Titanium liquid continuous crystallization device and method

Abstract

The invention relates to the technical field of titanium dioxide processing, in particular to a titaniferous solution continuous crystallization device which comprises a titaniferous solution input pipe and at least two crystallization chambers connected in sequence, the bottoms of the adjacent crystallization chambers are communicated with each other, a spray tower is arranged on the first crystallization chamber, the titaniferous solution input pipe is connected to the top of the spray tower and extends into the spray tower, and the titaniferous solution input pipe is communicated with the crystallization chambers. The lower end of the crystallization chamber at the tail end is provided with a discharge pipe, the discharge pipe is connected to a crystallized titanium liquid tank, the top of the spray tower on the first crystallization chamber is provided with a vacuum pipe, the tops of the other crystallization chambers are provided with vacuum pipes, the vacuum pipes are connected to a vacuum device, and the vacuum degree is sequentially increased from the first crystallization chamber to the crystallization chamber at the tail end. The invention further discloses a continuous crystallization method for the titanium liquid. The multiple crystallization chambers are connected in series, the vacuum degrees of the crystallization chambers are gradually increased, titanium liquid can be continuously crystallized when passing through all the crystallization chambers, crystallization stability and uniformity are good, meanwhile, chilled water is continuously used, and energy consumption is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of titanium dioxide processing, in particular to a titanium liquid continuous crystallization device and method. Background Art

[0002] At present, in the production process of titanium dioxide by sulfuric acid method, when the titanium liquid is crystallized to precipitate ferrous sulfate, chilled water is used to cool the titanium liquid, so that the ferrous sulfate is precipitated in the form of crystals, and then the titanium dioxide and ferrous sulfate are separated through the subsequent process.

[0003] At present, the precipitation process of ferrous sulfate in titanium liquid adopts the method of cooling with chilled water, and a crystallization chamber is used to store titanium liquid for cooling, which results in poor stability of crystallization, and is prone to insufficient precipitation, affecting subsequent separation. In addition, the equipment needs to be started and stopped intermittently, the equipment is easy to wear, and the energy consumption is high, and the output is low. Summary of the invention

[0004] In order to solve the above technical deficiencies, the present invention provides a titanium liquid continuous crystallization device and method, which can continuously crystallize the titanium liquid so that the precipitation of ferrous sulfate is sufficiently stable.

[0005] The present invention discloses a titanium liquid continuous crystallization device, comprising a titanium liquid input pipe, comprising at least two crystallization chambers connected in sequence, the bottoms of adjacent crystallization chambers are interconnected, a spray tower is arranged on the first crystallization chamber, the spray tower is connected to the first crystallization chamber, the titanium liquid input pipe is connected to the top of the spray tower and extends to the inside, a spray head is arranged on the titanium liquid input pipe inside the spray tower, a discharge pipe is arranged at the lower end of the terminal crystallization chamber, the discharge pipe is connected to a crystallization titanium liquid tank, a vacuum tube is arranged on the top of the spray tower on the first crystallization chamber, vacuum tubes are arranged on the tops of the remaining crystallization chambers, the vacuum tubes are connected to a vacuum device, the vacuum device is used to adjust the vacuum degree in each crystallization chamber, and the vacuum degree increases sequentially from the first crystallization chamber to the terminal crystallization chamber.

[0006] A condenser is arranged on the vacuum tube corresponding to each crystallization chamber, and a chilled water circulation pipe is arranged on the condenser. The condenser is used to cool the water vapor in the vacuum tube to control the vacuum degree.

[0007] The number of crystallization chambers is 4 or more. Except for the first crystallization chamber and the last crystallization chamber, two adjacent crystallization chambers are connected from the bottom of the latter crystallization chamber to the top of the former crystallization chamber through a reflux pipe, and a reflux pump is arranged on the reflux pipe.

[0008] A stirring shaft is arranged in each crystallization chamber, and a stirring blade is arranged on the stirring shaft. The stirring blade is in contact with the bottom of the crystallization chamber. A motor is arranged outside the crystallization chamber, and the motor drives the stirring shaft to rotate.

[0009] The chilled water circulation pipe is connected in sequence from the crystallization chamber at the end to the condenser corresponding to the first crystallization chamber. The chilled water circulation pipe is connected to the chilled water tank through a chilled water pump. The chilled water pump is arranged on the chilled water circulation pipe at the chilled water inlet of the condenser corresponding to the crystallization chamber at the end. An overflow trough is arranged on the chilled water circulation pipe under each condenser. An overflow pipe is arranged on the overflow trough. The overflow pipe is connected to the chilled water tank. A circulating water pump is arranged between two adjacent condensers. The circulating water pump is arranged on the chilled water circulation pipe between the overflow trough and the next condenser.

[0010] A heat exchanger is arranged in the refrigerated water tank, and the heat exchanger forms a circulation with the chiller through a water pump, and the chiller forms a circulation with the cooling tower through a water pump.

[0011] The number of the vacuum devices is one or more, a steam-water separator is arranged upstream of each vacuum device, and each steam-water separator is connected to one or more vacuum pipes.

[0012] A method for continuous crystallization of titanium liquid using the above-mentioned titanium liquid continuous crystallization device, wherein titanium liquid at 55-60°C is transported from a titanium liquid inlet pipe to a spray tower, and sprayed in the spray tower; the sprayed titanium liquid enters the first crystallization chamber, and flows to the terminal crystallization chamber in sequence, and is finally transported from the discharge pipe to a crystallization titanium liquid tank; the vacuum degree of the first crystallization chamber is controlled at 6-8KPa, and the vacuum degree of the terminal crystallization chamber is controlled at 1-2KPa.

[0013] There are six crystallization chambers, and the crystallization chambers from the first crystallization chamber to the end are defined as: Crystallization Chamber No. 1, Crystallization Chamber No. 2, Crystallization Chamber No. 3, Crystallization Chamber No. 4, Crystallization Chamber No. 5, and Crystallization Chamber No. 6 respectively; the vacuum degree of crystallization chamber No. 1 is 6-8KPa, and the titanium liquid temperature is greater than or equal to 42°C, the vacuum degree of crystallization chamber No. 2 is 5-6KPa, and the titanium liquid temperature is 38-42°C, the vacuum degree of crystallization chamber No. 3 is 3-4KPa, and the titanium liquid temperature is 33-38°C, the vacuum degree of crystallization chamber No. 4 is 3-4KPa, and the titanium liquid temperature is 28-33°C, the vacuum degree of crystallization chamber No. 5 is 2-3KPa, and the titanium liquid temperature is 23-28°C, and the vacuum degree of crystallization chamber No. 6 is 1-2KPa, and the titanium liquid temperature is 18-23°C; when the titanium liquid temperature in crystallization chamber No. 2, crystallization chamber No. 3, crystallization chamber No. 4, and crystallization chamber No. 5 is greater than the set temperature, the corresponding reflux pump is started to reflux the titanium liquid to the previous crystallization chamber.

[0014] The titanium liquid continuous crystallization device and method obtained by the present invention utilizes multiple crystallization chambers connected in series, and the vacuum degree of the crystallization chamber is gradually increased. The titanium liquid can achieve continuous crystallization when passing through each crystallization chamber, and the crystallization stability and uniformity are good. At the same time, chilled water is used continuously, which greatly reduces energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0016] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0017] Embodiment 1:

[0018] like Figure 1 As shown, the present invention discloses a titanium liquid continuous crystallization device, including a titanium liquid input pipe 1, including six crystallization chambers connected in sequence, the bottoms of adjacent crystallization chambers are interconnected, and the crystallization chambers from the first crystallization chamber to the end are respectively defined as: No. 1 crystallization chamber 3, No. 2 crystallization chamber 4, No. 3 crystallization chamber 5, No. 4 crystallization chamber 6, No. 5 crystallization chamber 7, and No. 6 crystallization chamber 8; a spray tower 2 is arranged on the No. 1 crystallization chamber 3, and the spray tower 2 is connected to the No. 1 crystallization chamber 3, the titanium liquid input pipe 1 is connected to the top of the spray tower 2 and extends to the inside, a spray head is arranged on the titanium liquid input pipe 1 inside the spray tower 2, a discharge pipe 15 is arranged at the lower end of the No. 6 crystallization chamber 8, and the discharge pipe 15 is connected to a crystallization titanium liquid tank 16, a vacuum tube 9 is arranged on the top of the spray tower 2 on the No. 1 crystallization chamber 3, and a vacuum tube 9 is arranged on the top of the remaining crystallization chambers, and the vacuum tube 9 is connected to a vacuum device 10, and the vacuum device 10 is used to adjust the vacuum degree in each crystallization chamber, and the vacuum degree increases from the No. 1 crystallization chamber 3 to the No. 6 crystallization chamber 8.

[0019] Since the overall volume of the crystallization chamber is relatively large, the overall volume of the six crystallization chambers is too large to be arranged in one crystallization tank, which is inconvenient for transportation and installation. Therefore, in the present embodiment, the first crystallization chamber 3, the second crystallization chamber 4, and the third crystallization chamber 5 are arranged in one crystallization tank, and the fourth crystallization chamber 6, the fifth crystallization chamber 7, and the sixth crystallization chamber 8 are arranged in one crystallization tank. Of course, when the site and transportation conditions permit, it is also possible to arrange all the crystallization chambers in one crystallization tank, or it is also possible to arrange each crystallization chamber in one crystallization tank. In the crystallization tank, the crystallization tank is divided into three crystallization chambers by two radial partitions, and the lower end of the partition is provided with a through hole for liquid flow. During normal operation, the liquid level of the titanium liquid will be higher than the through hole, and the crystallization chamber above the titanium liquid has a certain space, which is pumped to a certain vacuum degree by the vacuum tube 9 and the vacuum device 10. The space of the crystallization chamber on the titanium liquid is independent of each other, so it can ensure that the vacuum degree of each crystallization chamber is independent. The third crystallization chamber 5 is connected to the fourth crystallization chamber 6 through a pipeline.

[0020] During normal operation, the titanium liquid is transported from the titanium liquid input pipe 1 to the inside of the spray tower 2, and is sprayed in the spray head by the spray head. During the spraying process, since the vacuum device 10 draws vacuum outward through the vacuum tube 9, water vapor will be drawn out in this process to quickly cool the titanium liquid. Then the titanium liquid enters the No. 1 crystallization chamber 3, and flows from the No. 1 crystallization chamber 3 to the No. 6 crystallization chamber 8. In each crystallization chamber, the temperature of the titanium liquid decreases due to the decrease in vacuum, and the crystallization continues. Finally, it is transported from the discharge pipe 15 to the crystallization titanium liquid tank 16; the crystallization titanium liquid in the crystallization titanium liquid tank 16 is transported from the crystallization titanium liquid pump to the filter for crystallization and separation of titanium dioxide and ferrous sulfate.

[0021] An inclined drainage plate is provided at the outlet of the spray tower 2 in the No. 1 crystallization chamber 3 to prevent the titanium liquid in the spray tower 2 from vertically falling into the No. 1 crystallization chamber 3 and causing the titanium liquid to splash, so that the titanium liquid can enter the No. 1 crystallization chamber 3 more smoothly and avoid excessive fluctuations that affect the crystallization process.

[0022] A condenser 12 is provided on the vacuum tube 9 corresponding to each crystallization chamber. A chilled water circulation pipe 19 is provided on the condenser 12. The condenser 12 is used to cool the water vapor in the vacuum tube 9 to control the vacuum degree.

[0023] According to the relationship between vacuum degree and temperature, a condenser 12 is provided on the vacuum tube 9 to adjust the vacuum degree. In actual use, the temperature of the chilled water introduced into the condensers 12 corresponding to the No. 1 crystallization chamber 3 to the No. 6 crystallization chamber 8 is controlled from high to low, that is, the temperature of the chilled water introduced into the condenser 12 corresponding to the No. 6 crystallization chamber 8 is the lowest, and the temperature of the chilled water introduced into the condenser 12 corresponding to the No. 1 crystallization chamber 3 is the highest. In this way, the vacuum degree of the No. 1 crystallization chamber 3 is the lowest, and the vacuum degree of the No. 6 crystallization chamber 8 is the highest.

[0024] Except for the first crystallization chamber 3 and the sixth crystallization chamber 8 , the bottom of the latter crystallization chamber is connected to the top of the former crystallization chamber through a reflux pipe 13 , and a reflux pump 14 is provided on the reflux pipe 13 .

[0025] Temperature sensors are provided in each crystallization chamber, and the vacuum degree and titanium liquid temperature in each crystallization chamber are pre-set process parameters. In actual operation, if the temperature of the titanium liquid in a certain crystallization chamber is higher than the set temperature parameter, the corresponding reflux pump 14 is started to reflux part of the titanium liquid in the crystallization chamber to the previous crystallization chamber to continue cooling the titanium liquid and continue crystallization. Specifically: Crystallization chamber No. 3 5 is connected to crystallization chamber No. 2 4 through a reflux pipe 13, that is, part of the titanium liquid in crystallization chamber No. 3 5 can be refluxed to crystallization chamber No. 2 4 when necessary; crystallization chamber No. 4 6 is connected to crystallization chamber No. 3 5 through a reflux pipe 13, and crystallization chamber No. 5 7 is connected to crystallization chamber No. 4 6 through a reflux pipe 13.

[0026] A stirring shaft 29 is provided in each crystallization chamber, and a stirring blade 27 is provided on the stirring shaft 29, and the stirring blade 27 is in contact with the bottom of the crystallization chamber. A motor 28 is provided outside the crystallization chamber, and the motor 28 drives the stirring shaft 29 to rotate. According to actual conditions, a stirring shaft 29 can be provided on each crystallization tank, and the stirring shaft 29 passes through the corresponding crystallization chamber. A stirring blade 27 is provided on the stirring shaft 29 in the corresponding crystallization chamber. The stirring blade 27 is used to scrape off the ferrous sulfate deposited at the bottom of the crystallization chamber, so that it flows to the next crystallization chamber together with the titanium liquid, and will not cause blockage. Of course, the stirring blade 27 can be spiral, with a forward thrust, to provide a forward thrust for the titanium liquid to flow, so that its flow between each crystallization chamber is smoother and more stable.

[0027] The chilled water circulation pipe 19 is connected in sequence to the condensers 12 corresponding to the No. 6 crystallization chamber 8 and the No. 1 crystallization chamber 3. The chilled water circulation pipe 19 is connected to the chilled water tank 20 through a chilled water pump 22. The chilled water pump 22 is arranged on the chilled water circulation pipe 19 at the chilled water inlet of the condenser 12 corresponding to the No. 6 crystallization chamber 8. An overflow trough 17 is arranged on the chilled water circulation pipe 19 below each condenser 12. An overflow pipe 26 is arranged on the overflow trough 17. The overflow pipe 26 is connected to the chilled water tank 20. A circulating water pump 18 is arranged between two adjacent condensers 12. The circulating water pump 18 is arranged on the chilled water circulation pipe 19 between the overflow trough 17 and the next condenser 12.

[0028] In order to reduce energy consumption and water resource utilization, the chilled water circulation pipe 19 is connected to six condensers 12 in sequence. Since the temperature required by the condenser 12 corresponding to the No. 1 crystallization chamber 3 is the highest and the temperature required by the condenser 12 corresponding to the No. 6 crystallization chamber 8 is the lowest, the chilled water is first used to enter the condenser 12 corresponding to the No. 6 crystallization chamber 8 for heat exchange, and the chilled water with the lowest temperature is used for the condenser 12, so that the vacuum degree in the No. 6 crystallization chamber 8 is the highest, and the temperature of the chilled water after heat exchange is increased, and then enters the condenser 12 corresponding to the No. 5 crystallization chamber 7 for heat exchange. At this time, the temperature in the condenser 12 corresponding to the No. 5 crystallization chamber 7 is higher than the temperature of the condenser 12 corresponding to the No. 6 crystallization chamber 8, so the vacuum degree of the No. 5 crystallization chamber 7 is lower than the vacuum degree of the No. 6 crystallization chamber 8; by analogy, the vacuum degree in the No. 1 crystallization chamber 3 is the lowest, generally controlled within the range of 6-8KPa, and the vacuum degree in the No. 6 crystallization chamber 8 is the highest, generally controlled within the range of 1-2KPa.

[0029] In the process of titanium liquid flowing from crystallization chamber No. 1 3 to crystallization chamber No. 6 8, since the vacuum degree of crystallization chamber No. 1 3 to crystallization chamber No. 6 8 gradually increases, the temperature of titanium liquid gradually decreases, and the degree of crystallization of ferrous sulfate gradually increases, and finally it is discharged from the discharge pipe 15 after meeting the required requirements.

[0030] The above process recycles the chilled water and reduces the use of water resources. At the same time, an overflow tank 17 is provided between adjacent condensers 12 to adjust the amount of chilled water entering the rear condenser 12 according to actual conditions, so as to control the cooling temperature of the corresponding condenser 12 and the vacuum degree of the corresponding crystallization chamber.

[0031] A heat exchanger 21 is provided in the freezing water tank 20 . The heat exchanger 21 forms a circulation with a chiller 23 through a water pump 24 . The chiller 23 forms a circulation with a cooling tower 25 through a water pump 24 .

[0032] The chilled water in the chilled water tank 20 can be cooled by the heat exchanger 21, and the cold source of the heat exchanger 21 is provided by the chiller 23. The cold source circulation between the chiller 23 and the heat exchanger 21 is realized by the water pump 24 to cool the chilled water in the chilled water tank 20. Since the energy consumption of the chiller 23 is relatively high, in order to save energy, a cooling tower 25 is used to form a cycle with the chiller 23. The cooling tower 25 dissipates heat from the medium in the chiller to reduce the temperature of the medium, and then enters the chiller 23 for cooling and then enters the heat exchanger 21 to cool the cooling water, which can reduce energy consumption. The chiller 23 and the cooling tower 25 are both existing known structures, and the cycle formed by the connection between the two is also an existing known technology, which will not be described in detail.

[0033] There are three vacuum devices 10, and a steam-water separator 11 is arranged upstream of each vacuum device 10, and each steam-water separator 11 is connected to two vacuum pipes 9. The vacuum pipes 9 corresponding to the No. 1 crystallization chamber 3 and the No. 2 crystallization chamber 4 are connected to the steam-water separator 11 in front of one of the vacuum devices 10, the vacuum pipes 9 of the No. 3 crystallization chamber 5 and the No. 4 crystallization chamber 6 are connected to the steam-water separator 11 in front of one vacuum device 10, and the vacuum pipes 9 of the No. 5 crystallization chamber 7 and the No. 6 crystallization chamber 8 are connected to the steam-water separator 11 in front of another vacuum device 10, and each vacuum device 10 acts on two crystallization chambers. Water vapor will be brought out during the vacuuming process, so the water will be removed in the steam-water separator 11. The vacuum device 10 and the steam-water separator 11 are both existing known technologies, and the specific structure will not be repeated.

[0034] A method for continuous crystallization of titanium liquid using the above-mentioned titanium liquid continuous crystallization device, wherein titanium liquid at 55-60°C is transported from a titanium liquid inlet pipe 1 to a spray tower 2, and sprayed in the spray tower 2; the titanium liquid after spraying enters the first crystallization chamber, and flows to the crystallization chamber at the end in turn, and is finally transported from a discharge pipe 15 to a crystallization titanium liquid tank 16; the vacuum degree of the first crystallization chamber is controlled at 6-8KPa, and the vacuum degree of the crystallization chamber at the end is controlled at 1-2KPa.

[0035] There are six crystallization chambers, and the crystallization chambers from the first crystallization chamber to the last are defined as: No. 1 crystallization chamber 3, No. 2 crystallization chamber 4, No. 3 crystallization chamber 5, No. 4 crystallization chamber 6, No. 5 crystallization chamber 7, and No. 6 crystallization chamber 8; the vacuum degree of No. 1 crystallization chamber 3 is 6-8KPa, and the titanium liquid temperature is greater than or equal to 42°C, the vacuum degree of No. 2 crystallization chamber 4 is 5-6KPa, and the titanium liquid temperature is 38-42°C, the vacuum degree of No. 3 crystallization chamber 5 is 3-4KPa, and the titanium liquid temperature is 33-3 8℃, the vacuum degree of crystallization chamber No. 4 6 is 3-4KPa, the temperature of titanium liquid is 28-33℃, the vacuum degree of crystallization chamber No. 5 7 is 2-3KPa, the temperature of titanium liquid is 23-28℃, the vacuum degree of crystallization chamber No. 6 8 is 1-2KPa, the temperature of titanium liquid is 18-23℃; when the temperature of titanium liquid in crystallization chamber No. 2 4, crystallization chamber No. 3 5, crystallization chamber No. 4 6, and crystallization chamber No. 5 7 is greater than the set temperature, the corresponding reflux pump 14 is started to reflux the titanium liquid to the previous crystallization chamber.

[0036] According to the range of the above process parameters, the specific implementation method is as follows:

[0037] The titanium liquid at 55℃, pressure of 0.45MPa and flow rate of 100m 3 / h is transported to the spray tower 2 through the titanium liquid input pipe 1, and is sprayed out from the spray head through multi-stage spraying. The chilled water inlet temperature of the condenser 12 corresponding to the No. 6 crystallization chamber 8 is controlled at 7°C. After heat exchange, the outlet water temperature of the condenser 12 corresponding to the No. 6 crystallization chamber 8 is 10°C. The chilled water is transported to the condenser 12 corresponding to the No. 5 crystallization chamber 7 through the circulating water pump 18 to cool the inside. After cooling, the outlet water temperature of the condenser 12 is 15°C; the 15°C chilled water is transported to the condenser 12 corresponding to the No. 4 crystallization chamber 6 through the circulating water pump 18 to cool the inside. After cooling, the outlet water temperature of the condenser 12 is 20°C; the 20°C chilled water is transported to the condenser 12 corresponding to the No. 3 crystallization chamber 5 through the circulating water pump 18. The corresponding condenser 12 is cooled, and the outlet water temperature of the condenser 12 after cooling is 25°C; the 25°C chilled water is transported to the condenser 12 corresponding to the No. 2 crystallization chamber 4 through the circulating water pump 18, and the interior is cooled. After cooling, the outlet water temperature of the condenser 12 is 30°C; the 30°C chilled water is transported to the condenser 12 corresponding to the No. 1 crystallization chamber 3 through the circulating water pump 18, and the interior is cooled. After cooling, the outlet water temperature of the condenser 12 is 35°C; the 35°C chilled water is returned to the chilled water tank 20. The 35°C chilled water is cooled to 7°C in the chilled water tank 20 through the heat exchanger 21.

[0038] Through the circulation of the above-mentioned chilled water, the vacuum degree of the No. 1 crystallization chamber 3 is 7KPa, at this time, the temperature of the titanium liquid in the No. 1 crystallization chamber 3 is 42°C, the vacuum degree of the No. 2 crystallization chamber 4 is 5.5KPa, the temperature of the titanium liquid in the No. 1 crystallization chamber 3 is 40°C, the vacuum degree of the No. 3 crystallization chamber 5 is 4KPa, the temperature of the titanium liquid in the No. 3 crystallization chamber 5 is 35°C, the vacuum degree of the No. 4 crystallization chamber 6 is 3KPa, the temperature of the titanium liquid in the No. 4 crystallization chamber 6 is 30°C, the vacuum degree of the No. 5 crystallization chamber 7 is 2.5KPa, the temperature of the titanium liquid in the No. 5 crystallization chamber 7 is 25°C, the vacuum degree of the No. 6 crystallization chamber 8 is 1.5KPa, and the temperature of the titanium liquid in the No. 6 crystallization chamber 8 is 20°C. Of course, in the actual working process, the vacuum degree and the temperature of the titanium liquid in each crystallization chamber will fluctuate within a small range. The start-up of the titanium liquid circulation pump is selected according to the actual setting. For example, the vacuum fluctuation range of each crystallization chamber is set to ±0.25KPa, and the temperature fluctuation of the titanium liquid is ±2.5℃. When the vacuum degree of a crystallization chamber exceeds the set value, it is necessary to control the amount of chilled water entering the condenser 12 corresponding to the crystallization chamber to change the cooling temperature and thus adjust the vacuum degree. When the titanium liquid temperature is higher than the set maximum value range, the corresponding titanium liquid circulation pump is started to return part of the titanium liquid to the previous crystallization chamber for cooling and crystallization again. The above process can ensure the stability of the continuous crystallization process.

[0039] The cooling water required for the vacuum device 10 during operation can also be provided from the freezing water tank 20 , and after cooling the vacuum device 10 , the cooling water flows back to the freezing water tank 20 for heat exchange and cooling.

[0040] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0041] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be an interactive relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simplified modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A titanium liquid continuous crystallization device, comprising a titanium liquid inlet pipe, characterized in that: It comprises at least two crystallization chambers connected in sequence, the bottoms of adjacent crystallization chambers are interconnected, a spray tower is arranged on the first crystallization chamber, the spray tower is connected to the first crystallization chamber, the titanium liquid input pipe is connected to the top of the spray tower and extends to the inside, a spray head is arranged on the titanium liquid input pipe inside the spray tower, a discharge pipe is arranged at the lower end of the terminal crystallization chamber, the discharge pipe is connected to a crystallization titanium liquid tank, a vacuum tube is arranged on the top of the spray tower on the first crystallization chamber, a vacuum tube is arranged on the top of the remaining crystallization chambers, the vacuum tube is connected to a vacuum device, the vacuum device is used to adjust the vacuum degree in each crystallization chamber, and the vacuum degree increases from the first crystallization chamber to the terminal crystallization chamber.

2. A titanium liquid continuous crystallization device according to claim 1, characterized in that: A condenser is provided on the vacuum tube corresponding to each crystallization chamber, and a chilled water circulation pipe is provided on the condenser. The condenser is used to cool the water vapor in the vacuum tube to control the vacuum degree.

3. A titanium liquid continuous crystallization device according to claim 1 or 2, characterized in that: The number of crystallization chambers is 4 or more. Except for the first crystallization chamber and the last crystallization chamber, two adjacent crystallization chambers are connected from the bottom of the latter crystallization chamber to the top of the former crystallization chamber through a reflux pipe, and a reflux pump is arranged on the reflux pipe.

4. A titanium liquid continuous crystallization device according to claim 3, characterized in that: A stirring shaft is arranged in each crystallization chamber, and a stirring blade is arranged on the stirring shaft. The stirring blade is in contact with the bottom of the crystallization chamber. A motor is arranged outside the crystallization chamber, and the motor drives the stirring shaft to rotate.

5. The titanium liquid continuous crystallization device according to claim 2, characterized in that: The chilled water circulation pipe is connected in sequence from the crystallization chamber at the end to the condenser corresponding to the first crystallization chamber. The chilled water circulation pipe is connected to the chilled water tank through a chilled water pump. The chilled water pump is arranged on the chilled water circulation pipe at the chilled water inlet of the condenser corresponding to the crystallization chamber at the end. An overflow trough is arranged on the chilled water circulation pipe under each condenser. An overflow pipe is arranged on the overflow trough. The overflow pipe is connected to the chilled water tank. A circulating water pump is arranged between two adjacent condensers. The circulating water pump is arranged on the chilled water circulation pipe between the overflow trough and the next condenser.

6. A titanium liquid continuous crystallization device according to claim 5, characterized in that: A heat exchanger is arranged in the refrigerated water tank, and the heat exchanger forms a circulation with the chiller through a water pump, and the chiller forms a circulation with the cooling tower through a water pump.

7. The titanium liquid continuous crystallization device according to claim 1 is characterized by: The number of the vacuum devices is one or more, a steam-water separator is arranged upstream of each vacuum device, and each steam-water separator is connected to one or more vacuum pipes.

8. A method for continuous crystallization of titanium liquid using the titanium liquid continuous crystallization device as claimed in claim 5, characterized in that: The titanium liquid at 55-60°C is transported from the titanium liquid inlet pipe to the spray tower and sprayed in the spray tower; the titanium liquid after spraying enters the first crystallization chamber, and flows to the crystallization chamber at the end in turn, and is finally transported from the discharge pipe to the crystallization titanium liquid tank; the vacuum degree of the first crystallization chamber is controlled at 6-8KPa, and the vacuum degree of the crystallization chamber at the end is controlled at 1-2KPa.

9. The method for continuous crystallization of titanium liquid according to claim 8, characterized in that: There are six crystallization chambers, and the crystallization chambers from the first crystallization chamber to the last crystallization chamber are defined as: crystallization chamber No. 1, crystallization chamber No. 2, crystallization chamber No. 3, crystallization chamber No. 4, crystallization chamber No. 5, and crystallization chamber No. 6; The vacuum degree of crystallization chamber No. 1 is 6-8KPa, and the temperature of titanium liquid is greater than or equal to 42°C, the vacuum degree of crystallization chamber No. 2 is 5-6KPa, and the temperature of titanium liquid is 38-42°C, the vacuum degree of crystallization chamber No. 3 is 3-4KPa, and the temperature of titanium liquid is 33-38°C, the vacuum degree of crystallization chamber No. 4 is 3-4KPa, and the temperature of titanium liquid is 28-33°C, the vacuum degree of crystallization chamber No. 5 is 2-3KPa, and the temperature of titanium liquid is 23-28°C, the vacuum degree of crystallization chamber No. 6 is 1-2KPa, and the temperature of titanium liquid is 18-23°C; when the temperature of titanium liquid in crystallization chamber No. 2, crystallization chamber No. 3, crystallization chamber No. 4, and crystallization chamber No. 5 is greater than the set temperature, the corresponding reflux pump is started to reflux the titanium liquid to the previous crystallization chamber.

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