EA201201262A1 - Method of producing phosphoric acid phosphorus - Google Patents
Method of producing phosphoric acid phosphorusInfo
- Publication number
- EA201201262A1 EA201201262A1 EA201201262A EA201201262A EA201201262A1 EA 201201262 A1 EA201201262 A1 EA 201201262A1 EA 201201262 A EA201201262 A EA 201201262A EA 201201262 A EA201201262 A EA 201201262A EA 201201262 A1 EA201201262 A1 EA 201201262A1
- Authority
- EA
- Eurasian Patent Office
- Prior art keywords
- pulp
- decomposition
- hemihydrate
- acid
- phosphoric acid
- Prior art date
Links
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Изобретение относится к способам получения экстракционной фосфорной кислоты (ЭФК) посредством серно-кислотного разложения фосфатного сырья, конкретно - фосфоритов Каратау. Способ включает разложение фосфатного сырья с соотношением PO:MgO=14-53 фосфорной и серной кислотами при соотношении содержаний в жидкой фазе пульпы PO:SO=10-25 и кратности циркуляции пульпы в зоне разложения 10-85 с кристаллизацией дигидрата сульфата кальция, охлаждение 30-100% циркулируемой пульпы воздухом в режиме пенного слоя при градиенте температур между охлажденной и подаваемой на охлаждение пульпой 0,5-4,0°С, отделение продукционной кислоты от осадка сульфата кальция фильтрацией. По этому способу полученные на стадии фильтрации осадок дигидрата сульфата кальция и фосфорную кислоту после отделения продукционной кислоты смешивают с серной кислотой концентрацией 92-98% HSOв количестве 25-40% от общего объема серной кислоты, подаваемой на разложение фосфатного сырья, проводят перекристаллизацию дигидрата сульфата кальция в полугидрат при температуре 85-95°С и соотношении в жидкой фазе пульпы РО:SO=(2,3-4,6)/1 в течение 0,5-2,0 ч, полученную полугидратную пульпу разделяют методом фильтрации с водной промывкой осадка α-полугидрата сульфата кальция в режиме противотока и возвратом оборотной фосфорной кислоты на стадию разложения фосфатного сырья, а отмытый осадок α-полугидрата сульфата кальция подвергают сушке, доизмельчению и используют в качестве гипсового вяжущего.The invention relates to methods for producing phosphoric acid (EPA) through sulfuric acid decomposition of phosphate raw materials, specifically Karatau phosphate. The method includes the decomposition of phosphate raw materials with the ratio of PO: MgO = 14-53 of phosphoric and sulfuric acids with the ratio of the contents in the liquid phase of the pulp PO: SO = 10-25 and the multiplicity of circulation of the pulp in the decomposition zone 10-85 with the crystallization of calcium sulfate dihydrate, cooling 30 -100% of circulating pulp with air in the foam layer mode with a temperature gradient between cooled and supplied pulp of 0.5-4.0 ° C, separation of production acid from calcium sulphate by filtration. According to this method, the calcium sulphate dihydrate precipitate obtained at the filtration stage and phosphoric acid after separation of the production acid is mixed with sulfuric acid with a concentration of 92-98% HSO in the amount of 25-40% of the total volume of sulfuric acid fed to the decomposition of the phosphate raw material, calcium sulfate dihydrate in hemihydrate at a temperature of 85-95 ° C and the ratio in the liquid phase of the pulp PO: SO = (2.3-4.6) / 1 for 0.5-2.0 h, the hemihydrate pulp obtained is separated by filtration with water washing sludge α-hemihydrate with calcium lfata in counterflow mode and return back to step phosphoric acid decomposition of phosphate raw materials and the washed precipitate α-hemihydrate calcium sulfate is dried, regrinding and used as the gypsum binder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EA201201262A EA020908B1 (en) | 2012-10-05 | 2012-10-05 | Method of obtaining extraction phosphoric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EA201201262A EA020908B1 (en) | 2012-10-05 | 2012-10-05 | Method of obtaining extraction phosphoric acid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EA201201262A1 true EA201201262A1 (en) | 2014-04-30 |
| EA020908B1 EA020908B1 (en) | 2015-02-27 |
Family
ID=50516427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EA201201262A EA020908B1 (en) | 2012-10-05 | 2012-10-05 | Method of obtaining extraction phosphoric acid |
Country Status (1)
| Country | Link |
|---|---|
| EA (1) | EA020908B1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1474082A1 (en) * | 1986-11-17 | 1989-04-23 | Ленинградский Технологический Институт Им.Ленсовета | Method of producing phosphoric acid |
| CN1340457A (en) * | 2000-09-01 | 2002-03-20 | 山东鲁北企业集团总公司 | Process for preparing phosphoric acid |
| RU2373143C1 (en) * | 2008-08-27 | 2009-11-20 | Закрытое акционерное общество "Научно-производственная компания "Интерфос" | Method of producing phosphoric acid |
| EA015047B1 (en) * | 2009-03-06 | 2011-04-29 | Открытое Акционерное Общество "Научно-Исследовательский Институт По Удобрениям И Инсектофунгицидам Им. Профессора Я.В. Самойлова" | Method for producing extraction phosphoric acid |
-
2012
- 2012-10-05 EA EA201201262A patent/EA020908B1/en active IP Right Revival
Also Published As
| Publication number | Publication date |
|---|---|
| EA020908B1 (en) | 2015-02-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM4A | Lapse of a eurasian patent due to non-payment of renewal fees within the time limit in the following designated state(s) |
Designated state(s): AM AZ BY KZ KG TJ TM RU |
|
| NF4A | Restoration of lapsed right to a eurasian patent |
Designated state(s): RU |
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| TC4A | Change in name of a patent proprietor in a eurasian patent | ||
| NF4A | Restoration of lapsed right to a eurasian patent |
Designated state(s): KZ |