Process for making a fuel product from coal fines and sewage sludge

  • US 6,214,064 B1
  • Filed: 02/07/2000
  • Issued: 04/10/2001
  • Est. Priority Date: 08/13/1997
  • Status: Expired due to Term
First Claim
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1. A process for making a fuel product comprising:

  • blending a sewage sludge with a sulfamic acid, said sewage sludge having a solids content of greater than 7% by weight;

    mixing an oxide-containing chemical with the blended sludge so as to cause a reaction which elevates a temperature of the sludge, said oxide-containing chemical selected from the group consisting of calcium oxide and calcium hydroxide;

    pressurizing the mixed sludge to a pressure of greater than 14.7 p.s.i.a. for a period of time of no less than 15 seconds;

    passing the pressurized mixed sludge through a flash chamber;

    mixing the pressurized mixed sludge with coal fines subsequent to the step of passing the pressurized mixed sludge through the flash chamber; and

    solidifying the mixture of pressurized mixed sludge and coal fines such that the solified mixture has between 40% and 95% inclusive by weight of coal fines.

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