CN1151059C - Purifying process of phosphoric acid produced via wet process - Google Patents
Purifying process of phosphoric acid produced via wet process Download PDFInfo
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- CN1151059C CN1151059C CNB021338698A CN02133869A CN1151059C CN 1151059 C CN1151059 C CN 1151059C CN B021338698 A CNB021338698 A CN B021338698A CN 02133869 A CN02133869 A CN 02133869A CN 1151059 C CN1151059 C CN 1151059C
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- phosphoric acid
- wet
- acid
- groove
- wet method
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Abstract
The present invention discloses a wet purifying and processing method of phosphoric acid, which enables impurity ions in wet strong phosphoric acid to be completely separated by adopting heat exchange, cooling, aging and crystallisation, and the crystal size of the separated sedimentation salt is increased, which is favorable for clarification and separation. The clarification bottom flow realizes liquid-solid separation by adopting a sedimentation type centrifuge; the wet phosphoric acid product contains at least 52.0% of P2O5, at most 2.5% of Fe2O3 and Al2O3, at most 1.0% of SS and at most 1.0% of MgO, and the stabilization comes up to the general international standard. The liquid-solid separation is thorough, and the yield of the acid product is increased by more than 30%.
Description
Technical field
The present invention relates to the production method of wet method commodity phosphoric acid, more particularly, the present invention relates to a kind of method of the wet method strong phosphoric acid being made further purifying treatment.
Background technology
After the phosphoric acid by wet process process concentrates, the P that can reach
2O
5Concentration is still also low, and solid content height, foreign matter content height do not reach the specification of quality of international wet method commodity phosphoric acid, need further purifying treatment, could make wet method commodity phosphoric acid and sell.In the prior art, normally adopt multistage (generally greater than three grades) natural clarifying, as shown in Figure 1, this method quality product difficulty reaches general international standard, and liquid-solid separation is not thorough, and the product acid yield is low, and production method falls behind.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, provide a kind of wet phosphoric acid purifying to handle the method for production wet method commodity phosphoric acid.Utilize this law can improve the yield of product acid significantly, and improve the quality product of wet method commodity phosphoric acid.
The present invention is achieved by following technical proposals:
1. the wet method strong phosphoric acid is introduced an interchanger, strong phosphoric acid is lowered the temperature with recirculated cooling water; Being beneficial to impurity supersaturation crystallization separates out;
2. the hot water of interchanger is introduced the use of water cooling tower refrigeration cycle; Strong phosphoric acid after the cooling is introduced the aging crystallization groove, and separates out impurity crystalline granularity by the increase of aging crystallization groove, introduces clarifying tank again;
3. the overflow of clarifying tank is introduced in the wet method commodity phosphoric acid groove; The underflow sludge of clarifying tank is introduced settling centrifuge;
4. wet method commodity phosphoric acid groove is introduced in the overflow of settling centrifuge; Slag acid is discharged from the bottom, is used to produce fertilizer.
Description of drawings
Fig. 1 is the multistage natural clarifying process flow sheet of prior art;
Fig. 2 is a process flow sheet of the present invention.
Embodiment
Embodiment 1
Purification treatment method of wet-process phosphoric acid of the present invention is through the 150Kt P of Yunnan Prov Sanhuan Chemical Co., Ltd
2O
5The large-scale wet-process phosphoric acid production plant test of/a.Test extremely successfully, obtained following outstanding technique effect: owing to adopt heat exchange cooling, aging crystallization, it is more complete to make foreign ion in the wet method strong phosphoric acid separate out, and has increased the grain size number of the deposited salt of separating out, and helps the clarification separation.The clarification underflow adopts settling centrifuge to realize liquid-solid separation, and the quality of phosphoric acid by wet process product is P
2O
5〉=52.0%, Fe
2O
3+ Al2O3≤2.5%, SS≤1.0%, MgO≤1.0%, the stable general international standard that reaches.And liquid-solid separation is thorough, and the sour yield that improves product is more than 30%.
Claims (1)
1. purification treatment method of wet-process phosphoric acid, this method comprises the following steps:
(1) the wet method strong phosphoric acid is introduced an interchanger, strong phosphoric acid is lowered the temperature with recirculated cooling water;
(2) hot water of interchanger is introduced the use of water cooling tower refrigeration cycle; Strong phosphoric acid after the cooling is introduced the aging crystallization groove, and by separating out impurity crystalline granularity in the aging crystallization groove increase strong phosphoric acid, introduces clarifying tank again;
(3) overflow of clarifying tank is introduced wet method commodity phosphoric acid groove and is made product acid; The underflow sludge of clarifying tank is introduced settling centrifuge;
(4) overflow of settling centrifuge is introduced wet method commodity phosphoric acid groove and is made product acid; Slag acid is discharged from the bottom, is used to produce fertilizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021338698A CN1151059C (en) | 2002-09-28 | 2002-09-28 | Purifying process of phosphoric acid produced via wet process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021338698A CN1151059C (en) | 2002-09-28 | 2002-09-28 | Purifying process of phosphoric acid produced via wet process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1403367A CN1403367A (en) | 2003-03-19 |
| CN1151059C true CN1151059C (en) | 2004-05-26 |
Family
ID=4747434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021338698A Expired - Fee Related CN1151059C (en) | 2002-09-28 | 2002-09-28 | Purifying process of phosphoric acid produced via wet process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1151059C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH701939B1 (en) * | 2007-09-06 | 2011-04-15 | Sulzer Chemtech Ag | Method and apparatus for the purification of aqueous phosphoric acid. |
| CN101759167B (en) * | 2010-01-25 | 2011-11-30 | 云南省化工研究院 | Method for preparing highly-pure phosphoric acid by flow chromatographic crystallization method |
| CN103482595A (en) * | 2013-09-30 | 2014-01-01 | 瓮福（集团）有限责任公司 | Production method for reducing temperature and solid content of diluted phosphoric acid |
| CN106800283B (en) * | 2015-11-26 | 2019-12-31 | 贵州川恒化工股份有限公司 | Production method of powdery fire-fighting grade monoammonium phosphate |
-
2002
- 2002-09-28 CN CNB021338698A patent/CN1151059C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1403367A (en) | 2003-03-19 |
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| PB01 | Publication | ||
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: YUNNAN PROV YUNTIANHUA INTERNATIONAL CHEMICAL CO., Free format text: FORMER NAME: YUNNAN PROV SANHUAN CHEMICAL CO., LTD. |
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| CP03 | Change of name, title or address |
Address after: No. 1417, Dianchi Road, Xishan District, Yunnan, Kunming Province, China: 650028 Patentee after: Yunnan Yuntianhua International Chemical Co.,Ltd. Address before: Haikou Yunnan Kunming Sanhuan Chemical Co., Ltd., Xishan District, Yunnan Province, China: 650113 Patentee before: Yunnan Sanhuan chemical Limited by Share Ltd. Address after: Haikou Yunnan Kunming Sanhuan Chemical Co., Ltd., Xishan District, Yunnan Province, China: 650113 Patentee after: Yunnan Sanhuan chemical Limited by Share Ltd. Address before: Haikou Yunnan Kunming Sanhuan Chemical Co., Ltd., Xishan District, Yunnan Province, China: 650113 Patentee before: YUNNAN SANHUAN CHEMICAL Co.,Ltd. |
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| C56 | Change in the name or address of the patentee |
Owner name: YUNNAN YTH INTERNATIONAL CHEMICAL CO., LTD. Free format text: FORMER NAME: YUNTIANHUA INTERNATIONAL CHEMICAL INDUSTRY CO., LTD., YUNNAN |
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| CP01 | Change in the name or title of a patent holder |
Address after: 650028 No. 1417, Dianchi Road, Xishan District, Yunnan, Kunming Patentee after: YUNNAN YUNTIANHUA INTERNATIONAL CHEMICAL CO.,LTD. Address before: 650028 No. 1417, Dianchi Road, Xishan District, Yunnan, Kunming Patentee before: Yunnan Yuntianhua International Chemical Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040526 Termination date: 20170928 |
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| CF01 | Termination of patent right due to non-payment of annual fee |