塩基性チオシアン酸アンモニウム溶液による銅の溶解

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書誌事項

タイトル別名
  • Dissolution of Copper in Basic Ammonium Thiocyanate Solution.
  • エンキセイ チオシアンサン アンモニウム ヨウエキ ニ ヨル ドウ ノ ヨウカ
公開日
1994
DOI
  • 10.2473/shigentosozai.110.725
公開者
一般社団法人 資源・素材学会

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説明

A large amount of the so-called rhodan waste solution that includes ammonium thiocyanate and ammonium thiosulfate is produced by the treatment of coke oven gas at the iron and steel manufactures, and this solution is combusted without utilization. This report is a basic research for using the rhodan waste solution to remove copper from iron scrap. The effects of the concentration of thiocyanate, oxidizing agents, pH and a temperature on the dissolution of copper were studied. Both Cu (II) and oxygen gas are necessary for an effective dissolution of copper, and the value of pH in a solution must be kept at 9. The dissolution rate of copper increases proportionally with the concentration of thiocyanate at its lower concentration, In this case, the rate-determining step is assumed to be the chemical reaction on an anodic site of the surface of copper. At the higher concentration of thiocyanate, the dissolution rate of copper hardly depends on the concentration, but it depends on the concentration of Cu (II). In this case, the rate - determining step is assumed to be the diffusion of Cu (II) on the cathodic site of copper. The reactions are considered as follows: Cu+2SCN-+Cu (NH3) 42+ =2CuSCN (s) +4NH3<BR>CuSCN (s) +SCN-=Cu (SCN) 2-<BR>Cu (SCN) 2-+4NH3+H++1/2O2=Cu (NH3) 42++2SCN-+1/2H2O

収録刊行物

  • 資源と素材

    資源と素材 110 (9), 725-732, 1994

    一般社団法人 資源・素材学会

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