US PATENT SUBCLASS 423 / 151
.~.~ Converting metal to magnetic form

Current as of: June, 1999
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423 /   HD   CHEMISTRY OF INORGANIC COMPOUNDS

1  DF  TREATING MIXTURE TO OBTAIN METAL CONTAINING COMPOUND {15}
138  DF  .~ Iron group metal (Fe, Co, or Ni) {7}
151.~.~ Converting metal to magnetic form {1}
152  DF  .~.~.~> At specified temperature

DEFINITION

Classification: 423/151

(under subclass 138) Processes including the step of changing a metal from a nonmagnetic to a magnetic form.

(1) Note. Although many patents in this subclass are drawn to "magnetic roasting", i.e., roasting of Fe2 deg.3 to form magnetic Fe3 deg.4 (FeO. Fe2 deg.3) other forms of conversion from nonmagnetic to magnetic forms may also be found.

(2) Note. Magnetic separation may also be included in the processes classified in this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

148, for similar processes wherein a fluidized bed is utilized.

632+, for patents wherein Fe3O4 is made from a relatively pure starting material.

SEE OR SEARCH CLASS 209, Classifying, Separating, and Assorting Solids, appropriate subclasses, especially

38, 40 and 212-232, for processes and apparatus for magnetic separating of materials, including ores, where no chemical change takes place.