الصهر والتنقية الذهبية — إنتاج قضبان دورو وفحص الجودة من خلال اختبار الحريق

Doré Bar Production

Gold doré bars (85-95% Au) are produced by smelting gold-bearing precipitates from electrowinning or gravity concentrate.

Smelting Process

Borax, silica and sodium carbonate fluxes are mixed with gold precipitate and melted at 1,100-1,200°C. Molten metal is poured into cast-iron molds.

Fire Assay

Fire assay is the standard method for determining gold content in doré bars. WSHT supports assay laboratory setup and quality control.