What is the basic principle of oxidative roasting and sulphation roasting?
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2MS+30 2 ==== 2M0+2S0 2 (1)
2S0 2 +O 2 â†â†’ 2SO 3 (2)
MO+SO 3 â†â†’ MSO 4 (3)
In the oxidative calcination, the reaction (1) of the metal sulfide and the sulfur dioxide is irreversible, and the formulas (2) and (3) are reversible.
In the roasting process, when the partial pressure of sulfur trioxide in the furnace gas is greater than the decomposition pressure of the metal sulfate, the calcined product is a metal sulfate, and the process is a sulfurization roasting. on the contrary. When the partial pressure of sulfur trioxide in the furnace gas is less than the decomposition pressure of the metal sulfate, the calcined product is a metal oxide (fully desulfurized roasting). Therefore, the sulfide oxidized octomerization product at a certain temperature depends on the gas phase composition and the dissociation pressure of the metal sulfide, oxide and metal sulfate. The decomposition temperature and decomposition free energy of various metal sulfates are different. By controlling the calcination temperature and the composition of the furnace gas, the composition of the calcined product can be controlled to achieve the purpose of selecting the sulfated calcination.
Roasting of sulfides such as sulfides of copper during copper is
550 °C
2CuFeS 2 ======= Cu 2 S+2FeS+S
400 °C
2CuS ====== Cu 2 S+S
200~300 °C
2Cu 2 S+5O 2 ========= 2Cu0+2CuS0 4
300 °C
Cu 2 S+20 2 ======2Cu0+SO 2
>1000 °C
4Cu0 ======= 2Cu 2 0+0 2
1 <650 °C
SO 2 +——0 2 ======= SO 3
2
<650 °C
Cu0+SO 3 =======CuSO 4
When sulfide is present, the copper sulfate formed by the reaction will react with each other at a very low temperature to decompose:
100 °C
CuSO 4 +3CuS ======= 2Cu 2 S+2S0 2
300~400 °C
2CuS0 4 +Cu 2 S}===========2Cu 2 0+3SO 2
Therefore, the temperature of copper sulphation roasting should be less than 65,090, and the temperature of oxidizing roasting should be higher than 650 cC. At this time, the calcined products are mainly unoxidized cuprous sulfide, copper oxide and a small amount of copper sulfate.