CN113044880B - Production process for increasing whiteness of titanium dioxide - Google Patents
Production process for increasing whiteness of titanium dioxide Download PDFInfo
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- CN113044880B CN113044880B CN202110307144.1A CN202110307144A CN113044880B CN 113044880 B CN113044880 B CN 113044880B CN 202110307144 A CN202110307144 A CN 202110307144A CN 113044880 B CN113044880 B CN 113044880B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
- C01G23/047—Titanium dioxide
- C01G23/053—Producing by wet processes, e.g. hydrolysing titanium salts
- C01G23/0532—Producing by wet processes, e.g. hydrolysing titanium salts by hydrolysing sulfate-containing salts
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D9/0004—Crystallisation cooling by heat exchange
- B01D9/0013—Crystallisation cooling by heat exchange by indirect heat exchange
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- C01G23/008—Titanium- and titanyl sulfate
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- C—CHEMISTRY; METALLURGY
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- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/14—Sulfates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The invention relates to the technical field of titanium dioxide processing, and discloses a production process for increasing whiteness of titanium dioxide. According to the invention, the first treatment disc and the second treatment disc are arranged on the upper side of the liquid storage tank, the solution in the liquid storage tank can be conveyed to a high position through the circulating pump, then the solution can sequentially flow through the first treatment disc and the second treatment disc, and the first treatment disc and the second treatment plate are both communicated with the circulating cooling water, so that the flowing solution can be cooled.
Description
Technical Field
The invention relates to the technical field of titanium dioxide processing, in particular to a production process for increasing the whiteness of titanium dioxide.
Background
Titanium dioxide is a white pigment with excellent performance, and is widely applied to the industries of coatings, plastics, papermaking, printing ink, chemical fibers, rubber, cosmetics and the like. The whiteness of the titanium dioxide has a plurality of influence factors, such as influence of mineral sources, equipment and key technologies. Usually as the titanium dioxide production technology of sulfuric acid process, a great part is the process of removing impurities, the content and the kind of trace harmful impurities are key factors influencing the whiteness of the product, in the production process of the titanium dioxide of sulfuric acid process, the cooling crystallization method is usually used to remove ferrous sulfate in the titanium solution, and the principle is as follows: firstly, the solubility of ferrous sulfate is reduced, when the solubility is lower than the actual concentration in the solution, the solution becomes supersaturated, and the excessive part of the solution can be crystallized and precipitated from the titanium solution, thereby achieving the purpose of removing a large amount of ferrous sulfate.
In the crystallization process, the solution needs to be continuously stirred, but the stirring speed has great influence on the particle size of the crystal, if the stirring speed is higher, the crystal particles are too fine, and the fine crystal not only makes the filtration of the solution more troublesome, but also easily causes the problem of incomplete filtration, thereby influencing the whiteness of the product; however, if the stirring speed is too slow, the production efficiency will be affected, and the stirring speed is too slow, which is not suitable for economic reasons.
In view of the above, the invention provides a production process for increasing the whiteness of titanium dioxide, so as to solve at least one problem in the prior art.
Disclosure of Invention
The invention provides a production process for increasing whiteness of titanium dioxide, which has the beneficial effect of effectively improving production efficiency on the premise of not influencing impurity cleaning, and solves the problems that in the background art, if the stirring speed is higher, crystal particles are too fine, and the fine crystals not only cause the filtration of a solution to be more troublesome, but also easily cause the problem of incomplete filtration, so that the whiteness of a product is influenced; however, if the stirring speed is too slow, the production efficiency is affected.
The invention provides the following technical scheme: a production process for increasing whiteness of titanium dioxide comprises the following steps:
s1, raw material treatment: adding ilmenite into a grinder for grinding, performing coarse-fine separation on the ilmenite through a winnowing machine after grinding, returning unqualified ilmenite to the grinder for reprocessing, and conveying qualified ilmenite powder into a storage bin for storage;
s2, acidolysis treatment: adding the powder prepared in the step S1 into an acidolysis tank, adding sulfuric acid with the concentration of 91-95% into the acidolysis tank, uniformly stirring, introducing steam into the acidolysis tank, carrying out acidolysis reaction on the material under the action of the steam, standing for a period of time after the acidolysis reaction, adding water into the acidolysis tank, leaching and extracting the material by water, and obtaining a titanium solution after the extraction is finished;
s3, settling treatment: conveying the titanium liquid into a sedimentation tank, adding a flocculating agent into the tank, and precipitating insoluble impurities and colloidal particles in the titanium liquid through the flocculating agent;
s4, cooling and crystallizing, namely adding the titanium liquid into cooling and impurity removing equipment to remove iron in the titanium liquid, performing sedimentation treatment to obtain a large amount of soluble impurities which mainly exist in a ferrous sulfate form, cooling the titanium liquid by using a cooling medium to ensure that the ferrous sulfate in the solution is in a saturated state, and then separating out the ferrous sulfate along with the reduction of the temperature;
s5, subsequent processing: after the treatment of soluble impurities and insoluble impurities in the titanium liquid is finished, adding the titanium liquid into a hydrolysis tank for hydrolysis treatment, obtaining hydrated titanium dioxide after the hydrolysis treatment is finished, then washing and bleaching the hydrated titanium dioxide, finally calcining the hydrated titanium dioxide, and crushing the calcined material after the treatment is finished, thus obtaining the titanium dioxide.
The invention also provides equipment for increasing the whiteness of the titanium dioxide, which comprises a shell and a liquid storage tank, wherein the shell is cylindrical, the liquid storage tank is positioned at the lower side of the shell, a circulating pump is arranged in the liquid storage tank, a liquid outlet pipe is arranged at the upper end of the liquid storage tank, and the bottom end of the liquid outlet pipe is communicated with a liquid outlet of the circulating pump;
be equipped with a plurality of circulative cooling subassembly on the drain pipe, just circulative cooling subassembly includes first processing dish and second processing dish, first processing dish with the second processing dish all is the toper form, just first processing dish with each other is the mirror image setting between the second processing dish, the outside of first processing dish is equipped with the first runner of a plurality of, the second processing dish is located the downside of first processing dish, just the inboard of second processing dish is equipped with a plurality of second runner, the upside of second processing dish is equipped with solid fixed ring, just gu fixed ring with drain pipe fixed connection, gu fixed ring still through first spring with second processing dish elastic connection, the downside of second processing dish is equipped with the water-collecting plate, just the water-collecting plate cup joints on the drain pipe, the water-collecting plate through first connecting rod with second processing dish fixed connection, just the downside of water-collecting plate is equipped with the first hole of draining of a plurality of, the inboard of shell is equipped with a plurality of impurity processing mechanism, just impurity processing mechanism's position and quantity with first runner one-to-one quantity.
Preferably, the impurity processing mechanism includes a fixing base, a material collecting tank, a support frame and a guide plate, a storage tank is arranged at the upper end of the fixing base, a drain pipe is arranged at the lower side of the fixing base, one end of the fixing base is connected with the shell in a vertical sliding mode through a sliding groove, the fixing base is further connected with the shell in an elastic mode through a support spring, the support frame is located at the upper side of the fixing base, the bottom end of the support frame is fixedly connected with the fixing base, the guide plate is located at the upper side of the support frame, one end of the guide plate is connected with the support frame in a rotating mode through a rotating shaft, a filtering pore plate is arranged at the upper side of the guide plate and is in a triangular shape, the filtering pore plate is fixedly connected with the guide plate through a second connecting rod, the material collecting tank is located at the upper side of the fixing base, and one end of the material collecting tank is inserted into the shell.
Preferably, the top of the material collecting tank is of an open structure, and the front end of the material collecting tank is provided with an inclined plane.
Preferably, the outer end of the second runner is provided with a top block, the top block is in a right-angled triangle shape, one end of the top block is provided with a connecting column, the connecting column is inserted into the second processing disc, and the end part of the connecting column is elastically connected with the second processing disc through a second spring.
Preferably, the guide plate is close to the one end downside of second processing dish is equipped with spacing arch, just spacing bellied bottom with the kicking block is inconsistent.
Preferably, the lower extreme of support frame is equipped with the stopper, just the stopper is the L shape, the one end of stopper with support frame fixed connection, just the other end of stopper with the guide plate offsets.
Preferably, the lower end of the second processing tray is provided with a plurality of second drain holes, and the second drain holes are communicated with the second flow channel.
Preferably, the upper end of the liquid storage tank is provided with a flow guide disc, the flow guide disc is in a conical shape, and the flow guide disc is fixed on the liquid outlet pipe.
In summary, compared with the prior art, the invention has the following beneficial effects and advantages:
1. this increase production technology of titanium white powder whiteness degree, have first processing dish through the setting, the second is handled the dish, the shell of circulating pump and reservoir, first processing dish and second are handled the dish and are set up the upside at the reservoir, can carry the eminence with the solution in the reservoir through the circulating pump, then the solution can flow through first processing dish and second in proper order and handle the dish, first processing dish and second are handled the board and are all put through there is recirculated cooling water, can cool off the solution that flows through, this technical scheme has adopted circulation flow's mode to cool off the solution, compare with traditional stirring and cooling, not only cooling efficiency is high, and it is less to the particle size influence of crystal, make the filtration in later stage become more convenient, the effectual processingquality who improves the product.
2. This increase titanium white powder whiteness's production technology comes to handle the crystal that appears through setting up impurity treatment mechanism, and solution is at the in-process that flows, can be earlier through guide plate and filtration orifice plate then fall the second again and handle the dish, can filter crystal impurity through filtering the orifice plate, and crystal impurity after the filtration can remain on filtering the orifice plate, along with the increase of weight, filters the orifice plate and can overturn automatically and pour crystal impurity into to the material collecting vat, and is more convenient.
3. This increase titanium white powder whiteness's production technology, outside through handling the dish at the second sets up a plurality of kicking block, the kicking block is handled a horizontal sliding connection at the effect of spliced pole and second, because the kicking block is right triangle-shaped, when the guide plate is when the downstream, can promote the kicking block to one side earlier, when the guide plate downstream, handle the dish under the effect of second, its one end that is close to the second and handles the dish can upwards perk gradually, at this moment, the focus of guide plate and this subassembly of filtration orifice plate can change, when the guide plate overturns certain angle, its power of exerting force to the kicking block can be less than the elasticity that the second spring provided, the kicking block can pop out under the effect of second spring, promote the guide plate from the horizontal direction, make its upset, can effectually promote the guide plate to the assigned position.
Drawings
FIG. 1 is a schematic view of the present invention.
FIG. 2 is a cross-sectional view of a hydronic cooling assembly according to the present invention.
Fig. 3 is a schematic structural diagram at a in fig. 2 of the present invention.
FIG. 4 is a sectional view of a foreign substance disposal mechanism according to the present invention.
In the figure: 1. a housing; 2. a liquid storage tank; 3. a circulation pump; 4. a liquid outlet pipe; 5. a first processing tray; 6. a second processing tray; 7. a first flow passage; 8. a second flow passage; 9. a fixing ring; 10. a first spring; 11. a water collection plate; 12. a first connecting rod; 13. a first drain hole; 14. a fixed seat; 15. a material collecting tank; 16. a support frame; 17. a baffle; 1701. a limiting bulge; 18. a storage tank; 19. a drain pipe; 20. a support spring; 21. a filter orifice plate; 22. a second connecting rod; 23. a top block; 24. connecting columns; 25. a second spring; 26. a limiting block; 27. a second drain hole; 28. and a flow guide disc.
Detailed Description
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Example 1
Referring to fig. 1-4, this embodiment discloses a production process for increasing whiteness of titanium dioxide, including the following steps:
s1, raw material treatment: adding ilmenite into a grinder for grinding, performing coarse-fine separation on the ilmenite through a winnowing machine after grinding, returning unqualified ilmenite to the grinder for reprocessing, and conveying qualified ilmenite powder into a storage bin for storage;
s2, acidolysis treatment: adding the powder prepared in the step S1 into an acidolysis tank, adding sulfuric acid with the concentration of 91-95% into the acidolysis tank, uniformly stirring, introducing steam into the acidolysis tank, carrying out acidolysis reaction on the material under the action of the steam, standing for a period of time after the acidolysis reaction, adding water into the acidolysis tank, leaching and extracting the material by water, and obtaining a titanium solution after the extraction is finished;
s3, settling treatment: conveying the titanium liquid into a sedimentation tank, adding a flocculating agent into the tank, and precipitating insoluble impurities and colloidal particles in the titanium liquid through the flocculating agent;
s4, cooling and crystallizing, namely adding the titanium liquid into cooling and impurity removing equipment to remove iron in the titanium liquid, performing sedimentation treatment to obtain a large amount of soluble impurities which mainly exist in a ferrous sulfate form, cooling the titanium liquid by using a cooling medium to ensure that the ferrous sulfate in the solution is in a saturated state, and then separating out the ferrous sulfate along with the reduction of the temperature;
s5, subsequent processing: after the treatment of soluble impurities and insoluble impurities in the titanium liquid is finished, adding the titanium liquid into a hydrolysis tank for hydrolysis treatment, obtaining hydrated titanium dioxide after the hydrolysis treatment is finished, then washing and bleaching the hydrated titanium dioxide, finally calcining the hydrated titanium dioxide, and crushing the calcined material after the treatment is finished, thus obtaining the titanium dioxide.
Example 2:
the embodiment discloses equipment for a production process for increasing whiteness of titanium dioxide, which comprises a shell 1 and a liquid storage tank 2, wherein the shell 1 is cylindrical, the liquid storage tank 2 is positioned at the lower side of the shell 1, a circulating pump 3 is arranged in the liquid storage tank 2, a liquid outlet pipe 4 is arranged at the upper end of the liquid storage tank 2, and the bottom end of the liquid outlet pipe 4 is communicated with a liquid outlet of the circulating pump 3;
be equipped with a plurality of circulative cooling subassembly on drain pipe 4, and the circulative cooling subassembly includes first processing dish 5 and second processing dish 6, first processing dish 5 and second processing dish 6 all are the toper form, and each other is the mirror image setting between first processing dish 5 and the second processing dish 6, the outside of first processing dish 5 is equipped with the first class of a plurality of 7, second processing dish 6 is located the downside of first processing dish 5, and the inboard of second processing dish 6 is equipped with a plurality of second runner 8, the upside of second processing dish 6 is equipped with solid fixed ring 9, and solid fixed ring 9 and drain pipe 4 fixed connection, gu fixed ring 9 still is through first spring 10 and second processing dish 6 elastic connection, the downside of second processing dish 6 is equipped with water-collecting plate 11, and water-collecting plate 11 cup joints on drain pipe 4, water-collecting plate 11 is through first connecting rod 12 and second processing dish 6 fixed connection, and water-collecting plate 11's downside is equipped with the first drain hole 13 of a plurality of, the inboard of shell 1 is equipped with a plurality of impurity processing mechanism, and impurity processing mechanism's position and the first class of 7 one-to-one-for-ones quantity.
The second treating tray 6 has a plurality of second drain holes 27 at its lower end, and the second drain holes 27 are communicated with the second flow path 8.
Traditional titanium liquid is when cooling the crystallization, generally all place in the agitator tank, set up a water jacket in the outside of agitator tank, the external cooling water that can the circulation flow of water jacket comes to cool down the agitator tank, be equipped with stirring vane in the agitator tank, stirring vane is by motor drive, come to stir solution, if stirring speed is too fast, then the crystal granule will be too thin, the crystal is thin not only makes the filtration of solution become comparatively troublesome, moreover the incomplete problem of filtration appears easily, this embodiment technical scheme cools off the crystallization to titanium liquid through adopting the circulative cooling's mode.
The liquid storage tank 2 is used for storing solution, the solution in the liquid storage tank 3 can be conveyed to the upper end of the shell 1 through the circulating pump 3 and the liquid outlet pipe 4, the solution can firstly fall onto the first processing disc 5 after flowing out of the liquid outlet pipe 4, then sequentially passes through the first flow channel 7, the guide plate 17 and the second flow channel 8, and then flows into the water collection plate 11 through the second water discharge hole 27, a groove is formed in the upper side of the water collection plate 11, the first water discharge hole 13 is formed in the lower side of the water collection plate 11, the solution can flow onto the next first processing disc 5 through the first water discharge hole 13, and sequentially reciprocates until the solution flows into the liquid storage tank 2 again, the first processing disc 5 and the second processing disc 6 are both internally provided with a cooling liquid storage tank, and meanwhile, the first processing disc 5 and the second processing disc 6 are also provided with a cooling liquid inlet and a cooling liquid outlet, namely, when the solution flows through the first flow channel 7 and the second flow channel 8, the solution can be cooled.
Impurity treatment mechanism includes fixing base 14, material collecting vat 15, support frame 16 and guide plate 17, the upper end of fixing base 14 is equipped with holding tank 18, and the downside of fixing base 14 is equipped with drain pipe 19, spout and shell 1 upper and lower sliding connection are passed through to fixing base 14's one end, and fixing base 14 still passes through supporting spring 20 and shell 1 elastic connection, support frame 16 is located fixing base 14's upside, and support frame 16's bottom and fixing base 14 fixed connection, guide plate 17 is located support frame 16's upside, and guide plate 17's one end is rotated through pivot and support frame 16 and is connected, guide plate 17's upside is equipped with filtration pore plate 21, filtration pore plate 21 is the triangle form, and filtration pore plate 21 passes through second connecting rod 22 and guide plate 17 fixed connection, material collecting vat 15 is located fixing base 14's upside, and material collecting vat 15's one end is pegged graft in shell 1, material collecting vat 15's top is open structure, and material collecting vat 15's front end is equipped with the inclined plane.
When the solution flows through the first flow passage 7 and the second flow passage 8, the solution is continuously cooled, when the temperature is lower than a certain threshold value, soluble impurities in the solution can be separated out in a crystal form, the separated impurities can be collected by arranging an impurity treatment mechanism, the solution can firstly pass through the guide plate 17 and the filter orifice plate 21 and then fall onto the second treatment disc 6 in the flowing process, the filter orifice plate 21 and the guide plate 17 are fixed together, crystal impurities can be filtered through the filter orifice plate 21, the filtered crystal impurities can remain on the filter orifice plate 21, along with the increase of the weight, the filter orifice plate 21 and the guide plate 17, the support frame 16 and the fixing seat 14 move downwards together, at the moment, the second treatment disc 6 is kept immovable, one end of the guide plate 17 is abutted against the second treatment plate 6 in the downward movement process, and one end of the guide plate 17 is rotatably connected with the support frame 16 through the rotating shaft, so that the guide plate 17 has the turning capability, when one end of the guide plate 17 close to the second treatment plate 6 is tilted, the solution can not flow into the second treatment plate 6, after the solution in the second treatment plate 6 is completely flowed, the weight of the second treatment plate 6 becomes light, at the moment, the second treatment plate 6 can move upwards under the driving of the first spring 10, the guide plate 17 can be pushed by the second treatment plate 6 in the upward movement process to turn over, and thus, the crystal impurities on the filter pore plate 21 can fall into the material collecting tank 15;
along with the change of the inclination angle of the guide plate 17, a part of solution can flow into the storage tank 18 under the action of the guide plate 17, along with the increase of the solution, the fixed seat 14 can move downwards again, in the moving process of the solution, one end of the filter orifice plate 21 can be abutted against the material collecting tank 15, because one end of the material collecting tank 15 close to the support frame 16 is provided with an inclined plane, under the action of the material collecting tank 15, the filter orifice plate 21 can turn back to the original position, the solution in the storage tank 18 can be discharged into the water collecting plate 11 through the drain pipe 19, because the water collecting plate 11 is fixed together with the second processing disk 6, along with the increase of the weight, the water collecting plate 11 can drive the second processing disk 6 to move downwards, so that the second processing disk 6 returns to the original position, and in the process, the guide plate 17 can guide the solution into the second processing disk 6 again.
The outer end of the second flow channel 8 is provided with a top block 23, the top block 23 is in a right-angled triangle shape, one end of the top block 23 is provided with a connecting column 24, the connecting column 24 is inserted into the second processing disc 6, and the end part of the connecting column 24 is elastically connected with the second processing disc 6 through a second spring 25. The guide plate 17 is provided with a limiting bulge 1701 at the lower side of one end close to the second processing disk 6, and the bottom end of the limiting bulge 1701 is abutted against the top block 23.
Further, in order to ensure that the guide plate 17 can reach a predetermined position when turning upwards, a plurality of top blocks 23 are arranged on the outer side of the second processing disk 6, the top blocks 23 are connected with the second processing disk 6 in a horizontal sliding manner under the action of the connecting column 24, because the top blocks 23 are in a right-angled triangle shape, when the guide plate 17 moves downwards, the top blocks 23 can be pushed towards one side firstly, when the guide plate 17 moves downwards, under the action of the second processing disk 6, one end of the top blocks, which is close to the second processing disk 6, can gradually tilt upwards, at the moment, the gravity center of the assembly of the guide plate 17 and the filter orifice plate 21 can be changed, when the guide plate 17 turns over to a certain angle, the force applied to the top blocks 23 by the guide plate 17 can be smaller than the elastic force provided by the second springs 25, the top blocks 23 can pop up under the action of the second springs 25, and the guide plate 17 can be pushed from the horizontal direction, so that the guide plate 17 can turn over.
Further, the lower extreme of support frame 16 is equipped with stopper 26, and stopper 26 is the L shape, stopper 26's one end and support frame 16 fixed connection, and stopper 26's the other end offsets with guide plate 17, and stopper 26 mainly plays an effect that the upset angle to guide plate 17 carries out the restriction.
Further, the upper end of the liquid storage tank 2 is provided with a diversion disc 28, the diversion disc 28 is in a conical shape, the diversion disc 28 is fixed on the liquid outlet pipe 4, and the first drainage hole 13 faces the circulating pump 3, so that the diversion disc 28 is arranged on the upper side of the circulating pump 3, and the function of protecting the circulating pump 3 is achieved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A production process for increasing whiteness of titanium dioxide is characterized by comprising the following steps:
s1, raw material treatment: adding ilmenite into a grinder for grinding, performing coarse and fine separation on the ilmenite through a winnowing machine after grinding, returning unqualified ilmenite to the grinder for reprocessing, and conveying qualified powder into a storage bin for storage;
s2, acidolysis treatment: adding the powder prepared in the step S1 into an acidolysis tank, adding sulfuric acid with the concentration of 91-95% into the acidolysis tank, uniformly stirring, introducing steam into the acidolysis tank, carrying out acidolysis reaction on the material under the action of the steam, standing for a period of time after the acidolysis reaction, adding water into the acidolysis tank, leaching and extracting the material by water, and obtaining a titanium solution after the extraction is finished;
s3, settling treatment: conveying the titanium liquid into a sedimentation tank, adding a flocculating agent into the tank, and precipitating insoluble impurities and colloidal particles in the titanium liquid through the flocculating agent;
s4, cooling and crystallizing, namely adding the titanium liquid into cooling and impurity removing equipment to remove iron in the titanium liquid, performing sedimentation treatment to obtain a large amount of soluble impurities which mainly exist in a ferrous sulfate form, cooling the titanium liquid by using a cooling medium to ensure that the ferrous sulfate in the solution is in a saturated state, and then separating out the ferrous sulfate along with the reduction of the temperature;
s5, subsequent processing: after soluble impurities and insoluble impurities in the titanium liquid are treated, adding the titanium liquid into a hydrolysis tank for hydrolysis treatment, obtaining hydrated titanium dioxide after the hydrolysis treatment is finished, then washing and bleaching the hydrated titanium dioxide, finally calcining the hydrated titanium dioxide, and crushing the calcined material after the treatment is finished to obtain titanium dioxide;
the cooling impurity removal device in the step 4 comprises a shell (1) and a liquid storage tank (2), wherein the shell (1) is cylindrical, the liquid storage tank (2) is located on the lower side of the shell (1), a circulating pump (3) is arranged in the liquid storage tank (2), a liquid outlet pipe (4) is arranged at the upper end of the liquid storage tank (2), and the bottom end of the liquid outlet pipe (4) is communicated with a liquid outlet of the circulating pump (3);
be equipped with a plurality of circulative cooling subassembly on drain pipe (4), just circulative cooling subassembly includes first processing dish (5) and second processing dish (6), first processing dish (5) with second processing dish (6) all are the toper form, just first processing dish (5) with each other is the mirror image setting between second processing dish (6), the outside of first processing dish (5) is equipped with a plurality of first runner (7), second processing dish (6) are located the downside of first processing dish (5), just the inboard of second processing dish (6) is equipped with a plurality of second runner (8), the upside of second processing dish (6) is equipped with solid fixed ring (9), just gu fixed ring (9) with drain pipe (4) fixed connection, gu fixed ring (9) still through first spring (10) with second processing dish (6) elastic connection, the downside of second processing dish (6) is equipped with water-collecting plate (11), just water-collecting plate (11) cup joint on drain pipe (4) impurity handling dish (11) the inboard of a plurality of impurity substance (11) and first processing dish (11) and impurity mechanism (13), the inboard of first processing dish (11) and impurity connection mechanism (11) are equipped with a plurality of first processing dish (11), and impurity (11) one by one the downside of water-by one is equipped with first processing dish (11), the impurity connection mechanism (11), the impurity is equipped with the first processing dish (11) is equipped with the impurity (11) and the first processing dish (11) are equipped with the handle the water-flow of impurity mechanism (6) and handle the downside of impurity (11), the impurity (11) and the impurity mechanism (11) and the first processing dish (11) and the impurity body (11), the first processing dish (6) are equipped with the first processing dish (11) and the first processing dish (6) are equipped with the first processing dish (7) the water collecting plate (11) the impurity body one (ii) a
The impurity treatment mechanism comprises a fixed seat (14), a material collecting tank (15), a support frame (16) and a guide plate (17), wherein a storage tank (18) is arranged at the upper end of the fixed seat (14), a drain pipe (19) is arranged on the lower side of the fixed seat (14), one end of the fixed seat (14) is connected with the shell (1) in a sliding mode from top to bottom through a sliding groove, the fixed seat (14) is further connected with the shell (1) in an elastic mode through a support spring (20), the support frame (16) is located on the upper side of the fixed seat (14), the bottom end of the support frame (16) is fixedly connected with the fixed seat (14), the guide plate (17) is located on the upper side of the support frame (16), one end of the guide plate (17) is connected with the support frame (16) in a rotating mode through a rotating shaft, a filtering pore plate (21) is arranged on the upper side of the guide plate (17), the filtering pore plate (21) is in a triangular shape, the filtering pore plate (21) is fixedly connected with the guide plate (17) through a second connecting rod (22), the material collecting tank (15) is located on the upper side of the fixed seat (14), and one end of the material collecting tank (15) is inserted into the shell (1).
2. The production process for increasing the whiteness of titanium dioxide according to claim 1, which is characterized in that: the top of the material collecting tank (15) is of an open structure, and an inclined plane is arranged at the front end of the material collecting tank (15).
3. The production process for increasing the whiteness of titanium dioxide according to claim 2, which is characterized in that: the outer end of the second flow channel (8) is provided with an ejector block (23), the ejector block (23) is in a right-angled triangle shape, one end of the ejector block (23) is provided with a connecting column (24), the connecting column (24) is inserted into the second processing disc (6), and the end part of the connecting column (24) is elastically connected with the second processing disc (6) through a second spring (25).
4. The production process for increasing the whiteness of titanium dioxide according to claim 3, which is characterized in that: the guide plate (17) is close to the lower side of one end of the second treatment disc (6) and is provided with a limiting bulge (1701), and the bottom end of the limiting bulge (1701) is abutted to the top block (23).
5. The production process for increasing the whiteness of titanium dioxide according to claim 4, which is characterized in that: the lower extreme of support frame (16) is equipped with stopper (26), just stopper (26) are the L shape, the one end of stopper (26) with support frame (16) fixed connection, just the other end of stopper (26) with guide plate (17) offset.
6. The production process for increasing the whiteness of titanium dioxide according to claim 5, which is characterized in that: the lower end of the second processing disc (6) is provided with a plurality of second drain holes (27), and the second drain holes (27) are communicated with the second flow channel (8).
7. The production process for increasing the whiteness of titanium dioxide according to claim 6, which is characterized in that: the upper end of the liquid storage tank (2) is provided with a flow guide disc (28), the flow guide disc (28) is in a conical shape, and the flow guide disc (28) is fixed on the liquid outlet pipe (4).
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