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

Table 3

Gold phase analysis of the sample.

Phase classification	W (Au) (g·t^−1)	Rate of distribution (%)
Exposed and semiexposed gold	5.17	34.65
Carbonate-locked gold	0.60	4.02
Hematite and limonite-locked gold	1.27	8.51
Sulfides-locked gold	6.50	43.57
Silicate-locked gold	1.38	9.25
Total	14.92	100.00