UST971006I4 - Purification of phosphoric acid solutions - Google Patents
Purification of phosphoric acid solutions Download PDFInfo
- Publication number
- UST971006I4 UST971006I4 US05/833,191 US83319177A UST971006I4 US T971006 I4 UST971006 I4 US T971006I4 US 83319177 A US83319177 A US 83319177A US T971006 I4 UST971006 I4 US T971006I4
- Authority
- US
- United States
- Prior art keywords
- acid
- solvent
- increased
- gypsum
- solids
- 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
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 title abstract 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 title abstract 2
- 238000000746 purification Methods 0.000 title 1
- 239000002253 acid Substances 0.000 abstract 4
- 239000007787 solid Substances 0.000 abstract 4
- 229910052602 gypsum Inorganic materials 0.000 abstract 3
- 239000010440 gypsum Substances 0.000 abstract 3
- 238000000034 method Methods 0.000 abstract 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 239000003864 humus Substances 0.000 abstract 2
- 238000004062 sedimentation Methods 0.000 abstract 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 abstract 1
- 229910052770 Uranium Inorganic materials 0.000 abstract 1
- 239000012141 concentrate Substances 0.000 abstract 1
- 238000011109 contamination Methods 0.000 abstract 1
- 238000007796 conventional method Methods 0.000 abstract 1
- 239000013078 crystal Substances 0.000 abstract 1
- 230000007423 decrease Effects 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000003337 fertilizer Substances 0.000 abstract 1
- 229910052731 fluorine Inorganic materials 0.000 abstract 1
- 239000011737 fluorine Substances 0.000 abstract 1
- 239000012535 impurity Substances 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000003960 organic solvent Substances 0.000 abstract 1
- 238000000247 postprecipitation Methods 0.000 abstract 1
- 238000011084 recovery Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 239000002904 solvent Substances 0.000 abstract 1
- 238000000638 solvent extraction Methods 0.000 abstract 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 abstract 1
Images
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
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/234—Purification; Stabilisation; Concentration
- C01B25/235—Clarification; Stabilisation to prevent post-precipitation of dissolved impurities
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
- Fertilizers (AREA)
Abstract
an improved method of purifying wet-process phosphoric acid by sedimentation, in which the crude acid is intimately mixed with an appropriate amount of finely divided silica or silicate. The result is that the absolute magnitude of the zeta potential of the suspended solids, particularly humus and gypsum, decreases to a value that allows them to aggregate, settle rapidly, and be removed by conventional methods. The Si:F ratio is increased, effecting a reduction of fluorine contamination. The rate of growth of gypsum crystals is increased, reducing the amount of post-precipitation of gypsum and other particulates. Because the rate of settlement is increased, the holding time prior to further processing, such as concentrating to merchant-grade acid, is decreased, reducing storage and space requirements and associated capital investment as well as investment in product inventory. The sedimentation of solids concentrates and purifies the acid, allowing production of liquid and solid fertilizers containing fewer impurities. The removal of solids, particularly humus, allows the efficient separation and recovery of organic solvent when uranium is recovered from the impure acid by solvent-solvent extraction methods, minimizing the loss of solvent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/833,191 UST971006I4 (en) | 1977-09-14 | 1977-09-14 | Purification of phosphoric acid solutions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/833,191 UST971006I4 (en) | 1977-09-14 | 1977-09-14 | Purification of phosphoric acid solutions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| UST971006I4 true UST971006I4 (en) | 1978-06-06 |
Family
ID=25263709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US05/833,191 Pending UST971006I4 (en) | 1977-09-14 | 1977-09-14 | Purification of phosphoric acid solutions |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | UST971006I4 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0016531A2 (en) * | 1979-03-19 | 1980-10-01 | INTERNATIONAL MINERALS & CHEMICAL CORPORATION | Purification of phosphoric acid |
| EP0016264A1 (en) * | 1978-12-19 | 1980-10-01 | METALLURGIE HOBOKEN-OVERPELT Société anonyme dite: | Process for extracting uranium from phosphoric acid |
| US4341638A (en) * | 1979-10-17 | 1982-07-27 | International Minerals & Chemical Corp. | Purification of phosphoric acid |
| US4369169A (en) | 1979-01-24 | 1983-01-18 | Rhone-Poulenc Industries | Pretreatment of crude wet process phosphoric acid |
-
1977
- 1977-09-14 US US05/833,191 patent/UST971006I4/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0016264A1 (en) * | 1978-12-19 | 1980-10-01 | METALLURGIE HOBOKEN-OVERPELT Société anonyme dite: | Process for extracting uranium from phosphoric acid |
| US4369169A (en) | 1979-01-24 | 1983-01-18 | Rhone-Poulenc Industries | Pretreatment of crude wet process phosphoric acid |
| EP0016531A2 (en) * | 1979-03-19 | 1980-10-01 | INTERNATIONAL MINERALS & CHEMICAL CORPORATION | Purification of phosphoric acid |
| EP0016531A3 (en) * | 1979-03-19 | 1980-12-10 | INTERNATIONAL MINERALS & CHEMICAL CORPORATION | Purification of phosphoric acid |
| US4341638A (en) * | 1979-10-17 | 1982-07-27 | International Minerals & Chemical Corp. | Purification of phosphoric acid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3556739A (en) | Cleaning phosphoric acid including recovery from the organic solvent by heating to stratify into an acid layer and an organic layer | |
| JPS62171906A (en) | Removal of impurities from wet process phosphoric acid | |
| CN104140082A (en) | Method for recycling titanium dioxide waste acid | |
| US3528771A (en) | Phosphoric acid clarification | |
| US4048289A (en) | Stabilization of wet-process phosphoric acid | |
| US4207294A (en) | Process for recovering uranium from wet-process phosphoric acid | |
| UST971006I4 (en) | Purification of phosphoric acid solutions | |
| US4302427A (en) | Recovery of uranium from wet-process phosphoric acid | |
| US4233278A (en) | Process for purifying crude phosphoric acid | |
| US4222990A (en) | Production of fluoride-free phosphates | |
| US3953581A (en) | Purification of wet-processed phosphoric acid using anhydrous solvents | |
| CA1139954A (en) | Purification of wet process phosphoric acid as a pretreatment step in the recovery of uranium | |
| Sanghani | Novel technique for purification of fertilizer phosphoric acid with simultaneous uranium extraction | |
| US3112991A (en) | Process for recovery of fluoride-free columbium and tantalum pentoxides from organic extracts | |
| US3366448A (en) | Method for treatment of impure phosphoric acid solutions to produce purified phosphoric acid | |
| CN107827114B (en) | Method for recovering phosphorus in wet-process phosphoric acid concentrated slag acid and co-producing dihydrate gypsum and sodium fluosilicate | |
| US4393032A (en) | Production of phosphoric acid and additional products from phosphate ore | |
| US3099622A (en) | Production of clarified acidic phosphatic solutions | |
| US4086322A (en) | Production of fluoride-free phosphates | |
| US3867511A (en) | Solvent extraction of h{hd 3{b po{hd 4 | |
| JO1382B1 (en) | production of phosphoric acid | |
| IT1235509B (en) | Wet process phosphoric acid prodn. with reduced tendency to pptn. | |
| US4065547A (en) | Method of defluorinating phosphoric acid | |
| US3956465A (en) | Solvent purification of wet process phosphoric acid | |
| US5236679A (en) | Removal of aluminum contamination during production of phosphoric acid |