CN107311136B - Method and device for producing granular sodium tripolyphosphate - Google Patents
Method and device for producing granular sodium tripolyphosphate Download PDFInfo
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- CN107311136B CN107311136B CN201710625554.4A CN201710625554A CN107311136B CN 107311136 B CN107311136 B CN 107311136B CN 201710625554 A CN201710625554 A CN 201710625554A CN 107311136 B CN107311136 B CN 107311136B
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- furnace
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- neutralization
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/38—Condensed phosphates
- C01B25/40—Polyphosphates
- C01B25/41—Polyphosphates of alkali metals
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)
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Abstract
A process for producing granular sodium tripolyphosphate comprises the steps of adding 80-85% phosphoric acid and 48% sodium hydroxide into a neutralization reaction kettle, and reacting for 1 hour; after the reaction is finished, filtering the neutralization solution, conveying the neutralization solution to a neutralization solution storage tank, conveying slurry in the neutralization solution storage tank to a spray rod through a centrifugal pump, spraying to form 40-60 fine neutralization solution columns, contacting with a waterfall-shaped sodium tripolyphosphate material which is continuously raised in a dynamic polymerization furnace, dehydrating and polymerizing the feed solution in the dynamic polymerization furnace at high temperature for 40-90 minutes, and polymerizing the feed solution into a granular sodium tripolyphosphate product after returning the feed for a period of time; and cooling the product by a cooling roller, screening by a rotary vibration screen, and then packaging in a finished product bin. The invention realizes the production of granular sodium tripolyphosphate products by adding a shoveling plate and a baffle plate in a dynamic polymerization furnace, forming 40-60 small spray holes on one side of a spray lance and a mode of circulating returning materials. The granular sodium tripolyphosphate product has the advantages of large apparent density, difficult hardening during dissolution and the like.
Description
Technical Field
The invention belongs to the technical field of production processes of phosphate products, and particularly relates to a process method and a device for producing granular sodium tripolyphosphate.
Background
The prior traditional production process technology of sodium tripolyphosphate is as follows: sodium carbonate or caustic soda and phosphoric acid are used as raw materials, qualified neutralization liquid is prepared through neutralization reaction, sodium tripolyphosphate is polymerized through two steps of drying and polymerization or directly through one step in a polymerization furnace, and qualified products are packaged through cooling, screening and packaging. The produced sodium tripolyphosphate product is usually powdery in appearance, the apparent density is relatively small and is 0.6-0.8 g/mL, a sample is easy to harden when dissolved, and dust is easy to generate during production and use. The invention realizes the production of granular sodium tripolyphosphate by changing the original material spraying form, additionally arranging the shoveling plates and the baffle plates in the polymerization furnace and adopting a circulating material returning mode, and changes the condition that the material form of the sodium tripolyphosphate product is single. The granularity of the prepared sodium tripolyphosphate is more than 60% of 2.00mm, the apparent density is 1.0 g/mL-1.4 g/mL, and the sample has good fluidity and no hardening phenomenon in the dissolving process.
Disclosure of Invention
The invention aims to provide a process method and a device for producing granular sodium tripolyphosphate, and aims to solve the technical problems, the process method is realized by the following modes:
a process method for producing granular sodium tripolyphosphate comprises the following specific steps:
1) Adding 80-85% phosphoric acid and 48% sodium hydroxide into a neutralization reaction kettle, controlling the neutralization value to be within the range of 2.8-3.2, and reacting for about 1 hour;
2) Filtering the neutralization solution obtained in the step 1), conveying the filtered neutralization solution to a neutralization solution storage tank, and starting steam to keep the temperature of the neutralization solution in the neutralization solution storage tank within the range of 85-95 ℃;
3) The slurry of the neutralization liquid storage tank is conveyed to a spray boom through a centrifugal pump of 0.01 Mpa-0.05 Mpa to spray, 40-60 fine neutralization liquid columns are formed and are contacted with a waterfall-shaped sodium tripolyphosphate material which is continuously raised in a dynamic polymerization furnace, and the feed liquid is dehydrated and polymerized for 40-90 minutes at high temperature in the dynamic polymerization furnace and then is subjected to material returning operation for a period of time, so that a granular sodium tripolyphosphate product can be polymerized;
4) Cooling the product by a cooling roller, screening by a rotary vibration screen, and then packaging in a finished product bin;
5) And 3) dedusting tail gas at the tail of the dynamic polymerization furnace in the step 3) through a cyclone dust collector, then feeding the tail gas into an air box type pulse bag dust collector for further dedusting, and then discharging the tail gas into the atmosphere through a tail gas fan.
The temperature range of the furnace tail of the dynamic polymerization furnace in the step 3) is 280-350 ℃.
A device for producing granular sodium tripolyphosphate comprises a phosphoric acid storage tank, a liquid caustic soda storage tank, a neutralization reaction kettle, a material mixing pump, a filter, a neutralization liquid storage tank, a centrifugal pump, a dynamic polymerization furnace, a material distribution valve, a screw conveyor, a material returning roller, a lifting machine, a cooling roller, a rotary vibration sieve and a finished product bin, wherein the phosphoric acid storage tank and the liquid caustic soda storage tank are communicated with the top end of the neutralization reaction kettle through pipelines, the bottom of the neutralization reaction kettle is connected with the inlet of the material mixing pump through a pipeline with a valve, the outlet of the material mixing pump is connected with the inlet of the filter through a pipeline with a valve, the outlet of the filter is communicated with the top end of the neutralization liquid storage tank through a pipeline with a valve, the outlet of the centrifugal pump is connected with the inlet of the centrifugal pump through a pipeline with a valve, the outlet of the centrifugal pump is arranged at the middle part of a furnace end of the dynamic polymerization furnace close to the edge, the dynamic polymerization furnace is provided with a gas burner, the tail of the dynamic polymerization furnace is connected with the material distribution valve, two outlets of the material distribution valve are respectively connected with the inlet of the screw conveyor, one of the outlet of the spiral conveyor is sequentially connected with the material returning roller, the furnace end of the dynamic polymerization furnace is connected with the lifting machine, and the outlet of the dynamic polymerization furnace, the other spiral vibration sieve, and the dynamic polymerization furnace end of the dynamic polymerization furnace is connected with the lifting machine.
Further, this patent has still designed cyclone, gas tank formula pulse bag dust collector and tail gas fan including, dynamic polymerization stove tail connects gradually cyclone, gas tank formula pulse bag dust collector and tail gas fan.
40-60 spray holes with the aperture of 1-3 mm are arranged on one side of the spray rod.
10 to 20 rectangular, trapezoidal or triangular shoveling plates are embedded in the dynamic polymerization furnace, and a circular ring-shaped baffle is embedded in the middle of the dynamic polymerization furnace.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of the spray bar, the top view being a front view and the bottom view being a side view.
FIG. 3 is a schematic view of a dynamic polymerization furnace, wherein the left side is a front view and the right side is a side view.
The marks in the figure are respectively: 1. phosphoric acid storage tank, 2, liquid caustic soda storage tank, 3, neutralization reaction kettle, 4, knockout pump, 5, filter, 6, neutralization solution storage tank, 7, centrifugal pump, 8, dynamic polymerization furnace, 9, material separating valve, 10, screw conveyor I, 11, screw conveyor II, 12, material returning roller, 13, lifting machine, 14, cooling roller, 15, lifting machine, 16, rotary vibrating screen, 17, finished product bin, 18, cyclone dust collector, 19, air box type pulse bag dust collector, 20, tail gas fan, 21, spray rod, 22, spray hole, 23, furnace end, 24, shoveling plate, 25 and baffle.
FIG. 4 is a schematic process flow diagram of the present invention.
Most preferred embodiments
The following detailed description of the present invention and the technical effects achieved by the preferred embodiments are described in further detail with reference to the accompanying drawings and the most preferred embodiments.
As shown in fig. 1, the spray bar is a schematic view.
As shown in FIG. 2, the internal structure of the dynamic polymerization furnace is schematically illustrated.
As shown in FIG. 3, the process for producing granular sodium tripolyphosphate comprises the following process steps:
adding 85 percent phosphoric acid and 48 percent sodium hydroxide into a neutralization reaction kettle, controlling the neutralization value to be within the range of 2.8-3.2, and reacting for about 1 hour; after the reaction is finished, filtering the neutralization solution, conveying the neutralization solution to a neutralization solution storage tank, conveying slurry in the neutralization solution storage tank to a spray boom through a centrifugal pump of 0.04Mpa to spray, forming 50 fine neutralization solution columns, contacting with a waterfall-shaped sodium tripolyphosphate material which is continuously raised in a dynamic polymerization furnace, dehydrating and polymerizing the feed solution in the dynamic polymerization furnace for 60-70 minutes at high temperature, and polymerizing the feed solution into a granular sodium tripolyphosphate product after material returning; and cooling the product by a cooling roller, screening by a rotary vibration screen, feeding the product into a finished product bin, and packaging the product into a qualified product.
And tail gas at the furnace tail of the dynamic polymerization furnace is dedusted by a cyclone deduster, enters an air box type pulse bag deduster for further dedusting, and is exhausted into the atmosphere by a tail gas fan.
The granularity of the sodium tripolyphosphate prepared by the preferable scheme is more than 75% when being more than 2.00mm, the apparent density is 1.2g/mL, and the sodium tripolyphosphate has good fluidity and no hardening phenomenon in the sample dissolving process.
As shown in figure 4, the device for producing granular sodium tripolyphosphate comprises a phosphoric acid storage tank 1, a liquid alkali storage tank 2, a neutralization reaction kettle 3, a knockout pump 4, a filter 5, a neutralization liquid storage tank 6, a centrifugal pump 7, a dynamic polymerization furnace 8, a material distribution valve 9, a first screw conveyor 10, a second screw conveyor 11, a material return roller 12, an elevator 13, a cooling roller 14, an elevator 15, a rotary vibration sieve 16 and a finished product bin 17, wherein the phosphoric acid storage tank 1 and the liquid alkali storage tank 2 are both communicated with the top end of the neutralization reaction kettle 3 through pipelines, the bottom of the neutralization reaction kettle 3 is connected with an inlet of the knockout pump 4 through a pipeline with a valve, an outlet of the knockout pump 4 is connected with an inlet of the filter 5 through a pipeline with a valve, an outlet of the filter 5 is communicated with the top end of the neutralization liquid storage tank 6 through a pipeline with a valve, the bottom of the neutralization liquid storage tank 6 is connected with an inlet of the centrifugal pump 7 through a pipeline with a valve, an outlet of the centrifugal pump 7 is connected with a pipeline with a dynamic polymerization furnace head, a furnace head is arranged at one side of the dynamic polymerization furnace, a furnace is arranged near the edge of the furnace, an outlet of the dynamic polymerization furnace 8, an outlet of the furnace is connected with the first screw conveyor 13, and a furnace tail of the spiral vibration sieve 13, and a furnace is connected with the spiral conveyer 13, and a furnace 11, and a furnace tail of the dynamic polymerization furnace is connected with the dynamic polymerization furnace 13, and a furnace 17, and a furnace tail of the spiral conveyer 17, and a furnace is connected with the dynamic polymerization furnace tail of the conveyer 13, and a furnace tail of the spiral vibration sieve 17, and a furnace tail of the conveyer 17, and a furnace 13.
Further, this patent has still designed cyclone 18, gas tank formula pulse bag dust collector 19 and tail gas fan 20 including, 8 stove tails of developments polymerization furnace connect gradually cyclone 18, gas tank formula pulse bag dust collector 19 and tail gas fan 20.
58 spray holes with the aperture of 1.2mm are arranged on one side of the spray rod.
15 rectangular, trapezoidal or triangular shoveling plates are embedded in the dynamic polymerization furnace, and a circular ring-shaped baffle is embedded in the middle of the dynamic polymerization furnace.
Claims (4)
1. A method for producing granular sodium tripolyphosphate is characterized by comprising the following specific steps:
(1) Adding 80-85% phosphoric acid and 48% sodium hydroxide into a neutralization reaction kettle, controlling the neutralization value to be within the range of 2.8-3.2, and reacting for 1 hour;
(2) Filtering the neutralization solution obtained in the step (1), conveying the neutralization solution to a neutralization solution storage tank, and starting steam to keep the temperature of the neutralization solution in the neutralization solution storage tank within the range of 85-95 ℃;
(3) Conveying the slurry of the neutralizing liquid storage tank to a spray boom through a centrifugal pump of 0.01-0.05 Mpa to spray materials to form 40-60 fine neutralizing liquid columns, contacting with a waterfall-shaped sodium tripolyphosphate material which is continuously raised in a dynamic polymerization furnace, dehydrating and polymerizing the feed liquid in the dynamic polymerization furnace for 40-90 minutes at high temperature, and polymerizing the feed liquid into a granular sodium tripolyphosphate product after material returning operation; 10 to 20 rectangular, trapezoidal or triangular shoveling plates are embedded in the dynamic polymerization furnace, and a circular ring-shaped baffle is embedded in the middle of the dynamic polymerization furnace;
(4) Cooling the product by a cooling roller, screening by a rotary vibration screen, and then packaging in a finished product bin;
(5) And (4) dedusting tail gas at the tail of the dynamic polymerization furnace in the step (3) through a cyclone dust collector, then feeding the tail gas into an air box type pulse bag dust collector for further dedusting, and then discharging the tail gas into the atmosphere through a tail gas fan.
2. The process for producing granular sodium tripolyphosphate according to claim 1, characterized in that: the temperature range of the furnace tail of the dynamic polymerization furnace in the step 3) is 280-350 ℃.
3. The utility model provides a device of production graininess sodium tripolyphosphate, includes phosphoric acid storage tank, liquid caustic soda storage tank, neutralization reaction cauldron, material pump, filter, neutralization liquid storage tank, centrifugal pump, dynamic polymerization stove, depiler valve, screw conveyer, material returning cylinder, lifting machine, cooling drum, sieve, finished product feed bin vibrate soon, its characterized in that:
the phosphoric acid storage tank and the liquid caustic soda storage tank are respectively communicated with the top end of a neutralization reaction kettle through pipelines, the bottom of the neutralization reaction kettle is connected with an inlet of a material beating pump through a pipeline with a valve, an outlet of the material beating pump is connected with an inlet of a filter through a pipeline with a valve, an outlet at the bottom of the filter is communicated with the top end of a neutralization liquid storage tank through a pipeline, the bottom of the neutralization liquid storage tank is connected with an inlet of a centrifugal pump through a pipeline with a valve, an outlet of the centrifugal pump is connected with a spray rod through a pipeline with a valve, 40-60 spray holes with the aperture of 1-3 mm are distributed at one side of the spray rod, the spray rod is arranged at the middle part close to one side of the edge of a furnace head of the dynamic polymerization furnace, the furnace head of the dynamic polymerization furnace is provided with a gas burner, the furnace tail of the dynamic polymerization furnace is connected with a material distributing valve, two outlets of the material distributing valve are respectively connected with inlets of two spiral conveyors, one of which is sequentially connected with a material returning roller and a lifter, an outlet of the lifter is connected with the furnace head of the dynamic polymerization furnace through a pipeline, and the other spiral conveyor is sequentially connected with a cooling roller, a lifter, a rotary vibrating screen and a finished product bin; 10 to 20 rectangular, trapezoidal or triangular shoveling plates are embedded in the dynamic polymerization furnace, and a circular ring-shaped baffle is embedded in the middle of the dynamic polymerization furnace.
4. The apparatus for producing granular sodium tripolyphosphate according to claim 3, characterized in that: the device comprises a dynamic polymerization furnace, wherein an outlet of the dynamic polymerization furnace is also connected with a cyclone dust collector, the cyclone dust collector is connected with an air box type pulse bag dust collector, and the air box type pulse bag dust collector is connected with a tail gas fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710625554.4A CN107311136B (en) | 2017-07-27 | 2017-07-27 | Method and device for producing granular sodium tripolyphosphate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710625554.4A CN107311136B (en) | 2017-07-27 | 2017-07-27 | Method and device for producing granular sodium tripolyphosphate |
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| CN107311136A CN107311136A (en) | 2017-11-03 |
| CN107311136B true CN107311136B (en) | 2023-03-31 |
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| CN201710625554.4A Active CN107311136B (en) | 2017-07-27 | 2017-07-27 | Method and device for producing granular sodium tripolyphosphate |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113213442A (en) * | 2021-04-28 | 2021-08-06 | 贵州福泉川东化工有限公司 | Mineralization-integrated low-residual low-emission phosphorus deep processing equipment and using method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3469938A (en) * | 1967-07-28 | 1969-09-30 | Fmc Corp | Production of hydrated sodium tripolyphosphate |
| DE1729232B1 (en) * | 1967-12-20 | 1971-07-15 | Knapsack Ag | Process and device for the production of salts from thin solutions or suspensions containing the latter |
| CN103159199B (en) * | 2013-03-29 | 2016-05-04 | 湖北兴发化工集团股份有限公司 | A kind of production method of instant type sodium phosphate trimer |
| CN205773363U (en) * | 2016-05-19 | 2016-12-07 | 贵州省惠水川东化工有限公司 | A kind of revolution polyfurnace |
| CN106241768A (en) * | 2016-08-10 | 2016-12-21 | 四川蓝海化工（集团）有限公司 | A kind of process producing sodium tripolyphosphate and device |
| CN207294182U (en) * | 2017-07-27 | 2018-05-01 | 湖北兴发化工集团股份有限公司 | A kind of device for producing graininess sodium tripolyphosphate |
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