CN101734954A - Method for producing granular monoammonium phosphate with diammonium phosphate device - Google Patents
Method for producing granular monoammonium phosphate with diammonium phosphate device Download PDFInfo
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- CN101734954A CN101734954A CN200910263800A CN200910263800A CN101734954A CN 101734954 A CN101734954 A CN 101734954A CN 200910263800 A CN200910263800 A CN 200910263800A CN 200910263800 A CN200910263800 A CN 200910263800A CN 101734954 A CN101734954 A CN 101734954A
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- neutralization
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- tubular reactor
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- preneutralization
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Abstract
The invention discloses a method for producing a granular monoammonium phosphate with a diammonium phosphate device. The method comprises the following steps: (1) adopting over 48 percent phosphoric acid with a solid content below 3 percent as a raw material, wherein the raw material phosphoric acid singly enters a feeding trough for a preneutralization reactor and a tubular reactor; (2) controlling the technical index of the tubular reactor and the trough for the preneutralization reactor by a positive and negative drop method, namely, using a material with neutralization slightly over 1 in the tubular reactor to neutralize a spraying product with the neutralization below 1 in the trough for the preneutralization reactor to ensure that the neutralization of the total products reach about 1; (3) controlling the pH value of materials at an outlet of a pelletizer to about 4; and (4) using water sealed by a pump, previous washing liquid of an underground collecting tank and process water to supplement washing liquid of each washing tower, and using the washing liquid to regulate the density and the neutralization of slurry in the trough for the preneutralization reactor so as to realize the grade use of the washing liquid of a system. The method can be used for producing the granular monoammonium phosphate with the diammonium phosphate device, which realizes the development requirement of diversified production of devices.
Description
Technical field
The present invention relates to phosphate fertilizer, furthermore, relate to ammonium phosphate fertilizers, relate in particular to diammonium phosphate and monoammonium phosphate.
Background technology
Traditional diammonium phosphate device is furnished with tubular reactor, pre-neutralization groove, even is furnished with the double hose reactor.But can only a kind of product of production diammonium phosphate, neither be very tight to the requirement of raw material.After general phosphoric acid by wet process concentrates, as long as acid just can produced qualified diammonium phosphate product more than 46%.That is to say that most importantly the production diammonium phosphate controls the degree of neutralization of product.In addition, by coarse whiting device rectification and the diammonium phosphate device that comes also increases tubular reactor and secondary and mends the ammonia pipe in rotary drum granulator, improve the high plate of back-up ring of tablets press outlet, increase the filling ratio of material, bring up to about 30% by original 12%.In order to improve throughput, also set up the product screening system, the returning charge ratio was controlled at 4: 1.But with this understanding can only the production diammonium phosphate, can not produce granular monoammonium phosphate.
Summary of the invention
Purpose of the present invention just is to provide the method with producing granular monoammonium phosphate with diammonium phosphate device, with the growth requirement of implement device diversification products production.
The contriver is according to the granulation characteristic and the response characteristic of diammonium phosphate and granular monoammonium phosphate product, and systematic water balance, changes raw material, operational path and operational condition, to realize invention.
The method that the usefulness producing granular monoammonium phosphate with diammonium phosphate device is provided that the contriver provides comprises following measure:
(1) adopt concentration greater than 48%, solid content is raw material less than 3% phosphoric acid; Raw material phosphoric acid advances pre-neutralization reactor and tubular reactor feeding trough separately;
(2) carry out positive and negative drop method control to tubular reactor and pre-neutralization groove technic index, promptly utilize the material of the degree of neutralization slightly high 1 of tubular reactor go in and the pre-neutralization groove be lower than 1 whitewashing product, total product degree of neutralization is reached about 1;
(3) the pH value of control tablets press outlet material is about 4;
(4) washing lotion of replenishing each washing tower with the washings before pump seal water, the underground receiving tank, process water; Utilize washings to regulate pulp density and degree of neutralization in the pre-neutralization groove, realize the cascade utilization of system's washing lotion.
The degree of neutralization of above-mentioned tubular reactor is controlled at 1.3～1.4, and pre-neutralization groove slip degree of neutralization is controlled at 0.6～0.7.
The contriver points out, adopt concentration greater than 48%, solid content is raw material less than 3% phosphoric acid, is that system is stable more because acid is dense high more, the ability of recovery system washing lotion is big more.
Use method of the present invention, can use producing granular monoammonium phosphate with diammonium phosphate device, the growth requirement of implement device diversification products production.
Embodiment
Two series of Wengfu Group Co., Ltd.'s diammonium phosphate device all adopt this technology to carry out switching that diammonium phosphate product switch the to produce granular monoammonium phosphate product mode of changing the line of production, effect is very obvious, save the short product time, reduced production cost, created more economic worth.
Claims (2)
1.1 with the method for producing granular monoammonium phosphate with diammonium phosphate device, its feature comprises:
(1) adopt concentration greater than 48%, solid content is raw material less than 3% phosphoric acid; Raw material phosphoric acid advances pre-neutralization reactor and tubular reactor feeding trough separately;
(2) carry out positive and negative drop method control to tubular reactor and pre-neutralization groove technic index, promptly utilize the material of the degree of neutralization slightly high 1 of tubular reactor go in and the pre-neutralization groove be lower than 1 whitewashing product, make total product degree of neutralization reach 1;
(3) the pH value of control tablets press outlet material is 4;
(4) washing lotion of replenishing each washing tower with the washings before pump seal water, the underground receiving tank, process water; Utilize washings to regulate pulp density and degree of neutralization in the pre-neutralization groove, realize the cascade utilization of system's washing lotion.
2.2 the method for claim 1, the degree of neutralization that it is characterized in that described tubular reactor are 1.3～1.4, pre-neutralization groove slip degree of neutralization is 0.6～0.7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102638001A CN101734954B (en) | 2009-12-31 | 2009-12-31 | Method for producing granular monoammonium phosphate with diammonium phosphate device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102638001A CN101734954B (en) | 2009-12-31 | 2009-12-31 | Method for producing granular monoammonium phosphate with diammonium phosphate device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101734954A true CN101734954A (en) | 2010-06-16 |
| CN101734954B CN101734954B (en) | 2012-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009102638001A Active CN101734954B (en) | 2009-12-31 | 2009-12-31 | Method for producing granular monoammonium phosphate with diammonium phosphate device |
Country Status (1)
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| CN (1) | CN101734954B (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4375980A (en) * | 1978-10-02 | 1983-03-08 | Tennessee Valley Authority | Production of suspension fertilizers from orthophorphoric acid |
| CN1118445C (en) * | 2000-02-01 | 2003-08-20 | 江西贵溪化肥厂 | Process for producing compound diammonium hydrogen phosphate fertilizer |
| CN1235794C (en) * | 2002-03-06 | 2006-01-11 | 四川大学 | Coproduction method of diammonium phosphate and monoammonium phosphate and equipment for neutralizing washing liquid |
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2009
- 2009-12-31 CN CN2009102638001A patent/CN101734954B/en active Active
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| CN101734954B (en) | 2012-04-18 |
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Address after: 550500 Guizhou Province, Qiannan Buyei and Miao Autonomous Prefecture Fuquan Racecourse town Yingbin Road No. 1 Wengfu group Patentee after: WENGFU GROUP Co.,Ltd. Address before: 23, 550002 floor, International Building, No. 57, South City Road, Nanming District, Guiyang, Guizhou Patentee before: WENGFU GROUP Co.,Ltd. |
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