High temperature oxidation acid leaching means temperature at 200 — 230 ° C The pressure is leached at 4 to 6 MPa . At this time, sulfur sulfide ore are oxidized to sulphate, the total leaching of copper ore takes yellow reaction may be written as:
2CuFeS 2 + H 2 SO 4 + 8.50 2 ==== 2CuS0 4 + Fe 2 ( S0 4 ) 3 + H 2 0
Symbiotic pyrite also leached under the leaching conditions such, at low pH, ferric iron hematite hydrolysis, to produce sulfuric acid, the following formula:
Fe 2 ( S0 4 ) 3 + 3H 2 0 ==== Fe 2 0 3 + 3H 2 S0 4
According to the reaction ratio calculation, oxygen is required to oxidize per kilogram of sulfur. 2.12kg . If a concentrate contains Cu 26% , Fe 31.3% , S 36% , oxygen is required to dissolve per kilogram of copper. 2.93kg . Iron can also be precipitated into goethite Fe00H, acid type yellow iron sputum ( H 3 0)Fe 3 (S0 4 ) 2 (OH) 6 and basic ferric sulphate Fe (OH ) under different temperature and pH conditions and oxidation conditions. ) S0 4 . However, due to the different composition of these precipitates, the amount of sulfuric acid produced is also different. The reaction such as the formation of ( H 3 0 ) Fe 3 ( S0 4 ) 2 ( OH ) 6 is:
3Fe 2 ( S0 4 ) 3 + 14H 2 0 ==== 2 ( H 3 0 ) Fe 3 ( S0 4 ) 2 ( OH ) 6 + 5H 2 S0 4
The acid ( H + ) produced per mole of Fe 3+ hydrolysis is only 5/3 mol , and when hematite is formed, the acid ( H + ) produced per mole of Fe 3+ hydrolysis is 3 mol .
The stability of iron precipitation affects the safety of leaching slag discharge. The stability of hematite is best, no further water is explained, and lime does not react. Basic iron sulfate or the like reacts with lime, and iron ions are further hydrolyzed. Therefore, both ferric form a basic type or jarosite acid (H 3 0) Fe 3 ( S0 4) 2 (OH) 6, when the cyanidation slag, lime consumption tend to be large.
2CuFeS 2 + H 2 SO 4 + 8.50 2 ==== 2CuS0 4 + Fe 2 ( S0 4 ) 3 + H 2 0
Symbiotic pyrite also leached under the leaching conditions such, at low pH, ferric iron hematite hydrolysis, to produce sulfuric acid, the following formula:
Fe 2 ( S0 4 ) 3 + 3H 2 0 ==== Fe 2 0 3 + 3H 2 S0 4
According to the reaction ratio calculation, oxygen is required to oxidize per kilogram of sulfur.
3Fe 2 ( S0 4 ) 3 + 14H 2 0 ==== 2 ( H 3 0 ) Fe 3 ( S0 4 ) 2 ( OH ) 6 + 5H 2 S0 4
The acid ( H + ) produced per mole of Fe 3+ hydrolysis is only 5/3 mol , and when hematite is formed, the acid ( H + ) produced per mole of Fe 3+ hydrolysis is 3 mol .
The stability of iron precipitation affects the safety of leaching slag discharge. The stability of hematite is best, no further water is explained, and lime does not react. Basic iron sulfate or the like reacts with lime, and iron ions are further hydrolyzed. Therefore, both ferric form a basic type or jarosite acid (H 3 0) Fe 3 ( S0 4) 2 (OH) 6, when the cyanidation slag, lime consumption tend to be large.
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