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Solid fuel and a process for its combustion

  • US 4,741,278 A
  • Filed: 04/08/1986
  • Issued: 05/03/1988
  • Est. Priority Date: 09/03/1984
  • Status: Expired due to Fees
First Claim
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1. Process for the production of pellets from finely divided coal or carbonaceous materials, using a first heat hardening binding agent which is water-soluble or water-swellable, and a second binding agent based on aqueous emulsions of heavy hydrocarbons, the process comprising the steps of:

  • (a) forming a mixture by adding to the coal (i) up to 10% by weight calculated on the coal (daf) of calcium oxide; and

    (ii) 0.1 to 5%, calculated on coal (waf), of iron in the form of an iron compound selected from the group consisting of iron oxide, iron carbonate, elemental iron, substantially halogen free and sulfate free, iron rich minerals and substantially halogen free and sulfate free, iron rich technical by-products;

    (b) agglomerating said mixture with said binding agent in a pelletising device to produce a concentration gradient of binding agent in the pellets by controlled addition of said firt and second binding agents in the course of pelletisation, so that the concentration of the first binding agent decreases from the inside of the pellet to the outside and that of the second binding agent decreases from the outside to the inside; and

    (c) thermally drying and subsequently thermally hardening the pellets.

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