PROCESSING OF PHOSPHATE COMPOUNDS

A method for processing of phosphate compounds comprises providing (S10) of a primary liquid being an acid solution comprising at least phosphorous. Phosphate compounds comprising iron are precipitated (S20) from the primary liquid by adding (S22) a first additive material to the primary liquid. The...

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Bibliographische Detailangaben
Hauptverfasser:	NORDSTRÖM, Michael, COHEN, Yariv
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOUNDS THEREOF INORGANIC CHEMISTRY METALLURGY NON-METALLIC ELEMENTS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION THEIR RELEVANT APPARATUS TRANSPORTING TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:	A method for processing of phosphate compounds comprises providing (S10) of a primary liquid being an acid solution comprising at least phosphorous. Phosphate compounds comprising iron are precipitated (S20) from the primary liquid by adding (S22) a first additive material to the primary liquid. The first additive material comprises iron hydroxide and a solid filter-aid material. First solid matter, comprising the precipitated phosphate compounds and the solid filter-aid material is separated (S28) by a first filtering. The separated first solid matter is exposed (S30) for an alkaline solution, causing a dissolution (S32) of phosphate compounds and precipitation (S32) of iron hydroxide, which gives a secondary liquid. Second solid matter comprising the precipitated iron hydroxide and the solid filter-aid material is removed (S38) by a second filtering. Part of the second solid matter is recycled (S40) as the first additive material. A system for processing of phosphate compounds is also disclosed.