Upgrading coal for coking purposes
OwnerHans Helmut Hahninventor
Life of this patent
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Abstract
The invention relates to the upgrading of coal for coking purposes and improved cokes resulting from such upgrading. Pitch obtained as a by-product of pressure-gasification (Lurgi-process) is used as an additive either alone or blended with SRC. The additive is employed in amounts of 1% and 50% by mass, preferably 5 to 15% of the total blend. The additive preferably has an R-and-B softening temperature above 80.degree. C. The additive can be subjected to various treatments, e.g. heating in presence of hydrogen, to improve its characteristics. BACKGROUND OF THE INVENTION
Claims12
Method of upgrading coal for coking purposes which comprises blending said coal with more than 1 and less than 50% by weight (mass) based on the total blend of an additive comprising a pitch-like high-boiling fraction or distillation residue boiling above 270.degree. C. of a tar formed as a by-product of the pressure-gasification of coal in the presence of steam and oxygen to yield a gas comprising carbon monoxide, hydrogen and carbon dioxide.
Coke, being the product of carbonisation under coke-oven conditions of a blend of between 50 and 99% by weight (mass) of coal and between 1 and 50% by weight (mass)of an additive comprising a pitch-like, high-boiling fraction or distillation residue boiling above 270.degree. C. of a tar formed as a by-product of the pressure-gasification of coal in the presence of steam and oxygen to yield a gas comprising carbon monoxide, hydrogen and carbon dioxide.
An additive for upgrading coal for coking purposes which comprises from 30 to 100% by weight (mass) of a pitch-like, high-boiling fraction or distillation residue boiling above 270.degree. C. of a tar formed as a by-product of the pressure-gasification of coal in the presence of steam and oxygen to yield a gas comprising carbon monoxide, hydrogen and carbon dioxide, said fraction or residue having been heat-treated to yield a ring-and-ball softening point of not less than 100.degree. C., and from 0 to 70% by weight (mass) of SRC.
A coke making process which comprises blending between 99 and 50 percent by weight (mass) of a suitable coal and between 1 and 50% by weight (mass) of an additive of which at least 30% by weight (mass) is a pitch-like, high-boiling fraction or distillation residue boiling above 270.degree. C of a tar formed as a by-product of the pressure-gasification of coal in the presence of steam and oxygen to yield a gas comprising carbon monoxide, hydrogen and carbon dioxide and between 0 and 70% by weight (mass) of SRC, and subjecting the resulting blend to carbonisation in a coke-making apparatus.
Dependencies are inferred from the claim text.