Degradation Of Performance. Sulfide Ore Flotation Mechanism

The flotation reagents in the waste water of mineral processing result in the environment problem. It is necessary to understand the degradation process and mechanism which will give the direction in the treatment of mining waste water and the development new environment-friendly flotation reagents.The degradation properties of sulfide flotation collectors such as Xanthogenate, Dithiocarbamate, Dithiophophate, N,N-dialkyl-dithiocarbamatecyanoethylene and Thionocarbamate are studied in this paper. The degradation properties of butylxanthate, Ammoniumbutyl-dithiophophate, Sodiumdiethyldithiocarbamate, Ester-105 and Z-200 are studied in the condition of pH, temperature and illumination. It shows that the ionic reagents degrade more than twenty percent while the non-ionic reagents degrade only ten to twenty percent in the same acidity, neutral or alkalescence solution. Higher temperature and illumination are favor to degradation of the reagents. The degradation sequence of the collectors is following: Sodiumdiethyldithiocarbamate > butylxanthate > Ammoniumbutyldithiophophate > Z-200 Ester-105. the dynamic equation of the degradation of degradation is C=C0e-kt . The letter K in the equation is the velocity constant which is larger, the faster degradation of the collector. The pyrogenation properties of the reagents are different by the analyse of thermogravimetry experiment. The pyrogenation stability sequence of the reagents is following: Z-200 > butylxanthate > Sodiumdiethyldithiocarbamate > Dithiophophate > Ester-105. It is also shown that non-ionic-ester reagents could biodegrade easier than ionic reagents by the experiment biodegradation properties of the reagents.The relationships between HMO index and degradation property are discussed based on quantum chemistry. It shows that the stability of thecollectors having the same function group as C=S may be consequence with the HMO indexes such as qr, Qr, fr(frontiar electron density) , Sr (superdelocalizability). The stability of the collectors having different function group may be correlation with the gross moleculeorbitenergy. At the same time, electron cloud density of the nitrogen atom may be taken as the key factor to be correlation with the biodegradation property.