IRON OXIDE AND IRON MICRODIMENSIONAL TUBES AND THE METHOD OF THEIR OBTAINING Russian patent published in 2018 - IPC C04B35/624 D01F1/08 C01G49/02 

FIELD: technological processes.

SUBSTANCE: invention relates to iron and iron oxide microscale tubes and a process for their preparation. Resulting micro-sized tubes can be used as fillers for polymeric and ceramic matrices, microreactors, transport systems, electroconductive and magnetic elements, sorbents of toxic metal ions, membranes and filters. Iron-oxide and iron micro-sized tubes are made using a sol-gel method, while the iron oxide micrometer tubes have an outer diameter of 5 mcm to 15 mcm, and the iron tubes 4 mcm to 9 mcm, the wall thickness varying from 0.1 mcm to 4.0 mcm. Method for producing iron oxide microscale tubes includes impregnating cellulosic fibers in an ash obtained on the basis of ferric chloride, with acidic dispersion medium without evaporation stage and calcination at a temperature of 600–1,200 °C, which provides the formation of walls with a thickness of 0.1 mcm to 4.0 mcm. To produce iron micrometer tubes, including those having a sponge structure, iron oxide microweak tubes are reduced to iron tubes in a tubular flow reactor in a hydrogen stream.

EFFECT: to develop micro-sized tubes with improved physico-chemical properties and enhanced functionality; simplify and reduce the cost of production of iron and iron oxide microscale tubes.

7 cl, 4 dwg, 2 tbl, 3 ex