CN210313808U - Processing system of acid waste liquid - Google Patents
Processing system of acid waste liquid Download PDFInfo
- Publication number
- CN210313808U CN210313808U CN201920894183.4U CN201920894183U CN210313808U CN 210313808 U CN210313808 U CN 210313808U CN 201920894183 U CN201920894183 U CN 201920894183U CN 210313808 U CN210313808 U CN 210313808U
- Authority
- CN
- China
- Prior art keywords
- outlet
- communicated
- waste liquid
- liquid
- acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Removal Of Specific Substances (AREA)
Abstract
The utility model provides a processing system of acid waste liquid, include: the reaction device is provided with an acid waste liquid inlet, a ferric sulfate solution inlet, a calcium hydroxide inlet and an acid treatment slurry outlet; the feed inlet and the acid treatment slurry outlet are communicated with each other through an acid treatment slurry conveying pipeline, the upper part of the clarifying tank is provided with a clarifying solution overflow outlet, and the bottom of the clarifying tank is provided with a substrate outlet; a water collecting tank with a feed inlet communicated with a clear liquid overflow outlet; the feed inlet and the liquid outlet of the water collecting tank are communicated with each other through a liquid conveying pipeline, and the saliferous wastewater membrane treatment reactor is provided with a desalted water outlet and a sewage outlet; the acidic waste liquid filter press is provided with a filter cake outlet and a filtrate outlet, and the feed inlet is communicated with the substrate outlet through a substrate conveying pipeline; the acid waste filtrate collecting tank is provided with a self-flowing liquid outlet; the self-flowing liquid outlet is communicated with the feed inlet of the water collecting tank. The treatment system can effectively remove iron, magnesium, aluminum, silicon and heavy metals in the acidic waste liquid, and the treatment process is clean and environment-friendly.
Description
Technical Field
The utility model relates to a coal deep-processing technical field, more specifically say, relate to a processing system of acid waste liquid.
Background
Ultra Clean Coal (UCC) is Clean Coal with ash content not more than 1%, and is prepared by using Clean Coal as raw material through chemical cleaning, separation and filtration. UCC is an alternative energy source, and the largest market potential is to replace diesel oil and heavy oil on power generation, steamships, trucks and trains, so that coal resources are efficiently and cleanly utilized, and the requirements of energy and environmental protection are met. Since the last century developed countries such as australia, japan and the united kingdom have been involved in research and development of UCC technology. Currently, the UCC preparation technology includes physical and chemical methods, among which the chemical methods are mainly hydrofluoric acid, acid-base, melt-alkali leaching, chemical coal technology, and the like. Among the technologies that have been successfully developed abroad are the Australian Auscoal Process (now Yan coal Australian UCC technology), the American Gravimelt Process, and others. Internationally, the UCC technology is developed for a long time, but no examples of the commercial development of the technology exist, and the research and development result of the UCC technology in Australia of Yan coal is in the leading position.
The treatment of the acidic waste stream in the australian ausclean process is caustic regeneration by adding slaked lime to the acidic waste stream which reacts to form gypsum precipitate and caustic. However, it has been found through industrial application experiments that the reaction to form gypsum is still accompanied by a complicated chemical reaction. The Na-Ca-Al silicate formed by sodium, aluminum and silicon in the acidic waste liquid needs alkaline conditions, and the calcium sulfate precipitation needs acidic conditions; thus, both chemical reactions cannot be carried out under the same experimental conditions. And the pH value of the treated wastewater is too high to meet the discharge requirement.
In summary, the development of a system with good treatment effect on the acidic waste liquid in the process of preparing ultra-clean coal by chemical method and clean and environment-friendly treatment process to solve the difficulty of the traditional caustic regeneration method in treating the acidic waste liquid becomes a technical problem to be solved by those skilled in the art
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a system for treating an acidic waste liquid, which can effectively remove iron, magnesium, aluminum, silicon and related heavy metals, such as zinc, lead, cadmium, nickel and arsenic, from the acidic waste liquid, and the treatment process is clean and environment-friendly.
The utility model provides a processing system of acid waste liquid, include:
a reaction device; the reaction device is provided with an acid waste liquid inlet, a ferric sulfate solution inlet, a calcium hydroxide inlet and an acid treatment slurry outlet;
the feed inlet and the acid treatment slurry outlet are communicated with each other through an acid treatment slurry conveying pipeline; the upper part of the clarifying tank is provided with a clarifying solution overflow outlet, and the bottom of the clarifying tank is provided with a substrate outlet;
the feed inlet is communicated with the water collecting tank of the clarified liquid overflow outlet;
the feed inlet is communicated with a liquid outlet of the water collecting tank through a liquid conveying pipeline; the salt-containing wastewater membrane treatment reactor is provided with a desalted water outlet and a sewage outlet;
the feed inlet is communicated with the substrate outlet through a substrate conveying pipeline; the acidic waste liquid filter press is provided with a filter cake outlet and a filtrate outlet;
the feed inlet is communicated with the filtrate outlet and is communicated with the acid waste filtrate collecting tank; the acid waste filtrate collecting tank is provided with a self-flowing liquid outlet; the gravity flow liquid outlet is communicated with the feed inlet of the water collecting tank.
Preferably, the reaction device consists of three groups of reaction tanks connected in parallel, and each group of reaction tanks is provided with a stirring device, a return pipeline with a circulating pump and a steam heating device.
Preferably, the acid treatment slurry conveying pipeline, the liquid conveying pipeline and the substrate conveying pipeline are respectively provided with a conveying pump.
Preferably, the method further comprises the following steps:
a ferric sulfate solution preparation tank; the ferric sulfate solution preparation tank is provided with a stirring device, a ferric sulfate inlet, a water inlet and a discharge hole; the water inlet is communicated with the desalted water outlet through a desalted water conveying pipeline;
and the discharge hole of the ferric sulfate solution configuration groove is communicated with the ferric sulfate solution feed hole through a ferric sulfate solution feed pipeline.
Preferably, the desalted water conveying pipeline and the ferric sulfate solution feeding pipeline are respectively provided with a conveying pump.
The utility model provides a processing system of acid waste liquid, include: a reaction device; the reaction device is provided with an acid waste liquid inlet, a ferric sulfate solution inlet, a calcium hydroxide inlet and an acid treatment slurry outlet; the feed inlet and the acid treatment slurry outlet are communicated with each other through an acid treatment slurry conveying pipeline; the upper part of the clarifying tank is provided with a clarifying solution overflow outlet, and the bottom of the clarifying tank is provided with a substrate outlet; the feed inlet is communicated with the water collecting tank of the clarified liquid overflow outlet; the feed inlet is communicated with a liquid outlet of the water collecting tank through a liquid conveying pipeline; the salt-containing wastewater membrane treatment reactor is provided with a desalted water outlet and a sewage outlet; the feed inlet is communicated with the substrate outlet through a substrate conveying pipeline; the acidic waste liquid filter press is provided with a filter cake outlet and a filtrate outlet; the feed inlet is communicated with the filtrate outlet and is communicated with the acid waste filtrate collecting tank; the acid waste filtrate collecting tank is provided with a self-flowing liquid outlet; the gravity flow liquid outlet is communicated with the feed inlet of the water collecting tank. Compared with the prior art, the utility model provides a processing system can effectively get rid of iron, magnesium, aluminium, silicon and relevant heavy metal in the acid waste liquid, like zinc, lead, cadmium, nickel, arsenic, and the clean environmental protection of processing procedure. The experimental result shows that the treatment system provided by the utility model can remove most of iron, magnesium, aluminum and silicon in the acid waste liquid, and the removal rate is more than 99.5%; most of sodium ions are also removed by solidification and precipitation, and the removal rate reaches 81.63%; in addition, heavy metals such as zinc, lead, cadmium, nickel and arsenic in the acidic waste liquid are effectively removed, and the removal rates are respectively 100%, 61%, 67%, 90% and 92%.
Drawings
Fig. 1 is a schematic structural diagram of a system for treating an acidic waste liquid provided by an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a reaction apparatus in a treatment system for acidic waste liquid provided by an embodiment of the present invention, which is three groups of reaction tanks connected in parallel.
Detailed Description
The technical solution of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides a processing system of acid waste liquid, include:
a reaction device; the reaction device is provided with an acid waste liquid inlet, a ferric sulfate solution inlet, a calcium hydroxide inlet and an acid treatment slurry outlet;
the feed inlet and the acid treatment slurry outlet are communicated with each other through an acid treatment slurry conveying pipeline; the upper part of the clarifying tank is provided with a clarifying solution overflow outlet, and the bottom of the clarifying tank is provided with a substrate outlet;
the feed inlet is communicated with the water collecting tank of the clarified liquid overflow outlet;
the feed inlet is communicated with a liquid outlet of the water collecting tank through a liquid conveying pipeline; the salt-containing wastewater membrane treatment reactor is provided with a desalted water outlet and a sewage outlet;
the feed inlet is communicated with the substrate outlet through a substrate conveying pipeline; the acidic waste liquid filter press is provided with a filter cake outlet and a filtrate outlet;
the feed inlet is communicated with the filtrate outlet and is communicated with the acid waste filtrate collecting tank; the acid waste filtrate collecting tank is provided with a self-flowing liquid outlet; the gravity flow liquid outlet is communicated with the feed inlet of the water collecting tank.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a system for treating an acidic waste liquid according to an embodiment of the present invention; wherein, R511 is a reaction device, 511 is ferric sulfate solution, 513 is acid treatment slurry, V512 is a clarifying tank, V513 is a water collecting tank, 515 is liquid of the water collecting tank, M512 is a saline wastewater membrane treatment reactor, 519 is desalted water, 520 is sewage, M511 is an acidic waste liquid filter press, 514 is a filter cake, and V514 is an acid waste filtrate collecting tank.
The utility model discloses in, the processing system of acid waste liquid includes reaction unit (R511), clarification tank (V512), water catch bowl (V513), contains salt waste water membrane treatment reactor (M512), acid waste liquid pressure filter (M511) and acid waste filtrating collecting vat (V514).
In the utility model, the reaction device (R511) is used for carrying out the reaction of the acidic waste liquid, the ferric sulfate solution and the calcium hydroxide; the reaction process comprises the following steps:
(1) formation of astrakanite:
Na2SO4(aq)+3Fe2(SO4)3(aq)+6Ca(OH)2+12H2O＝2NaFe3(SO4)2(OH)6(s)+6CaSO4·2H2O(s)；
(2) neutralization of acid:
Al2(SO4)3(aq)+3Ca(OH)2(s)+6H2O＝2Al(OH)3(s)+3CaSO4·2H2O(s)；
H2SiO3(aq)+Ca(OH)2(s)＝CaSiO3(s)+2H2O(aq)；
Fe2(SO4)3(aq)+3Ca(OH)2(s)+6H2O＝2Fe(OH)3(s)+3CaSO4·2H2O(s)；
H2SO4(aq)+Ca(OH)2(s)＝CaSO4·2H2O(s)。
the utility model adopts the technical scheme that ferric sulfate solution and calcium hydroxide are added into acidic waste liquid to react to generate jarosite precipitate, heavy metals in the acidic waste liquid are synchronously fixed and precipitated in the formation process of the jarosite precipitate, the jarosite precipitate is very stable in the environment, is not dissolved in water, and heavy metal ions cannot be leached out; calcium hydroxide is further added for neutralization reaction, and silicon and other metal ions (such as iron, magnesium and aluminum) in the reaction mixture are fixed and precipitated, so that the aim of effectively removing iron, magnesium, aluminum, silicon and related heavy metals such as zinc, lead, cadmium, nickel and arsenic is fulfilled.
In the utility model, the reaction device (R511) is provided with an acid waste liquid inlet, a ferric sulfate solution inlet, a calcium hydroxide inlet and an acid treatment slurry outlet; wherein the acidic waste liquid inlet is connected with an acidic waste liquid feeding pipeline and used for conveying the acidic waste liquid into the reaction device (R511); the ferric sulfate solution inlet is connected with a ferric sulfate solution feeding pipeline and used for conveying a ferric sulfate solution into the reaction device (R511); the calcium hydroxide inlet is used for conveying calcium hydroxide into the reaction device (R511); the acid-treated slurry outlet is for discharging the reacted acid-treated slurry out of the reaction apparatus (R511).
In the utility model, the reaction device (R511) preferably comprises three groups of reaction tanks connected in parallel, and each group of reaction tank is provided with a stirring device, a return pipeline with a circulating pump and a steam heating device; wherein the stirring device is used for mixing the raw materials in the reaction tank; the return pipeline with the circulating pump is used for returning the reacted acid treatment slurry; the steam heating device supplies heat to the reaction tank through steam and outputs condensate.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a system for treating an acidic waste liquid, in which reaction devices are three groups of reaction tanks connected in parallel according to an embodiment of the present invention; wherein, R511A, R511B and R511C are three groups of parallel reaction tanks, P512A is a circulating pump of the reaction tank (R511A), P512B is a circulating pump of the reaction tank (R511B), P512C is a circulating pump of the reaction tank (R511C), 511 represents an iron sulfate solution, and 513 represents an acid-treated slurry.
In the utility model, the clarifying tank (V512) is used for settling the obtained acid treatment slurry. In the utility model, the top of the clarifying tank (V512) is provided with a feed inlet which is communicated with the acid treatment slurry outlet through an acid treatment slurry conveying pipeline; the acid treatment slurry delivery line is preferably provided with a delivery pump (P513) for delivering the acid treatment slurry to a clarifier (V512).
In the utility model, the upper part of the clarifying tank (V512) is provided with a clarifying liquid overflow outlet, and the bottom is provided with a substrate outlet.
The utility model discloses in, water catch bowl (V513) are used for collecting the pending liquid based on the environmental protection requirement. In the utility model, the water collecting tank (V513) is provided with a feed inlet and a liquid outlet; wherein, the feed inlet of the water collecting tank (V513) is communicated with the supernatant liquid overflow outlet, and the supernatant liquid enters the water collecting tank (V513) under the action of gravity; the liquid outlet is used for discharging clear liquid collected by the water collecting tank (V513).
The utility model discloses in, contain salt waste water membrane treatment reactor (M512) and be used for carrying out the membrane treatment reaction to the clarified liquid after collecting. In the utility model, the salt-containing wastewater membrane treatment reactor (M512) is provided with a feed inlet which is communicated with a liquid outlet of the water collecting tank (V513) through a liquid conveying pipeline; the liquid conveying pipeline is preferably provided with a conveying pump (P515) for conveying the collected clarified liquid to a salt-containing wastewater membrane treatment reactor (M512).
In the utility model, the salt-containing wastewater membrane treatment reactor (M512) is provided with a desalted water outlet and a sewage outlet. The utility model discloses in, the demineralized water export links to each other with demineralized water conveying line for discharge demineralized water (519), in the preferred embodiment of the utility model, discharged demineralized water divide into two the tunnel, is used for preparing ferric sulfate solution all the way (517), and another way (516) are used for obtaining acidic waste liquid (as the washing moisturizing). In the utility model discloses in, the demineralized water transfer line preferably is equipped with delivery pump (P517) for carry the demineralized water.
The utility model discloses in, the sewage export links to each other with sewage conveying line for discharge sewage (520), further treatment again. In the present invention, the sewage transfer line is preferably provided with a transfer pump (P518) for transferring sewage.
In the utility model, the acid waste liquor filter press (M511) is used for carrying out filter pressing on the obtained substrate. In the utility model, the acid waste liquor filter press (M511) is provided with a feed inlet which is communicated with the substrate outlet through a substrate conveying pipeline; the substrate transport line is preferably provided with a transport pump (P514).
In the utility model, the acid waste liquid filter press (M511) is provided with a filter cake outlet and a filtrate outlet.
In the utility model discloses, useless filtrating collecting vat of sour (V514) is used for collecting the filtrating. In the utility model, the acid waste filtrate collecting tank (V514) is provided with a feed inlet and a free-flowing liquid outlet; wherein the feed inlet of the acid waste filtrate collecting tank (V514) is communicated with the filtrate outlet; the self-flowing liquid outlet is communicated with the feed inlet of the water collecting tank (V513), and the filtrate collected in the acid waste filtrate collecting tank (V514) is discharged through the self-flowing liquid outlet and enters the water collecting tank (V513) under the action of gravity.
In the present invention, the treatment system for acidic waste liquid preferably further comprises:
a ferric sulfate solution preparation tank (V511); used for preparing ferric sulfate solution. In the utility model, the ferric sulfate solution preparation tank (V511) is preferably provided with a stirring device, a ferric sulfate inlet, a water inlet and a discharge hole; wherein the stirring device is used for mixing the raw materials in the ferric sulfate solution preparation tank (V511); the water inlet is communicated with the desalted water outlet through a desalted water conveying pipeline; the desalted water conveying pipeline is preferably provided with a conveying pump (P517) for conveying desalted water; the discharge hole of the ferric sulfate solution configuration groove (V511) is communicated with the ferric sulfate solution feed hole through a ferric sulfate solution feed pipeline; the iron sulfate solution feed line is preferably provided with a delivery pump (P511) for delivering the iron sulfate solution (511).
The utility model provides a processing system can effectively get rid of iron, magnesium, aluminium, silicon and relevant heavy metal in the acid waste liquid, like zinc, plumbum, cadmium, nickel, arsenic, and the clean environmental protection of processing procedure.
The utility model also provides a processing method of acid waste liquid, adopt above-mentioned technical scheme processing system, including following step:
a) mixing the acidic waste liquid with a ferric sulfate solution and calcium hydroxide, and reacting to obtain a reaction mixture; adding calcium hydroxide for neutralization reaction to obtain acid treated slurry;
b) settling the acid treatment slurry obtained in the step a) to respectively obtain a clarified liquid and a substrate; wherein, after the clear liquid is collected, membrane treatment reaction is carried out to respectively obtain desalted water and sewage; carrying out filter pressing on the substrate to respectively obtain a filter cake and a filtrate;
c) collecting the filtrate obtained in the step b), and then carrying out the membrane treatment reaction in the step b).
The utility model firstly mixes the acid waste liquid with ferric sulfate solution and calcium hydroxide for reaction to obtain a reaction mixture; then adding calcium hydroxide for neutralization reaction to obtain acid treatment slurry. In the utility model, the acidic waste liquid is preferably acidic filtrate from an acid washing unit in the process of preparing the ultra-clean coal by a chemical method, wherein the acidic waste liquid mainly contains iron, magnesium, aluminum, silicon, calcium, sodium and heavy metals; the heavy metals mainly comprise zinc (Zn), lead (Pb), cadmium (Cd), nickel (Ni) and arsenic (As) and exist in the form of ions.
In the present invention, the mass fraction of the ferric sulfate solution is preferably 12% to 20%, and more preferably 16%.
The utility model discloses in, react after mixing acid waste liquid and ferric sulfate solution, calcium hydroxide and specifically go on according to the formation process of following yellow sodium iron vitriol:
Na2SO4(aq)+3Fe2(SO4)3(aq)+6Ca(OH)2+12H2O＝2NaFe3(SO4)2(OH)6(s)+6CaSO4·2H2O(s)；
and adding the ferric sulfate solution into the acidic waste liquid according to the amount which is 1-1.25 times of the reaction amount.
In the utility model, the pH value of the reaction is preferably 1.8-2.5, and more preferably 2; adjusting by controlling the addition amount of calcium hydroxide; the reaction temperature is preferably 50-80 ℃, and more preferably 60-80 ℃; the reaction time is preferably 4 to 15 hours, more preferably 8 to 12 hours.
After the reaction mixture is obtained, calcium hydroxide is added for neutralization reaction to obtain acid treatment slurry; the method specifically comprises the following acid neutralization process:
Al2(SO4)3(aq)+3Ca(OH)2(s)+6H2O＝2Al(OH)3(s)+3CaSO4·2H2O(s)；
H2SiO3(aq)+Ca(OH)2(s)＝CaSiO3(s)+2H2O(aq)；
Fe2(SO4)3(aq)+3Ca(OH)2(s)+6H2O＝2Fe(OH)3(s)+3CaSO4·2H2O(s)；
H2SO4(aq)+Ca(OH)2(s)＝CaSO4·2H2O(s)。
in the present invention, the process of the neutralization reaction is preferably specifically:
under the condition of stirring, adding calcium hydroxide until the pH value is 7, and continuously reacting for 4-6 h to obtain acid treatment slurry.
The utility model discloses an add appropriate amount ferric sulfate and calcium hydroxide in the acid waste liquid, generate jarosite class precipitate under certain reaction condition, in the formation process of jarosite class precipitate, heavy metal (such as zinc, lead, cadmium, nickel, arsenic) in the acid waste liquid obtains fixing and deposit in step, jarosite class precipitate is very stable in the environment, both is not dissolved in water, wherein heavy metal ion also can not leach; and further adding a proper amount of calcium hydroxide, regulating the pH value, performing neutralization reaction, and fixing and precipitating silicon and other metal ions (such as iron, magnesium and aluminum) in the reaction mixture so as to achieve the aim of effectively removing iron, magnesium, aluminum, silicon and related heavy metals such as zinc, lead, cadmium, nickel and arsenic.
Obtain behind the acid treatment thick liquid, the utility model discloses the acid treatment thick liquid that will obtain carries out settlement treatment, obtains clarified liquid and substrate respectively. In the utility model, the settling treatment adopts a clarification tank. In the utility model, the acid treatment slurry is flocculent, and a flocculating agent is preferably added in order to improve the sedimentation rate.
In the utility model, after the clarified liquid is collected, membrane treatment reaction is carried out to obtain desalted water and sewage (high salinity wastewater) respectively. The utility model discloses in, collect and adopt the water catch bowl. In the utility model, the membrane treatment reaction adopts a saline wastewater membrane treatment reactor; the water recovery rate of the membrane treatment reaction is preferably 70% to 80%, more preferably 75%.
The utility model discloses it is preferred still to include:
respectively using the obtained desalted water for preparing a ferric sulfate solution and obtaining an acid waste liquid; wherein the obtained acidic waste liquid is mainly water washing and water supplementing of an acid washing unit in the process of preparing the ultra-clean coal by using the desalted water through a chemical method.
The utility model discloses it is preferred still to include:
and the obtained sewage is subjected to sewage treatment, so that the harmlessness of the sewage is realized, and the environment-friendly discharge is achieved.
The utility model discloses in, the substrate carries out the filter-pressing, obtains filter cake and filtrating respectively. In the present invention, the substrate is solid and water. The utility model discloses in, the filter-pressing adopts acid waste liquid pressure filter. In the utility model discloses in, the filter cake is mainly gypsum and sodium iron vanadium precipitate, the utility model discloses preferred further innoxious landfill treatment or comprehensive utilization.
The utility model provides a processing method compares traditional caustic alkali regeneration method, can effectively get rid of iron, magnesium, aluminium, silicon and relevant heavy metal in the acid waste liquid, like zinc, lead, cadmium, nickel, arsenic, and the clean environmental protection of processing procedure. And simultaneously, the utility model provides a processing method simple process, easy operation, energy consumption are low, and relevant equipment and auxiliary agent are easily obtained, change machine and material cost low, have feature of environmental protection and economic nature concurrently, are favorable to promoting and developing in this field.
The utility model provides a processing system of acid waste liquid, include: a reaction device; the reaction device is provided with an acid waste liquid inlet, a ferric sulfate solution inlet, a calcium hydroxide inlet and an acid treatment slurry outlet; the feed inlet and the acid treatment slurry outlet are communicated with each other through an acid treatment slurry conveying pipeline; the upper part of the clarifying tank is provided with a clarifying solution overflow outlet, and the bottom of the clarifying tank is provided with a substrate outlet; the feed inlet is communicated with the water collecting tank of the clarified liquid overflow outlet; the feed inlet is communicated with a liquid outlet of the water collecting tank through a liquid conveying pipeline; the salt-containing wastewater membrane treatment reactor is provided with a desalted water outlet and a sewage outlet; the feed inlet is communicated with the substrate outlet through a substrate conveying pipeline; the acidic waste liquid filter press is provided with a filter cake outlet and a filtrate outlet; the feed inlet is communicated with the filtrate outlet and is communicated with the acid waste filtrate collecting tank; the acid waste filtrate collecting tank is provided with a self-flowing liquid outlet; the gravity flow liquid outlet is communicated with the feed inlet of the water collecting tank. Compared with the prior art, the utility model provides a processing system can effectively get rid of iron, magnesium, aluminium, silicon and relevant heavy metal in the acid waste liquid, like zinc, lead, cadmium, nickel, arsenic, and the clean environmental protection of processing procedure. The experimental result shows that the treatment method provided by the utility model can remove most of iron, magnesium, aluminum and silicon in the acid waste liquid, and the removal rate is more than 99.5%; most of sodium ions are also removed by solidification and precipitation, and the removal rate reaches 81.63%; in addition, heavy metals such as zinc, lead, cadmium, nickel and arsenic in the acidic waste liquid are effectively removed, and the removal rates are respectively 100%, 61%, 67%, 90% and 92%.
And simultaneously, the utility model provides a processing method simple process, easy operation, energy consumption are low, and relevant equipment and auxiliary agent are easily obtained, change machine and material cost low, have feature of environmental protection and economic nature concurrently, are favorable to promoting and developing in this field.
To further illustrate the present invention, the following examples are given in detail. The acid waste liquid used in the following examples of the present invention is the acid filtrate from the acid washing unit in the chemical method for preparing ultra-clean coal, and the specific ion content data is shown in table 1.
TABLE 1 ion content data of acidic waste liquids used in the examples of the present invention
| Metal ions in acid liquor | Al | Si | Fe | Ca | Mg | Na |
| Untreated acid solution/ppm | 2066.15 | 2357.94 | 418.17 | 624.83 | 90.84 | 11893.45 |
| Heavy metal ions in acid liquor | Zn | Pb | Cd | Ni | As | - |
| Untreated acid solution/ppm | 15.80 | 23.67 | 0.37 | 5.40 | 65.52 | - |
Example 1
A schematic structural diagram of the system for treating an acidic waste liquid provided in example 1 is shown in fig. 1, wherein the reaction devices are three groups of reaction tanks connected in parallel, and specifically shown in fig. 2; wherein, V511 is a ferric sulfate solution preparation tank, 511 represents a ferric sulfate solution, P511 is a transfer pump, R511 is a reaction device (wherein, R511A, R511B, and R511C are three groups of reaction tanks connected in parallel), P512 is a circulating pump (wherein, P512A is a circulating pump of the reaction tank (R511A), P512B is a circulating pump of the reaction tank (R511B), P512C is a circulating pump of the reaction tank (R511C)), P513 is a transfer pump, 513 represents an acid treatment slurry, V512 is a clarification tank, V513 is a water collection tank, 515 represents a liquid of the water collection tank, P515 is a transfer pump, M512 is a salt-containing wastewater membrane treatment reactor, 519 represents desalted water (including 517 and 516), 520 represents sewage, P514 is a transfer pump, M511 is an acidic waste liquid waste filter press, 514 represents a filter cake, V515 is a filter cake collection tank, and V514 is an acid waste filtrate collection tank.
The treatment system is used for treating the acidic waste liquid, and the specific working process is as follows:
(1) conveying the acidic waste liquid, 16 mass percent of ferric sulfate solution (511) and calcium hydroxide into a reaction device (R511), mixing the acidic waste liquid and the calcium hydroxide under stirring (the ferric sulfate solution is added into the acidic waste liquid according to 1.05 times of the reaction amount, and each 1kg of the acidic waste liquid corresponds to 1.682kg of the ferric sulfate solution), controlling the pH value to be 2, and reacting for 12 hours at 80 ℃ to obtain a reaction mixture; calcium hydroxide was further added and mixed under stirring to control the pH at 7, and neutralization reaction was carried out for 6 hours to obtain an acid-treated slurry (513) (a gypsum-based mixture).
(2) Sending the acid treatment slurry (513) obtained in the step (1) into a clarifying tank (V512) through a delivery pump (P513), and performing sedimentation treatment for 1h under the action of a flocculating agent (polyacrylamide (PAM) with the dosage of 0.5ppm) to respectively obtain a clarified liquid and a substrate; the clear liquid overflows from the upper part of a clarifying tank (V512), enters a water collecting tank (V513) under the action of gravity and is collected to obtain liquid (515) of the water collecting tank, and is sent to a salt-containing wastewater membrane treatment reactor (M512) through a delivery pump (P515) for membrane treatment reaction to respectively obtain desalted water (519) and sewage (520); wherein one path (517) of the desalted water is used for preparing a ferric sulfate solution, and the other path (516) of the desalted water is used for obtaining an acidic waste liquid (used as water for washing and supplementing); the sewage (520) is sent to sewage treatment by a delivery pump (P518);
the substrate is conveyed to an acid waste liquor filter press (M511) through a conveying pump (P514) for filter pressing to respectively obtain a filter cake (514) and filtrate; wherein the filter cake (514) is collected by a filter cake collecting tank (V515) and then sent to a professional company for harmless treatment.
(3) And (3) collecting the filtrate obtained in the step (2) by using an acid waste filtrate collecting tank (V514), automatically flowing to a water collecting tank (V513) for further collection to obtain liquid (515) of the water collecting tank, and carrying out the membrane treatment reaction in the step (2).
Detecting the ion content of the clarified liquid obtained in the step (2) by using a plasma emission spectrometer, wherein the result is shown in a table 2; the clarified solution also contains a large amount of Na+、Ca2+And sulfate ions, and can be continuously sent to a salt-containing wastewater membrane treatment reactor (M512) for membrane treatment reaction (desalination treatment).
TABLE 2 ion content data of acid waste liquid after treatment in example 1 of the present invention
| Metal ions in acid liquor | Al | Si | Fe | Ca | Mg | Na |
| Acid solution/ppm after treatment | 0.33 | 2.02 | 0.00 | 420.16 | 0.31 | 2185.12 |
| Heavy metal ions in acid liquor | Zn | Pb | Cd | Ni | As | - |
| Acid solution/ppm after treatment | 0.00 | 14.48 | 0.12 | 0.54 | 5.24 | - |
Through calculation, the treatment method provided by the embodiment 1 of the utility model can remove most of iron, magnesium, aluminum and silicon in the acidic waste liquid, and the removal rate is more than 99.5%, wherein the removal rate of iron is 100.00%, the removal rate of magnesium is 99.66%, the removal rate of aluminum is 99.98%, and the removal rate of silicon is 99.91%; most of sodium ions are also removed by solidification and precipitation, and the removal rate reaches 81.63%; in addition, the removal rate of calcium was 32.76%; in addition, heavy metals such as zinc, lead, cadmium, nickel and arsenic in the acidic waste liquid are effectively removed, and the removal rates are respectively 100%, 61%, 67%, 90% and 92%.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A system for treating an acidic waste liquid, comprising:
a reaction device; the reaction device is provided with an acid waste liquid inlet, a ferric sulfate solution inlet, a calcium hydroxide inlet and an acid treatment slurry outlet;
the feed inlet and the acid treatment slurry outlet are communicated with each other through an acid treatment slurry conveying pipeline; the upper part of the clarifying tank is provided with a clarifying solution overflow outlet, and the bottom of the clarifying tank is provided with a substrate outlet;
the feed inlet is communicated with the water collecting tank of the clarified liquid overflow outlet;
the feed inlet is communicated with a liquid outlet of the water collecting tank through a liquid conveying pipeline; the salt-containing wastewater membrane treatment reactor is provided with a desalted water outlet and a sewage outlet;
the feed inlet is communicated with the substrate outlet through a substrate conveying pipeline; the acidic waste liquid filter press is provided with a filter cake outlet and a filtrate outlet;
the feed inlet is communicated with the filtrate outlet and is communicated with the acid waste filtrate collecting tank; the acid waste filtrate collecting tank is provided with a self-flowing liquid outlet; the gravity flow liquid outlet is communicated with the feed inlet of the water collecting tank.
2. The system for treating acidic waste liquid according to claim 1, wherein the reaction apparatus comprises three groups of reaction tanks connected in parallel, each group of reaction tanks being provided with a stirring apparatus, a return line with a circulation pump, and a steam heating apparatus.
3. The system for treating acidic waste liquid according to claim 1, wherein the acid treatment slurry transport line, the liquid transport line and the substrate transport line are each provided with a transport pump.
4. The system for treating an acidic waste liquid according to claim 1, further comprising:
a ferric sulfate solution preparation tank; the ferric sulfate solution preparation tank is provided with a stirring device, a ferric sulfate inlet, a water inlet and a discharge hole; the water inlet is communicated with the desalted water outlet through a desalted water conveying pipeline;
and the discharge hole of the ferric sulfate solution configuration groove is communicated with the ferric sulfate solution feed hole through a ferric sulfate solution feed pipeline.
5. The system for treating acidic waste liquid according to claim 4, wherein the desalted water supply line and the ferric sulfate solution feed line are respectively provided with a supply pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920894183.4U CN210313808U (en) | 2019-06-13 | 2019-06-13 | Processing system of acid waste liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920894183.4U CN210313808U (en) | 2019-06-13 | 2019-06-13 | Processing system of acid waste liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210313808U true CN210313808U (en) | 2020-04-14 |
Family
ID=70143769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920894183.4U Active CN210313808U (en) | 2019-06-13 | 2019-06-13 | Processing system of acid waste liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210313808U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110127907A (en) * | 2019-06-13 | 2019-08-16 | 兖矿水煤浆气化及煤化工国家工程研究中心有限公司 | A kind of processing system and method for acid waste liquid |
-
2019
- 2019-06-13 CN CN201920894183.4U patent/CN210313808U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110127907A (en) * | 2019-06-13 | 2019-08-16 | 兖矿水煤浆气化及煤化工国家工程研究中心有限公司 | A kind of processing system and method for acid waste liquid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205151986U (en) | Zero discharge system of coal fired power plant wet flue gas desulfurization waste water | |
| CN103950991B (en) | Waste acid and wastewater treatment process in processes of pickling and purifying quartz or feldspar | |
| CN107089744B (en) | A kind of method of desulfurization wastewater advanced treating zero-emission | |
| CN103771630A (en) | Process for treating and recycling mine acid heavy metal wastewater | |
| CN109850930B (en) | Recovery device and recovery method for waste nitric acid and waste aluminum nitrate in electrode foil production | |
| CN109851139B (en) | High-salt wastewater softening and concentrating device and method | |
| CN107698092A (en) | A kind of packaged type fluorine-containing wastewater treatment method and device | |
| CN112573704A (en) | System and method for treating strong brine by using micro-channel reactor | |
| CN105036404A (en) | Zero discharge treatment method for acid wastewater generated by acid pickling and purification of quartz sand powder or feldspar sand powder | |
| CN110981000A (en) | Method for treating silicon steel magnesium oxide wastewater | |
| CN107244773A (en) | The technique of zero discharge and equipment of desulfurization wastewater Treatment and recovery | |
| CN210313808U (en) | Processing system of acid waste liquid | |
| CN105347546B (en) | A kind of processing method and its system of pyrite-based sulfuric acid production waste water | |
| CN107265696A (en) | A kind of desulfurization wastewater sofening treatment device and method | |
| CN103304072B (en) | Recycling method of industrial waste water | |
| CN209065496U (en) | A kind of integral type desulfurization method of limestone-gypsum effluent purifying device | |
| CN207567053U (en) | A kind of packaged type fluorine-containing waste water processing apparatus | |
| CN216890431U (en) | High-concentration fluoride removing combined device in industrial wastewater | |
| CN207121501U (en) | A kind of hardness removing device suitable for the hard waste water of high magnesium | |
| CN115403049A (en) | Purification method and purification system of quartz sand | |
| CN109095483A (en) | A kind of system and its application method of oxalate precipitation method recycling power plant desulfurization wastewater calcium and magnesium | |
| CN209065501U (en) | A kind of desulfurization wastewater treatment system | |
| CN208279426U (en) | The reclaiming system for the treatment of of wastewater from stripping in a kind of PVC Production Process | |
| CN212198793U (en) | Comprehensive purification system for desulfurization wastewater by limestone-gypsum method | |
| CN209411966U (en) | The processing system of acid heavy metal wastewater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |