Extraction system

Patent metadata

Field	Value
Publication number	US-2022105446-A1
Application number	US-202117472394-A
Country	US
Kind code	A1
Filing date	Sep 10, 2021
Priority date	Oct 2, 2020
Publication date	Apr 7, 2022
Grant date	—

Abstract

An extraction system includes an extractor that carries out an extraction treatment of bringing a raw material liquid into contact with an extraction liquid so that metal ions are extracted from the raw material liquid to migrate to the extraction liquid, a raw material liquid return path that leads the raw material liquid from a separator to a raw material liquid tank; and a raw material liquid pH regulator addition apparatus connected to a raw material liquid pH adjustment place that is one of the raw material liquid tank and the raw material liquid return path, the raw material liquid pH regulator addition apparatus configured to add a raw material liquid pH regulator to the raw material liquid, the raw material liquid pH regulator being a pH regulator that increases pH of the raw material liquid that have been decreased by the extraction treatment.

First claim

1 . An extraction system that causes an extraction liquid to extract metal ions from a raw material liquid that is an aqueous solution containing the metal ions, the extraction system comprising:
a raw material liquid tank holding the raw material liquid; an extraction liquid tank holding the extraction liquid; an extractor that is connected to the raw material liquid tank to allow the raw material liquid to be led from the raw material liquid tank into the extractor and that is connected to the extraction liquid tank to allow the extraction liquid to be led from the extraction liquid tank into the extractor, the extractor carrying out an extraction treatment of bringing the raw material liquid led in from the raw material liquid tank into contact with the extraction liquid led in from the extraction liquid tank so that the metal ions are extracted from the raw material liquid to migrate to the extraction liquid; a separator connected to the extractor so as to receive, from the extractor, a mixture liquid of the raw material liquid and the extraction liquid that have been subjected to the extraction treatment, the separator separating the received mixture liquid into the raw material liquid and the extraction liquid; a raw material liquid return path that connects the separator to the raw material liquid tank so as to lead the separated raw material liquid from the separator to the raw material liquid tank, the separated raw material liquid being the raw material liquid separated by the separator; an extraction liquid return path that connects the separator to the extraction liquid tank so as to lead the separated extraction liquid from the separator to the extraction liquid tank, the separated extraction liquid being the extraction liquid separated by the separator; and a raw material liquid pH regulator addition apparatus connected to a raw material liquid pH adjustment place that is one of the raw material liquid tank and the raw material liquid return path, the raw material liquid pH regulator addition apparatus configured to add a raw material liquid pH regulator to the raw material liquid in the raw material liquid pH adjustment place, the raw material liquid pH regulator being a pH regulator that increases pH of the raw material liquid, the pH having been decreased by the extraction treatment.

2 . The extraction system according to claim 1 , wherein
the raw material liquid pH regulator addition apparatus includes: a raw material liquid pH regulator reservoir unit holding the raw material liquid pH regulator; and a raw material liquid pH regulator addition adjusting unit that adjusts an amount of addition of the raw material liquid pH regulator to any given amount, the amount of addition being an amount of addition of the raw material liquid pH regulator added from the raw material liquid pH regulator reservoir unit to the raw material liquid in the raw material liquid pH adjustment place, and the extraction system further comprises: a raw material liquid pH sensor that detects pH of one of the raw material liquid in the raw material liquid tank and the raw material liquid in the raw material liquid return path; and a controller that causes the raw material liquid pH regulator addition adjusting unit to adjust an amount of addition of the raw material liquid pH regulator so that a detected pH value of the raw material liquid approaches a raw material liquid pH optimum value set in advance, the detected pH value being pH of the raw material liquid detected by the raw material liquid pH sensor.

3 . The extraction system according to claim 2 , further comprising a raw material liquid pH regulator index value detector that detects a raw material liquid pH regulator index value that is an index value for an amount of addition of the raw material liquid pH regulator added from the raw material liquid pH regulator reservoir unit to the raw material liquid in the raw material liquid pH adjustment place,
wherein the controller calculates a necessary amount of regulator addition to the raw material liquid and causes the raw material liquid pH regulator addition adjusting unit to adjust an amount of addition of the raw material liquid pH regulator so that an amount of addition of the raw material liquid pH regulator that corresponds to the raw material liquid pH regulator index value detected by the raw material liquid pH regulator index value detector matches the necessary amount of regulator addition to the raw material liquid, the necessary amount being an amount of addition of the raw material liquid pH regulator that needs to be added to the raw material liquid in order to match the detected pH value of the raw material liquid to the raw material liquid pH optimum value.

4 . The extraction system according to claim 2 , wherein the raw material liquid pH sensor detects pH of the raw material liquid in the raw material liquid return path.

5 . The extraction system according to claim 4 , wherein
the raw material liquid return path has a raw material liquid pH regulator addition point connected to the raw material liquid pH regulator addition apparatus, the raw material liquid pH regulator addition point being a point at which the raw material liquid pH regulator addition apparatus adds the raw material liquid pH regulator to the raw material liquid in the raw material liquid return path, and the raw material liquid pH sensor detects pH of the raw material liquid at a point on the raw material liquid return path, the point being upstream of the raw material liquid pH regulator addition point in a direction of flow of the raw material liquid in the raw material liquid return path.

6 . The extraction system according to claim 4 , wherein
the raw material liquid return path has a raw material liquid pH regulator addition point connected to the raw material liquid pH regulator addition apparatus, the raw material liquid pH regulator addition point being a point at which the raw material liquid pH regulator addition apparatus adds the raw material liquid pH regulator to the raw material liquid in the raw material liquid return path, and the raw material liquid pH sensor detects pH of the raw material liquid at a point on the raw material liquid return path, the point being downstream of the raw material liquid pH regulator addition point in a direction of flow of the raw material liquid in the raw material liquid return path.

7 . The extraction system according to claim 1 , further comprising:
a raw material liquid feed pump that operates to pump the raw material liquid out of the raw material liquid tank and send the raw material liquid to the extractor; an extraction liquid feed pump that operates to pump the extraction liquid out of the extraction liquid tank and send the extraction liquid to the extractor; a pre-extraction pH sensor that detects pH of the raw material liquid having the raw material liquid pH regulator added to the raw material liquid by the raw material liquid pH regulator addition apparatus but not subjected to an extraction treatment at the extractor yet; a post-extraction pH sensor that detects pH of the raw material liquid having been subjected to the extraction treatment at the extractor but not having the raw material liquid pH regulator added to the raw material liquid by the raw material liquid pH regulator addition apparatus yet; and a controller that controls operations of the raw material liquid feed pump and the extraction liquid feed pump, wherein when a pre-extraction/post-extraction pH difference is larger than a raw material liquid pH difference specified value set in advance, the controller causes the raw material liquid feed pump and the extraction liquid feed pump to keep operating, and when the pre-extraction/post-extraction pH di

Assignees

• Kobe Steel Ltd

Inventors

• Matsuoka Akira
• Noishiki Koji

Classifications

• B01D11/0492

  Applications, solvents used · CPC title

• B01D11/0453

  with narrow passages limited by plates, walls, e.g. helically coiled tubes (B01D11/0461 takes precedence) · CPC title

• B01D11/0496

  by extraction in microfluidic devices · CPC title

• B01D11/0484 Primary

  Controlling means · CPC title

• B01D11/0488

  Flow sheets · CPC title