Patents Assigned to John Stephens
  • Patent number: 4565794
    Abstract: Sericitic clays can be treated so as to produce silica gel and an adsorbent, absorbent product capable of being utilized in many different applications. In treating such clays to produce such products, finely ground clay particles are digested with an alkali so as to produce an alkali silicate solution which is separated from the remaining inorganic material. The latter is digested with an acid so as to remove alumina values. The particles remaining should then be washed and dried prior to being used as an adsorbent, absorbent material. The alkali silicate solution is preferably subjected to electrolysis to bleach contaminants within the solution and then treated with an acid so as to gel the silicate. After the gel is formed, the gel and the solution are neutralized. The gel is then separated and dried.
    Type: Grant
    Filed: December 16, 1983
    Date of Patent: January 21, 1986
    Assignee: John Stephens
    Inventor: Francis de Buda