CN103723697A - Method for improving quality of acid for diammonium phosphate - Google Patents
Method for improving quality of acid for diammonium phosphate Download PDFInfo
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- CN103723697A CN103723697A CN201310742842.XA CN201310742842A CN103723697A CN 103723697 A CN103723697 A CN 103723697A CN 201310742842 A CN201310742842 A CN 201310742842A CN 103723697 A CN103723697 A CN 103723697A
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- Prior art keywords
- phosphoric acid
- strong phosphoric
- strong
- diammonium phosphate
- ozone
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Abstract
The invention relates to a method for improving quality of acid for diammonium phosphate. Ozone is continuously aerated into strong phosphoric acid solution in a strong phosphoric acid storing tank so as to oxidize Fe<2+> in the strong phosphoric acid into Fe<3+>, and the ozone is stopped aerating till the mass percent concentration of Fe<2+> in the strong phosphoric acid solution is less than 0.4%. By aerating the ozone with strong oxidizing property into the strong phosphoric acid to oxidize Fe<2+> into Fe<3+>, the content of Fe<2+> in phosphoric acid can be sharply lowered, ferrous ammonium phosphate complex is avoided in subsequent processes, therefore, the appearance quality of monoammonium phosphate product is improved, furthermore, the treatment method is very simple and the treatment cost is low.
Description
Technical field
The present invention relates to the method that diammonium phosphate is improved by sour matter.
Background technology
In features of DAP production, the quality that participates in the raw material phosphoric acid quality of reaction is related to the quality of the finished product diammonium phosphate quality.In two water laws of applicant unit, produce in phosphoric acid, need to digest the Waste Sulfuric Acid producing in titanium white production, in this Waste Sulfuric Acid, contain a large amount of Fe
2+, its mass percentage content can be up to 6%.These Fe
2+with the Fe in Rock Phosphate (72Min BPL)
2+the overwhelming majority will exist and filter in the strong phosphoric acid of producing, concentrated along with phosphoric acid, Fe in features of DAP production strong phosphoric acid used
2+concentration will further raise.Fe
2+meeting and NH in phosphorus ammonium is produced
4 +and the impurity in phosphoric acid carries out complicated chelatropic reaction, generate ferrous phosphate ammonium complex compound, this material will affect phosphorus ammonium two ammonium product appearance quality greatly, cause its particle crystallization feel variation, and smooth finish is dimmed; Its intensity also dies down simultaneously, can not meet the needs of its packing and transportation.
Summary of the invention
Object of the present invention provides a kind of method of sour matter for diammonium phosphate of improving, and can effectively remove Fe in strong phosphoric acid
2+disadvantageous effect to finished product diammonium phosphate, improves phosphorus ammonium two ammonium product appearance quality.
The present invention is achieved in that ozone gas is passed in the concentrated phosphoric acid in strong phosphoric acid storage tank continuously, by the Fe in strong phosphoric acid
2+be oxidized to Fe
3+, until Fe in concentrated phosphoric acid
2+mass percent concentration is lower than 0.4%.
Its reaction principle is as follows:
3O
2=2O
3
O
3+6Fe
2++6H
+=6Fe
3++3H
2O
From above-mentioned reaction formula, the Fe in strong phosphoric acid
2+by ozone oxidation, be Fe
3+, can avoid and NH
4 +and the impurity in phosphoric acid carries out complicated chelatropic reaction and generate ferrous phosphate ammonium complex compound, thereby can improve phosphorus ammonium two ammonium product appearance quality.
For making Fe
2+fully contact with ozone, described ozone gas passes into strong phosphoric acid storage tank bottom, by stirring rake, the strong phosphoric acid in storage tank is stirred, to accelerate oxidizing reaction process simultaneously.
Concentration >=99% of described ozone gas, the ozone gas of this concentration can be made by high concentration ozone generator, adopts concentration high ozone gas to be conducive to fully carrying out of oxidizing reaction.
The volume ratio of the strong phosphoric acid inlet in the unit time in ozone gas intake and strong phosphoric acid storage tank is 3～4:30.
As shown from the above technical solution, the present invention, by strong oxidizing property ozone gas is passed in strong phosphoric acid, makes Fe
2+by ozone oxidation, be Fe
3+, can significantly reduce Fe in acid
2+content, to avoid occurring ferrous phosphate ammonium complex compound in subsequent handling, thereby improve phosphorus ammonium two ammonium product appearance quality, there is particle smooth finish good, intensity is high, is conducive to its packing and transportation; Treatment process is extremely simple simultaneously, and processing cost is low.
Embodiment
The features of DAP production line of producing 200000 tons of nutrients 61% per year of take is example, and production per hour concentrated acid amount used is about 30m
3, i.e. the about 30m of strong phosphoric acid amount of relieving haperacidity production line inflow strong phosphoric acid per hour storage tank
3.
By the ozone gas of ozone concn>=99% being made by high concentration ozone generator with 3～4m
3the speed of/h is passed in the concentrated phosphoric acid of strong phosphoric acid storage tank bottom continuously, the strong phosphoric acid in strong phosphoric acid storage tank is stirred simultaneously, and ozone is by the Fe in strong phosphoric acid
2+be oxidized to Fe
3+.Storage tank exports phosphoric acid, Fe in strong phosphoric acid after testing
2+mass percent concentration is lower than 0.4%.
Claims (4)
1. improve the method for sour matter for diammonium phosphate, it is characterized in that: ozone gas is passed in the concentrated phosphoric acid in strong phosphoric acid storage tank continuously, by the Fe in strong phosphoric acid
2+be oxidized to Fe
3+, until Fe in concentrated phosphoric acid
2+mass percent concentration is lower than 0.4%.
2. according to claim 1ly improve the method for sour matter for diammonium phosphate, it is characterized in that: described ozone gas passes into strong phosphoric acid storage tank bottom, the strong phosphoric acid in storage tank is stirred simultaneously.
3. according to claim 1ly improve the method for sour matter for diammonium phosphate, it is characterized in that: concentration >=99% of described ozone gas.
4. according to claim 3ly improve the method for sour matter for diammonium phosphate, it is characterized in that: the volume ratio of the strong phosphoric acid inlet in the unit time in ozone gas intake and strong phosphoric acid storage tank is 3～4:30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310742842.XA CN103723697B (en) | 2013-12-27 | 2013-12-27 | Improve the method for quality of acid for diammonium phosphate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310742842.XA CN103723697B (en) | 2013-12-27 | 2013-12-27 | Improve the method for quality of acid for diammonium phosphate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103723697A true CN103723697A (en) | 2014-04-16 |
| CN103723697B CN103723697B (en) | 2016-03-09 |
Family
ID=50448046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310742842.XA Active CN103723697B (en) | 2013-12-27 | 2013-12-27 | Improve the method for quality of acid for diammonium phosphate |
Country Status (1)
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| CN (1) | CN103723697B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101293640A (en) * | 2008-06-18 | 2008-10-29 | 湘潭大学 | Method for preparing ammonium phosphate salt with hydrochloric acid leaching deficient phosphorus ore |
| CN101531355A (en) * | 2009-04-22 | 2009-09-16 | 广西大学 | Method for preparing high purity ferric phosphate using ferrous sulfate as by-product of white titanium pigment |
| CN101618905A (en) * | 2008-07-04 | 2010-01-06 | 浙江工业大学 | Method for treating phosphoric wastewater through ozone-enhanced electrocoagulation |
| CN102191387A (en) * | 2010-03-08 | 2011-09-21 | 陈树忠 | Method for purifying titanium solution |
| CN102888511A (en) * | 2012-10-12 | 2013-01-23 | 中南大学 | Iron removal method of hydrometallurgical acidic leaching solution |
-
2013
- 2013-12-27 CN CN201310742842.XA patent/CN103723697B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101293640A (en) * | 2008-06-18 | 2008-10-29 | 湘潭大学 | Method for preparing ammonium phosphate salt with hydrochloric acid leaching deficient phosphorus ore |
| CN101618905A (en) * | 2008-07-04 | 2010-01-06 | 浙江工业大学 | Method for treating phosphoric wastewater through ozone-enhanced electrocoagulation |
| CN101531355A (en) * | 2009-04-22 | 2009-09-16 | 广西大学 | Method for preparing high purity ferric phosphate using ferrous sulfate as by-product of white titanium pigment |
| CN102191387A (en) * | 2010-03-08 | 2011-09-21 | 陈树忠 | Method for purifying titanium solution |
| CN102888511A (en) * | 2012-10-12 | 2013-01-23 | 中南大学 | Iron removal method of hydrometallurgical acidic leaching solution |
Non-Patent Citations (3)
| Title |
|---|
| 何世杰: "影响磷酸二铵产品颜色的因素分析", 《磷肥与复肥》, vol. 19, no. 2, 31 March 2004 (2004-03-31), pages 39 - 43 * |
| 叶树滋: "利用钛白废酸制高纯度磷酸一铵试验简介", 《硫酸设计与粉体工程》, no. 5, 30 September 2007 (2007-09-30), pages 34 - 37 * |
| 沈浩: "磷酸质量对磷酸二铵生产的影响", 《磷肥与复肥》, vol. 21, no. 6, 30 November 2006 (2006-11-30), pages 24 - 26 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103723697B (en) | 2016-03-09 |
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