CN211799880U - Fluorine resource recovery unit in phosphoric acid production tail gas of wet process - Google Patents
Fluorine resource recovery unit in phosphoric acid production tail gas of wet process Download PDFInfo
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- CN211799880U CN211799880U CN202020017179.2U CN202020017179U CN211799880U CN 211799880 U CN211799880 U CN 211799880U CN 202020017179 U CN202020017179 U CN 202020017179U CN 211799880 U CN211799880 U CN 211799880U
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Abstract
The utility model discloses a device for recovering fluorine resources in tail gas in wet-process phosphoric acid production, which adds a flowmeter and a pressure gauge at the outlet of a venturi scrubber and a washing tower circulating pump, ensures the circulating amount and the nozzle back pressure of the venturi scrubber and the washing tower, and ensures that fluorine-containing gas and circulating liquid are fully mixed and absorbed by air flow; the mode of circulating washing is countercurrent washing; continuously discharging low-concentration fluosilicic acid from the outlet of a circulating pump of the Venturi scrubber, allowing the low-concentration fluosilicic acid to enter a phosphoric acid filtering and separating system to be used as filter cake washing water, dissolving the low-concentration fluosilicic acid into a dilute phosphoric acid product, and separating in a phosphoric acid concentration process to produce a high-concentration fluosilicic acid product, thereby fully recovering fluorine resources. The utility model discloses can furthest retrieve the fluorine resource in the phosphorite, reduce and cause environmental pollution in the gaseous atmosphere that gets into of fluorine-containing. The utility model discloses the device is simple, and reproducibility is strong. The bottleneck problem that the recovery of fluorine resources in phosphoric acid tail washing is contradictory to the standard emission of tail gas is solved.
Description
Technical Field
The utility model relates to a fluorine resource recycle technical field in the phosphoric acid production of wet process, concretely relates to phosphoric acid production fluorine resource recovery of wet process, utilization, product conversion, the tail gas washing device of discharge to reach standard of low concentration fluorine silicon pickle.
Background
With the increasing importance of the country on environmental protection and the continuous atrophy of fluorine resources, the recycling of fluorine resources in wet-process phosphoric acid production will be a trend. In the washing procedure of tail gas in wet-process phosphoric acid production, silicon tetrafluoride gas escaping from the washing reaction is mainly washed by water to generate low-concentration fluosilicic acid. Most of the existing enterprises consider the fluosilicic acid as a byproduct, and the attention on the economic value of fluorine resources and the caused environmental problems is not enough.
An effective scheme for recovering fluorine resources in tail gas generated in wet-process phosphoric acid production is not available in a Chinese patent database at present. In the research and practice process of a wet-process phosphoric acid device, the inventor researches a device capable of recycling associated fluorine resources in phosphorite to the maximum extent and can create higher economic value; the method is favorable for reducing the entrance of fluorine-containing gas into the atmosphere in the wet-process phosphoric acid production, and effectively reducing the pollution of fluorine to the atmosphere; is beneficial to improving the working environment of staff and reducing the harm of fluorine to human body.
Disclosure of Invention
The utility model aims at providing a fluorine resource recovery unit in phosphoric acid by wet process production tail gas can furthest retrieve the fluorine resource in the phosphorite, reduces to cause environmental pollution in the gaseous atmosphere that gets into of fluorine-containing.
The inventor actually inspects a production field, combines the requirements of a device, and invents a device for recovering fluorine resources in tail gas generated in wet-process phosphoric acid production, wherein the device is modified on the basis of a traditional tail gas washing device as follows:
(1) a venturi circulating pump outlet flowmeter and a venturi circulating pump outlet pressure gauge are added at the outlet of the venturi circulating pump, and a washing tower circulating pump flowmeter and a washing tower circulating pump outlet pressure gauge are added at the outlet of the washing tower circulating pump;
(2) the washing tower is connected with a fresh washing water pipeline inlet and is provided with a fresh washing water pipeline outlet, and the fresh washing water pipeline outlet is connected to a Venturi scrubber sealing groove;
(3) and an outlet pipeline of the Venturi scrubber circulating pump is connected to a phosphoric acid filtering and separating system.
In the 1 st step of above-mentioned improvement, venturi scrubber and scrubbing tower are carbon steel material lining rubber, and the non-metallic pump is chooseed for use to the circulating pump, and the material of taking anticorrosive inside lining is chooseed for use to flowmeter and manometer.
The utility model discloses require more than 150m to venturi scrubber circulation volume3H, the requirement of the circulation amount of the washing tower of the washer is more than 200m3The pressure of the spray head is required to be more than 0.5 MPa.
Continuously discharging low-concentration fluosilicic acid from the outlet of a circulating pump of the Venturi scrubber and completely recycling the low-concentration fluosilicic acid into a phosphoric acid filtering and separating system to ensure that the recycled fluorine resources completely enter the filtered dilute phosphoric acid; the continuous operation of the tail gas washing system is realized, and the subsequent tail gas is ensured to be discharged up to the standard.
The principle and the using method of the utility model are as follows: in order to ensure the washing efficiency, a flowmeter and a pressure gauge are added at the outlet of a venturi scrubber and a washing tower circulating pump, so that the circulating amount and the nozzle back pressure of the venturi scrubber and the washing tower are ensured, and the fluorine-containing gas and the circulating liquid are fully mixed and absorbed by airflow; the circulating washing mode of the utility model is countercurrent washing, namely, the fresh washing liquid of the tail gas firstly enters the washing tower for circulating washing and then enters the Venturi scrubber to form step concentration which is favorable for absorption; discharging low-concentration fluosilicic acid from an outlet of a circulating pump of the Venturi scrubber to enter a phosphoric acid filtering and separating system; discharging the low-concentration fluosilicic acid obtained after the circular washing to a phosphoric acid filtering and separating system to be used as filter cake washing water, dissolving the low-concentration fluosilicic acid into a dilute phosphoric acid product, and separating in a phosphoric acid concentration process to produce a high-concentration fluosilicic acid product, thereby fully recovering fluorine resources.
Compared with the traditional device, the production device solves the problem of blockage of a phosphoric acid tail washing system in the operation process, and solves the problems that the low concentration of the produced product cannot meet the utilization requirement of downstream products and the high separation difficulty of silica gel content is difficult.
The production device has the beneficial effects that: the bottleneck problem that the recovery of fluorine resources in phosphoric acid tail washing is contradictory to the standard-reaching emission of tail gas is solved, the effective recovery and utilization of the fluorine resources in wet-process phosphoric acid production are realized, the continuous standard-reaching emission of a tail gas washing system in wet-process phosphoric acid production is realized, and the environmental pollution caused by the fluorine-containing gas entering the atmosphere is effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a process flow diagram of a device for recovering fluorine resources in tail gas from wet-process phosphoric acid production;
in the figure: 1-a venturi scrubber; 2-sealing groove of venturi scrubber; 3-a washing tower circulating pump; 4-tail washing fan; 5, discharging through a chimney; 6-circulation pump flowmeter of washing tower; 7-outlet pressure gauge of circulating pump of washing tower; 8. A washing tower spray head; 9-a washing tower; 10-a venturi nozzle; 11-a venturi circulation pump; 12-venturi circulation pump outlet flow meter; 13-extracting the tail gas; 14-venturi circulation pump outlet pressure gauge; 15-a filter; 16-concentration; 17-fluorine recovery; 18-filtering the dilute acid; 19-concentrated phosphoric acid pump; 20-fluorosilicic acid pump; 21-concentrated phosphoric acid; 22-fluosilicic acid; 23-fresh wash water.
Detailed Description
Example (b):
the following will further explain the process of the device for recovering fluorine resources in tail gas from wet-process phosphoric acid production with reference to the accompanying drawings.
A certain factory adopts the fluorine resource recovery device to produce and recover fluorine resources, and the specific scheme is as follows:
(1) a venturi circulating pump outlet flowmeter 12 and a venturi circulating pump outlet pressure gauge 14 are added at the outlet of the venturi circulating pump 11, and a washing tower circulating pump flowmeter 6 and a washing tower circulating pump outlet pressure gauge 7 are added at the outlet of the washing tower circulating pump 3;
(2) the inlet of a fresh washing water pipeline is connected to the washing tower 9, and the outlet of the fresh washing water pipeline is arranged, and the outlet of the fresh washing water pipeline is connected to the sealing groove 2 of the Venturi scrubber;
(3) and an outlet pipeline of the Venturi scrubber circulating pump is connected to a phosphoric acid filtering and separating system.
The circulation volume and the nozzle back pressure of the Venturi scrubber 1 and the washing tower are ensured in the operation process, and the requirement for the circulation volume of the Venturi scrubber is more than 150m3H, the requirement of the circulation amount of the washing tower of the washer is more than 200m3The pressure of the spray head is required to be more than 0.5 MPa.
The fluorine-containing gas and the circulating liquid are fully mixed and absorbed by airflow, and the system is cleaned and maintained regularly to ensure the washing rate;
fresh washing liquid enters from the washing tower, and continuous production is carried out by adopting a countercurrent washing circulating washing mode, so that the washing liquid is prevented from mixing;
continuously discharging low-concentration fluosilicic acid from the outlet of a circulating pump of the Venturi scrubber and completely recycling the low-concentration fluosilicic acid into a phosphoric acid filtering and separating system to ensure that the recycled fluorine resources completely enter the filtered dilute phosphoric acid;
discharging the low-concentration fluosilicic acid obtained after the circular washing to a phosphoric acid filtering and separating system to be used as filter cake washing water, dissolving the low-concentration fluosilicic acid into a dilute phosphoric acid product, and separating in a phosphoric acid concentration process to produce a high-concentration fluosilicic acid product, thereby fully recovering fluorine resources.
The device for recovering fluorine resources in wet-process phosphoric acid production tail gas provided by the embodiment of the present invention is described in detail above, and the description of the above embodiment is only used to help understanding the device and its core idea; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (2)
1. A device for recovering fluorine resources in tail gas generated in wet-process phosphoric acid production is characterized in that the device is modified on the basis of a traditional tail gas washing device as follows:
a venturi circulating pump outlet flow meter (12) and a venturi circulating pump outlet pressure gauge (14) are added at the outlet of the venturi circulating pump (11), and a washing tower circulating pump flow meter (6) and a washing tower circulating pump outlet pressure gauge (7) are added at the outlet of the washing tower circulating pump (3);
the washing tower (9) is connected with a fresh washing water pipeline inlet and is provided with a fresh washing water pipeline outlet, and the fresh washing water pipeline outlet is connected to the Venturi scrubber sealing groove (2);
and an outlet pipeline of the Venturi scrubber circulating pump is connected to a phosphoric acid filtering and separating system.
2. The device for recovering the fluorine resources in the tail gas generated in the production of the wet-process phosphoric acid according to claim 1, wherein the Venturi scrubber and the washing tower are lined with rubber made of carbon steel, the circulating pump is a non-metal pump, and the flow meter and the pressure gauge are provided with anti-corrosion linings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020017179.2U CN211799880U (en) | 2020-01-06 | 2020-01-06 | Fluorine resource recovery unit in phosphoric acid production tail gas of wet process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020017179.2U CN211799880U (en) | 2020-01-06 | 2020-01-06 | Fluorine resource recovery unit in phosphoric acid production tail gas of wet process |
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| CN211799880U true CN211799880U (en) | 2020-10-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116281904A (en) * | 2023-01-17 | 2023-06-23 | 昆明川金诺化工股份有限公司 | Method for reducing content of byproduct phosphorus fluosilicate in semi-water wet method phosphoric acid production |
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2020
- 2020-01-06 CN CN202020017179.2U patent/CN211799880U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116281904A (en) * | 2023-01-17 | 2023-06-23 | 昆明川金诺化工股份有限公司 | Method for reducing content of byproduct phosphorus fluosilicate in semi-water wet method phosphoric acid production |
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