JP2024036835A - 金属回収剤、金属回収部材、金属回収液剤及び金属回収方法 - Google Patents
金属回収剤、金属回収部材、金属回収液剤及び金属回収方法 Download PDFInfo
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- JP2024036835A JP2024036835A JP2022141343A JP2022141343A JP2024036835A JP 2024036835 A JP2024036835 A JP 2024036835A JP 2022141343 A JP2022141343 A JP 2022141343A JP 2022141343 A JP2022141343 A JP 2022141343A JP 2024036835 A JP2024036835 A JP 2024036835A
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
Description
まず、本実施形態に係る金属回収剤について説明する。本実施形態に係る金属回収剤は、還元化合物による還元によって金属を析出する。そのため、金属回収剤は、還元剤と言い換えることもできる。金属回収剤は、具体的には、下記化学式(1)で表される還元化合物を備えている。本実施形態に係る還元化合物はクロリン構造を有している。還元化合物は、1種単独で用いてもよく、複数種の還元化合物を混合して用いてもよい。また、還元化合物は、タンパク質などのような物質と複合体を形成しておらず、還元化合物の単体又は混合物であってもよい。
次に、本実施形態に係る金属回収部材について説明する。本実施形態に係る金属回収部材は、上述した金属回収剤と、金属回収剤を担持する担体とを備えている。本実施形態に係る金属回収部材では、金属回収剤は担体に担持されているため、金属回収剤の扱いが容易になる。例えば、金属回収部材を金属が溶解している金属溶液に接触させることにより、容易に金属溶液中の金属を回収することができる。
次に、本実施形態に係る金属回収液剤について説明する。本実施形態に係る金属回収液剤は、液体と、液体に分散又は溶解した上記金属回収剤とを備えている。本実施形態に係る金属回収液剤では、金属回収剤が液体に分散又は溶解しているため、金属回収剤の扱いが容易になる。例えば、金属回収液剤と金属が溶解している金属溶液とを混合することにより、容易に金属溶液中の金属を回収することができる。
次に、本実施形態に係る金属回収方法について説明する。本実施形態に係る金属回収方法は、上記化学式(1)で表される還元化合物により、金属溶液に溶解している金属を還元して析出する工程を含んでいる。そのため、本実施形態に係る金属回収方法によれば、上述のように、人為的にコントロールされた環境下で金属を回収することができる。
金濃度が質量比で100ppm(Au含有量10mg)となるように、300mLのビーカー内で水と富士フイルム和光純薬株式会社製のテトラクロロ金(III)酸四水和物(HAuCl4・4H2O)とを混合し、100mLのHAuCl4水溶液を調製した。このHAuCl4水溶液に50mgのクロロフィルa(富士フイルム和光純薬株式会社製、品番034-21361)(CAS登録番号が479-61-8)を添加し、pH5程度の調製液を得た。
クロロフィルaに代えてフェオホルビドa(Cayman Chemical社製、品番16072)(CAS登録番号が15664-29-6)を使用した以外は実施例1と同様の手順で試験液を採取した。
クロロフィルaに代えてピロフェオホルビドa(Cayman Chemical社製、品番21371)(CAS登録番号が24533-72-0)を使用した以外は実施例1と同様の手順で試験液を採取した。
クロロフィルaに代えてフェオフィチンa(富士フイルム和光純薬株式会社製、品番167-13771)(CAS登録番号が603-17-8)を使用した以外は実施例1と同様の手順で試験液を採取した。
クロロフィルa添加しなかった以外は実施例1と同様の手順で試験液を採取した。
実施例1で調製したクロロフィルaを添加する前のHAuCl4水溶液を試験液とした。
上記のようにして得られた試験液を、紫外・可視分光法によって測定した。紫外・可視分光法によって得られたスペクトルを図1に示す。図1に示すように、HAuCl4に特有な波長310nm付近のピークは、比較例1及び参考例1よりも実施例1~実施例4の方が小さくなった。この結果から、実施例1~実施例4では、HAuCl4水溶液中の金が還元されて析出したことが分かる。一方、比較例1と参考例1のスペクトルは、ほぼ重なっており、見分けることが困難であった。この結果から、比較例1では、HAuCl4水溶液中の金がほとんど還元されていないことが分かる。
金回収率(%)=(実施例及び比較例における波長310nm付近のピークの吸光度/参考例1における波長310nm付近のピークの吸光度)×100 (1)
Claims (9)
- 前記還元化合物は、クロロフィルa、フェオホルビドa、ピロフェオホルビドa及びフェオフィチンaからなる群より選択される少なくとも一種である、請求項1に記載の金属回収剤。
- 前記金属の標準電極電位はアルミニウムの標準電極電位以上である、請求項1又は2に記載の金属回収剤。
- 前記金属は、金、銀、銅、スズ、コバルト、鉄、シリコン、ニッケル、白金、パラジウム、ロジウム、イリジウム、ルテニウム、オスミウム、ストロンチウム、マンガン、セシウム、スカンジウム、イットリウム及びランタノイドからなる群より選択される少なくとも一種を含む、請求項1又は2に記載の金属回収剤。
- 前記金属は金を含む、請求項1又は2に記載の金属回収剤。
- 請求項1又は2に記載の金属回収剤と、
前記金属回収剤を担持する担体と、
を備える、金属回収部材。 - 液体と、
前記液体に分散又は溶解した請求項1又は2に記載の金属回収剤と、
を備える、金属回収液剤。 - 前記金属を還元する工程では、前記還元化合物に光が照射される、請求項8に記載の金属回収方法。
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