JP5985926B2 - 金属回収方法、および、それに用いられる金属回収装置 - Google Patents
金属回収方法、および、それに用いられる金属回収装置 Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/84—Recycling of batteries or fuel cells
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- Manufacture And Refinement Of Metals (AREA)
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Description
(1)目的金属の酸化物または水酸化物を含む被処理物から、前記目的金属を回収する方法であって、
鉄還元細菌により3価鉄イオンを2価鉄イオンに還元する鉄還元工程と、
前記2価鉄イオンを含む浸出液と被処理物を接触させることで、前記2価鉄イオンにより前記目的金属の酸化物または水酸化物を還元するとともに、前記目的金属を前記浸出液中に浸出させる浸出工程と、
前記浸出工程により前記目的金属が浸出した前記浸出液を、浸出貴液として前記被処理物と分離する固液分離工程と、
前記浸出貴液中の前記目的金属を回収する金属回収工程とを含み、
前記鉄還元工程と前記浸出工程とが別個の反応容器内で実施されることを特徴とする、金属回収方法。
前記鉄還元工程で用いられる第1の反応容器と、前記浸出工程で用いられる前記第1の反応容器とは別個の第2の反応容器とを備える、金属回収装置。
前記鉄還元工程で用いられる第1の反応容器と、前記浸出工程で用いられる第2の反応容器と、
前記鉄還元工程の後に前記鉄還元細菌を分離し、前記鉄還元細菌を含まない浸出液を得るために用いられる細胞分離手段とを含む、金属回収装置。
(1)鉄還元細菌により3価鉄イオンを2価鉄イオンに還元する鉄還元工程と、
(2)前記2価鉄イオンを含む浸出液と被処理物とを接触させることで、前記2価鉄イオンにより前記目的金属の酸化物または水酸化物を還元するとともに、前記目的金属を前記浸出液中に浸出させる浸出工程と、
(3)前記浸出工程により前記目的金属が浸出した前記浸出液を、浸出貴液として前記被処理物と分離する固液分離工程と、
(4)前記浸出貴液中の前記目的金属を回収する金属回収工程とを含み、
前記鉄還元工程と前記浸出工程とが別個の反応容器内で実施されることを特徴とする。
(1)鉄還元工程
本工程では、鉄還元細菌により3価鉄イオンを2価鉄イオンに還元する。
先に図2を参照して、本発明における目的金属の浸出機構(バイオリーチング機構)について説明する。まず、鉄還元細菌は、嫌気性条件下(例えば窒素雰囲気下)で、細胞内酸化・還元反応を起こして、電子供与体(例えばギ酸塩)を酸化し、クエン酸第二鉄(クエン酸鉄(III))等の解離により生じる3価鉄(鉄(III))イオンを還元して2価鉄(鉄(II))イオンを生成する。
上記浸出工程後には、目的金属が浸出した浸出液(浸出貴液)と被処理物残渣との混合物である浸出スラリが生成される。本工程では、この浸出スラリ中の浸出貴液と被処理物残渣とを分離する。
本工程では、浸出貴液中から目的金属を回収する。浸出貴液中からの目的金属の回収方法は特に限定されず、種々公知の方法を用いることができるが、一例として、以下の吸着分離工程および溶離工程を含む方法が挙げられる。
図1に示すように、固液分離工程で分離された液体成分(浸出貴液)は、吸着剤を備える吸着分離器4に送られ、目的金属が吸着剤に吸着される。より具体的には、例えば、鉄イオンを吸着せず目的金属を選択的に吸着する吸着剤に、浸出貴液を所定時間通液し、浸出貴液中の目的金属を吸着させるとともに、浸出貴液から目的金属が分離された浸出残液を得る。
本工程では、吸着分離工程で吸着剤に吸着された目的金属を溶離液により溶離することで、目的金属濃縮液(目的金属を含有する溶離液)を得る。溶離液としては塩酸、硝酸、硫酸などの酸溶液で、所定の濃度に調整したものを用いることができる。溶離工程において吸着剤に通液する溶離液の通液量を、吸着分離工程において吸着剤に通液される浸出貴液の量より少なく設定することで、目的金属濃度が濃化された目的金属濃縮溶液を得ることができる。
鉄還元細菌として、ATCC(American Type Culture Collection)から分譲されたATCC 51181株のS.algaeを準備した。S.algaeの培養は、好気環境下において、TSB(トリプトソイブロス)液体培養液(pH7.2)を用いて室温で行った。12〜16hの回分培養を行った後、培養液から細菌細胞を収穫し、S.algae細胞懸濁液を調製した。
参考例1では、鉄還元細菌の培養(浸出剤のバイオ生産)と、被処理物からの目的金属の浸出とを同じ1つの槽内で行った。なお、本実験は液回分式反応器を用いて実施した。以下、詳細について説明する。
参考例2では、参考例1と同様に、鉄還元細菌の培養と、被処理物からの目的金属の浸出とを同じ1つの槽内で行ったが、被処理物の初期添加量を増加させた。以下、詳細について説明する。
Claims (5)
- 目的金属の酸化物または水酸化物を含む被処理物から、前記目的金属を回収する方法であって、
鉄還元細菌により3価鉄イオンを2価鉄イオンに還元する鉄還元工程と、
前記2価鉄イオンを含む浸出液と被処理物とを接触させることで、前記2価鉄イオンにより前記目的金属の酸化物または水酸化物を還元するとともに、前記目的金属を前記浸出液中に浸出させる浸出工程と、
前記浸出工程により前記目的金属が浸出した前記浸出液を、浸出貴液として前記被処理物と分離する固液分離工程と、
前記浸出貴液中の前記目的金属を回収する金属回収工程とを含み、
前記鉄還元工程と前記浸出工程とが別個の反応容器内で実施され、
前記浸出液は前記鉄還元細菌を含まないことを特徴とする、金属回収方法。 - 前記目的金属は、マンガンおよびリチウムからなる群から選択される少なくとも1種である、請求項1に記載の金属回収方法。
- 少なくとも前記鉄還元工程は嫌気性条件下で行われる、請求項1または2に記載の金属回収方法。
- 請求項1に記載の金属回収方法に用いられる金属回収装置であって、
前記鉄還元工程で用いられる第1の反応容器と、前記浸出工程で用いられる前記第1の反応容器とは別個の第2の反応容器とを備える、金属回収装置。 - 前記鉄還元工程の後に前記鉄還元細菌を分離し、前記鉄還元細菌を含まない浸出液を得るために用いられる細胞分離手段とをさらに備える、請求項4に記載の金属回収装置。
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