The Dow Chemical Company

Donald E Leonard

Richard R Klimpel

Basil S Fee

Kevin A Frazier

Robert D Hansen

Gordon D McCann

The separation of silica or siliceous gangue from one or more desired minerals in an aqueous slurry via mechanical apparatus is improved by the addition of a small amount of an alkanol amine to the slurry. Examples of separation techniques benefiting from this technology include cyclones, tables and spiral separators.

Solid-solid separations utilizing alkanol amines

Dialkylated aryl monosulfonic acids or salts thereof or their mixture are useful as collectors in the flotation of minerals, particularly oxide minerals. Particularly useful are those sulfonic acids or salts in which the alkyl substituents are unsymmetrical. Collector compositions comprising these salts and sulfide collectors such as xanthates are useful in flotations conducted at natural pH of the slurry.

Dialkylated aryl monosulfonate collectors useful in the flotation of

Dialkylated aryl sulfonic acids or salts thereof or their mixture are useful as collectors in the flotation of minerals, particularly oxide minerals. Collector compositions comprising these salts and oleic acid are particularly useful in hard water. Collector compositions comprising these salts and sulfide collectors such as xanthates are useful in flotations conducted at natural pH of the slurry.

Sulfonated and carboxylate collector compositions useful in the

The efficiency of grinding of silica-containing solids such as mineral ores is improved by the addition of alkanol amines as a grinding aid. Examples of useful amines include diethanol amine, ethanol amine, triethanol amine and mixtures thereof.

Alkanol amine grinding aids

A flotation process is disclosed wherein the selectivity to the valuable mineral is improved by the depression of silica or siliceous gangue by the use of a hydroxy-containing compound such as an alkanol amine. The process is useful in the flotation of oxide minerals as well as in sulfide flotation.

Depression of the flotation of silica or siliceous gangue in mineral

Alkylated diaryl oxide monosulfonic acids or salts thereof or their mixture are useful as collectors in the flotation of minerals, particularly oxide minerals.

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Shepherd, MI, United States of America

Donald E Leonard