Proses Wohlwill

Proses Wohlwill adalah prosedur kimia skala industri yang digunakan untuk memurnikan emas hingga tingkat kemurnian tertinggi (99,999%). Proses ini ditemukan pada tahun 1874 oleh Emil Wohlwill. Proses elektrokimia ini melibatkan penggunaan batangan emas tuang, sering disebut batangan doré, yang terbuat dari 95%+ emas untuk dijadikan anoda. Persentase emas yang lebih rendah di anoda akan mengganggu reaksi, terutama bila logam yang mengkontaminasi adalah perak atau salah satu unsur golongan platina. Katoda untuk reaksi ini adalah lembaran kecil lembaran emas murni (24k) atau baja tahan karat. Arus dialirkan ke sistem, dan listrik mengalir melalui elektrolit asam kloroaurat. Emas dan logam lainnya dilarutkan di anoda, dan emas murni (yang datang melalui asam kloroaurat melalui transfer ion) disalurkan ke katoda emas. Ketika anoda dilarutkan, katoda dikeluarkan dan dicairkan atau diproses dengan cara lain sesuai dengan cara yang diperlukan untuk dijual atau digunakan. Emas yang dihasilkan memiliki kemurnian 99,999%, dan kemurniannya lebih tinggi dibandingkan emas yang dihasilkan melalui metode pemurnian umum lainnya, proses Miller, yang menghasilkan emas dengan kemurnian 99,5%.[1] [1][2][3]

Untuk produksi emas industri, proses Wohlwill diperlukan untuk aplikasi emas dengan kemurnian tertinggi. Ketika emas dengan kemurnian lebih rendah diperlukan, penyuling sering kali menggunakan proses Miller karena proses tersebut relatif mudah dan waktu penyelesaian yang lebih cepat serta karena tidak memerlukan inventaris emas dalam jumlah besar, dalam bentuk asam kloroaurat.

Lihat pula

Referensi

  1. ^ a b Renner, Hermann; Schlamp, Günther; Hollmann, Dieter; Lüschow, Hans Martin; Tews, Peter; Rothaut, Josef; Dermann, Klaus; Knödler, Alfons; Hecht (2005), "Gold, Gold Alloys, and Gold Compounds", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a12_499 
  2. ^ Noyes, Robert (1993). Pollution prevention technology handbook. William Andrew. hlm. 342. ISBN 0-8155-1311-9. 
  3. ^ Pletcher, Derek and Walsh, Frank (1990). Industrial electrochemistry. Springer. hlm. 244. ISBN 0-412-30410-4. 

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