JP2009228094A - Method for leaching copper-sulfide ore using mixed bacteria - Google Patents

Method for leaching copper-sulfide ore using mixed bacteria Download PDF

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JP2009228094A
JP2009228094A JP2008077796A JP2008077796A JP2009228094A JP 2009228094 A JP2009228094 A JP 2009228094A JP 2008077796 A JP2008077796 A JP 2008077796A JP 2008077796 A JP2008077796 A JP 2008077796A JP 2009228094 A JP2009228094 A JP 2009228094A
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copper
leaching
oxidizing bacteria
iron
sulfur
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Rijin Settsu
理仁 攝津
Harue Imagawa
晴絵 今川
Noritaka Taniguchi
能敬 谷口
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Nippon Mining Holdings Inc
Eneos Corp
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Nippon Mining and Metals Co Ltd
Nippon Mining Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for efficiently and economically extracting a copper from a primary copper-sulfide ore mainly containing copper-pyrite under condition having the general-purposing in the actual operating level. <P>SOLUTION: The method for leaching out the copper from the copper-sulfide ore is performed, that when the copper is leached out from the copper-sulfide ore containing the copper-pyrite, the leaching solution adjusted into 1.6-<2.5 pH is used and after inoculating sulfur-oxidizing bacteria, propagated in this leaching solution to 1.0×10<SP>8</SP>pieces/mL, at the time of starting the leaching iron oxidizing bacteria is inoculated into this leaching solution to perform the leaching-out of the copper. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、硫黄酸化細菌と鉄酸化細菌とを用いて、硫化銅鉱、特に黄銅鉱などの一次硫化銅鉱から銅を効率良く採取する方法に関する。   The present invention relates to a method for efficiently collecting copper from primary copper sulfide ores such as copper sulfide ores, particularly chalcopyrite using sulfur oxidizing bacteria and iron oxidizing bacteria.

銅鉱石から銅を回収する方法の一つとして知られるＳＸ−ＥＷ法（ＳＸ−ＥＷ：溶媒抽出・電解採取）は、銅鉱石から銅を硫酸などで浸出し、その溶液から銅を有機溶媒で濃縮した後、電解採取により電気銅を得る湿式製錬法である。銅鉱石の湿式製錬に使用される溶媒は硫酸が主流であるため、湿式製錬の対象鉱は硫酸などで容易に溶解する酸化銅鉱に限られていた。しかしながら、酸化銅鉱は硫化銅鉱に比べて一般に鉱量が少ないため、鉱量の多い硫化銅鉱を湿式製錬の対象鉱として用いることが検討されている。   The SX-EW method (SX-EW: solvent extraction / electrowinning), which is known as one of the methods for recovering copper from copper ore, leaches copper from copper ore with sulfuric acid, etc., and uses copper as an organic solvent from the solution. This is a hydrometallurgical method for obtaining electrolytic copper by electrowinning after concentration. Since the solvent used for the hydrometallurgy of copper ore is mainly sulfuric acid, the target ore for hydrometallurgy has been limited to copper oxide ore that dissolves easily with sulfuric acid. However, since copper oxide ore is generally smaller in amount than copper sulfide ore, the use of copper sulfide ore having a large amount of mineral as a target ore for hydrometallurgy has been studied.

湿式製錬による硫化銅鉱の浸出形態としては、硫酸または塩酸を用いた回分攪拌反応による浸出形態、積層体を形成しその頂部から硫酸または塩酸を供給して重力により滴り落ちる液を回収する浸出形態（ヒープリーチング法）などが知られている。しかし、ヒープリーチング法では、浸出に数年を要し、しかも浸出率は非常に低く効率が悪い。また、鉄酸化細菌などの微生物の力を借りて銅を効率よく浸出し、回収する方法（バクテリアリーチング法）も採用されている。バクテリアリーチング法では、鉄酸化細菌によって浸出液中の鉄（II）イオンが強力な酸化剤である鉄（III）イオンに酸化され、この鉄（III）イオンによって鉱石中に含まれる硫黄が酸化されて硫酸が生成し、生成した硫酸によって鉱石中の銅が硫酸銅として溶出される。   As the leaching form of copper sulfide ore by hydrometallurgy, the leaching form by batch stirring reaction using sulfuric acid or hydrochloric acid, and the leaching form in which a laminated body is formed and sulfuric acid or hydrochloric acid is supplied from the top to recover the liquid dripping by gravity (Heap leaching method) is known. However, heap leaching requires several years for leaching, and the leaching rate is very low and the efficiency is poor. In addition, a method (bacteria leaching method) in which copper is efficiently leached and recovered with the help of microorganisms such as iron-oxidizing bacteria is also employed. In the bacterial leaching method, iron (II) ions in the leachate are oxidized by iron-oxidizing bacteria into iron (III) ions, which are strong oxidants, and sulfur contained in the ore is oxidized by these iron (III) ions. Sulfuric acid is generated, and copper in the ore is eluted as copper sulfate by the generated sulfuric acid.

バクテリアリーチング法は、既に斑岩銅鉱床の二次富化帯に存在する輝銅鉱（Ｃｕ２Ｓ），銅藍（ＣｕＳ）等の二次硫化銅鉱に対しては実用化されているが、現在、技術開発の主体は銅資源の中で最も大量に存在する黄銅鉱（ＣｕＦｅＳ２）を含有する一次硫化銅鉱である。 The bacterial leaching method has already been put into practical use for secondary copper sulfide ores such as chalcocite (Cu 2 S) and copper indigo (CuS), which are already present in the secondary enrichment zone of porphyry copper deposits. The main body of technological development is primary copper sulfide ore containing chalcopyrite (CuFeS 2 ) that exists in the largest amount among copper resources.

しかしながら、黄銅鉱は硫酸にはほとんど溶けず、銅の浸出速度が極端に遅いため、浸出速度を上げるため様々な技術が提案されている。例えば、高温加圧処理（特許文献１〜３）、鉄量や3価鉄と2価鉄の比率の調整による一定の酸化還元電位の維持（特許文献４）、浸出液に活性炭と鉄を添加することによる一定の酸化還元電位の維持（特許文献５）、塩化ナトリウムと高塩化物濃度耐性硫黄細菌の添加（特許文献６）などが報告されている。しかしながら、上記の方法はいずれも浸出速度の改善に効果はあるもの、エネルギーや試薬の点でコスト高になるという問題がある。従って、黄銅鉱を含有する一次硫化銅鉱に対する湿式製錬は実用化に至る技術がないのが現状である。   However, chalcopyrite hardly dissolves in sulfuric acid and the leaching rate of copper is extremely slow, so various techniques have been proposed to increase the leaching rate. For example, high-temperature pressure treatment (Patent Documents 1 to 3), maintenance of a constant oxidation-reduction potential by adjusting the amount of iron and the ratio of trivalent iron and divalent iron (Patent Document 4), adding activated carbon and iron to the leachate It has been reported that a constant oxidation-reduction potential is maintained (Patent Document 5), sodium chloride and a high chloride concentration-resistant sulfur bacterium are added (Patent Document 6), and the like. However, all of the above methods are effective in improving the leaching rate, but there is a problem that the cost is high in terms of energy and reagent. Therefore, the present condition is that the hydrometallurgy with respect to the primary copper sulfide ore containing a chalcopyrite does not have a technique which will be practically used.

特許第３０４６９８６号Japanese Patent No. 3046986 特開２００１‐５１５１４５号JP 2001-515145 A 特開２００３‐３２８０５０号JP 2003-328050 A 特開平１０‐２６５８６４号JP-A-10-265864 特開２００５‐１５８６４号JP-A-2005-15864 特開２００８‐３１５０４号JP 2008-31504 A

本発明の課題は、上記のような事情に鑑み、実操業レベルで汎用性のある条件で黄銅鉱を主体とする一次硫化銅鉱から銅を効率良くかつ経済的に採取する方法を提供することにある。   In view of the circumstances as described above, an object of the present invention is to provide a method for efficiently and economically collecting copper from primary copper sulfide ore mainly composed of chalcopyrite under conditions that are versatile at the actual operation level. is there.

本発明者らは、上記課題を解決すべく鋭意研究を重ねた結果、黄銅鉱を含有する一次硫化銅鉱から湿式製錬により銅を採取するに際して、開始時に硫黄酸化細菌のみを浸出液に接種し、接種した硫黄酸化細菌が増殖した後に鉄酸化細菌を接種することによって、銅の浸出率が向上することを見出し、本発明を完成させるに至った。   As a result of repeated earnest studies to solve the above problems, the present inventors inoculated the leachate with only sulfur-oxidizing bacteria at the start when collecting copper by hydrometallurgy from primary copper sulfide ore containing chalcopyrite, By inoculating iron-oxidizing bacteria after the inoculated sulfur-oxidizing bacteria grew, it was found that the copper leaching rate was improved, and the present invention was completed.

すなわち、本発明は、黄銅鉱を含有する硫化銅鉱から銅を浸出するに際し、ｐＨを１．６以上２．５未満に調整した浸出液を用い、該浸出液に浸出開始時に接種した硫黄酸化細菌が１．０×１０８個／ｍＬまで増殖した後、鉄酸化細菌を該浸出液に接種して銅の浸出を行うことを特徴とする、硫化銅鉱からの銅の浸出方法の発明に関する。 That is, the present invention uses a leachate whose pH is adjusted to 1.6 or more and less than 2.5 when copper is leached from copper sulfide ore containing chalcopyrite. The present invention relates to an invention of a method for leaching copper from copper sulfide ore, wherein the leaching solution is inoculated with iron-oxidizing bacteria after growing to 0.0 × 10 8 cells / mL.

本発明によれば、黄銅鉱を含有する硫化銅鉱から銅を常温にて効率よく浸出することが出来る。本発明の方法は、硫黄酸化細菌と鉄酸化細菌の接種量と接種時期を調整することで銅の浸出を高めることが出来るため、簡便かつ経済性に優れ、かつ浸出液から溶媒を用いて銅を採取する際に阻害となる試薬などの添加剤を除去する必要がない。   According to the present invention, copper can be efficiently leached at normal temperature from copper sulfide ore containing chalcopyrite. Since the method of the present invention can enhance copper leaching by adjusting the inoculation amount and inoculation time of sulfur-oxidizing bacteria and iron-oxidizing bacteria, it is simple and excellent in economic efficiency, and copper is removed from the leaching solution using a solvent. It is not necessary to remove an additive such as a reagent that becomes an obstacle when collecting.

また、硫黄酸化細菌は硫黄を硫酸に酸化することができるため、初期から接種することで、硫化銅鉱の浸出反応において副生する硫黄が鉱物表面をコーティングし、鉱石と浸出液の接触を妨げる現象を防ぐことを出来る。さらに、硫黄を硫酸に酸化することで浸出液のｐＨを維持することができるため、ｐＨの上昇による鉄酸化細菌の増殖の阻害を防ぐと共に、ｐＨの上昇に伴い発生する鉄明礬石を代表とする鉄の沈澱を防ぐことがことができる。   In addition, since sulfur-oxidizing bacteria can oxidize sulfur to sulfuric acid, by inoculating it from the beginning, sulfur produced as a by-product in the leaching reaction of copper sulfide ore coats the surface of the mineral and prevents contact between the ore and the leachate. I can prevent it. In addition, since the pH of the leachate can be maintained by oxidizing sulfur to sulfuric acid, the inhibition of the growth of iron-oxidizing bacteria due to an increase in pH is prevented, and iron agate stone that occurs with an increase in pH is representative. Iron precipitation can be prevented.

本発明の硫化銅鉱からの銅を浸出方法は、黄銅鉱を含有する硫化銅鉱から銅を浸出するに際し、ｐＨを１．６以上２．５未満に調整した浸出液を用い、該浸出液に浸出開始時に接種した硫黄酸化細菌が１．０×１０８個／ｍＬまで増殖した後、鉄酸化細菌を該浸出液に接種して銅の浸出を行うことを特徴とする。 The method of leaching copper from the copper sulfide ore according to the present invention uses a leachate whose pH is adjusted to 1.6 or more and less than 2.5 when leaching copper from a copper sulfide ore containing chalcopyrite, and when leaching is started in the leachate. After the inoculated sulfur-oxidizing bacteria have grown to 1.0 × 10 8 cells / mL, iron-oxidizing bacteria are inoculated into the leaching solution, and copper is leached.

本発明の方法の対象鉱である黄銅鉱を含有する硫化銅鉱は、黄銅鉱を主体とする硫化銅鉱であっても、黄銅鉱を一部に含有する硫化銅鉱であってもいずれでもよく、その含量は特に限定はされない。   The copper sulfide ore containing chalcopyrite which is the target ore of the method of the present invention may be copper sulfide ore mainly composed of chalcopyrite or copper sulfide ore partially containing chalcopyrite, The content is not particularly limited.

本発明の方法は、硫酸溶液を浸出液とする銅の湿式製錬であれば、いずれの浸出形態にも用いることができ、例えば、回分攪拌浸出のみならず、鉱石を堆積させた上から硫酸を散布して、銅を硫酸中に浸出させるヒープリーチング、ダンプリーチングのいずれであってもよい。また、浸出は常温で行い、特に加熱などは必要としないが、加熱によって浸出速度を促進させることも可能である。   The method of the present invention can be used in any leaching form as long as it is a copper hydrometallurgy using a sulfuric acid solution as a leachate.For example, not only batch agitation leaching but also sulfuric acid can be added after depositing ore. Either heap leaching or dump leaching may be performed by spraying and leaching copper into sulfuric acid. In addition, leaching is performed at room temperature, and heating or the like is not particularly required, but it is possible to accelerate the leaching rate by heating.

ここで用いられる硫黄酸化細菌は、水系（地下水、排水、海水、河川水、湖沼水等）や土壌において硫黄を酸化して硫酸を産生させる能力を有し、かつ鉄を酸化する能力を持たない菌であれば特に限定されないが、例えば、アシディチオバチルス・チオオキシダンス（Acidithiobacillus thiooxidans）、アシディチオバチルス・カルダス（Acidithiobacillus caldus）が挙げられ、好適には、アシディチオバチルス・スピーシーズ（Acidithiobacillus sp．）TTH-19A株（NITE BP-164）を用いることができる。   The sulfur-oxidizing bacteria used here have the ability to oxidize sulfur to produce sulfuric acid in water systems (groundwater, drainage, seawater, river water, lake water, etc.) and soil, and do not have the ability to oxidize iron Although it will not specifically limit if it is a microbe, For example, Acidithiobacillus thiooxidans (Acidithiobacillus thiooxidans) and Acidithiobacillus caldas (Acidithiobacillus caldus) are mentioned, Preferably, Acidithiobacillus spp. sp.) TTH-19A strain (NITE BP-164) can be used.

硫黄酸化菌は硫酸を生成することにより浸出液のｐＨを維持することができるため、ｐＨの上昇による鉄酸化細菌の増殖の阻害を防ぐと共に、ｐＨの上昇に伴い発生する鉄明礬石を代表とする鉄の沈澱を防ぐことがことができる。   Sulfur-oxidizing bacteria can maintain the pH of the leachate by producing sulfuric acid, thus preventing the inhibition of the growth of iron-oxidizing bacteria due to the increase in pH and representative of iron alumite that occurs with an increase in pH. Iron precipitation can be prevented.

上記硫黄酸化細菌の浸出液への添加量は、特に限定されないが、一般的には、菌濃度が１×１０６〜１×１０７ｃｅｌｌｓ／ｍＬになるように添加する。次いで、該浸出液に浸出開始時に接種した硫黄酸化細菌が１．０×１０８個／ｍＬまで増殖した後、鉄酸化細菌を該浸出液に接種してさらに浸出を行う。 Although the addition amount to the leachate of the said sulfur oxidation bacteria is not specifically limited, Generally, it adds so that a microbe density | concentration may be 1 * 10 < 6 > -1 * 10 < 7 > cells / mL. Next, after sulfur-oxidizing bacteria inoculated into the leachate at the start of leaching grow to 1.0 × 10 8 cells / mL, iron-oxidized bacteria are inoculated into the leachate and further leaching is performed.

ここで用いられる鉄酸化細菌は、水系（地下水、排水、海水、河川水、湖沼水等）や土壌において鉄(II)イオンを酸化し、鉄(III)イオンを産生させる能力を有する菌であれば特に限定されないが、例えばアシディチオバチルス・フェロオキシダンス(Acidithiobacillus ferrooxidans)、レプトスピリラム・フェロオキシダンス（Leptospirillum ferrooxidans）、スルフォバシラス・アシドフィラス（Sulfobacillus acidophilus）などが挙げられ、好適には、アシディチオバチルス・フェロオキシダンス（Acidithiobacillus ferrooxidans) DSM14882株を用いることができる。また、鉄酸化細菌の浸出液への添加量は、特に限定されないが、一般的には菌濃度が１×１０６〜１×１０７ｃｅｌｌｓ／ｍＬになるように添加する。 The iron-oxidizing bacteria used here may be bacteria that have the ability to oxidize iron (II) ions and produce iron (III) ions in water systems (groundwater, drainage, seawater, river water, lake water, etc.) and soil. Although not particularly limited, for example, Acidithiobacillus ferrooxidans, Leptospirillum ferrooxidans, Sulfobacillus acidophilus, etc., preferably, Acidithiobacillus ferrooxidans DSM14882 strain can be used. Moreover, although the addition amount to the leaching solution of iron-oxidizing bacteria is not particularly limited, it is generally added so that the bacterial concentration is 1 × 10 6 to 1 × 10 7 cells / mL.

本発明の方法ではまた、上記の硫黄酸化細菌と鉄酸化細菌の接種量と接種時期の調整に加え、浸出液のｐＨを１．６以上２．５未満に調整する。ｐＨ１．６より低い場合は、硫黄酸化細菌の硫黄酸化能力が阻害され、また、ｐＨ２．５より高い場合は、鉄明礬石（jarosite）の生成などによる浸出反応の阻害が起こるので好ましくない。   In the method of the present invention, the pH of the leachate is adjusted to 1.6 or more and less than 2.5 in addition to the adjustment of the inoculation amount and the inoculation time of the above sulfur oxidation bacteria and iron oxidation bacteria. When the pH is lower than 1.6, the sulfur oxidizing ability of the sulfur-oxidizing bacteria is inhibited, and when the pH is higher than 2.5, the leaching reaction is inhibited due to the formation of jarosite or the like, which is not preferable.

以下、実施例及び比較例により本発明をさらに具体的に説明する。但し、本発明はこれらに限定されるものではない。   Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples. However, the present invention is not limited to these.

（実施例１）
対象鉱として、黄銅鉱を主成分とするカンデラリア産の銅精鉱を用いた。この品位はCu：２８ｍａｓｓ％、Fe：２８ｍａｓｓ％、S：３２ｍａｓｓ％であった。 Example 1
As the target ore, a copper concentrate from Candelaria, which mainly contains chalcopyrite, was used. The quality was Cu: 28 mass%, Fe: 28 mass%, and S: 32 mass%.

上記の銅精鉱３ｇを硫酸にてｐH１．８に調整した浸出液（硫酸アンモニウム３ｇ／L、リン酸水素カリウム０．５ｇ／L、硫酸マグネシウム七水和物０．５ｇ／L、塩化カリウム０．１ｇ／Lを含む）を３００ｍLに混合し、５００ｍL容量の坂口フラスコに注いだ。上記フラスコ内の浸出液に、硫黄酸化細菌（アシディチオバチルス スピーシーズTTH19A（NITE BP-164））をその菌濃度が１．０×１０７個／ｍＬとなるように接種した。接種後１２日目に、銅鉱石より単離した鉄酸化細菌（アシディチオバチルス フェロオキシダンス）DSM14882株をその菌濃度が１．０×１０７個／ｍLとなるように接種し、３０℃にて振盪浸出した。浸出液の上澄みの銅濃度、ｐＨ、菌濃度を測定し、経時変化を調べた。 A leachate prepared by adjusting 3 g of the above copper concentrate to pH 1.8 with sulfuric acid (ammonium sulfate 3 g / L, potassium hydrogen phosphate 0.5 g / L, magnesium sulfate heptahydrate 0.5 g / L, potassium chloride 0.1 g / L) was mixed to 300 mL and poured into a 500 mL Sakaguchi flask. The exudate in the flask was inoculated with sulfur-oxidizing bacteria (Acidithiobacillus species TTH19A (NITE BP-164)) so that the bacterial concentration was 1.0 × 10 7 cells / mL. On the 12th day after inoculation, an iron-oxidizing bacterium (Acidithiobacillus ferrooxidans) DSM14882 strain isolated from copper ore was inoculated so that its concentration was 1.0 × 10 7 cells / mL, and 30 ° C. Leached with shaking. The copper concentration, pH, and fungus concentration in the supernatant of the leachate were measured, and the change with time was examined.

（比較例１〜４）
実施例１に記載の浸出液に、菌を接種しない以外は実施例１と同様にして振盪浸出した（比較例１）。また浸出開始時に鉄酸化細菌のみをその菌濃度が１．０×１０７個／ｍＬとなるように接種（比較例２）、浸出開始時に硫黄酸化細菌のみをその菌濃度が１．０×１０７個／ｍＬとなるように接種（比較例３）、浸出開始時に硫黄酸化細菌と鉄酸化細菌をそれぞれの菌濃度が１．０×１０７個／ｍLとなるように接種（比較例４）する以外は実施例１と同様にして振盪浸出した。 (Comparative Examples 1-4)
The leaching solution described in Example 1 was shaken and leached in the same manner as in Example 1 except that no bacteria were inoculated (Comparative Example 1). Further, at the start of leaching, only iron-oxidizing bacteria are inoculated so that the bacterial concentration becomes 1.0 × 10 7 cells / mL (Comparative Example 2), and at the start of leaching, only sulfur-oxidizing bacteria have a bacterial concentration of 1.0 × 10 6. Inoculate to 7 cells / mL (Comparative Example 3), and inoculate sulfur-oxidizing bacteria and iron-oxidizing bacteria at the start of leaching so that the concentration of each is 1.0 × 10 7 cells / mL (Comparative Example 4) Except that, shaking leaching was conducted in the same manner as in Example 1.

実施例１、及び比較例１〜４の試験結果のうち、銅濃度の推移を図１に、ｐＨの推移を図２に、菌濃度の推移を図３に示す。   Of the test results of Example 1 and Comparative Examples 1 to 4, the transition of the copper concentration is shown in FIG. 1, the transition of the pH is shown in FIG. 2, and the transition of the bacteria concentration is shown in FIG.

図１に示されるように、実施例１の銅濃度（４７日後：１．５０ｇ／Ｌ）は比較例１（５０日後：０．８８ｇ／Ｌ）に比べると高く、銅の浸出速度が速いことが確認できた。また、比較例２では浸出初期の銅濃度（６日目：０．５８ｇ／Ｌ）は実施例１（６日目：０．２４ｇ／Ｌ）に比べると高いが、最終的な銅濃度は５０日目で１．０ｇ／Ｌにとどまっており、鉄酸化細菌のみの接種の効果は小さい。また、実施例１の銅濃度（４７日後：１．５０ｇ／Ｌ）は、比較例３（５０日後：０．８９ｇ／Ｌ）に比べても高く、硫黄酸化細菌のみの接種の効果は小さい。硫黄酸化細菌と鉄酸化細菌を浸出開始時に接種した比較例４は、初期の銅濃度（７日目：０．６０ｇ／Ｌ）が実施例１（６日目：０．２４ｇ／Ｌ）に比べると高いが、最終的な銅濃度は３９日目で１．１７ｇ／Ｌにとどまり、硫黄酸化細菌と鉄酸化細菌を浸出開始時に同時に接種する効果は小さい。   As shown in FIG. 1, the copper concentration of Example 1 (after 47 days: 1.50 g / L) is higher than that of Comparative Example 1 (after 50 days: 0.88 g / L), and the copper leaching rate is high. Was confirmed. In Comparative Example 2, the copper concentration at the beginning of leaching (Day 6: 0.58 g / L) is higher than Example 1 (Day 6: 0.24 g / L), but the final copper concentration is 50 It is only 1.0 g / L on the day, and the effect of inoculation with only iron-oxidizing bacteria is small. Moreover, the copper concentration of Example 1 (after 47 days: 1.50 g / L) is higher than that of Comparative Example 3 (after 50 days: 0.89 g / L), and the effect of inoculation with only sulfur-oxidizing bacteria is small. In Comparative Example 4 inoculated with sulfur-oxidizing bacteria and iron-oxidizing bacteria at the start of leaching, the initial copper concentration (7th day: 0.60 g / L) is compared with Example 1 (6th day: 0.24 g / L). Although the final copper concentration is only 1.17 g / L on the 39th day, the effect of simultaneously inoculating sulfur-oxidizing bacteria and iron-oxidizing bacteria at the start of leaching is small.

図２に示されるように、菌を接種していない比較例１の場合は、硫黄の酸化による硫酸の生成が起こらないため、ｐＨが上昇し、試験開始４３日目に２．５を超えた。   As shown in FIG. 2, in the case of Comparative Example 1 in which the bacteria were not inoculated, sulfuric acid was not generated due to oxidation of sulfur, so the pH rose and exceeded 2.5 on the 43rd day from the start of the test. .

図３に示されるように、鉄酸化細菌を接種した１２日目の硫黄酸化細菌の菌濃度は１．０×１０８個／ｍＬであった。 As shown in FIG. 3, the concentration of sulfur-oxidizing bacteria on day 12 inoculated with iron-oxidizing bacteria was 1.0 × 10 8 cells / mL.

以上の結果から、ｐＨ１．８において、試験開始時に浸出液へ接種された硫黄酸化細菌が１．０×１０８個／ｍＬ以上に増殖した後に鉄酸化細菌を接種することで、効率よい銅の浸出ができることがわかった。 From the above results, at pH 1.8, efficient leaching of copper by inoculating iron-oxidizing bacteria after the sulfur-oxidizing bacteria inoculated into the leachate at the start of the test grew to 1.0 × 10 8 cells / mL or more. I found out that

図１は、実施例１及び比較例１〜４の浸出液（ｐＨ１．８）における、浸出液中の銅濃度の経時変化を示す。FIG. 1 shows the change over time of the copper concentration in the leachate in the leachate (pH 1.8) of Example 1 and Comparative Examples 1-4. 図２は、実施例１及び比較例１の浸出液（ｐＨ１．８）における、浸出液中のｐＨの経時変化を示す。FIG. 2 shows the change over time in the pH of the leachate in the leachate (pH 1.8) of Example 1 and Comparative Example 1. 図３は、実施例１の浸出液（ｐＨ１．８）における、浸出液中の菌濃度の経時変化を示す。FIG. 3 shows the change over time in the concentration of bacteria in the leachate in the leachate (pH 1.8) of Example 1.

Claims (1)

黄銅鉱を含有する硫化銅鉱から銅を浸出するに際し、ｐＨを１．６以上２．５未満に調整した浸出液を用い、該浸出液に浸出開始時に接種した硫黄酸化細菌が１．０×１０８個／ｍＬまで増殖した後、鉄酸化細菌を該浸出液に接種して銅の浸出を行うことを特徴とする、硫化銅鉱からの銅の浸出方法。 When copper is leached from copper sulfide ore containing chalcopyrite, a leachate whose pH is adjusted to 1.6 or more and less than 2.5 is used, and 1.0 × 10 8 sulfur-oxidizing bacteria inoculated into the leachate at the start of leaching. A method of leaching copper from copper sulfide ore, characterized by inoculating iron-oxidizing bacteria into the leaching solution and then leaching copper after growing to / mL.
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CN101956071A (en) * 2010-10-31 2011-01-26 中南大学 Biological metallurgy mineral leaching microorganism combined bacterium fluid for copper ore and method for recycling metallic copper
JP2011190520A (en) * 2010-03-17 2011-09-29 Jx Nippon Mining & Metals Corp Method for leaching copper sulfide ore
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011190520A (en) * 2010-03-17 2011-09-29 Jx Nippon Mining & Metals Corp Method for leaching copper sulfide ore
WO2011145688A1 (en) * 2010-05-19 2011-11-24 Jx日鉱日石金属株式会社 Method for processing acidic solution that contains iodide ions and iron ions
US8865119B2 (en) 2010-05-19 2014-10-21 Jx Nippon Mining & Metals Corporation Method for processing acidic solution that contains iodide ions and iron ions
JP5711225B2 (en) * 2010-05-19 2015-04-30 Jx日鉱日石金属株式会社 Method for treating acidic solution containing iodide ion and iron ion
CN101956071A (en) * 2010-10-31 2011-01-26 中南大学 Biological metallurgy mineral leaching microorganism combined bacterium fluid for copper ore and method for recycling metallic copper
CN103898550A (en) * 2014-04-14 2014-07-02 常州纺织服装职业技术学院 Recovery method of cupper in circuit board
WO2017032164A1 (en) * 2015-08-27 2017-03-02 中国科学院过程工程研究所 Method for starting water spraying in copper sulphide ore heap bioleaching

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