Invention Grant
- Patent Title: Production of phosphate compounds from materials containing phosphorus and at least one of iron and aluminium
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Application No.: US16017839Application Date: 2018-06-25
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Publication No.: US10745279B2Publication Date: 2020-08-18
- Inventor: Yariv Cohen , Patrik Enfält
- Applicant: EASYMINING SWEDEN AB
- Applicant Address: SE Uppsala
- Assignee: EASYMINING SWEDEN AB
- Current Assignee: EASYMINING SWEDEN AB
- Current Assignee Address: SE Uppsala
- Agency: Porter Wright Morris & Arthur LLP
- Priority: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@10af5a
- Main IPC: C01B25/32
- IPC: C01B25/32 ; C01B25/28 ; C01B25/36 ; C01B25/37 ; C01G49/02 ; C01G49/10 ; C01G49/14 ; C01F7/34 ; C01F7/56 ; C01F7/74 ; C01G45/02 ; C01G49/00 ; C01G1/12 ; C05B11/12 ; C05B11/16 ; C05F7/00 ; C02F11/00 ; C01F11/46 ; C02F1/66 ; C02F101/10
Abstract:
A method for production of phosphate compounds comprises dissolving of a raw material comprising phosphorus, aluminium and iron, in a mineral acid. Insoluble residues from the dissolving step are separated. Iron hydroxide is added causing precipitation of phosphate compounds. The precipitated phosphate compounds are removed. The phosphate compounds are dissolved by an alkaline solution. Iron hydroxide is filtered out. Lime is added, causing precipitation of calcium phosphate. The precipitated calcium phosphate is separated. The leach solution after the separating of precipitated calcium phosphate is recycled to be used for dissolving phosphate compounds by an alkaline solution.
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