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Chem Pro

Sidney M Heins

Zinc is separated from a zinc-copper alloy, in particular, brass scrap, by reacting the alloy with an aqueous alkali metal bisulfate to dissolve zinc selectively with respect to copper. Zinc is recovered from the resulting solution by precipitation in the form of an insoluble zinc compound, namely, zinc carbonate or zinc hydroxide.

Separation of zinc from a zinc-copper alloy

A low-cost method of taking sulfur out of coal in stoker furnaces comprising mixing the coal with natural-occurring flue dust from steel-making, pulverized red mud from aluminum-making, of pulverized retort residues from zinc-making, or a pulverized prepared material comprising principally the ferrites and oxides of certain minerals and at least a trace of ferric oxide as a catalyst for accelerating the conversion of sulfur dioxide to sulfur trioxide and heating the mixture in the combustion zone of the furnace in the presence of water vapor from the fuel to form sulfuric acid for oxidizing said natural-occurring or prepared sulfur dioxide absorbent materials into sulfates and precipitating the same along with ash in the fuel to the bottom of the furnace.

Method for removal of sulfur from coal in stoker furnaces

A process using run-of-the-mill flue dust from open hearth and basic oxygen steel making processes having certain iron-zinc values as a sulfur dioxide absorbent and pollutant control for industrial and public utility furnace flue gases, which materials, upon solid dry injection into a chemical reaction zone of an industrial or public utility furnace in an amount in excess over stoichiometric, results in substantial dry removal of the sulfur dioxide therefrom, and from which reaction products are cleaned by conventional gas cleaning apparatus.

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Chicago, IL, United States of America

Sidney M Heins