CN215559478U - Heavy metal desorption system in acidizing fluid - Google Patents
Heavy metal desorption system in acidizing fluid Download PDFInfo
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- CN215559478U CN215559478U CN202121295019.5U CN202121295019U CN215559478U CN 215559478 U CN215559478 U CN 215559478U CN 202121295019 U CN202121295019 U CN 202121295019U CN 215559478 U CN215559478 U CN 215559478U
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Abstract
A system for removing heavy metals in acid liquor comprises a crude acid pump, a precipitant dissolving tank, a precipitant solution pump, a vulcanizing kettle, a stripping kettle, a slurry pump tank and an absorber, wherein the precipitant dissolving tank is provided with a first inlet and a second inlet, and the first inlet is connected with a water pipe and is provided with a switch; the vulcanizing kettle is provided with a top inlet and a side inlet; an outlet of the precipitator dissolving tank is connected with an inlet at the top of the vulcanizing kettle through a precipitator solution pump and a pipeline; the crude acid storage tank is connected with the inlet of the absorber through the crude acid pump and a pipeline; an outlet of the absorber is connected with a side inlet of the vulcanizing kettle through a pipeline; the absorber is also provided with an air inlet, the vulcanizing kettle is also provided with an air outlet, and the air outlet of the vulcanizing kettle is connected with the air inlet of the absorber through a pipeline. The method has simple flow, can repeatedly utilize the hydrogen sulfide gas, and has quick and sufficient reaction.
Description
Technical Field
The utility model relates to the field of wet smelting and chemical wastewater treatment, in particular to a system for removing heavy metals in acid liquor.
Background
For low-concentration heavy metal ions in the solution, metal hydroxide precipitation and metal sulfide precipitation methods are commonly adopted. The metal hydroxide precipitation method is to add strong base into the solution to adjust the pH of the solution to generate insoluble metal hydroxide, so as to separate heavy metals, and if the pH of the solution is adjusted to 4.3-5.6, Cr (OH) 3 ↓canbe precipitated; however, some metal ions will adjust the pH of the solution to a high level to form hydroxide precipitates, and the composition of the solution will change greatly, which will affect the intended use. Most of the insoluble heavy metal hydroxides are weak bases with different degrees, and will still pair with hydroxyl (Pb (OH)+、Pb(OH)3-) The heavy metal impurity ions exist in the solution, and the purification depth of the heavy metal impurity ions in the solution is influenced.
The metal sulfide precipitation method is derived from a hydrogen sulfide system analysis method, and hydrogen sulfide gas is introduced into the solution to generate heavy metal sulfide precipitate.
1. In the prior art, hydrogen sulfide needs to be prepared and applied independently, and the flow is complex. 2. The hydrogen sulfide is inflammable, toxic and malodorous gas, the concentration of heavy metal ions in the solution is low, the gas-liquid mass transfer rate of directly carrying out gas-liquid reaction on the hydrogen sulfide gas and the solution to be treated is low, the precipitation reaction rate is low, and the environment is polluted because the hydrogen sulfide cannot be fully utilized.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model aims to provide a system for removing heavy metals in acid liquor, which can recycle hydrogen sulfide gas, and sodium sulfide directly reacts with crude acid to be treated to generate hydrogen sulfide, and the hydrogen sulfide then performs precipitation reaction with heavy metal ions, so that the whole reaction is uniformly distributed and fully reacted.
In order to achieve the purpose, the utility model provides the following technical scheme:
a system for removing heavy metals in acid liquor comprises a crude acid pump, a precipitant dissolving tank, a precipitant solution pump, a vulcanizing kettle, a stripping kettle, a slurry pump tank and an absorber, wherein the precipitant dissolving tank is provided with a first inlet and a second inlet, and the first inlet is connected with a water pipe and is provided with a switch; the vulcanizing kettle is provided with a top inlet and a side inlet; an outlet of the precipitator dissolving tank is connected with an inlet at the top of the vulcanizing kettle through a precipitator solution pump and a pipeline;
the crude acid storage tank is connected with the inlet of the absorber through the crude acid pump and a pipeline; an outlet of the absorber is connected with a side inlet of the vulcanizing kettle through a pipeline;
the absorber is also provided with an air inlet, the vulcanizing kettle is also provided with an air outlet, and the air outlet of the vulcanizing kettle is connected with the air inlet of the absorber through a pipeline.
The outlet of the vulcanizing kettle is connected with the inlet of the stripping kettle through a pipeline, the outlet of the stripping kettle is connected with a slurry pump tank through a pipeline, and the slurry pump tank is connected with a filter press through a pipeline and a slurry pump; the precipitator dissolving tank, the absorber, the stripping kettle and the slurry pump tank are all provided with air outlets and are all connected to an induced draft fan through pipelines;
the stripping kettle is provided with an air inlet which is connected with an air pipe.
Preferably, the bottom of the absorber, the bottom of the vulcanizing kettle and the bottom of the stripping kettle are respectively provided with a bottom outlet and a switch, and the bottom outlets and the switches are respectively connected with the slurry pump groove through pipelines.
Preferably, the vulcanizing tanks can be connected in series continuously with one or more.
Preferably, the pipeline connected with the inlet of the absorber and the inlet at the top of the vulcanizing kettle is provided with a U-shaped bend, and the inlet at the top of the vulcanizing kettle is connected with a check valve.
Preferably, the vulcanizing kettle is provided with a vulcanizing kettle stirrer, and the absorber is provided with an absorber stirrer.
Compared with the prior art, the utility model has the following beneficial effects:
1. the gas outlet of the vulcanizing boiler 7 is connected with the gas inlet of the absorber 5 through a pipeline, the excessive hydrogen sulfide gas in the vulcanizing boiler 7 is pumped by using the stirring of the absorber 5 to form an air flow loop, and the air flow loop is formed by adding the negative pressure generated by the induced draft fan. The redundant hydrogen sulfide gas in the vulcanizing kettle 7 can be fully utilized to be absorbed into the absorber 5 to carry out primary precipitation reaction with the crude acid solution in the absorber 5.
2. Through setting up a plurality of vulcanization cauldron 7 and establishing ties, realize the multistage processing of crude acid solution, fully react heavy metal ion and precipitate.
3. By providing bottom outlets and switches at the bottom of the absorber 5, the sulfidizing tank 7, and the stripping tank 9, the crude acid solution can be drained off when necessary.
4. A U-shaped bend is arranged on a pipeline connected with an inlet of the absorber 5 and an inlet at the top of the vulcanizing kettle 7, so that hydrogen sulfide gas is prevented from reversely flowing into the sodium sulfide preparation tank through the liquid supply pipe, and safety accidents are prevented.
5. Sodium sulfide solution enters through the top inlet of the vulcanizing kettle 7 to react with the crude acid solution in the vulcanizing kettle 7 to generate hydrogen sulfide gas, the generated hydrogen sulfide gas reacts with heavy metal ions in the crude acid again, the two chemical reactions are carried out in the vulcanizing kettle 7, the process flow is simple, and the hydrogen sulfide gas is prepared without using an independent acid. Because the hydrogen sulfide gas is generally introduced into the crude acid solution, the problems of low heavy metal ion concentration in the solution, low gas-liquid mass transfer rate of gas-liquid reaction, low impurity precipitation reaction rate, long precipitation reaction time and insufficient reaction exist.
Drawings
FIG. 1 is a schematic diagram of a system for removing heavy metals from an acid solution;
FIG. 2 is a schematic view of the check valve;
FIG. 3 is a schematic view of a U-bend configuration of the pipe;
FIG. 4 is a schematic diagram of the absorber configuration;
description of reference numerals: 1. a crude acid pump; 2. a precipitant dissolving tank; 3. a precipitant solution pump; 4. an induced draft fan; 5. an absorber; 6. an absorber agitator; 7. a vulcanizing kettle; 8. a vulcanization kettle stirrer; 9. blowing off the kettle; 10. a stripping kettle stirrer; 11. a slurry pump tank; 12. a slurry pump; 5-2, circulating a barrel; 5-1, an impeller; 8-1, a stirring shaft; 8-2, a first stirring paddle; 8-3, a second stirring paddle; 8-4 and a check valve.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further described with the specific embodiments.
The utility model provides the following technical scheme:
example 1:
according to the drawings of fig. 1, fig. 2 and fig. 3, the system for removing heavy metals in acid liquor comprises a crude acid pump 1, a precipitant dissolving tank 2, a precipitant solution pump 3, a vulcanizing kettle 7, a stripping kettle 9, a slurry pump tank 11 and an absorber 5, wherein the precipitant dissolving tank 2 is provided with a first inlet and a second inlet, the first inlet is connected with a water pipe and is provided with a switch, the second inlet is used for adding sodium sulfide, and the sodium sulfide is fused with water to form a sodium sulfide solution; the vulcanizing kettle 7 is provided with a top inlet and a side inlet; an outlet of the precipitator dissolving tank 2 is connected with an inlet at the top of the vulcanizing kettle 7 through a precipitator solution pump 3 and a pipeline;
the crude acid storage tank is connected with an inlet of an absorber 5 through the crude acid pump 1 and a pipeline; an outlet of the absorber 5 is connected with a side inlet of the vulcanizing kettle 7 through a pipeline;
the absorber 5 is also provided with an air inlet, the vulcanizing kettle 7 is also provided with an air outlet, and the air outlet of the vulcanizing kettle 7 is connected with the air inlet of the absorber 5 through a pipeline.
An outlet of the vulcanizing kettle 7 is connected with an inlet of the stripping kettle 9 through a pipeline, an outlet of the stripping kettle 9 is connected with a slurry pump tank 11 through a pipeline, the slurry pump tank 11 is connected with a filter press through a pipeline and a slurry pump 12, and solid-liquid separation is carried out through the filter press, so that heavy metal ions in the crude acid solution are removed; the precipitator dissolving tank 2, the absorber 5, the stripping kettle 9 and the slurry pump tank 11 are all provided with air outlets and are all connected to the induced draft fan 4 through pipelines; the precipitator dissolving tank 2, the absorber 5, the stripping kettle 9 and the slurry pump tank 11 are ensured to be in a micro-negative pressure state through the induced draft fan 4. The absorber 5 is in a micro-negative pressure state and absorbs along with the absorptionThe stirring of the stirrer 6 sucks the excessive hydrogen sulfide gas in the vulcanizing boiler 7, and the excessive hydrogen sulfide gas and the crude acid solution in the absorber 5 are subjected to primary precipitation reaction (Pb)2+ + 2H2S = PbS2↓+ 4H+、2As3++ 3H2S= As2S3↓+ 6H+). Then flows into the vulcanizing kettle 7.
The stripping kettle 9 is provided with an air inlet which is connected with an air pipe. The stripping kettle 9 is used for stripping the hydrogen sulfide gas in the crude acid solution.
The bottom of the absorber 5, the bottom of the vulcanizing kettle 7 and the bottom of the stripping kettle 9 are provided with a bottom outlet and a switch which are connected with the slurry pump tank 11 through pipelines. The switch is closed under normal conditions, and when the solution in the absorber 5, the vulcanizing kettle 7 and the stripping kettle 9 needs to be drained, the switch is opened, and the slurry can be drained to the slurry pump tank 11.
The two vulcanizing kettles 7 can be connected in series, so that the precipitation reaction is more thorough.
The pipeline connected with the inlet of the absorber 5 and the inlet at the top of the vulcanizing kettle 7 is provided with a U-shaped bend, and the inlet at the top of the vulcanizing kettle 7 is connected with a check valve 8-4. The U-shaped bend and the check valve 8-4 can prevent hydrogen sulfide gas from reversely flowing into the sodium sulfide preparation tank through the liquid supply pipe to cause safety accidents.
The gas inlet of the absorber 5 is inclined towards the liquid surface and is slightly higher than the outlet of the absorber 5.
The vulcanizing kettle 7 is provided with a vulcanizing kettle stirrer 8, and the absorber 5 is provided with an absorber stirrer 6.
Sodium sulfide solution is added from the top inlet of the vulcanizing boiler 7 through the check valve 8-4 to react with the crude acid solution in the vulcanizing boiler 7 to produce hydrogen sulfide gas (Na)2S + 2H+ = 2Na+ + H2S ↓) is stirred by the stirrer 8 of the vulcanizing kettle to scatter the hydrogen sulfide gas, which is then distributed evenly with the heavy metal ions (Pb ×)2+、Cd2+、As3+、Hg2+、Cr3+) And (3) precipitation reaction is generated, and the reaction is sufficient.
Example 2:
the difference from the embodiment 1 is that the stirrer 6 of the absorber 5 is provided with a circulating barrel 5-2 and an impeller 5-1, the circulating barrel 5-2 is hollow, and the bottom of the circulating barrel is communicated with the inside of the absorber. The center of the circulating barrel 5-2 is provided with a stirring shaft, the bottom of the stirring shaft is provided with an impeller 5-1, and the impeller 5-1 is arranged below the circulating barrel 5-2. An air inlet of the absorber 5 leads to the inside of the circulating barrel 5-2, and the circulating barrel 5-2 is provided with a through hole at the liquid level position to lead to the absorber 5.
The solution in the absorber 5 can enter the circulating barrel 5-2, the impeller 5-1 rotates rapidly, the solution in the circulating barrel 5-2 rotates to generate vortex, air around the vortex generates suction according to the Venturi principle, hydrogen sulfide gas at an air inlet of the absorber 5 is sucked and reacts with heavy metal ions in the solution, and the hydrogen sulfide gas is discharged into the absorber 5 through the through hole at the liquid level position to generate precipitation reaction again. Because of the negative pressure state of the absorber 5, the excess gas can be pumped away by the induced draft fan 4.
The second difference is that a stirring shaft 8-1 of a vulcanizing kettle stirrer 8 is hollow, an inlet at the top of a vulcanizing kettle 7 is arranged at the top of the stirring shaft 8-1, a check valve 8-4 is arranged at the bottom of the stirring shaft 8-1, and the stirring shaft of the vulcanizing kettle is provided with a first stirring paddle 8-2 and a second stirring paddle 8-3. The check valve is arranged to prevent hydrogen sulfide gas from reversely entering the sodium sulfide preparation tank through the liquid supply pipe, so that safety accidents are caused. Through setting up hollow (mixing) shaft, add sodium sulfide solution from the (mixing) shaft top, follow the ejection of compact of (mixing) shaft bottom and get into vulcanization kettle 7 again, through first stirring rake stirring, react with the crude acid solution in vulcanization kettle 7 and produce hydrogen sulfide gas body (Na)2S + 2H+ = 2Na+ + H2S ×) and the hydrogen sulfide gas is uniformly distributed to the heavy metal ions (Pb)2+、Cd2+、As3+、Hg2+、Cr3+) A precipitation reaction occurs. Because first stirring rake paddle broad can hinder the bubble fast rising, and the bubble can be broken up to the second stirring rake, lets its abundant reaction, can not rise fast.
The principle is as follows:
the crude acid solution is pumped into the absorber 5 by the crude acid pump 1 and overflows to the vulcanizing boiler 7. The first entry and the second entry of precipitant dissolving tank 2 are the feed inlet of water and sodium sulfide respectively, it fuses at precipitant dissolving tank 2 and generates sodium sulfide solution, take out to the top entry of vulcanization kettle 7 through precipitant solution pump 3, inside the check valve entering vulcanization kettle 7 of (mixing) shaft bottom of vulcanization kettle 7, and the stirring is even under the effect of first stirring rake and the going on of crude acid solution reacts, produce hydrogen sulfide gas, because the great bubble that can obstruct of first stirring rake blade rises, make hydrogen sulfide fully react with heavy metal ion. The bubbles are scattered and finely crushed by the second stirring paddle, so that the bubbles are further fully reacted with the heavy metal ions.
Generally, the hydrogen sulfide gas is independently introduced, and the heavy metal ion concentration in the solution is low, the gas-liquid mass transfer rate of the gas-liquid reaction is low, the impurity precipitation reaction rate is low, the precipitation reaction time is long, and the reaction is insufficient. However, the utility model does not need to additionally prepare acid and sodium sulfide to react to prepare hydrogen sulfide gas in the whole process, and because the prepared hydrogen sulfide gas and the precipitation reaction of the hydrogen sulfide and the heavy metal ions are combined together, the reaction in the whole process is fast under the action of stirring, and the generated hydrogen sulfide is uniformly distributed and can fully react with the heavy metal ions in the crude acid solution. The arrangement of the multiple vulcanizing kettle 7 ensures that the heavy metal ions of the crude acid solution are all consumed by reaction.
The redundant hydrogen sulfide gas can enter the absorber 5 due to the negative pressure state generated by the induced draft fan 4 and the stirring effect of the absorber 5, and the redundant hydrogen sulfide gas is recycled to perform precipitation reaction with heavy metal ions in the crude acid solution of the absorber 5. And finally, pumping away the residual waste gas of the precipitator dissolving tank 2, the absorber 5, the stripping kettle 9 and the slurry pump tank 11 by the induced draft fan 4 to treat the waste gas.
When the whole system is cleaned, the switches at the bottoms of the absorber 5, the vulcanizing kettle 7 and the stripping kettle 9 can be opened, and the residual solution in the absorber can be discharged to the slurry pump tank 11.
By setting two safety measures of a check valve and a U-shaped bend, the situation that after liquid supply is stopped, hydrogen sulfide gas reversely enters a sodium sulfide preparation tank through a liquid supply pipe to cause safety accidents is prevented.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A system for removing heavy metals in acid liquor comprises a crude acid pump (1), a precipitant dissolving tank (2), a precipitant solution pump (3), a vulcanizing kettle (7), a stripping kettle (9) and a slurry pump tank (11), and is characterized by further comprising an absorber (5), wherein the precipitant dissolving tank (2) is provided with a first inlet and a second inlet, and the first inlet is connected with a water pipe and provided with a switch; the vulcanizing kettle (7) is provided with a top inlet and a side inlet; an outlet of the precipitator dissolving tank (2) is connected with a top inlet of a vulcanizing kettle (7) through a precipitator solution pump (3) and a pipeline;
the crude acid storage tank is connected with an inlet of an absorber (5) through the crude acid pump (1) and a pipeline; an outlet of the absorber (5) is connected with a side inlet of the vulcanizing kettle (7) through a pipeline;
the absorber (5) is also provided with an air inlet, the vulcanizing kettle (7) is also provided with an air outlet, and the air outlet of the vulcanizing kettle (7) is connected with the air inlet of the absorber (5) through a pipeline;
an outlet of the vulcanizing kettle (7) is connected with an inlet of the stripping kettle (9) through a pipeline, an outlet of the stripping kettle (9) is connected with a slurry pump tank (11) through a pipeline, and the slurry pump tank (11) is connected with a filter press through a pipeline and a slurry pump (12); the precipitator dissolving tank (2), the absorber (5), the stripping kettle (9) and the slurry pump tank (11) are all provided with air outlets and are all connected to the induced draft fan (4) through pipelines;
the stripping kettle (9) is provided with an air inlet which is connected with an air pipe.
2. The system for removing heavy metals in acid liquor as claimed in claim 1, wherein the bottom of the absorber (5), the bottom of the vulcanizing kettle (7) and the bottom of the stripping kettle (9) are provided with a bottom outlet and a switch, and the bottom outlets and the switches are connected with the slurry pump tank (11) through pipelines.
3. A system for removing heavy metals from acid liquor as claimed in claim 1, wherein the sulfurizing kettles (7) are connected in series one or more continuously.
4. A system for removing heavy metals from acid liquor according to claim 1, wherein the pipeline connected with the inlet of the absorber (5) and the top inlet of the vulcanizing boiler (7) is provided with a U-shaped bend, and the top inlet of the vulcanizing boiler (7) is connected with a check valve (8-4).
5. A system for removing heavy metals from acid liquor according to claim 1, wherein the vulcanizing boiler (7) is provided with a vulcanizing boiler stirrer (8), and the absorber (5) is provided with an absorber stirrer (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121295019.5U CN215559478U (en) | 2021-06-10 | 2021-06-10 | Heavy metal desorption system in acidizing fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121295019.5U CN215559478U (en) | 2021-06-10 | 2021-06-10 | Heavy metal desorption system in acidizing fluid |
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| Publication Number | Publication Date |
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| CN215559478U true CN215559478U (en) | 2022-01-18 |
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| CN202121295019.5U Active CN215559478U (en) | 2021-06-10 | 2021-06-10 | Heavy metal desorption system in acidizing fluid |
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- 2021-06-10 CN CN202121295019.5U patent/CN215559478U/en active Active
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