CN214570734U - Waste acid recovery device - Google Patents
Waste acid recovery device Download PDFInfo
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- CN214570734U CN214570734U CN202120287901.9U CN202120287901U CN214570734U CN 214570734 U CN214570734 U CN 214570734U CN 202120287901 U CN202120287901 U CN 202120287901U CN 214570734 U CN214570734 U CN 214570734U
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Abstract
The utility model provides a waste acid recovery device relates to material recovery equipment technical field. A waste acid recovery device comprises a multi-effect evaporator, wherein the multi-effect evaporator is communicated with a cooling crystallizer and a first condenser; the cooling crystallizer is communicated with a centrifuge, and the centrifuge is communicated with a calcining furnace. Adopt the utility model discloses, be convenient for handle the spent acid, retrieve and obtain iron oxide powder and hydrochloric acid solution, the energy of consumption is few, does benefit to the environmental protection.
Description
Technical Field
The utility model relates to a material recovery equipment technical field particularly, relates to a waste acid recovery device.
Background
Hydrochloric acid is an aqueous solution of hydrogen chloride, belongs to a strong inorganic acid, and has wide industrial application. The hydrochloric acid is colorless and transparent liquid, has strong pungent smell, and has high corrosivity. The concentrated hydrochloric acid (mass fraction is about 37%) has extremely strong volatility, so that hydrogen chloride gas can volatilize after a container containing the concentrated hydrochloric acid is opened, and the hydrogen chloride gas is combined with water vapor in the air to generate small drops of hydrochloric acid, so that acid mist appears above a bottle mouth. Hydrochloric acid is the main component of gastric acid and it promotes digestion of food and protects against microbial infections.
When metal rust removal is carried out in the existing industry, a large amount of hydrochloric acid is needed to carry out acid cleaning rust removal on the metal, a large amount of waste acid can be obtained after the metal is subjected to acid cleaning rust removal, and the waste acid contains a large amount of metal ions and chloride ions and hydrogen ions with lower concentrations. The waste acid cannot be directly discharged, and substances in the waste acid need to be recycled. The existing recovery technology is to dry the waste acid at high temperature (about 600 ℃) to obtain metal oxide, the hydrogen chloride in the waste acid can be evaporated, and the evaporated hydrogen chloride gas is absorbed by water spraying to form hydrochloric acid solution with the temperature of about 18-20 ℃. The drying temperature that this process needs to use is high, and the energy that consumes is many, is unfavorable for the environmental protection.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a waste acid recovery unit, it is convenient for handle the waste acid, retrieves and obtains iron oxide powder and hydrochloric acid solution, and the energy of consumption is few, does benefit to the environmental protection.
The embodiment of the utility model is realized like this:
the embodiment of the application provides a waste acid recovery device, which comprises a multi-effect evaporator, wherein the multi-effect evaporator is communicated with a cooling crystallizer and a first condenser; the cooling crystallizer is communicated with a centrifuge, and the centrifuge is communicated with a calcining furnace.
Further, in some embodiments of the present invention, a screw conveyor is disposed between the centrifuge and the calcining furnace, and the screw conveyor is respectively communicated with the centrifuge and the calcining furnace.
Further, in some embodiments of the present invention, the centrifuge is connected to a circulating pump, the circulating pump is connected to a venturi mixer, the venturi mixer is connected to the multiple-effect evaporator, and the calcining furnace is connected to the venturi mixer.
Further, in some embodiments of the present invention, a gas-liquid separator is disposed between the venturi mixer and the multi-effect evaporator, and the gas-liquid separator is respectively communicated with the venturi mixer and the multi-effect evaporator.
Further, in some embodiments of the present invention, the gas-liquid separator is further communicated with a second condenser.
Further, in some embodiments of the present invention, the above-mentioned further includes a water absorption tower, and the above-mentioned second condenser is communicated with the above-mentioned water absorption tower.
Further, in some embodiments of the present invention, the water absorption tower is communicated with an alkaline washing tower.
Further, in some embodiments of the present invention, the above-mentioned further includes a water absorption tower, and the above-mentioned first condenser is communicated with the above-mentioned water absorption tower.
Further, in some embodiments of the present invention, the water absorption tower is communicated with an alkaline washing tower.
Further, in some embodiments of the present invention, the calcining furnace is a reverberatory furnace.
Compared with the prior art, the embodiment of the utility model provides a have following advantage or beneficial effect at least:
the embodiment of the utility model provides a waste acid recovery device, which comprises a multi-effect evaporator, wherein the multi-effect evaporator is communicated with a cooling crystallizer and a first condenser; the cooling crystallizer is communicated with a centrifuge, and the centrifuge is communicated with a calcining furnace.
When the waste acid treatment device is actually used, the waste acid is introduced into the multi-effect evaporator, and the multi-effect evaporator heats the waste acid to evaporate most hydrogen chloride gas in the waste acid to obtain a ferrous chloride aqueous solution with higher concentration; because the multi-effect evaporator is communicated with the cooling crystallizer and the first condenser, the evaporated hydrogen chloride gas is introduced into the first condenser, and the evaporated hydrogen chloride gas contains a large amount of moisture, so that the hydrogen chloride gas is condensed in the first condenser and then liquefied into a hydrochloric acid solution, and the hydrochloric acid solution is recovered.
Because the temperature of the ferrous chloride aqueous solution is higher after heating, the content of ferrous chloride dissolved in water is high. And (3) introducing the ferrous chloride aqueous solution into a cooling crystallizer for cooling, and separating out ferrous chloride to obtain ferrous chloride tetrahydrate crystals after the temperature of the ferrous chloride aqueous solution is reduced.
And (3) introducing the aqueous solution separated out of the ferrous chloride tetrahydrate crystal into a centrifugal machine for centrifugation to obtain ferrous chloride tetrahydrate solid and liquid containing a small amount of hydrogen chloride. And (3) introducing the ferrous chloride tetrahydrate solid into a calcining furnace for calcining to obtain ferric oxide powder and hydrogen chloride gas, and thus recovering the ferric oxide powder.
In the whole process, the temperature of the multi-effect evaporator and the calcining furnace is lower, and the calcining furnace calcines the ferrous chloride tetrahydrate solid, so that compared with directly drying the waste acid aqueous solution, the time is short, the consumed energy consumption is lower, and the environment is protected.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic view of a connection structure of each component according to an embodiment of the present invention.
Icon: 1-a multi-effect evaporator; 2-cooling the crystallizer; 3-a centrifuge; 4-a screw conveyor; 5-calcining furnace; 6-a venturi mixer; 7-a circulating pump; 8-a gas-liquid separator; 9-a first condenser; 10-a second condenser; 11-a water absorption column; 12-alkaline washing tower.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be further noted that unless explicitly stated or limited otherwise, the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Examples
Referring to fig. 1, the present embodiment provides a waste acid recycling device, including a multiple-effect evaporator 1, where the multiple-effect evaporator 1 is communicated with a cooling crystallizer 2 and a first condenser 9; the cooling crystallizer 2 is communicated with a centrifuge 3, and the centrifuge 3 is communicated with a calciner 5.
When the waste acid treatment device is actually used, the waste acid is introduced into the multi-effect evaporator 1, and the multi-effect evaporator 1 heats the waste acid to evaporate most hydrogen chloride gas in the waste acid to obtain a ferrous chloride aqueous solution with higher concentration; because the multi-effect evaporator 1 is connected with the cooling crystallizer 2 and the first condenser 9, the evaporated hydrogen chloride gas is introduced into the first condenser 9, and the evaporated hydrogen chloride gas contains a large amount of moisture, and is liquefied into a hydrochloric acid solution after entering the first condenser 9 for condensation, so that the hydrochloric acid solution is recovered.
Because the temperature of the ferrous chloride aqueous solution is higher after heating, the content of ferrous chloride dissolved in water is high. And (3) introducing the ferrous chloride aqueous solution into a cooling crystallizer 2 for cooling, and separating out ferrous chloride to obtain ferrous chloride tetrahydrate crystals after the temperature of the ferrous chloride aqueous solution is reduced.
And (3) introducing the water solution separated out of the ferrous chloride tetrahydrate crystal into a centrifugal machine 3 for centrifugation to obtain ferrous chloride tetrahydrate solid and liquid containing a small amount of hydrogen chloride. And (3) introducing the ferrous chloride tetrahydrate solid into a calcining furnace 5 for calcining to obtain ferric oxide powder and hydrogen chloride gas, and recovering the ferric oxide powder.
In the whole process, the temperatures used by the multi-effect evaporator 1 and the calcining furnace 5 are lower, and the calcining furnace 5 calcines the ferrous chloride tetrahydrate solid, so that compared with directly drying the waste acid aqueous solution, the time is short, the consumed energy consumption is lower, and the environment is protected.
The multi-effect evaporation is a series evaporation operation taking secondary steam of a previous effect as heating steam of a next effect. In multi-effect evaporation, the operating pressure, corresponding heating steam temperature and solution boiling point of each effect are sequentially reduced. Heating steam is added into the first effect in the multi-effect evaporation, secondary steam generated from the first effect is used as the heating steam of the second effect, a heating chamber of the second effect is equivalent to a condenser of the first effect, the secondary steam generated from the second effect is used as the heating steam of the third effect, and the multi-effect evaporation is formed by connecting a plurality of evaporators in series. Alternatively, the multi-effect evaporator 1 of the present embodiment employs a multi-effect evaporator 1 commonly used in the industry.
A cooling crystallizer is a device that relies on reducing the temperature of the material to produce supersaturation of the material, which ultimately promotes crystallization of the material. Alternatively, the cooling crystallizer 2 of the present embodiment employs a cooling crystallizer 2 commonly used in the existing industry. Alternatively, the first condenser 9 and the centrifuge 3 of the present embodiment employ existing equipment commonly used in the industry.
As shown in fig. 1, in some embodiments of the present invention, a screw conveyor 4 is disposed between the centrifuge 3 and the calciner 5, and the screw conveyor 4 is respectively communicated with the centrifuge 3 and the calciner 5.
The utility model discloses a set up screw conveyer 4, above-mentioned screw conveyer 4 respectively with above-mentioned centrifuge 3 with the above-mentioned forge burning furnace 5 intercommunication, so be convenient for carry the ferrous chloride solid of tetrahydrate to get into through screw conveyer 4 and calcine in the burning furnace 5.
As shown in fig. 1, in some embodiments of the present invention, the centrifuge 3 is connected to a circulation pump 7, the circulation pump 7 is connected to a venturi mixer 6, the venturi mixer 6 is connected to the multi-effect evaporator 1, and the calcining furnace 5 is connected to the venturi mixer 6.
The venturi mixer is a special device for mixing gas and water efficiently. Because centrifuge 3 obtains the liquid that contains a small amount of hydrogen chloride after the centrifugation, the utility model discloses a set up circulating pump 7, above-mentioned circulating pump 7 intercommunication has venturi mixer 6, and above-mentioned venturi mixer 6 communicates with above-mentioned multiple effect evaporator 1, so be convenient for obtain the liquid that contains a small amount of hydrogen chloride after centrifuge 3 centrifugation and go into venturi mixer 6 through circulating pump 7 together with the waste liquid raw materials.
Because the calcining furnace 5 is communicated with the Venturi mixer 6, high-temperature gas generated during calcining of the calcining furnace 5 is introduced into the Venturi mixer 6 to heat liquid containing a small amount of hydrogen chloride and waste liquid raw materials, so that the temperature is recycled, the temperature of the liquid entering the multi-effect evaporator 1 is increased, and the consumption of the multi-effect evaporator 1 is lower.
As shown in fig. 1, in some embodiments of the present invention, a gas-liquid separator 8 is disposed between the venturi mixer 6 and the multi-effect evaporator 1, and the gas-liquid separator 8 is respectively communicated with the venturi mixer 6 and the multi-effect evaporator 1.
The utility model discloses a set up vapour and liquid separator 8, above-mentioned vapour and liquid separator 8 communicates with above-mentioned venturi mixer 6 and above-mentioned multi-effect evaporator 1 respectively, so forge the high temperature gas that produces when burning furnace 5 calcines and let in venturi mixer 6 in, heat the liquid and the waste liquid raw materials that contain a small amount of hydrogen chloride, liquid after the heating is advanced to go into vapour and liquid separator 8, so the hydrogen chloride gas that produces after the liquid heating can separate through vapour and liquid separator 8, the recovery of the hydrogen chloride gas of being convenient for. Alternatively, the gas-liquid separator 8 of the present embodiment employs a gas-liquid separator 8 commonly used in the existing industry.
As shown in fig. 1, in some embodiments of the present invention, the gas-liquid separator 8 is further communicated with a second condenser 10.
Because the hydrogen chloride gas after the evaporation contains a large amount of moisture, the utility model discloses a vapour and liquid separator 8 still communicates there is second condenser 10, consequently gets into in the second condenser 10 after the condensation, and the salified acid solution that liquefies so retrieves hydrochloric acid solution. Alternatively, the second condenser 10 of the present embodiment is a condenser commonly used in the industry.
As shown in fig. 1, in some embodiments of the present invention, the second condenser 10 further includes a water absorption tower 11, and the water absorption tower 11 is communicated with the second condenser.
Because hydrogen chloride gas can not be cooled into hydrochloric acid solution by second condenser 10 completely, the utility model discloses a set up water absorption tower 11, above-mentioned second condenser 10 and the 11 intercommunications of above-mentioned water absorption tower, so spray the absorption to the gas that flows out from second condenser 10, the lower hydrochloric acid solution of concentration is obtained to the hydrogen chloride among the absorption gas. Optionally, the water absorption tower 11 of the present embodiment is provided with a shower head for spraying water for absorbing hydrogen chloride in the gas.
As shown in fig. 1, in some embodiments of the present invention, the water absorption tower 11 is connected to a caustic washing tower 12.
The utility model discloses a water absorption tower 11 intercommunication has alkaline washing tower 12, and gas after so through water absorption tower 11 lets in alkaline washing tower 12, and alkaline washing tower 12 can spray alkaline liquid and carry out the neutralization to remaining hydrogen chloride in the gas, so further improves gaseous hydrogen chloride content, makes in order to discharge the air after the gas can reach the standard of discharging. Optionally, the caustic tower 12 of this embodiment is provided with a spray header to facilitate spraying of an aqueous alkaline solution to neutralize the hydrogen chloride remaining in the gas.
As shown in fig. 1, in some embodiments of the present invention, the above-mentioned further includes a water absorption tower 11, and the above-mentioned first condenser 9 is communicated with the above-mentioned water absorption tower 11.
Because hydrogen chloride gas can not be cooled into hydrochloric acid solution by first condenser 9 completely, the utility model discloses a set up water absorption tower 11, above-mentioned first condenser 9 and the 11 intercommunications of above-mentioned water absorption tower, so spray the absorption to the gas that flows out from first condenser 9, the lower hydrochloric acid solution of concentration is obtained to the hydrogen chloride among the absorption gas. Optionally, the water absorption tower 11 of the present embodiment is provided with a shower head for spraying water for absorbing hydrogen chloride in the gas.
As shown in fig. 1, in some embodiments of the present invention, the water absorption tower 11 is connected to a caustic washing tower 12.
The utility model discloses a water absorption tower 11 intercommunication has alkaline washing tower 12, and gas after so through water absorption tower 11 lets in alkaline washing tower 12, and alkaline washing tower 12 can spray alkaline liquid and carry out the neutralization to remaining hydrogen chloride in the gas, so further improves gaseous hydrogen chloride content, makes in order to discharge the air after the gas can reach the standard of discharging. Optionally, the caustic tower 12 of this embodiment is provided with a spray header to facilitate spraying of an aqueous alkaline solution to neutralize the hydrogen chloride remaining in the gas.
As shown in fig. 1, in some embodiments of the present invention, the calciner 5 is a reverberatory furnace.
Reverberatory furnaces are also known as flame reverberatory furnaces. A metallurgical furnace for melting metal by direct flame heating of a charge. The reverberatory furnace has simple structure, small investment and wide fuel variety (such as coal, coal gas, heavy oil and the like), and is commonly used as roasting equipment in the fields of metallurgy, chemical industry and the like. The utility model discloses a set up and forge burning furnace 5 and adopt the reverberatory furnace, be convenient for calcine.
It should be noted that the use of the reverberatory furnace as the calciner 5 is only one preferred embodiment of the present embodiment, and the present invention is not limited to this, and in other embodiments, a tempering furnace or the like may be used as the calciner 5.
To sum up, the embodiment of the utility model provides a waste acid recovery device, including multi-effect evaporator 1, above-mentioned multi-effect evaporator 1 communicates cooling crystallizer 2 and first condenser 9; the cooling crystallizer 2 is communicated with a centrifuge 3, and the centrifuge 3 is communicated with a calciner 5.
When the waste acid treatment device is actually used, the waste acid is introduced into the multi-effect evaporator 1, and the multi-effect evaporator 1 heats the waste acid to evaporate most hydrogen chloride gas in the waste acid to obtain a ferrous chloride aqueous solution with higher concentration; because multi-effect evaporator 1 intercommunication has cooling crystallizer 2 and first condenser 9, the hydrogen chloride gas after the evaporation lets in first condenser 9, because the hydrogen chloride gas after the evaporation contains a large amount of moisture, consequently get into first condenser 9 and condense the back, liquefy into hydrochloric acid solution, retrieve hydrochloric acid solution like this.
Because the temperature of the ferrous chloride aqueous solution is higher after heating, the content of ferrous chloride dissolved in water is high. And (3) introducing the ferrous chloride aqueous solution into a cooling crystallizer 2 for cooling, and separating out ferrous chloride to obtain ferrous chloride tetrahydrate crystals after the temperature of the ferrous chloride aqueous solution is reduced.
And (3) introducing the water solution separated out of the ferrous chloride tetrahydrate crystal into a centrifugal machine 3 for centrifugation to obtain ferrous chloride tetrahydrate solid and liquid containing a small amount of hydrogen chloride. And (3) introducing the ferrous chloride tetrahydrate solid into a calcining furnace 5 for calcining to obtain ferric oxide powder and hydrogen chloride gas, and recovering the ferric oxide powder.
In the whole process, the temperatures used by the multi-effect evaporator 1 and the calcining furnace 5 are lower, and the calcining furnace 5 calcines the ferrous chloride tetrahydrate solid, so that compared with directly drying the waste acid aqueous solution, the time is short, the consumed energy consumption is lower, and the environment is protected.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a spent acid recovery unit which characterized in that: the system comprises a multi-effect evaporator, wherein the multi-effect evaporator is communicated with a cooling crystallizer and a first condenser; the cooling crystallizer is communicated with a centrifuge, and the centrifuge is communicated with a calcining furnace.
2. A spent acid recovery device as claimed in claim 1, wherein: and a screw conveyor is arranged between the centrifugal machine and the calcining furnace, and the screw conveyor is respectively communicated with the centrifugal machine and the calcining furnace.
3. A spent acid recovery device as claimed in claim 1, wherein: the centrifugal machine is communicated with a circulating pump, the circulating pump is communicated with a Venturi mixer, the Venturi mixer is communicated with the multi-effect evaporator, and the calcining furnace is communicated with the Venturi mixer.
4. A spent acid recovery device as claimed in claim 3, wherein: the venturi mixer with be equipped with vapour and liquid separator between the multi-effect evaporimeter, vapour and liquid separator respectively with the venturi mixer with the multi-effect evaporimeter intercommunication.
5. A spent acid recovery device as claimed in claim 4, wherein: the gas-liquid separator is also communicated with a second condenser.
6. A spent acid recovery device as claimed in claim 5, wherein: still include water absorption tower, the second condenser with water absorption tower intercommunication.
7. A spent acid recovery device as claimed in claim 6, wherein: the water absorption tower is communicated with an alkaline washing tower.
8. A spent acid recovery device as claimed in claim 1, wherein: still include water absorption tower, first condenser with water absorption tower intercommunication.
9. A spent acid recovery device as claimed in claim 8, wherein: the water absorption tower is communicated with an alkaline washing tower.
10. A spent acid recovery device as claimed in claim 1, wherein: the calcining furnace adopts a reverberatory furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120287901.9U CN214570734U (en) | 2021-02-01 | 2021-02-01 | Waste acid recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120287901.9U CN214570734U (en) | 2021-02-01 | 2021-02-01 | Waste acid recovery device |
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| Publication Number | Publication Date |
|---|---|
| CN214570734U true CN214570734U (en) | 2021-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120287901.9U Active CN214570734U (en) | 2021-02-01 | 2021-02-01 | Waste acid recovery device |
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| CN (1) | CN214570734U (en) |
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2021
- 2021-02-01 CN CN202120287901.9U patent/CN214570734U/en active Active
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