CN216677293U - Vacuum rotary table filter - Google Patents
Vacuum rotary table filter Download PDFInfo
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- CN216677293U CN216677293U CN202122983327.3U CN202122983327U CN216677293U CN 216677293 U CN216677293 U CN 216677293U CN 202122983327 U CN202122983327 U CN 202122983327U CN 216677293 U CN216677293 U CN 216677293U
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The utility model discloses a vacuum rotary table filter, which belongs to the technical field of titanium dioxide production, and is characterized in that one or more scrapers and spray pipes matched with the scrapers are added to wash and filter the heptahydrate crystal for multiple layers one by one in a progressive manner, thereby improving the filtering effect, reducing the titanium content carried in ferrous sulfate and further improving the titanium yield; the scraper overturns and scrapes ferrous iron tightly attached to the filter cloth in a negative pressure state, so that acidic materials on the surface of the filter cloth are scraped, the corrosion degree of the filter cloth is reduced, and the service life of the filter cloth is prolonged; by arranging the compressed air back-blowing component and adopting a compressed air back-blowing method, the ferrous sulfate blocked in the filter holes of the filter cloth is dredged, and continuous high-efficiency filtration is realized. The service life of the filter cloth is prolonged, so that the filtering efficiency is improved, the titanium content carried in ferrous sulfate is reduced, the titanium yield is improved, and the processing capacity is improved.
Description
Technical Field
The utility model belongs to the technical field of titanium dioxide production, and particularly relates to a vacuum rotary table filter for filtering ferrous iron in titanium liquid in titanium dioxide production and a filtering process.
Background
In modern mass production, continuous and stable process operation is always one of the basic requirements of producers, so the research and improvement of continuous vacuum filters in the industry always keep higher attention. The continuous vacuum filter can be classified into an outer filtering surface rotary drum vacuum filter, a disc vacuum filter, a rotary table vacuum filter, a skip bucket vacuum filter, a belt vacuum filter, etc. The rotary vacuum filter has the advantages of simple structure, good washing effect, separation of washing liquid and filtrate, large treatment capacity of a single filter for quickly dewatered slurry and the like, so the rotary vacuum filter is widely applied to the titanium dioxide production industry.
In the production process of titanium white by a sulfuric acid method, the concentration of titanium liquid and the iron-titanium ratio need to be strictly controlled, so that the titanium liquid needs to be crystallized, ferrous sulfate heptahydrate crystals need to be separated, and the separation of the titanium liquid and the ferrous sulfate crystals needs to be realized through rotary table vacuum filtration. The filtering quality of the rotary vacuum filter directly influences the residual titanium content in the ferrous sulfate, thereby influencing the titanium yield. In the prior art, the technology of the rotary table vacuum filter is relatively mature, but the problems of instability, short service life of filter cloth, frequent replacement and the like exist in the actual production process of titanium dioxide, so that how to improve the filtering effect of the rotary table vacuum filter and improve the service life of the filter cloth is how to improve the titanium yield in the production process of titanium dioxide by a sulfuric acid method is always an important research direction in the industry.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, the utility model aims to provide a vacuum rotary table filter for filtering ferrous iron in titanium liquid in the production of titanium dioxide.
The technical scheme adopted by the utility model is as follows:
a vacuum rotary table filter comprises a filter rotary table, wherein a feed inlet, a discharge screw, a recovery pipeline and a washing pipeline are arranged on the filter rotary table, a plurality of scrapers are also arranged above the filter rotary table and along the radius direction of the filter disc, the scrapers are arranged between the feed inlet and the discharge screw, and spray pipes matched with the scrapers are arranged at the parallel opposite positions of the scrapers; the filter cloth is further included, and a compressed air blowback assembly is arranged on one corresponding side of the filter cloth.
By adopting the technical scheme, one or more scrapers and spray pipes matched with the scrapers are added, and the ferrous heptahydrate crystals are washed, filtered and discharged in a progressive manner one by one for multiple layers, so that the filtering effect is improved, the titanium content carried in ferrous sulfate is reduced, and the titanium yield is further improved;
preferably, the scraper is a scraping screw. After the scraping screw is additionally arranged, ferrous iron tightly attached to the filter cloth in a negative pressure state is turned and scraped, and then the filter cloth is washed, so that the ferrous iron rich in titanyl sulfate acidic materials cannot be tightly adhered to the surface of the filter cloth before water washing, the acidic materials carried in the ferrous iron are easier to remove after the water washing, the corrosion degree of the filter cloth is reduced, and the service life of the filter cloth is prolonged.
Preferably, the compressed air blowback assembly comprises a support frame, a compressed air pump is fixedly arranged on the support frame, an air inlet of the compressed air pump is provided with an air filter cover, an air outlet of the compressed air pump is connected with a plurality of blowing pipes through hoses, and the blowing pipes are provided with compressed air nozzles. By arranging the compressed air back-blowing component and adopting a compressed air back-blowing method, the ferrous sulfate blocked in the filter holes of the filter cloth is dredged, and continuous high-efficiency filtration is realized. The service life of the filter cloth is prolonged, so that the filtering efficiency is improved, the titanium content carried in ferrous sulfate is reduced, the titanium yield is improved, and the processing capacity is improved.
Preferably, the compressed air nozzle is oriented perpendicular to the plane direction of the filter cloth. Ensures that the compressed air nozzle can directly flush out ferrous sulfate in the filter holes in the filter cloth.
Preferably, the back blowing pressure of the compressed air provided by the compressed air pump is 0.02-0.05 Mpa.
A vacuum turntable filtration process, comprising:
step 1: introducing the crystallized slurry and sand filtering water into a crystallized slurry distributing hopper to form mixed slurry;
step 2: introducing the mixed slurry into a rotary table vacuum filter from a feed inlet, and after the filtered material enters a filtering area, rapidly realizing solid-liquid separation by using a negative pressure system provided by a water ring vacuum pump to form a filter cake and filtrate;
and step 3: filtering sand water is introduced into the vacuum filter to wash the filter cake for three times, ferrous sulfate crystals contained in the filter cake are separated, and the separated ferrous sulfate crystals enter a ferrous production workshop;
and 4, step 4: and (3) introducing the filtrate at the separation part of the vacuum filter into the separator, flowing into a filtrate heating tank through a liquid seal pipe, heating the filtrate to 30-40 ℃, pumping the filtrate to a refined titanium liquid storage tank, and then performing a double-effect concentration process.
Preferably, the filtered materials are filtered by washing the filter cloth, a large amount of ferrous sulfate can be attached to the surface of the filter cloth to block filter holes of the filter cloth, so that when the mixed slurry is introduced into a rotary table vacuum filter for filtering, compressed air is adopted to carry out back flushing on the filter cloth to dredge the ferrous sulfate blocked in the filter holes of the filter cloth, and continuous high-efficiency filtering is realized.
Preferably, the back blowing pressure of the compressed air is 0.02-0.05 MPa.
Preferably, in addition, because ferrous sulfate crystals are themselves soluble in water, it is inevitable to cause some of the crystals to re-dissolve when rinsed with water. In order to reduce the re-dissolution as much as possible and wash the crystals as clean as possible, the washing can be divided into three times, the first washing is carried out by using water obtained by washing the last batch of crystals for the second time, and the washing liquid can be merged into the filtered titanium liquid under the condition of not influencing the indexes of the titanium liquid; the second washing is performed by using sand filtration water with the temperature less than 20 ℃, and the washing liquid is reserved for the first washing of the next batch of crystals, so that the influence on the concentration of the titanium liquid is reduced while the ferrous iron is separated, and the dissolving amount of the ferrous iron in the titanium liquid is reduced.
Preferably, the automatic interlocking control is adopted to filter the feeding quantity and the washing water flow, and the washing water flow in the step 3 is 0.3-3.5m3H is used as the reference value. In the prior art, the control of the washing water amount is still inaccurate, when the washing water amount is high, the content of residual titanium in ferrous iron is reduced, the titanium yield is improved, but the concentration of titanium liquid is reduced, and the increase is causedThe production load of concentration and concentration in the subsequent process is reduced; and secondly, the washing water amount is high, the content of iron dissolved in the titanium liquid is increased, the pressure for removing iron at the back is increased, after the optimized technical scheme is adopted, the filtering feeding flow and the washing water flow are subjected to linkage control according to a proportion, the feeding flow is adjusted by an operator according to the material level conditions of the previous and subsequent processes, the washing water consumption is reduced, the quality of ferrous iron and the quality of the titanium liquid are ensured to be qualified, the quality fluctuation of the titanium liquid caused by manually regulating and controlling the water amount is reduced, and the qualified index of the filtrate of each batch of the rotary table is ensured.
Preferably, the separator is connected with a demister, a water ring vacuum pump and a sealed water recovery tank in sequence.
Preferably, the filtrate heating tank is connected with a hot water circulating tank, sand filter water is introduced into the hot water circulating tank, and steam is introduced for heating.
In summary, due to the adoption of the technical scheme, the utility model has the beneficial effects that:
1) through adding one or more scrapers and spray pipes adapted to the scrapers, the ferrous heptahydrate crystal is washed, filtered and removed gradually and gradually in multiple layers for multiple times, so that the filtering effect is improved, the titanium content carried in ferrous sulfate is reduced, and the titanium yield is improved.
2) The scraper is a scraping screw, ferrous iron tightly attached to the filter cloth in a negative pressure state is turned and scraped after the scraping screw is newly added, and then washing is carried out, so that the ferrous iron rich in titanyl sulfate acidic materials cannot be tightly adhered to the surface of the filter cloth before water washing, after washing, the acidic materials carried in the ferrous iron are easier to remove, the corrosion degree of the filter cloth is reduced, and the service life of the filter cloth is prolonged.
3) By arranging the compressed air back-blowing component and adopting a compressed air back-blowing method, the ferrous sulfate blocked in the filter holes of the filter cloth is dredged, and continuous high-efficiency filtration is realized. The service life of the filter cloth is prolonged, so that the filtering efficiency is improved, the titanium content carried in ferrous sulfate is reduced, the titanium yield is improved, and the processing capacity is improved.
Drawings
The utility model will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic flow diagram of a vacuum turret filtration process according to the present invention;
FIG. 2 is a schematic top view of a rotary vacuum filter according to the present invention;
reference numerals
1-discharge screw, 2-feed inlet, 3-recovery pipeline, 4-scraper, 5-washing pipeline, 6-spray pipe and 7-escalator.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of embodiments of the present application, generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually placed in when used, and are only used for convenience of description and simplification of the description, but do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
The present invention will be described in detail with reference to fig. 1 to 2.
Example 1:
a vacuum turntable filtration process, comprising:
step 1: introducing the crystallized slurry and sand filtering water into a crystallized slurry distributing hopper to form mixed slurry;
step 2: introducing the mixed slurry into a rotary table vacuum filter from a feed inlet 2, after the filtered material enters a filtering area, rapidly realizing solid-liquid separation by a negative pressure system provided by a water ring vacuum pump with the vacuum degree of-0.02 to-0.06 MPa through filter cloth to form a filter cake and filtrate;
and step 3: filtering sand water is introduced into the vacuum filter to wash the filter cake for three times, ferrous sulfate crystals contained in the filter cake are separated, and the separated ferrous sulfate crystals enter a ferrous production workshop;
and 4, step 4: and (3) introducing the filtrate at the separation part of the vacuum filter into a separator, separating the filtrate through a gas-liquid separator under vacuum suction, then flowing into a filtrate heating tank through a liquid seal pipe, heating the filtrate to 30-40 ℃, pumping the filtrate to a refined titanium liquid storage tank, and then performing a double-effect concentration process.
In this embodiment, the filter material is filtered through washing the filter cloth, and a large amount of ferrous sulfate can be attached to the filter cloth surface, blocks up the filter cloth filtration pore, so when mixed ground paste lets in to revolving stage vacuum filter and filters, adopt compressed air to carry out the blowback to the filter cloth, dredge the ferrous sulfate that blocks up in the filter cloth filtration pore, realize continuous high efficiency and filter.
In this embodiment, the pressure of the compressed air is 0.02-0.05 MPa.
In the embodiment, because the ferrous sulfate crystals are soluble in water, the ferrous sulfate crystals inevitably cause partial re-dissolution of the crystals when washed with water. In order to reduce the re-dissolution as much as possible and wash the crystals as clean as possible, the washing can be divided into three times, the first washing is carried out by using water obtained by washing the last batch of crystals for the second time, and the washing liquid can be merged into the filtered titanium liquid under the condition of not influencing the indexes of the titanium liquid; the second washing is performed by using sand filtration water with the temperature less than 20 ℃, and the washing liquid is reserved for the first washing of the next batch of crystals.
In the prior art, the control on the washing water consumption is still inaccurate, when the washing water consumption is high, the content of residual titanium in ferrous iron is reduced, the titanium yield is improved, the concentration of titanium liquid is reduced, and the production load of concentration and concentration in the subsequent process is increased; secondly, the washing water amount is high, the content of iron dissolved in the titanium liquid is increased, the pressure for removing iron later is increased, in the embodiment, the automatic interlocking control is adopted to filter the feeding amount and the washing water flow, and the washing water flow in the step 3 is 0.3-3.5m3The feed flow is adjusted by operators according to the material level conditions of the front and rear working procedures, and the proportion value is currently 120: when the production demand increases, the feed rate increases, e.g. 60m3The flow rate of the washing water is automatically adjusted to 0.5m3And h, performing chain control on the filtering feeding flow and the washing water flow in proportion, wherein the feeding flow is adjusted by an operator according to the material level conditions of the front and the back working procedures, so that the quality of ferrous iron and the quality of titanium liquid are qualified while the washing water consumption is reduced, the quality fluctuation of the titanium liquid caused by manually regulating and controlling the water quantity is reduced, and the qualified index of the filtrate of each batch of the rotary table is ensured.
In this embodiment, for the optimization study of the washing water flow parameters, four different experimental groups of washing water flow and a control group experiment of the original filtering mode are provided, and the feeding flow of a single turntable in the production process is 60m3The flow rate of the feed of the crystallization slurry is set to 60m3Specific experimental data are given in table 1 below:
table 1:
it can be seen that the amount of washing water used is about 0.5m3Discharge rotary table for discharging in hourThe concentration of the filtrate is more than or equal to 165g/L, the content of residual ferrous titanium in the discharging area after filtration is 0.46 percent at least, and the filtration effect realized by the optimized washing water dosage is obviously reduced from 0.63 percent to 0.46 percent in the aspect of the residual ferrous titanium rate compared with the filtration effect of the original filtration mode, thereby obtaining obvious beneficial effect.
Preferably, the separator is connected with a demister, a water ring vacuum pump and a sealed water recovery tank in sequence.
Preferably, the filtrate heating tank is connected with a hot water circulation tank, and sand filtering water is introduced into the hot water circulation tank and steam is introduced for heating.
Example 2:
the utility model provides a vacuum rotary table filter, is including filtering the carousel, filter and be provided with feed inlet 2, ejection of compact spiral 1, recovery pipeline 3, washing pipeline 5 and people's escalator 7 on the carousel, still set up the several in the radius direction of filtering the carousel top and following the filter disc and scrape glassware 4, scrape glassware 4 and set up between feed inlet 2 and ejection of compact spiral 1, be provided with and scrape the shower 6 that glassware 4 suited in scraping 4 parallel relative positions of glassware. Through increasing one or more than one scraper 4 and shower 6 that suits with it, the ferrous layer thickness is at 5-6cm during the filtration, and titanium content is high in the ferrous bottom, scrapes the upper clear ferrous of washing off through scraper 4, then washs the filtration to the ferrous lower floor to improve the filter effect, reduced the titanium content of smuggleing secretly in the ferrous sulfate, and then improved the titanium yield. In the present invention, the number of the scrapers 4 and the shower pipes 6 is preferably set to be adjusted according to the feed amount. The distance between the spray pipe 6 and the filter cake is preferably 3-10 cm, and more preferably 4-9 cm.
The vacuum rotary table filter further comprises a filter cloth, a compressed air reverse blowing assembly (not shown in the figure) is arranged on one corresponding side of the filter cloth, the compressed air reverse blowing assembly comprises a support frame, a compressed air pump is fixedly arranged on the support frame, an air inlet of the compressed air pump is provided with an air filtering cover, an air outlet of the compressed air pump is connected with a plurality of purging pipes through hoses, compressed air nozzles are arranged on the purging pipes, and ferrous sulfate blocked in filter holes of the filter cloth is dredged by setting the compressed air reverse blowing assembly and adopting a compressed air reverse blowing method, so that continuous high-efficiency filtration is realized. The service life of the filter cloth is prolonged, so that the filtering efficiency is improved, the titanium content carried in ferrous sulfate is reduced, the titanium yield is improved, and the processing capacity is improved.
In this embodiment, the compressed air nozzle is oriented perpendicular to the plane direction of the filter cloth. Ensures that the compressed air nozzle can directly flush out ferrous sulfate in the filter holes in the filter cloth.
In this embodiment, the scraper 4 is parallel to the spray pipe 6, and in other embodiments, the spray pipe 6 may be arranged in a direction that forms an included angle with the direction of the scraper 4, so as to ensure the spraying effect and reduce the concentration of the filtrate in the upper filter cake.
The scraper 4 is preferably a scraper or a discharge screw, more preferably a discharge screw.
The mixed slurry is not particularly limited in the present invention, and may be a mixed slurry filtered by a conventional rotary vacuum filter well known to those skilled in the art, and the present invention is preferably a titanium liquid containing ferrous sulfate heptahydrate crystals; the pressure of the vacuum is not particularly limited in the utility model, and the numerical value of the vacuum pressure set by the rotary table vacuum filter well known to the person skilled in the art can be used; the conditions for suction filtration are not particularly limited in the present invention, and those known to those skilled in the art may be used; the feeding amount of the mixed slurry is not particularly limited in the present invention, and the rated feeding amount of the rotary vacuum filter known to those skilled in the art may be used, and in the present invention, the number of the scraper 4 and the shower pipe 6 is preferably adjusted according to the feeding amount, and the distance between the scraper 4 and the filter disc is 25% to 75% of the thickness of the filter cake.
The vacuum rotary table filter and the filtering process provided by the utility model have the following economic indexes in practical application:
1. compared with the traditional single unloading rotary table filter, the treatment efficiency of the novel rotary table filtering device is improved by 36%, and 3 novel rotary table filters can meet the requirement of producing 15 ten thousand tons of titanium dioxide annually and realize a state of one for two, one for one, according to the calculation of producing 15 ten thousand tons of titanium dioxide annually, and meanwhile, the filtering area is 22m 2;
2. the profit of the novel rotary table filtering device on the aspect of automatic improvement of washing water is about 15.5 ten thousand yuan per year; the cost of 52560 x 0.39+4000 x 9 x 12/10000 ═ 45.25 ten thousand yuan can be reduced every year when the filtration efficiency is improved and the water resource is saved; the cost can be reduced by 220 x 22 x 30 x 12 x 0.6/10000 to 104.544 ten thousand yuan each year by reducing one turntable filter from being opened normally, and the annual accumulated income creating benefit is about 149.794 ten thousand yuan.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. A vacuum rotary table filter is characterized by comprising a filter rotary table, wherein a feed inlet (2), a discharge spiral (1), a recovery pipeline (3) and a washing pipeline (5) are arranged on the filter rotary table, a plurality of scrapers (4) are also arranged above the filter rotary table and along the radius direction of the filter rotary table, the scrapers (4) are arranged between the feed inlet (2) and the discharge spiral (1), and spray pipes (6) which are adaptive to the scrapers (4) are arranged at the parallel opposite positions of the scrapers (4); the filter cloth is further included, and a compressed air blowback assembly is arranged on one corresponding side of the filter cloth.
2. The vacuum rotary table filter according to claim 1, wherein the compressed air reverse blowing assembly comprises a support frame, a compressed air pump is fixedly arranged on the support frame, an air inlet of the compressed air pump is provided with an air filter cover, an air outlet of the compressed air pump is connected with a plurality of purging pipes through hoses, and compressed air nozzles are arranged on the purging pipes.
3. A vacuum turntable filter according to claim 1, wherein the scraper (4) is a scraper screw.
4. A vacuum turntable filter according to claim 2, wherein the compressed air nozzles are oriented perpendicular to the plane of the filter cloth.
5. The vacuum rotary table filter according to claim 2, wherein the compressed air pump is a compressed air pump having a pressure of 0.02 to 0.05 Mpa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122983327.3U CN216677293U (en) | 2021-11-30 | 2021-11-30 | Vacuum rotary table filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122983327.3U CN216677293U (en) | 2021-11-30 | 2021-11-30 | Vacuum rotary table filter |
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| CN216677293U true CN216677293U (en) | 2022-06-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115054978A (en) * | 2022-08-11 | 2022-09-16 | 江苏新宏大集团有限公司 | Filter is used in phosphoric acid production |
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2021
- 2021-11-30 CN CN202122983327.3U patent/CN216677293U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115054978A (en) * | 2022-08-11 | 2022-09-16 | 江苏新宏大集团有限公司 | Filter is used in phosphoric acid production |
| CN115054978B (en) * | 2022-08-11 | 2022-10-25 | 江苏新宏大集团有限公司 | Filter is used in phosphoric acid production |
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