CN215592615U - Semi-water-dihydrate wet-process phosphoric acid semi-water reaction fluorine absorption device - Google Patents
Semi-water-dihydrate wet-process phosphoric acid semi-water reaction fluorine absorption device Download PDFInfo
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- CN215592615U CN215592615U CN202120697920.9U CN202120697920U CN215592615U CN 215592615 U CN215592615 U CN 215592615U CN 202120697920 U CN202120697920 U CN 202120697920U CN 215592615 U CN215592615 U CN 215592615U
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Abstract
The utility model discloses a semi-water-dihydrate wet-process phosphoric acid semi-water reaction fluorine absorption device, which comprises a semi-water reaction fluorine absorption system, a semi-water reaction tail washing system and a silica gel filtration system, wherein the silica gel filtration system comprises a rotary drum filter, a washing liquid tank and a silica gel collecting tank; a third path of a liquid outlet of the first fluorine absorption circulating pump is connected with a liquid inlet of the rotary drum filter, one path of a liquid outlet of a washing liquid tank of the rotary drum filter is connected with the first fluorine absorption circulating tank through a washing liquid pump, and the other path of the liquid outlet of the washing liquid tank of the rotary drum filter is connected with a liquid inlet of the first tail gas washing tower; one path of a liquid outlet of the first tail gas washing circulating pump is connected with the rotary drum filter, and the other path of the liquid outlet of the first tail gas washing circulating pump is connected with a second liquid return port of the first tail gas washing tower. The method solves the problems that the concentration of fluosilicic acid obtained in the tail washing process and the fluorine absorption process of fluorine in the reaction fluorine absorption process is low due to distribution deviation, and solves the problems that a spray head is easy to block, the fluorine absorption efficiency is low, the fluorine stays in a system for a long time and the like due to silica gel precipitation.
Description
Technical Field
The utility model belongs to the technical field of wet-process phosphoric acid treatment, and particularly relates to a semi-water-dihydrate wet-process phosphoric acid semi-water reaction fluorine absorption device.
Background
The semi-water-dihydrate wet-process phosphoric acid device generally adopts enriched phosphorite as a raw material, the fluorine content is about 3 percent generally, in the reaction process, the fluorine in the phosphorite overflows in the form of gas (SiF4 and HF), the overflow amount of the fluorine is about 5 to 10 percent relative to the reaction system of the dihydrate wet-process phosphoric acid process, the overflow amount of the fluorine in the semi-water reaction process of the semi-water-dihydrate wet-process phosphoric acid process reaches 30 to 40 percent, and the fluorine mainly overflows in the form of semi-water reaction flash cold gas and semi-water reaction tail gas. The production characteristics of the semi-water-dihydrate wet-process phosphoric acid process are caused, silica gel is concentrated in the first fluorine absorption circulating tank and the first tail gas washing tower, and if the silica gel cannot be transferred out in time, the blockage of pipelines and spray heads in the fluorine absorption and tail gas washing processes can be caused, the start rate is low, and the cleaning difficulty is high; by adopting the method, the accumulation of silica gel in the fluorine absorption system can be effectively reduced, thereby reducing the frequent blockage of fluorine absorption process pipelines and spray heads.
Disclosure of Invention
The utility model aims to solve the problems in the prior art, provides a semi-water-dihydrate wet-process phosphoric acid semi-water reaction fluorine absorption device, and solves the problems that semi-water-dihydrate wet-process phosphoric acid process semi-water reaction fluorine absorption pipelines and nozzles are easy to block, the cleaning period is short, the driving rate is low and the like.
In order to achieve the purpose, the semi-water-dihydrate wet-process phosphoric acid semi-water reaction fluorine absorption device comprises a semi-water reaction fluorine absorption system and a semi-water reaction tail washing system, wherein the semi-water reaction fluorine absorption system comprises a first fluorine absorption tower, a first fluorine absorption circulating tank, a first fluorine absorption circulating pump, a second fluorine absorption tower, a second fluorine absorption circulating tank and a second fluorine absorption circulating pump; the device also comprises a silica gel filtering system, wherein the silica gel filtering system comprises a rotary drum filter, a washing liquid tank and a silica gel collecting tank; the third path of the liquid outlet of the first fluorine absorption circulating pump is connected with the liquid inlet of the rotary drum filter, the liquid outlet of the rotary drum filter is connected with the liquid inlet of a washing liquid tank, one path of the liquid outlet of the washing liquid tank is connected with the first fluorine absorption circulating tank through a washing liquid pump, the other path of the liquid outlet of the washing liquid tank is connected with the liquid inlet of a first tail gas washing tower, and the silica gel outlet of the rotary drum filter is connected with a silica gel collecting tank;
semi-water reaction tail gas is connected into an air inlet of a Venturi scrubber, a liquid outlet of the Venturi scrubber is connected with a liquid inlet of a first tail gas washing tower, a liquid outlet of the first tail gas washing tower is connected with a liquid inlet of a first tail gas washing circulating pump, one path of the liquid outlet of the first tail gas washing circulating pump is connected with a rotary drum filter, and the other path of the liquid outlet of the first tail gas washing circulating pump is connected with a second liquid return port of the first tail gas washing tower.
Furthermore, a first path of a liquid outlet of the first fluorine absorption circulating pump is connected with an air inlet pipe of semi-water flash cold air in front of the first fluorine absorption tower, and a second path of the liquid outlet is connected with a liquid return port of the first fluorine absorption tower.
Further, the gas outlet of the first fluorine absorption tower is connected with the gas inlet of the second fluorine absorption tower, the liquid outlet of the second fluorine absorption tower is connected with the liquid inlet of the second fluorine absorption circulating tank, the liquid outlet of the second fluorine absorption circulating tank is connected with the liquid return port of the second fluorine absorption tower through the second fluorine absorption circulating pump, the gas outlet of the second fluorine absorption tower is connected with the condenser through the first gas-liquid separator, and the condenser is connected with the chimney through the semi-water flash cold vacuum pump.
Further, the gas outlet of the first tail gas washing tower is connected with the liquid inlet of the second tail gas washing tower, the gas outlet of the second tail gas washing tower is connected with the second gas-liquid separator, and the second gas-liquid separator is connected with the chimney through the semi-water reaction tail gas fan.
Furthermore, a liquid outlet of the second tail gas washing tower is connected with a liquid inlet of a first pump of the second tail gas washing cycle, one path of the liquid outlet of the first pump of the second tail gas washing cycle is connected with a first liquid return port of the first tail gas washing tower, the other path of the liquid outlet is connected with a first liquid return port of the second tail gas washing tower, and a second liquid outlet of the second tail gas washing tower is connected with a second liquid return port of the second tail gas washing tower through a second pump of the second tail gas washing cycle.
Further, a spraying device is arranged before the second path of the liquid outlet of the first fluorine absorption circulating pump enters the first fluorine absorption tower, a spraying device is arranged in the air inlet pipe, a spraying device is arranged before the liquid outlet of the second fluorine absorption circulating pump enters the second fluorine absorption tower, a spraying device is arranged before the other path of the liquid outlet of the first tail gas washing circulating pump enters the first tail gas washing tower, a spraying device is arranged before the liquid outlet of the first tail gas washing circulating pump enters the first liquid return port of the second tail gas washing tower, and a spraying device is arranged before the liquid outlet of the second tail gas washing circulating pump enters the second liquid return port of the second tail gas washing tower.
Compared with the prior art, the utility model has the following advantages: the semi-water-dihydrate wet-process phosphoric acid semi-water reaction fluorine absorption device solves the problems that the concentration of fluosilicic acid obtained in a reaction fluorine absorption procedure in a tail washing procedure and a fluorine absorption procedure is low due to distribution deviation, solves the problems that a nozzle is easy to block, the fluorine absorption efficiency is low, the fluorine stays in a system for a long time and the like due to silica gel precipitation, effectively reduces the contents of silica gel and fluosilicate in a fluosilicic acid solution, and improves the fluorine absorption efficiency.
Drawings
FIG. 1 is a schematic flow diagram of a semi-water-dihydrate wet-process phosphoric acid semi-water reaction fluorine absorption device of the present invention.
Detailed Description
The utility model is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1, the semi-water-dihydrate wet-process phosphoric acid semi-water reaction fluorine absorption device comprises a semi-water reaction fluorine absorption system, a semi-water reaction tail washing system and a silica gel filtration system, wherein the semi-water reaction fluorine absorption system comprises a first fluorine absorption tower 1, a first fluorine absorption circulation tank 8, a first fluorine absorption circulation pump 7, a second fluorine absorption tower 2, a second fluorine absorption circulation tank 9, a second fluorine absorption circulation pump 10 and a first gas-liquid separator 3, condenser 4 and semiwater flash cold vacuum pump 5, semiwater reaction tail-gas washing system include venturi scrubber 15, first tail gas washing tower 17, first tail gas washing pump 16, second tail gas washing tower 18, No. 22 of second tail-gas washing circulation, No. 19 of second tail-gas washing circulation, second vapour and liquid separator 20 and semiwater reaction tail gas fan 21, and silica gel filtration system includes rotary drum filter 11, washing liquid tank 12 and silica gel collecting vat 13.
The semi-water flash cold air is connected with an air inlet of a first fluorine absorption tower 1 through an air inlet pipe, a liquid outlet of the first fluorine absorption tower 1 is connected with a liquid inlet of a first fluorine absorption circulating tank 8, a liquid outlet of the first fluorine absorption circulating tank 8 is connected with a liquid inlet of a first fluorine absorption circulating pump 7, a first path of the liquid outlet of the first fluorine absorption circulating pump 7 is connected with the air inlet pipe of the semi-water flash cold air in front of the first fluorine absorption tower 1, a second path of the liquid outlet is connected with a liquid return port of the first fluorine absorption tower 1, a third path of the liquid outlet is connected with a liquid inlet of a rotary drum filter 11, a liquid outlet of the rotary drum filter 11 is connected with a liquid inlet of a washing liquid tank 12, one path of the liquid outlet of the washing liquid tank 12 is connected with the first fluorine absorption circulating tank 8 through a washing liquid pump 14, the other path is connected with a liquid inlet of a first tail gas washing tower 17, and a silica gel outlet of the rotary drum filter 11 is connected with a silica gel collecting tank 13; the gas outlet of first fluorine absorption tower 1 links to each other with the air inlet of second fluorine absorption tower 2, and the liquid outlet of second fluorine absorption tower 2 links to each other with the inlet of second fluorine absorption circulation groove 9, and the liquid outlet of second fluorine absorption circulation groove 9 links to each other through the liquid mouth that returns of second fluorine absorption circulating pump 10 with second fluorine absorption tower 2, and the gas outlet of second fluorine absorption tower 2 passes through first vapour and liquid separator 3 and links to each other with condenser 4, and condenser 4 links to each other with chimney 6 through half water flash of water cold vacuum pump 5.
Semi-water reaction tail gas is connected into an air inlet of a Venturi scrubber 15, a liquid outlet of the Venturi scrubber 15 is connected with a liquid inlet of a first tail gas washing tower 17, an air outlet of the first tail gas washing tower 17 is connected with a liquid inlet of a second tail gas washing tower 18, an air outlet of the second tail gas washing tower 18 is connected with a second gas-liquid separator 20, and the second gas-liquid separator 20 is connected with a chimney 6 through a semi-water reaction tail gas fan 21; a first liquid outlet of the second tail gas washing tower 18 is connected with a liquid inlet of a second tail gas washing circulation first pump 22, one path of a liquid outlet of the second tail gas washing circulation first pump 22 is connected with a first liquid return port of the first tail gas washing tower 17, the other path of the liquid outlet is connected with a first liquid return port of the second tail gas washing tower 18, and a second liquid outlet of the second tail gas washing tower 18 is connected with a second liquid return port of the second tail gas washing tower 18 through a second tail gas washing circulation second pump 19; the liquid outlet of the first tail gas washing tower 17 is connected with the liquid inlet of a first tail gas washing circulating pump 16, one path of the liquid outlet of the first tail gas washing circulating pump 16 is connected with the rotary drum filter 11, and the other path of the liquid outlet is connected with a second liquid return port of the first tail gas washing tower 17.
And, be provided with spray set in the intake pipe, be provided with spray set before 8 liquid outlets of first fluorine absorption circulating pump second way get into first fluorine absorption tower 1, be provided with spray set before 10 liquid outlets of second fluorine absorption circulating pump get into second fluorine absorption tower 2, be provided with spray set before the another way of liquid outlet of first tail gas washing circulating pump 16 gets into first tail gas washing tower 17, the liquid outlet of No. one pump 22 of second tail gas washing circulation is provided with spray set before getting into 18 first liquid return mouths of second tail gas washing tower, the liquid outlet of No. two pumps 19 of second tail gas washing circulation is provided with spray set before getting into 18 second liquid return mouths of second tail gas washing tower.
Semi-water flash cold air passes through a first fluorine absorption tower, and washing liquid is respectively conveyed to the first fluorine absorption tower through a first fluorine absorption circulating pump and then is sprayed and washed in an air inlet pipe and washed in the first fluorine absorption tower; semi-water flash cold air enters a second fluorine absorption tower after passing through a first fluorine absorption tower, and washing liquid is circularly washed in the second fluorine absorption circulating pump tower; after the semi-water flash cold air passes through the second fluorine absorption tower, the semi-water flash cold air passes through a gas-liquid separator to separate a liquid phase, and then is washed by a circulating water cooler to meet the discharge requirement. Washing liquid in the first fluorine absorption circulation tank also enters the rotary drum filter through the first fluorine absorption circulation pump, the filtered washing liquid returns to the first fluorine absorption circulation pump through the washing liquid pump all the way, is sent to the first tail gas washing tower all the way, and silica gel in the rotary drum filter is sent to the silica gel collecting tank and is collected.
And after being washed by a Venturi scrubber, the semi-water reaction tail gas enters a first tail gas washing tower, circularly washed in the first tail gas washing tower by a first tail gas washing circulating pump, enters a second tail gas washing tower, circularly washed in the second tail gas washing tower by a second tail gas washing circulating pump, and sent to a chimney for discharge by a gas second liquid separator and a semi-water tail gas fan. And the washing liquid in the first tail gas washing tower is conveyed to the rotary drum filter for filtering circulation through the first tail gas washing circulating pump, and returns to the first tail gas washing tower through the first tail gas washing circulating pump.
In this embodiment, the rotary drum filter is a folding belt type vacuum rotary drum filter.
The semi-water-dihydrate wet-process phosphoric acid semi-water reaction fluorine absorption device solves the problem that the concentration of fluosilicic acid obtained in a reaction fluorine absorption procedure in a tail washing procedure and a fluorine absorption procedure is low due to distribution deviation, solves the problems that pipelines and nozzles are easy to block, the fluorine absorption efficiency is low, fluorine stays in a system for a long time and the like due to silica gel precipitation, effectively reduces the content of silica gel and fluosilicate in fluosilicic acid, and improves the fluorine absorption efficiency.
Claims (6)
1. A semi-water-dihydrate wet-process phosphoric acid semi-water reaction fluorine absorption device comprises a semi-water reaction fluorine absorption system and a semi-water reaction tail washing system, wherein the semi-water reaction fluorine absorption system comprises a first fluorine absorption tower (1), a first fluorine absorption circulating tank (8), a first fluorine absorption circulating pump (7), a second fluorine absorption tower (2), a second fluorine absorption circulating tank (9) and a second fluorine absorption circulating pump (10), and the semi-water reaction tail washing system comprises a Venturi scrubber (15), a first tail gas washing tower (17), a first tail gas washing pump (16) and a second tail gas washing tower (18); the method is characterized in that: the device also comprises a silica gel filtering system, wherein the silica gel filtering system comprises a rotary drum filter (11), a washing liquid tank (12) and a silica gel collecting tank (13); a third path of a liquid outlet of the first fluorine absorption circulating pump (7) is connected with a liquid inlet of the rotary drum filter (11), a liquid outlet of the rotary drum filter (11) is connected with a liquid inlet of a washing liquid tank (12), one path of the liquid outlet of the washing liquid tank (12) is connected with the first fluorine absorption circulating tank (8) through a washing liquid pump (14), the other path of the liquid outlet is connected with a liquid inlet of a first tail gas washing tower (17), and a silica gel outlet of the rotary drum filter (11) is connected with a silica gel collecting tank (13);
semi-water reaction tail gas is connected into an air inlet of a Venturi scrubber (15), a liquid outlet of the Venturi scrubber (15) is connected with a liquid inlet of a first tail gas washing tower (17), a liquid outlet of the first tail gas washing tower (17) is connected with a liquid inlet of a first tail gas washing circulating pump (16), one path of a liquid outlet of the first tail gas washing circulating pump (16) is connected with a rotary drum filter (11), and the other path of the liquid outlet is connected with a second liquid return port of the first tail gas washing tower (17).
2. The apparatus for absorbing fluorine from hemihydrate-dihydrate wet process phosphoric acid hemihydrate of claim 1, wherein: the first path of a liquid outlet of the first fluorine absorption circulating pump (7) is connected with an air inlet pipe of semi-water flash cold air in front of the first fluorine absorption tower (1), and the second path of the liquid outlet is connected with a liquid return port of the first fluorine absorption tower (1).
3. The apparatus for absorbing fluorine from hemihydrate-dihydrate wet process phosphoric acid hemihydrate of claim 1, wherein: the gas outlet of first fluorine absorption tower (1) links to each other with the air inlet of second fluorine absorption tower (2), the liquid outlet of second fluorine absorption tower (2) links to each other with the inlet of second fluorine absorption circulation groove (9), the liquid outlet of second fluorine absorption circulation groove (9) links to each other through the liquid mouth that returns of second fluorine absorption circulation pump (10) and second fluorine absorption tower (2), the gas outlet of second fluorine absorption tower (2) links to each other with condenser (4) through first vapour and liquid separator (3), condenser (4) are through partly water to flash cold vacuum pump (5) and chimney (6) and link to each other.
4. The apparatus for absorbing fluorine from hemihydrate-dihydrate wet process phosphoric acid hemihydrate of claim 1, wherein: the gas outlet of the first tail gas washing tower (17) is connected with the liquid inlet of the second tail gas washing tower (18), the gas outlet of the second tail gas washing tower (18) is connected with the second gas-liquid separator (20), and the second gas-liquid separator (20) is connected with the chimney (6) through a semi-water reaction tail gas fan (21).
5. The apparatus for absorbing fluorine from hemihydrate-dihydrate wet process phosphoric acid hemihydrate of claim 1, wherein: a liquid outlet of the second tail gas washing tower (18) is connected with a liquid inlet of a first pump (22) of a second tail gas washing cycle, one path of a liquid outlet of the first pump (22) of the second tail gas washing cycle is connected with a first liquid return port of the first tail gas washing tower (17), the other path of the liquid outlet is connected with a first liquid return port of the second tail gas washing tower (18), and a second liquid outlet of the second tail gas washing tower (18) is connected with a second liquid return port of the second tail gas washing tower (18) through a second pump (19) of the second tail gas washing cycle.
6. The apparatus for absorbing fluorine from hemihydrate-dihydrate wet process phosphoric acid hemihydrate of claim 1, wherein: a spraying device is arranged before a second path of a liquid outlet of the first fluorine absorption circulating pump (8) enters the first fluorine absorption tower (1), a spraying device is arranged in an air inlet pipe, a spraying device is arranged before a liquid outlet of the second fluorine absorption circulating pump (10) enters the second fluorine absorption tower (2), a spraying device is arranged before another path of a liquid outlet of the first tail gas washing circulating pump (16) enters the first tail gas washing tower (17), a spraying device is arranged before a liquid outlet of the first tail gas washing circulating pump (22) enters the first liquid return port of the second tail gas washing tower (18), and a spraying device is arranged before a liquid outlet of the second tail gas washing circulating pump (19) enters the second tail gas washing tower (18) and the second liquid return port.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120697920.9U CN215592615U (en) | 2021-04-06 | 2021-04-06 | Semi-water-dihydrate wet-process phosphoric acid semi-water reaction fluorine absorption device |
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| CN202120697920.9U CN215592615U (en) | 2021-04-06 | 2021-04-06 | Semi-water-dihydrate wet-process phosphoric acid semi-water reaction fluorine absorption device |
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| CN202120697920.9U Active CN215592615U (en) | 2021-04-06 | 2021-04-06 | Semi-water-dihydrate wet-process phosphoric acid semi-water reaction fluorine absorption device |
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- 2021-04-06 CN CN202120697920.9U patent/CN215592615U/en active Active
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