Method to control fugitive dust and sodium hydroxide in bauxite

Details Method to control fugitive dust and sodium hydroxide in bauxite Method to control fugitive dust and sodium hydroxide in bauxite

1997-02-05

1998-05-05

Bell, Janyce

Coating processes

Coating pavement or the earth

427154, 427180, 427201, B05C 512

Patent

active

057471045

ABSTRACT:
A method for controlling both fugitive bauxite dust and sodium hydroxide contamination generated by the waste disposal of bauxite tailings from aluminum processing plants comprising using magnesium chloride or sodium chloride or mixtures thereof on the surface of the disposal pits, which are also known as mud lakes. Preferably, a solution of magnesium chloride is applied to the surface of a dry or partially dry mud lake. The magnesium chloride neutralizes the sodium hydroxide on the surface, forms a hard crust that covers the fine bauxite particles and also inhibits the migration of unreacted sodium hydroxide to the surface.

REFERENCES:
patent: 4594268 (1986-06-01), Kirwin

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