.

Claims (1)

[Claims] 1. In the method of slurrying the fine ore in the hold and unloading it from the bilge well at the bottom of the hold, an outer cylinder is provided with a nozzle for cutting down the fine ore over the upper and lower sides of the circumference, and a part that penetrates the inside of the outer cylinder and is inserted around the protrusion at the lower end. It consists of an inner cylinder equipped with a nozzle for cutting down powdered ore, and a liquid nozzle spray body is supported in the upper part of the hold so that it can be raised and lowered, and the powder is deposited in the hold with the liquid nozzle positioned inside the hold. When unloading ore, first, liquid is injected from the powdered ore cutting nozzle in the outer cylinder to break down the powdered ore around the liquid injection nozzle body, and then the liquid injection nozzle body is raised to break down the powdered ore in the inner cylinder. A reslurry lifting method for fine ore, which is characterized by ejecting liquid from a nozzle to re-slurry the fine ore while breaking it down from its lower layer, and unloading this slurry by a slurry transport device via a pilge well at the bottom of the hold. Loading method.