Method of rapid treatment of heavy metal sludge and preparation of ferrite magnets
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United States of America Patent
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Dec 13, 2022
Grant Date -
Nov 18, 2021
app pub date -
May 6, 2021
filing date -
May 13, 2020
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Abstract
A method of rapid treatment of heavy metal sludge and preparation of ferrite magnets comprises following steps of: providing a sludge, the sludge at least having zinc metal and ferrous metal; adding an iron-containing substance to the sludge; pickling the sludge and the iron-containing substance with sulfuric acid to obtain a pickling solution with zinc ions and iron ions; neutralizing the pickling solution with sodium hydroxide to form hydroxide precipitates; and airing and heating the neutralized pickling solution by an ultrasonic-microwave method so that the hydroxide precipitates undergoing a ferrite magnet reaction, thereby obtaining ferrite magnets with a spathic structure.
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