Study on Vacuum Roasting Pretreatment of Carbonaceous Gold Concentrates Based on Nonoxidation Technology

Table 7

Gold phase analysis of calcine.

Phase classification	W (Au) (g·t^−1)	Rate of distribution (%)
Exposed and semiexposed gold	10.43	57.56
Carbonate-locked gold	3.14	17.33
Hematite and limonite-locked gold	0.89	4.91
Sulfides-locked gold	1.01	5.57
Silicate-locked gold	2.65	14.63
Total	18.12	100.00