BE513953A - - Google Patents
Info
- Publication number
- BE513953A BE513953A BE513953DA BE513953A BE 513953 A BE513953 A BE 513953A BE 513953D A BE513953D A BE 513953DA BE 513953 A BE513953 A BE 513953A
- Authority
- BE
- Belgium
- Prior art keywords
- phosphate
- nitric acid
- attacked
- crude
- calcium nitrate
- Prior art date
Links
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N Calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims description 18
- 239000010452 phosphate Substances 0.000 claims description 15
- NBIIXXVUZAFLBC-UHFFFAOYSA-K [O-]P([O-])([O-])=O Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 12
- GRYLNZFGIOXLOG-UHFFFAOYSA-N nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- 229910052731 fluorine Inorganic materials 0.000 claims description 5
- 239000001506 calcium phosphate Substances 0.000 claims description 4
- 239000000470 constituent Substances 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 4
- 239000011737 fluorine Substances 0.000 claims description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- QORWJWZARLRLPR-UHFFFAOYSA-H Tricalcium phosphate Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 239000003337 fertilizer Substances 0.000 claims description 3
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 claims description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 2
- 238000000354 decomposition reaction Methods 0.000 claims description 2
- 238000002386 leaching Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- NEFBYIFKOOEVPA-UHFFFAOYSA-K Dicalcium phosphate Chemical compound [Ca+2].[Ca+2].[O-]P([O-])([O-])=O NEFBYIFKOOEVPA-UHFFFAOYSA-K 0.000 claims 2
- 235000019739 Dicalciumphosphate Nutrition 0.000 claims 2
- 229910000390 dicalcium phosphate Inorganic materials 0.000 claims 2
- 229940038472 dicalcium phosphate Drugs 0.000 claims 2
- 239000000969 carrier Substances 0.000 claims 1
- 239000011363 dried mixture Substances 0.000 claims 1
- 229910000150 monocalcium phosphate Inorganic materials 0.000 claims 1
- 235000019691 monocalcium phosphate Nutrition 0.000 claims 1
- 235000015097 nutrients Nutrition 0.000 claims 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims 1
- 235000011121 sodium hydroxide Nutrition 0.000 claims 1
- 235000021317 phosphate Nutrition 0.000 description 13
- 239000000047 product Substances 0.000 description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-K 2qpq Chemical compound [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 description 5
- FUFJGUQYACFECW-UHFFFAOYSA-L calcium hydrogenphosphate Chemical compound [Ca+2].OP([O-])([O-])=O FUFJGUQYACFECW-UHFFFAOYSA-L 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium monoxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L Calcium fluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000015450 Tilia cordata Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229910001634 calcium fluoride Inorganic materials 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000001131 transforming Effects 0.000 description 2
- PRKQVKDSMLBJBJ-UHFFFAOYSA-N Ammonium carbonate Chemical compound N.N.OC(O)=O PRKQVKDSMLBJBJ-UHFFFAOYSA-N 0.000 description 1
- DVARTQFDIMZBAA-UHFFFAOYSA-O Ammonium nitrate Chemical compound [NH4+].[O-][N+]([O-])=O DVARTQFDIMZBAA-UHFFFAOYSA-O 0.000 description 1
- 241000283690 Bos taurus Species 0.000 description 1
- 229960005069 Calcium Drugs 0.000 description 1
- 229960003563 Calcium Carbonate Drugs 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L Calcium hydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- YYRMJZQKEFZXMX-UHFFFAOYSA-L calcium bis(dihydrogenphosphate) Chemical compound [Ca+2].OP(O)([O-])=O.OP(O)([O-])=O YYRMJZQKEFZXMX-UHFFFAOYSA-L 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 238000010908 decantation Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- -1 gangue Substances 0.000 description 1
- 229910052588 hydroxylapatite Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 230000001376 precipitating Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 235000011008 sodium phosphates Nutrition 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical class [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B11/00—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes
- C05B11/04—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid
- C05B11/06—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid using nitric acid (nitrophosphates)
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Fertilizers (AREA)
Description
<Desc/Clms Page number 1>
PROCEDE DE PREPARATION D'UN ENGRAIS OU FOURRAGE PHOSPHATE STABLE AU STOCKAGE.
Parmi les engrais contenant des phosphates, ceux à base de phos- phate de calcium secondaire CaHPO/ se distinguent par leur bonne solubilité dans le citrate. Ils sont le plus souvent préparés par voie humide par préci- pitation, à l'aide de matières à action alcaline, de phosphates bruts dissous dans des acides. Ces procédés connus s'accompagnent de différentes difficul- tés ; en particulier on doit opére,r en solution fortement diluée afin d'éviter la formation de l'hydroxyapatite insoluble dans le citrate, ce qui entraîne des frais élevés de filtration et d'évaporation, ou bien on doit, avant la précipitation, séparer par refroidissement une partie du nitrate de calcium formé lors de la dissolution, ou bien le rendre inoffensif par addition de quantités correspondantes d'acide phosphorique.
La transformation en phosphate secondaire du phosphate primaire formé par dissolution du phosphate brut dans les acides peut s'obtenir, autre- ment que par l'action d'un agent de précipitation alcalin, également par chauf- fage à des températures modérées inférieures à 250 en faisant distiller l'a- cide nitrique ainsi libéré suivant l'équation :
EMI1.1
La seconde molécule de nitrate de calcium formée suivant l'équa- tion de dissolution :
EMI1.2
peut être rendue inoffensive par décomposition dans du carbonate ammonique avec formation de carbonate de calcium et de nitrate d'ammonium demeurant
<Desc/Clms Page number 2>
dans le produit.
Or, on a trouvé qu'on peut obtenir un engrais à teneur particu- lièrement élevée en phosphate secondaire si on poursuit le procédé de pré- paration qui vient d'être décrit, de manière à séparer par lixiviation en phos- phate de calcium secondaire et nitrate de calcium la masse obtenue par éva- poration et chauffage de la masse de phosphate brut attaquée par l'acide nitri- que, le nitrate de calcium passé en solution étant récupéré comme sous-pro- duit de valeur par évaporation de façon connue en soi.
La teneur en phosphate de calcium secondaire dans le produit final peut encore être augmentée si on sépare du mélange obtenu par l'atta- que du phosphate brut dans l'acide nitrique, par filtration ou centrifugation, les constituants insolubles tels que gangue, phosphates de fer et d'aluminium et produits goudronneux.
Il est même possible d'obtenir une préparation pratiquement exempte de fluor comme fourrage pour le bétail en traitant d'abord par de la chaux la masse de phosphate brut attaquée par l'acide nitrique avant la fil- tration des constituants insolubles et en réglant en même temps son acidité à une valeur telle que le fluor présent se sépare sous forme de fluorure de calcium insoluble, le degré d'acidité devant être mesuré avec soin pour qu' aucune quantité notable de phosphate de calcium ne précipite avec le fluo- rure de calcium. On effectue ensuite la filtration et on poursuit le procédé comme décrit plus haut.
Comme matières premières dans le procédé précité, on peut utili- ser des phosphates bruts d'origines les plus diverses, ainsi que des cendres d'os. Des produits relativement pauvres en phosphore donnent également des produits finals à haute teneur en P2O5 par application du procédé conforme à l'invention. 205 par application proc'd' conforme
Le procédé faisant l'objet de la présente invention s'exécute comme suit :
Le produit attaqué par l'acide nitrique, dont on a évaporé la totalité de l'acide nitrique en excès ainsi que celui résultant de la trans- formation du phosphate de calcium primaire en phosphate de calcium secon- daire par le nitrate de calcium,par chauffage à des températures d'envi- ron 200 , mais en tous cas inférieures à 250 , est lixivié de façon usuelle=, le mieux suivant le principe à contre-courant.
La séparation du phosphate de calcium secondaire insoluble s'effectue par filtration dans des filtres- presses, filtres à entonnoirs, filtres rotatifs ou appareils analogues ou bien par décantation ou centrifugation. Après le lavage ultérieur du préci- pité, on sèche celui-ci avec soin, en évitant autant que possible des tem- pératures supérieures à 100 pour empêcher une réduction de la solubilité dans le citrate. On évapore la solution de nitrate de calcium obtenue et on la transforme de façon connue en soi en nitrate de calcium; elle ne ren- ferme que des traces de phosphate et pas de fluor.
Le procédé est illustré par les exemples suivants, sans cepen- dant être limité aux proportions ni au mode opératoire qui y sont décrits.
EXEMPLE 1. -
On attaque 100 parties de phosphate brut, à 29,4 % de P205 et 47,2 % de CaO au moyen de 203 parties d'acide nitrique à 47%. On évapore la masse d'attaque diluée, et on la sèche en la remuant continuellement pendant 4 heures à 200 . On met le produit sec (150 parties) en suspension dans 150 parties d'eau, on remue pendant 10 minutes et on filtre. Le résidu (85 parties) séché à 100 contient 34,3 % de P205 dont 88 % sont solubles dans le citrate.
EXEMPLE 2. -
On attaque 100 parties de phosphate brut à 29,4 % de P2O5, 47,2 %
<Desc/Clms Page number 3>
de CaO et 3,15 % de F au moyen de 203 parties d'acide nitrique à 47 %. On règle le pH de la masse attaquée à 1,4 par addition lente de lait de chaux.
On filtre le précipité et on le lave au moyen de 50 parties d'eau.
On évapore le filtrat, et on sèche la boue épaisse produite, en remuant constamment pendant 4 heures à 200 . On met le produit sec (112 parties) en suspension dans 180 parties d'eau, on remue pendant 10 minutes et on filtre. Le résidu (52 parties) séché à 100 , ne contient pas de fluor.
La teneur en P2O5 est de 44,8 % dont 89 % sont solubles dans le citrate.
<Desc / Clms Page number 1>
PROCESS FOR PREPARING A PHOSPHATE FERTILIZER OR FODDER STABLE IN STORAGE.
Among the fertilizers containing phosphates, those based on the secondary calcium phosphate CaHPO / are distinguished by their good solubility in citrate. They are most often prepared by the wet process by precipitation, using alkaline-acting materials, of crude phosphates dissolved in acids. These known methods are accompanied by various difficulties; in particular one must operate, r in strongly diluted solution in order to avoid the formation of the insoluble hydroxyapatite in the citrate, which entails high filtration and evaporation costs, or else one must, before precipitation, separate by cooling part of the calcium nitrate formed during dissolution, or else rendering it harmless by adding corresponding amounts of phosphoric acid.
The transformation into secondary phosphate of the primary phosphate formed by dissolving the crude phosphate in acids can be obtained, other than by the action of an alkaline precipitating agent, also by heating at moderate temperatures below 250 by distilling the nitric acid thus liberated according to the equation:
EMI1.1
The second calcium nitrate molecule formed according to the dissolution equation:
EMI1.2
can be rendered harmless by decomposition in ammonium carbonate with the formation of calcium carbonate and ammonium nitrate remaining
<Desc / Clms Page number 2>
in the product.
Now, it has been found that a fertilizer with a particularly high secondary phosphate content can be obtained if the preparation process which has just been described is continued, so as to separate by leaching into secondary calcium phosphate. and calcium nitrate the mass obtained by evaporation and heating of the mass of crude phosphate attacked by nitric acid, the calcium nitrate passed in solution being recovered as a valuable by-product by evaporation in a known manner in itself.
The secondary calcium phosphate content in the final product can be further increased if the insoluble constituents such as gangue, sodium phosphates are separated from the mixture obtained by attacking the crude phosphate in nitric acid, by filtration or centrifugation. iron and aluminum and tarry products.
It is even possible to obtain a practically fluorine-free preparation as fodder for cattle by first treating the mass of crude phosphate attacked by nitric acid with lime before filtering off the insoluble constituents and regulating by lime. at the same time its acidity to such a level that the fluorine present separates out as insoluble calcium fluoride, the degree of acidity having to be carefully measured so that no significant amount of calcium phosphate precipitates with the calcium fluoride. calcium. Filtration is then carried out and the process is continued as described above.
As raw materials in the above process, crude phosphates of the most diverse origins can be used, as well as bone ash. Products relatively low in phosphorus also give end products with a high P2O5 content by application of the process according to the invention. 205 by application proc'd 'compliant
The method forming the subject of the present invention is carried out as follows:
The product attacked by nitric acid, from which all of the excess nitric acid has been evaporated as well as that resulting from the transformation of primary calcium phosphate into secondary calcium phosphate by calcium nitrate, by heating to temperatures of about 200, but in any case below 250, is leached in the usual way =, best according to the countercurrent principle.
The separation of the insoluble secondary calcium phosphate is carried out by filtration in filter presses, funnel filters, rotary filters or the like, or by decantation or centrifugation. After the subsequent washing of the precipitate, it is carefully dried, avoiding temperatures above 100 as much as possible to prevent a reduction in the solubility in citrate. The solution of calcium nitrate obtained is evaporated and it is converted in a manner known per se into calcium nitrate; it only contains traces of phosphate and no fluorine.
The process is illustrated by the following examples, without however being limited to the proportions or the procedure described therein.
EXAMPLE 1. -
100 parts of crude phosphate, 29.4% P205 and 47.2% CaO, are attacked by means of 203 parts of 47% nitric acid. The dilute etchant is evaporated, and dried by stirring continuously for 4 hours at 200. The dry product (150 parts) is suspended in 150 parts of water, stirred for 10 minutes and filtered. The residue (85 parts) dried to 100 contains 34.3% P205 of which 88% is soluble in citrate.
EXAMPLE 2. -
100 parts of crude phosphate are attacked at 29.4% P2O5, 47.2%
<Desc / Clms Page number 3>
CaO and 3.15% F using 203 parts of 47% nitric acid. The pH of the attacked mass is adjusted to 1.4 by the slow addition of milk of lime.
The precipitate is filtered off and washed with 50 parts of water.
The filtrate is evaporated, and the thick slurry produced is dried, stirring constantly for 4 hours at 200. The dry product (112 parts) is suspended in 180 parts of water, stirred for 10 minutes and filtered. The residue (52 parts) dried to 100, does not contain fluorine.
The P2O5 content is 44.8% of which 89% are soluble in citrate.
Claims (1)
Publications (1)
Publication Number | Publication Date |
---|---|
BE513953A true BE513953A (en) |
Family
ID=151913
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE513953D BE513953A (en) |
Country Status (1)
Country | Link |
---|---|
BE (1) | BE513953A (en) |
-
0
- BE BE513953D patent/BE513953A/fr unknown
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3554729A (en) | Manufacture of low chloride potassium phosphate fertilizer | |
BE513953A (en) | ||
US1816285A (en) | Process of converting phosphate rock into soluble compounds and of separating its content of lime and phosphoric acid | |
FR2548166A1 (en) | PROCESS FOR REMOVING IMPURITIES FROM PHOSPHORIC ACID OBTAINED BY WETWAY | |
US4248843A (en) | Treatment of phosphoric acid | |
FR2771601A1 (en) | High solubility mono:calcium phosphate mono:hydrate, used in animal feed | |
FR2621031A1 (en) | PROCESS FOR THE PREPARATION OF MONOCALCIUM PHOSPHATE | |
US1834454A (en) | Manufacture of fertilizers | |
EP3331841B1 (en) | Method for manufacturing an ammonium phosphate fertilizer having low cadmium content | |
US4127400A (en) | Process of manufacturing non-gelling suspension liquid fertilizers | |
EP0237775A2 (en) | Stable ammonium Polyphosphate liquid fertilizer from merchant grade phosphoric acid | |
WO2001074740A2 (en) | Improved solubility fertilizer compounds and compositions | |
JPS605008A (en) | Method of separating magnesium from concentrated phosphoric acid through wet type method | |
SU1542896A1 (en) | Method of producing monoammonium phosphate | |
JPH0261409B2 (en) | ||
SU1520059A1 (en) | Method of producing feed diammonium phosphate | |
RU2162071C2 (en) | Method of preparing complex fertilizers | |
BE521632A (en) | ||
RU1792932C (en) | Method of modification of ammonium nitrate with magnesium nitrate solution | |
RU2266273C1 (en) | Method for production of complex water soluble nitrous/phosphorous fertilizer | |
SU1020416A1 (en) | Process for producing complex fertilizer | |
CN115073315A (en) | Synthetic method of sodium aspartate and calcium aspartate | |
JPS6236093A (en) | Manufacture of liquid fertilizer | |
SU1213010A1 (en) | Method of producing dicalciumphosphate | |
US1423799A (en) | Ketiiob op makihg dicyahdiamide |