CN209740738U - Acidolysis system for producing anatase titanium dioxide - Google Patents
Acidolysis system for producing anatase titanium dioxide Download PDFInfo
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- CN209740738U CN209740738U CN201920043008.4U CN201920043008U CN209740738U CN 209740738 U CN209740738 U CN 209740738U CN 201920043008 U CN201920043008 U CN 201920043008U CN 209740738 U CN209740738 U CN 209740738U
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Abstract
The utility model discloses an acidolysis system for producing anatase titanium dioxide, comprising a premixing tank, a continuous acidolysis tank and a dissolving device, wherein the premixing tank is used for uniformly mixing sulfuric acid with crushed titanium concentrate and slag, the continuous acidolysis tank is connected with the premixing tank, the dissolving device is connected with the continuous acidolysis tank, and the dissolving device is used for receiving products after acidolysis in the continuous acidolysis tank and dissolving the products; delivering the dissolved titanium liquid to a settling tank through a pump for settling. The utility model discloses an acidolysis system, it sets up single premixing device, simple structure, convenient operation, and can realize the homogeneous mixing of acid mine the very first time, guarantees the continuity of acidolysis process, and premixing device is difficult for the bonding material on the long-term stirring in-process premixing groove inner wall simultaneously, has reduced washing and cost of maintenance.
Description
Technical Field
The utility model relates to a titanium white powder production field, especially an acidolysis system of production anatase titanium white powder.
Background
in the process of producing anatase titanium dioxide by a sulfuric acid method, titanium concentrate and titanium slag are generally mixed and crushed, then subjected to procedures of acidolysis, hydrolysis, salt treatment and the like to generate metatitanic acid, then calcined at high temperature in an acidolysis system to convert the metatitanic acid into titanium dioxide to obtain an anatase titanium dioxide primary product, and finally crushed and packaged to obtain an anatase titanium dioxide finished product. At present, a large-scale acid-resistant ceramic tile acidolysis tank is usually adopted in the acidolysis process for producing titanium dioxide, mineral powder and concentrated sulfuric acid are mixed and then subjected to acidolysis reaction in the acidolysis tank, and in order to ensure the acidolysis continuity and improve the acidolysis rate, the concentrated sulfuric acid and the mineral powder are usually mixed before acidolysis, and then the acidolysis reaction is carried out; common titanium dioxide products mainly comprise anatase and rutile, wherein in the acidolysis process of anatase titanium dioxide production, in order to improve the acidolysis rate and the generation rate of anatase titanium dioxide primary products in subsequent procedures, the temperature of acidolysis reaction and the sulfuric acid concentration need to be strictly controlled.
In the prior patent, the application number is 201510261343.8, and the application date is 2015.05.21, a titanium dioxide continuous acidolysis method and a mineral acid premixing tank and a reactor feeding tank are disclosed, wherein the titanium concentrate mineral powder sulfuric acid is metered at first, then is conveyed to the mineral acid premixing tank for metering and mixing, then is further mixed by the reactor feeding tank and then is conveyed to a continuous acidolysis tank for acidolysis, and finally, a product after acidolysis is dissolved and then is conveyed to a settling tank. The acid ore mixing equipment is divided into two parts, so that the equipment cost is increased although the volume of the equipment is reduced, the whole acidolysis process is more complicated, and the subsequent maintenance cost is increased; meanwhile, the sulfuric acid inlet and the sulfuric acid outlet of the mineral acid premixing tank are arranged at the bottom of the tank so as to facilitate calculation and adjustment of the usage amount, but the sulfuric acid inlet arranged at the bottom can influence the mixing effect of acid ores in the premixing tank, so that the acid ores are not uniformly mixed at the first time, acid liquid is easily excessively accumulated in mineral powder, the subsequent stirring and mixing effect is influenced, the acidolysis continuity is influenced, and scaling is easily generated for a long time to cause blockage, and the cleaning and maintenance cost is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: to the problem that exists, provide an acidolysis system of production anatase titanium white powder, it sets up single premixing device, simple structure, convenient operation, and can realize the homogeneous mixing of acid mine the very first time, guarantee the continuity of acidolysis process, and the premixing device is difficult for the material that bonds on long-term stirring in-process premixing inslot wall simultaneously, has reduced washing and cost of maintenance.
The utility model adopts the technical scheme as follows:
The utility model discloses an acidolysis system of production anatase titanium white powder, include: the system comprises a premixing tank, a feed inlet, an acid liquor spraying pipe, a first stirring unit and a discharge outlet, wherein the premixing tank is used for uniformly mixing sulfuric acid with crushed titanium concentrate and slag; the continuous acidolysis tank is connected with the premixing tank, a slurry conveying pump is arranged between the continuous acidolysis tank and the premixing tank, and the slurry conveying pump conveys the premixed materials into the continuous acidolysis tank for acidolysis; the dissolving device is connected with the continuous acidolysis tank, a second stirring unit is arranged in the dissolving device, and the dissolving device is used for receiving and dissolving a product after acidolysis in the continuous acidolysis tank; delivering the dissolved titanium liquid to a settling tank through a pump for settling.
Furthermore, a feeding port of the premixing tank is formed in the top of the premixing tank, a discharging port of the premixing tank is formed in the bottom of the premixing tank, a mineral powder storage tank is arranged above the premixing tank, and a discharging port of the mineral powder storage tank is communicated with the feeding port of the premixing tank.
Furthermore, a pulse dust collector is further arranged above the premixing tank, and a draught fan is installed on the pulse dust collector.
Furthermore, the acid liquor spraying pipe of the premixing groove is an annular pipeline, and a plurality of small holes are formed in the annular pipeline along the annular direction.
Further, first stirring unit is the spiral stirring structure, the spiral stirring structure includes puddler, spiral stirring piece and motor, the motor sets up in premixing groove top, the motor is connected with the puddler, install the spiral stirring piece on the puddler.
Further, a distributor is arranged above the continuous acidolysis tank and used for controlling the amount of mineral powder, waste acid and iron powder added into the continuous acidolysis tank.
Further, a spiral stirrer is arranged inside the continuous acidolysis tank.
Further, the dissolving device comprises a first dissolving tank and a second dissolving tank, the first dissolving tank and the second dissolving tank are connected in parallel, and titanium liquid dissolved in the first dissolving tank and the second dissolving tank is gathered together and conveyed to the settling device through a pump.
furthermore, cooling water pipelines are connected to the side walls of the premixing tank, the first dissolving tank and the second dissolving tank.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. The utility model discloses an acidolysis system, the ilmenite concentrate after smashing mixes through the premixing groove earlier with slay, and inside adoption of premixing groove sprays and adds sour, the spiral stirring has guaranteed the acid mine misce bene to guaranteed the continuity of follow-up acidolysis process, the acidolysis rate can reach 98%.
2. Compared with the prior art, the utility model discloses an acidolysis system sets up single premixing device, simple structure, convenient operation, and can realize the homogeneous mixing of acid mine the very first time, guarantees the continuity of acidolysis process, and premixing device is difficult for the bonding material on the long-term stirring in-process premixing groove inner wall simultaneously, has reduced washing and cost of maintenance.
Drawings
FIG. 1 is a schematic diagram of the acidolysis system of the present invention;
FIG. 2 is a schematic diagram of the premix tank of FIG. 1;
FIG. 3 is a schematic view of the structure of the dispersion disc of FIG. 2;
Fig. 4 is a top view of the shower of fig. 2.
The labels in the figure are: the method comprises the following steps of 1-a spiral conveyor, 2-a mineral powder storage tank, 3-a balance pipe, 4-a dispersion disc, 5-a motor, 6-a pulse dust collector, 7-an acid liquor spray pipe, 8-a valve, 9-a premixing tank, 10-a discharge port, 11-a stirring rod and 12-a spiral stirring sheet.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
in order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in fig. 1-2, the utility model discloses a production anatase titanium white's acidolysis system, include:
The mineral powder mixing device comprises a premixing tank, an acid liquid spraying pipe 7, a first stirring unit and a discharge port 10, wherein the feeding port is formed in the top of the premixing tank and facilitates discharging of mineral powder, the discharge port 10 is formed in the bottom of the premixing tank and facilitates discharging of a mixture, the acid liquid spraying pipe 7 is arranged at the lower end of the feeding port and facilitates spraying of acid liquid onto the mineral powder, the first stirring unit is arranged at the bottom of the acid liquid spraying pipe and facilitates stirring of the acid liquid and the mineral powder at the first time to enable the acid liquid and the mineral powder to be mixed uniformly, the finally mixed material is discharged through the discharge port, and a valve is arranged at the bottom end of the discharge port and;
The mixture of sulfuric acid and mineral powder is subjected to acidolysis reaction in the continuous acidolysis tank, and finally, titanium-containing solid-phase substances in the mineral powder are converted into leachable products mainly comprising titanyl sulfate and titanium sulfate, so that the subsequent preparation of anatase titanium dioxide is facilitated; the continuous acidolysis tank is connected with the premixing tank through a pipeline, a slurry conveying pump is arranged on the pipeline, and the slurry conveying pump conveys the premixed materials into the continuous acidolysis tank for acidolysis;
dissolving device, dissolving device is connected with the acidolysis jar in succession, be provided with second stirring unit in the dissolving device, second stirring unit includes energy supply motor, dwang and upper and lower two-layer stirring vane, thereby drives the dwang through the energy supply motor and rotates and drive the stirring vane stirring, makes acidolysis reaction product dissolve fast. Further, dissolving device includes first dissolving tank and second dissolving tank, first dissolving tank and second dissolving tank are parallelly connected, and parallelly connected the setting can guarantee that the acidolysis result dissolves simultaneously and leaches, guarantees the continuity of acidolysis, and titanium liquid after dissolving in first dissolving tank and the second dissolving tank gathers together through the pipe connection, and the pump is at last carried to the settlement device through the pump and is subsided.
As a preferred embodiment, a mineral powder storage tank 2 is arranged above the premixing tank, and a discharge port of the mineral powder storage tank 2 is communicated with a feed port of the premixing tank. Further, a material distribution structure is arranged at the bottom of the mineral powder storage structure 2 and used for dispersing mineral powder entering the interior of the premixing groove, so that mineral powder agglomeration is avoided, uniform mixing of the mineral powder and acid is guaranteed, and continuous blanking operation is realized; the top of the mineral powder storage structure 2 is provided with a balance structure, the balance structure is used for balancing the air pressure inside the mineral powder storage structure 2, negative pressure generated in the mineral powder falling process is avoided, the blanking speed is influenced, the balance structure comprises a plurality of hollow balance pipes 3, the balance pipes 3 vertically stretch into the mineral powder storage structure 2, the balance pipes are communicated with the mineral powder storage structure and the outside, air circulation can be kept in the mineral powder storage structure, the air pressure can be kept balanced, the negative pressure caused by air reduction in the mineral powder storage tank in the blanking process is avoided, and the blanking speed is limited. Preferably, in order to keep a good effect of balancing the air pressure, the diameter of the balancing pipe is 8-12 mm.
As shown in fig. 3, the material distributing structure includes a dispersing plate 4, the dispersing plate 4 is a circular ring structure, and a plurality of brackets are installed inside the circular ring structure in a staggered manner. The circular ring structure is divided into a plurality of parts by the plurality of supports, so that mineral powder can be dispersed by the plurality of parts when passing through the dispersion disc, and the mineral powder is prevented from accumulating into clusters to influence the mixing effect with acid; preferably, the bracket and the circular ring structure are both made of acid-resistant and impact-resistant materials, the bracket can be connected to the circular ring structure by welding or bonding, but not limited to welding and bonding, and the circular ring structure can also be fixed at the discharge port at the bottom of the mineral powder storage structure by welding or bonding, but not limited to welding and bonding.
As a preferred embodiment, in order to mix the acid solution and the mineral powder more quickly and uniformly, the first stirring unit inside the pre-mixing tank is a spiral stirring structure, the spiral stirring structure includes a stirring rod 11, a spiral stirring piece 12 and a motor 5, the motor 5 is disposed above the pre-mixing tank 9, the motor 5 is connected to the stirring rod 11, the spiral stirring piece 12 is fixedly mounted on the stirring rod 11, the motor 5 can drive the stirring rod 11 to rotate, and the stirring rod 11 can drive the spiral stirring piece 12 to rotate, so as to achieve a stirring operation.
As a preferred embodiment, a pulse dust collector 6 is further arranged above the premixing tank 9, and an induced draft fan is mounted on the pulse dust collector 6. The induced draft fan is started before blanking, so that the interior of the premixing tank can be kept in a negative pressure state, and dust in the blanking process can be pumped to the pulse cloth bag by the induced draft fan, so that the problem of dust pollution in the mineral powder blanking process is thoroughly solved; meanwhile, the induced draft fan can timely draw away dust in the premixing tank, scaling can be prevented to a certain extent, the negative pressure state in the premixing tank is kept, meanwhile, dust in the ore discharging process is drawn away to the pulse cloth bag, the pulse can be started after a certain amount of dust is accumulated, mineral powder on the cloth bag is shaken into the premixing tank, premixing operation is carried out, and the induced draft fan is turned off after discharging is finished.
as shown in fig. 4, the acid solution spray pipe 7 of the pre-mixing tank is an annular pipe, and preferably, the diameter of the annular pipe is 90 mm; furthermore, the annular pipeline is provided with a plurality of small holes along the annular direction, the small holes are distributed on the annular pipeline at equal intervals, the preferred hole distance is 9-12cm, the hole diameters of the small holes are 7-8mm, and the acid release speed is controlled to be 16-19 minutes. Preferably, the small holes formed in the annular direction are mainly distributed at the bottom and the side edges, sulfuric acid sprayed from the small holes distributed at the bottom and the side edges can be fully mixed with mineral powder, part of the mineral powder on the inner wall of the premixing groove can be washed away by the holes at the outer side, the holes at the inner side can be sprayed on the mineral powder in an all-around manner, and the sulfuric acid and the mineral powder can be mixed more uniformly while dust is reduced.
Example 2
Based on the above example 1, as shown in fig. 1, a distributor for controlling the amount of ore powder, waste acid, and iron powder charged into the continuous acidolysis tank is provided above the continuous acidolysis tank. A certain amount of waste acid can be added into the continuous acidolysis tank for dilution, and then a part of heat can be released, so that the acidolysis reaction can be started; the adding amount of waste acid is strictly controlled by a distributor before acidolysis, the sulfuric acid concentration reaches 84-88% after the waste acid is added to ensure that the acidolysis reaction is completely carried out, and the adding amount of iron powder is determined by measuring the content of trivalent titanium in the titanium solution to be 2.5-4 g/L.
as a preferred embodiment, a spiral stirrer is arranged in the continuous acidolysis tank, the spiral stirrer is used for stirring to promote the mineral powder to be aged in the acidolysis process, and the aged product reaches two ends of the reactor through spiral pushing so that the solid phase of the product is discharged at a certain speed and then enters the dissolving device. The spiral stirrer spans the continuous acidolysis tank to ensure sufficient stirring and material pushing, thereby realizing the processes of continuous feeding, continuous reaction and continuous discharging.
Further, the side wall of the groove body of the premixing groove is connected with a cooling water pipeline so as to control the mixing temperature in the premixing groove; the side walls of the first dissolving tank and the second dissolving tank are also connected with cooling water pipelines, so that the dissolving temperature of solid-phase substances can be conveniently adjusted; the cooling water is chilled water.
Example 3
Based on the above examples 1 and 2, the acidolysis system was operated as follows:
Conveying the crushed titanium concentrate and slag to a mineral powder storage tank 2 through a spiral conveyor 1, dispersing the mineral powder in a dispersion disc of the mineral powder storage tank 2, then dropping the dispersed mineral powder into a premixing tank, opening a pipeline valve 8 of an acid liquid spraying pipe 7, spraying acid liquid onto the mineral powder by the spraying pipe, starting a first stirring unit, stirring and mixing the acid liquid and the mineral powder while spraying the acid liquid, wherein in order to ensure complete acidolysis of the mineral powder, the preferable acid-mineral ratio is 1.54-1.65, and the sulfuric acid concentration is 92%; after acid ores are premixed uniformly, a discharge port of a premixing tank is opened, the acid ores are conveyed into a continuous acidolysis tank at the speed of 10m3/h by a slurry conveying pump, iron powder and a certain amount of waste acid are distributed and added through a distributor, the waste acid can dilute acid in the ore pulp to enable the concentration of the acid liquor to reach 84% -88%, certain heat is released, the ore powder and the sulfuric acid react under the initiation of the waste acid to enable most metal oxides in the ore powder to be decomposed to form sulfate, titanium dioxide in the titanium concentrate is decomposed to form titanyl sulfate (as a main component) and titanium sulfate, the acidolysis reaction is an exothermic reaction, and the heat released by the reaction can further promote the acidolysis reaction of reactants. The reaction materials are solidified into powdery substances within about 4 minutes, the powdery substances are slowly cured under the stirring of a spiral stirrer until reaching two ends of the reactor, then the powdery substances enter a first dissolving tank and a second dissolving tank respectively to be added with water and stirred for dissolving, and the dissolved titanium liquid is pumped to a settling section.
the above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The utility model provides an acidolysis system of production anatase titanium white powder which characterized in that includes:
The system comprises a premixing tank, a feed inlet, an acid liquor spraying pipe (7), a first stirring unit and a discharge outlet (10), wherein the premixing tank is used for uniformly mixing sulfuric acid with crushed titanium concentrate and slag;
The continuous acidolysis tank is connected with the premixing tank, a slurry conveying pump is arranged between the continuous acidolysis tank and the premixing tank, and the slurry conveying pump conveys the premixed materials into the continuous acidolysis tank for acidolysis;
The dissolving device is connected with the continuous acidolysis tank, a second stirring unit is arranged in the dissolving device, and the dissolving device is used for receiving and dissolving a product after acidolysis in the continuous acidolysis tank; delivering the dissolved titanium liquid to a settling tank through a pump for settling.
2. The acidolysis system for producing anatase titanium dioxide according to claim 1, wherein the feeding port of the pre-mixing tank is arranged at the top of the pre-mixing tank, the discharging port (10) is arranged at the bottom of the pre-mixing tank, a mineral powder storage tank (2) is arranged above the pre-mixing tank, and the discharging port of the mineral powder storage tank (2) is communicated with the feeding port of the pre-mixing tank.
3. The acidolysis system for producing anatase titanium dioxide according to claim 1, wherein a pulse dust collector (6) is further arranged above the pre-mixing tank (9), and an induced draft fan is installed on the pulse dust collector (6).
4. the acidolysis system for producing anatase titanium dioxide according to claim 1, wherein the acid solution spray pipe (7) of the pre-mixing tank is an annular pipe, and the annular pipe is provided with a plurality of small holes along the annular direction.
5. The acidolysis system for producing anatase titanium dioxide according to claim 1, wherein the first stirring unit is a spiral stirring structure, the spiral stirring structure comprises a stirring rod (11), a spiral stirring blade (12) and a motor (5), the motor (5) is disposed above the premixing tank (9), the motor (5) is connected with the stirring rod (11), and the spiral stirring blade (12) is mounted on the stirring rod (11).
6. the acidolysis system for producing anatase titanium dioxide according to claim 1, wherein a distributor is provided above the continuous acidolysis tank for controlling the amount of the ore powder, waste acid and iron powder added into the continuous acidolysis tank.
7. the acidolysis system for producing anatase titanium dioxide according to claim 1, wherein a spiral stirrer is installed inside the continuous acidolysis tank, the spiral stirrer stirs during acidolysis to promote mineral powder ripening, the ripened product reaches two ends of the reactor, enters the dissolution device to be stirred and dissolved, and is transported to the sedimentation device by a pump to be settled after dissolution.
8. The acidolysis system for producing anatase titanium dioxide according to claim 1, wherein the dissolving device comprises a first dissolving tank and a second dissolving tank, the first dissolving tank and the second dissolving tank are connected in parallel, and the titanium liquids dissolved in the first dissolving tank and the second dissolving tank are gathered together and conveyed to the settling device through a pump.
9. The acidolysis system for producing anatase titanium dioxide according to claim 1, wherein the side walls of the pre-mixing tank, the first dissolving tank and the second dissolving tank are connected with cooling water pipes.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111717933A (en) * | 2020-06-29 | 2020-09-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Reduce rutile type TiO in titanium slag2Titanium slag rapid cooling system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111717933A (en) * | 2020-06-29 | 2020-09-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Reduce rutile type TiO in titanium slag2Titanium slag rapid cooling system and method |
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