In this paper the research results on the preparation of ferri-magnetofluids through colloid chemical methods developed in China are in-troduced , and the applications of the resulted fluids in mineral separations are...In this paper the research results on the preparation of ferri-magnetofluids through colloid chemical methods developed in China are in-troduced , and the applications of the resulted fluids in mineral separations are described. The colloid chemical method includes the procedure of oxi-dation-hydrolysis-collection-dispersion. It is shown that by adding NaOH to an FeSO4 ?7H2O aqueous solution, followed by aeration, an oxidation-hydrolysis reaction occurs which produces ultrafine Fe3O4 particles. The particles may then be collected by sodium oleate into kerosene phase and thus forming stable oil-base ferrimagnetofluid, or, alternately, the parti-cles may be coated with sodium oleate first, then flocculated by adding HC1, follmved by redispersion in water by adding sodium dodecyl benzen-sulphonate, to form a water-base ferrimagnetofluid. The above ferrimag-netofluids have been used as separation media in the separation of arsenopy-rite from galena, and in the separation of gold from hard- rock gold ores. The results show that the ferrimagnetofluids are better than paramag-netofluids.展开更多
The gas flow field and the separation efficiency of a novel fluid catalytic cracking (FCC) riser terminal device, named as Super Short Quick Separator (SSQS), were studied. On the basis of above investigations, a sect...The gas flow field and the separation efficiency of a novel fluid catalytic cracking (FCC) riser terminal device, named as Super Short Quick Separator (SSQS), were studied. On the basis of above investigations, a section-lateral-mixing separation model was proposed, which included both the effect of inertia and structure of gas outlet on particles capture. After final modification, the results predicted with this model could be in good agreement with the cold experimental data. According to this model, the separation efficiency of SSQS is mainly influenced by the difference between the arc radius and the center pipe radius as well as the magnitude of particle tangential velocity.展开更多
文摘In this paper the research results on the preparation of ferri-magnetofluids through colloid chemical methods developed in China are in-troduced , and the applications of the resulted fluids in mineral separations are described. The colloid chemical method includes the procedure of oxi-dation-hydrolysis-collection-dispersion. It is shown that by adding NaOH to an FeSO4 ?7H2O aqueous solution, followed by aeration, an oxidation-hydrolysis reaction occurs which produces ultrafine Fe3O4 particles. The particles may then be collected by sodium oleate into kerosene phase and thus forming stable oil-base ferrimagnetofluid, or, alternately, the parti-cles may be coated with sodium oleate first, then flocculated by adding HC1, follmved by redispersion in water by adding sodium dodecyl benzen-sulphonate, to form a water-base ferrimagnetofluid. The above ferrimag-netofluids have been used as separation media in the separation of arsenopy-rite from galena, and in the separation of gold from hard- rock gold ores. The results show that the ferrimagnetofluids are better than paramag-netofluids.
文摘The gas flow field and the separation efficiency of a novel fluid catalytic cracking (FCC) riser terminal device, named as Super Short Quick Separator (SSQS), were studied. On the basis of above investigations, a section-lateral-mixing separation model was proposed, which included both the effect of inertia and structure of gas outlet on particles capture. After final modification, the results predicted with this model could be in good agreement with the cold experimental data. According to this model, the separation efficiency of SSQS is mainly influenced by the difference between the arc radius and the center pipe radius as well as the magnitude of particle tangential velocity.
