US PATENT SUBCLASS 423 / 34
.~.~.~ Forming insoluble substance in liquid

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}
23  DF  .~ Group IB metal (Cu, Ag, or Au) {10}
27  DF  .~.~ Leaching, washing, or dissolving {6}
34.~.~.~ Forming insoluble substance in liquid {3}
35  DF  .~.~.~.~> Forming oxide or carbonate
36  DF  .~.~.~.~> Sulfating
37  DF  .~.~.~.~> Sulfiding

DEFINITION

Classification: 423/34

(under subclass 27) Processes wherein a liquid or slurry is treated to form a substance which is insoluble therein, and comes out of solution or wherein the composition of the liquid is changed so that one part of the mixture becomes insoluble therein, so the insoluble substance can be separated from the liquid and the materials which remain

soluble in the liquid.

(1) Note. Included under this definition of insolubilization is that wherein a substance crystallizes out of solution due to temperature or concentration change.

(2) Note. The compounds formed by the titles specifically set out in the indented subclasses need not be those which come out of the solution; they may remain soluble while others formed by the process precipitate out.

SEE OR SEARCH THIS CLASS, SUBCLASS:

42+, for a process of forming an insoluble substance in a liquid which process does not involve a leaching step.

SEE OR SEARCH CLASS 75, Specialized Metallurgical Processes, Compositions for Use Therein, Consolidated Metal Powder Compositions, and Loose Metal Particulate Mixtures,

101+, for a process of obtaining a pure elemental metal, which includes the step of chemical leaching and which may involve precipitating a substance or causing it to come out of solution; and subclasses 106+ for a process of obtaining a pure elemental element by causing it or a compound thereof to come out of solution and which involves leaching with a cyanide compound.