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
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.
