CN213012150U - Device for removing heavy metal impurities by using hydrogen sulfide - Google Patents
Device for removing heavy metal impurities by using hydrogen sulfide Download PDFInfo
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- CN213012150U CN213012150U CN202021485092.4U CN202021485092U CN213012150U CN 213012150 U CN213012150 U CN 213012150U CN 202021485092 U CN202021485092 U CN 202021485092U CN 213012150 U CN213012150 U CN 213012150U
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Abstract
The utility model provides a device for removing heavy metal impurities by adopting hydrogen sulfide, which comprises a dilute acid storage container, an alkali sulfide dissolving container, a hydrogen sulfide generator, an impurity removal reaction container, a neutralization stirring container and a tail gas absorption container; the dilute acid storage container and the sodium sulfide dissolving container are respectively connected with an inlet of a hydrogen sulfide generator, a gas outlet of the hydrogen sulfide generator is connected with an air inlet pipe of the impurity removal reaction container through a first injection pump, the neutralization stirring container is connected with a liquid inlet of the impurity removal reaction container through a pipeline, and a gas outlet of the impurity removal reaction container is connected with an air inlet pipeline of the tail gas absorption container through a second injection pump; the impurity removal reaction container and the hydrogen sulfide generator are provided with a vacuum pressure gauge, a liquid level meter and an emptying pipe, and the tail gas absorption container is provided with an emptying pipe. Adopt the technical scheme of the utility model, the security is high, and the tail gas absorbs thoroughly, has obvious environmental protection effect, flexible operation.
Description
Technical Field
The utility model relates to a gas-liquid reaction unit especially relates to an adopt hydrogen sulfide to get rid of heavy metal impurity's device.
Background
The method for removing harmful heavy metal impurities in solution by using sulfide precipitation is a common impurity removal method in the field of hydrometallurgy. Based on the principle that the solubility products of most metal sulfides are extremely small and the solubility products of different metal sulfides are different at specific pH values, the heavy metal impurities in the solution can be effectively removed by controlling the using amount of the sulfides. The sulfide precipitation method has the advantages of high removal rate of heavy metal impurities, difficult re-dissolution of impurities, high reaction speed and the like, and is widely applied to the treatment process of nickel-cobalt solution, manganese sulfate solution or wastewater. Because the direct addition of solid sulfide can cause the accumulation of unnecessary ions such as sodium, potassium, ammonium and the like in a solution, which is unfavorable for a production system, the conventional sulfide precipitation method usually converts solid sodium sulfide into hydrogen sulfide gas first and then removes impurities, and the basic flow is as follows: sodium sulfide and dilute sulfuric acid react in a closed container to prepare hydrogen sulfide gas, the hydrogen sulfide gas is introduced into a circulating jet pump of a reaction tank to carry out gas-liquid two-phase reaction under the action of negative pressure suction, and after the reaction, slurry is subjected to solid-liquid separation to achieve the purpose of removing impurities. Because the hydrogen sulfide belongs to extremely toxic gas, in order to ensure the operation safety, the operation processes of hydrogen sulfide preparation, use, tail gas absorption and the like are required to be carried out in closed reaction equipment; meanwhile, process parameters (such as reaction time and solution pH) need to be monitored and adjusted in the hydrogen sulfide impurity removal reaction process so as to achieve the expected impurity removal effect.
The hydrogen sulfide impurity removal process is carried out in a completely closed negative pressure environment due to safety requirements, and equipment still needs to have operation flexibility on the premise of ensuring sealing in order to ensure the impurity removal effect, so that the hydrogen sulfide impurity removal process has higher requirements on the device. At present, the hydrogen sulfide impurity removal device generally has the defects of inflexible equipment operation, inconvenient process parameter adjustment, low utilization rate of hydrogen sulfide, and dissolved residual H in impurity-removed liquid2Large S amount, incomplete tail gas absorption and the like.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model discloses a device for removing heavy metal impurities by using hydrogen sulfide, which has high safety, can conveniently control the operation time of impurity removal, adjust the pH value of the solution and ensure the effect of impurity removal; by adding aeration facilities, a large amount of residual H in the solution after impurity removal can be removed2And S, the dosage of the oxidant in the subsequent process is reduced.
To this end, the technical scheme of the utility model is that:
a device for removing heavy metal impurities by using hydrogen sulfide comprises a dilute acid storage container, an alkali sulfide dissolving container, a hydrogen sulfide generator, an impurity removal reaction container for containing a solution to be treated, a neutralization stirring container for containing a substance capable of neutralizing and reacting with acid, and a tail gas absorption container for containing a hydrogen sulfide purification solution;
the dilute acid storage container and the sodium sulfide dissolving container are respectively connected with an inlet of a hydrogen sulfide generator, a gas outlet of the hydrogen sulfide generator is connected with an air inlet pipe of the impurity removal reaction container through a first injection pump, the neutralization stirring container is connected with a liquid inlet of the impurity removal reaction container through a pipeline, and a gas outlet of the impurity removal reaction container is connected with an air inlet pipeline of the tail gas absorption container through a second injection pump;
the impurity removal reaction container and the hydrogen sulfide generator are provided with a vacuum pressure gauge, a liquid level meter and an emptying pipe, and the tail gas absorption container is provided with an emptying pipe;
the liquid outlet of the impurity removal reaction vessel is connected with a first centrifugal pump, and the first centrifugal pump is connected with a first jet pump through a circulating pipe;
and a liquid outlet of the tail gas absorption container is connected with a second centrifugal pump, and the second centrifugal pump is connected with a second jet pump through a circulating pipe.
The process for removing heavy impurities by using hydrogen sulfide generally has multiple excessive hydrogen sulfide in order to meet the purification requirement. Excess hydrogen sulfide gas will dissolve in the purified solution (1 volume of water will dissolve 2.6 volumes of hydrogen sulfide), which in aqueous solution will dissociate according to the following equation:
the solution of hydrogen sulfide after removing impurities is added with oxidant to remove dissolved hydrogen sulfide gas, otherwise the solution will have adverse effect on the quality of subsequent products, such as: the electrolytic solution contains a reducing substance S2-The electrolytic product can be blackened and crisp, and the sulfur content exceeds the standard; the liquid before evaporative crystallization contains S2-In the course of evaporative crystallization of S2-Will be oxidized to precipitate S0The simple substance causes the product to generate yellow color, the water insoluble substance exceeds the standard and the like.
The technical scheme of the utility model through increasing the evacuation pipe, under the centrifugal pump drives, make the negative pressure effect in edulcoration reaction vessel, the tail gas absorption container under, open the evacuation pipe, carry out air aeration at the reaction later stage, strengthen the reaction through the aeration in the jet pump, O in the air2And H2S is subjected to redox reaction, and the reaction equation is as follows:
O2+2H2S＝2H2O+2S0↓ (at low temperature)
Thus, the majority of the dissolved hydrogen sulfide is replaced by O2Oxidation, O in air2Here an unprovoked oxidant. Since most of the dissolved hydrogen sulfide is eliminated by oxidation during the aeration period, H is removed during the filtration of the solution2S gas overflow hazards are reduced, and oxidizing agents for subsequent sulfur removal are reduced.
As a further improvement of the utility model, the bottom of the hydrogen sulfide generator is connected with a third centrifugal pump through a valve, and the third centrifugal pump is connected with the upper inlet of the hydrogen sulfide generator through a circulating pipe.
As a further improvement of the utility model, the air inlet pipe extends into the middle lower part in the impurity removal reaction vessel; the gas inlet pipeline extends into the middle lower part in the tail gas absorption container.
As a further improvement of the utility model, a first sampling port is arranged on a pipeline connected with the outlet of the first centrifugal pump; and a second sampling port is arranged on a pipeline connected with the outlet of the second centrifugal pump, and a third sampling port is arranged on a pipeline connected with the outlet of the third centrifugal pump.
As a further improvement of the utility model, a flowmeter is arranged on a connecting pipeline of the dilute acid storage container and the inlet of the hydrogen sulfide generator.
As a further improvement of the utility model, the pipelines of the inlet connection of the dilute acid storage container, the sodium sulfide dissolving container and the hydrogen sulfide generator are all provided with a liquid inlet valve.
As a further improvement of the utility model, the emptying pipe is provided with a switch valve.
As a further improvement of the utility model, a stirring device is arranged in the hydrogen sulfide generator.
Compared with the prior art, the beneficial effects of the utility model are that:
by adopting the technical scheme of the utility model, the device has high safety and can monitor the negative pressure condition of the equipment in time; the operation is flexible, the operation is simple and convenient, and the impurity removal reaction process parameters can be flexibly adjusted according to the requirement; in addition, the device has an aeration function, and can eliminate a large amount of dissolved H2S, stopping H during filtering2S, reducing the consumption of sulfur-removing oxidant, and finally adopting a jet pump to strengthen the reactionThe hydrogen sulfide tail gas absorption is responded, the tail gas absorption is thorough, and the environment-friendly effect is obvious.
Drawings
Fig. 1 is a schematic structure of the device for removing heavy metal impurities by using hydrogen sulfide.
The reference numerals include:
1-an alkali sulfide dissolving tank, 2-a dilute sulfuric acid tank, 3-a hydrogen sulfide generator, 4-a heavy metal removal reaction tank, 5-a tail gas absorption tank, 6-a neutralization stirring tank, 7-a flow meter, 8a, 8b and 8 c-vacuum pressure gauges, 9a and 9b, an emptying pipe, 10a and 10 b-jet pumps, 11a, 11b and 11 c-sampling pipe orifices, 12a and 12 b-liquid level observers, 13a, 13b and 13 c-centrifugal pumps, 14a, 14b and 14 c-circulating pipes.
Detailed Description
Preferred embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
As shown in figure 1, the device for removing heavy metal impurities by using hydrogen sulfide comprises a dilute sulfuric acid tank 2, an alkali sulfide dissolving tank 1, a hydrogen sulfide generator 3, a heavy metal removing reaction tank 4 for containing a solution to be treated, a neutralizing and stirring tank 6 for containing a substance capable of neutralizing and reacting with acid, and a tail gas absorption tank 5 for containing a hydrogen sulfide purification solution. Dilute sulfuric acid tank 2, alkali sulphide dissolving tank 1 are connected with hydrogen sulfide generator 3's entry respectively, hydrogen sulfide generator 3's gas outlet passes through the intake-tube connection of pipeline through jet pump 10a with removing heavy metal reaction tank 4, the intake-tube stretches into the well lower part that removes in the heavy metal reaction tank 4. The neutralizing and stirring tank 6 is connected with a liquid inlet of the heavy metal removing reaction tank 4 through a pipeline, and a gas outlet of the heavy metal removing reaction tank 4 is connected with a gas inlet pipeline of the tail gas absorption tank 5 through a pipeline and a jet pump 10 b; the air inlet pipe extends into the middle lower part of the tail gas absorption tank 5. The hydrogen sulfide generator 3 is provided with a vacuum pressure gauge 8a, a liquid level meter and an emptying pipe 9a, the heavy metal removing reaction tank 4 is provided with a vacuum pressure gauge 8b, a liquid level meter and an emptying pipe 9b, and the tail gas absorption tank 5 is provided with an emptying pipe 9 c.
The bottom of the hydrogen sulfide generator 3 is connected with a centrifugal pump 13a through a valve, and the centrifugal pump 13a is connected with the upper inlet of the hydrogen sulfide generator 3 through a circulating pipe 14 a.
The liquid outlet of the heavy metal removal reaction tank 4 is connected with a centrifugal pump 13b, and the centrifugal pump 13b is connected with a jet pump 10a through a circulating pipe 14 b; the liquid outlet of the tail gas absorption tank 5 is connected with a centrifugal pump 13c, and the centrifugal pump 13c is connected with the jet pump 10b through a circulating pipe 14 c.
The sampling pipe orifice 11a is arranged on the circulating pipe 14a at the outlet of the centrifugal pump 13a, the sampling pipe orifice 11b is arranged on the circulating pipe 14b at the outlet of the centrifugal pump 13b, the sampling pipe orifice 11c is arranged on the circulating pipe 14c at the outlet of the centrifugal pump 13c, and sampling points are all positioned on an outlet pipeline of the centrifugal pump.
And a flow meter 7 is arranged on a connecting pipeline of the dilute sulfuric acid tank 2 and the inlet of the hydrogen sulfide generator 3. And liquid inlet valves are arranged on pipelines connected with inlets of the dilute sulfuric acid tank 2, the alkali sulfide dissolving tank 1 and the hydrogen sulfide generator 3. The emptying pipes 9a, 9b and 9c are all provided with switch valves. And a stirring device is arranged in the hydrogen sulfide generator 3.
The following is a test for removing cadmium, lead, copper and zinc in a manganese sulfate solution by adopting the device, and the method comprises the following steps:
(1) a manganese sulfate solution containing a certain amount of cadmium, copper and zinc impurities is injected into the heavy metal removal reaction tank 4 in advance, the pH of the solution is adjusted to be in a proper range through the neutralization stirring tank 6, and the content of cadmium, lead, copper and zinc is sampled and analyzed;
(2) according to the content of cadmium, lead, copper and zinc, preparing quantitative sodium sulfide in a sodium sulfide dissolving tank 1, starting a neutralizing stirring tank 6 for stirring, starting a centrifugal pump 13b and a centrifugal pump 13c of a tail gas absorption tank 5 for self-circulation, closing an emptying pipe 9a of a hydrogen sulfide generator 3 and an emptying pipe 9b of a heavy metal removal reaction tank 4, keeping the emptying pipe 9c of the tail gas absorption tank 5 normally open, and generating negative pressure in the hydrogen sulfide generator 3 and the heavy metal removal reaction tank 4 under the suction action of an injection pump 10 a;
(3) feeding sodium sulfide solution into a hydrogen sulfide generator 3, closing each liquid inlet valve of the hydrogen sulfide generator 3, completely sealing the hydrogen sulfide generator 3, and starting a stirring device in the hydrogen sulfide generator 3 for stirring;
(4) after the negative pressure of the hydrogen sulfide generator 3 and the neutralization stirring tank 6 is stable, an acid inlet valve of the hydrogen sulfide generator 3 is opened, the acid inlet flow is adjusted according to the reaction time and the consumption of the dilute acid, and the acid flow is kept stable in the process;
(5) sampling from a sampling pipe orifice 11c of the hydrogen sulfide generator 3 every 15-20 minutes, detecting the pH, and adjusting by using a neutralizing agent of a neutralizing stirring tank if the pH is reduced;
(6) after the acid inlet amount meets the requirement, closing an acid inlet valve, opening the emptying pipes 9a and 9b, enabling air to flow backward from the emptying pipes 9a and 9b into the generator by negative pressure in the tank, and then feeding into the suction jet pumps 10a and 10b to aerate the impurity-removed liquid and the absorption liquid;
(7) taking the reacted liquid for analyzing the content of cadmium, lead, copper and zinc, sending the liquid for solid-liquid separation after the reaction liquid is qualified, and repeating the impurity removal process if the reaction liquid is not qualified;
(8) starting a centrifugal pump 13a of the hydrogen sulfide generator 3 for self-circulation for 3-5 minutes, sampling from a sampling pipe orifice 11a to detect the pH, and sending the generator residual liquid to water treatment after confirming that the pH of the generator residual liquid is less than 1.0;
(9) the centrifugal pump 13c of the tail gas absorption tank 5 in the whole impurity removal process keeps the running state so as to maintain the negative pressure state of the hydrogen sulfide generator 3 and the heavy metal removal reaction tank 4.
The device of the embodiment can monitor the negative pressure condition of the equipment in time, has good safety and aeration function, and can eliminate a large amount of dissolved H2S, is more environment-friendly and is flexible and simple to operate.
The above-mentioned embodiments are the preferred embodiments of the present invention, and the scope of the present invention is not limited to the above-mentioned embodiments, and the scope of the present invention includes and is not limited to the above-mentioned embodiments, and all equivalent changes made according to the shape and structure of the present invention are within the protection scope of the present invention.
Claims (8)
1. The utility model provides an adopt hydrogen sulfide to get rid of device of heavy metal impurity which characterized in that: the device comprises a dilute acid storage container, a sodium sulfide dissolving container, a hydrogen sulfide generator, an impurity removal reaction container for containing a solution to be treated, a neutralization stirring container for containing a substance capable of neutralizing and reacting with acid, and a tail gas absorption container for containing a hydrogen sulfide purification solution;
the dilute acid storage container and the sodium sulfide dissolving container are respectively connected with an inlet of a hydrogen sulfide generator, a gas outlet of the hydrogen sulfide generator is connected with an air inlet pipe of the impurity removal reaction container through a first injection pump, the neutralization stirring container is connected with a liquid inlet of the impurity removal reaction container through a pipeline, and a gas outlet of the impurity removal reaction container is connected with an air inlet pipeline of the tail gas absorption container through a second injection pump;
the impurity removal reaction container and the hydrogen sulfide generator are provided with a vacuum pressure gauge, a liquid level meter and an emptying pipe, and the tail gas absorption container is provided with an emptying pipe;
the liquid outlet of the impurity removal reaction vessel is connected with a first centrifugal pump, and the first centrifugal pump is connected with a first jet pump through a circulating pipe;
and a liquid outlet of the tail gas absorption container is connected with a second centrifugal pump, and the second centrifugal pump is connected with a second jet pump through a circulating pipe.
2. The apparatus for removing heavy metal impurities using hydrogen sulfide as claimed in claim 1, wherein: the bottom of the hydrogen sulfide generator is connected with a third centrifugal pump through a valve, and the third centrifugal pump is connected with an upper inlet of the hydrogen sulfide generator through a circulating pipe.
3. The apparatus for removing heavy metal impurities using hydrogen sulfide as claimed in claim 2, wherein: a first sampling port is arranged on a pipeline connected with the outlet of the first centrifugal pump; and a second sampling port is arranged on a pipeline connected with the outlet of the second centrifugal pump, and a third sampling port is arranged on a pipeline connected with the outlet of the third centrifugal pump.
4. The apparatus for removing heavy metal impurities using hydrogen sulfide as claimed in claim 3, wherein: and a flow meter is arranged on a connecting pipeline between the dilute acid storage container and the inlet of the hydrogen sulfide generator.
5. The apparatus for removing heavy metal impurities using hydrogen sulfide as claimed in claim 3, wherein: and liquid inlet valves are arranged on pipelines connecting the dilute acid storage container, the sodium sulfide dissolving container and the inlet of the hydrogen sulfide generator.
6. The apparatus for removing heavy metal impurities using hydrogen sulfide as claimed in claim 3, wherein: the emptying pipe is provided with a switch valve.
7. The device for removing heavy metal impurities by using hydrogen sulfide as claimed in any one of claims 1 to 6, wherein: and a stirring device is arranged in the hydrogen sulfide generator.
8. The apparatus for removing heavy metal impurities using hydrogen sulfide as claimed in claim 7, wherein: the gas inlet pipe extends into the middle lower part in the impurity removal reaction container; the gas inlet pipeline extends into the middle lower part in the tail gas absorption container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021485092.4U CN213012150U (en) | 2020-07-24 | 2020-07-24 | Device for removing heavy metal impurities by using hydrogen sulfide |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021485092.4U CN213012150U (en) | 2020-07-24 | 2020-07-24 | Device for removing heavy metal impurities by using hydrogen sulfide |
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| CN213012150U true CN213012150U (en) | 2021-04-20 |
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| CN202021485092.4U Active CN213012150U (en) | 2020-07-24 | 2020-07-24 | Device for removing heavy metal impurities by using hydrogen sulfide |
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