CN104528855A - Evaporation concentration method of molybdenum precipitation wastewater - Google Patents

Evaporation concentration method of molybdenum precipitation wastewater Download PDF

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Publication number
CN104528855A
CN104528855A CN201410755657.9A CN201410755657A CN104528855A CN 104528855 A CN104528855 A CN 104528855A CN 201410755657 A CN201410755657 A CN 201410755657A CN 104528855 A CN104528855 A CN 104528855A
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China
Prior art keywords
vanadium wastewater
wastewater
evaporation
vanadium
evaporating
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CN201410755657.9A
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CN104528855B (en
Inventor
刘学文
邓孝伯
黄锦宁
冉俊
江洪兵
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Pangang Group Panzhihua Steel and Vanadium Co Ltd
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Pangang Group Panzhihua Steel and Vanadium Co Ltd
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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
    • 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
    • C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
    • 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
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32

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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)
  • Heat Treatment Of Water, Waste Water Or Sewage (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

The invention discloses an evaporation concentration method of molybdenum precipitation wastewater and relates to a wastewater treatment method. The invention provides an evaporation concentration method of molybdenum precipitation wastewater, which can be used for saving the cost and helping to protect the environment. The evaporation concentration method of molybdenum precipitation wastewater comprises the following steps: A. primarily evaporating the molybdenum precipitation wastewater in a wastewater evaporation tank; B. pre-treating the molybdenum precipitation wastewater to make the molybdenum precipitation wastewater be alkaline; C. evaporating the molybdenum precipitation wastewater in a multi-effect evaporator, wherein the evaporation heating source is afterheat generated in a vanadium oxide production process. According to the invention, the afterheat generated in the vanadium oxide production process is used as the heat source of multi-effect evaporation of the molybdenum precipitation wastewater, thereby reducing the gas application amount in the evaporation of the molybdenum precipitation wastewater, saving resources and reducing the cost; moreover, environmental pollution caused by direct emission of the afterheat generated in the vanadium oxide production process is avoided.

Description

Vanadium wastewater evaporating concentrating method
Technical field
The present invention relates to a kind of method of wastewater treatment, particularly relate to the evaporating concentrating method of the vanadium wastewater produced in a kind of vanadium oxides producing process
Background technology
In vanadium oxides producing process, because roasting, fusing, reduction and precipitation can produce a large amount of used heat, there is considerable influence to environment and production cost.Current domestic vanadium oxide manufacturing enterprise does not take recovery measure substantially to used heat.
The vanadium wastewater that vanadium oxide produces in producing realizes cycling utilization of wastewater after using heated by gas multiple-effect evaporation concentrated, and used heat directly discharges, and not only causes the waste of thermal source, and adds production cost and environmental protection risk.
Summary of the invention
The technical problem to be solved in the present invention is: provide one can cost-saving and environmentally friendly vanadium wastewater evaporating concentrating method.
In order to solve the problem, the technical scheme adopted is: vanadium wastewater evaporating concentrating method comprises the steps:
A, vanadium wastewater enter waste water evaporating pot and carry out pre-evaporation;
B, carry out vanadium wastewater pre-treatment, make vanadium wastewater be alkalescence;
C, vanadium wastewater enter multiple-effect evaporator and evaporate, and the heat source of evaporation is the waste heat in vanadium oxides producing process.
Further: the waste heat in vanadium oxides producing process be roasting process produce high-temperature flue gas, reduction process produce high-temperature flue gas and melting process produce high-temperature flue gas in one or more.
Further: the high-temperature flue gas that reduction process produces is that reduction kiln heating high-temperature flue gas and reduction kiln reduce remaining coal gas.
Further: the delivery of steam produced by vanadium wastewater pre-evaporation in waste water evaporating pot is to last evaporator, and this steam evaporates thermal source as end effect.
Further: the evaporation of vanadium wastewater end effect advances into solid-liquid separation tank and carries out solid-liquid separation, and the dope after solid-liquid separation enters last evaporator and carries out end effect evaporation.
Further: vacuumize in last evaporator, by normal atmosphere, the dope after solid-liquid separation is pressed into last evaporator.
Further: the pipeline of connection solid-liquid separation tank and last evaporator is provided with variable valve, the liquid level of the dope in governor valve control last evaporator after solid-liquid separation.
Further: the temperature entering the vanadium wastewater of waste water evaporating pot is not less than 50 DEG C.
Further: waste water evaporating pot is through antiseptic evaporating pot.
The invention has the beneficial effects as follows: the present invention utilizes the waste heat in vanadium oxides producing process as the thermal source of vanadium wastewater multiple-effect evaporation; Decrease the coal gas usage quantity in vanadium wastewater evaporation, saved resource, reduced cost; And the waste heat avoided in vanadium oxides producing process directly discharges the pollution to environment.
Make vanadium wastewater enter waste water evaporating pot in advance and carry out pre-evaporation, reduce the treatment temp of vanadium wastewater in subsequent handling, delayed equipment corrosion speed, improve worker's operating environment.
In acid before vanadium wastewater process, easy etching apparatus.Carry out vanadium wastewater pre-treatment to before multiple-effect evaporation, make vanadium wastewater be alkalescence, equipment corrosion speed can be delayed equally.
Accompanying drawing explanation
Fig. 1 is vanadium wastewater evaporating concentrating method schema;
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further described.
Vanadium wastewater evaporating concentrating method comprises the steps:
A, vanadium wastewater enter waste water evaporating pot and carry out pre-evaporation;
B, carry out vanadium wastewater pre-treatment, make vanadium wastewater be alkalescence;
C, vanadium wastewater enter multiple-effect evaporator and evaporate, and the heat source of evaporation is the waste heat in vanadium oxides producing process.
Wherein, the waste heat in vanadium oxides producing process be roasting process produce high-temperature flue gas, reduction process produce high-temperature flue gas and melting process produce high-temperature flue gas in one or more.The high-temperature flue gas that reduction process produces is that reduction kiln heating high-temperature flue gas and reduction kiln reduce remaining coal gas.
Utilize the waste heat in vanadium oxides producing process as the thermal source of vanadium wastewater multiple-effect evaporation; Decrease the coal gas usage quantity in vanadium wastewater evaporation, saved resource, reduced cost; And the waste heat avoided in vanadium oxides producing process directly discharges the pollution to environment.
Make vanadium wastewater enter waste water evaporating pot in advance and carry out pre-evaporation, reduce the treatment temp of vanadium wastewater in subsequent handling, delayed equipment corrosion speed, improve worker's operating environment.
In acid before vanadium wastewater process, easy etching apparatus.Carry out vanadium wastewater pre-treatment to before multiple-effect evaporation, make vanadium wastewater be alkalescence, equipment corrosion speed can be delayed equally.
Vanadium wastewater in waste water evaporating pot is in acid, and in order to delay waste water evaporating pot corrosion speed, waste water evaporating pot is through antiseptic evaporating pot.
In order to utilize existing heat further, save energy, the delivery of steam that vanadium wastewater pre-evaporation in waste water evaporating pot produces by the present invention is to last evaporator, and this steam evaporates thermal source as end effect.
Further, vanadium wastewater end effect evaporation of the present invention advances into solid-liquid separation tank and carries out solid-liquid separation, and the dope after solid-liquid separation enters last evaporator and carries out end effect evaporation.Salt in solid-liquid separation tank in vanadium wastewater and other substance crystallization or Precipitation, reduce the content of vanadium wastewater inner salt and other material, be conducive to further concentration and evaporation.
Dope in solid-liquid separation tank after vanadium wastewater solid-liquid separation can enter last evaporator by the mode of pump delivery, but which easily makes system jams.Therefore vacuumize in last evaporator of the present invention, by normal atmosphere by the dope press-in last evaporator after solid-liquid separation.Evaporation concentration dope returns the end effect evaporation phase by vacuum, reduces system jams risk, decreases worker's labour intensity.Variable valve can be provided with, the liquid level of the dope in governor valve control last evaporator after solid-liquid separation on the pipeline connecting solid-liquid separation tank and last evaporator.Such dope enters last evaporator by the liquid automatic control of variable valve according to dope, not influential system vacuum tightness.
In order to ensure evaporation concentration effect, reduce evaporation concentration institute heat requirement, the temperature entering the vanadium wastewater of waste water evaporating pot is not less than 50 DEG C.
Embodiment 1
By temperature 90 DEG C, flow 15m 3the vanadium wastewater of/h enters evaporation concentration system waste water evaporating pot, and after evaporation, temperature reduces to 60 DEG C, and evaporation concentration system mixed gas flow is 1600m 3/ h, evaporation concentration system steam output is 18.5m 3/ h.
Embodiment 2
Be 350 DEG C by temperature, flow is 20000m 3enter evaporation concentration system after the baking flue gas of/h heats waste water, flue-gas temperature is down to 150 DEG C, and evaporation concentration system mixed gas flow is 1550m 3/ h, evaporation concentration system steam output is 18m 3/ h.
Embodiment 3
Be 700 DEG C by temperature, flow is 2000m 3the reduction kiln of/h adds after heat smoke heats waste water and enters evaporation concentration system, and flue-gas temperature is down to 150 DEG C, and evaporation concentration system mixed gas flow is 1650m 3/ h, evaporation concentration system steam output is 18m 3/ h.
Embodiment 4
Enter evaporation concentration system, flue-gas temperature 150 DEG C after only using coal gas to heat waste water, evaporation concentration system mixed gas flow is 1800m 3/ h, evaporation concentration system steam output is 18m 3/ h, dope returns into triple effect by pump, and the system normal cycle of operation is 60 days.

Claims (9)

1. vanadium wastewater evaporating concentrating method, is characterized in that: comprise the steps:
A, vanadium wastewater enter waste water evaporating pot and carry out pre-evaporation;
B, carry out vanadium wastewater pre-treatment, make vanadium wastewater be alkalescence;
C, vanadium wastewater enter multiple-effect evaporator and evaporate, and the heat source of evaporation is the waste heat in vanadium oxides producing process.
2. vanadium wastewater evaporating concentrating method according to claim 1, is characterized in that: the waste heat in vanadium oxides producing process be roasting process produce high-temperature flue gas, reduction process produce high-temperature flue gas and melting process produce high-temperature flue gas in one or more.
3. vanadium wastewater evaporating concentrating method according to claim 1, is characterized in that: the high-temperature flue gas that reduction process produces is that reduction kiln heating high-temperature flue gas and reduction kiln reduce remaining coal gas.
4. the vanadium wastewater evaporating concentrating method according to any one of claims 1 to 3, is characterized in that: the delivery of steam produced by vanadium wastewater pre-evaporation in waste water evaporating pot is to last evaporator, and this steam evaporates thermal source as end effect.
5. vanadium wastewater evaporating concentrating method according to claim 4, is characterized in that: the evaporation of vanadium wastewater end effect advances into solid-liquid separation tank and carries out solid-liquid separation, and the dope after solid-liquid separation enters last evaporator and carries out end effect evaporation.
6. vanadium wastewater evaporating concentrating method according to claim 5, is characterized in that: vacuumize in last evaporator, by normal atmosphere by the dope press-in last evaporator after solid-liquid separation.
7. vanadium wastewater evaporating concentrating method according to claim 6, is characterized in that: the pipeline of connection solid-liquid separation tank and last evaporator is provided with variable valve, the liquid level of the dope in governor valve control last evaporator after solid-liquid separation.
8. vanadium wastewater evaporating concentrating method according to claim 7, is characterized in that: the temperature entering the vanadium wastewater of waste water evaporating pot is not less than 50 DEG C.
9. vanadium wastewater evaporating concentrating method according to claim 8, is characterized in that: waste water evaporating pot is through antiseptic evaporating pot.
CN201410755657.9A 2014-12-10 2014-12-10 Evaporation concentration method of molybdenum precipitation wastewater Active CN104528855B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106904776A (en) * 2015-12-23 2017-06-30 哈尔滨工大金涛科技股份有限公司 Roasting process for extracting vanadium wastewater treatment equipment
CN108325227A (en) * 2018-04-10 2018-07-27 上海优华系统集成技术股份有限公司 A kind of system and its processing method to heat recovery and utilization in multi-effect evaporation system
CN111704303A (en) * 2020-07-09 2020-09-25 攀枝花学院 Drying method of evaporation crystallization liquid of vanadium precipitation wastewater and method for recycling sodium sulfide

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002166244A (en) * 2000-11-30 2002-06-11 Taiheiyo Cement Corp Method for treating petroleum combustion ash
CN102502900A (en) * 2011-11-02 2012-06-20 攀钢集团研究院有限公司 Treatment method of sodium-roasted-leached-acid ammonium salt vanadium precipitation waste water
CN102531081A (en) * 2010-12-15 2012-07-04 张广林 Method for treating wastewater from vanadium plant by using waste gas from roasting furnace

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002166244A (en) * 2000-11-30 2002-06-11 Taiheiyo Cement Corp Method for treating petroleum combustion ash
CN102531081A (en) * 2010-12-15 2012-07-04 张广林 Method for treating wastewater from vanadium plant by using waste gas from roasting furnace
CN102502900A (en) * 2011-11-02 2012-06-20 攀钢集团研究院有限公司 Treatment method of sodium-roasted-leached-acid ammonium salt vanadium precipitation waste water

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Title
钱友顺: "蒸氨—浓缩工艺处理沉钒废水的工程应用", 《给水排水》 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106904776A (en) * 2015-12-23 2017-06-30 哈尔滨工大金涛科技股份有限公司 Roasting process for extracting vanadium wastewater treatment equipment
CN108325227A (en) * 2018-04-10 2018-07-27 上海优华系统集成技术股份有限公司 A kind of system and its processing method to heat recovery and utilization in multi-effect evaporation system
CN108325227B (en) * 2018-04-10 2024-04-16 上海优华系统集成技术股份有限公司 System for recycling heat in multi-effect evaporation system and treatment method thereof
CN111704303A (en) * 2020-07-09 2020-09-25 攀枝花学院 Drying method of evaporation crystallization liquid of vanadium precipitation wastewater and method for recycling sodium sulfide
CN111704303B (en) * 2020-07-09 2022-06-21 攀枝花学院 Drying method of evaporation crystallization liquid of vanadium precipitation wastewater and method for recycling sodium sulfide

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