Systems and methods to chemically treat metal-bearing waste streams to recover value-added materials

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United States of America Patent

PATENT NO 11066723
APP PUB NO 20200239978A1
SERIAL NO

16752477

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Abstract

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Disclosed herein are system and methods to effectively leach coal ash with hydrochloric acid and separate an insoluble silica product and then selectively precipitate, from the leachate, a number to value-added, strategic, marketable products using a hydroxide reagent. The resulting precipitated products include iron, aluminum, magnesium, calcium, and a mixture of rare earth elements and transition metals. These can be separated as hydroxides or converted to oxides or carbonates. Using hydrochloric acid for leaching and converting the chloride to sodium chloride in the final step results in practically no waste for this process. The silica can be further purified using sodium hydroxide fusion or caustic leach methods and some minor streams from this process are recycled to minimize any waste stream. These systems and methods can be applied to a number of other industrial waste products such as red mud from the aluminum process, slag from steel furnaces, mine tailings, and other metal-bearing waste streams.

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Patent Owner(s)

Patent OwnerAddress
DAVY POWERSPORTS INC360 TORMEY LANE SUITE 292 BAINBRIDGE ISLAND WA 98110

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Papouchado, Lucien Aiken, US 2 1
Preston, Joseph Bainbridge Island, US 16 1209
Scheetz, Barry E Lemont, US 9 94

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