Acidic treatment liquid processing apparatus, acidic treatment liquid processing method, surface treatment system, and surface treatment method

Patent metadata

Field	Value
Publication number	US-12371799-B2
Application number	US-201917284522-A
Country	US
Kind code	B2
Filing date	Aug 26, 2019
Priority date	Feb 26, 2018
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

An acidic treatment liquid processing apparatus includes: a tank having an interior space; a diaphragm permeable to a metal cation and separating the interior space of the tank into a first chamber and a second chamber; a first electrode disposed in the first chamber; a second electrode disposed in the second chamber; a power supply configured to apply a voltage while using the first electrode as an anode and the second electrode as a cathode; a first liquid passing part configured to pass an acidic treatment liquid containing a dichromate ion and a metal cation into the first chamber; and a second liquid passing part configured to pass an acid aqueous solution into the second chamber.

First claim

The invention claimed is:

1. An acidic treatment liquid processing method, comprising:
passing an acidic treatment liquid containing a dichromate ion and a metal cation into a first chamber separated from a second chamber by a diaphragm permeable to a metal cation, and passing an acid aqueous solution into the second chamber;
applying a voltage while using a first electrode disposed in the first chamber as an anode and a second electrode disposed in the second chamber as a cathode to move a metal cation in the acidic treatment liquid to the acid aqueous solution through the diaphragm; and
measuring, during applying a voltage to the first electrode and the second electrode, a temperature of the acidic solution in the second chamber using a sensor,
wherein, in response to a determination that the diaphragm breaks based on a measurement result of the sensor, the applying of the voltage and the passing of the acidic treatment liquid are stopped.

2. The acidic treatment liquid processing method according to claim 1 , comprising additionally supplying the acid aqueous solution from outside to a circulation passage configured to circulate a predetermined amount of the acid aqueous solution in the second chamber.

3. The acidic treatment liquid processing method according to claim 2 ,
wherein the additional supply amount of the acid aqueous solution is controlled such that a voltage between the first electrode and the second electrode is not greater than a predetermined voltage value.

4. The acidic treatment liquid processing method according to claim 2 , wherein the additional supply of the acid aqueous solution starts when a cumulative energization time of the power supply exceeds a predetermined time.

5. The acidic treatment liquid processing method according to claim 2 , wherein the additional supply of the acid aqueous solution starts when a cumulative energization amount of the power supply exceeds a predetermined energization amount.

6. The acidic treatment liquid processing method according to claim 2 , further comprising passing the acidic treatment liquid into the second chamber.

7. The acidic treatment liquid processing method according to claim 6 ,
wherein the acidic treatment liquid is passed into the second chamber when a precipitate on the second electrode exceeds a predetermined amount.

8. A surface treatment method, comprising:
performing surface treatment of a metallic material using an acidic treatment liquid containing a dichromate ion;
processing the acidic treatment liquid which has been used for the surface treatment and contains a dichromate ion and a metal cation by the acidic treatment liquid processing method according to claim 1 ; and
reusing the acidic treatment liquid processed by the acidic treatment liquid processing method for the surface treatment.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Imasaka Koji
• Mikawa Hiroaki
• Kawasaki Kohei
• Ishigaki Mitsuhiro
• Nagai Masahiko
• Tajima Hidehiko
• Ureshino Ayako
• Egawa Kaoru
• Sakanishi Akihiro
• Miyazaki Taisuke

Classifications

• C02F1/4693

  electrodialysis · CPC title

• C23C22/86

  Regeneration of coating baths · CPC title

• C23C22/24 Primary

  containing hexavalent chromium compounds · CPC title

• B01D2311/2684

  Electrochemical processes · CPC title

• B01D2311/2532

  to concentrate side · CPC title