CN110981066A - Ammonium molybdate-containing wastewater recovery treatment process method - Google Patents
Ammonium molybdate-containing wastewater recovery treatment process method Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 124
- 238000000034 method Methods 0.000 title claims abstract description 67
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 title claims abstract description 53
- 239000011609 ammonium molybdate Substances 0.000 title claims abstract description 53
- 229940010552 ammonium molybdate Drugs 0.000 title claims abstract description 53
- 235000018660 ammonium molybdate Nutrition 0.000 title claims abstract description 53
- 238000011084 recovery Methods 0.000 title description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000006243 chemical reaction Methods 0.000 claims abstract description 36
- 230000009615 deamination Effects 0.000 claims abstract description 26
- 238000006481 deamination reaction Methods 0.000 claims abstract description 26
- 238000001704 evaporation Methods 0.000 claims abstract description 20
- 230000008020 evaporation Effects 0.000 claims abstract description 20
- 230000005484 gravity Effects 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000000926 separation method Methods 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 238000004064 recycling Methods 0.000 claims abstract description 15
- 239000002244 precipitate Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 6
- 238000004806 packaging method and process Methods 0.000 claims abstract description 4
- 239000002562 thickening agent Substances 0.000 claims abstract description 4
- 150000001768 cations Chemical class 0.000 claims description 18
- 239000012535 impurity Substances 0.000 claims description 16
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 13
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 13
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 13
- 239000003814 drug Substances 0.000 claims description 10
- 239000011552 falling film Substances 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 150000001450 anions Chemical class 0.000 claims description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- IWOUKMZUPDVPGQ-UHFFFAOYSA-N barium nitrate Chemical compound [Ba+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O IWOUKMZUPDVPGQ-UHFFFAOYSA-N 0.000 claims description 8
- 229910021529 ammonia Inorganic materials 0.000 claims description 6
- 239000003153 chemical reaction reagent Substances 0.000 claims description 6
- 230000009290 primary effect Effects 0.000 claims description 6
- 230000009291 secondary effect Effects 0.000 claims description 6
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 4
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 230000005494 condensation Effects 0.000 abstract 1
- 238000009833 condensation Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 6
- 239000010865 sewage Substances 0.000 description 6
- 238000009388 chemical precipitation Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- -1 ammonia nitrogen ions Chemical class 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- CVTZKFWZDBJAHE-UHFFFAOYSA-N [N].N Chemical class [N].N CVTZKFWZDBJAHE-UHFFFAOYSA-N 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- RCMWGBKVFBTLCW-UHFFFAOYSA-N barium(2+);dioxido(dioxo)molybdenum Chemical compound [Ba+2].[O-][Mo]([O-])(=O)=O RCMWGBKVFBTLCW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229940116318 copper carbonate Drugs 0.000 description 1
- GEZOTWYUIKXWOA-UHFFFAOYSA-L copper;carbonate Chemical compound [Cu+2].[O-]C([O-])=O GEZOTWYUIKXWOA-UHFFFAOYSA-L 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- RAQDACVRFCEPDA-UHFFFAOYSA-L ferrous carbonate Chemical compound [Fe+2].[O-]C([O-])=O RAQDACVRFCEPDA-UHFFFAOYSA-L 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000013386 optimize process Methods 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/08—Thin film evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention discloses a process method for recycling waste water containing ammonium molybdate, which comprises the following steps: a. ammonium molybdate wastewater pretreatment: b. ammonium molybdate wastewater deamination procedure: c. and (3) an ammonium molybdate wastewater evaporation process: and (4) the wastewater after full reaction enters a solid-liquid separator II, and the precipitate generated by the reaction is removed by using a gravity settling method. The clarified ammonium molybdate wastewater after gravity settling separation enters a reaction barrel, is lifted by a first-effect forced evaporator and enters a vacuum crystallizer, is crystallized in the vacuum crystallizer, and is then lifted to a thickener, a centrifuge, a dryer and a packaging machine in sequence to prepare finished nitrate; raw steam firstly enters a heating chamber of the first-effect forced circulation evaporator to be heated, then condensed water returns to a boiler room after heat exchange, secondary steam generated by the first-effect forced circulation evaporator is sent to the heating chamber of the second-effect forced circulation evaporator to be used as a heat source to heat the heating chamber, then the condensed water enters a raw condensed water tank, condensed water after condensation is decomposed enters a condensed water tank, and water in the condensed water tank is conveyed back to the ammonium molybdate production process for recycling or other purposes after heat exchange.
Description
Technical Field
The invention relates to the technical field of industrial sewage treatment, in particular to a process method for recovering and treating waste water containing ammonium molybdate.
Background
Along with the increasing attention of the country to the environmental protection business, the relevant standards of environmental protection are more and more strict, the wastewater generated in the ammonium molybdate production industry is discharged after being simply treated, and the treated ammonium molybdate wastewater can not meet the discharge standards of the country and the industry, the wastewater contains heavy metal impurities, alkaline earth metal impurities and a large amount of ammonium nitrate besides molybdenum, and is difficult to treat for a long time, valuable metals are lost after being discharged, and the heavy metals and ammonia nitrogen compounds pollute the environment, so that the comprehensive treatment of the industrial wastewater in the ammonium molybdate production is necessary, the excessive ammonia nitrogen ions in the ammonium molybdate wastewater is a practical problem facing a plurality of domestic ammonium molybdate production enterprises, and a perfect treatment method and a facility are not available in China for a long time, and a certain recyclable product also exists in the ammonium molybdate wastewater, how to treat the wastewater to reach the standard and discharge and not bring secondary pollutants is a main problem to be solved for wastewater treatment Therefore, a process which can meet the standard discharge after sewage treatment, cannot generate new pollution and can realize resource recycling needs to be designed through the analysis of the source of sewage generation.
Disclosure of Invention
In order to solve the problems in the existing ammonium molybdate production wastewater treatment, the invention provides a process for recovering and treating ammonium molybdate-containing wastewater, which does not produce secondary pollution wastewater in the whole treatment process, and extracts the products of ammonia water, sodium nitrate salt and pure evaporation condensate water from the wastewater by the process, thereby realizing zero discharge of sewage and recycling wastewater.
The technical scheme adopted by the invention for solving the technical problem is that the process method for recycling the wastewater containing ammonium molybdate comprises the following steps:
a. ammonium molybdate wastewater pretreatment: lifting the wastewater from a wastewater pool to a reaction barrel I, adding a reagent I into the reaction barrel I, removing impurity anions except main anions in the wastewater, feeding the fully reacted wastewater into a solid-liquid separator I, removing precipitates generated by the reaction by using a gravity settling method, feeding clarified wastewater subjected to gravity settling separation into a reaction barrel II, adding a reagent II into the reaction barrel II, removing impurity cations except main cations in the wastewater, feeding the fully reacted wastewater into a solid-liquid separator II, removing precipitates generated by the reaction by using a gravity settling method, feeding the clarified wastewater subjected to gravity settling separation into a reaction barrel III, adding a reagent III into the reaction barrel III, further removing impurity cations except main cations dissolved in a trace amount in the wastewater, feeding the fully reacted wastewater into a solid-liquid separator III, removing the precipitates generated by the reaction by using a gravity settling method, the clarified wastewater after gravity settling separation is lifted by a pump to enter a precision filter, and trace solid impurities contained in the wastewater are further removed; the medicament I is barium nitrate, the medicament II is sodium carbonate or sodium hydroxide, and the medicament III is sodium sulfide;
b. ammonium molybdate wastewater deamination procedure: after the pretreatment procedure, the wastewater enters a deamination wastewater pool, liquid alkali is added into the deamination wastewater pool to adjust the pH of the wastewater to 11-12, the wastewater is lifted to exchange heat with the effluent of a tower kettle, then enters a deamination tower, passes through the deamination tower and then the effluent of the tower kettle is sent to an evaporation procedure, and ammonia-containing steam at the tower top is condensed and absorbed by a condenser and an ammonia water preparation pry block to prepare ammonia water;
c. and (3) an ammonium molybdate wastewater evaporation process: after the deamination process, the wastewater enters an evaporation water tank, the pH value of the wastewater is adjusted to be below 7, then the wastewater is lifted to exchange heat with secondary effect condensed water, then the wastewater exchanges heat with primary effect condensed water and enters an MVR falling film evaporator, the wastewater from the MVR falling film evaporator is lifted to enter a secondary effect forced evaporator, the wastewater from the secondary effect forced evaporator is lifted to enter a primary effect forced evaporator, the wastewater from the primary effect forced evaporator is lifted to enter a vacuum crystallizer, the wastewater is crystallized in the vacuum crystallizer, and then the wastewater is lifted to a thickener, a centrifugal machine, a drying machine and a packaging machine in sequence to prepare finished nitrate; raw steam firstly enters a heating chamber of a first-effect forced circulation evaporator to be heated, then condensed water returns to a boiler room after heat exchange, secondary steam generated by a first-effect forced circulation evaporation chamber is sent to a heating chamber of a second-effect forced circulation evaporator to be used as a heat source to heat the heating chamber, then the condensed water enters a raw condensed water tank, the secondary steam generated by the evaporation chamber of the second-effect forced circulation evaporator is condensed and vacuumized, the condensed water enters a condensed water tank, the secondary steam generated by an evaporation chamber of an MVR falling-film evaporator enters an MVR compressor to be used as the heat source of the MVR heating chamber after being compressed and heated, the condensed water enters the condensed water tank, and water in the condensed water tank is conveyed back to an ammonium molybdate production process for recycling or other purposes after heat exchange.
Further, the precision filter in the step a is a precision filter with a filtration precision of 0.5 micron or less.
Further, the cation content of the effluent after the ammonium molybdate wastewater deamination procedure treatment in the step a is as follows: mo is less than or equal to 0.5 mg/L; cu is less than or equal to 0.5 mg/L; fe is less than or equal to 0.1 mg/L; ca is less than or equal to 0.1 mg/L.
And further, the content of ammonia nitrogen in the tower kettle effluent of the deamination tower in the ammonium molybdate wastewater deamination procedure in the step b is less than or equal to 10 mg/L.
The invention has the beneficial effects that: the ammonium molybdate wastewater is effectively recycled by an optimized process, impurities, anions and cations in the wastewater can be effectively removed by the graded precipitation treatment adopted in the pretreatment process, and the content of the impurities, anions and cations in the treated wastewater can reach the discharge standard of inorganic chemical industry pollutants. The ammonia nitrogen content can be reduced to be below 10mg/L by the ammonia removal process adopted in the ammonia removal process, 5-25% concentration ammonia water can be prepared, the MVR falling film evaporation and counter-current double-effect forced circulation evaporation process is adopted in the evaporation process, fresh steam consumption is greatly saved, finished nitrate and purer condensed water are prepared, the problem of sewage discharge is solved by treating ammonium molybdate wastewater through the processes, water resources are saved, energy recycling is realized, and zero sewage discharge is realized.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
A process method for recycling and treating waste water containing ammonium molybdate comprises the following steps:
a. ammonium molybdate wastewater pretreatment: the wastewater is lifted to a reaction barrel I from a wastewater pool by a pump, and a medicament I (barium nitrate) is added into the reaction barrel I to remove impurity anions except main anions in the ammonium molybdate wastewater by utilizing the chemical precipitation reaction principle. And (3) the wastewater after full reaction enters a solid-liquid separator I, and the precipitate generated by the reaction is removed by using a gravity settling method. And (3) feeding the clarified ammonium molybdate wastewater subjected to gravity settling separation into a reaction barrel II, and adding a medicament II (sodium carbonate or sodium hydroxide) into the reaction barrel II to remove impurity cations except main cations in the ammonium molybdate wastewater by using the chemical precipitation reaction principle. And (4) the wastewater after full reaction enters a solid-liquid separator II, and the precipitate generated by the reaction is removed by using a gravity settling method. And (3) feeding the clarified ammonium molybdate wastewater subjected to gravity settling separation into a reaction barrel III, and adding a medicament III (sodium sulfide) into the reaction barrel III to further remove trace dissolved impurity cations except main cations in the ammonium molybdate wastewater by utilizing the chemical precipitation reaction principle. And (3) the wastewater after full reaction enters a solid-liquid separator III, and the precipitate generated by the reaction is removed by using a gravity settling method. The clarified ammonium molybdate wastewater after gravity settling separation is lifted by a pump to enter a precision filter (the filtration precision is below 0.5 micron), and trace solid impurities contained in the ammonium molybdate wastewater are further removed. Through detection, the cation content of the effluent is as follows: mo is less than or equal to 0.5 mg/L; cu is less than or equal to 0.5 mg/L; fe is less than or equal to 0.1 mg/L; ca is less than or equal to 0.1 mg/L.
In the pretreatment step, the main cations: NH4 in ammonium salt+And free ammonia and sodium ions, the major anions: nitrate ion NO3 -(ii) a Adding barium nitrate to generate barium sulfate precipitate and barium molybdate precipitate, adding sodium carbonate to generate calcium carbonate, magnesium hydroxide, iron carbonate, copper carbonate and other precipitates, adding sodium sulfide to sulfurize to further remove trace amount of dissolved Cu in waste water+And (3) cationic ions, the adding amount of the medicament: added according to 1.2 times of the molar mass of the ions to be removed in the wastewater.
b. Ammonium molybdate wastewater deamination procedure: after the pretreatment procedure, the wastewater enters a deamination wastewater pool, liquid alkali is added into the deamination wastewater pool for pH adjustment, after the pH of the ammonium molybdate wastewater is adjusted to about 12, the ammonium molybdate wastewater is lifted by a pump, exchanges heat with tower kettle outlet water, enters a deamination tower, passes through the deamination tower, and then the content of ammonia nitrogen in tower kettle outlet water is less than or equal to 10 mg/L; the tower top ammonia-containing steam is condensed and absorbed by a condenser and an ammonia water preparation skid block to prepare ammonia water, ammonia water with different concentrations can be prepared by controlling the temperature and the water adding amount, and the mass concentration range of the ammonia water is 5-25%. And adjusting to prepare the corresponding ammonia water concentration according to the ammonia water concentration required by the front-end process of ammonium molybdate production.
c. And (3) an ammonium molybdate wastewater evaporation process: after the deamination process, the wastewater enters an evaporation water tank, the pH of the wastewater is adjusted to below 7, then the wastewater is lifted by a pump to exchange heat with two-effect condensed water, then the wastewater exchanges heat with one-effect condensed water and enters an MVR falling film evaporator, the wastewater evaporated and concentrated by the MVR falling film evaporator is lifted by the pump to enter a two-effect forced circulation evaporator, the wastewater evaporated and concentrated by the two-effect forced circulation evaporator is lifted by the pump to enter a one-effect forced circulation evaporator, the wastewater evaporated and concentrated by the one-effect forced circulation evaporator is lifted by the pump to enter a vacuum crystallizer, the wastewater is crystallized in the vacuum crystallizer, and then the wastewater is lifted by the pump to a thickener, a centrifuge, a dryer and a packaging machine in sequence to prepare finished nitrate; raw steam (fresh steam) firstly enters a first-effect forced circulation heating chamber to be heated, then condensed water returns to a boiler room after heat exchange, secondary steam generated by a first-effect forced circulation evaporation chamber is sent to a heating chamber of a second-effect forced circulation evaporator to be used as a heat source to heat the heating chamber, then the condensed water enters a raw condensed water tank, the secondary steam generated by the evaporation chamber of the second-effect forced circulation evaporator is condensed and vacuumized, the condensed water enters a condensed water tank, the secondary steam generated by an evaporation chamber of an MVR falling-film evaporator enters an MVR compressor to be used as the heat source of the MVR heating chamber after being compressed and heated, the condensed water enters the condensed water tank, and water in the condensed water tank is conveyed back to an ammonium molybdate production process for recycling or other purposes after heat exchange.
The first-effect forced evaporator and the second-effect forced evaporator described in the above description or the accompanying drawings are all forced circulation evaporators, each forced circulation evaporator includes a heating chamber and a separation chamber (also called as an evaporation chamber), after entering the separation chamber, the material enters a forced circulation pump through the separation chamber, after being lifted by the forced circulation pump, the material enters the heating chamber, after being heated in the heating chamber, the material is changed into a boiling gas-liquid two-phase state, the material in the gas-liquid two-phase state after being heated in the heating chamber enters the separation chamber for gas-liquid separation, then the liquid phase enters the forced circulation pump again to repeat the above steps in sequence, and after the concentration reaches a certain degree, the material is lifted by a material transfer pump and discharged to a.
Although the present invention has been described in detail with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A process method for recycling and treating waste water containing ammonium molybdate is characterized by comprising the following steps: the method comprises the following steps:
a. ammonium molybdate wastewater pretreatment: lifting the wastewater from a wastewater pool to a reaction barrel I, adding a reagent I into the reaction barrel I, removing impurity anions except main anions in the wastewater, feeding the fully reacted wastewater into a solid-liquid separator I, removing precipitates generated by the reaction by using a gravity settling method, feeding clarified wastewater subjected to gravity settling separation into a reaction barrel II, adding a reagent II into the reaction barrel II, removing impurity cations except main cations in the wastewater, feeding the fully reacted wastewater into a solid-liquid separator II, removing precipitates generated by the reaction by using a gravity settling method, feeding the clarified wastewater subjected to gravity settling separation into a reaction barrel III, adding a reagent III into the reaction barrel III, further removing impurity cations except main cations dissolved in a trace amount in the wastewater, feeding the fully reacted wastewater into a solid-liquid separator III, removing the precipitates generated by the reaction by using a gravity settling method, the clarified wastewater after gravity settling separation is lifted by a pump to enter a precision filter, and trace solid impurities contained in the wastewater are further removed; the medicament I is barium nitrate, the medicament II is sodium carbonate or sodium hydroxide, and the medicament III is sodium sulfide;
b. ammonium molybdate wastewater deamination procedure: after the pretreatment procedure, the wastewater enters a deamination wastewater pool, liquid alkali is added into the deamination wastewater pool to adjust the pH of the wastewater to 11-12, the wastewater is lifted to exchange heat with the effluent of a tower kettle, then enters a deamination tower, passes through the deamination tower and then the effluent of the tower kettle is sent to an evaporation procedure, and ammonia-containing steam at the tower top is condensed and absorbed by a condenser and an ammonia water preparation pry block to prepare ammonia water;
c. and (3) an ammonium molybdate wastewater evaporation process: after the deamination process, the wastewater enters an evaporation water tank, the pH of the wastewater is firstly adjusted to be below 7, then the wastewater is lifted to exchange heat with secondary effect condensed water, then the wastewater exchanges heat with primary effect condensed water and enters an MVR falling film evaporator, the wastewater of the MVR falling film evaporator is lifted to enter a secondary effect forced evaporator, the wastewater of the secondary effect forced evaporator is lifted to enter a primary effect forced evaporator, the wastewater of the primary effect forced evaporator is lifted to enter a vacuum crystallizer, the wastewater is crystallized in the vacuum crystallizer, and then the wastewater is lifted to a thickener, a centrifugal machine, a drying machine and a packaging machine in sequence to prepare finished nitrate; raw steam firstly enters a heating chamber of a first-effect forced evaporator to be heated, then condensed water returns to a boiler room after heat exchange, secondary steam generated by a separation chamber of the first-effect forced evaporator is sent to a heating chamber of a second-effect forced circulation evaporator to be used as a heat source to heat the first-effect forced circulation evaporator, then the condensed water enters a raw condensed water tank, the secondary steam generated by the separation chamber of the second-effect forced evaporator is condensed and vacuumized, the condensed water enters a condensed water tank, the secondary steam generated by a separation chamber of an MVR falling-film evaporator enters an MVR compressor to be used as the heat source of the MVR heating chamber after being compressed and heated, the condensed water enters the condensed water tank, and water in the condensed water tank is conveyed back to an ammonium molybdate production process for recycling or other purposes.
2. The process method for recycling and treating the wastewater containing ammonium molybdate according to claim 1, which is characterized in that: the precision filter in the step a is a precision filter with the filtering precision of less than 0.5 micron.
3. The process method for recycling and treating the wastewater containing ammonium molybdate according to claim 1, which is characterized in that: the cation content of the effluent after the ammonium molybdate wastewater deamination procedure treatment in the step a is as follows: mo is less than or equal to 0.5 mg/L; cu is less than or equal to 0.5 mg/L; fe is less than or equal to 0.1 mg/L; ca is less than or equal to 0.1 mg/L.
4. The process method for recycling and treating the wastewater containing ammonium molybdate according to claim 1, which is characterized in that: and c, in the step b, the ammonia nitrogen content of the water discharged from the tower bottom of the deamination tower in the deamination procedure of the ammonium molybdate wastewater is less than or equal to 10 mg/L.
5. The resource recycling treatment process method for ammonium molybdate wastewater as claimed in claim 1, which is characterized in that: and c, the concentration of the prepared ammonia water in the ammonium molybdate wastewater deamination procedure in the step b can be adjusted within the range of 5-25%.
Priority Applications (1)
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