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Adsorption of Sodium Cyanide on Pyrite Particle Surface

Adsorption of sodium cyanide on pyrite particle surface was studied. And influences of adsorbing time, dosage of pyrite, and pH on adsorbing effect were investigated. IR spectra, SEM, EDS and Element Area Scanning of samples before and after adsorption were measured. Results showed that adsorption of sodium cyanide on pyrite particle surface is a fast adsorbing process. As soon as adsorbing time is 1 min, adsorbing equilibrium is reached. At the condition of concentration of NaCN 24mg/L, adsorbing time 5min, and stirring rate 2000r/min, when dosage of pyrite particles is 5g/L, adsorbing rate is up to 80%, and at the time adsorbing capacity is the largest, 381.4mg/g. When pH is within 8.0-11.0, pH has little influence on adsorbing effect. IR and EDS results showed that at the particle range of-45μm is 93%, the surface of pyrite particles is easy to be oxidized and hydroxylated. S atoms on the surface of pyrite lattice are oxidized, while Fe atoms on the surface of pyrite lattice are hydroxylated. There exists hydrogen bond function between CN- and OH-, and there exists monomolecular chemical bond function between CN- and pyrite. And-Fe (CN)nm-(n<6) is produced on the surface of pyrite, thus the superficial properties of pyrite is changed.