Study on the Action Mechanism of Inhibitor HS-1 in the Separation of Copper and Sulfur
In the process of copper-sulfur flotation separation,adding a large amount of lime to inhibit pyrite will have many disadvantages,such as slurry viscosity,pipeline fouling,occurrence of running trough and reducing gold and silver recov-ery.Therefore,it is of great significance to develop new inhibitors to achieve copper-sulfur separation under low alkalinity con-ditions.HS-1 is a selective inhibitor for sulfide ore flotation.In order to study the mechanism of HS-1 in copper-sulfur separa-tion,pure mineral flotation,artificial mixed mineral flotation,contact angle measurement,adsorption capacity test and infrared spectroscopy(FTIR)were carried out on chalcopyrite and pyrite pure minerals.The flotation test results show that under the conditions of pulp pH=7,ammonium dibutyl dithiophosphate dosage of 9 mg/L and 2#oil dosage of 20 g/t,when the dosage of HS-1 is 150 mg/L,the recovery rate of pyrite can be reduced to less than 20%,while the recovery rate of chalcopyrite can be maintained above 85%.Contact angle measurement and adsorption capacity test show that HS-1 can greatly reduce the adsorp-tion capacity of ammonium dibutyl dithiophosphate on the surface of pyrite,and make the surface of pyrite hydrophilic,thus re-ducing the floatability of pyrite.Infrared spectroscopy analysis shows that HS-1 can selectively interact with pyrite,weaken the characteristic peaks generated by the action of ammonium dibutyl dithiophosphate on the surface of pyrite,and generate new ab-sorption peaks,which hinders the adsorption of ammonium dibutyl dithiophosphate on the surface of pyrite.Therefore,HS-1 can selectively inhibit pyrite and achieve copper-sulfur separation under low alkali conditions.
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