UST105701I4 - Method to improved acidulation quality of North Carolina phosphate rock - Google Patents
Method to improved acidulation quality of North Carolina phosphate rock Download PDFInfo
- Publication number
- UST105701I4 UST105701I4 US06/649,034 US64903484A UST105701I4 US T105701 I4 UST105701 I4 US T105701I4 US 64903484 A US64903484 A US 64903484A US T105701 I4 UST105701 I4 US T105701I4
- Authority
- US
- United States
- Prior art keywords
- rock
- north carolina
- acidulation
- improved
- calcine
- 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
- 238000000034 method Methods 0.000 title abstract 3
- 239000002367 phosphate rock Substances 0.000 title abstract 3
- 239000011435 rock Substances 0.000 abstract 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 abstract 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 abstract 2
- 239000012535 impurity Substances 0.000 abstract 2
- 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
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 1
- 238000002386 leaching Methods 0.000 abstract 1
- 239000011707 mineral 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
- 239000007787 solid Substances 0.000 abstract 1
- 238000006467 substitution reaction Methods 0.000 abstract 1
- 150000003568 thioethers Chemical class 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
Phosphate rock is heated under controlled conditions to essentially eliminate organic impurities and sulfides from the rock when subsequently leached with water to thereby substantially increase the porosity and surface area of the calcined solid and remove any traces of sulfide still remaining in the calcine. This process yields an improved calcined product rendered more suitable for acidulation to wet-process phosphoric acid and is of benefit for unweathered apatitic phosphate rocks of the mineral class known as francolites posessing a moderate to high content of organic impurities and a high degree of carbonate substitution in the apatite crystal lattice, such as that rock originating from the Pungo River Formation of North Carolina. For North Carolina rock, inclusion of the leaching step after calcination at about 800° C. may beneficially provide up to a twentyfold increase in calcine surface area to a level of at least 2 m2 /g and a sulfide content decreased to less than about 0.01 percent by weight.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/649,034 UST105701I4 (en) | 1984-09-10 | 1984-09-10 | Method to improved acidulation quality of North Carolina phosphate rock |
| US06/681,157 US4557909A (en) | 1984-09-10 | 1984-12-13 | Method to improve acidulation quality of North Carolina phosphate rock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/649,034 UST105701I4 (en) | 1984-09-10 | 1984-09-10 | Method to improved acidulation quality of North Carolina phosphate rock |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US06/681,157 Continuation US4557909A (en) | 1984-09-10 | 1984-12-13 | Method to improve acidulation quality of North Carolina phosphate rock |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| UST105701I4 true UST105701I4 (en) | 1985-08-06 |
Family
ID=24603209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US06/649,034 Pending UST105701I4 (en) | 1984-09-10 | 1984-09-10 | Method to improved acidulation quality of North Carolina phosphate rock |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | UST105701I4 (en) |
-
1984
- 1984-09-10 US US06/649,034 patent/UST105701I4/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STCF | Information on status: patent grant |
Free format text: PATENTED CASE |