JPS583877B2 - Consolidation relaxation method for powdered ore slurry - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for deconsolidating fine ore slurry.

Fine ore powder is loaded into the ship's hold in the form of a slurry at the loading port, but during anchorage and voyage after loading, it settles due to the difference in specific gravity with water, and is deposited in a dehydrated, consolidated state.

Iron ore powder in such a consolidated pile is hard and therefore cannot be easily unloaded by club packets.

For this reason, a method has recently been adopted in which iron ore powder is injected with high-pressure liquid from above or below, and is unloaded using a pump transportation system while reslurrying the powder.

According to this, it is possible to lift the cargo by re-slurrying, but as mentioned above, it is in a consolidated state, so cutting down by jetting high-pressure liquid cannot be done quickly even if high-pressure liquid is used. do not have.

In order to solve this problem, a method has been considered in which air is introduced from the bottom of the hold to relieve the consolidation before unloading the (consolidated) powdered ore slurry from the hold.

However, according to this method, it is very difficult to create fine bubbles at the stage of introducing air bubbles, and the bubbles end up being rather large.

- These bubbles coalesce into larger bubbles within the layer of fine ore slurry.

・These air bubbles are not retained within the layer and tend to rise.

There are problems such as:

Therefore, the present invention provides a method for deconsolidating powdered ore slurry that can solve the above-mentioned problems, and one embodiment of the method will be described below with reference to the drawings.

Reference numeral 1 designates a hold formed by a bulkhead 2 and a bottom wall (double bottom) 3, which has a hatch 4 at its upper end and a well 5 formed in the bottom wall 3.

This well 5 is provided with a high-pressure liquid injection nozzle 8 to which a liquid supply pipe 7 with a pump 6 is connected, and a fine ore slurry discharge pipe 10 with a pump 9 is provided.

Reference numeral 11 denotes a plurality of dilute acid distribution pipes provided horizontally at the bottom of the hold 1, and each of these dilute acid distribution pipes 11 has a large number of ejection holes 12.
and communicates with the dilute acid supply pipe 13.

As shown in FIG. 2, the cargo hold 1 is loaded with powdered ore slurry 14, and the vessel sails to the unloading port with the supernatant water discharged.

Before unloading the fine ore slurry 14 from the hold 1 at the unloading port, dilute acid is jetted out from each jetting hole 12 via the dilute acid supply pipe 13 and the dilute acid distribution pipe 11.

As a result, hydrogen gas (H2) is generated by the reaction between the dilute acid and the powdered ore slurry (iron (Fe)).

That is, to show an example of the reaction, in the case of hydrochloric acid (HCI), Fe + 2 HCI- + FeCl 2 + H2 sulfuric acid (
In the case of H2 SO4 ), Fe + H2 SO4 → Fe SO4 + H2 nitric acid (
In the case of HNO3), Fe + 2 HNO 3 → Fe ( NO 3
) 2 + H2, etc.

In addition, the concentration as a dilute acid is 0.1 normal concentration or less (approximately 0
．． A regulation of 0.01 to 0.1 is desirable.

) and diluted with water in the fine ore slurry 14 to have a final concentration of about 1×10 −5 to 1×10 −8 normal.

The aforementioned hydrogen gas (H2) is generated as extremely fine bubbles on the iron ore surface, so it remains attached to the surface due to the gas-liquid solid interfacial tension and does not coalesce with other bubbles, remaining within the layer. The void ratio of the adjacent layer becomes dog, and consolidation is alleviated.

As shown in FIG. 3, the unloaded fine ore slurry 14 that has been deconsolidated is broken down by high-pressure liquid from the high-pressure liquid injection nozzle 8 to form a reslurry, and then passed through the fine ore slurry discharge pipe 10. It is done.

According to the present invention described in the examples above, dilute acid is supplied before unloading the fine ore slurry, and hydrogen gas is generated by the reaction between the dilute acid and the fine ore slurry. The bubbles are generated as extremely fine bubbles on the surface of iron ore (fine ore), and they adhere to the surface due to gas-liquid solid interfacial tension and are retained within the layer without proceeding to coalesce with other bubbles. As a result, the void ratio of the layer increases and the consolidation is relaxed.

Therefore, lifting for reslurry, ie, cutting down by jetting high-pressure liquid, can be easily and quickly performed even if a low-pressure liquid is used.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a cross-sectional perspective view;
FIGS. 2 and 3 are cross-sectional views showing working conditions. 1... hold, 2... bulkhead, 3...
... Bottom wall, 5 ... Well, 7 ... Liquid supply pipe, 8 ... High pressure liquid injection nozzle, 10 ...
...Powdered ore slurry discharge pipe, 11...Dilute acid distribution pipe, 12...Blowout hole, 13...Dilute acid supply pipe, 14...・Powdered ore slurry.

Claims (1)

[Claims] 1. A method for deconsolidating powdered ore slurry, which is characterized by supplying dilute acid from the bottom of the hold before unloading the powdered ore slurry from the ship's hold, and generating hydrogen gas through the reaction between this dilute acid and the powdered ore slurry. .