Lime can be effectively suppressed pyrite, mainly due to the OH- and lime solution generated disincentive Ca +, OH- and pyrite surface of Fe2 + for the hydrophilic and form insoluble ferrous hydroxide [Fe (OH) 2 ] and iron hydroxide [Fe(OH)3] film, which inhibits pyrite. When pyrite is treated with xanthate, a hydrophobic film of iron xanthate has formed on the surface of the pyrite, OH- can also replace the xanthogen ion to form a hydrophilic ferrous hydroxide film on the surface thereof, so that Suppressed. The reaction is as follows:
FeS 2 ]Fe(ROCSS) 2 +2OH-====FeS 2 ]Fe(OH) 2 +2ROCSS- Since the solubility product of Fe(OH) 2 is 4.8×10 −16 ,
The solubility product of Fe(OH) 3 is 3.8× 10—33, which is much smaller than the solubility product of Fe(ROCSS) 2 of 8× 10—8 , so it is in the alkaline pulp. OH- has the ability to displace xanthate anion and easily form a hydrophilic iron hydroxide film on the surface of pyrite.
(2) Inhibition, in addition to OH-induced, Ca2+ also has an effect
The presence of hydrophilic Ca(OH)2 colloidal particles hinders the collector from contacting the surface of the pyrite while being hydrophilic.
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