JP6184894B2 - 硫砒銅鉱からの銅の浸出方法 - Google Patents
硫砒銅鉱からの銅の浸出方法 Download PDFInfo
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- JP6184894B2 JP6184894B2 JP2014061950A JP2014061950A JP6184894B2 JP 6184894 B2 JP6184894 B2 JP 6184894B2 JP 2014061950 A JP2014061950 A JP 2014061950A JP 2014061950 A JP2014061950 A JP 2014061950A JP 6184894 B2 JP6184894 B2 JP 6184894B2
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Description
[式1]
Cu3AsS4+3H2O=3Cu2++H3AsO3+4S0+3H++9e−
2)一方、浸出液の酸化還元電位が低いときは、一般的に銅の溶出量が低下すると共に砒素は固定化されずに銅と同じ程度に溶出される。
3)浸出液の酸化還元電位が低くても四面砒銅鉱を不純物として含んだ硫砒銅鉱の場合は、下記式2に示すH2S生成型反応が進行して硫砒銅鉱の浸出が進み、砒素の溶出速度は上昇する。
[式2]
Cu3AsS4+3H2O+5H+=3Cu2++H3AsO3+4H2S+e−
2種類の塊状の硫砒銅鉱に対して硫酸水溶液で浸出させる実験を行った。浸出に先立ち、先ずこれら2種類の硫砒銅鉱に対してX線回折(XRD)を用いて分析を行った。その結果、一方はほぼ純粋な硫砒銅鉱であることが確認され、もう一方には硫砒銅鉱に四面砒銅鉱が混在していた。前者の純粋な硫砒銅鉱を試料1とし、後者の四面砒銅鉱を不純物として含んだ硫砒銅鉱を試料2とし、これら試料をそれぞれ粉砕してから、目開き38μmの篩で篩分けを行って篩下の−38μmを実験用に回収した。
実施例1と同様にして作製した浸出始液に対して試薬として硫酸第1鉄を加えてその酸化還元電位を様々に変えた複数の浸出始液を調製し、これら複数の浸出始液を用いて実施例1と同様に試料1及び試料2の硫砒銅鉱に対して浸出実験を行った。なお、酸化還元電位の測定は、作用極に上記塊状の硫砒銅鉱から約1cm角に切り出したものを硫砒銅鉱電極として用い、参照極には標準水素電極を用い、対極には白金電極を用いた。図2に2日経過後の銅浸出率を溶液の酸化還元電位に対してプロットしたグラフを示す。なお、図中の溶液酸化還元電位は、標準水素電極基準に変換している。
硫砒銅鉱の電位依存性を調べるため、ビー・エー・エス株式会社製のALS1205Bを用いて実験を行った。その際、作用極には硫砒銅鉱電極を使用し、0.1M硫酸溶液中で電位走査させて電流密度[Am−2]を測定した。その結果、図4に示すように、650mV付近に電流ピークがみられ、上記の実施例2の浸出実験における銅の溶出率とよく一致することが分かった。すなわち、鉱物表面を電位走査することで、溶解の良否を事前に把握することができ、浸出条件の調整を容易に行うことができた。
Claims (1)
- 硫砒銅鉱に対して四面砒銅鉱の共存下で浸出液として鉄イオンを含有する硫酸酸性溶液を使用することで、前記硫砒銅鉱中の銅を前記硫酸酸性溶液中に浸出させる浸出方法であって、
前記硫酸酸性溶液の浸出開始時点の酸化還元電位を、標準水素電極を参照電極とする電位で600mV以上700mV以下とすることを特徴とする硫砒銅鉱からの銅の浸出方法。
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