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公开(公告)号：CA1256268A
公开(公告)日：1989-06-27
申请号：CA490766
申请日：1985-09-16
Applicant: HOECHST AG
Inventor： RESSEL HERBERT , HAAS HANS , KRAUSE JOHANNES
Abstract: PROCESS FOR REDUCING IRON AND VANADIUM IN PHOSPHORIC ACID SOLUTION Iron and vanadium in phosphoric acid solution are reduced. To this end, the phosphoric acid solution is contacted with ferrophosphorus which is used as the reductant.
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公开(公告)号：NO870600A
公开(公告)日：1987-08-18
申请号：NO870600
申请日：1987-02-16
Applicant: HOECHST AG
Inventor： SCHIMMEL GUENTHER , KOLKMANN FRIEDRICH , GRADL REINHARD , RESSEL HERBERT
IPC: C01B25/222 , C01B25/22 , C01B25/223 , C01B25/00
CPC classification number: C01B25/2208 , C01B25/223
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公开(公告)号：CA1217025A
公开(公告)日：1987-01-27
申请号：CA454809
申请日：1984-05-22
Applicant: HOECHST AG
Inventor： SCHIMMEL GUNTHER , RESSEL HERBERT , HEYMER GERO , GRADL REINHARD
IPC: C01B25/237 , C01B25/30
Abstract: PROCESS FOR DEFLUORINATING ALKALI METAL PHOSPHATE SOLUTIONS The disclosure relates to a process for defluorinating alkali metal phosphate solutions. To this end, the disclosure provides for an alkali metal phosphate solution neutralized to a pH-value of more than 6 and pre-purified to be stirred at 60 to 120.degree.C into an alkaline earth metal compound. Alkaline earth metal compounds with a solubility in water of less than 5 g/l are used in the form of particles of which more than 50 % have a size of less than 8 .mu.m. After a reaction period of 0.5 to 4 hours, the precipitate obtained is separated from the purified alkali metal phosphate solution.
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公开(公告)号：ZA8404737B
公开(公告)日：1985-02-27
申请号：ZA8404737
申请日：1984-06-22
Applicant: HOECHST AG
Inventor： SCHIMMEL GUENTHER , RESSEL HERBERT , HEYMER GERO , GRADL REINHARD
CPC classification number: C01B25/308
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公开(公告)号：MX161627A
公开(公告)日：1990-11-23
申请号：MX20175484
申请日：1984-06-22
Applicant: HOECHST AG
Inventor： SCHIMMEL GUNTHER , RESSEL HERBERT , HEYMER GERO , GRADL REINHARD
IPC: C01B25/237 , C01B25/30
Abstract: The disclosure relates to a process for defluorinating alkali metal phosphate solutions. To this end, the disclosure provides for an alkali metal phosphate solution neutralized to a pH-value of more than 6 and pre-purified to be stirred at 60 DEG to 120 DEG C. into an alkaline earth metal compound. Alkaline earth metal compounds with a solubility in water of less than 5 g/l are used in the form of particles of which more than 50% have a size of less than 8 mu m. After a reaction period of 0.5 to 4 hours, the precipitate obtained is separated from the purified alkali metal phosphate solution.
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Patent Agency Ranking
公开(公告)号：NO870600D0
公开(公告)日：1987-02-16
申请号：NO870600
申请日：1987-02-16
Applicant: HOECHST AG
Inventor： SCHIMMEL GUENTHER , KOLKMANN FRIEDRICH , GRADL REINHARD , RESSEL HERBERT
IPC: C01B25/222 , C01B25/01 , C01B25/22 , C01B25/223 , C01B25/00
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公开(公告)号：ZA861099B
公开(公告)日：1986-10-29
申请号：ZA861099
申请日：1986-02-14
Applicant: HOECHST AG
Inventor： KOLKMANN FRIEDRICH , RESSEL HERBERT , GRADL REINHARD , SCHIMMEL GUENTHER
IPC: C01B25/22 , C01B25/225 , C01B25/226 , C01B
Abstract: Wet-process phosphoric acid is made by subjecting a phosphate ore to processing treatment with a mineral acid resulting in the formation of a processed suspension. The formation of silicofluorides is obviated by adding, either to the phosphate ore or the processed suspension, a quantity of an aluminum compound soluble in phosphoric acid sufficent for the processed suspension to present an aluminum concentration of 0.3 to 1.0 wgt %, based on P2O5.
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公开(公告)号：NO170923B
公开(公告)日：1992-09-21
申请号：NO870600
申请日：1987-02-16
Applicant: HOECHST AG
Inventor： SCHIMMEL GUENTHER , KOLKMANN FRIEDRICH , GRADL REINHARD , RESSEL HERBERT
IPC: C01B25/222 , C01B25/01 , C01B25/22 , C01B25/223
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公开(公告)号：CA1248736A
公开(公告)日：1989-01-17
申请号：CA490767
申请日：1985-09-16
Applicant: HOECHST AG
Inventor： RESSEL HERBERT , WESTPHAL WILHELM
Abstract: APPARATUS FOR REDUCING IRON AND VANADIUM IN PHOSPHORIC ACID SOLUTION Apparatus for reducing iron and vanadium in phosphoric acid solution with the aid of a granular reductant. The apparatus is comprised of a drum rotatable around its transverse axis. It is partially filled with the granular reductant and provided with inlets for supplying the phosphoric acid solution, the granular reductant and an inert gas, and also with a reaction product outlet.
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公开(公告)号：ZA8601099B
公开(公告)日：1986-10-29
申请号：ZA8601099
申请日：1986-02-14
Applicant: HOECHST AG
Inventor： KOLKMANN FRIEDRICH , RESSEL HERBERT , GRADL REINHARD , SCHIMMEL GUENTHER
IPC: C01B25/22 , C01B25/225 , C01B25/226 , C01B
CPC classification number: C01B25/2208 , C01B25/225 , C01B25/226
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