Aluminum sulfate preparation system

Abstract

An aluminum sulfate preparation system comprises a concentrated sulfuric acid storage tank, a tap water storage tank, an aluminum hydroxide batching tank and an aluminum sulfate reaction kettle, a sulfuric acid outlet of the concentrated sulfuric acid storage tank is connected into the aluminum sulfate reaction kettle, and a tap water outlet of the tap water storage tank is connected into the aluminum hydroxide batching tank and the aluminum sulfate reaction kettle. Solid aluminum hydroxide is weighed and then put into an aluminum hydroxide batching tank to be mixed with tap water to form aluminum hydroxide slurry with certain concentration, a slurry outlet of the aluminum hydroxide batching tank is connected into an aluminum sulfate reaction kettle, the upper part of the aluminum sulfate reaction kettle is connected with a tail gas absorption device, and the lower part is connected with an aluminum sulfate crystallization device. Compared with the prior art, supply of raw materials can be accurately controlled, the raw materials are fully reacted in the reaction kettle through regular stirring of the aluminum hydroxide batching tank and the stirrer in the aluminum sulfate reaction kettle, and the production efficiency and the purity of products are improved by controlling the temperature and the pressure in the reaction kettle; the kettle body can resist sulfuric acid corrosion, and the maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to aluminum sulfate chemical preparation technical field, especially a kind of aluminum sulfate preparation system. BACKGROUND

[0002] In chemical industry, aluminum sulfate becomes essential raw agent in water treatment, papermaking, daily chemical field with its excellent flocculation, acidity and complexing ability, with the promotion of environmental protection and fine demand, its high-purity, low-pollution preparation process and new application will be the key direction of future development, the problems in the preparation of aluminum sulfate involve raw material, reaction condition, post-processing, environmental protection, equipment, safety and many other aspects, need to consider optimizing process comprehensively, there is raw material purity in existing aluminum sulfate preparation process It is not pure, affect product purity, reaction condition control force is not enough, sulfuric acid concentration and temperature are improper and lead to side reaction or violent heat release, reaction is not complete and leads to byproduct, sulfuric acid corrosion reaction kettle, not only affect production efficiency, also increase equipment maintenance cost. CONTENT OF UTILITY MODEL

[0003] In view of the above defects of prior art, the utility model provides a kind of aluminum sulfate preparation system as follows:

[0004] The technical scheme of the utility model is as follows:

[0005] A kind of aluminum sulfate preparation system, including concentrated sulfuric acid storage tank, tap water storage tank, aluminium hydroxide batching tank and aluminum sulfate reaction kettle, the concentrated sulfuric acid storage tank is provided with sulfuric acid import and sulfuric acid export, the sulfuric acid export is connected with aluminum sulfate reaction kettle by concentrated sulfuric acid delivery pump, the tap water outlet of tap water storage tank is respectively connected with aluminium hydroxide batching tank and aluminum sulfate reaction kettle by tap water delivery pump, the front end of the aluminium hydroxide batching tank is provided with electronic scale for weighing solid aluminium hydroxide, the solid aluminium hydroxide is poured into aluminium hydroxide batching tank after weighing and mixed with tap water into a certain concentration of aluminium hydroxide slurry, the slurry outlet of the aluminium hydroxide batching tank is connected with aluminum sulfate reaction kettle by aluminium hydroxide delivery pump, the upper portion of the aluminum sulfate reaction kettle is connected with external tail gas absorption device, and the lower portion is connected with external aluminum sulfate crystallization device.

[0006] Preferably, the aluminum sulfate reaction kettle includes kettle body, and the kettle body is provided with aluminium hydroxide feeding port, concentrated sulfuric acid feeding port, water feeding port, tail gas discharge port, thermometer interface, safety vent, sight glass port, pressure detection port, compressed air interface and manhole, respectively, the concentrated sulfuric acid feeding port is connected with concentrated sulfuric acid storage tank, the water feeding port is connected with tap water storage tank, the tail gas discharge port is connected with external tail gas absorption device, the compressed air interface is connected with external compressed air device, the kettle body bottom is provided with discharge port, and the discharge port is connected with external aluminum sulfate crystallization device.

[0007] Preferably, a power motor is arranged at the middle of the top of the kettle body, and a stirring device is connected to the power output shaft of the power motor, the stirring device extends into the kettle body, and the stirring device comprises a stirring shaft and a stirring blade arranged at the bottom of the stirring shaft, and the outer scraping surface of the stirring blade is close to the kettle body without contacting the kettle body.

[0008] Preferably, the outer scraping surface of the stirring blade is in an arc shape.

[0009] Preferably, a gas guide pipe extending into the bottom of the kettle body is arranged at the tail gas discharge port.

[0010] Preferably, the inner surface of the kettle body is made of carbon steel coated with ceramic material.

[0011] Preferably, a vent port, a sewage discharge port and a standby port are arranged on the concentrated sulfuric acid storage tank.

[0012] Preferably, a power motor is arranged on the top of the aluminum hydroxide batching tank, and a stirring device is connected to the power output shaft of the power motor, the stirring device extends into the kettle body, and the stirring device comprises a stirring shaft and a stirring blade arranged at the bottom of the stirring shaft, and the outer scraping surface of the stirring blade is in a triangular shape.

[0013] Compared with the prior art, the aluminum sulfate preparation system has the following beneficial effects:

[0014] The aluminum sulfate preparation system of the utility model, through the aluminum hydroxide batching tank, the solid aluminum hydroxide is prepared into a certain concentration of aluminum hydroxide slurry, and then is put into the aluminum sulfate reaction kettle, the concentrated sulfuric acid is added into the reaction kettle in batches through the concentrated sulfuric acid delivery pump, the supply of raw materials is accurately controlled, the raw materials are fully reacted in the reaction kettle through the regular stirring of the stirrers in the aluminum hydroxide batching tank and the aluminum sulfate reaction kettle, the temperature and pressure in the reaction kettle are controlled, the product generation efficiency and product purity are improved, in addition, the kettle body is made of carbon steel coated with ceramic material, the corrosion of sulfuric acid is effectively reduced, and the maintenance cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic view of the field layout of the aluminum sulfate preparation system of the utility model;

[0016] Figure 2 It is a structural schematic view of the aluminum sulfate reaction kettle of the utility model;

[0017] Figure 3 It is a top view structural schematic view of the aluminum sulfate reaction kettle of the utility model;

[0018] Figure 4 It is a structural schematic view of the concentrated sulfuric acid storage tank of the utility model;

[0019] Figure 5The utility model discloses a concentrated hydrogen oxide aluminum batching tank's structure schematic view.

[0020] In the drawing: concentrated sulfuric acid storage tank 1, vent 1-1, pollution outlet 1-2, standby port 1-3, tap water storage tank 2, aluminum hydroxide batching tank 3, aluminum sulfate reaction kettle 4, kettle body 4-1, aluminum hydroxide feed port 4-2, concentrated sulfuric acid feed port 4-3, water feed port 4-4, tail gas discharge port 4-5, thermometer interface 4-6, safety vent 4-7, sight glass port 4-8, pressure detection port 4-9, compressed air interface 4-10, manhole 4-11, discharge port 4-12, concentrated sulfuric acid delivery pump 5, tap water delivery pump 6, electronic scale 7, aluminum hydroxide delivery pump 8, tail gas absorption device 9, aluminum sulfate crystallization device 10, power motor 11, stirrer 12, stirring shaft 12-1, stirring blade 12-2, air guide pipe 13. DETAILED DESCRIPTION

[0021] The utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model.

[0022] As Figure 1 An aluminum sulfate preparation system, comprising concentrated sulfuric acid storage tank 1, tap water storage tank 2, aluminum hydroxide batching tank 3 and aluminum sulfate reaction kettle 4, the concentrated sulfuric acid storage tank 1 is provided with sulfuric acid import and sulfuric acid export, the sulfuric acid export is connected with aluminum sulfate reaction kettle 4 through concentrated sulfuric acid delivery pump 5, the tap water export of tap water storage tank 2 is connected with aluminum hydroxide batching tank 3 and aluminum sulfate reaction kettle 4 respectively through tap water delivery pump 6, the front end of aluminum hydroxide batching tank 3 is provided with electronic scale 7 for weighing solid aluminum hydroxide, the electronic scale 7 is used for accurately inputting the amount of solid aluminum hydroxide in aluminum hydroxide batching tank 3, after weighing, the solid aluminum hydroxide is input into aluminum hydroxide batching tank 3 and tap water and is mixed and stirred into aluminum hydroxide slurry of certain concentration, the slurry export of aluminum hydroxide batching tank 3 is connected with aluminum sulfate reaction kettle 4 through aluminum hydroxide delivery pump 8, the upper portion of aluminum sulfate reaction kettle 4 is connected with external tail gas absorption device 9, because there is a small amount of metal aluminum in raw material, there is the possibility of hydrogen generation when reacting in kettle, and timely exhaust can avoid the risk of hydrogen explosion caused by high temperature in acid-base neutralization process, the lower portion is connected with external aluminum sulfate crystallization device 10, and the heavy metal and impurity content in aluminum sulfate is controlled to meet product requirements through recrystallization, ion exchange and other processes. Figure 2 、 3As shown, the aluminum sulfate reactor 4 includes a reactor body 4-1. The upper part of the reactor body 4-1 is provided with an aluminum hydroxide inlet 4-2, a concentrated sulfuric acid inlet 4-3, a water inlet 4-4, a tail gas outlet 4-5, a thermometer interface 4-6, a safety vent 4-7, a sight glass 4-8, a pressure detection port 4-9, a compressed air interface 4-10, and a manhole 4-11 (with a sight glass). The concentrated sulfuric acid inlet 4-3 is connected to a concentrated sulfuric acid storage tank 1 via a concentrated sulfuric acid transfer pump 5. The water inlet 4-4 is connected to a tap water storage tank 2 via a tap water transfer pump 6. The tail gas outlet 4-5 is connected to an external tail gas absorption device 9. The compressed air interface 4-10 is connected to an external compressed air device. The bottom of the reactor body 4-1 is provided with a discharge port 4-12, which is connected to an external aluminum sulfate crystallization device 10. Two sight glasses 4-8 are provided. A power motor 11 is located at the top center of the vessel body 4-1. The power output shaft of the power motor 11 is connected to a stirrer 12, which extends into the vessel body 4-1. The stirrer 12 includes a stirring shaft 12-1 and a stirring scraper 12-2 installed at the bottom of the stirring shaft 12-1. The outer scraping surface of the stirring scraper 12-2 is close to but does not contact the vessel body 4-1. The structure of the stirrer 12 can prevent the mixed slurry from sticking to the bottom of the vessel body 4-1, and the power motor 11 can rotate in both directions, driving the stirrer 12 to tumble and stir in both directions. The outer scraping surface of the stirring scraper 12-2 is arc-shaped, which better matches the inner side of the vessel bottom and avoids the existence of dead corners in the stirring.

[0023] A gas guide pipe 13 extending into the bottom of the reactor body is installed at the exhaust port 4-5. During the reaction, the mixed exhaust gas, carrying the heat of reaction, is forced into the exhaust gas absorption device 9 through the gas guide pipe 13. The inner surface of the reactor body 4-1 is made of carbon steel plated with ceramic material, which resists the strong corrosion of sulfuric acid and reduces maintenance costs. Figure 4 As shown, the concentrated sulfuric acid storage tank 1 is equipped with a vent 1-1, a drain 1-2, and a spare port 1-3. Figure 5 As shown, a power motor 11 is installed on the top of the aluminum hydroxide mixing tank 3. The power output shaft of the power motor 11 is connected to a stirrer 12. The stirrer 12 extends into the tank body. The stirrer 12 includes a stirring shaft and a stirring scraper installed at the bottom of the stirring shaft. The outer scraping surface of the stirring scraper is triangular in shape.

[0024] The aluminum sulfate preparation system of this invention has the following aluminum sulfate process flow:

[0025] 1. Aluminum hydroxide batching process:

[0026] 11) Weigh the required amount of solid aluminum hydroxide using an electronic floor scale 7 according to the formula requirements;

[0027] 12) start the tap water delivery pump 6, the tap water in the tap water storage tank 2 is used tap water delivery pump 6, after metering, into the aluminum hydroxide batching tank 3, and the weighed solid aluminum hydroxide is put into the aluminum hydroxide batching tank 3, start stirring, and prepare the solid aluminum hydroxide into a certain concentration of aluminum hydroxide slurry.

[0028] 2, aluminum sulfate reaction process:

[0029] 21) the prepared aluminum hydroxide slurry is delivered to the aluminum sulfate reaction kettle 4 by the aluminum hydroxide delivery pump 8 after metering.

[0030] 22) start the concentrated sulfuric acid delivery pump 5, and add the concentrated sulfuric acid in the concentrated sulfuric acid storage tank 1 to the aluminum sulfate reaction kettle 4 in batches by the concentrated sulfuric acid delivery pump 5 after metering, control the temperature and pressure in the aluminum sulfate reaction kettle 4, and keep the temperature and pressure for a period of time after the concentrated sulfuric acid is completely added, so that the aluminum sulfate reaction is completely carried out.

[0031] 23) the tail gas generated in the reaction process enters the tail gas absorption device 9, and the waste water generated after absorption is all used for the production process.

[0032] 24) sample analysis of the obtained aluminum sulfate product, according to the results of the analysis of the product PH value and the content of alumina, add appropriate water or concentrated sulfuric acid to the aluminum sulfate reaction kettle 4, adjust the PH value and the content of alumina of the product, so that the product quality meets the requirements.

[0033] 25) after the product quality is qualified, open the compressed air valve of the aluminum sulfate reaction kettle 4, pressurize the aluminum sulfate reaction kettle 4, control the pressure in the kettle, open the discharge valve at the bottom of the aluminum sulfate reaction kettle 4, and transfer the liquid aluminum sulfate in the kettle to the aluminum sulfate crystallization device 10, and finally obtain the finished solid aluminum sulfate product.

[0034] According to the structure and process flow of the utility model, the solid aluminum hydroxide is prepared into a certain concentration of aluminum hydroxide slurry by the aluminum hydroxide batching tank, then put into the aluminum sulfate reaction kettle, add the concentrated sulfuric acid to the reaction kettle in batches by the concentrated sulfuric acid delivery pump, accurately control the supply of raw materials, and the raw materials are fully reacted in the reaction kettle through the regular stirring of the stirrers in the aluminum hydroxide batching tank and the aluminum sulfate reaction kettle, the temperature and pressure in the reaction kettle are controlled, the generation efficiency and product purity are improved, in addition, the carbon steel is plated with ceramic material inside the kettle body, which effectively reduces the corrosion of sulfuric acid and reduces the maintenance cost.

Claims

1. An aluminum sulfate production system, characterized by, The application relates to a kind of aluminum sulfate production device, including concentrated sulfuric acid storage tank, tap water storage tank, aluminum hydroxide batching tank and aluminum sulfate reaction kettle, the concentrated sulfuric acid storage tank is provided with sulfuric acid import and sulfuric acid export, the sulfuric acid export is connected with aluminum sulfate reaction kettle by concentrated sulfuric acid delivery pump, the tap water outlet of tap water storage tank is connected with aluminum sulfate reaction kettle and aluminum hydroxide batching tank respectively by tap water delivery pump, the front end of aluminum hydroxide batching tank is provided with electronic scale for weighing solid aluminum hydroxide, the solid aluminum hydroxide is weighed and then put into aluminum hydroxide batching tank and tap water to mix into a certain concentration of aluminum hydroxide slurry, the slurry outlet of aluminum hydroxide batching tank is connected with aluminum sulfate reaction kettle by aluminum hydroxide delivery pump, the upper portion of aluminum sulfate reaction kettle is connected with external tail gas absorption device, and the lower portion is connected with external aluminum sulfate crystallization device.

2. The aluminum sulfate preparation system of claim 1, wherein, The aluminum sulfate reaction kettle includes kettle body, and the upper portion of the kettle body is respectively provided with aluminum hydroxide feeding port, concentrated sulfuric acid feeding port, water feeding port, tail gas discharge port, thermometer interface, safety venting port, sight glass port, pressure detection port, compressed air interface and manhole, the concentrated sulfuric acid feeding port is connected with concentrated sulfuric acid storage tank, the water feeding port is connected with tap water storage tank, the tail gas discharge port is connected with external tail gas absorption device, the compressed air interface is connected with external compressed air device, and the bottom of the kettle body is provided with discharge port, which is connected with external aluminum sulfate crystallization device.

3. The aluminum sulfate production system of claim 2, wherein, The top of the kettle body is provided with power motor at middle position, and the power output shaft of the power motor is connected with stirrer, the stirrer extends into the kettle body, and the stirrer includes stirring shaft and stirring blade installed at the bottom of the stirring shaft, and the outer scraping surface of the stirring blade is close to the kettle body without contact.

4. The aluminum sulfate preparation system of claim 3, wherein The outer scraping surface of the stirring blade is in arc shape.

5. The aluminum sulfate preparation system of claim 2, wherein, The tail gas discharge port is provided with gas guide pipe extending into the bottom of the kettle body.

6. The aluminum sulfate preparation system of claim 2, wherein, The inner surface of the kettle body is carbon steel coated with ceramic material.

7. The aluminum sulfate production system of claim 1, wherein, The concentrated sulfuric acid storage tank is provided with venting port, blowdown port and standby port.

8. The aluminum sulfate production system of claim 1, wherein, The top of the aluminum hydroxide batching tank is provided with power motor, the power output shaft of the power motor is connected with stirrer, the stirrer extends into the kettle body, the stirrer includes stirring shaft and stirring blade installed at the bottom of the stirring shaft, and the outer scraping surface of the stirring blade is in triangular shape.

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