The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 03, 1992
Filed:
Dec. 11, 1989
Roy H Werner, Pittsburgh, PA (US);
Clifford J Decker, Bethel Park, PA (US);
Barrett Haentjens & Co., Hazleton, PA (US);
Abstract
Method and apparatus for treating sulphur bearing coal comprising pulverizing the coal, mixing it with water, a reagent and free air and pumping the resulting mixture to a classifier to separate the coal from sulphur and clay, all at the mine site. The resulting pure coal slurry is then pumped to a plant site where it is mixed with acid and bacteria. The resulting slurry is pumped to a bacteria digester wherein it is recirculated to provide maximum contact of bacteria and coal, completing the removal of sulphur. The resulting slurry is introduced into a mixer wherein the bacteria is neutralized by a reagent, raising the pH above 7 to destroy the bacteria and simultaneously aerating the mixture to treat the effuent. The desulphurized coal is treated by drying apparatus to provide a final purified coal product.