CHEMICAL PROCESSING OF STRUVITE

A method for decomposing struvite comprises dissolving (S10), in sulphuric acid, of a feed material comprising struvite, thereby forming a solution. Phosphate ions are removed (S20) from the solution. Magnesium compounds are precipitated (S40) from the solution, after the removing of phosphate ions....

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Bibliographic Details
Main Authors ENFÄLT, Patrik, SVÄRD, John, HÖGBERG, Carl-Johan, COHEN, Yariv
Format Patent
LanguageEnglish
French
German
Published 06.04.2022
Subjects
AMMONIA
CHEMISTRY
COMPOUNDS THEREOF
CYANOGEN
FERTILISERS
INORGANIC CHEMISTRY
MANUFACTURE THEREOF
METALLURGY
ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
PHOSPHATIC FERTILISERS
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Summary:A method for decomposing struvite comprises dissolving (S10), in sulphuric acid, of a feed material comprising struvite, thereby forming a solution. Phosphate ions are removed (S20) from the solution. Magnesium compounds are precipitated (S40) from the solution, after the removing of phosphate ions. This precipitation of magnesium compounds is caused by increasing a pH of the solution. By the precipitation of magnesium compounds a solution comprising ammonium sulphate is formed. An arrangement for performing the method is also disclosed. Also, a method for recovering at least one of nitrogen, phosphorus and potassium from waste material comprises precipitating of struvite from an initial liquid of waste material, by adding a magnesium source to said initial liquid of waste material and adjusting a pH to an alkaline pH, separating the precipitated struvite from the initial liquid of waste material and decomposing the separated struvite by a method according to the above concepts.
Bibliography:Application Number: EP20200814126