METHOD FOR PRODUCING A GRAPHITE-BASED SORBANT

摘要

The present invention pertains to the protection of the environment may be used in the sorption of crude oil spills and of petroleum products at the surface of water as well as for locating spills of crude oil and mainly burning crude oil. The method for producing the graphite-based sorbant involves the thermal expansion of an oxidised graphite powder. The oxidised graphite is previously mixed with a powder of an iron, cobalt or nickel compound in an organic liquid in order to impart magneto-active properties to the sorbant. After the homogeneous distribution of the metal compound in the mixture volume, the organic liquid is removed and the solid phase is dried until it reaches a loose state, said phase being further submitted to thermal expansion at a temperature of 900 to 1300 DEG C. The iron compound essentially consists of oxide compounds, mainly magnetite (Fe3O4). The cobalt and nickel compounds can be used together with the iron compounds or separately. The oxidised graphite can be mixed with the magnetite powder until an iron content of 1.5 to 35 wt % is reached after conversion into metal. The acceptable organic liquids may consist of petrol, acetone, diesel fuel or a gaseous condensate, but other liquids may also be used.