Processing device and processing method for hydrogen-sulphide-containing barren solution

Patent metadata

Field	Value
Publication number	US-9731980-B2
Application number	US-201314651396-A
Country	US
Kind code	B2
Filing date	Nov 22, 2013
Priority date	Dec 11, 2012
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

Provided are a treatment method for a barren solution, and a treatment device for a barren solution, with which hydrogen sulfide can be efficiently removed from the barren solution. In an aeration tank provided with a vertical-type cylindrical reaction vessel, stirring blades arranged in the reaction vessel, and an annular aeration tube having a large number of air outlets, which is arranged to a bottom part of the reaction vessel, aeration is performed by blowing gas for aeration into the reaction vessel from a large number of air outlets of the aeration tube while stirring a liquid by rotation of the stirring blades.

First claim

The invention claimed is:

1. A treatment method for a barren solution containing hydrogen sulfide, wherein
in an aeration tank provided with a vertical-type cylindrical reaction vessel, stirring blades arranged in the reaction vessel, and an annular aeration tube having 10 to 20 air outlets and being arranged to a bottom part of the reaction vessel,
hydrogen sulfide is removed from the barren solution in a hydrogen sulfide removal step arranged as a preceding step of a detoxification step by partly adding a slurry after leaching obtained in a leaching step into a barren solution containing the hydrogen sulfide obtained as a process liquid after a sulfurization process in a hydrometallurgy plant for a nickel oxide ore and introducing gas for aeration into the reaction vessel from 10 to 20 air outlets of the aeration tube to perform aeration while stirring a barren solution containing hydrogen sulfide by rotation of the stirring blades.

2. The treatment method for a barren solution containing hydrogen sulfide according to claim 1 , wherein
the barren solution obtained by removing the hydrogen sulfide is returned to a solid-liquid separation step to reuse as washing water.

3. The treatment method for a barren solution containing hydrogen sulfide according to claim 1 , wherein
aeration is performed by the aeration tube formed in an annular shape having a diameter size of 70 to 90% of that of the reaction vessel.

4. The treatment method for a barren solution containing hydrogen sulfide according to claim 3 , wherein
aeration is performed from the air outlets formed in a circular shape having a diameter of 10 to 20 mm.

5. The treatment method for a barren solution containing hydrogen sulfide according to claim 4 , wherein
aeration is performed via short tube pipes arranged at equal intervals in the aeration tube as the air outlets.

6. The treatment method for a barren solution containing hydrogen sulfide according to claim 5 , wherein
the gas for aeration is air.

7. A treatment device for a barren solution containing hydrogen sulfide, comprising:
an aeration tank provided with a vertical-type cylindrical reaction vessel, stirring blades arranged in the reaction vessel, and an annular aeration tube having 10 to 20 air outlets and being arranged to a bottom part of the reaction vessel, wherein
in the aeration tank, hydrogen sulfide is removed from the barren solution in a hydrogen sulfide removal step arranged as a preceding step of a detoxification step by partly adding a slurry after leaching obtained in a leaching step into a barren solution containing the hydrogen sulfide obtained as a process liquid after a sulfurization process in a hydrometallurgy plant for a nickel oxide ore and introducing gas for aeration into the reaction vessel from 10 to 20 air outlets of the aeration tube to perform aeration, while adding a part of slurry after leaching obtained in a leaching step to a barren solution containing the hydrogen sulfide obtained as a process liquid after sulfurization process in a hydrometallurgy plant for a nickel oxide ore and stirring a barren solution containing hydrogen sulfide by rotation of the stirring blades,
wherein aeration is performed by the aeration tube formed in an annular shape having a diameter size of 70 to 90% of that of the reaction vessel,
aeration is performed from the air outlets formed in a circular shape having a diameter of 10 to 20 mm, and
aeration is performed via short tube pipes arranged at equal intervals in the aeration tube as the air outlets.

8. The treatment device for a barren solution containing hydrogen sulfide according to claim 7 , wherein
the barren solution obtained by removing the hydrogen sulfide is returned to a solid-liquid separation step to reuse as washing water.

9. The treatment device for a barren solution containing hydrogen sulfide according to claim 7 , wherein
the gas for aeration is air.

Assignees

• Sumitomo Metal Mining Co

Inventors

• Nakai Takayuki
• Matsubara Satoshi
• Nakai Osamu
• Kyoda Yoji

Classifications

• C02F1/20 Primary

  by degassing, i.e. liberation of dissolved gases (degasification of liquids in general B01D19/00; arrangement of degassing apparatus in boiler feed supply F22D) · CPC title

• C02F2103/16

  from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes · CPC title

• C02F2103/10

  from quarries or from mining activities · CPC title

• C02F1/74 Primary

  with air (aeration of stretches of water C02F7/00) · CPC title

• C02F2103/02

  Non-contaminated water, e.g. for industrial water supply · CPC title