Zinc sulfate crystallization device

Abstract

The utility model discloses a zinc sulfate crystallization device which comprises a box body, a base arranged at the bottom of the box body, a feed port arranged at the top of the box body, a feed pipe arranged at the feed port, a horizontal stirring tank arranged at the top in the box body, a stirring mechanism arranged in the stirring tank, and a double-layer jacket cavity arranged on the side wall of the stirring tank, high-temperature steam used for heating liquid in the stirring tank is arranged in the double-layer jacket cavity, a steam circulating inlet communicated with the double-layer jacket cavity is formed in the side wall of the top of one end of the stirring tank, a steam circulating outlet communicated with the double-layer jacket cavity is formed in the side wall of the top of the other end of the stirring tank, and a feeding port is formed in the top of the stirring tank and communicated with the lower end of a feeding pipe; a discharging opening is formed in the side wall of the bottom of the stirring tank and connected with a discharging pipe, a cooling box is arranged below the stirring tank, a liquid collecting groove is formed in the top of the cooling box, and a plurality of vertically-through liquid inlet holes are formed in the bottom of the liquid collecting groove. The device is high in heat exchange efficiency, high in zinc sulfate crystallization efficiency, high in crystallization precipitation rate, short in crystallization time and good in product quality.

Description

Technical Field

[0001] The utility model relates to the technical field of zinc sulfate production process equipment, in particular to a zinc sulfate crystallization device. Background Art

[0002] Zinc sulfate is an inorganic compound with the chemical formula ZnSO4, in the form of colorless or white crystals, granules or powder. Zinc sulfate is mainly used as a raw material for the preparation of pigments such as lithopone, lithopone and other zinc compounds. It is also used as a nutrient for animals with zinc deficiency, a feed additive for animal husbandry, zinc fertilizer (trace element fertilizer) for crops, an important material for artificial fibers, an electrolyte for the electrolytic production of metallic zinc, a mordant in the textile industry, a medical emetic, astringent, fungicide, and a wood and leather preservative.

[0003] At present, the method of zinc sulfate crystallization is to heat the zinc sulfate mother liquor, and then gradually absorb and remove the wet heat and crystallization heat of the cooled zinc sulfate solution by heat transfer through the jacket or the wall of the coil tube through the cooling medium (water). This traditional cooling crystallization method has low heat exchange efficiency, slow cooling crystallization speed, long time, low unit output, high cost, fine crystal particles, high adsorption of free water, and thus poor product quality. Utility Model Content

[0004] The utility model provides a zinc sulfate crystallization device, which solves the problems of low heat exchange efficiency, slow cooling crystallization speed, long time, small unit output, high cost, fine crystal particles and poor product quality in a traditional zinc sulfate crystallization method.

[0005] The utility model provides a zinc sulfate crystallization device, comprising a box body, a base is arranged at the bottom of the box body, a feed port is arranged at the top of the box body, a feed pipe is arranged at the feed port, a horizontal stirring tank is arranged at the top of the box body, a stirring mechanism is arranged in the stirring tank, a double-layer jacket cavity is arranged on the side wall of the stirring tank, high-temperature steam for heating the liquid in the stirring tank is arranged in the double-layer jacket cavity, a steam circulation inlet connected to the double-layer jacket cavity is arranged on the top side wall of one end of the stirring tank, a steam circulation outlet connected to the double-layer jacket cavity is arranged on the top side wall of the other end of the stirring tank, a feed port is arranged on the top of the stirring tank and is connected to the lower end of the feed pipe, a discharge port is arranged on the bottom side wall of the stirring tank and is connected to the discharge pipe, a cooling box is arranged below the stirring tank, a liquid collecting tank is arranged on the top of the cooling box, and a liquid collecting tank is arranged A plurality of liquid inlet holes which pass through the groove up and down are arranged at the bottom of the groove, a plurality of liquid discharge holes corresponding to the liquid inlet holes are arranged on the bottom plate of the cooling box, each liquid inlet hole is vertically connected to the corresponding liquid discharge hole through a cooling pipe, an air inlet is arranged on one side wall inside the cooling box, the outer end of the air inlet is connected to the air outlet of the air cooler arranged on the outer wall of the box body, an air outlet is arranged on the other side wall of the cooling box, a liquid collecting bucket is arranged at the bottom of the cooling box, a centrifugal cylinder is arranged below the liquid collecting bucket, a first motor is arranged below the centrifugal cylinder, the first motor is vertically fixed on the base, a disc is coaxially fixed on the output shaft of the first motor, the bottom of the centrifugal cylinder is fixed on the disc, an annular groove body is sleeved on the outside of the centrifugal cylinder, a liquid discharge port is arranged at the bottom of the annular groove body, an exhaust port is arranged on the top of the stirring tank and is connected to the exhaust pipe.

[0006] Furthermore, the discharge port of the liquid collecting hopper is connected to the discharge pipe, and electric control valves are arranged on the feed pipe, discharge pipe, discharge pipe and exhaust pipe.

[0007] Furthermore, a vertical suction pipe is arranged in the centrifugal cylinder, a suction head is arranged at the lower end of the suction pipe, the upper end of the suction pipe is connected to the vacuum suction machine outside the box through an air hose, and an electric push rod is arranged at the upper end of the suction pipe for driving the suction pipe to move up and down. The electric push rod is vertically fixed at the bottom of the liquid collecting bucket, and the telescopic end of the electric push rod is fixedly connected to the upper end of the suction pipe.

[0008] Furthermore, the stirring mechanism includes a stirring shaft, a second motor, and stirring blades. The stirring shaft is coaxially arranged in the stirring tank, one end of the stirring shaft extends to the outside of the stirring tank and is connected to the output shaft of the second motor arranged on the outer wall of the box body, and both ends of the stirring shaft are rotatably supported by shaft seats arranged on the side walls of both ends of the stirring tank, and multiple stirring blades are arranged on the stirring shaft along the axial direction.

[0009] Furthermore, the outer wall of the centrifugal cylinder is provided with filter holes in a circular array.

[0010] Furthermore, the liquid discharge port is connected to the feed pipe through a liquid delivery pipeline, and a booster pump is arranged on the feed pipe.

[0011] It can be seen from the above technical solutions that the utility model provides a zinc sulfate crystallization device.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The zinc sulfate solution is heated by a stirring tank, the heated and concentrated zinc sulfate solution is cooled and crystallized by a cooling box, and the separated crystalline zinc sulfate product is quickly collected by a suction pipe, which increases the heat exchange efficiency of zinc sulfate crystallization, and has fast cooling and crystallization speed, short time, high unit output, low cost, coarse crystal particles, and thus good product quality.

[0014] 2. The first motor drives the centrifugal cylinder to quickly separate the unsaturated liquid and the zinc sulfate crystal product in the cooled and crystallized zinc sulfate solution, thereby improving the zinc sulfate crystal separation efficiency.

[0015] 3. The unsaturated mother liquor of zinc sulfate obtained by centrifugal dehydration enters the liquid delivery pipeline, is pressurized by a booster pump, and quickly refluxes into the stirring tank to continue concentration, cooling and crystallization, thereby achieving continuous crystallization of zinc sulfate, with high crystallization rate and high product utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the utility model, the following is a brief introduction to the drawings required for use in the implementation cases. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 This is a schematic cross-sectional view of the overall structure of a zinc sulfate crystallization device proposed in the utility model;

[0018] Figure 2 The utility model is a partial structural cross-sectional schematic diagram of a zinc sulfate crystallization device proposed by the utility model.

[0019] In the figure:

[0020] 1-box; 11-feeding pipe;

[0021] 2- Base;

[0022] 3-cooling box; 31-double-layer jacket chamber; 32-steam circulation inlet; 33-steam circulation outlet; 34-discharging pipe; 35-stirring shaft; 36-second motor; 37-stirring blade;

[0023] 4-stirring mechanism; 41-liquid collecting tank; 42-air inlet; 43-air cooler; 44-air outlet; 411-liquid inlet hole; 412-liquid outlet hole; 413-cooling pipe;

[0024] 5-liquid collecting hopper; 50-electric control valve; 51-discharge pipe;

[0025] 6-centrifugal cylinder; 61-filter hole;

[0026] 7-first motor; 71-disc;

[0027] 8-annular tank body; 81-liquid discharge port; 82-liquid delivery pipeline; 83-boosting pump;

[0028] 9-suction pipe; 91-suction head; 92-gas hose; 93-electric push rod;

[0029] 10- Exhaust pipe. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0031] Embodiment 1:

[0032] See also Figure 1-2A zinc sulfate crystallization device comprises a box body 1, a base 2 is arranged at the bottom of the box body 1, a feed port is arranged at the top of the box body 1, a feed port is arranged at the feed port, a horizontal stirring tank 3 is arranged at the top of the box body 1, the stirring tank 3 is fixedly connected to the inner wall of the box body 1, a stirring mechanism is arranged in the stirring tank 3, the stirring mechanism is used to stir, evaporate and concentrate the zinc sulfate mother liquor in the stirring tank 3, a double-layer jacket cavity 31 is arranged on the side wall of the stirring tank 3, high-temperature steam for heating the liquid in the stirring tank 3 is arranged in the double-layer jacket cavity 31, a steam circulation inlet 32 ​​connected to the double-layer jacket cavity 31 is arranged on the top side wall of one end of the stirring tank 3, and the steam circulation inlet 32 ​​is connected to the double-layer jacket cavity 31. Steam is supplied through the boiler, a steam circulation outlet 33 connected to the double-layer jacket cavity 31 is arranged on the top side wall of the other end of the stirring tank 3, and the steam circulation outlet 33 is connected to the boiler, a feed port is arranged on the top of the stirring tank 3 and is connected and communicated with the lower end of the feed pipe 11, a discharge port is arranged on the bottom side wall of the stirring tank 3 and is connected to the discharge pipe 34, a cooling box 4 is arranged below the stirring tank 3, and the cooling box 4 is used to evaporate and concentrate the heated zinc sulfate mother liquor, a liquid collecting tank 41 is arranged on the top of the cooling box 4, and the liquid collecting tank 41 is used to collect the zinc sulfate mother liquor fully heated by the stirring tank 3, a plurality of liquid inlet holes 411 are arranged on the bottom of the liquid collecting tank 41, and the bottom of the cooling box 4 The plate is provided with a plurality of drainage holes 412 corresponding to the liquid inlet hole 411, each liquid inlet hole 411 is vertically connected and communicated with the corresponding drainage hole 412 through a cooling pipe 413, an air inlet 42 is provided on one side wall of the cooling box 4, and the outer end of the air inlet 42 is connected to the air outlet of a cooling fan 43 provided on the outer side wall of the box body 1, and an air outlet 44 is provided on the other side wall of the cooling box 4, and the zinc sulfate mother liquor in the cooling pipe 413 can be quickly cooled by the cooling fan 43 to increase the crystallization efficiency, a liquid collecting bucket 5 is provided at the bottom of the cooling box 4, a centrifugal cylinder 6 is provided below the liquid collecting bucket 5, a first motor 7 is provided below the centrifugal cylinder 6, and the first motor 7 is vertically connected to the cooling box 4. The first motor 7 is fixed on the base 2, and a disc 71 is coaxially fixed on the output shaft of the first motor 7. The bottom of the centrifugal cylinder 6 is fixed on the disc 71. An annular groove body 8 is sleeved on the outer side of the centrifugal cylinder 6. A discharge port 81 is arranged at the bottom of the annular groove body 8. An exhaust port is arranged on the top of the stirring tank 3 and is connected to an exhaust pipe 10. During the heat exchange process of the liquid in the stirring tank 3, it is necessary to open the exhaust pipe 10 to discharge the gas generated in the heat exchange process into the condenser for collection and recovery. The centrifugal cylinder 6 is driven to rotate by the first motor 7, so that the zinc sulfate crystal product in the centrifugal cylinder 6 can be quickly separated from the unsaturated liquid, and the unsaturated liquid can be quickly re-concentrated and crystallized.

[0033] In this embodiment, see Figure 1 The discharge port of the liquid collecting hopper 5 is connected to the discharge pipe 51, and the feed pipe 11, the discharge pipe 34, the discharge pipe 51, and the exhaust pipe 10 are all provided with an electric control valve 50, and the discharge pipe 51, the feed pipe 11, the discharge pipe 34, the discharge pipe 51, and the exhaust pipe 10 are opened and closed by the electric control valve 50.

[0034] In this embodiment, see Figure 1 A vertical suction pipe 9 is arranged in the centrifugal cylinder 6, a suction head 91 is arranged at the lower end of the suction pipe 9, the upper end of the suction pipe 9 is connected to the vacuum suction machine outside the box body 1 through an air hose 92, an electric push rod 93 is arranged at the upper end of the suction pipe 9 for driving the suction pipe 9 to move up and down, the electric push rod 93 is vertically fixed at the bottom of the liquid collecting bucket 5, the telescopic end of the electric push rod 93 is fixedly connected to the upper end of the suction pipe 9, and the negative pressure suction force is provided by the vacuum suction machine, and the suction head 91 on the suction pipe 9 is driven by the electric push rod 93 to extend into the centrifugal cylinder 6 to facilitate the rapid suction and collection of the crystallized product.

[0035] In this embodiment, see Figure 1 , 2 The stirring mechanism includes a stirring shaft 35, a second motor 36, and a stirring blade 37. The stirring shaft 35 is coaxially rotatable and arranged in the stirring tank 3. One end of the stirring shaft 35 extends to the outside of the stirring tank 3 and is connected to the output shaft of the second motor 36 arranged on the outer wall of the box body 1. Both ends of the stirring shaft 35 are rotatably supported by shaft seats arranged on the side walls of both ends of the stirring tank 3. A plurality of stirring blades 37 are arranged on the stirring shaft 35 along the axial direction. The stirring shaft 35 is driven to rotate by the second motor 36, and the stirring blades 37 are driven to stir the liquid in the stirring tank 3, so that the liquid in the stirring tank 3 can be efficiently heat exchanged with the high-temperature steam in the double-layer jacket cavity 31, which is convenient for the liquid in the stirring tank 3 to be evenly heated and concentrated, thereby improving the heat exchange efficiency of the product.

[0036] In this embodiment, see Figure 1 The outer wall of the centrifugal cylinder 6 is provided with a circular array of filter holes 61. During the rotation of the centrifugal cylinder 6, the unsaturated liquid passes through the filter holes 61 under the action of centrifugal force, and the crystallized product is retained in the centrifugal cylinder 6, thereby achieving rapid separation of the unsaturated liquid and the crystallized product.

[0037] In this embodiment, see Figure 1 The discharge port 81 is connected to the feed pipe 11 through a liquid delivery pipe 82. A booster pump 83 is provided on the feed pipe 11. The booster pump 83 allows the unsaturated liquid discharged from the discharge port 81 to quickly enter the stirring tank 3 to continue concentration and crystallization.

[0038] It can be seen from the above technical scheme that when in use, the zinc sulfate solution is first added into the stirring tank 3 from the feed pipe 11 of the feed port, and then the electric control valve 50 on the feed pipe 11 is closed, and high-temperature steam is introduced into the double-layer jacket chamber 31 of the stirring tank 3 through the electric boiler, and the stirring shaft 35 is driven to rotate by the second motor 36 to drive the stirring blade 37 to stir the liquid in the stirring tank 3, so that the liquid in the stirring tank 3 can be efficiently heat-exchanged with the high-temperature steam in the double-layer jacket chamber 31, so that the liquid in the stirring tank 3 is uniformly heated and concentrated, and the zinc sulfate solution is evaporated and concentrated to 60-62 degrees Baume. After a small amount of monohydrate crystals appear and the temperature is about 100°C-103°C, the electric control valve 50 on the discharge pipe 34 is opened to discharge the zinc sulfate solution into the collecting tank 41, and the zinc sulfate solution in the collecting tank 41 enters the cooling pipe 413 through the liquid inlet hole 411, and then is discharged into the collecting bucket 5 from the discharge hole 412. The liquid in the collecting bucket 5 accumulates and the liquid level rises, so that the cooling The cooling tube 413 is filled with liquid. The zinc sulfate mother liquor in the cooling tube 413 is quickly cooled by starting the air cooler 43, so that the liquid in the cooling tube 413 and the zinc sulfate liquid in the liquid collecting bucket 5 are cooled. After the temperature of the saturated zinc sulfate solution is 33° C.-35° C., the electric control valve 50 on the discharge pipe 51 is opened to discharge the saturated zinc sulfate solution cooled to below 30° C. into the centrifugal cylinder 6. The first motor 7 is controlled by the controller to drive the centrifugal cylinder 6 to rotate, and zinc sulfate heptahydrate is separated. The unsaturated zinc sulfate solution passes through the filter hole 61 and enters the annular tank 8. The zinc sulfate crystal product is provided with negative pressure suction by the vacuum suction machine, and the suction head 91 on the suction pipe 9 is driven by the electric push rod 93 to extend into the centrifugal cylinder 6 to facilitate the rapid suction and collection of the crystal product. The unsaturated zinc sulfate mother liquor obtained by centrifugal dehydration enters the liquid delivery pipeline 82, is pressurized by the booster pump 83, and quickly refluxes into the stirring tank 3 to continue to be concentrated, cooled and crystallized.

[0039] Those skilled in the art will readily come up with other embodiments of the present invention after considering the specification and practicing the utility model disclosed herein. The present invention is intended to cover any variation, use or adaptation of the present invention, which follows the general principles of the present invention and includes common knowledge or customary technical means in the art that are not disclosed in the present invention. The specification and examples are to be regarded as exemplary only, and the true scope of the present invention is indicated by the claims.

[0040] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The above-described embodiments of the present invention do not constitute a limitation on the scope of protection of the present invention.

Claims

1. A zinc sulfate crystallization device, characterized in that: The invention comprises a box body (1), a base (2) is arranged at the bottom of the box body (1), a feed port is arranged at the top of the box body (1), a feed pipe (11) is arranged at the feed port, a horizontal stirring tank (3) is arranged at the top of the box body (1), a stirring mechanism is arranged in the stirring tank (3), a double-layer jacket cavity (31) is arranged on the side wall of the stirring tank (3), high-temperature steam for heating the liquid in the stirring tank (3) is arranged in the double-layer jacket cavity (31), and a steam source connected to the double-layer jacket cavity (31) is arranged on the top side wall of one end of the stirring tank (3). A steam circulation inlet (32) is provided at the top side wall of the other end of the stirring tank (3), and the steam circulation outlet (33) is connected to the double-layer jacket cavity (31). A feed port is provided at the top of the stirring tank (3) and is connected to the lower end of the feed pipe (11). A discharge port is provided at the bottom side wall of the stirring tank (3) and is connected to the discharge pipe (34). A cooling box (4) is provided below the stirring tank (3). A liquid collecting tank (41) is provided at the top of the cooling box (4). A plurality of liquid inlet holes (411) are provided at the bottom of the liquid collecting tank (41). The bottom plate of the cooling box (4) is provided with a plurality of liquid discharge holes (412) corresponding to the liquid inlet hole (411), each liquid inlet hole (411) is vertically connected to the corresponding liquid discharge hole (412) through a cooling pipe (413), an air inlet (42) is provided on one side wall of the cooling box (4), the outer end of the air inlet (42) is connected to the air outlet of a cooling fan (43) provided on the outer side wall of the box body (1), an air outlet (44) is provided on the other side wall of the cooling box (4), and a liquid collecting hopper (5) is provided at the bottom of the cooling box (4). (5), a centrifugal cylinder (6) is arranged below the liquid collecting hopper (5), a first motor (7) is arranged below the centrifugal cylinder (6), the first motor (7) is vertically fixed on the base (2), a disc (71) is coaxially fixed on the output shaft of the first motor (7), the bottom of the centrifugal cylinder (6) is fixed on the disc (71), an annular groove (8) is sleeved on the outer side of the centrifugal cylinder (6), a liquid discharge port (81) is arranged at the bottom of the annular groove (8), and an exhaust port is arranged at the top of the stirring tank (3) and is connected to an exhaust pipe (10).

2. A zinc sulfate crystallization device according to claim 1, characterized in that, The discharge port of the liquid collecting hopper (5) is connected to a discharge pipe (51), and an electric control valve (50) is provided on the feed pipe (11), the discharge pipe (34), the discharge pipe (51), and the exhaust pipe (10).

3. A zinc sulfate crystallization device according to claim 1, characterized in that, A vertical suction pipe (9) is arranged in the centrifugal cylinder (6), a suction head (91) is arranged at the lower end of the suction pipe (9), the upper end of the suction pipe (9) is connected to a vacuum suction machine outside the box (1) through an air hose (92), an electric push rod (93) is arranged at the upper end of the suction pipe (9) for driving the suction pipe (9) to move up and down, the electric push rod (93) is vertically fixed at the bottom of the liquid collecting hopper (5), and the telescopic end of the electric push rod (93) is fixedly connected to the upper end of the suction pipe (9).

4. A zinc sulfate crystallization device according to claim 1, characterized in that, The stirring mechanism comprises a stirring shaft (35), a second motor (36), and stirring blades (37); the stirring shaft (35) is coaxially rotatably arranged in the stirring tank (3); one end of the stirring shaft (35) extends to the outside of the stirring tank (3) and is connected to the output shaft of the second motor (36) arranged on the outer wall of the box body (1); both ends of the stirring shaft (35) are rotatably supported by shaft seats arranged on the side walls of both ends of the stirring tank (3); and a plurality of stirring blades (37) are arranged on the stirring shaft (35) along the axial direction.

5. A zinc sulfate crystallization device according to claim 1, characterized in that, The outer wall of the centrifugal cylinder (6) is provided with filtering holes (61) in a circular array.

6. A zinc sulfate crystallization device according to claim 1, characterized in that, The liquid discharge port (81) is connected to the feed pipe (11) via a liquid delivery pipeline (82), and a booster pump (83) is provided on the feed pipe (11).

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