CN103991854A - Method for increasing and stabilizing neutralization defluorination concentration in phosphoric acid by wet process - Google Patents
Method for increasing and stabilizing neutralization defluorination concentration in phosphoric acid by wet process Download PDFInfo
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- CN103991854A CN103991854A CN201410070696.5A CN201410070696A CN103991854A CN 103991854 A CN103991854 A CN 103991854A CN 201410070696 A CN201410070696 A CN 201410070696A CN 103991854 A CN103991854 A CN 103991854A
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Abstract
A method for increasing and stabilizing neutralization defluorination concentration in phosphoric acid by wet process. The invention adopts the following process: 1) sending phosphoric acid by wet process with the concentration, calculated by P2O5, of 100-140 g/L, into a first stage of re-dissolution slot for conducting re-dissolution with a second stage of thick paste; 2), sending the slurry after re-dissolution into a dilution tank and adding white phosphorus fertilizer washing water with concentration, calculated by P2O5, of 40-60 g/L; and 3), sending the diluted phosphoric acid into a reaction tank, adding heavy calcium slurry for a first stage of neutralization and defluorination. The technology has the following beneficial effects: the process flow of an original production process does not change, and only one white phosphorus fertilizer washing water transfer pool needs to be added, so as to effectively wash white phosphorus fertilizer; all the dilution water is white phosphorus fertilizer washing water to reduce water consumption of the system; the defluorination effect is more stable and in favor of neutralization defluorination operation control, so as to provide stability for the subsequent process; the P2O5 concentration of a supernatant in a second stage of neutralization defluorination is increased to 10-20 g/L, system capacity is improved by 15-30%, and the economic benefits of enterprises are increased.
Description
Technical field
The invention relates to diluted acid method calcium hydrophosphate fodder phosphoric acid by wet process in and the method for defluorinate process stabilization concentration.More particularly, be in efficient recovery and the fertile washing water of digestion white phosphorus and stable phosphoric acid by wet process and the method for defluorinate concentration.
Background technology
Secondly existingly in calcium hydrophosphate fodder is produced, first produce phosphoric acid by wet process, phosphoric acid by wet process is through in one section, two sections and defluorinate, again to three sections of finished products neutralizations.
In Wet-process Phosphoric Acid Production, phosphoric acid by wet process concentration is generally P
2o
5concentration is 100-140(g/L), if excessive concentration can cause: (1) washing rate declines; (2) system jams is too fast; (3) aggravation production system extent of corrosion.
The too low meeting of concentration causes in (1) one section and two sections of thick oars of defluorinate return molten weak effect; In (2) one sections, two sections and defluorinate production capacity decline; Fertilizer grade secondary calcium phosphate (being commonly called as white phosphorus fertilizer) the washing water digestive difficulties producing with defluorinate in (3) one sections; In (4) one sections, two sections and defluorinate clear liquid concentration low, affect in one, two section and defluorination effect.
And the fertile washing water of white phosphorus are directly to enter defluorination reaction groove in two sections at present, can cause like this: (1) white phosphorus fertilizer can not get effective washing washing water digestive difficulties; In (2) one, two sections and defluorinate clear liquid concentration low, affect in one, two section and defluorination effect; In (3) one, two sections and defluorinate production capacity decline; In (4) one, two sections and defluorinate fluctuation of concentration large, be unfavorable for rear operation stable operation.How to improve for this reason and stablize in one, two section and defluorinate clear liquid concentration this be that calcium hydrophosphate fodder is produced and failed to obtain separating a technical solution difficult problem.
Summary of the invention
The object of the invention is for the deficiencies in the prior art part, provide in a kind of raising and stable phosphoric acid by wet process and defluorinate concentration method.The object of the invention is to realize by following technical solution.
In a kind of raising and stable phosphoric acid by wet process, with defluorinate concentration method, feature of the present invention is to adopt following technological process:
1), phosphoric acid by wet process concentration is (with P
2o
5meter) be 100-140g/L, enter one section and return fluid bowl and two sections of thick slurries return molten;
2), returning slip after molten enters dilution trap and adds the fertile washing water of white phosphorus; Washing water concentration is with P
2o
5count 40-60g/L;
3) phosphoric acid, after dilution enters reactive tank, adds coarse whiting slurry to carry out in one section and defluorinate;
4), in one section and defluorinate slip squeeze into one section of thickener sedimentation, supernatant liquid enters in two sections and defluorination reaction groove, the fertile thick slurry of lower floor white phosphorus enters after thickener sedimentation and washs with centrifugation, filtrate enters thickener sedimentation, supernatant liquid enters in two sections and defluorination reaction groove, and the fertile thick slurry of lower floor's white phosphorus washs through centrifugation again.The fertile washing water of white phosphorus enter transfer pond, return in one section and defluorinate dilution trap;
5), in two sections and defluorination reaction groove add milk of lime again in and defluorinate, completely reacted slip enters two sections of settling pools, supernatant liquid is for three sections of finished products neutralizations, the thick slurry of lower floor returns to one section and returns fluid bowl;
Through in one, two section and after defluorinate, in two sections and defluorinate clear liquid P
2o
5concentration is with P
2o
5count 60-70g/L, P
2o
5/ F is 280-350, the production requirement of operation after meeting, on original production method basis, improve two sections in and defluorinate clear liquid P
2o
5concentration 10-20 g/L.
This Technology, compared with existing producing and manufacturing technique, has following beneficial effect:
1, not doing technical process in original production technique changes.Only need to increase the fertile washing water transfer of white phosphorus pond.
2, white phosphorus fertilizer is able to effective washing, the fertile P of white phosphorus
2o
5water≤3%.
3, dilution water all adopts the fertile washing water of white phosphorus, reduces system water amount.
4, in two sections and defluorinate clear liquid concentration (with P
2o
5meter) 60-70 g/L, P
2o
5/ F is 280-350.
5, defluorination effect is more stable.In being conducive to, control with defluorinate operation.
6, for rear process operations provides stability.
7, improve in two sections and defluorinate clear liquid P
2o
5concentration 10-20g/L, improves system production capacity 15-30%, improves the economic benefit of enterprise.
Brief description of the drawings
Fig. 1 is production technological process of the present invention.
Embodiment
In a kind of raising and stable phosphoric acid by wet process, with defluorinate concentration method, feature of the present invention is to adopt following technological process:
1), phosphoric acid by wet process concentration is (with P
2o
5meter) be 100-140g/L, enter one section and return fluid bowl and two sections of thick slurries return molten;
2), returning slip after molten enters dilution trap and adds the fertile washing water of white phosphorus; Washing water concentration is with P
2o
5count 40-60g/L;
3) phosphoric acid, after dilution enters reactive tank, adds coarse whiting slurry to carry out in one section and defluorinate;
4), in one section and defluorinate slip squeeze into one section of thickener sedimentation, supernatant liquid enters in two sections and defluorination reaction groove, the fertile thick slurry of lower floor white phosphorus enters after thickener sedimentation and washs with centrifugation, filtrate enters thickener sedimentation, supernatant liquid enters in two sections and defluorination reaction groove, and the fertile thick slurry of lower floor's white phosphorus washs through centrifugation again.The fertile washing water of white phosphorus enter transfer pond, return in one section and defluorinate dilution trap;
5), in two sections and defluorination reaction groove add milk of lime again in and defluorinate, completely reacted slip enters two sections of settling pools, supernatant liquid is for three sections of finished products neutralizations, the thick slurry of lower floor returns to one section and returns fluid bowl;
Through in one, two section and after defluorinate, in two sections and defluorinate clear liquid P
2o
5concentration is with P
2o
5count 60-70g/L, P
2o
5/ F is 280-350, the production requirement of operation after meeting, on original production method basis, improve two sections in and defluorinate clear liquid P
2o
5concentration 10-20 g/L.
Case study on implementation
Taking the calcium hydrophosphate fodder device of 80,000 tons/year of throughput as example, by the technology of the present invention, device throughput after transformation is reached to the throughput of 100,000 tons/year of calcium hydrophosphate fodders, and in one, two section and defluorinate transform, just change the digestion method of the fertile washing water of white phosphorus, just meet in rear three sections of finished products of operation and with sour.Raising system production capacity 20%.
Claims (1)
- Improve and stable phosphoric acid by wet process in and a defluorinate concentration method, it is characterized in that, adopt following technological process:1), phosphoric acid by wet process concentration, with P 2o 5meter, is 100-140g/L, enters one section and returns fluid bowl and two sections of thick slurries return molten;2), returning slip after molten enters dilution trap and adds the fertile washing water of white phosphorus; Washing water concentration is with P 2o 5count 40-60g/L;3) phosphoric acid, after dilution enters reactive tank, adds coarse whiting slurry to carry out in one section and defluorinate;4), in one section and defluorinate slip squeeze into one section of thickener sedimentation, supernatant liquid enters in two sections and defluorination reaction groove, the fertile thick slurry of lower floor white phosphorus enters after thickener sedimentation and washs with centrifugation, filtrate enters thickener sedimentation, supernatant liquid enters in two sections and defluorination reaction groove, and the fertile thick slurry of lower floor's white phosphorus washs through centrifugation again; The fertile washing water of white phosphorus enter transfer pond, return in one section and defluorinate dilution trap;5), in two sections and defluorination reaction groove add milk of lime again in and defluorinate, completely reacted slip enters two sections of settling pools, supernatant liquid is for three sections of finished products neutralizations, the thick slurry of lower floor returns to one section and returns fluid bowl;Through in one, two section and after defluorinate, in two sections and defluorinate clear liquid P 2o 5concentration is with P 2o 5count 60-70g/L, P 2o 5/ F is 280-350, the production requirement of operation after meeting, on original production method basis, improve two sections in and defluorinate clear liquid P 2o 5concentration 10-20 g/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410070696.5A CN103991854B (en) | 2014-02-28 | 2014-02-28 | One improves and stablizes in phosphoric acid by wet process and defluorinate concentration method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410070696.5A CN103991854B (en) | 2014-02-28 | 2014-02-28 | One improves and stablizes in phosphoric acid by wet process and defluorinate concentration method |
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| Publication Number | Publication Date |
|---|---|
| CN103991854A true CN103991854A (en) | 2014-08-20 |
| CN103991854B CN103991854B (en) | 2016-08-17 |
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ID=51306236
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|---|---|---|---|
| CN201410070696.5A Active CN103991854B (en) | 2014-02-28 | 2014-02-28 | One improves and stablizes in phosphoric acid by wet process and defluorinate concentration method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106698379A (en) * | 2017-01-20 | 2017-05-24 | 昆明川金诺化工股份有限公司 | Method for improving defluorination yield by two-stage white fertilizer re-dissolution |
| CN111747390A (en) * | 2020-08-10 | 2020-10-09 | 朱宇杰 | Feed-grade calcium phosphate salt production system and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101058414A (en) * | 2007-06-06 | 2007-10-24 | 四川绵竹新清华化工有限责任公司 | Reused process for waste water in calcium hydrogen orthophosphate production |
| CN102807201A (en) * | 2012-02-09 | 2012-12-05 | 昆明川金诺化工股份有限公司 | Method for preparing feed-grade calcium hydrophosphate by wet-process phosphoric acid organic extraction and purification raffinate |
-
2014
- 2014-02-28 CN CN201410070696.5A patent/CN103991854B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101058414A (en) * | 2007-06-06 | 2007-10-24 | 四川绵竹新清华化工有限责任公司 | Reused process for waste water in calcium hydrogen orthophosphate production |
| CN102807201A (en) * | 2012-02-09 | 2012-12-05 | 昆明川金诺化工股份有限公司 | Method for preparing feed-grade calcium hydrophosphate by wet-process phosphoric acid organic extraction and purification raffinate |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106698379A (en) * | 2017-01-20 | 2017-05-24 | 昆明川金诺化工股份有限公司 | Method for improving defluorination yield by two-stage white fertilizer re-dissolution |
| CN111747390A (en) * | 2020-08-10 | 2020-10-09 | 朱宇杰 | Feed-grade calcium phosphate salt production system and method |
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| Publication number | Publication date |
|---|---|
| CN103991854B (en) | 2016-08-17 |
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