Stamp milling and cyaniding by Thomson Francis Andrew 1876-

Author:Thomson, Francis Andrew, 1876-
Language: eng
Format: epub
Tags: Ore-dressing, Cyanide process
Publisher: New York, McGraw-Hill
Published: 1915-03-25T05:00:00+00:00

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one hearth to the other. The multiple-hearth feature effects a saving of fuel. The costs and results, otherwise, are about the same as with the Edwards.

Roasting furnaces are also used to some extent as a means of (Aloridizing sulphide silver ores preliminary to cyanide treatment.

BIBLIOGRAPHY FOR PREPARATION OF ORES FOR CYANIDE

TREATMENT

* BspeckUy Desirable for Students' Use Classification.

Ayton, Ernest F. The Ayton Pulp-Thickener for Tube-mill Feed. Pac. Min., Vol. 17, p. 403 (1910).

Ayton, Ernest F. Sand and Slime Separation, Arianena Mill, 1 p. Mex. Min. Jour., Vol. 16, p. 87 (1913).

Dorr, J. V. N. The Dorr Classifier, 1 p. Min. & Min., Vol. 28, p. 341 (1908).

Huntley, Rollo E. Slime Settler or Dewaterer, f p. Min. & Min., Vol. 31, p. 339 (1911).

* Neal, Walter. Diaphragm Cones and Tube Milling, 3i pp. Min. & Sci. Press, Vol. 100, p. 483 (1910).

* Smart, G. O. The Tube Mill Circuit and Classification, 4 pp. (Abstract from J. C. M. & M. Soc, S. A., Feb., 1910.) Min. Sci., Vol. 61, p. 392 (1910).

Roasting.

* VON Bernewitz, M. W. Roasting at Kalgoorlie, 1 p. Min. & Sci. Press, Vol. 102, p. 660 (1911).

Edwards, J. E. Notes on Ore Roasting, 5 pp. Min. Sci., Vol. 61, p. 220 (1910).

"Metallurgist." Roasting at Kalgoorlie, 2 pp. Min. & Sci. Press, Vol. 101, p. 50 (1910).

* SciBiRD, G. H. & Mack, R. L. The Roasting of Telluride Ores. Min. & Sci. Press, Vol. 95, pp. 751, 777 (1907).

CHAPTER X

DISSOLVING THE GOLD AND SILVER

The chemistry of solution has already been touched upon; in addition to the reactions involved, the following points are of importance in dissolving gold and silver from ores:

(1) Strength of the solution.

(2) Temperature of the solution.

(3) Condition of the gold or silver particles.

(4) Presence of cyanicides.

(5) Arnount of solution.

(1) Strength of Solution. Under ordinary conditions of temperature and pressure the solubility of gold and silver is dependent,

according to Julian and Smart,* upon the following circumstances:

(1) The number and velocity of the migratory ions and oxygen molecules that take part in the dissolving of the metals.

(2) The difference of potential between two parts of the metallic surface in contact with the solution.

Christy, whose work upon the electromotive force of metals in cyanide solutions f has become one of the few classics of cyanide literature, states it somewhat differently. According to his view the solubility of gold is dependent upon:

(1) The electromotive force of the gold itself, which is insuflSc-ient for the purpose.

* Cyaniding Gold and Silver Ores, 1904, page 77. t Trans. A.I.M.E., Vol. 30, page 864-946.

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