Patent ID: 9475699
Filing Date: 2016-10-25
CPC Classification: B01J,B82Y,C01B,C21C,C22B

Claim Text:
1. A method of treating an offgas containing at least one carbon oxide gas, water vapor, and particulate matter to produce solid carbon from the carbon oxide gas, the method comprising: purifying an offgas from at least one of an aluminum smelter or a steel smelter to remove at least a portion of particulate matter therefrom to produce an intermediate stream; condensing water vapor from the intermediate stream to produce a dried carbon oxide feedstock gas; mixing at least one reducing gas with the carbon oxide feedstock gas to form a reaction gas mixture; converting at least a portion of the carbon in the reaction gas mixture to solid carbon and a tail gas stream containing water vapor; and recycling at least a portion of the solid carbon to the at least one of the aluminum smelter or the steel smelter to form the offgas and at least one of a metal matrix composite, electrodes for electric arc furnaces, carbon raisers, or high purity carbon reducing agents.