CN1299974C - Method for improving property of dihydrate wet-process phosphoric acid reaction slurry - Google Patents
Method for improving property of dihydrate wet-process phosphoric acid reaction slurry Download PDFInfo
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- CN1299974C CN1299974C CNB2005100106401A CN200510010640A CN1299974C CN 1299974 C CN1299974 C CN 1299974C CN B2005100106401 A CNB2005100106401 A CN B2005100106401A CN 200510010640 A CN200510010640 A CN 200510010640A CN 1299974 C CN1299974 C CN 1299974C
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Abstract
The present invention discloses a method for improving reaction slurry performance of wet-process phosphoric acid dihydrate. The method firstly uses stage equipment for carrying out stage treatment on reaction slurry. The crystal size of ardealite in stage bottom flow is that the proportion of +40 um particles is from 90% to 95%, the proportion of +100 um particles is from 50% to 65% and the proportion of +150 um particle is from 20% to 35%, and the stage bottom flow enters a filter for filtration and washing; the crystal size of the ardealite in stage overflow is that the proportion of-40 mum particles is from 80% to 85% and the proportion of-100 um particles is 100%. The stage overflow is used as a crystal seed, is returned to a reaction tank to carry out further growth and enlargement, and enters the next stage circulation. The filtered and washed ardealite is transferred to the slag ground, diluted phosphoric acid is transferred to a storage tank, primary filter liquor and first washing solution are returned to the reaction tank, and second washing solution is used as first washing water and is returned to a filter to carry out secondary counter current washing. The present invention effectively improves the filtration washing performance of reaction slurry by improving the crystal size of the ardealite.
Description
Technical field
The present invention relates to the production method of dihydrate wet-process phosphoric acid, more particularly, the present invention relates to the improvement that filter and cleaning process in the dihydrate wet-process phosphoric acid production is carried out.
Background technology
Wet-process Phosphoric Acid Production mainly contains two water things, half water thing, Ban Shui-two water recrystallize, four kinds of technical process of two water-half water recrystallize.At present, worldwide prevailing is two water thing technologies.But no matter adopt any technical process, Wet-process Phosphoric Acid Production all needs to obtain thick, neat phosphogypsum crystal, thereby improve the filtration washing performance of reaction slurry, this is the most important link of Wet-process Phosphoric Acid Production, also is the prerequisite that device is obtained good economic benefit.
In the existing dihydrate wet-process phosphoric acid production technology, reaction slurry is directly to enter filter to filter, and adds wash water then and carries out the second adverse current washing.But along with the phosphate rock resource dilution, the phosphorus ore grade that is used for Wet-process Phosphoric Acid Production (characterizes P
2O
5), quality (sign impurity) descends, cause phosphogypsum crystal in small, broken bits, during filtration, stop up the space of filter cloth, filter cake, have a strong impact on the filtration and the scourability of reaction slurry, cause production capacity, washing rate, the Vanadium Pentoxide in FLAKES rate of recovery of device to descend, consuming increases, and seriously restricts the raising of economic benefit.This has become a difficult problem that needs to be resolved hurrily.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, provide in a kind of dihydrate wet-process phosphoric acid production and improve the phosphogypsum crystal granularity, thereby improve the method for reaction slurry filtration washing performance.
Purpose of the present invention is achieved by following technical proposals.
Except as otherwise noted, the percentage ratio that is adopted among the present invention is weight percentage.
The invention provides a kind of method of improving property of dihydrate wet-process phosphoric acid reaction slurry.This method adopts the step of following order:
(1) adopt stage equipment that reaction slurry is carried out stage treatment.
Phosphogypsum crystal granularity in the classification underflow: the shared ratio 90%～95% of+40um particle; The shared ratio 50%～65% of+100um particle, the shared ratio of+150um particle is 20%～35%.Classification underflow enters filter and filters and wash.
Phosphogypsum crystal granularity in the classification overflow: the shared ratio 80%～85% of-40um particle; The shared ratio 100% of-100um particle.The classification overflow is returned reactive tank as crystal seed and is further grown up, increases, and enters classification cycle next time.
(2) phosphogypsum of washing is sent to the slag field after filtration, and dilute phosphoric acid is sent to storage tank, and a first filtrate and a washing lotion are returned reactive tank;
(3) two washing lotions are returned filter as a wash water and are carried out the second adverse current washing.
Wherein:
The described stage equipment of step (1) is to adopt sloping plate grading machine or swirler.
The described classification underflow of step (1) contains solid concentration and brings up to 40%～50% by 28%～36% of charging.
The described classification overflow of step (1) contains solid concentration and drops to 20%～30% by 28%～36% of charging.
Compare with existing dihydrate wet-process phosphoric acid production technology, the present invention has following beneficial effect:
(1) technological process is simple, and institute sets up and invests lowly fully, undergoes technological transformation on former dihydrate wet-process phosphoric acid device easily;
(2) significantly improve the granularity and the distribution of phosphogypsum in the reaction slurry (classification underflow) that enters filter and cleaning process, thereby improved the filtration washing performance of reaction slurry effectively, improved intensity filter, device capbility and washing rate;
(3) improved the solid concentration that contains of the reaction paste (classification underflow) that enters filter and cleaning process, made the growth that has higher liquid-solid ratio to help phosphogypsum crystal in the reactive tank; Simultaneously, reduce required filtered liquid quantity again, can filter more reaction slurry, further improved intensity filter and device capbility.Present method is implemented net effect: the intensity filter of reaction slurry improves more than 15%, and the washing rate improves more than 0.5%.
Description of drawings
Fig. 1 is the process flow diagram of existing dihydrate wet-process phosphoric acid production technology filter and cleaning process;
Fig. 2 is the process flow diagram of dihydrate wet-process phosphoric acid production technology filter and cleaning process of the present invention.
Embodiment
By specific embodiments of the invention given below, can further be well understood to the present invention.But they are not limitation of the invention.
Embodiment 1
At the 70kt P of Yunnan Prov Sanhuan Chemical Co., Ltd
2O
5On/a dihydrate wet-process phosphoric acid the production equipment, adopt swirler that reaction slurry is carried out stage treatment earlier.With contained phosphogypsum crystal granularity be then+the shared ratio 91% of 40um particle ,+the shared ratio 54% of 100um particle ,+the shared ratio 22% of 150um particle, contain solid concentration and be 43% classification underflow and send into that filter filters and washing.
With contained phosphogypsum crystal granularity for the-shared ratio of 40um particle be 82% ,-the shared ratio 100% of 100um particle, contain solid concentration and be 30% classification overflow and send reactive tank back to, the phosphogypsum crystal in small, broken bits that is contained in the classification overflow is further grown up in reactive tank as crystal seed and is increased.
Xi Di phosphogypsum is sent to the slag field after filtration, and dilute phosphoric acid is sent to storage tank, and a first filtrate and a washing lotion are returned reactive tank.Two washing lotions are returned filter as a wash water and are carried out the second adverse current washing.
Implement net effect: the intensity filter of reaction slurry improves 16.6%, and the washing rate improves 0.62%.
Embodiment 2
Except described stage equipment adopted the sloping plate grading machine, other production process was identical with embodiment 1.
Embodiment 3
Repeat embodiment 1, following difference is arranged: with contained phosphogypsum crystal granularity for the+shared ratio 95% of 40um particle ,+the shared ratio 65% of 100um particle ,+the shared ratio 35% of 150um particle, contain solid concentration and be 50% classification underflow and send into that filter filters and washing.With contained phosphogypsum crystal granularity for the-shared ratio of 40um particle be 85% ,-100um particle proportion 100%, contain solid concentration and be 20% classification overflow and send reactive tank back to, the phosphogypsum crystal in small, broken bits that is contained in the classification overflow is further grown up in reactive tank as crystal seed and is increased.Implement net effect: the intensity filter of reaction slurry improves 16.8%, and the washing rate improves 0.65%.
Embodiment 4
Repeat embodiment 1, following difference is arranged: with contained phosphogypsum crystal granularity for the+shared ratio 93% of 40um particle ,+the shared ratio 60% of 100um particle ,+the shared ratio 30% of 150um particle, contain solid concentration and be 45% classification underflow and send into that filter filters and washing.With contained phosphogypsum crystal granularity be-the shared ratio of 40um particle is 83%,-100um particle proportion 100%, contain solid concentration and be 25% classification overflow and send reactive tank back to, the phosphogypsum crystal in small, broken bits that is contained in the classification overflow is further grown up in reactive tank as crystal seed and is increased.Implement net effect: the intensity filter of reaction slurry improves 16.7%, and the washing rate improves 0.63%.
Claims (3)
1. method of improving property of dihydrate wet-process phosphoric acid reaction slurry, this method adopts the step of following order:
(1) adopt stage equipment that reaction slurry is carried out stage treatment, percentage ratio meter by weight, phosphogypsum crystal granularity in the classification underflow: the shared ratio 90%～95% of+40um particle; The shared ratio 50%～65% of+100um particle, the shared ratio of+150um particle is 20%～35%, classification underflow enters filter and filters and wash; Phosphogypsum crystal granularity in the classification overflow: the shared ratio 80%～85% of-40um particle; The shared ratio 100% of-100um particle; The classification overflow is returned reactive tank as crystal seed and is further grown up, increases, and enters classification cycle next time;
(2) phosphogypsum of washing is sent to the slag field after filtration, and dilute phosphoric acid is sent to storage tank, and a first filtrate and a washing lotion are returned reactive tank;
(3) two washing lotions are returned filter as a wash water and are carried out the second adverse current washing.
2. a kind of method of improving property of dihydrate wet-process phosphoric acid reaction slurry according to claim 1, wherein the described stage equipment of step (1) is to adopt swirler or sloping plate grading machine.
3. a kind of method of improving property of dihydrate wet-process phosphoric acid reaction slurry according to claim 1, percentage ratio meter by weight, wherein the described classification underflow of step (1) contains solid concentration and brings up to 40%～50% by 28%～36% of charging; The classification overflow contains solid concentration and drops to 20%～30% by 28%～36% of charging.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100106401A CN1299974C (en) | 2005-02-01 | 2005-02-01 | Method for improving property of dihydrate wet-process phosphoric acid reaction slurry |
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| CNB2005100106401A CN1299974C (en) | 2005-02-01 | 2005-02-01 | Method for improving property of dihydrate wet-process phosphoric acid reaction slurry |
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| CN1669915A CN1669915A (en) | 2005-09-21 |
| CN1299974C true CN1299974C (en) | 2007-02-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102336428A (en) * | 2011-06-30 | 2012-02-01 | 云南云天化国际化工股份有限公司三环分公司 | Method for taking phosphogypsum under wet-process deslagging conditions |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103435021A (en) * | 2013-08-19 | 2013-12-11 | 瓮福（集团）有限责任公司 | Wet process phosphoric acid production device and method |
| CN103520993A (en) * | 2013-10-16 | 2014-01-22 | 瓮福紫金化工股份有限公司 | Filtering cloth washing water filtering system in wet-process phosphoric acid production |
| CN104401959B (en) * | 2014-10-13 | 2016-06-22 | 云南红富化肥有限公司 | A kind of method filtering ardealite employing light phosphoric acid circulation washing |
| CN105502320A (en) * | 2015-12-30 | 2016-04-20 | 昆明川金诺化工股份有限公司 | Method for producing hemihydrated phosphoric acid from medium/low-grade phosphorite |
| CN111892314A (en) * | 2020-08-17 | 2020-11-06 | 云南磷化集团有限公司 | Deep purification method of phosphogypsum |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5236679A (en) * | 1992-05-06 | 1993-08-17 | Freeport-Mcmoran Resource Partners | Removal of aluminum contamination during production of phosphoric acid |
| CN1363513A (en) * | 2001-12-14 | 2002-08-14 | 中国五环化学工程公司 | Process for preparing wet phosphoric acid by dihydrate method |
-
2005
- 2005-02-01 CN CNB2005100106401A patent/CN1299974C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5236679A (en) * | 1992-05-06 | 1993-08-17 | Freeport-Mcmoran Resource Partners | Removal of aluminum contamination during production of phosphoric acid |
| CN1363513A (en) * | 2001-12-14 | 2002-08-14 | 中国五环化学工程公司 | Process for preparing wet phosphoric acid by dihydrate method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102336428A (en) * | 2011-06-30 | 2012-02-01 | 云南云天化国际化工股份有限公司三环分公司 | Method for taking phosphogypsum under wet-process deslagging conditions |
| CN102336428B (en) * | 2011-06-30 | 2013-07-24 | 云南云天化国际化工股份有限公司三环分公司 | Method for taking phosphogypsum under wet-process deslagging conditions |
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| CN1669915A (en) | 2005-09-21 |
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