CN101323441B - Reclaiming method of wet method phosphoric acid ardealite storage yard eluviate water - Google Patents
Reclaiming method of wet method phosphoric acid ardealite storage yard eluviate water Download PDFInfo
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- CN101323441B CN101323441B CN 200710112768 CN200710112768A CN101323441B CN 101323441 B CN101323441 B CN 101323441B CN 200710112768 CN200710112768 CN 200710112768 CN 200710112768 A CN200710112768 A CN 200710112768A CN 101323441 B CN101323441 B CN 101323441B
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- water
- phosphoric acid
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- leaching
- washing
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Abstract
The invention discloses a recovery method of wet-process phosphoric acid phosphogypsum yard eluvial water; the eluvial water of the phosphogypsum yard is conveyed into a circulating water system of a wet-process phosphoric acid device; part of hot recycle washing water which is discharged by a section of tail gas washing tower of a reactive tail gas washing system of the phosphoric acid device is conveyed to a filter cloth washing trough so as to replace a steam condensate which is conveyed by a concentration section of phosphoric acid; circulating water or the eluvial water is used as grinding water directly. The invention supplements the eluvial water into the circulating water system for producing the phosphoric acid so as to replace the steam condensate which is used for washing the filter cloth and fresh process water which is used for grinding, thus leading the eluvial water to be used completely without discharging outside and saving a large amount of fresh process water and energy; furthermore, P2O5 in the eluvial water can be recovered and used, thus reducing the production cost of the whole process.
Description
Technical field
The invention belongs to field of chemical engineering, relate to ardealite storage yard sour water (leaching water) comprehensive utilization, the processing method of specifically a kind of sour water digestibility and utilization in phosphoric acid plant.
Background technology
Wet-process Phosphoric Acid Production is to be raw material with phosphorus ore and sulfuric acid, produces a large amount of industrial residues--phosphogypsum in the technological process, and phosphogypsum is carrying out in the filtering separation process through repeatedly washing with phosphoric acid, but wherein still residual at last a small amount of P
2O
5And F, and be water-soluble partly, when phosphogypsum is met rainwater in stacking process, this part solubility P
2O
5Reaching F can flow out with rainwater, as deals with improperly, can cause the pollution to surrounding enviroment.Therefore, ardealite storage yard need carry out antiseepage and handle and build the sour water treatment unit, the a large amount of sour waters that produced by rainwater utilize waste disposal plant to carry out discharging after the neutralizing treatment, and its shortcoming one is that production cost rises, and the 2nd, the sewage after handling needs discharging.
In order to solve the problem that phosphogypsum leaching water brings, the phosphoric acid by wet process factory that has adopts the wet method deslagging, a large amount of phosphogypsums in the production process are added water to be starched again, phosphogypsum slag slurry after will starching again with pipeline is transported to the wet method stockyard, large-scale water-storing device is built in the stockyard, after phosphogypsum and the sour water natural separation sour water is delivered to phosphoric acid plant and is used for phosphogypsum and starches and wash filter cloth again, recycle.The shortcoming that adopts this method is that the construction investment in stockyard is huge, and at sour water P in the working cycle repeatedly
2O
5And F content is higher, produces some disadvantageous effects to producing.
Summary of the invention
The object of the invention provides a kind of phosphoric acid by wet process ardealite storage yard leaching water recoverying and utilizing method, phosphogypsum leaching water is entered in the circulating water system of phosphoric acid plant be used by adjusting and improve phosphoric acid process, thereby avoids the processing of leaching water and efflux.
The present invention is achieved in that the leaching water usefulness with ardealite storage yard is pumped in the circulating water system of phosphoric acid by wet process device, the thermal cycling washing water part that one section tail gas washing tower of phosphoric acid plant reaction end gas washing system is discharged is delivered to the filter cloth washing groove to substitute the steam condensate of being carried by Phosphoric Acid Concentration workshop section, thermoelectric plant is sent in the steam condensate recovery uses for steam boiler.
The steam condensate of normally carrying with Phosphoric Acid Concentration workshop section on the phosphoric acid by wet process device is washed filter cloth at present, because this vapor condensation liquid temp is higher, and about about 70 ℃ of water temperature, better to the developing result of filter cloth.And the water temperature of the thermal cycling washing water that one section tail gas washing tower of phosphoric acid plant reaction end gas washing system is discharged is also higher, about about 70 ℃, can substitute steam condensate and wash filter cloth.Sewage behind the flushing filter cloth finally is to have entered in the circulating water system of phosphoric acid plant, and circulation cleaning water is the part in the circulating water system, and the part that causes circulating water system to reduce is thus then replenished with leaching water.And the steam condensate of saving can reclaim separately and is sent to hot shop and uses for steam boiler, because this department of the Chinese Academy of Sciences's branch steam condensate does not need softening the processing just can directly use, not only can reduce processing costs, can also the waste heat of steam condensate be utilized, reduce energy consumption.
Described leaching water is added by two sections tail gas washing towers of phosphoric acid plant reaction end gas washing system.The leaching water of ardealite storage yard is precipitation water, except containing a spot of solubility P
2O
5And outside the F, water quality is cleaner, suspended particle is few, leaching water adds two sections tail gas washing towers, can improve the washing tail gas effect, and leaching water is the water temperature that normal temperature is lower than the recirculated water (about about 40 ℃) of sending into two sections tail gas washing towers, the F solubleness of leaching water is higher, therefore, can reduce F content in the tail gas.
The circulating water PH value of the circulating water system of phosphoric acid plant generally has only 1 to 2, can be used as to grind water, because the concentration of acid is low in the recirculated water, and H
+Very fast and breeze reacts, and can not impact equipment.Therefore, in order to increase the utilization of leaching water, as grinding water, the part of minimizing is replenished by leaching water with recirculated water alternative techniques water in the present invention.Or directly will send in the ore grinding device as grinding water from the leaching water part of ardealite storage yard.
The present invention replenishes leaching water in the circulating water system of phosphoric acid production into, to substitute the used steam condensate of flushing filter cloth and to grind used fresh process water, make leaching water to be utilized fully, do not need to efflux, saved a large amount of leaching water treatment expenses, and the P in the leaching water
2O
5Can also recycle, also save a large amount of fresh process waters simultaneously, the steam condensate in the former in addition technology can be utilized again, has saved the energy, has reduced the production cost of whole technology, with 200,000 tons of P
2O
5/ year wet-process phosphoric acid production plant is an example, can save 3,200,000 yuan of costs every year, can obtain than remarkable economic efficiency and social benefit.
Description of drawings
Fig. 1 is an ardealite storage yard leaching water conservancy process flow sheet of the present invention.
Embodiment
As shown in Figure 1, be divided into two-way by pipeline after the leaching water of slag field leaching water collecting tank 1 is extracted by pump 2 and send into circulating water system, one route pipeline 3 is fed through in two sections tail gas washing towers 4, the tail gas that mixes two sections tail gas washing towers with recirculated water from circulating water system carries out circulation cleaning, in the washings circulation groove 7 of washing water in two sections tail gas washing towers 4 by pipeline 5 overflows to section tail gas washing tower 8, the washing water part of one section washing tail gas pump 6 conveying is returned in one section tail gas washing tower 8 and is carried out circulation cleaning, another part is sent into filter cloth washing groove 10 by pipeline 11, is carried the filter cloth washing and the phosphogypsum washing of removing phosphorus supply gypsum filter by filter cloth washing pump 9.Leaching water another route pipeline 12 in slag field is directly delivered in the wet-milling 13, is used for ore grinding.
The present invention is applied in 200,000 tons of P
2O
5Per hour can utilize leaching water 100m in the/year wet-process phosphoric acid production plant
3, i.e. the 70t/h steam condensate of low-pressure steam generation is no longer entered in the phosphoric acid circulating water system by the filter cloth washing link, is sent to thermoelectric plant but reclaim separately, uses for steam boiler; Can reduce and grind with fresh process water consumption 30m
3/ h; The internal recycling water consumption is by original 3500m
3/ h is reduced to 3400m
3/ h, the 100m that circulating water system reduces
3/ h water consumption is replenished by ardealite storage yard leaching water.Therefore, leaching water can utilize fully, does not need to efflux, and reclaims ardealite storage yard leaching water 720,000 m
3/ year, in addition, the P in the leaching water
2O can obtain reclaiming annual recyclable P
2O
5About 1000t, about 2,200,000 yuan/year of recovery value; Reclaim phosphoric acid production low-pressure steam phlegma 500,000 t/, save and be worth about 800,000 yuan/year; Reduce process water and consume 210,000 t/, save and be worth about 200,000 yuan/year.The present invention is at 200,000 tons of P
2O
5Use in/year the device and strive for 3,200,000 yuan of direct economic benefits, environment and obvious social benefit.
Ore grinding water of the present invention also can adopt the recirculated water supply, and required additional slag field leaching water is directly delivered in two sections tail gas washing towers, enters circulating water system by washing water.
Claims (4)
1. phosphoric acid by wet process ardealite storage yard leaching water recoverying and utilizing method, it is characterized in that: the leaching water of ardealite storage yard is used be pumped in the circulating water system of phosphoric acid by wet process device, the thermal cycling washing water part that one section tail gas washing tower of phosphoric acid plant reaction end gas washing system is discharged is delivered to the filter cloth washing groove to substitute the steam condensate of being carried by Phosphoric Acid Concentration workshop section.
2. phosphoric acid by wet process ardealite storage yard leaching water recoverying and utilizing method according to claim 1, it is characterized in that: described leaching water is entered in the circulating water system of phosphoric acid by wet process device by two sections tail gas washing towers of phosphoric acid plant reaction end gas washing system.
3. phosphoric acid by wet process ardealite storage yard leaching water recoverying and utilizing method according to claim 1 and 2 is characterized in that: as grinding water, the part that circulating water system reduces is replenished with leaching water with recirculated water alternative techniques water.
4. phosphoric acid by wet process ardealite storage yard leaching water recoverying and utilizing method according to claim 1 and 2 is characterized in that: the leaching water part from ardealite storage yard is sent in the ore grinding device as grinding water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710112768 CN101323441B (en) | 2007-06-16 | 2007-06-16 | Reclaiming method of wet method phosphoric acid ardealite storage yard eluviate water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710112768 CN101323441B (en) | 2007-06-16 | 2007-06-16 | Reclaiming method of wet method phosphoric acid ardealite storage yard eluviate water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101323441A CN101323441A (en) | 2008-12-17 |
| CN101323441B true CN101323441B (en) | 2011-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200710112768 Active CN101323441B (en) | 2007-06-16 | 2007-06-16 | Reclaiming method of wet method phosphoric acid ardealite storage yard eluviate water |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103213961B (en) * | 2012-05-18 | 2014-09-17 | 襄阳泽东化工有限公司 | Closed cyclic utilization method for production water of monoammonium phosphate |
| CN104058377A (en) * | 2014-06-06 | 2014-09-24 | 安徽省司尔特肥业股份有限公司 | Clean production process of wet process phosphoric acid |
| CN108328793A (en) * | 2018-02-08 | 2018-07-27 | 瓮福达州化工有限责任公司 | A kind of mine tailing wastewater cyclic utilization system |
| CN111704304A (en) * | 2020-07-09 | 2020-09-25 | 瓮福（集团）有限责任公司 | Phosphorus-fluorine sewage recycling process of phosphoric acid purifying device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU789390A1 (en) * | 1979-06-19 | 1980-12-23 | Производственное Объединение "Техэнергохимпром" | Method of preparing extractional phosphoric acid |
| CN1876204A (en) * | 2006-07-06 | 2006-12-13 | 上海南化水处理技术工程有限公司 | Ardealite innocent treatment method |
-
2007
- 2007-06-16 CN CN 200710112768 patent/CN101323441B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU789390A1 (en) * | 1979-06-19 | 1980-12-23 | Производственное Объединение "Техэнергохимпром" | Method of preparing extractional phosphoric acid |
| CN1876204A (en) * | 2006-07-06 | 2006-12-13 | 上海南化水处理技术工程有限公司 | Ardealite innocent treatment method |
Non-Patent Citations (1)
| Title |
|---|
| 段付岗.传统法磷铵装置中废水利用探讨.《磷肥与复肥》.1997,(第1期),29-31. * |
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