CN113144644B - Titanium dioxide concentration process - Google Patents
Titanium dioxide concentration process Download PDFInfo
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- CN113144644B CN113144644B CN202110363888.5A CN202110363888A CN113144644B CN 113144644 B CN113144644 B CN 113144644B CN 202110363888 A CN202110363888 A CN 202110363888A CN 113144644 B CN113144644 B CN 113144644B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
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- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
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Abstract
The application relates to the field of titanium dioxide production, and discloses a titanium dioxide concentration system and a process, wherein the titanium dioxide concentration system comprises an evaporation module, a condensation module and a heat recovery module, wherein the evaporation module is used for concentrating a light titanium liquid; the evaporation module comprises a light titanium groove, a heat exchanger, an evaporation chamber, a concentrated titanium groove, a cyclone separator, a primary steam condenser, a secondary steam condenser and a vacuum pump; the light titanium tank is connected with a heat exchanger, and the heat exchanger is connected with the evaporation chamber; the heat exchanger is connected with the evaporation chamber; the evaporation chamber is connected with the concentrated titanium tank and the cyclone separator; the cyclone separator is connected with the concentrated titanium tank, the cyclone separator is connected with the primary steam condenser, and the primary steam condenser is connected with the vacuum pump; the secondary steam condenser is connected with the primary steam condenser, and the secondary steam condenser is connected with the vacuum pump. The application has the effect of alleviating the problem of corrosion of the concentration system equipment by acidic semi-dehydration.
Description
Technical Field
The application relates to the field of titanium dioxide production, in particular to a titanium dioxide concentration system and a titanium dioxide concentration process.
Background
Titanium dioxide is an important inorganic chemical raw material, is non-toxic and harmless to health, is the most important white pigment and accounts for 80 percent of the total white pigment. More than 90% of the mined titanium ore is used worldwide for the production of TiO2 pigment. In 1998, the world's total TiO2 pigment consumption is 355 million tons, the total value is 70 hundred million dollars per unit price of 2000/ton, and the pigment is the third largest inorganic chemical product which is second only to the synthesis of ammonia and phosphoric acid. The production process of titanium dioxide mainly comprises a sulfuric acid method and a chlorination method.
The production process of titanium dioxide by a sulfuric acid method mainly comprises the following steps: preparing raw ore, preparing titanium sulfate solution, purifying titanium solution, concentrating the titanium solution, hydrolyzing, washing and rinsing, treating salt, calcining and post-treating. In the concentration process of the titanium liquid, a continuous film evaporator is generally adopted to evaporate water in the titanium liquid under the condition of reduced pressure and vacuum so as to meet the requirement of a hydrolysis process, and the hydrolysis process is carried out under higher acidity.
However, in the concentration process in the above-mentioned related art, the obtained concentrated titanium solution has acidity after hydrolysis, and the acidic semi-dehydration after hydrolysis needs heating before rinsing, so that in the conventional concentration process, the acidic semi-dehydration after hydrolysis is mostly heated by using heat in the concentration process, and thus, the acidic semi-dehydration easily corrodes concentration system equipment.
Disclosure of Invention
1. Technical problem to be solved
In order to reduce the problem that equipment of a concentration system is corroded by acid semi-dehydration, the application provides a titanium dioxide concentration system and a titanium dioxide concentration process.
2. Technical scheme
In order to solve the problems, the titanium dioxide concentration system and the titanium dioxide concentration process adopt the following technical scheme:
a titanium dioxide concentration system comprises an evaporation module for concentrating a dilute titanium liquid, a condensation module for condensing steam and a heat recovery module for heating acidic semi-dehydration; the evaporation module comprises a light titanium groove, a heat exchanger, an evaporation chamber, a concentrated titanium groove, a cyclone separator, a primary steam condenser, a secondary steam condenser and a vacuum pump; the outlet of the thin titanium tank is connected with the liquid inlet of the heat exchanger, and the liquid outlet of the heat exchanger is connected with the liquid inlet at the bottom of the evaporation chamber; steam is fed into a steam inlet of the heat exchanger, and a steam outlet of the heat exchanger is connected with a steam inlet connected with the evaporation chamber; a liquid outlet of the evaporation chamber is connected with the concentrated titanium tank, and a steam outlet of the evaporation chamber is connected with a steam inlet of the cyclone separator; the liquid outlet of the cyclone separator is connected with the concentrated titanium tank, the steam outlet of the cyclone separator is connected with the steam inlet of the primary steam condenser, the steam outlet of the primary steam condenser is connected with the vacuum pump, and a first switching valve is arranged between the primary steam condenser and the vacuum pump; the steam inlet of the secondary steam condenser is connected with the steam outlet of the primary steam condenser, and the steam outlet of the secondary steam condenser is connected with the vacuum pump; the condensation module comprises a water cooling tower water tank and a circulating pump, an outlet of the water cooling tower water tank is connected with an inlet of the circulating pump, an outlet of the circulating pump is connected with a condensed water inlet of the secondary steam condenser, and a condensed water outlet of the secondary steam condenser is communicated with the water cooling tower water tank; the heat recovery module comprises a water seal tank, a condensed water inlet of the primary steam condenser is connected to acidic semi-dehydration formed after the hydrolysis of the concentrated titanium liquid in the concentrated titanium tank, and a condensed water outlet of the primary steam condenser is communicated with the water seal tank.
By adopting the technical scheme, when the evaporation module works, the light titanium liquid in the light titanium tank enters the heat exchanger to be heated and enters the evaporation chamber, so that solute in the light titanium liquid is heated and evaporated, the light titanium liquid is concentrated into concentrated titanium liquid and is guided into the concentrated titanium tank, and part of solute enters the cyclone separator along with steam to be separated, so that the part of solute is separated and is guided into the concentrated titanium tank, the concentration degree of the titanium liquid is improved, meanwhile, the vacuum pump is started, and the steam in the cyclone separator is discharged through the primary evaporation condenser and the secondary evaporation condenser in sequence; when the condensation module works, the circulating pump is started, so that the water tank of the water cooling tower continuously circulates through the secondary evaporation condenser, and the steam is fully condensed; when the heat recovery module during operation, acid semi-dehydration passes through in the water seal groove of rethread behind the steam condenser, then acid semi-dehydration after being heated in the water seal groove carries out rinsing on next step again, thereby steam waste heat in the concentrated technology has been utilized, in addition, compare with current concentrated system, to acid semi-dehydration in this concentrated system be heated, through switching first change-over valve, only through steam condenser once can, to equipment such as heat exchanger, evaporating chamber and steam condenser do not have the corrosivity damage, so be favorable to alleviateing the problem that concentrated system equipment is corroded by acid semi-dehydration.
Preferably, the heat exchanger comprises a cylinder shell and a heat exchange tube arranged in the cylinder shell, the cylinder shell is provided with a first steam port for connecting steam, and the first steam port is communicated with the inside of the cylinder shell; one end of the heat exchange tube extends out of the bottom surface of the cylinder shell and is connected with the thin titanium groove, and the other end of the heat exchange tube extends into the evaporation chamber; the bottom surface of the evaporation chamber is fixed with the cylinder shell, an inner heating chamber is fixed in the evaporation chamber, and the end part of the heat exchange tube extends into the inner heating chamber; a liquid passing pipe is arranged in the inner heating chamber, one end of the liquid passing pipe is connected with the end part of the heat exchange pipe, and the other end of the liquid passing pipe extends to a position between the inner heating chamber and the evaporation chamber; a second steam port connected with the cyclone separator is arranged at the top of the evaporation chamber, and a liquid outlet connected with the concentrated titanium tank is arranged at the bottom of the evaporation chamber; evaporation holes are formed in the top surface of the inner heating chamber, and an air communicating piece is arranged between the inner heating chamber and the top of the barrel shell.
Through adopting above-mentioned technical scheme, steam passes through in the first steam port gets into the barrel casing, and the light titanium liquid in the light titanium groove passes through the heat exchange tube and leads to in the liquid pipe gets into the evaporating chamber, thereby make light titanium liquid by steam heating, make the solute in the light titanium liquid constantly evaporate, thereby make light titanium liquid concentrate to concentrated titanium liquid, and steam in the barrel casing gets into in the steam chamber through the piece of ventilating, the rethread cyclone, make titanium liquid after the heat transfer continue to contact with steam in the evaporating chamber, thereby make titanium liquid can fully be heated the concentration.
Preferably, the inner heating chamber is in a circular truncated cone shape, and the inner heating chamber is arranged in a hollow manner.
Through adopting above-mentioned technical scheme, interior heating chamber is the round platform form for the titanium liquid that drops on interior heating chamber lateral wall can flow to in the evaporating chamber.
Preferably, a plurality of liquid passing pipes are arranged and evenly distributed around the vertical central line of the inner heating chamber.
Through adopting above-mentioned technical scheme, lead to the setting of liquid pipe for titanium liquid dispersion in the heat exchange tube flows to the evaporating chamber in, thereby makes titanium liquid also receive the heating effect of steam in leading to the liquid pipe, makes being heated of titanium liquid more even, more abundant.
Preferably, the vent comprises an elastic plug embedded between the bottom surface of the evaporation chamber and the top surface of the cylinder shell and an elastic membrane fixed in the elastic plug; the elastic plug is provided with a needle hole in a penetrating way, and the elastic membrane is arranged in the needle hole; the elastic membrane is provided with a ventilation cutting seam.
Through adopting above-mentioned technical scheme, steam in the heat exchanger enters into interior heating chamber through the ventilative kerf on the elastic diaphragm for steam in the heat exchanger and the steam in the steam chamber are separated relatively, are favorable to strengthening the heating effect in the heat exchanger.
Preferably, ventilative joint-cutting includes four encircles arc seam and eight resilience seams that set up the pinhole axis, resilience seam one end with arc seam end connection, the other end orientation elastic diaphragm center is extended, and arc seam both ends respectively are connected with a resilience seam.
Through adopting above-mentioned technical scheme, when the steam atmospheric pressure in the heat exchanger reaches certain numerical value, the atmospheric pressure difference of elastic diaphragm both sides is enough, and at this moment, elastic diaphragm warp for the arc seam opening warp along the extending direction of resilience seam, thereby makes arc seam opening grow, makes steam can get into in the evaporating chamber.
Preferably, the number of the first steam ports is two, and the two first steam ports are respectively arranged at the top and the bottom of the cylinder shell.
Through adopting above-mentioned technical scheme, the setting of first steam port for insert the steam offset in the shell, thereby offset the kinetic energy that steam got into in the shell, make the steam velocity of flow slow down, make and reach certain atmospheric pressure value in the shell and just can export steam to in the evaporating chamber, further strengthened the heat exchange efficiency of heat exchanger.
Preferably, the heat exchange tube is bulged at the middle part and is provided with a heat increasing bulge.
Through adopting above-mentioned technical scheme, the setting of heat gain bellying for the internal diameter of heat exchange tube suddenly increases when light titanium liquid flows to the heat exchange tube middle part, has slowed down the velocity of flow of light titanium liquid at this department, makes light titanium liquid can be fully heated in steam offset position.
A titanium dioxide concentration process comprises the following steps: a. exchanging heat, namely introducing the light titanium liquid into a heat exchanger to be heated, and then introducing the heated light titanium liquid into an evaporation chamber; b. separating, namely introducing secondary steam generated in the evaporation chamber into a cyclone separator for separation, separating titanium liquid solute contained in the secondary steam from the steam, and introducing the titanium liquid solute into a concentrated titanium tank; c. and (3) condensing, namely introducing the steam led out from the cyclone separator into a steam condenser for condensation, and introducing the acidic semi-dehydration into the steam condenser for heating.
By adopting the technical scheme, the problem that the original concentration system equipment is corroded by acidic water is solved; the problem that the concentration yield is influenced by the change of the water consumption of the second washing is solved, the water temperature of the washing water is ensured, and the purpose of random adjustment is achieved; the problems that the original semi-dehydration is directly heated by steam, the steam is robbed at each post, the steam is insufficient, the water temperature does not reach the standard, the washing is difficult, and the steam is wasted are solved; solves the problems that semi-dehydrated resin is produced due to the influence of water pollution when semi-dehydrated resin is produced after concentration and heating, the production process is long and the water temperature is low.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) compared with the existing concentration system, the concentration system heats the acidic semi-dehydration, only needs the primary steam condenser by switching the first switching valve, and has no corrosive damage to equipment such as a heat exchanger, an evaporation chamber, a secondary steam condenser and the like, so that the problem that the equipment of the concentration system is corroded by the acidic semi-dehydration is favorably solved;
(2) the arrangement of the heat increasing bulge part ensures that the inner diameter of the heat exchange tube is suddenly increased when the light titanium liquid flows to the middle part of the heat exchange tube, the flow velocity of the light titanium liquid at the position is slowed down, and the light titanium liquid is fully heated at the steam hedging position;
(3) the problems that the original semi-dehydration is directly heated by steam, the steam rush at each post is caused, the steam is insufficient, the water temperature does not reach the standard, the washing is difficult, and the steam is wasted are solved.
Drawings
FIG. 1 is a schematic structural diagram of a titanium dioxide concentration system according to the first embodiment;
FIG. 2 is a schematic view of the internal structure of a heat exchanger of a titanium dioxide concentration system according to the second embodiment of the present application;
FIG. 3 is a schematic view of the internal structure of the vent of the second embodiment;
FIG. 4 is a schematic view of the internal structure of the elastic diaphragm according to the second embodiment of the present application;
FIG. 5 is a schematic view of the titanium dioxide concentration process of example III.
The reference numbers in the figures illustrate:
1. a titanium-depleted tank; 2. a heat exchanger; 21. a cartridge housing; 211. a first steam port; 22. a heat exchange pipe; 221. a heat-increasing protrusion; 3. an evaporation chamber; 31. an inner heating chamber; 311. an evaporation hole; 312. a liquid pipe is communicated; 32. a second steam port; 33. a liquid outlet; 34. a venting member; 341. an elastic plug; 342. an elastic diaphragm; 3421. an arc-shaped seam; 3422. springback seams; 4. a concentrated titanium tank; 5. a cyclone separator; 61. a primary steam condenser; 62. a secondary steam condenser; 63. a first switching valve; 64. a second switching valve; 65. a third switching valve; 66. a fourth switching valve; 7. a vacuum pump; 8. a condensing module; 81. a water tank of a cooling tower; 82. a circulation pump; 9. and (5) sealing the tank with water.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise specifically stated or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements.
Example 1:
referring to fig. 1, the evaporation module includes a thin titanium tank 1, a heat exchanger 2, an evaporation chamber 3, a thick titanium tank 4, a cyclone separator 5, a primary steam condenser 61, a secondary steam condenser 62, and a vacuum pump 7. An outlet of the thin titanium tank 1 is connected with a liquid inlet of the heat exchanger 2, and a liquid outlet 33 of the heat exchanger 2 is connected with a liquid inlet at the bottom of the evaporation chamber 3. Steam is connected to a steam inlet of the heat exchanger 2, and a steam outlet of the heat exchanger 2 is connected with a steam inlet of the evaporation chamber 3. The liquid outlet 33 of the evaporation chamber 3 is connected with the concentrated titanium tank 4, and the steam outlet of the evaporation chamber 3 is connected with the steam inlet of the cyclone separator 5. The liquid outlet 33 of the cyclone separator 5 is connected with the concentrated titanium tank 4, the steam outlet of the cyclone separator 5 is connected with the steam inlet of the primary steam condenser 61, the steam outlet of the primary steam condenser 61 is connected with the vacuum pump 7, and a first switching valve 63 is arranged between the primary steam condenser 61 and the vacuum pump 7. The steam inlet of the secondary steam condenser 62 is connected to the steam outlet of the primary steam condenser 61, and the steam outlet of the secondary steam condenser 62 is connected to the vacuum pump 7.
Referring to fig. 1, the condensing module 8 includes a water cooling tower tank 81 and a circulating pump 82, an outlet of the water cooling tower tank 81 is connected to an inlet of the circulating pump 82, an outlet of the circulating pump 82 is connected to a condensed water inlet of the secondary steam condenser 62, and a condensed water outlet of the secondary steam condenser 62 is communicated with the water cooling tower tank 81. The heat recovery module comprises a water seal tank 9, an acid semi-dehydration part formed after the hydrolysis of concentrated titanium liquid in the concentrated titanium tank 4 is connected to a condensed water inlet of the primary steam condenser 61, and a condensed water outlet of the primary steam condenser 61 is communicated with the water seal tank 9. As shown in fig. 1, the connections between the above components are all pipe connections, a second switching valve 64 is installed between the thin titanium tank 1 and the heat exchanger 2, a third switching valve 65 is installed between the heat exchanger 2 and the thick titanium tank 4, and a fourth switching valve 66 is installed on a steam inlet of the heat exchanger 2.
The implementation principle of a titanium dioxide concentration system in the embodiment of the application is as follows: when the evaporation module works, the second switching valve 64, the third switching valve 65 and the fourth switching valve 66 are opened, the first switching valve 63 is closed, the light titanium liquid in the light titanium tank 1 enters the heat exchanger 2 to be heated and enters the evaporation chamber 3, solute in the light titanium liquid is heated and evaporated, the light titanium liquid is concentrated into concentrated titanium liquid and is introduced into the concentrated titanium tank 4, part of solute enters the cyclone separator 5 along with steam to be separated, the part of solute is separated and is introduced into the concentrated titanium tank 4, the concentration degree of the titanium liquid is improved, meanwhile, the vacuum pump 7 is started, and the steam in the cyclone separator 5 is discharged through the primary evaporation condenser and the secondary evaporation condenser in sequence; when the condensation module 8 works, the circulating pump 82 is started, so that the water tank 81 of the water cooling tower continuously circulates through the secondary evaporative condenser, and the steam is fully condensed; when the heat recovery module works, the first switching valve 63 is opened, the acidic semi-dehydrated water passes through the secondary steam condenser 62 and then enters the water seal tank 9, and then the heated acidic semi-dehydrated water in the water seal tank 9 is rinsed next step, so that the steam waste heat in the concentration process is utilized; compared with the existing concentration system, the concentration system heats the acidic semi-dehydration, only needs the primary steam condenser 61 by switching the first switching valve 63, has no corrosive damage to the equipment such as the heat exchanger 2, the evaporation chamber 3, the secondary steam condenser 62 and the like, and is favorable for reducing the problem that the equipment of the concentration system is corroded by the acidic semi-dehydration.
Example two
The difference between this embodiment and the first embodiment is only the further improvement of the structure of the heat exchanger 2 and the evaporating chamber 3, and the following describes the improvement of the heat exchanger 2 and the evaporating chamber 3 in detail.
Referring to fig. 2, the heat exchanger 2 includes a cylindrical shell 21 and a heat exchange tube 22, the cylindrical shell 21 is cylindrical, the outer wall of the cylindrical shell is coated with a thermal insulation material, such as polyurethane, and the cylindrical shell 21 is vertically disposed. Be equipped with first steam port 211 on barrel casing 21, first steam port 211 and barrel casing 21 inside wall intercommunication, and first steam port 211 is equipped with two altogether, and two first steam ports 211 set up both ends about barrel casing 21 respectively, and when two first steam ports 211 all inserted steam, the steam at barrel casing 21 both ends offset the kinetic energy of steam in barrel casing 21 middle part offset. The heat exchange tube 22 is a copper tube, and is vertically arranged in the cylindrical shell 21, and the axis of the heat exchange tube 22 coincides with the axis of the cylindrical shell 21. The lower end of the heat exchange tube 22 penetrates out of the bottom surface of the cylinder shell 21 and is connected with the thin titanium tank 1 through a pipeline, and the upper end of the heat exchange tube 22 is arranged in a closed mode and penetrates out of the top surface of the cylinder shell 21. In addition, the heat exchange tube 22 is bulged at the middle part to form a spherical heat increasing bulge 221, so that the steam hedging position is close to the heat increasing bulge 221, and the heating effect of the steam on the thin titanium liquid in the heat exchange tube 22 is enhanced.
Referring to fig. 2, the evaporation chamber 3 is disposed on the top of the cartridge case 21, and the bottom surface of the evaporation chamber 3 is attached and fixed to the top surface of the cartridge case 21. The evaporation chamber 3 is cylindrical, the axis of the evaporation chamber coincides with the axis of the cylinder shell 21, and the outer wall of the evaporation chamber 3 is also coated with a polyurethane thermal insulation material. An inner heating chamber 31 is fixed in the evaporation chamber 3, and the inner heating chamber 31 is in a circular truncated cone shape and is hollow inside. Twenty steam holes are uniformly formed in the top surface of the inner heating chamber 31, and a liquid through pipe 312 is arranged in the inner heating chamber 31. The upper end of the heat exchange tube 22 penetrates into the evaporation chamber 3 and extends into the inner heating chamber 31, one end of the liquid through tube 312 is fixedly connected and communicated with the upper end of the heat exchange tube 22, and the other end of the liquid through tube is communicated with the outer side wall of the inner heating chamber 31. In addition, the liquid passing pipes 312 are four in number, and the four liquid passing pipes 312 are uniformly distributed around the axis of the inner heating chamber 31. And the top surface of the evaporation chamber 3 is provided with a second steam port 32 connected with the cyclone separator 5 through a pipeline, and the bottom surface of the evaporation chamber 3 is provided with two liquid outlets 33 connected with the concentrated titanium tank 4. The liquid outlet 33 is communicated with the inner bottom surface of the evaporation chamber 3, and an opening of the liquid outlet 33 communicated with the inner bottom surface of the evaporation chamber 3 is positioned outside the inner heating chamber 31.
Referring to fig. 2, four sets of ventilation pieces 34 are uniformly distributed around the inner heating chamber 31 between the evaporation chamber 3 and the drum casing 21, and the upper ends of the ventilation pieces 34 are located in the inner heating chamber 31, and as shown in fig. 3, the ventilation pieces 34 include an elastic plug 341 embedded between the bottom surface of the evaporation chamber 3 and the top surface of the drum casing 21, and an elastic membrane 342 fixed in the elastic plug 341. A pinhole is vertically arranged on the elastic plug 341 in a penetrating manner, the elastic membrane 342 is horizontally fixed in the pinhole, and as shown in fig. 4, a ventilation slit is arranged on the elastic membrane 342 and comprises four arc-shaped slits 3421 arranged around the axis of the pinhole and eight rebound thread slits 3422. One end of the resilient seam 3422 is connected to the end of the curved seam 3421, and the other end extends toward the center of the elastic membrane 342, and two ends of the curved seam 3421 are connected to a resilient seam 3422 respectively.
The second titanium dioxide concentration system and the second titanium dioxide concentration process in the embodiment of the application have the implementation principle that: when the thin titanium liquid passes through the lower end of the heat exchange tube 22 and enters the barrel casing 21, the thin titanium liquid passes through the heat increasing bulge 221 in sequence, the liquid passing tube 312 enters the evaporation chamber 3, meanwhile, steam enters the barrel casing 21 through the first steam port 211, the thin titanium liquid in the barrel casing 21 is heated, then the steam in the barrel casing 21 is increased continuously until the steam pressure is enough, the opening of the arc-shaped seam 3421 on the elastic membrane 342 is deformed, the steam enters the evaporation chamber 3, the thin titanium liquid is heated further, the concentration efficiency of the titanium liquid is enhanced, in addition, the steam in the inner heating chamber 31 enters the evaporation chamber 3 through the steam holes and enters the cyclone separator 5 through the second steam port 32 at the top of the evaporation chamber 3.
EXAMPLE III
The embodiment of the application discloses a titanium dioxide concentration process, and with reference to fig. 5, the titanium dioxide concentration process comprises the following steps: a. exchanging heat, namely introducing the dilute titanium solution into a heat exchanger 2 to be heated, and then introducing the dilute titanium solution into an evaporation chamber 3; b. separating, namely introducing secondary steam generated in the evaporation chamber 3 into a cyclone separator 5 for separation, separating titanium liquid solute contained in the secondary steam from the steam, and introducing the titanium liquid solute into a concentrated titanium tank 4; c. and (3) condensing, namely introducing the steam led out from the cyclone separator 5 into a steam condenser for condensation, and introducing the acidic semi-dehydration into the steam condenser for heating.
The implementation principle of the titanium dioxide concentration system and the titanium dioxide concentration process in the embodiment of the application is as follows: the problem that the original concentration system equipment is corroded by acidic water is solved; the problem that the concentration yield is influenced by the change of the water consumption of the second washing is solved, the water temperature of the washing water is ensured, and the purpose of random adjustment is achieved; the problems that the original semi-dehydration is directly heated by steam, the steam is robbed at each post, the steam is insufficient, the water temperature does not reach the standard, the washing is difficult, and the steam is wasted are solved; solves the problems that semi-dehydrated resin is produced due to the influence of water pollution when semi-dehydrated resin is produced after concentration and heating, the production process is long and the water temperature is low.
The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (4)
1. A titanium dioxide concentration process is characterized in that: comprises an evaporation module for concentrating the dilute titanium liquid, a condensation module (8) for condensing steam and a heat recovery module for heating the acidic semi-dehydration;
the evaporation module comprises a light titanium groove (1), a heat exchanger (2), an evaporation chamber (3), a concentrated titanium groove (4), a cyclone separator (5), a primary steam condenser (61), a secondary steam condenser (62) and a vacuum pump (7); an outlet of the thin titanium tank (1) is connected with a liquid inlet of the heat exchanger (2), and a liquid outlet (33) of the heat exchanger (2) is connected with a liquid inlet at the bottom of the evaporation chamber (3); steam is introduced into a steam inlet of the heat exchanger (2), and a steam outlet of the heat exchanger (2) is connected with a steam inlet of the evaporation chamber (3); a liquid outlet (33) of the evaporation chamber (3) is connected with the concentrated titanium tank (4), and a steam outlet of the evaporation chamber (3) is connected with a steam inlet of the cyclone separator (5); a liquid outlet (33) of the cyclone separator (5) is connected with the concentrated titanium tank (4), a steam outlet of the cyclone separator (5) is connected with a steam inlet of the primary steam condenser (61), a steam outlet of the primary steam condenser (61) is connected with the vacuum pump (7), and a first switching valve (63) is arranged between the primary steam condenser (61) and the vacuum pump (7); the steam inlet of the secondary steam condenser (62) is connected with the steam outlet of the primary steam condenser (61), and the steam outlet of the secondary steam condenser (62) is connected with the vacuum pump (7);
the condensation module (8) comprises a water cooling tower water tank (81) and a circulating pump (82), the outlet of the water cooling tower water tank (81) is connected with the inlet of the circulating pump (82), the outlet of the circulating pump (82) is connected with the condensed water inlet of the secondary steam condenser (62), and the condensed water outlet of the secondary steam condenser (62) is communicated with the water cooling tower water tank (81);
the heat recovery module comprises a water seal tank (9), a condensed water inlet of the primary steam condenser (61) is connected into acidic semi-dehydration formed by hydrolyzing the concentrated titanium liquid in the concentrated titanium tank (4), and a condensed water outlet of the primary steam condenser (61) is communicated with the water seal tank (9); the heat exchanger (2) comprises a cylindrical shell (21) and a heat exchange tube (22) arranged in the cylindrical shell (21), wherein a first steam port (211) for connecting steam is formed in the cylindrical shell (21), and the first steam port (211) is communicated with the inside of the cylindrical shell (21); one end of the heat exchange tube (22) extends out of the bottom surface of the cylinder shell (21) and is connected with the light titanium groove (1), and the other end of the heat exchange tube (22) extends into the evaporation chamber (3); the bottom surface of the evaporation chamber (3) is fixed with the barrel shell (21), an inner heating chamber (31) is fixed in the evaporation chamber (3), and the end part of the heat exchange tube (22) extends into the inner heating chamber (31); a liquid passing pipe (312) is arranged in the inner heating chamber (31), one end of the liquid passing pipe (312) is connected with the end part of the heat exchange pipe (22), and the other end of the liquid passing pipe (312) extends to a position between the inner heating chamber (31) and the evaporation chamber (3); a second steam port (32) connected with the cyclone separator (5) is arranged at the top of the evaporation chamber (3), and a liquid outlet (33) connected with the concentrated titanium tank (4) is arranged at the bottom of the evaporation chamber (3); an evaporation hole (311) is formed in the top surface of the inner heating chamber (31), and an air communicating piece (34) is arranged between the inner heating chamber (31) and the top of the barrel shell (21); the ventilating piece (34) comprises an elastic plug (341) embedded between the bottom surface of the evaporation chamber (3) and the top surface of the cylinder shell (21) and an elastic membrane (342) fixed in the elastic plug (341); a needle hole is arranged on the elastic plug (341) in a penetrating way, and the elastic membrane (342) is arranged in the needle hole; the elastic membrane (342) is provided with a ventilation cutting seam; the air-permeable kerf comprises four arc-shaped seams (3421) arranged around the axis of the pinhole and eight rebound seams (3422), one end of each rebound seam (3422) is connected with the end of each arc-shaped seam (3421), the other end of each rebound seam extends towards the center of the elastic membrane (342), and two ends of each arc-shaped seam (3421) are respectively connected with one rebound seam (3422); two first steam ports (211) are arranged on the barrel shell (21), and the two first steam ports (211) are respectively arranged at the top and the bottom of the barrel shell (21); the middle part of the heat exchange tube (22) is bulged to form a heat increasing bulge part (221); when the light titanium liquid enters the barrel shell (21) through the lower end of the heat exchange tube (22), the light titanium liquid sequentially passes through the heat increasing bulge (221) and the liquid passing tube (312) to enter the evaporation chamber (3), meanwhile, steam enters the barrel shell (21) through the first steam port (211), the light titanium liquid in the barrel shell (21) is heated, then the steam in the barrel shell (21) is continuously increased until the steam pressure is enough, the opening of the arc-shaped seam (3421) on the elastic membrane (342) deforms, the steam enters the evaporation chamber (3), the light titanium liquid is further heated, the concentration efficiency of the titanium liquid is enhanced, in addition, the steam in the inner heating chamber (31) enters the evaporation chamber (3) through the steam hole and is connected into the cyclone separator (5) through the second steam port (32) at the top of the evaporation chamber (3).
2. The titanium dioxide concentration process according to claim 1, characterized in that: the inner heating chamber (31) is in a round table shape, and the inner heating chamber (31) is arranged in a hollow mode.
3. The titanium dioxide concentration process according to claim 2, characterized in that: the liquid passing pipes (312) are provided with a plurality of liquid passing pipes (312) which surround the vertical central line of the inner heating chamber (31) and are uniformly distributed.
4. The titanium dioxide concentration process according to claim 3, characterized in that: the method comprises the following steps: a. heat exchange, namely introducing the dilute titanium solution into a heat exchanger (2) to be heated, and then introducing the dilute titanium solution into an evaporation chamber (3); b. separating, namely introducing secondary steam generated in the evaporation chamber (3) into a cyclone separator (5) for separation, separating titanium liquid solute contained in the secondary steam from the steam, and introducing the titanium liquid solute into a concentrated titanium tank (4); c. and (3) condensing, namely introducing the steam led out from the cyclone separator (5) into a steam condenser for condensation, and introducing the acidic semi-dehydration into the steam condenser for heating.
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