Thermodynamic Behavior of Pyrite and Arsenopyrite in Preoxidation for Chlorination Leaching of Refractory Gold Concentrate

Table 1

Values of the ∆_fG⁰ FeS₂-H₂O system and FeAsS-H₂O system at 298.15K.

Component	∆fG^0 (kJ/mol)	Component	ΔfG^0 (kJ/mol)	Component	ΔfG^0 (kJ/mol)
H2	0	Fe	0	H3AsO3	−639.8
H^−	0	Fe^2+	−78.9	H2AsO3^−	−587.1
O2	0	Fe^3+	−4.7	HAsO3^2−	−517.2
H2O	−237.1	Fe(OH)2	−479.3	AsH3	168.9
S	0	Fe(OH)3	−696.5	FeS2	−166.9
HSO4^−	−755.9	As	0	FeS	−100.4
SO4^2−	−744.5	H3AsO4	−766.0	FeAsS	−109.6
H2S	−26.9	H2AsO4^−	−753.2	FeAsO4	−768.6
HS^−	12.1	HAsO4^2−	−714.7
S^2−	85.8	AsO4^3−	−648.4