Precipitation of scale-forming materials from solution

Details Precipitation of scale-forming materials from solution Precipitation of scale-forming materials from solution

1982-12-10

1987-08-11

Hart, Charles

Concentrating evaporators

Processes

Involving waste liquid

159DIG13, 202DIG1, B01D 100

Patent

active

046860037

ABSTRACT:
Scale-forming metal oxides and carbonates, such as cupric oxide, can be precipitated from an ammoniacal leaching solution with minimum scale buildup by distilling the solution in an externally heated distillation chamber mounted for rotation about a generally horizontal axis. The distillation chamber includes a plurality of axially spaced annular baffles defining a plurality of compartments containing a tumbling medium, such as spherical balls. The solution is continuously introduced into the inlet end of the chamber and heated under pressure to a temperature above its boiling point as it flows over the baffles toward the outlet end of the chamber. A slurry containing the precipitated cupric oxide is continuously withdrawn from the outlet end and the evaporated gases are continuously withdrawn from the inlet end. The balls rub against each other, the interior of the chamber, and the sides of the baffles, as the chamber is rotated at a non-centrifuging speed, to provide a grinding or scrubbing action which minimizes a scale buildup of the precipitating cupric oxide.

REFERENCES:
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patent: 1940955 (1933-12-01), Laird
patent: 2022054 (1935-11-01), Reed et al.
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patent: 2511742 (1950-06-01), Shafer
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patent: 4345975 (1982-08-01), Abe et al.
Cuthbert et al.; "Stripping with Simultaneous Solids Generation Using Turbulent Bed Contactor"; presentation at the CIM Conference of Metallurgists; Aug. 28, 1978.

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