CN206940522U - A kind of processing system of magnesia FGD liquid - Google Patents

A kind of processing system of magnesia FGD liquid Download PDF

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Publication number
CN206940522U
CN206940522U CN201720819739.4U CN201720819739U CN206940522U CN 206940522 U CN206940522 U CN 206940522U CN 201720819739 U CN201720819739 U CN 201720819739U CN 206940522 U CN206940522 U CN 206940522U
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liquid
gas
neutralization reactor
sulfate
neutralizer
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CN201720819739.4U
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刘玉强
路八智
瞿尚君
马旻锐
饶栋
姚玉婷
李雪栋
刘陈
李燕梅
张学欢
王宗磊
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Jinchuan Group Co Ltd
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Jinchuan Group Co Ltd
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Abstract

The utility model is a kind of processing system of magnesia FGD liquid, and using the acid waste water clear liquid of sulphuric acid process China and foreign countries row, neutralization reaction is carried out with magnesia FGD liquid.Magnesium sulfite in dilute sulfuric acid in acid waste water, with magnesia FGD liquid is reacted, and is generated stable magnesium sulfate, is overflowed SO2.Neutralizer is through SO2Degassing tower removes SO2Afterwards, the clear liquid reuse after press filtration cleans uses to sulfate system as supplement water.The SO of removing2Gas returns to sulfate system production sulfuric acid.The insoluble matter in the poisonous, harmful heavy metal and magnesia in magnesia FGD liquid has been efficiently separated out, while has reduced the treating capacity and operating cost of acid waste water, has largely reclaimed SO2Gas carries out relieving haperacidity, and recycle in magnesia and deaerate moisturizing of the clear liquid as sulfate system, adds the utilization rate of water resource, the treatment of wastes with processes of wastes against one another, economic benefit, obvious environment benefit.

Description

A kind of processing system of magnesia FGD liquid
Technical field
The utility model belongs to smelting, chemical field, is related to one kind and reclaims sulfur dioxide gas from magnesia FGD liquid, Reduce and the method that acid waste water improves water utilization rate is arranged outside sulfate system.
Background technology
SO in flue gas during smelting2During producing sulfuric acid, sulfate system can produce substantial amounts of acid waste water, it is necessary to fixed Phase discharged, processing up to standard, and simultaneity factor also needs to constantly supplement new water.
In the smelting process of sulphide ore, it can usually produce and largely contain SO2Flue gas during smelting, surrounding enviroment are caused seriously Pollution.SO in low concentration flue gas during smelting at present2Processing method it is more, advantage and disadvantage are different, and Wet Flue Gas Desulfurization Technology is because of it Desulfuration efficiency is high, it is good to the adaptability of flue gas and desulfurizing agent the advantages that, it is most widely used, mainly including magnesium processes, calcium method, sodium method etc..
In application magnesium processes desulfurization technology, to realize that desulfuration efficiency is higher, economy is more preferable, industry is generally by desulfurization by-product Thing magnesium sulfite is processed further handling, main to include production sulfuric acid magnesium products, magnesium sulfite, magnesium sulfate disintegrating and regeneration, Magnesia circulation desulfurization etc..During sulphide ore flue gas during smelting is handled, as desulfurizing agent magnesia is to SO2The continuous suction of flue gas Receive, poisonous, the harmful heavy metal in flue gas during smelting will be progressively enriched with doctor solution, will directly affect desulfurizing byproduct sulfurous The back-end processing of sour magnesium, is unable to reach Expected Results.
Utility model content
The purpose of this utility model recycles magnesium sulfite technique, Wu Fayou aiming at using conventional oxidation magnesium doctor solution Effect eliminates the poisonous, harmful heavy metal being enriched in doctor solution to the deficiency of the back-end processing of magnesium sulfite, proposes a kind of utilize The acid waste water processing magnesia FGD liquid of sulphuric acid process China and foreign countries row, reclaims SO2The treatment of wastes with processes of wastes against one another method of gas.
The technical solution adopted in the utility model is:A kind of processing system of magnesia FGD liquid, in its processing procedure Equipment includes:It is doctor solution conveyance conduit, diluted acid conveyance conduit, neutralization reactor, neutralizer delivery pump, return duct, degassing tower, de- Gas delivery pump and plate and frame filter press;Doctor solution conveyance conduit and diluted acid conveyance conduit as equipment for liquid transportation, respectively with neutralization Reactor is connected;The neutralization reactor is confined reaction device, including reactor tank body, agitating device, deaeration pipe, backflow Pipe, return valve, liquid level gauge, neutralization reactor are provided with agitating device, and deaeration pipe, return duct are at the top of neutralization reactor, liquid level gauge Liquid level in neutralization reactor is detected, neutralization reactor bottom is connected by pipeline with neutralizer delivery pump;The deaeration pipe is with taking off The gas outlet tube of gas tower is connected, and return duct one end is connected to neutralizer delivery pump, and one end is connected to neutralization reactor, and return valve is located at On return duct;Degassing tower includes tower body, spray equipment, mist eliminating layer, air inlet and gas outlet tube, during degassing tower top is set With liquid feed tube, two layers of spray equipment is set from top to bottom inside degassing tower;The gas outlet tube is connected to sulfate system flue gas Pipe network produces sulfuric acid, and degassing tower bottom is connected by pipeline with de- gas-liquid delivering pump, by pipeline to plate and frame filter press;The plate Frame filter press clear liquid reuse is to sulfate system moisturizing pipeline;
Technological process includes:Respectively by whole magnesia FGD liquid and row's acid waste water sulfuric acid purification outside sulfate system System is used to be clear liquids of the 3-5% or so after suspension filter to the circulation diluted acid acidity of relieving haperacidity flue gas cool-down, dedusting, by certain Ratio is delivered to neutralization reactor by doctor solution conveyance conduit and diluted acid conveyance conduit, generates and contains in the presence of agitating device MgSO4Solution and SO2The neutralizer of gas, the part SO that neutralization reaction is overflowed2The gas that the degassed pipe of gas is incorporated to degassing tower goes out Mouth pipe, by SO2Gas delivers to sulfate system flue gas pipe network in the lump, and reacted neutralizer is delivered to degassing by neutralizer delivery pump Tower is de-gassed;Return valve and liquid level gauge interlock, and adjust the liquid level of neutralization reactor, when neutralization reactor liquid level reaches high limit, Return valve is closed, when neutralization reactor liquid level reaches lower bound, opening return valve;In degassing tower, complete neutralizer is reacted certainly It is above lower to be contacted by two layers of spray equipment with the air inversion that the air inlet of degassing tower bottom enters, the SO of dissolving2Gas Body through delivering to sulfate system flue gas pipe network by the gas outlet tube of degassing tower after mist eliminating layer mist eliminating by being used for relieving haperacidity;After degassing The degassed liquid delivery pump of neutralizer is delivered to plate and frame filter press, and plate and frame filter press is pressed the insoluble impurities in neutralizer Filter, supernatant fraction deliver to sulfate system as supplement water.
Reaction principle is:Reacted using the magnesium sulfite in the dilute sulfuric acid in acid waste water, with magnesia FGD liquid, Generate stable magnesium sulfate, removing recovery SO2Gas is used for sulfuric acid production system, reaches the purpose of the treatment of wastes with processes of wastes against one another.
Further, the neutralizer delivery pump, de- gas-liquid delivering pump are parallel with a stand-by pump.
The spray equipment has two layers.
The return valve interlocks with liquid level gauge, adjusts the liquid level of neutralization reactor.
The beneficial effects of the utility model are:Using sulphuric acid process China and foreign countries acid discharge wastewater treatment magnesia FGD Liquid, reclaim SO2Gas, significant effect.Efficiently separate out in the poisonous, harmful heavy metal and magnesia in magnesia FGD liquid Insoluble matter, while reduce the treating capacity and operating cost of acid waste water, largely reclaimed SO2Gas carries out relieving haperacidity, circulation Moisturizing by the use of in magnesia with degassing clear liquid as sulfate system, add the utilization rate of water resource, the treatment of wastes with processes of wastes against one another, economy effect Benefit, obvious environment benefit.
Brief description of the drawings
Fig. 1 is apparatus and process flow chart of the present utility model;
In figure, 1- doctor solution conveyance conduits;2- diluted acid conveyance conduits;3- desulfurization flow meters;4- diluted acid flowmeters;In 5- And reactor;6- reactor tank bodies;7- agitating devices;8- deaeration pipes;9- neutralizer delivery pumps;10- liquid level gauges;11- return ducts; 12- return valves;13- neutralizer feed tubes;14- degassing towers;15- tower bodies;16- spray equipments;17- mist eliminating layers;18- air inlets Mouthful;19- gas outlet tubes;20-take off gas-liquid delivering pump;21-plate and frame filter press.
Embodiment
It is described with reference to the drawings and the technical solution of the utility model is described further.
As illustrated, a kind of processing system of magnesia FGD liquid, the equipment in its processing procedure includes:Doctor solution conveys Pipeline 1, diluted acid conveyance conduit 2, neutralization reactor 5, neutralizer delivery pump 9, return duct 11, degassing tower 14, degassing delivery pump 20 And plate and frame filter press 21;Doctor solution conveyance conduit 1 and diluted acid conveyance conduit 2 are used as equipment for liquid transportation, respectively with neutralization reaction Device 5 is connected;The neutralization reactor 5 is confined reaction device, including reactor tank body 6, agitating device 7, deaeration pipe 8, backflow Pipe 11, return valve 12, liquid level gauge 10, neutralization reactor 5 are provided with agitating device 7, and deaeration pipe 8, return duct 11 are in neutralization reactor 5 Top, liquid level gauge 10 detect liquid level in neutralization reactor 5, and the bottom of neutralization reactor 5 passes through pipeline and the phase of neutralizer delivery pump 9 Even;The deaeration pipe 8 is connected with the gas outlet tube 19 of degassing tower 14, and the one end of return duct 11 is connected to neutralizer delivery pump 9, one end Neutralization reactor 5 is connected to, return valve 12 is located on return duct 11;Degassing tower 14 includes tower body 15, spray equipment 16, mist eliminating layer 17th, air inlet 18 and gas outlet tube 19, the top of degassing tower 14 set neutralizer feed tube 13, inside degassing tower 14 from upper and Two layers of spray equipment 16 of lower setting;The gas outlet tube 19 is connected to sulfate system flue gas pipe network, and the bottom of degassing tower 14 is by pipeline It is connected with de- gas-liquid delivering pump 20, by pipeline to plate and frame filter press 21;The clear liquid reuse of plate and frame filter press 21 is to sulfuric acid System water supplement pipeline;
Technological process includes:Acid waste water is arranged by whole magnesia FGD liquid and outside sulfate system respectively, by certain Ratio is delivered to neutralization reactor 5 by doctor solution conveyance conduit 1 and diluted acid conveyance conduit 2, raw in the presence of agitating device 7 Into containing MgSO4Solution and SO2The neutralizer of gas, the part SO that neutralization reaction is overflowed2The degassed pipe 8 of gas is incorporated to degassing tower Gas outlet tube 19, by SO2Gas delivers to sulfate system flue gas pipe network in the lump, and reacted neutralizer is by neutralizer delivery pump 9 Degassing tower 14 is delivered to be de-gassed;Return valve 12 interlocks with liquid level gauge 10, adjusts the liquid level of neutralization reactor 5, anti-when neutralizing The liquid level of device 5 is answered to reach high limit, return valve 12 is closed, when the liquid level of neutralization reactor 5 reaches lower bound, opening return valve 12;Deaerating In tower 14, react that complete neutralizer passes through two layers of spray equipment 16 and the air inlet 18 of degassing tower bottom enters The air inversion contact entered, the SO of dissolving2Gas is sent by being passed through after the mist eliminating of mist eliminating layer 17 by the gas outlet tube 19 of degassing tower 14 It is used for relieving haperacidity to sulfate system flue gas pipe network;The degassed liquid delivery pump 20 of neutralizer after degassing is delivered to plate and frame filter press 21, Insoluble impurities in neutralizer is carried out press filtration by plate and frame filter press 21, and supernatant fraction delivers to sulfate system as supplement water.
The neutralizer delivery pump 9, de- gas-liquid delivering pump 20 stand-by pump all in parallel, it can not only be used for standby and can double pump Open simultaneously, enlargement discharge.
The utility model method neutralizes the magnesia FGD liquid from flue gas during smelting using row's acid waste water outside sulfate system, By the SO of generation2Gas delivers to sulfate system by demisting and is used for relieving haperacidity, produces Adlerika and flue gas during smelting is removed by filtration In after the impurity such as poisonous, harmful heavy metal for bringing into and insoluble matter, deliver to sulfate system as sulfuric acid relieving haperacidity moisturizing.We Method has both reclaimed SO2Gas, reduce the outer acid discharge wastewater treatment expense of sulfate system again, with water returning by neutralizer clear liquid With adding the utilization ratio of water resource.
Embodiment 1
Normal production, magnesia FGD slurry pH value are 5.5, and sodium sulfite content is about 20%, the outer acid discharge of sulfate system Waste water acidity is about 5%, and magnesia FGD slurries and acid waste water are pressed into 1:2.5 ratio passes through doctor solution conveyance conduit 2 and dilute Sour conveyance conduit 2 is delivered to neutralization reactor 5, reacts under agitation.Liquid level inside neutralization reactor 5 is by the basis of return valve 12 The interlocking of liquid level gauge 10 is adjusted, when the liquid level of neutralization reactor 5 reaches high limit, closing volume valve 12, when neutralization reactor liquid level Reach lower bound, open return valve refluxing portion neutralizer;React the part SO overflowed2Gas is incorporated to sulfate system by deaeration pipe 8 Flue gas pipe network, neutralizer are delivered to degassing tower 14 by neutralizer delivery pump 9.Complete neutralizer is reacted to pass through two layers The air inversion that spray equipment 16 enters with degassing tower lower air air inlet 18 contacts, the SO of abjection2Gas passes through mist eliminating layer After 17 mist eliminatings, the production relieving haperacidity of sulfate system flue gas pipe network is delivered to via degassing tower gas outlet tube 19;Neutralizer warp after degassing De- gas-liquid delivering pump 20 is delivered to plate and frame filter press 21, and the insoluble impurities in neutralizer is carried out press filtration by plate and frame filter press, clearly Sulfate system is delivered to as supplement water in liquid part.
Embodiment 2
Normal production, magnesia FGD slurry pH value are 5.5, and sodium sulfite content is about 18%, the outer acid discharge of sulfate system Waste water acidity is about 5%, and magnesia FGD slurries and acid waste water are pressed into 1:2.1 ratio passes through doctor solution conveyance conduit 2 and dilute Sour conveyance conduit 2 is delivered to neutralization reactor 5, reacts under agitation.Liquid level inside neutralization reactor 5 is by the basis of return valve 12 The interlocking of liquid level gauge 10 is adjusted, when the liquid level of neutralization reactor 5 reaches high limit, closing volume valve 12, when neutralization reactor liquid level Reach lower bound, open return valve refluxing portion neutralizer;React the part SO overflowed2Gas is incorporated to sulfate system by deaeration pipe 8 Flue gas pipe network, neutralizer are delivered to degassing tower 14 by neutralizer delivery pump 9.Complete neutralizer is reacted to pass through two layers The air inversion that spray equipment 16 enters with degassing tower lower air air inlet 18 contacts, the SO of abjection2Gas passes through mist eliminating layer After 17 mist eliminatings, the production relieving haperacidity of sulfate system flue gas pipe network is delivered to via degassing tower gas outlet tube 19;Neutralizer warp after degassing De- gas-liquid delivering pump 20 is delivered to plate and frame filter press 21, and the insoluble impurities in neutralizer is carried out press filtration by plate and frame filter press, clearly Sulfate system is delivered to as supplement water in liquid part.

Claims (4)

1. a kind of processing system of magnesia FGD liquid, it is characterized in that:Equipment in its processing procedure includes:Doctor solution delivery pipe Road(1), diluted acid conveyance conduit(2), neutralization reactor(5), neutralizer delivery pump(9), return duct(11), degassing tower(14), it is de- Gas delivery pump(20)And plate and frame filter press(21);Doctor solution conveyance conduit(1)With diluted acid conveyance conduit(2)Set as liquid conveying It is standby, respectively with neutralization reactor(5)It is connected;The neutralization reactor(5)For confined reaction device, including reactor tank body(6)、 Agitating device(7), deaeration pipe(8), return duct(11), return valve(12), liquid level gauge(10), neutralization reactor(5)Provided with stirring Device(7), deaeration pipe(8), return duct(11)In neutralization reactor(5)Top, liquid level gauge(10)Detect neutralization reactor(5)It is interior Liquid level, neutralization reactor(5)Bottom passes through pipeline and neutralizer delivery pump(9)It is connected;The deaeration pipe(8)With degassing tower(14) Gas outlet tube(19)It is connected, return duct(11)One end is connected to neutralizer delivery pump(9), one end is connected to neutralization reactor(5), Return valve(12)It is located at return duct(11)On;Degassing tower(14)Including tower body(15), spray equipment(16), mist eliminating layer(17), it is empty Gas air inlet(18)And gas outlet tube(19), degassing tower(14)Top sets neutralizer feed tube(13), degassing tower(14)It is internal Spray equipment is set from top to bottom(16);The gas outlet tube(19)It is connected to sulfate system flue gas pipe network, degassing tower(14)Bottom Portion is by pipeline and de- gas-liquid delivering pump(20)It is connected, by pipeline to plate and frame filter press(21);The plate and frame filter press(21) Clear liquid reuse is to sulfate system moisturizing pipeline.
2. a kind of processing system of magnesia FGD liquid according to claim 1, it is characterized in that:The neutralizer delivery pump (9), de- gas-liquid delivering pump(20)It is parallel with a stand-by pump.
3. a kind of processing system of magnesia FGD liquid according to claim 1, it is characterized in that:Spray equipment(16)Have two Layer.
4. a kind of processing system of magnesia FGD liquid according to claim 1, it is characterized in that:Return valve(12)With liquid level Meter(10)Interlocking, adjust neutralization reactor(5)Liquid level.
CN201720819739.4U 2017-07-07 2017-07-07 A kind of processing system of magnesia FGD liquid Active CN206940522U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201720819739.4U CN206940522U (en) 2017-07-07 2017-07-07 A kind of processing system of magnesia FGD liquid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201720819739.4U CN206940522U (en) 2017-07-07 2017-07-07 A kind of processing system of magnesia FGD liquid

Publications (1)

Publication Number Publication Date
CN206940522U true CN206940522U (en) 2018-01-30

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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