JP7798656B2 - Valuable metal recovery methods - Google Patents
Valuable metal recovery methodsInfo
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- JP7798656B2 JP7798656B2 JP2022061734A JP2022061734A JP7798656B2 JP 7798656 B2 JP7798656 B2 JP 7798656B2 JP 2022061734 A JP2022061734 A JP 2022061734A JP 2022061734 A JP2022061734 A JP 2022061734A JP 7798656 B2 JP7798656 B2 JP 7798656B2
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Description
本発明は、有価金属を含有する被処理水から有価金属を回収する方法に係り、有価金属回収用組成物の添加により有価金属を可溶化状態のまま膜処理で回収する方法に関する。 The present invention relates to a method for recovering valuable metals from water to be treated that contains valuable metals, and relates to a method for recovering valuable metals in a solubilized state through membrane treatment by adding a valuable metal recovery composition.
有価金属を含む被処理水から有価金属を回収することは、資源の有効活用だけでなく、水質基準を満たし環境負荷を低減するためにも重要である。被処理水からの有価金属回収の一般的な方法として、有価金属を不溶化して固液分離する中和凝集沈殿法が広く用いられ、高い水質の処理水を得るために固液分離に膜処理を用いた方法が種々検討されている。
中和凝集沈殿法では、有価金属の不溶性水酸化物の凝集物が微細なため、沈降速度低下による沈殿分離能の低下や、処理水への不溶性水酸化物の混入が問題となる。そのため、凝集剤を添加して不溶性水酸化物の凝集物の粒形を大きくし、沈降速度を上げる対策が行われる。しかしながら、凝集剤添加により含水率の高い不溶性水酸化物の凝集物が大量に発生し、回収効率や凝集物の処理が課題となる。
特開２０１０－２８４５９３は、中和凝集沈殿法における大量の不溶性水酸化物の凝集物発生の抑制を課題とし、固液分離後にＲＯ膜分離工程と晶析工程を組み合わせることで、メッキ洗浄排水からの金属回収効率を向上させている。
特開２００６－３２０８６２は、処理水を排水せずに、ろ過装置の通過後であってろ過前の無機性廃水をろ過装置より上流側に所定時間循環させることにより、不溶性水酸化物の凝集物をケーキ層として堆積させて微細な不純物を捕捉し、金属除去能力を向上させた処理方法を開示している。
また、特開２００８－２５３９５４は、固液分離において膜内外表面の堆積物の蓄積による膜間差圧上昇の抑制を課題とし、鉄を含む被処理水に鉄濃度を下げる薬剤を投入して溶解性鉄濃度を管理することで長期間安定して処理する方法を開示している。
Recovering valuable metals from wastewater containing them is important not only for the effective use of resources but also for meeting water quality standards and reducing environmental impact. As a general method for recovering valuable metals from wastewater, the neutralization coagulation sedimentation method, which insolubilizes valuable metals and separates them into solids and liquids, is widely used, and various methods using membrane treatment for solid-liquid separation are being investigated in order to obtain treated water of high quality.
In the neutralization coagulation sedimentation method, the aggregates of insoluble hydroxides of valuable metals are very fine, which can lead to problems such as a decrease in sedimentation speed, which reduces the ability to separate the precipitation, and the contamination of the treated water with insoluble hydroxides. Therefore, measures are taken to increase the particle size of the aggregates of insoluble hydroxides by adding a coagulant, thereby increasing the sedimentation speed. However, the addition of a coagulant generates a large amount of aggregates of insoluble hydroxides with a high water content, which poses challenges to recovery efficiency and disposal of the aggregates.
Japanese Patent Application Laid-Open No. 2010-284593 addresses the issue of suppressing the generation of large amounts of insoluble hydroxide aggregates in the neutralization coagulation sedimentation method, and improves the efficiency of metal recovery from plating cleaning wastewater by combining an RO membrane separation process and a crystallization process after solid-liquid separation.
Japanese Patent Application Laid-Open No. 2006-320862 discloses a treatment method in which, without discharging the treated water, inorganic wastewater that has passed through a filtration device but has not yet been filtered is circulated upstream of the filtration device for a predetermined period of time, thereby depositing aggregates of insoluble hydroxides as a cake layer to capture fine impurities and improve metal removal capacity.
Furthermore, Japanese Patent Application Laid-Open No. 2008-253954 addresses the issue of suppressing an increase in transmembrane pressure due to the accumulation of deposits on the inner and outer surfaces of a membrane during solid-liquid separation, and discloses a method for stable treatment over a long period of time by adding an agent for lowering the iron concentration to the iron-containing water to be treated and controlling the soluble iron concentration.
中和凝集沈殿法では中和沈殿のために多くの工程と多種の薬剤が必要であり、作業工程が複雑かつ煩雑である。また、被処理水から使用した多種の薬剤の影響を除くためのさらなる処理や、回収した不溶化状態の有価金属に対し再活用のための処理が必要であり、有価金属回収後にも繁雑な手段を要する。
本発明は、有価金属回収用組成物の添加により有価金属を可溶化状態のまま膜処理で回収する方法を提供する。膜を透過した水溶液は有価金属の濃度を水質基準以下に低減させるため、メッキ廃水など金属を含む廃液処理に活用することも可能である。
The neutralization coagulation sedimentation method requires many steps and various chemicals for neutralization and precipitation, making the process complicated and tedious.Furthermore, further treatment is required to remove the effects of the various chemicals used from the treated water, and treatment is required for the reuse of the recovered insoluble valuable metals, requiring complicated procedures even after the valuable metals are recovered.
The present invention provides a method for recovering valuable metals in a solubilized state by adding a valuable metal recovery composition to a membrane treatment. The concentration of valuable metals in the aqueous solution that passes through the membrane is reduced to below the water quality standard, making it possible to use the method for treating wastewater containing metals, such as plating wastewater.
上記課題を解決するため、本発明には以下の構成が含まれる。
有価金属を含有する水溶液と、タンパク質やペプチドと炭酸水素イオン及び／または炭酸イオンを含む有価金属回収用組成物、あるいはその水溶液を混合する。これにより、有価金属とタンパク質やペプチドを含む複合体を形成させ、この複合体を含む水溶液を膜分離処理することで、有価金属を可溶化状態のまま回収することを可能とする。この方法を用いることで、有価金属の濃度を著しく高めた水溶液と、有価金属の濃度を法令に定められた水質基準以下まで低下させた水溶液が得られる。
In order to solve the above problems, the present invention includes the following configurations.
An aqueous solution containing valuable metals is mixed with a valuable metal recovery composition containing proteins or peptides and bicarbonate ions and/or carbonate ions, or with an aqueous solution of such a composition. This forms a complex containing the valuable metals and proteins or peptides, and the aqueous solution containing this complex is then subjected to membrane separation, allowing the valuable metals to be recovered in a solubilized state. This method can produce an aqueous solution with a significantly increased concentration of valuable metals, or an aqueous solution in which the concentration of valuable metals has been reduced to below the water quality standards set by law.
本発明は、有価金属を可溶化状態のまま膜処理で回収する方法を提供するものである。
被処理水を膜分離処理することで可溶化状態の有価金属の濃度を著しく高めた水溶液が得られるため、有価金属再活用のための処理の負担が軽減する。
本発明は有価金属回収用組成物の添加と膜分離処理からなる有価金属の回収方法であり、回収工程が少ないために、回収方法を新規に採用するにあたり設備導入を最小限に抑えることができる。有価金属回収用組成物はタンパク質やペプチドと食品添加物である炭酸水素ナトリウムを使用する事もできるため、環境負荷を低減した有価金属の回収方法を提供する。さらに、膜を透過した水溶液は有価金属の濃度が水質基準以下に低減するため、金属を含む廃液処理に活用することも可能である。
The present invention provides a method for recovering valuable metals in a solubilized state by membrane treatment.
By subjecting the water to membrane separation treatment, an aqueous solution with a significantly increased concentration of solubilized valuable metals can be obtained, reducing the burden of treatment required for the reuse of valuable metals.
The present invention provides a valuable metal recovery method that involves the addition of a valuable metal recovery composition and membrane separation treatment. Because the recovery process involves fewer steps, it is possible to minimize the need for new equipment when adopting a new recovery method. The valuable metal recovery composition can also contain proteins, peptides, and sodium bicarbonate, a food additive, providing a valuable metal recovery method with reduced environmental impact. Furthermore, because the concentration of valuable metals in the aqueous solution that passes through the membrane is reduced to below water quality standards, the method can also be used to treat wastewater containing metals.
本発明の被処理水からの有価金属の回収方法について以下に詳細に説明する。
有価金属回収用組成物は、タンパク質やペプチド及び炭酸水素イオン及び／または炭酸イオンを含有することを特徴とする。有価金属の一つである鉄は、炭酸水素イオン及び／または炭酸イオンの存在下でタンパク質やペプチドと複合体を形成することが知られている。
有価金属回収用組成物としてタンパク質やペプチド及び炭酸水素イオン及び／または炭酸イオンを溶解した水溶液を調製する。
有価金属を含有する被処理水に、有価金属回収用組成物の水溶液を添加する。これにより、有価金属とタンパク質やペプチドが複合体を形成するため、この複合体を含む溶液を膜分離処理すると有価金属は膜を透過せず濃縮液側に留まる。有価金属の可溶化状態を保つには、被処理水に有価金属回収用組成物を添加した後の水溶液において、タンパク質やペプチド素材の濃度が０．０２５～１０％、好ましくは０．０５％～４％、より好ましくは０．１２５～２％に対し、炭酸水素ナトリウム濃度を０．５～１３．４ｇ／Ｌ、好ましくは１．０～６．７ｇ／Ｌ、より好ましくは１．７～３．４ｇ／Ｌとする。
有価金属の透過を防ぐには、有価金属と有価金属回収用組成物を含む被処理水に対し、限外濾過膜を使用すれば良い。使用する限外濾過膜の膜孔径は５００ｋＤａ以下、好ましくは３００ｋＤａ以下、より好ましくは１００ｋＤａ以下であれば良い。
使用する膜の材質は、ポリスルフォン、ポリエーテルスルフォン、４フッ化エチレン、セラミックや、酢酸セルロース、ニトロセルロース、ポリアクリロニトリル、芳香族ポリアミド等の親水性の膜、あるいは荷電膜を例示することができる。
本発明の有価金属の回収に関わる膜処理法は、有価金属回収、水質浄化、製造等で一般的に用いられている方法であればどのようなものでもよく、クロスフロー方式での濾過処理等を例示できる。この方法により、有価金属の濃度を著しく高めた水溶液と、有価金属の濃度を法令に定められた水質基準以下まで低下させた水溶液を得ることが可能である。
なお、膜処理中の溶液の温度調整は、使用する膜の種類が対応可能な温度で実施すれば良い。
なお、回収する有価金属としては、鉄の他に、銅、亜鉛、銀などが挙げられる。これらの有価金属の状態としては、有価金属が可溶化状態で含まれる水溶液であればよく、不溶化した状態であっても事前に塩酸や硫酸等で可溶化の状態にすれば良い。
本発明のタンパク質としては、タンパク質を含む素材であればどのような由来のものであっても良く、動物由来のタンパク質のほか、植物由来のタンパク質、菌体由来のタンパク質が挙げられる。また、これらのタンパク質を酵素分解したペプチドも使用できる。
炭酸水素イオン及び／または炭酸イオンは、水溶液中で炭酸イオン及び／または炭酸水素イオンを生じるものであればどのような成分や方法を用いて生成させてもよく、以下に例示した１種類あるいは複数の化合物及び／または方法を組み合わせて炭酸イオン及び／または炭酸水素イオンを生じさせればよい。
気体状の二酸化炭素の吹き込み、液状あるいは固体状の二酸化炭素の添加といった二酸化炭素を添加する方法、炭酸水素ナトリウム、炭酸水素カリウム、炭酸水素カルシウム、炭酸水素アンモニウムなどの炭酸水素塩を添加する方法や、炭酸ナトリウム、炭酸カリウム、炭酸アンモニウム、炭酸カルシウムなどの炭酸塩を添加する方法等が例示できる。
The method for recovering valuable metals from water to be treated according to the present invention will be described in detail below.
The composition for recovering valuable metals is characterized by containing proteins or peptides and bicarbonate ions and/or carbonate ions. Iron, one of the valuable metals, is known to form a complex with proteins or peptides in the presence of bicarbonate ions and/or carbonate ions.
An aqueous solution containing a protein or peptide and hydrogen carbonate ions and/or carbonate ions dissolved therein is prepared as a composition for recovering valuable metals.
An aqueous solution of a valuable metal recovery composition is added to water to be treated that contains valuable metals. This causes the valuable metals to form complexes with proteins or peptides. When a solution containing these complexes is subjected to membrane separation, the valuable metals do not pass through the membrane and remain in the concentrate. To maintain the solubilization of the valuable metals, the aqueous solution obtained after adding the valuable metal recovery composition to the water to be treated has a protein or peptide material concentration of 0.025 to 10%, preferably 0.05 to 4%, and more preferably 0.125 to 2%, and a sodium bicarbonate concentration of 0.5 to 13.4 g/L, preferably 1.0 to 6.7 g/L, and more preferably 1.7 to 3.4 g/L.
To prevent the permeation of valuable metals, an ultrafiltration membrane may be used for the water to be treated containing the valuable metals and the valuable metal recovery composition. The pore size of the ultrafiltration membrane used may be 500 kDa or less, preferably 300 kDa or less, and more preferably 100 kDa or less.
Examples of the material of the membrane to be used include hydrophilic membranes such as polysulfone, polyethersulfone, tetrafluoroethylene, ceramic, cellulose acetate, nitrocellulose, polyacrylonitrile, and aromatic polyamide, and charged membranes.
The membrane treatment method for recovering valuable metals of the present invention may be any method commonly used in valuable metal recovery, water purification, production, etc., and examples thereof include cross-flow filtration treatment, etc. This method makes it possible to obtain an aqueous solution with a significantly increased concentration of valuable metals and an aqueous solution with a reduced concentration of valuable metals below the water quality standards set by law.
The temperature of the solution during membrane treatment may be adjusted to a temperature that is compatible with the type of membrane used.
In addition to iron, valuable metals to be recovered include copper, zinc, silver, etc. The state of these valuable metals may be an aqueous solution containing the valuable metals in a solubilized state, and even if they are in an insolubilized state, they may be solubilized in advance with hydrochloric acid, sulfuric acid, or the like.
The protein of the present invention may be derived from any protein-containing material, including animal-derived proteins, plant-derived proteins, and bacterial-derived proteins. Peptides obtained by enzymatic hydrolysis of these proteins can also be used.
The bicarbonate ions and/or carbonate ions may be generated using any components and any method as long as they generate carbonate ions and/or bicarbonate ions in an aqueous solution. Carbonate ions and/or bicarbonate ions may be generated by combining one or more compounds and/or methods exemplified below.
Examples of the method include a method of adding carbon dioxide such as blowing in gaseous carbon dioxide or adding liquid or solid carbon dioxide; a method of adding a bicarbonate such as sodium bicarbonate, potassium bicarbonate, calcium bicarbonate, or ammonium bicarbonate; and a method of adding a carbonate such as sodium carbonate, potassium carbonate, ammonium carbonate, or calcium carbonate.
以下、本発明の実施例を詳細に説明するが、本発明はこれらに限定されるものではない。 Examples of the present invention are described in detail below, but the present invention is not limited to these examples.
［実施例１］
鉄濃度が１００ｍｇ／Ｌである塩化第二鉄水溶液を被処理水とし、その水溶液と同量の有価金属回収用組成物水溶液を添加した。添加後の有価金属回収用組成物濃度は、炭酸水素カリウム１．７ｇ／Ｌ、乳タンパク質素材（ＷＰＩ８８５５（フォンテラ社））０．１２５％とした。鉄水溶液に有価金属回収用組成物を添加することで、鉄とタンパク質を含む複合体が形成され、鉄の沈殿物が生じないことを確認した。
この複合体を含む被処理水４ｍＬを、遠心式５０ｋＤａ膜を用い４０００×ｇで濃縮液を２ｍＬ得るまで遠心して膜分離処理をした（２倍濃縮）。
その後、膜分離処理前の被処理水、膜分離処理後の濃縮液、透過液に含まれる鉄濃度を測定すると、透過液では鉄が検出されなかった。なお、本発明において鉄の測定はニトロソＰＳＡＰ法による。
[Example 1]
An aqueous solution of ferric chloride with an iron concentration of 100 mg/L was used as the water to be treated, and an aqueous solution of a valuable metal recovery composition in the same volume as the aqueous solution was added. The concentration of the valuable metal recovery composition after addition was 1.7 g/L of potassium bicarbonate and 0.125% of a milk protein material (WPI8855 (Fonterra)). It was confirmed that adding the valuable metal recovery composition to the aqueous iron solution formed a complex containing iron and protein, and no iron precipitate was formed.
4 mL of the water to be treated containing this complex was centrifuged at 4000×g using a centrifugal 50 kDa membrane to obtain 2 mL of concentrate, thereby subjecting the water to membrane separation treatment (2-fold concentration).
Thereafter, the iron concentrations in the water to be treated before membrane separation treatment, the concentrate after membrane separation treatment, and the permeate were measured. No iron was detected in the permeate. In the present invention, iron was measured by the nitroso-PSAP method.
［比較例１］
炭酸水素カリウムを添加しなかったこと以外は、実施例１と同様の条件で溶液添加と膜分離処理をし、鉄濃度測定を行ったところ、透過液において１７ｍｇ／Ｌの鉄が検出され、回収率は７７．１％であった。
[Comparative Example 1]
Solution addition and membrane separation treatment were carried out under the same conditions as in Example 1, except that potassium bicarbonate was not added. When the iron concentration was measured, 17 mg/L of iron was detected in the permeate, and the recovery rate was 77.1%.
［実施例２］
実施例１と同様の方法で調製した複合体を含む被処理水５００ｍＬを、クロスフロー式５０ｋＤａ膜を用いて膜分離処理をし、透過液を４５０ｍＬ得た（１０倍濃縮）。その後、膜分離処理前の被処理水、膜分離処理後の濃縮液、透過液に含まれる鉄濃度測定を行うと、透過液でのみ鉄が検出されなかった。
[Example 2]
500 mL of water to be treated containing the complex prepared in the same manner as in Example 1 was subjected to membrane separation treatment using a cross-flow 50 kDa membrane to obtain 450 mL of permeate (10-fold concentrated). The iron concentrations in the water to be treated before membrane separation treatment, the concentrated liquid after membrane separation treatment, and the permeate were then measured. Iron was not detected in the permeate only.
［実施例３］
酵母由来のペプチド素材（ＢＤ社）０．５％水溶液を調製し、これを有価金属回収用組成物のペプチド水溶液とした。実施例１と同様の濃度条件となるよう、塩化第二鉄水溶液に有価金属回収用組成物を添加することで、酵母由来のペプチドと鉄の複合体を含む溶液を調製し、沈殿が生じないことを確認した。
複合体を含む被処理水４ｍＬを、遠心式３ｋＤａ膜を用いて実施例１と同様の条件で２倍濃縮をして鉄濃度測定を行ったところ、透過液において鉄は検出されなかった。
[Example 3]
A 0.5% aqueous solution of yeast-derived peptide material (BD) was prepared and used as the aqueous peptide solution of the valuable metal recovery composition. The valuable metal recovery composition was added to an aqueous ferric chloride solution to achieve the same concentration conditions as in Example 1, thereby preparing a solution containing a yeast-derived peptide and iron complex, and it was confirmed that no precipitation occurred.
4 mL of the water to be treated containing the complex was concentrated twice using a centrifugal 3 kDa membrane under the same conditions as in Example 1, and the iron concentration was measured. No iron was detected in the permeate.
［実施例４］
亜鉛濃度が１００ｍｇ／Ｌである酢酸亜鉛水溶液を被処理水とし、有価金属回収用組成物の水溶液を添加した。調製後の有価金属回収用組成物濃度は、炭酸ナトリウム３．４ｇ／Ｌ、乳タンパク質素材（ＷＰＩ８８５５（フォンテラ社））２％とした。これにより、亜鉛とタンパク質を含む複合体が形成され、亜鉛の沈殿が生じないことを確認した。
この複合体を含む被処理水４ｍＬを、遠心式１０ｋＤａ膜を用いて実施例１と同様の条件で２倍濃縮をして亜鉛濃度測定を行ったところ、亜鉛の回収率は９８．９％であった。なお、本発明において亜鉛の測定は５－Ｂｒ－ＰＡＰＳを用いた直接法による。
[Example 4]
An aqueous solution of a valuable metal recovery composition was added to a zinc acetate solution with a zinc concentration of 100 mg/L as the treatment water. The concentration of the valuable metal recovery composition after preparation was 3.4 g/L of sodium carbonate and 2% of a milk protein material (WPI8855 (Fonterra)). It was confirmed that this formed a complex containing zinc and protein, and that no zinc precipitation occurred.
When 4 mL of the water to be treated containing this complex was concentrated twice using a centrifugal 10 kDa membrane under the same conditions as in Example 1 and the zinc concentration was measured, the zinc recovery rate was 98.9%. In the present invention, zinc is measured by a direct method using 5-Br-PAPS.
［実施例５］
銅濃度が１００ｍｇ／Ｌである硫酸銅水溶液を被処理水とし、有価金属回収用組成物の水溶液を添加した。調製後の有価金属回収用組成物濃度は、炭酸水素ナトリウム３．４ｇ／Ｌ、大豆タンパク質素材（ロケット社）２％とした。これにより、銅とタンパク質を含む複合体が形成され、銅の沈殿が生じないことを確認した。
銅の複合体を含む被処理水４ｍＬを、遠心式１０ｋＤａ膜を用いて実施例１と同様の条件で２倍濃縮をして銅濃度測定を行ったところ、銅の回収率は９９．５％であった。なお、本発明において銅の測定はＤｉＢｒ－ＰＡＥＳＡを用いた直接法による。
[Example 5]
An aqueous solution of copper sulfate with a copper concentration of 100 mg/L was used as the water to be treated, and an aqueous solution of a valuable metal recovery composition was added. The concentration of the valuable metal recovery composition after preparation was 3.4 g/L of sodium bicarbonate and 2% soy protein material (Rocket Co.). It was confirmed that this formed a complex containing copper and protein, and that no copper precipitation occurred.
When 4 mL of the water to be treated containing copper complexes was concentrated twice using a centrifugal 10 kDa membrane under the same conditions as in Example 1 and the copper concentration was measured, the copper recovery rate was 99.5%. In the present invention, copper was measured by a direct method using DiBr-PAESA.
［実施例６］
実施例１と同様の方法で調製した複合体を含む被処理水５０Ｌを、クロスフロー式５０ｋＤａ膜を用いて膜分離処理をし、透過液を４５Ｌ得た（１０倍濃縮）。その後、膜分離処理前の被処理水、膜分離処理後の濃縮液、透過液に含まれる鉄濃度測定を行うと、透過液でのみ鉄が検出されなかった。
[Example 6]
50 L of water to be treated containing the complex prepared in the same manner as in Example 1 was subjected to membrane separation treatment using a cross-flow 50 kDa membrane, and 45 L of permeate was obtained (10-fold concentrated). After that, the iron concentrations in the water to be treated before membrane separation treatment, the concentrated liquid after membrane separation treatment, and the permeate were measured. Iron was not detected only in the permeate.
［実施例７］
銀濃度が１００ｍｇ／Ｌである硝酸銀水溶液を被処理水とし、有価金属回収用組成物の水溶液を添加した。調製後の有価金属回収用組成物濃度は、炭酸水素ナトリウム１．７ｇ／Ｌ、タンパク質素材（ＷＰＩ８８５５（フォンテラ社））０.２５％とした。これにより、銀とタンパク質を含む複合体が形成され、銀の沈殿が生じないことを確認した。
銀の複合体を含む被処理水４ｍＬを、遠心式５０ｋＤａ膜を用いて実施例１と同様の条件で２倍濃縮をして銀濃度測定を行ったところ、銀の回収率は９１．６％であった。なお、本発明において銀の測定はＰＡＮを用いた直接法による。
[Example 7]
An aqueous solution of silver nitrate with a silver concentration of 100 mg/L was used as the water to be treated, and an aqueous solution of a valuable metal recovery composition was added. The concentration of the valuable metal recovery composition after preparation was 1.7 g/L of sodium bicarbonate and 0.25% of a protein material (WPI8855 (Fonterra)). It was confirmed that this resulted in the formation of a complex containing silver and protein, and that no silver precipitation occurred.
When 4 mL of water to be treated containing a silver complex was concentrated twice using a centrifugal 50 kDa membrane under the same conditions as in Example 1 and the silver concentration was measured, the silver recovery rate was 91.6%. In the present invention, silver was measured by a direct method using PAN.
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| JP2007056308A (en) | 2005-08-24 | 2007-03-08 | Japan Science & Technology Agency | Method for recovering noble metals using peptides |
| WO2011155134A1 (en) | 2010-06-11 | 2011-12-15 | 日本板硝子株式会社 | Fine noble metal particles, method for collecting fine noble metal particles, and method for producing fine noble metal particle dispersion using collected fine noble metal particles |
| WO2017154867A1 (en) | 2016-03-07 | 2017-09-14 | 雪印メグミルク株式会社 | FRACTIONATION METHOD FOR WHEY PROTEIN, PRODUCTION METHOD FOR COMPOSITION INCLUDING α-LACTALBUMIN, AND PRODUCTION METHOD FOR COMPOSITION INCLUDING β-LACTOGLOBULIN |
| JP2020162466A (en) | 2019-03-29 | 2020-10-08 | 雪印メグミルク株式会社 | Method for Producing Iron-Containing Protein Composition |
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| JP2884045B2 (en) * | 1994-03-18 | 1999-04-19 | 雪印乳業株式会社 | Iron-lactoferrin complex and method for producing the same |
| JP3606665B2 (en) * | 1995-12-06 | 2005-01-05 | 雪印乳業株式会社 | Zinc-lactoferrin, its production and use |
| JP3580517B2 (en) * | 1997-03-21 | 2004-10-27 | 雪印乳業株式会社 | Iron casein phosphopeptide complex and method for producing the same |
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| JP2007056308A (en) | 2005-08-24 | 2007-03-08 | Japan Science & Technology Agency | Method for recovering noble metals using peptides |
| WO2011155134A1 (en) | 2010-06-11 | 2011-12-15 | 日本板硝子株式会社 | Fine noble metal particles, method for collecting fine noble metal particles, and method for producing fine noble metal particle dispersion using collected fine noble metal particles |
| WO2017154867A1 (en) | 2016-03-07 | 2017-09-14 | 雪印メグミルク株式会社 | FRACTIONATION METHOD FOR WHEY PROTEIN, PRODUCTION METHOD FOR COMPOSITION INCLUDING α-LACTALBUMIN, AND PRODUCTION METHOD FOR COMPOSITION INCLUDING β-LACTOGLOBULIN |
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