CN219308162U - Smelting dilute acid deep purification filter equipment - Google Patents

Abstract

The utility model discloses a smelting dilute acid deep purification and filtration device, which comprises a buffer tank, a primary filter, a primary filtrate tank, a secondary filter, a secondary filtrate tank, a tertiary filter, a bottom launder, a filter press and a sewage tank; the buffer tank, the first-stage filter, the first-stage filtrate tank, the second-stage filter, the second-stage filtrate tank and the third-stage filter are communicated through pipelines in sequence; the primary filter slag discharge port is communicated with the underflow groove through a pipeline; the underflow groove is communicated with the filter press through a pipeline. The sewage outlet at the bottom of the secondary filter and the tertiary filter is communicated with the sewage tank through a pipeline; the blowdown tank is communicated with the buffer tank through a pipeline. The utility model can realize deep purification and filtration of smelting dilute acid, clarify filtrate, maintain the solid content below 1mg/L, effectively avoid the rhenium adsorption resin from being impregnated and wrapped by acid mud, prolong the service life of the resin, improve the recovery rate of rhenium, reduce the blockage of a system, increase the yield of valuable filter residues and reduce the subsequent treatment cost.

Description

Smelting dilute acid deep purification filter equipment

Technical Field

The utility model belongs to the technical field of smelting chemical industry, and particularly relates to a smelting dilute acid deep purification and filtration device.

Background

In the process of dilute acid purification and washing of the acid making device purification process, a large amount of mineral dust in the flue gas enters the circulating acid, the circulating acid is repeatedly used, the solid content is gradually increased, pipelines, spray heads, fillers, plate replacement and the like can be blocked in severe cases, the purification efficiency is reduced, the system resistance is increased, dust and mud in the dilute acid are required to be moved out of the system through an open circuit, solid impurities in a solution are generally removed through solid-liquid separation and filtration of the dilute acid produced in the purification process, and the dilute acid is sent to a rhenium recovery process to adsorb rare noble metal rhenium in the dilute acid through ion exchange resin and then sent to a contaminated acid vulcanization process to remove heavy metals.

At present, the dilute acid filtering equipment in the purification process consists of 1 inclined plate sedimentation tank and 2 inclined plate sedimentation tanks of 150m ² Horizontal filter press (one by one) with dilute acid treatment capacity of 200 m ³ And/h, the solid content of the treated dilute acid medium is 3.5g/L. Because the acid washing purification adopts closed circulation, the dilute acid has high treatment capacity and finer granularity, when the traditional sedimentation tank is adopted for solid-liquid separation, the sedimentation area is small, the detention time of the dilute acid in the tank is short, the dilute acid is not easy to thoroughly sediment, the expected sedimentation effect cannot be achieved, most of solid particles flow out along with the supernatant before sedimentation, the solid content of the supernatant is up to 400 mg/L, the rhenium adsorption resin is soaked and wrapped by acid mud due to poor filtering effect of the dilute acid, the rhenium recovery rate is reduced, the waste acid vulcanization operation load and the treatment cost are increased, and the acid mud cannot be effectively recovered.

Disclosure of Invention

The utility model aims to provide a smelting dilute acid deep purification and filtration device aiming at the problems existing in the prior art.

In order to achieve the above purpose, the specific technical scheme of the utility model is as follows:

a smelting dilute acid deep purification and filtration device comprises a buffer tank, a primary filter, a primary filtrate tank, a secondary filter, a secondary filtrate tank, a tertiary filter, a bottom launder, a filter press and a sewage tank; the buffer tank is used for receiving dilute acid solution conveyed by the purification process in a pressurizing mode, a liquid outlet of the buffer tank is connected with a liquid inlet of a primary filter, the primary filter is provided with an upper filtrate outlet and an underflow liquid outlet, the upper filtrate outlet of the primary filter is connected with a primary filtrate tank through a pipeline, the underflow liquid outlet is connected with the underflow tank through a pipeline, the liquid outlet of the primary filtrate tank is connected with a liquid inlet of a secondary filter through a pipeline, the secondary filter is provided with an upper filtrate outlet and a sewage outlet, the upper filtrate outlet of the secondary filter is connected with a secondary filtrate tank through a pipeline, the sewage outlet is connected with a sewage tank, the liquid outlet of the secondary filtrate tank is connected with a liquid inlet of a tertiary filter, the filtrate outlet of the tertiary filter is connected with a rhenium recovery process, the sewage outlet of the tertiary filter is connected with the sewage tank through a pipeline, the liquid outlet of the sewage tank is connected with the liquid inlet of the buffer tank through a pipeline, and the outlet of the sewage tank is connected with a filter press through a pipeline.

Further, the primary filter is a filler filter, the filler diameter of the filler filter is 1.0-2.0 mm, the secondary filter is a Gobi filter, the filter pore diameter of the Gobi filter is 5 mu m, the tertiary filter is a precise filter, and the filter pore diameter of the precise filter is 1 mu m.

Further, feed liquid conveying pumps are arranged on the pipeline between the primary filter tank and the secondary filter, the pipeline between the secondary filter tank and the tertiary filter, the pipeline between the sewage draining tank and the buffer tank and the pipeline between the underflow tank and the filter press.

Further, a first pressure gauge is arranged on a pipeline between the primary filter tank and the secondary filter, and a second pressure gauge is arranged on a pipeline between the secondary filter tank and the tertiary filter; the pipeline between the primary filter and the underflow groove is provided with a first blow-down valve, the pipeline between the secondary filter and the blow-down tank is provided with a second blow-down valve, and the pipeline between the tertiary filter and the blow-down tank is provided with a third blow-down valve.

Preferably, the first pressure gauge and the second blow-down valve are connected in a signal feedback control manner so as to realize automatic back flushing interlocking control of the secondary filter, and the second pressure gauge and the third blow-down valve are connected in a signal feedback control manner so as to realize automatic back flushing interlocking control of the tertiary filter.

Preferably, the buffer tank is provided with an exhaust hole.

The buffer tank is used for receiving the dilute acid solution conveyed by the purification process in a pressurized mode, and is mainly used for decompressing the dilute acid solution and beneficial to subsequent solid-liquid separation.

The sewage draining tank is used for collecting and storing concentrated sewage discharged by the secondary filter and the tertiary filter; and the sewage draining tank is communicated with the buffer tank in a backflow way through a pipeline, and the concentrated sewage returns to the system for re-filtering.

The underflow groove is used for collecting and storing slurry discharged by the filler filter; the underflow groove is communicated with a feed inlet of the filter press through a pipeline.

The filter press is used for solid-liquid separation of slurry; the filter residues output from the slag outlet of the filter press are sold; and returning filtrate output by a liquid outlet of the filter press to the purification process for recycling.

Preferably, the whole filler filter is of a glass fiber reinforced plastic structure and can be automatically backwashed; the filler filter is internally provided with a polymer filter filler with an electrostatic adsorption function.

Preferably, the electronic pressure gauge on the primary filtrate pipeline II is in signal feedback control connection with the sewage valve on the sewage pipeline II, so that automatic back flushing interlocking control of the Gobi filter is realized.

Preferably, the electronic pressure gauge on the secondary filtrate pipeline II is in signal feedback control connection with the sewage valve on the sewage pipeline I, so that automatic back flushing interlocking control of the precise filter is realized.

In the device, the buffer tank is used for decompressing the dilute acid solution; the first-stage filter is used for first-stage purification and filtration of dilute acid solution and solid-liquid separation of large-particle suspended matters in dilute acid; the secondary filter is used for carrying out secondary purification and filtration on the dilute acid solution subjected to the primary purification and filtration so as to remove most of fine particles in the filtrate; the third-stage filter is used for carrying out third-stage purification and filtration on the dilute acid solution subjected to the second-stage purification and filtration so as to remove the residual ultrafine particles in the filtrate, and the filtrate subjected to the precise filtration is sent to a rhenium recovery process; the mud precipitated by the first-stage filter bottom flow enters a filter press to carry out solid-liquid separation, filter residues are sold out, and filtrate is returned to a purification process for recycling; when the inlet pressure of the secondary filter and the tertiary filter is too high, the concentrated sewage discharged by automatic back flushing returns to the buffer tank for re-filtration.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model can effectively separate the molten dilute acid solution and fine particulate impurities, realize stepped three-stage deep purification filtration, clarify the dilute acid solution after high-efficiency filtration, maintain the solid content below 1mg/L, completely meet the use requirement of a rhenium recovery procedure, prolong the service life of rhenium adsorption resin, improve the rhenium recovery rate, reduce the system blockage, improve the valuable filter residue yield, and simultaneously reduce the production load and the treatment cost of a downstream contaminated acid vulcanization system.

Drawings

FIG. 1 is a schematic view of the device connection structure of the present utility model;

reference numerals: 1. a buffer tank; 2. a filler filter; 3. a first stage filtrate tank; 4. a Golgi filter; 5. a second-stage filtrate tank; 6. a precision filter; 7. a bottom launder; 8. a filter press; 9. a blow-down tank; 10. a first pressure gauge; 11. a second pressure gauge; 101. a dilute acid pipeline; 102. a primary filtrate pipeline I; 103. a first-stage filtrate pipeline II; 104. a secondary filtrate pipeline I; 105. a secondary filtrate pipeline II; 106. a third-stage filtrate pipeline; 107. a sewage discharge pipeline I; 108. a sewage discharge pipeline II; 109. a sewage discharge pipeline III; 110. an underflow pipeline I; 111. an underflow pipeline II; 112. a slag outlet; 113. and a liquid outlet.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

Example 1:

a smelting dilute acid deep purification filter device is shown in figure 1, and comprises a buffer tank 1, a filler filter 2, a primary filtrate tank 3, a Gobi filter 4, a secondary filtrate tank 5, a precision filter 6, an underflow tank 7, a filter press 8, a blowdown tank 9 and the like, wherein the liquid outlet of the buffer tank 1 is connected with the liquid inlet of the filler filter 2 through a dilute acid pipeline 101, the filler filter 2 is provided with an upper filtrate outlet and an underflow liquid outlet, the upper filtrate outlet is connected with the primary filtrate tank 3 through a primary filtrate pipeline I102, the liquid outlet of the primary filtrate tank 3 is connected with the liquid inlet of the Gobi filter 4 through a primary filtrate pipeline II103, the Gobi filter 4 is provided with an upper filtrate outlet and a blowdown port, the upper filtrate outlet is connected with the precision filter 6 through a secondary filtrate pipeline I104 and the secondary filtrate tank 5, the liquid outlet of the precision filter 6 is connected with the precision filter 6 through a filtrate outlet and a blowdown port, the filtrate outlet is connected with a rhenium recovery process through a tertiary filtrate pipeline 106 and a rhenium recovery process, the blowdown port of the precision filter 6 is connected with the blowdown port through a primary filtrate pipeline I107 and a blowdown tank 9, the liquid outlet of the Gobi filter 4 is connected with the underflow port of the drain tank 9 through a filter press 7 and the underflow port 7 is connected with the underflow port of the drain port 1 through a drain port II and a drain port 7, and the drain port of the drain port is connected with the drain port of the drain port 1 is connected with the drain port 1 through a drain port III and the drain port 7 is connected with the drain port 1 through a drain port and the drain port 7.

The first-stage filtrate pipeline II103, the second-stage filtrate pipeline II105 and the underflow pipeline II111 of the sewage pipeline III109 are all provided with conveying pumps.

The first-stage filtrate pipeline II103 is provided with a first pressure gauge 10, the second-stage filtrate pipeline II105 is provided with a second pressure gauge 11, the underflow pipeline I110 is provided with a first blow-down valve, the blow-down pipeline II108 is provided with a second blow-down valve, the blow-down pipeline I107 is provided with a third blow-down valve, the first pressure gauge 10 and the second blow-down valve are connected in a signal feedback control manner so as to realize automatic back flushing interlocking control of the Gobi film filter 4, and the second pressure gauge 11 and the third blow-down valve are connected in a signal feedback control manner so as to realize automatic back flushing interlocking control of the precision filter 6.

The buffer tank 1 is used for decompressing the dilute acid solution, the filler filter 2 is used for primary purification and filtration of the dilute acid solution, the Gobi film filter 4 is used for secondary purification and filtration of the dilute acid solution after primary purification and filtration, the precise filter 6 is used for tertiary purification and filtration of the dilute acid solution after secondary purification and filtration, and the filtrate after precise filtration is sent to a rhenium recovery process. The mud precipitated by the underflow of the filler filter 2 enters a filter press 8 for solid-liquid separation, filter residues are sold out, and filtrate is returned to a purification process for recycling. When the inlet pressure of the Gobi film filter 4 and the precise filter 6 is too high, the concentrated sewage discharged by automatic back flushing returns to the buffer tank 1 for re-filtration.

Specifically, the buffer tank 1 in this embodiment is configured to receive a dilute acid solution pressurized and conveyed in a purification process, and is mainly used to decompress the dilute acid solution, SO as to facilitate subsequent solid-liquid separation, where the buffer tank 1 is provided with an exhaust hole for releasing SO dissolved in the dilute acid solution ₂ The liquid outlet of the filter is communicated with the filler filter 2 through a dilute acid pipeline 101. The filler filter 2 is integrally of a glass fiber reinforced plastic structure, is internally provided with polymer filter fillers with electrostatic adsorption function, can automatically back flush and is used for primary purification and filtration of dilute acid solution, solid-liquid separation is carried out on large-particle suspended matters in dilute acid, upper filtrate flows into the primary filtrate tank 3 through the primary filtrate pipeline I102, and underflow slurry deposited at the bottom of a cone after filtration flows into the underflow groove 7 through the underflow pipeline I110.

The primary filtrate tank 3 is communicated with the Gobi filter 4 through a primary filtrate pipeline II 103. The Gobi filter 4 is used for carrying out secondary purification and filtration on the primary filtrate so as to remove most of fine particles in the filtrate, the upper filtrate flows into the secondary filtrate tank 5 through the secondary filtrate pipeline I104, the concentrated sewage deposited at the bottom after filtration flows into the sewage tank 9 through the sewage pipeline II108, and the sewage pipeline II108 is provided with a sewage valve. The secondary filtrate tank 5 is communicated with the precise filter 6 through a secondary filtrate pipeline II105, and the precise filter 6 is used for performing precise purification and filtration on the secondary filtrate again so as to remove residual superfine microparticles in the filtrate; the liquid outlet of the device is used for conveying filtered tertiary filtrate to a rhenium recovery process for treatment through a tertiary filtrate pipeline 106, filtered concentrated sewage flows into a sewage tank 9 from a bottom sewage outlet through a sewage pipeline I107, and the sewage pipeline I107 is provided with a sewage valve.

The blowdown tank 9 is used for collecting and storing concentrated dirty liquid discharged by the Gobi film filter 4 and the precise filter 6, and is communicated to the buffer tank 1 in a backflow mode through a blowdown pipeline III109, and the concentrated dirty liquid returns to the system to be filtered again, so that the whole purifying and filtering effects of the dilute acid solution are guaranteed.

The bottom launder 7 is used for collecting and storing slurry discharged by the filler filter 2, and the liquid outlet of the bottom launder is communicated with the feed inlet of the filter press 8 through the bottom flow pipeline II 111. The filter press 8 is used for solid-liquid separation of slurry, the filter residue output by the slag outlet 112 is sold, and the filtrate output by the liquid outlet 113 is returned to the purification process for recycling.

Taking a certain smelting dilute acid which needs to be treated during the production of a copper smelting plant as an example, the specific parameters are as follows:

concentration of sulfuric acid	Solid content of feed liquid	Dilute acid temperature	Fluorine content
				12%	3.5g/L	65℃	3g/L

1. In the purification process, dilute acid solution is sent into the buffer tank 1 through a delivery pump, the buffer tank 1 is used for decompressing the dilute acid solution, the pressure is reduced from 0.3MPa to 0.10MPa, and the dilute acid solution slowly enters the filler filter 2.

2. The filler filter 2 carries out primary purification and filtration on dilute acid solution, the solid content of the upper filtrate is 30mg/L, then the dilute acid solution enters the Gobi filter 4 for further treatment through the primary filtrate tank 3, the solid content of the underflow slurry of the filler filter 2 is about 20%, the slurry is automatically discharged once every 6 hours, the filler back flushing is realized while the slurry is discharged, the slurry is treated through the filter press 8, the filter residues are sold, and the filtrate is returned to the purification process for recycling.

3. The dilute acid solution is subjected to secondary purification and filtration by the Gobi film filter 4, the solid content of the filtered filtrate is reduced from 30mg/L to 5mg/L, and then the filtered filtrate enters the precise filter 6 for further treatment through the secondary filtrate tank 5. When the normal inlet pressure of the Gobi filter 4 is less than 0.30MPa and the outlet filtrate is clear, when the inlet pressure is more than or equal to 0.30MPa, the Gobi filter 4 opens the bottom drain valve and automatically performs back flushing interlocking control.

4. The precise filter 6 carries out three-stage purification and filtration on dilute acid solution, the solid content of filtrate after filtration is reduced from 5mg/L to below 1mg/L, the normal inlet pressure of the precise filter 6 is less than 0.25MPa, the inlet pressure is basically unchanged, the effluent filtrate is clear, the filtrate is qualified clear liquid at the moment and is sent to rhenium recovery working procedure for treatment, pollution discharge backflushing is carried out manually once per day normally, if the pollution discharge liquid is clear, the precise filter has good treatment effect and less slag accumulation, and when the inlet pressure is more than or equal to 0.25MPa, the precise filter 6 opens a bottom pollution discharge valve and automatically carries out backflushing interlocking control.

5. The concentrated sewage discharged by the Gobi film filter 4 and the precise filter 6 is returned to the system for re-filtering, so that the whole purifying and filtering effect of the dilute acid solution is ensured.

Finally, it should be noted that: the above examples are provided for illustrating the technical solution of the present utility model and are not to be construed as limiting the present utility model, and it should be understood by those skilled in the art that any equivalent or obvious modification of the embodiments of the present utility model without changing the performance or use thereof without departing from the spirit of the present utility model is intended to be included in the scope of the present utility model as claimed.

Claims (6)

1. The smelting dilute acid deep purification and filtration device is characterized by comprising a buffer tank, a primary filter, a primary filtrate tank, a secondary filter, a secondary filtrate tank, a tertiary filter, a bottom launder, a filter press and a sewage tank; the buffer tank is used for receiving dilute acid solution conveyed by the purification process in a pressurizing mode, a liquid outlet of the buffer tank is connected with a liquid inlet of a primary filter, the primary filter is provided with an upper filtrate outlet and an underflow liquid outlet, the upper filtrate outlet of the primary filter is connected with a primary filtrate tank through a pipeline, the underflow liquid outlet is connected with the underflow tank through a pipeline, the liquid outlet of the primary filtrate tank is connected with a liquid inlet of a secondary filter through a pipeline, the secondary filter is provided with an upper filtrate outlet and a sewage outlet, the upper filtrate outlet of the secondary filter is connected with a secondary filtrate tank through a pipeline, the sewage outlet is connected with a sewage tank, the liquid outlet of the secondary filtrate tank is connected with a liquid inlet of a tertiary filter, the filtrate outlet of the tertiary filter is connected with a rhenium recovery process, the sewage outlet of the tertiary filter is connected with the sewage tank through a pipeline, the liquid outlet of the sewage tank is connected with the liquid inlet of the buffer tank through a pipeline, and the outlet of the sewage tank is connected with a filter press through a pipeline.

2. The smelting dilute acid deep purification and filtration device according to claim 1, wherein the primary filter is a filler filter, the filler diameter of the filler filter is 1.0-2.0 mm, the secondary filter is a gol's membrane filter, the pore diameter of the gol's membrane filter is 5 μm, the tertiary filter is a precision filter, and the pore diameter of the precision filter is 1 μm.

3. The apparatus according to claim 1, wherein the transfer pump is provided in the line between the primary filter tank and the secondary filter, in the line between the secondary filter tank and the tertiary filter, in the line between the blowdown tank and the buffer tank, and in the line between the underflow tank and the filter press.

4. The smelting dilute acid deep purification and filtration device according to claim 1, wherein a first pressure gauge is arranged on a pipeline between the primary filter tank and the secondary filter, and a second pressure gauge is arranged on a pipeline between the secondary filter tank and the tertiary filter; the pipeline between the primary filter and the underflow groove is provided with a first blow-down valve, the pipeline between the secondary filter and the blow-down tank is provided with a second blow-down valve, and the pipeline between the tertiary filter and the blow-down tank is provided with a third blow-down valve.

5. The smelting dilute acid deep purification filter device according to claim 4, wherein the first pressure gauge and the second blow-down valve are connected in signal feedback control to realize automatic back flushing interlocking control of the secondary filter, and the second pressure gauge and the third blow-down valve are connected in signal feedback control to realize automatic back flushing interlocking control of the tertiary filter.

6. The smelting dilute acid deep purification and filtration device according to claim 1, wherein the buffer tank is provided with an exhaust hole.

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