CN115925193A - Thallium-containing wastewater treatment process in lithium carbonate industry - Google Patents
Thallium-containing wastewater treatment process in lithium carbonate industry Download PDFInfo
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- CN115925193A CN115925193A CN202310024208.6A CN202310024208A CN115925193A CN 115925193 A CN115925193 A CN 115925193A CN 202310024208 A CN202310024208 A CN 202310024208A CN 115925193 A CN115925193 A CN 115925193A
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- lithium carbonate
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- 229910052716 thallium Inorganic materials 0.000 title claims abstract description 61
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 19
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 title claims abstract description 18
- 229910052808 lithium carbonate Inorganic materials 0.000 title claims abstract description 18
- 239000002351 wastewater Substances 0.000 claims abstract description 97
- 239000010802 sludge Substances 0.000 claims abstract description 64
- 230000003311 flocculating effect Effects 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims description 55
- 238000004062 sedimentation Methods 0.000 claims description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 238000005189 flocculation Methods 0.000 claims description 34
- 230000016615 flocculation Effects 0.000 claims description 34
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 32
- 238000001556 precipitation Methods 0.000 claims description 25
- 239000002245 particle Substances 0.000 claims description 23
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 22
- 239000013049 sediment Substances 0.000 claims description 21
- 239000012065 filter cake Substances 0.000 claims description 18
- 239000002244 precipitate Substances 0.000 claims description 15
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 14
- 239000004744 fabric Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 12
- 239000008394 flocculating agent Substances 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- 239000003822 epoxy resin Substances 0.000 claims description 11
- 229920000647 polyepoxide Polymers 0.000 claims description 11
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 11
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 7
- 238000006386 neutralization reaction Methods 0.000 claims description 7
- 239000006228 supernatant Substances 0.000 claims description 7
- 238000005536 corrosion prevention Methods 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 5
- 239000006004 Quartz sand Substances 0.000 claims description 5
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 5
- 239000003830 anthracite Substances 0.000 claims description 5
- 229910001424 calcium ion Inorganic materials 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 239000011572 manganese Substances 0.000 claims description 5
- 239000011150 reinforced concrete Substances 0.000 claims description 5
- 239000010963 304 stainless steel Substances 0.000 claims description 3
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
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- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 238000006115 defluorination reaction Methods 0.000 claims description 2
- 238000000746 purification Methods 0.000 abstract description 10
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- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
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- 238000005345 coagulation Methods 0.000 description 2
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- 239000004567 concrete Substances 0.000 description 2
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- 159000000000 sodium salts Chemical class 0.000 description 2
- 208000026015 thallium poisoning Diseases 0.000 description 2
- 239000004912 1,5-cyclooctadiene Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
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- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
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- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
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- 239000011701 zinc Substances 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Removal Of Specific Substances (AREA)
Abstract
The invention relates to the technical field of sewage treatment, in particular to a thallium-containing wastewater treatment process in the lithium carbonate industry. The invention aims to provide a thallium-containing wastewater treatment process in lithium carbonate industry, which is characterized in that thallium is treated independently by purification modes of respectively reacting, flocculating and precipitating common elements and thallium, so that the thallium purification degree is greatly improved, wastewater is discharged within a safety standard, thallium sludge is effectively distinguished from other sludge, and thallium-containing waste sludge is introduced, namely, the discharge amount of dangerous waste is reduced.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a thallium-containing wastewater treatment process in the lithium carbonate industry.
Background
The rapid development of industrialization enables a large amount of heavy metal wastewater to be discharged into the environment, the acidic heavy metal wastewater has a low pH value (the pH value is between 4 and 6) and contains various heavy metal ions, such as copper, lead, zinc, cadmium, arsenic, thallium and the like, which cannot be decomposed by organisms, and once entering the environment, the acidic heavy metal wastewater can be continuously accumulated in the environment, which can cause serious pollution to water bodies and even destroy the ecological environment.
Thallium (T l) belongs to rare dispersed metal and is a highly toxic heavy metal pollutant, thallium poisoning can cause diseases of respiratory system and digestive system, and finally cause damage to nervous system, and severe thallium poisoning is enough to cause death of human and animals.
Currently, the main methods for removing thallium from wastewater include an oxidation precipitation method, a sulfide precipitation method, an adsorption method, a biological method and the like.
Prior art one, for example application number CN202220497134.9, the name is the utility model patent of a well high concentration contains thallium industrial wastewater treatment device, provides a well high concentration contains thallium industrial wastewater treatment device, include: the pretreatment unit, the medicament reaction unit, the coagulation unit and the solid-liquid separation unit are sequentially connected in series; the pretreatment unit is provided with a wastewater inlet pipe; the drug reaction unit includes: the water inlet end of the reagent reaction tank is connected with the water outlet end of the pretreatment unit; the coagulation unit comprises a coagulant reaction tank and a coagulant addition tank, and the water inlet end of the coagulant reaction tank is connected with the water outlet end of the medicament reaction tank; the solid-liquid separation unit comprises a PH adjusting tank and a solid-liquid separation component, wherein the water inlet end of the PH adjusting tank is connected with the water outlet end of the coagulant reaction tank, and the water outlet end of the PH adjusting tank is connected with the solid-liquid separation component. The treatment device has the advantages of compact process, shortened treatment time of water treatment, simple structure, low treatment cost, small by-product and wide application range, and is particularly suitable for efficiently removing thallium from medium-high-concentration industrial wastewater.
Second, for example, the utility model with application number CN201821040079.0 entitled thallium-containing wastewater treatment device and thallium-containing wastewater treatment device containing the same provides a thallium-containing wastewater treatment device comprising an electric control device, a neutralization tank, a pH meter, a first filter press, a collection tank, a fluidized bed reaction tank, a sand filter, a second filter press, a first pump, a second pump, a third pump and a fourth pump. The thallium-containing wastewater treatment device comprises a first storage tank, a boiler desulfurization device, a third filter press, a second storage tank, a thallium removal device, a third storage tank, a percolate treatment device, a precipitation device, a boiler dedusting device, a fifth pump, a sixth pump, a seventh pump, an eighth pump and a ninth pump.
The above techniques all have the condition that the thallium concentration treatment in the wastewater is not up to the standard.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the thallium-containing wastewater treatment process in the lithium carbonate industry, which has the purification modes of tertiary reaction, secondary flocculation and secondary precipitation, and can be used for carrying out single precipitation, flocculation and precipitation on thallium, so that the thallium purification degree is greatly improved, the wastewater is ensured to be discharged within the safety standard, and thallium sludge is effectively distinguished from other sludge, so that the thallium-containing waste sludge content is reduced, namely the discharge amount of dangerous waste is reduced.
The technical purpose of the invention is realized by the following technical scheme: the thallium-containing wastewater treatment process in the lithium carbonate industry comprises the following steps according to the traveling direction of wastewater:
s1, opening a start-stop valve, enabling the wastewater to flow into a first reaction tank from a wastewater collection tank, wherein a sodium carbonate solution is contained in the first reaction tank, and the purpose is that calcium ions in the wastewater and the sodium carbonate solution form calcium carbonate precipitation;
s2, allowing the wastewater to flow into a second reaction tank in which a sodium hydroxide solution and a defluorination agent are added;
s3, the wastewater flows into a first flocculation tank in which a flocculating agent is put, and the flocculating agent is used for flocculating fine sediments and organic matter particles into large-particle sediments;
s4, enabling the wastewater to flow into a first sedimentation tank for settling large-particle sediments and wastewater in the step S4;
s5, the wastewater passes through a multi-media filter and is used for filtering and removing non-precipitated fine suspended matters;
s6, enabling the wastewater to flow into a third reaction tank in which a thallium removal agent is put, and separating thallium components in the wastewater from the wastewater to form precipitates;
s7, putting a second flocculation tank with a flocculating agent, wherein the second flocculation tank is used for forming large-particle floccules on the sediment;
s8, enabling the wastewater to flow into a second sedimentation tank, and settling large-particle sediments to obtain clear water;
and (9) allowing the clean water obtained in the step (S8) to flow into a clean water tank for storage or discharge.
Preferably, the waste water collecting tank is at least one of rotary kiln tail gas treatment water, tunnel kiln tail gas treatment waste water, circulating cooling water and initial rainwater.
Preferably, the first sedimentation tank is communicated with the first sludge tank, the first sedimentation sludge is conveyed to the plate-and-frame filter press through the screw conveying pump to obtain sludge filter cakes, supernatant of the sludge tank flows back to the first flocculation tank to be mixed with wastewater, the second sedimentation tank is communicated with the second sludge tank, and the second sedimentation sludge is conveyed to the plate-and-frame filter press through the screw conveying pump to obtain the sludge filter cakes.
Preferably, the first reaction tank, the second reaction tank, the first flocculation tank, the second flocculation tank, the first sedimentation tank, the second sedimentation tank, the first sludge tank and the second sludge tank are all made of reinforced concrete materials, and epoxy resin is adopted in the first sedimentation tank and the second sedimentation tank to perform three-oil two-cloth anti-corrosion treatment.
Preferably, the reaction time of the first reaction tank and the second reaction tank is 13-18min, and a stirrer is arranged, and the stirrer is made of 304 stainless steel.
Preferably, the settling time in the first settling tank and the second settling tank is 1.5h-2.5h, and the first settling tank and the second settling tank are vertical flow settling tanks.
Preferably, the plate-and-frame filter press is a full-automatic pull plate type box filter press.
Preferably, the multi-media filter comprises a cylinder and a filter material, wherein the cylinder is made of carbon steel lining rubber, and the filter material is at least one of quartz sand, anthracite and manganese sand.
Preferably, a neutralization pond is arranged between the second sedimentation pond and the clean water pond, and dilute sulfuric acid solution is added into the neutralization pond and is used for adjusting the pH value of the clean water to 6-9.
More preferably, the concentration of the dilute sulfuric acid is 30% +/-5%, the concentration of the liquid caustic soda is 40% +/-5%, the concentration of the sodium carbonate is 30% +/-5%, and the flocculating agent is polyacrylamide.
The process of the invention is as follows:
the method comprises the following steps of performing first reaction, flocculation and precipitation, starting at least one of waste water of rotary kiln tail gas treatment water, tunnel kiln tail gas treatment waste water, circulating cooling water and initial rainwater of an opening and closing valve, enabling the waste water to flow into a first reaction tank, and enabling a sodium carbonate solution in the first reaction tank and calcium ions in the waste water to form calcium carbonate precipitation; then the wastewater flows into a second reaction tank, a fluorine removal agent in the second reaction tank is used for removing fluorine elements in the wastewater, a sodium hydroxide solution is used for adjusting the pH value of the wastewater on one hand and is used for reacting with acidic substances in the wastewater to form sodium salt which is beneficial to the precipitation of a precipitation tank on the other hand, then the sodium hydroxide solution flows into a first precipitation tank to statically precipitate large-particle precipitates and other precipitates in the wastewater, supernatant of an upper layer sludge tank flows back to the first flocculation tank to be mixed with the wastewater, and a plate-and-frame filter press obtains a sludge filter cake;
the wastewater passes through a multi-medium filter, and fine suspended matters which are not precipitated are filtered and removed by at least two materials of quartz sand, anthracite and manganese sand;
the wastewater flows into a third reaction tank, thallium removal agents enable thallium elements in the wastewater to form precipitates, the precipitates are separated from the wastewater, and then the wastewater flows into a second flocculation tank, so that the precipitates form large-particle floccules; then the sewage flows into a second sedimentation tank to precipitate large-particle sediments to obtain clear water, the large-particle sediments are filtered by a plate-and-frame filter press to obtain sludge filter cakes, and the clear water flows into a clear water tank for storage or discharge.
According to the invention, other impurities in the wastewater are clarified by a first reaction-flocculation-precipitation purification mode, and the qualification of the thallium content in the wastewater is ensured by a second reaction-flocculation-precipitation purification mode specially used for thallium purification.
The invention has the following beneficial effects:
the method comprises the following steps that firstly, a first reaction tank, a second reaction tank, a first flocculation tank, a second flocculation tank, a first sedimentation tank, a second sedimentation tank, a first sludge tank and a second sludge tank are all made of reinforced concrete materials, epoxy resin is adopted in the first reaction tank, the second sedimentation tank, the first sludge tank and the second sludge tank for three-oil-two-cloth corrosion prevention treatment, wherein the three-oil-two-cloth corrosion prevention treatment comprises the steps of coating a layer of epoxy resin on the surface of concrete, then laying a layer of glass fiber cloth, sequentially coating a layer of epoxy resin, then laying a layer of glass fiber cloth, and finally coating a layer of epoxy resin on the surface of the glass fiber cloth again to enhance the corrosion resistance and service life of the first reaction tank, the second reaction tank, the first flocculation tank, the second flocculation tank, the first sedimentation tank, the second sedimentation tank, the first sludge tank and the second sludge tank;
secondly, the tail gas of the rotary kiln is used for treating water, the tail gas of the tunnel kiln is used for treating wastewater, pollutants comprise COD, SS, thallium, circulating cooling water and the risk that the thallium content exceeds the standard in the initial rainwater, so that the wastewater collection pool at least comprises one of the above steps;
thirdly, the sludge filter cake obtained by the first precipitated sludge is mainly a sludge filter cake formed by calcium carbonate and other impurities, and the sludge filter cake obtained by the second precipitated sludge is mainly a thallium-containing sludge filter cake;
fourthly, the first sedimentation tank and the second sedimentation tank are vertical sedimentation tanks, which are more beneficial to sludge sedimentation under the action of the ground compared with a transverse sedimentation tank;
fifthly, the full-automatic pull plate type box filter press adopts an embedded filter plate, and has the characteristics of simple structure and no sewage leakage in the filter pressing process. The automatic plate pulling type can reduce the labor intensity of operators and improve the working efficiency.
Drawings
FIG. 1 is a schematic flow chart of the present invention
Detailed Description
The invention is described in detail below with reference to the figures and examples.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, are used based on the orientations and positional relationships shown in the drawings, and are used merely for convenience of description of the present invention, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1, a thallium-containing wastewater treatment process in lithium carbonate industry includes the following steps according to the traveling direction of wastewater:
s1, opening an opening and closing valve, enabling the wastewater to flow into a first reaction tank from a wastewater collection tank, and filling a sodium carbonate solution in the first reaction tank, wherein the aim is that calcium ions in the wastewater and the sodium carbonate solution form calcium carbonate precipitates;
s2, allowing the wastewater to flow into a second reaction tank filled with a sodium hydroxide solution and a defluorinating agent;
s3, enabling the wastewater to flow into a first flocculation tank filled with a flocculating agent, wherein the flocculating agent is used for flocculating fine sediments and organic matter particles into large-particle sediments;
s4, the wastewater flows into a first sedimentation tank and is used for settling large-particle sediments and supernatant of a sludge tank in the step S4;
s5, enabling the wastewater to pass through a multi-media filter for filtering and removing non-precipitated fine suspended matters;
s6, enabling the wastewater to flow into a third reaction tank in which a thallium removal agent is put, and separating thallium components in the wastewater from the wastewater to form precipitates;
s7, putting a second flocculation tank with a flocculating agent, wherein the second flocculation tank is used for forming large-particle floccules on the sediment;
s8, enabling the wastewater to flow into a second sedimentation tank, and settling large-particle sediments to obtain clear water;
and (9) allowing the clean water obtained in the step (S8) to flow into a clean water tank for storage or discharge.
Specifically, the waste water collecting pool is at least one of rotary kiln tail gas treatment water, tunnel kiln tail gas treatment waste water, circulating cooling water and initial rainwater.
Specifically, first sedimentation tank and first sludge impoundment intercommunication carry first sediment mud to plate and frame filter press through the screw rod delivery pump and obtain the mud filter cake, and the mud impoundment supernatant flows back and mixes with waste water in the first flocculation basin, and second sedimentation tank and second sludge impoundment intercommunication carry the second sediment mud to plate and frame filter press through the screw rod delivery pump and obtain the mud filter cake.
Specifically, the first reaction tank, the second reaction tank, the first flocculation tank, the second flocculation tank, the first sedimentation tank, the second sedimentation tank, the first sludge tank and the second sludge tank are all made of reinforced concrete materials, and epoxy resin is adopted in the first sludge tank and the second sludge tank to perform three-oil-two-cloth corrosion prevention treatment.
Specifically, the reaction time of the first reaction tank and the second reaction tank is 15min, and a stirrer is arranged, and the stirrer is made of 304 stainless steel.
Specifically, the settling time in the first settling tank and the second settling tank is 2 hours, and the first settling tank and the second settling tank are vertical settling tanks.
In particular, the plate-and-frame filter press is a full-automatic pull plate type box-type filter press.
Specifically, the multi-media filter comprises a cylinder body and a filter material, wherein the cylinder body is made of carbon steel lining rubber, and the filter material is at least one of quartz sand, anthracite and manganese sand.
Specifically, a neutralization pond is arranged between the second sedimentation pond and the clean water pond, and dilute sulfuric acid solution is put into the neutralization pond and is used for adjusting the pH value of the clean water to be 7.
Specifically, the concentration of the dilute sulfuric acid is 30%, the concentration of the liquid caustic soda is 40%, the concentration of the sodium carbonate is 30%, and the flocculating agent is polyacrylamide.
The process of this embodiment is:
the method comprises the following steps of performing first reaction, flocculation and precipitation, starting at least one of waste water of rotary kiln tail gas treatment water, tunnel kiln tail gas treatment waste water, circulating cooling water and initial rainwater of an opening and closing valve, enabling the waste water to flow into a first reaction tank, and enabling a sodium carbonate solution in the first reaction tank and calcium ions in the waste water to form calcium carbonate precipitation; then the wastewater flows into a second reaction tank, a fluorine removal agent in the second reaction tank is used for removing fluorine elements in the wastewater, a sodium hydroxide solution is used for adjusting the pH value of the wastewater on the one hand, and is used for reacting with acidic substances in the wastewater to form sodium salt so as to facilitate the precipitation of the precipitation tank on the other hand, then the sodium hydroxide solution flows into a first precipitation tank to precipitate large-particle precipitates and other precipitates in the wastewater statically, supernatant of an upper layer sludge tank flows back to the first flocculation tank to be mixed with the wastewater, and a plate-and-frame filter press obtains a sludge filter cake;
the wastewater passes through a multi-media filter, and fine suspended matters which are not precipitated are filtered and removed by at least two materials of quartz sand, anthracite and manganese sand;
the wastewater flows into a third reaction tank, thallium removal agents enable thallium elements in the wastewater to form precipitates, the precipitates are separated from the wastewater, and then the wastewater flows into a second flocculation tank, so that the precipitates form large-particle floccules; then the sewage flows into a second sedimentation tank to precipitate large-particle sediments to obtain clear water, the large-particle sediments are filtered by a plate-and-frame filter press to obtain sludge filter cakes, and the clear water flows into a clear water tank for storage or discharge.
In the embodiment, other impurities in the wastewater are clarified by a first reaction-flocculation-precipitation purification mode, and the qualification of the thallium content of the wastewater is ensured by a second reaction-flocculation-precipitation purification mode specially used for thallium purification.
Wherein:
the method comprises the following steps that firstly, a first reaction tank, a second reaction tank, a first flocculation tank, a second flocculation tank, a first sedimentation tank, a second sedimentation tank, a first sludge tank and a second sludge tank are all made of reinforced concrete materials, epoxy resin is adopted in the first reaction tank, the second sedimentation tank, the first sludge tank and the second sludge tank for three-oil-two-cloth corrosion prevention treatment, wherein the three-oil-two-cloth corrosion prevention treatment comprises the steps of coating a layer of epoxy resin on the surface of concrete, then laying a layer of glass fiber cloth, sequentially coating a layer of epoxy resin, then laying a layer of glass fiber cloth, and finally coating a layer of epoxy resin on the surface of the glass fiber cloth again to enhance the corrosion resistance and service life of the first reaction tank, the second reaction tank, the first flocculation tank, the second flocculation tank, the first sedimentation tank, the second sedimentation tank, the first sludge tank and the second sludge tank;
secondly, the tail gas of the rotary kiln is used for treating water, the tail gas of the tunnel kiln is used for treating waste water and pollutants, COD, SS, thallium, circulating cooling water and initial rainwater have the risk of exceeding the thallium content, so that the waste water collecting pool at least comprises one of the above components;
sixthly, the sludge filter cake obtained by the first precipitated sludge is mainly a sludge filter cake formed by calcium carbonate and other impurities, and the sludge filter cake obtained by the second precipitated sludge is mainly a thallium-containing sludge filter cake;
seventhly, the first sedimentation tank and the second sedimentation tank are vertical sedimentation tanks, so that sludge is more beneficial to sedimentation under the action of the ground compared with a transverse sedimentation tank;
the full-automatic draw plate type box filter press adopts an embedded filter plate, and has the characteristics of simple structure and no sewage leakage in the filter pressing process. The automatic plate pulling type can reduce the labor intensity of operators and improve the working efficiency.
In the example, the pH of the clear water in the total discharge port was 7, the fluoride was 4.1, and the thallium was 0.0023
Meets the standards of inorganic chemical industry pollutant discharge standard GB31573-2015 that the pH is 6-9, the fluoride is less than or equal to 6, and the thallium is less than or equal to 0.005.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The thallium-containing wastewater treatment process in the lithium carbonate industry is characterized by comprising the following steps in the traveling direction of wastewater:
s1, opening a start-stop valve, enabling the wastewater to flow into a first reaction tank from a wastewater collection tank, wherein a sodium carbonate solution is contained in the first reaction tank, and the purpose is that calcium ions in the wastewater and the sodium carbonate solution form calcium carbonate precipitation;
s2, allowing the wastewater to flow into a second reaction tank in which a sodium hydroxide solution and a defluorination agent are added;
s3, enabling the wastewater to flow into a first flocculation tank filled with a flocculating agent, wherein the flocculating agent is used for flocculating fine sediments and organic matter particles into large-particle sediments;
s4, enabling the wastewater to flow into a first sedimentation tank and be used for settling large-particle sediments and sludge tank supernatant in the step S4;
s5, enabling the wastewater to pass through a multi-media filter for filtering and removing non-precipitated fine suspended matters;
s6, enabling the wastewater to flow into a third reaction tank in which a thallium removal agent is put, and separating thallium components in the wastewater from the wastewater to form precipitates;
s7, putting a second flocculation tank with a flocculating agent, wherein the second flocculation tank is used for forming large-particle floccules on the sediment;
s8, enabling the wastewater to flow into a second sedimentation tank, and settling large-particle sediments to obtain clear water;
and (9) allowing the clean water obtained in the step (S9) and the step (S8) to flow into a clean water tank for storage or discharge.
2. The thallium-containing wastewater treatment process in the lithium carbonate industry as claimed in claim 1, wherein the wastewater collection pool is at least one of rotary kiln tail gas treatment water, tunnel kiln tail gas treatment wastewater, circulating cooling water and initial rainwater.
3. The thallium-containing wastewater treatment process in the lithium carbonate industry as claimed in claim 1, wherein the first sedimentation tank is communicated with a first sludge tank, the first sedimentation sludge is conveyed to the plate-and-frame filter press through a screw conveying pump to obtain a sludge filter cake, a supernatant of the sludge tank flows back to the first flocculation tank to be mixed with the wastewater, the second sedimentation tank is communicated with a second sludge tank, and the second sedimentation sludge is conveyed to the plate-and-frame filter press through the screw conveying pump to obtain the sludge filter cake.
4. The thallium-containing wastewater treatment process in the lithium carbonate industry as claimed in claim 3, wherein the first reaction tank, the second reaction tank, the first flocculation tank, the second flocculation tank, the first sedimentation tank, the second sedimentation tank, the first sludge tank and the second sludge tank are all constructed by reinforced concrete materials and internally adopt epoxy resin for three-oil-two-cloth corrosion prevention treatment.
5. The process for treating thallium-containing wastewater in lithium carbonate industry as claimed in claim 1, wherein the reaction time of the first reaction tank and the second reaction tank is 13-18min, and the stirrer is made of 304 stainless steel.
6. The process for treating thallium-containing wastewater in lithium carbonate industry as claimed in claim 1, wherein the precipitation time in the first and second precipitation tanks is 1.5h-2.5h, and the first and second precipitation tanks are vertical flow type.
7. The process for treating thallium-containing wastewater in lithium carbonate industry according to claim 3, wherein the plate-and-frame filter press is a full-automatic plate-pulling type chamber filter press.
8. The process for treating thallium-containing wastewater in lithium carbonate industry as claimed in claim 1, wherein the multi-media filter comprises a cylinder and a filter material, the cylinder is made of carbon steel lining rubber, and the filter material is at least one of quartz sand, anthracite and manganese sand.
9. The thallium-containing wastewater treatment process in the lithium carbonate industry as claimed in claim 1, wherein a neutralization tank is arranged between the second sedimentation tank and the clean water tank, and a dilute sulfuric acid solution is added into the neutralization tank for adjusting the pH value of the clean water to 6-9.
10. The process for treating thallium-containing wastewater in lithium carbonate industry as claimed in claim 9, wherein the dilute sulfuric acid concentration is 30% ± 5%, the caustic soda lye concentration is 40% ± 5%, the sodium carbonate concentration is 30% ± 5%, and the flocculating agent is polyacrylamide.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117886488A (en) * | 2024-03-18 | 2024-04-16 | 广东工业大学 | Thallium-containing wastewater treatment device and treatment method |
| CN118026482A (en) * | 2024-04-15 | 2024-05-14 | 广州松和环保科技股份有限公司 | Wastewater treatment device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117886488A (en) * | 2024-03-18 | 2024-04-16 | 广东工业大学 | Thallium-containing wastewater treatment device and treatment method |
| CN118026482A (en) * | 2024-04-15 | 2024-05-14 | 广州松和环保科技股份有限公司 | Wastewater treatment device |
| CN118026482B (en) * | 2024-04-15 | 2024-06-14 | 广州松和环保科技股份有限公司 | Wastewater treatment device |
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