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

Table 4

Chemical phase analysis of C and S contents at different conditions.

Treatment conditions (°C)	S (%)		Chemical phase of C (%)
			Graphite carbon	Carbonate	Organic carbon	Total
Untreated	3.36	Content	0.68	0.35	12.97	14.00
		Distribution	4.86	2.50	92.64	100.00
800	2.53	Content	0.46	0.14	13.36	13.96
		Distribution	3.30	1.00	95.70	100.00
1,200	0.14	Content	1.88	0.74	4.49	7.11
		Distribution	26.44	10.41	63.15	100.00