UST105602I4 - Thermal treatment of phosphate rock - Google Patents
Thermal treatment of phosphate rock Download PDFInfo
- Publication number
- UST105602I4 UST105602I4 US06/648,412 US64841284A UST105602I4 US T105602 I4 UST105602 I4 US T105602I4 US 64841284 A US64841284 A US 64841284A US T105602 I4 UST105602 I4 US T105602I4
- Authority
- US
- United States
- Prior art keywords
- phosphate rock
- organic matter
- thermal treatment
- prior
- calcined product
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002367 phosphate rock Substances 0.000 title abstract 4
- 238000007669 thermal treatment Methods 0.000 title abstract 2
- 238000000034 method Methods 0.000 abstract 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 abstract 2
- 230000009286 beneficial effect Effects 0.000 abstract 2
- 238000010438 heat treatment Methods 0.000 abstract 2
- 239000005416 organic matter Substances 0.000 abstract 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 abstract 1
- 239000002253 acid Substances 0.000 abstract 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 abstract 1
- 229910052586 apatite Inorganic materials 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000001354 calcination Methods 0.000 abstract 1
- 125000005587 carbonate group Chemical group 0.000 abstract 1
- 239000013078 crystal Substances 0.000 abstract 1
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 abstract 1
- 230000009257 reactivity Effects 0.000 abstract 1
- 238000006467 substitution reaction Methods 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/01—Treating phosphate ores or other raw phosphate materials to obtain phosphorus or phosphorus compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Phosphate rock is heated in two stages under controlled conditions to yield an improved calcined product rendered more suitable for subsequent acidulation by wet-process phosphoric acid. The two-stage thermal treatment of the instant invention is especially beneficial when applied to an apatitic phosphate rock possessing a high content of organic matter and a high degree of carbonate substitution in the apatite crystal lattice. By using heating conditions milder than those proposed by prior-art teachings, the instant process requires less externally supplied energy than such prior art calcination processes and yet yields calcined products of at least, and in most cases, greater than equivalent quality. For phosphate rock from the Pungo River Formation of North Carolina, a first-stage heating temperature in the range of 350° C. to 400° C. was particularly beneficial in providing acceptably low levels of both sulfide and residual organic matter and acceptably high levels of both surface area and reactivity to acid in the final calcined product.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/648,412 UST105602I4 (en) | 1984-09-10 | 1984-09-10 | Thermal treatment of phosphate rock |
| US06/902,721 US4702896A (en) | 1984-09-10 | 1986-09-02 | Thermal treatment of phosphate rock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/648,412 UST105602I4 (en) | 1984-09-10 | 1984-09-10 | Thermal treatment of phosphate rock |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US06/902,721 Continuation-In-Part US4702896A (en) | 1984-09-10 | 1986-09-02 | Thermal treatment of phosphate rock |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| UST105602I4 true UST105602I4 (en) | 1985-07-02 |
Family
ID=24600674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US06/648,412 Pending UST105602I4 (en) | 1984-09-10 | 1984-09-10 | Thermal treatment of phosphate rock |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | UST105602I4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4702896A (en) | 1984-09-10 | 1987-10-27 | Tennessee Valley Authority | Thermal treatment of phosphate rock |
-
1984
- 1984-09-10 US US06/648,412 patent/UST105602I4/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4702896A (en) | 1984-09-10 | 1987-10-27 | Tennessee Valley Authority | Thermal treatment of phosphate rock |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STPP | Information on status: patent application and granting procedure in general |
Free format text: DEFENSIVE PUBLICATION OR SIR FILE |