CN217887267U - Ammonium heptamolybdate continuous production device - Google Patents
Ammonium heptamolybdate continuous production device Download PDFInfo
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- CN217887267U CN217887267U CN202221346902.7U CN202221346902U CN217887267U CN 217887267 U CN217887267 U CN 217887267U CN 202221346902 U CN202221346902 U CN 202221346902U CN 217887267 U CN217887267 U CN 217887267U
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Abstract
The utility model discloses a device for continuously producing ammonium heptamolybdate, which comprises a dissolving kettle, a rough filtration filter, a transfer kettle, a precision filter, a cooling crystallization kettle, a centrifuge, a mother liquor ground tank and a mother liquor transfer tank; the dissolving kettle is connected in proper order the colating filter transfer cauldron precision filter the cooling crystallization cauldron centrifuge, centrifuge connects the mother liquor geosyncline, the mother liquor geosyncline is connected the mother liquor transfer groove, the mother liquor transfer groove is connected the dissolving kettle. The utility model has the advantages that: the replacement frequency of filtration process consumptive material is reduced, the consumptive material cost is reduced, convenience is brought for production operation, the labor cost is saved, continuous production is realized through continuous equipment arrangement, the time consumption of transportation is reduced, and the productivity of ammonium heptamolybdate is improved.
Description
Technical Field
The utility model relates to a molybdate production technical field especially relates to a device of ammonium heptamolybdate production.
Background
Ammonium heptamolybdate is mainly used in the industries and fields of chemical and petroleum catalysts, dyes, pigments, fertilizers and the like, and is one of important molybdates. Currently, ammonium tetramolybdate is generally adopted as a raw material in the production of ammonium heptamolybdate, a two-step method is adopted to prepare ammonium heptamolybdate, ammonium molybdate solution is added with nitric acid to obtain ammonium tetramolybdate, and the ammonium tetramolybdate and ammonia water are dissolved at the temperature of 60-80 ℃ to form ammonium tetramolybdate with the concentration of 1.42-1.48g/m 3 Filtering the ammonium molybdate solution while the solution is hot, cooling and crystallizing, centrifugally dewatering, drying and screening to obtain the finished ammonium heptamolybdate.
In the current ammonium heptamolybdate production process, 0.5h is dissolved, 1.0h is needed for filtration, 1.0h is needed for filtrate cooling crystallization, and 0.5h is needed for centrifugal dehydration. The time for producing a batch of ammonium heptamolybdate wet products is 3.0h-2.5h in total; the time is longer.
Furthermore, depending on the field of use of ammonium heptamolybdate, there is basically a high demand for the index of the solubility clarity of ammonium heptamolybdate. In order to ensure that the solubility clarity of ammonium heptamolybdate meets the index requirement, the whole system needs to maintain a higher cleanliness level, so equipment, facility, pipelines and the like in the process in the system need to be cleaned, especially a cooling crystallization kettle for discharging products. All the existing equipment share one washing water tank, and all the washing water finally converges in the elevated tank (especially, the cleaning water cleanliness of the mother liquor ground tank is poor, and the mother liquor ground tank is located underground, so that foreign insoluble floccules, dust and other impurities are easily introduced); after the washing water in the washing water tank circulates, some insoluble impurities exist, and when the water is used for washing the cooling crystallization kettle independently, the insoluble impurities are bound to be brought into the kettle, so that the insoluble impurities are brought into a product, and the product quality is influenced. If the good cleaning effect of the cooling crystallization kettle is ensured, the production line is required to stop production, and the whole system is cleaned.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve lies in: how to solve the problem of long production process time of the prior ammonium heptamolybdate.
The utility model discloses a following technical means realizes solving above-mentioned technical problem:
a device for continuously producing ammonium heptamolybdate comprises a dissolving kettle, a rough filtration filter, a transfer kettle, a precision filter, a cooling crystallization kettle, a centrifuge, a mother liquor ground tank and a mother liquor transfer tank; the dissolving kettle is connected in proper order the colating filter transfer cauldron precision filter the cooling crystallization cauldron centrifuge, centrifuge connects the mother liquor geosyncline, the mother liquor geosyncline is connected the mother liquor transfer groove, the mother liquor transfer groove is connected the dissolving kettle.
The utility model discloses dissolve in dissolving the cauldron, dissolve back solution and filter through the coarse filter and detach the visible impurity in dissolving the feed liquid and can not dissolve remain four ammonium molybdate, filter the feed liquid and change to the transfer cauldron and keep warm and store and prevent the crystallization, further filter impurity removal with the coarse filtrate of transfer cauldron through precision filter, the fine filtration feed liquid is changeed to cooling crystallization cauldron and is cooled off the crystallization. The utility model improves the filtering effect through twice filtering of rough filtering and fine filtering, and compared with the prior filter only, the filter has better filtering effect, reduces the replacement frequency of the consumable materials of the filtering process, reduces the cost of the consumable materials, brings convenience for the production operation and saves the labor cost; the utility model discloses a continuous equipment layout realizes continuous production, has reduced consuming time of transportation, has improved ammonium heptamolybdate's productivity.
Preferably, still include first washing basin, second washing basin, the play water end in first washing basin connects gradually the coarse filtration filter the transfer cauldron the precision filter the income water end in second washing basin is connected, the play water end in second washing basin connects gradually the cooling crystallization cauldron centrifuge the mother liquor geosyncline is connected the income water end in first washing basin.
In the utility model, the second water washing tank is water passing through the precision filter, has no insoluble impurities, and can realize the independent cleaning operation of the front-stage equipment and the rear-stage equipment of the cooling crystallization process; and has better cleaning effect. The production line is prevented from being stopped completely due to cleaning, and the production efficiency is prevented from being delayed.
Preferably, the first washing tank further comprises a diluted ammonia water pipeline.
Preferably, the filter membrane in the rough filter is filter paper, and the pore size of the filter membrane in the precision filter is less than 0.45 um.
The dissolved material liquid passes through the coarse-pore filter, filters out larger granular impurities, and the fine filter has a filter membrane aperture of 0.45um and below, further filters out impurities, and improves the filtering effect on the whole. Compared with the method that only the precision filter is relied on, the filtering speed is improved.
Preferably, the centrifugal machine is further provided with a dryer, a vibrating and screening machine and a metering and packaging machine, and the centrifugal machine is sequentially connected with the dryer, the vibrating and screening machine and the metering and packaging machine.
The wet ammonium heptamolybdate crystals from the centrifuge contain 2-10% of water, and are required to be dried and dehydrated, a drying system is used for drying, and then a vibrating screen machine is used for sieving to obtain a qualified product ammonium heptamolybdate, so that the continuous production is further improved, and the production efficiency is improved.
Preferably, the top of the dissolving kettle is connected with an ammonia water pipeline, a pure water pipeline, an ammonium tetramolybdate feeding pipeline, a first steam pipeline and a mother liquor transfer tank pipeline.
Preferably, the ammonia solution purification device further comprises an ammonia solution rough filtration pump, and the ammonia solution rough filtration pump is connected to a pipeline between the dissolving kettle and the rough filtration filter.
Preferably, the system also comprises an ammonia solution fine filtration pump, wherein the ammonia solution fine filtration pump is connected to a pipeline between the transfer kettle and the fine filter.
Preferably, the side of the transfer pot is connected with a second steam pipeline.
Preferably, the device also comprises a circulating cooling water device, and the cooling crystallization kettle is connected with the circulating cooling water device.
The utility model has the advantages that:
(1) The utility model discloses dissolve in dissolving the cauldron, dissolve back solution and filter through the coarse filter and detach the visible impurity in dissolving the feed liquid and can not dissolve remain four ammonium molybdate, filter the feed liquid and change to the transfer cauldron and keep warm and store and prevent the crystallization, further filter impurity removal with the coarse filtrate of transfer cauldron through precision filter, the fine filtration feed liquid is changeed to cooling crystallization cauldron and is cooled off the crystallization. The utility model improves the filtering effect through twice filtering of rough filtering and fine filtering, and compared with the prior filter only, the filter has better filtering effect, reduces the replacement frequency of the consumable materials of the filtering process, reduces the cost of the consumable materials, brings convenience for the production operation and saves the labor cost; the utility model realizes continuous production through continuous equipment arrangement, reduces the time consumption of transportation and improves the productivity of ammonium heptamolybdate;
(2) In the utility model, the second water washing tank is water passing through the precision filter, has no insoluble impurities, and can realize the independent cleaning operation of the front-stage equipment and the rear-stage equipment of the cooling crystallization process; and has better cleaning effect. The whole production line stop possibly caused by cleaning is avoided, and the production efficiency is delayed;
(3) The dissolved material liquid passes through the coarse-pore filter, filters out larger granular impurities, and the fine filter has a filter membrane aperture of 0.45um and below, further filters out impurities, and improves the filtering effect on the whole. Compared with the method which only relies on a precision filter, the filtering speed is improved;
(4) The wet ammonium heptamolybdate crystals from the centrifuge contain 2-10% of water, and are required to be dried and dehydrated, a drying system is used for drying, and then a vibrating screen machine is used for sieving to obtain a qualified product ammonium heptamolybdate, so that the continuous production is further improved, and the production efficiency is improved.
Drawings
FIG. 1 is a first schematic structural diagram of an apparatus for continuous production of ammonium heptamolybdate according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram II of an apparatus for continuous production of ammonium heptamolybdate according to an embodiment of the present invention;
reference numbers in the figures:
100. a device for continuously producing ammonium heptamolybdate; 101. a dissolving kettle; 102. coarse filtration and filtration; 103. a transfer kettle; 104. a precision filter; 105. cooling the crystallization kettle; 106. a centrifuge; 107. a mother liquor ground tank; 108. a mother liquor transfer tank; 109. a dryer; 110. a vibrating screen machine; 111. a metering packaging machine; 112. an ammonia water head tank; 113. an ammonia solution coarse filtration pump; 114. an ammonia solution fine filtration pump; 115. a mother liquor pump;
200. a cleaning device; 201. a first water washing tank; 202. a second water washing tank;
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1, a device 100 for continuously producing ammonium heptamolybdate comprises a dissolving kettle 101, a rough filtration filter 102, a transfer kettle 103, a precision filter 104, a cooling crystallization kettle 105, a centrifuge 106, a mother liquor ground tank 107, a mother liquor transfer tank 108, a dryer 109, a sieving machine 110 and a metering packaging machine 111; dissolving kettle 101 pipe connection in proper order rough filtration filter 102 transfer cauldron 103 precision filter 104 cooling crystallization kettle 105 centrifuge 106, the liquid phase that centrifuge 106 produced connects mother liquor geosyncline 107, and mother liquor geosyncline 107 connects mother liquor transfer groove 108, and the solid-state entering that centrifuge 106 produced in proper order drying-machine 109 the sieving machine 110 metering packaging machine 111.
Specifically, the ammonia water head tank 112 is connected to the top of the dissolving kettle 101 through an ammonia water pipeline, and the top of the dissolving kettle 101 is connected to a pure water pipeline, an ammonium tetramolybdate feeding pipeline, a first steam pipeline and a mother liquor transfer tank pipeline.
Dissolving: the dissolving kettle 101 mainly realizes the dissolving process, and aims to prepare ammonium molybdate solution from ammonium tetramolybdate solid. The specific operation process comprises the following steps: to 1m 3 600L of pure water and 260L of ammonia water are added into the reaction kettle; starting stirring, and heating steam to 60-70 ℃; about 500kg of ammonium tetramolybdate was gradually added and dissolved. After the dissolution is finished, the concentration of the feed liquid is 1.42-1.48g/m 3 The pH value is 6.3-6.5.
Coarse filtration: the feed liquid is introduced into the rough filtering filter through an ammonia solution rough filtering pump 113, the ammonia solution rough filtering pump 113 is connected with a pipeline between the dissolving kettle 101 and the rough filtering filter 102, and a filter membrane in the rough filtering filter is filter paper, so that visible impurities in the dissolved feed liquid and residual ammonium tetramolybdate which cannot be dissolved can be filtered and removed. The dissolved feed liquid passes through a coarse-pore filter, and larger granular impurities are filtered. The residual ammonium tetramolybdate which is generated after the coarse filtration and can not be dissolved can be reintroduced into the dissolving kettle 101 through a pipeline for recycling.
After coarse filtration, the feed liquid is transferred to 1m 3 And (5) a transfer kettle 103 for heat preservation and storage. The side surface of the transfer kettle 103 is connected with a second steam pipeline. The second steam pipeline is used for inputting steam to realize heat preservation.
Fine filtering: introducing coarse filtrate in the transfer kettle 103 into a precision filter 104 through an ammonia solution fine filtering pump 114, wherein the ammonia solution fine filtering pump 114 is connected to a pipeline between the transfer kettle 103 and the precision filter 104; the fine filter 104 is used for further filtering the impurities, and the aperture of the filter membrane in the embodiment is 0.45um and below; fine filtering liquid is transferred to 1m 3 And (5) cooling and crystallizing in a crystallizing kettle. Residual ammonium tetramolybdate which is generated after fine filtration and can not be dissolved can be reintroduced into the dissolving kettle 101 for recycling through a pipeline.
Cooling and crystallizing: the cooling crystallization kettle 105 is connected with the circulating cooling water device, the circulating cooling water is started, and the cooling is carried out to 20-30 ℃ to separate out ammonium heptamolybdate crystals.
The main reactions taking place in the process are as follows:
7(NH 4 ) 2 Mo 4 O 13 ·2H 2 O+10NH 4 OH→4(NH 4 ) 6 Mo 7 O 24 ·4H 2 O+3H 2 O
drying, screening and packaging: as shown in fig. 2, the wet ammonium heptamolybdate crystals from the centrifuge 106 contain 2-10% of water, and need to be dried and dehydrated, and then dried by the dryer 109, and then screened by the vibrating screen 110, so as to obtain the qualified product ammonium heptamolybdate, further improve the continuous production and improve the production efficiency.
As shown in fig. 1, the liquid phase generated by the centrifuge 106 enters the mother liquid sump 107, the mother liquid sump 107 is input into the mother liquid transfer tank 108 through the mother liquid pump 115, the mother liquid transfer tank 108 is a high-level tank, and the mother liquid transfer tank 108 reinjects the mother liquid into the dissolution kettle 101 for recycling.
The working process of the embodiment:
dissolving in a dissolving kettle 101, filtering the dissolved solution through a coarse filter 102 to remove visible impurities and residual ammonium tetramolybdate which cannot be dissolved in the dissolved solution, transferring the filtered solution to a transfer kettle 103 for heat preservation and storage to prevent crystallization, further filtering the coarse filtered solution of the transfer kettle 103 through a precision filter 104 to remove impurities, and transferring the fine filtered solution to a cooling crystallization kettle 105 for cooling and crystallization. In the embodiment, the filtering effect is improved by twice filtering through rough filtering and fine filtering, and compared with the existing method only having fine filtering, the method has the advantages that the filtering effect is better, the replacement frequency of consumable materials in the filtering process is reduced, the consumable material cost is reduced, convenience is brought to production operation, and the labor cost is saved; according to the embodiment, continuous production is realized through continuous equipment arrangement, the time consumption of transportation is reduced, and the productivity of ammonium heptamolybdate is improved.
Example two
As shown in fig. 1, the present embodiment further includes a cleaning device 200 based on the first embodiment, and the cleaning device 200 includes a first water washing tank 201 and a second water washing tank 202.
The water outlet end of the first water washing tank 201 is connected with the water inlet ends of the rough filtration filter 102, the transfer kettle 103, the precision filter 104 and the second water washing tank 202 in sequence; that is, the water in the first washing tank 201 may be introduced into the second washing tank 202 after the coarse filter 102, the relay tank 103, and the fine filter 104 are cleaned.
The water outlet end of the second water washing tank 202 is sequentially connected with the cooling crystallization kettle 105, the centrifuge 106, the mother liquid ground tank 107 and the water inlet end of the first water washing tank 201 through the mother liquid ground tank 107. That is, the water obtained by cleaning the coarse filtration filter 102, the relay tank 103, and the fine filter 104 in this order in the first water washing tank 201 enters the second water washing tank 202, and the second water washing tank 202 cleans the cooling crystallization tank 105 and the centrifuge 106 in this order.
In this embodiment, the second water washing tank 202 is water passing through a precision filter, has no insoluble impurities, and can realize separate cleaning operations of equipment at the front stage and the rear stage of the cooling crystallization process; and has better cleaning effect. The production line is prevented from being stopped completely due to cleaning, and the production efficiency is prevented from being delayed.
The first washing tank 201 further comprises a dilute ammonia pipeline.
In this embodiment, the first water washing tank 201 may also be connected to the dissolving kettle 101 to clean the dissolving kettle 101, and the cleaned water is mixed with the water for cleaning the coarse filter 102 and then enters the transfer kettle 103 and the fine filter 104.
Moreover, the dissolving kettle 101 and the cooling crystallization kettle 105 can be cleaned when not in use, the whole equipment does not need to be stopped for cleaning day by day, and if the dissolving kettle 101 works and the cooling crystallization kettle 105 does not work, the cleaning work of the cooling crystallization kettle 105 can be carried out; on the contrary, when the dissolution tank 101 is not in operation and the cooling crystallization tank 105 is in operation, the dissolution tank 101 can be cleaned. Production and cleaning are performed alternately, and the occupied time of production and cleaning is shortened.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A device for continuously producing ammonium heptamolybdate is characterized by comprising a dissolving kettle, a rough filtration filter, a transfer kettle, a precision filter, a cooling crystallization kettle, a centrifuge, a mother liquor ground tank and a mother liquor transfer tank; the dissolving kettle is connected in proper order the colating filter transfer cauldron precision filter the cooling crystallization cauldron centrifuge, centrifuge connects the mother liquor geosyncline, the mother liquor geosyncline is connected the mother liquor transfer groove, the mother liquor transfer groove is connected the dissolving kettle.
2. The device for continuously producing ammonium heptamolybdate according to claim 1, further comprising a first water washing tank and a second water washing tank, wherein the water outlet end of the first water washing tank is connected with the water inlet ends of the coarse filtration filter, the transfer kettle, the precision filter and the second water washing tank in sequence, and the water outlet end of the second water washing tank is connected with the water inlet end of the first water washing tank in sequence, and the water outlet end of the second water washing tank is connected with the cooling crystallization kettle, the centrifuge, the mother liquor ground tank and the mother liquor ground tank.
3. The apparatus of claim 2, wherein the first wash tank further comprises a dilute ammonia conduit.
4. The apparatus of claim 1, wherein the filter membrane in the coarse filter is filter paper, and the pore size of the filter membrane in the fine filter is less than 0.45 um.
5. The apparatus of claim 1, further comprising a dryer, a vibrating screen machine, and a metering and packaging machine, wherein the centrifuge is connected to the dryer, the vibrating screen machine, and the metering and packaging machine in sequence.
6. The device for continuously producing ammonium heptamolybdate according to claim 1, wherein the top of the dissolving kettle is connected with an ammonia water pipeline, a pure water pipeline, an ammonium tetramolybdate feeding pipeline, a first steam pipeline and a mother liquor transfer tank pipeline.
7. The apparatus of claim 1, further comprising an ammonia solution coarse filtration pump connected to a pipeline between the dissolution kettle and the coarse filtration filter.
8. The apparatus of claim 1, further comprising an ammonia solution fine filtration pump, wherein the ammonia solution fine filtration pump is connected to a pipeline between the intermediate kettle and the fine filter.
9. The apparatus for continuously producing ammonium heptamolybdate according to claim 1, wherein the side of the intermediate kettle is connected to a second steam pipe.
10. The apparatus for continuously producing ammonium heptamolybdate according to claim 1, further comprising a circulating cooling water device, wherein the cooling crystallization kettle is connected with the circulating cooling water device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221346902.7U CN217887267U (en) | 2022-05-31 | 2022-05-31 | Ammonium heptamolybdate continuous production device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221346902.7U CN217887267U (en) | 2022-05-31 | 2022-05-31 | Ammonium heptamolybdate continuous production device |
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| CN217887267U true CN217887267U (en) | 2022-11-25 |
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| CN202221346902.7U Active CN217887267U (en) | 2022-05-31 | 2022-05-31 | Ammonium heptamolybdate continuous production device |
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