Patents by Inventor Rudiger Scheel

Rudiger Scheel has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of processing waste sludge from wet phosphoric acid purification acid purification facilities
    Patent number: 4300939
    Abstract: A method for processing waste sludge from wet phosphoric acid purification facilities wherein steelworks slag is separately ground, the ground slag then is force-mixed and granulated together with the waste sludge.
    Type: Grant
    Filed: June 30, 1980
    Date of Patent: November 17, 1981
    Assignee: Uhde GmbH
    Inventors: Martin Hater, Fritz Meininghaus, Rudiger Scheel
  • Method of processing waste sludge from wet phosphoric acid purification facilities
    Patent number: 4257898
    Abstract: The invention relates to a method of processing the waste sludge obtained in purification facilities for phosphoric acid produced by the wet process. The composition of this sludge is such that it cannot be utilized for any purpose in this state. It is known that sludge from wet phosphoric acid purification facilities contains different quantities of certain substances, the concentrations being such that these substances may not be allowed to mix with surface water or ground water under any circumstances, not even in the case of dumps. A typical composition of such waste sludge is as follows:______________________________________ Fe 9.0% by weight P.sub.2 O.sub.5 21.0% by weight CaO 6.2% by weight SiO.sub.2 12.5% by weight MgO 5.8% by weight Al.sub.2 O.sub.3 2.7% by weight Cr.sub.2 O.sub.3 0.7% by weight V.sub.2 O.sub.5 0.6% by weight Na.sub.2 O 18.0% by weight K.sub.2 O 0.3% by weight F 1.7% by weight C 2.5% by weight S 0.3% by weight Remainder* 18.7% by weight 100.
    Type: Grant
    Filed: December 3, 1979
    Date of Patent: March 24, 1981
    Assignee: Uhde GmbH
    Inventors: Peter Meurer, Martin Hater, Fritz Meininghaus, Rudiger Scheel
  • Method of processing waste sludge from wet phosphoric acid purification facilities
    Patent number: RE31179
    Abstract: The invention relates to a method of processing the waste sludge obtained in purification facilities for phosphoric acid produced by the wet process. The composition of this sludge is such that it cannot be utilized for any purpose in this state. It is known that sludge from wet phosphoric acid purification facilities contains different quantities of certain substances, the concentrations being such that these substances may not be allowed to mix with surface water or ground water under any circumstances, not even in the case of dumps. A typical composition of such waste sludge is as follows:______________________________________ Fe 9.0% by weight P.sub.2 O.sub.5 21.0% by weight CaO 6.2% by weight SiO.sub.2 12.5% by weight MgO 5.8% by weight Al.sub.2 O.sub.3 2.7% by weight Cr.sub.2 O.sub.3 0.7% by weight V.sub.2 O.sub.5 0.6% by weight Na.sub.2 O 18.0% by weight K.sub.2 O 0.3% by weight F 1.7% by weight C 2.5% by weight S 0.3% by weight Remainder* 18.7% by weight 100.
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: March 15, 1983
    Assignee: Uhde GmbH
    Inventors: Peter Meurer, Martin Hater, Fritz Meininghaus, Rudiger Scheel