Fine, uniform particles, and precipitation or depositing of part

Details Fine, uniform particles, and precipitation or depositing of part Fine, uniform particles, and precipitation or depositing of part

1984-07-24

1987-06-02

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204420, 204433, 204 1R, C25B 100

Patent

active

046701141

ABSTRACT:
The precipitation or deposition of particles from a solution in a cell (61) which an electric field is applied between an anode (65,67,68) and a cathode (66), typically an electrolysis cell for the co-precipitation of mixed oxides but also cells for electrodeposition or the electrophoretic deposition of colloidal particles, is controlled by measuring the pH of the solution in the cell using a probe (72) shielded in a tube (73) from the migrating electric current and from gas bubbles. The pH of the solution is then adjusted to a selected value as a function of the measured pH, e.g. by varying the electrolysis current or by bubbling in acid vapor, air or base vapor.

REFERENCES:
patent: 2563062 (1951-08-01), Perley
patent: 2607718 (1952-08-01), Suthard
patent: 3214301 (1965-10-01), Pocock et al.
patent: 3869359 (1975-03-01), Beer
patent: 4152215 (1979-05-01), Yoshino et al.
patent: 4474653 (1984-10-01), Beer et al.

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