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A process of depth reduction-magnetic separation technology research was introduced to pyrite cinder from Hebei. And the factors that influence the process of depth reduction and separation were systematic studied. The means of SEM, XRD were used to analyze the pyrite cinder, the roasted product of pyrite cinder and the iron ore concentrate. The results showed that the pyrite react with desulfurization agent to form metallic iron and calcium sulfide. Under optimal conditions of depth reduction, and only one stage of grinding-magnetic separation, the grade and the recovery rate of iron concentration arrived at 93.13% and 92.21%, respectively, with the sulfur content of 0.06% and it could be directly used in steelmaking after subsequent treatment, which reached the target of efficient use of solid waste, ie pyrite cinder. [ABSTRACT FROM AUTHOR]

The adsorption of moderately thermophilic bacteria (A c, S.t and L f) on the surface of pyrite was studied experimentally. The bacterial adsorption on the surface of pyrite was measured at different pH values. 1. 6, 2. 0 and 2. 5) and temperatures(40 C and 45 C). Results showed that the adsorption capacity of L, f on the mineral surface is strong, when the temperature is 40 C and pH value is 2. 0, the adsorption capacity of L f reached 89. 47%. The adsorption capacity of mixed bacteria (A c : S t : L f = 1:1: 1)reached 75. 54% when pH value is 1.6. Initial temperature of solution had no significant effect on the contact angles and Zeta potentials of pyrite-grown bacteria. The contact angles and Zeta potentials decreased as the initial pH value of solution increased. The results of static microscope and scanning electron microscope showed that the bacteria were arranged in single cell or cluster on the surface of pyrite, and a large number of bacteria were adsorbed on the cracks or depressions of pyrite, which was of great significance to the leaching of minerals. [ABSTRACT FROM AUTHOR]