GB1045406A - Process for treating petroleum coke - Google Patents

Abstract

Petroleum coke particles are activated on their exterior surfaces by treating with an oxidizing gas at a temperature of at least 450 DEG C. for at least 5 minutes, then mixed with a carbonaceous binder, and tempered in an atmosphere containing at least 4% O2 at 200-300 DEG C. for at least 40 minutes. Activation is preferably effected in an atmosphere of steam and air, e.g. 70-85% steam, at 500-700 DEG C. for 10-30 minutes, or in air at 450-550 DEG C. for 5-10 minutes, in fluid, fixed, or moving bed, with counter- or non-current flow, or in a rotating drum. The mixture may be compacted, e.g. at 100-200 DEG C. and 10-24,000 p.s.i. before or after tempering. It may contain 1/2 -1% of MnO, S, MgO, and/or CaO to accelerate tempering, and up to 35% CaO or Fe ore may also be incorporated. The compact is then calcined or coked, e.g. at 700-940 DEG C., to give a product of crushing strength greater than 1500 lb./sq. inch and real density 1.05-1.35 g./c.c. Suitable binders are aromatic tars, coal tar pitch, gilsonite, coking residues, and heavy petroleum residues, e.g. asphalt, used in amounts of 10-25%. The petroleum coke may be obtained from "delayed", "fluid" or "continuous contact" processes, and should be less than 1/16 inch in size. The treated coke may be mixed with coal prior to coking or calcining. Examples are described.ALSO:Petroleum coke particles are activated on their exterior surfaces by treating with an oxidizing gas at a temperature of at least 450 DEG C. for at least 5 minutes, then mixed with a carbonaceous binder, and tempered in an atmosphere containing at least 4% O2 at 200-300 DEG C. for at least 40 mins. Activation is preferably effected in an atmosphere of steam and air, e.g. 70-85% steam, at 500-700 DEG C for 10-30 minutes, or in air at 450-550 DEG C for 5-10 minutes, in fluid, fixed, or moving bed, with counter- or con-current flow, or in a rotating drum. The mixture may be compacted, e.g. at 100-200 DEG C. and 10-24,000 p.s.i. before or after tempering. It may contain 1/2 -1% of MnO, S, MgO, and/or CaO to accelerate tempering, and up to 35% CaO or Fe ore may also be incorporated. The compact is then calcined, e.g. at 700-940 DEG C., to give a product of crushing strength greater than 1500 lb./sq. inch and real density 1.05-1.35 g./c.c. Suitable binders are aromatic tars, coal tar pitch, gilsonite, coking residues, and heavy petroleum residues, e.g. asphalt, used in amounts of 10-25%. The petroleum coke may be obtained from "delayed," "fluid" or "continuous contact" processes, and should be less than 1/16 inch in size.