Process for producing low-ash, low-sulfur coal
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1985-05-14
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Iowa State University Research Foundation, Inc.
The Iowa State University Research Foundation (ISURF) seeks to protect the intellectual property (including new discoveries, technologies, or creative works) of the university's students & faculty which is continuously created through research and other undertakings. It seeks to manage, protect, and own all intellectual property on behalf of the university. The Iowa State University Research Foundation was created in 1938.
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Abstract
Pyritic sulfur, organic sulfur, and ash-forming minerals are removed from coal by a 2-stage alkaline treatment, using sodium carbonate or bicarbonate as the reagent. The first stage is an alkaline oxidation at moderate temperatures (130°-150° C.), and the second stage is a non-oxidizing alkaline treatment at a much higher temperature (250°-330° C.). The alkaline treated coal is extracted with an aqueous mineral acid, preferably hot aqueous sulfuric acid (H2 SO4) followed by washing with hot water. The resulting low-ash, low-sulfur coal can be used as a fuel in oil-firing boilers, and for similar applications where minimal-ash content is a basic requirement.