Alkaline oxidative leaching of gold-bearing arsenopyrite ores
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields



Publication Date Range:


Document Data


Document Type:






Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page


Alkaline oxidative leaching of gold-bearing arsenopyrite ores

Filetype[PDF-1015.06 KB]

  • English

  • Details:

    • Description:
      "The U.S. Bureau of Mines developed an alkaline oxidative pretreatment leaching procedure to increase the recovery of gold from arsenopyrite (feass) ores. The best solution compositions for arsenopyrite dissolution were determined using cyclic voltammetry and chronocoulometry. Initial arsenopyrite dissolution occurred at - 0.20 V versus standard hydrogen electrode (she) in a sodium hydroxide (naoh) solution. Leaching of a high-grade arsenopyritic ore containing, in percent, 28.2 As, 25.3 Fe, 19.9 Total s, and 1.0 Sb and, in troy ounces per short ton, 1.6 Au and 5.5 Ag resulted in > 90 pct as extraction at 100 deg c, 40 psig o2, 4 h, and 2 m naoh solution in a 2-l autoclave. Cyanidation of the leach residues resulted in 90 to 93 pct au and 60 to 80 pct ag extractions, compared with only 5 and 15 pct, respectively, without the pretreatment. The procedure was further tested by leaching a low- grade gold ore and a bulk sulfide flotation concentrate prepared from it. Cyanidation of the leach residues resulted in 70 pct au and 31 pct ag extraction. The naoh leachate was partially regenerated by precipitating the arsenate as calcium arsenate [ca3(aso4)2] and the sulfate as barium sulfate (baso4)." - NIOSHTIC-2

      NIOSHTIC no. 10007261

    • Document Type:
    • Main Document Checksum:
    • File Type:

    Supporting Files

    • No Additional Files

    More +

    You May Also Like

    Checkout today's featured content at