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Aiming at the problem of over-grinding and under-grinding and the influence of grinding mode and feed size on ore grinding effect. Cassiterite polymetallic sulfide ore was taken as the research object. The grain size distribution of grinding minerals and grinding behavior characteristics were explored based on batch grinding test, by changing grinding method, feed sizes, grinding time and other factors affecting grinding. It was shown by the results that attrition grinding process was a low-energy grinding, the force of ore was small, and the under-grinding was easy to occur, whereas drop grinding and impact grinding processes were high-energy grinding, the ore was subjected to greater force, more fully broken, easy to occur over-grinding phenomenon. The variation amplitude of grinding technical efficiency E and grinding mineral substance tw was stable with grinding time under grinding conditions, and the product size distribution was uniform. Grinding technical efficiency E and grinding product t10 were changed obviously with the grinding time under drop grinding and impact grinding, and the change range was large, and in general, the two grinding indexes are greater than that of attrition grinding. Complicated and without obvious rule was the relationship between the grinding behavior of ore and the feeding size. A theoretical basis for the subsequent research on the strength and interaction of attrition and impact forces in the dropping state was provided by the research results. [ABSTRACT FROM AUTHOR]

With amino black 10B as the pollutant, the effects of the amount of catalyst added, the amount of purified zinc ferrite, the initial concentration of the solution, the initial pH of the solution, and the light time on the degradation of amino black 10B were studied. The results show that when the titanium dioxide is prepared by the sol gel method at 400 °C, the physical mixing of the titanium dioxide and purified zinc ferrite photocatalytic amino black 10B is the best. In the photocatalytic reaction, the effect of zinc ferrite content on the removal rate of amino black 10B is not obvious, and the initial concentration of the solution and the initial pH value have a great effect on the removal rate of amino black 10B. In the purified zinc ferrite/titanium dioxide composite, the removal rate of amino black 10B was the highest, and it could reach 98. 01% in 60 min of light when the purified zinc ferrite doping amount accounts for 15% of the mass. [ABSTRACT FROM AUTHOR]