CN209721798U - A kind of device recycling magnesium in high magnesium desulfurization wastewater - Google Patents
A kind of device recycling magnesium in high magnesium desulfurization wastewater Download PDFInfo
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- CN209721798U CN209721798U CN201920250500.9U CN201920250500U CN209721798U CN 209721798 U CN209721798 U CN 209721798U CN 201920250500 U CN201920250500 U CN 201920250500U CN 209721798 U CN209721798 U CN 209721798U
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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
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Abstract
A kind of device recycling magnesium in high magnesium desulfurization wastewater includes desulfurizing tower, neutralization pond, magnesium recovery pond and aeration tank, the inlet of desulfurizing tower liquid outlet connection neutralization pond, the upper end outlet of neutralization pond connects magnesium recovery pond inlet, the discharge port of magnesium recovery pond bottom end connects magnesium precipitate pond, upper end liquid outlet connects aeration tank, desulfurizing tower exiting flue gas is blasted in aeration tank by air blower, it is aerated bottom of pond portion connection calcium carbonate and magnesium carbonate sedimentation basin, sediment in calcium carbonate and magnesium carbonate sedimentation basin is returned in the desulfurizing tower by lime stone pulping system, aeration tank supernatant outlet connects subsequent processing units.The utility model adjusts pH using Dual alkali and is aided with CO2The method that magnesium in high magnesium desulfurization wastewater is recycled in carbonization, while softening waste water, the sludge quantity of generation is less, and mud cake outward transport is made after plate and frame filter press filters pressing, and recycling is convenient, will not generate pollution to environment；The magnesium hydroxide products of high-purity, high value can be recovered to, cost for wastewater treatment is low.
Description
Technical field
The utility model relates to a kind of devices for recycling magnesium in high magnesium desulfurization wastewater, belong to waste water sofening treatment technology neck
Domain.
Background technique
With the development of world economy, freshwater resources lack the problem of become especially prominent, sustainable economic development
It is limited to shortage of water resources and water-quality deterioration.Water Demand for Thermal Power Plants accounts for the 30%-40% of industrial water consumption, whether water consumption
Or displacement is all very huge.In recent years, many countries have promulgated a series of water draining policy and regulations, for electricity at present
The draining of station-service water and water quality have more specific regulation, highlight the control to water pollution, to promotion water-use efficiency and subtract
Few blowdown proposes strict regulations, for draining rich and influential family with water as thermal power plant, need to carry out wastewater comprehensive treatment in time
Work, waste water is focused on, and forbids waste water outlet, and thermal power plant realizes that the key of waste water near-zero release is to realize desulfurization wastewater
Zero-emission.
Currently, limestone wet-process is the sulfur method that thermal power plant is mainly taken, but in " minimum discharge " transformation process
A large amount of desulfurization wastewaters can be generated.Contain a large amount of calcium and magnesium ion in waste water, has the characteristics that strong corrosive and easy fouling, cause
Disposal costs are high, and reuse is difficult, become the key factor for restricting power plant effluent " zero-emission ", therefore, reinforce softening desulfurization wastewater
The research of means is very in due course and necessary.
Calcium-magnesium content in desulfurization wastewater influenced by factors such as desulphurization system influent quality, lime stone kinds and fluctuate compared with
Greatly.When lime stone higher using magnesium content, the magnesium ion content in waste water will be higher.On the one hand, to subsequent wastewater treatment
Equipment is affected, and the high magnesium in slurries will form magnesium hydroxide, if cannot be discharged in time, can seriously affect subsequent embrane method processing
Flux, the selection of influence technique route.Content of magnesium height can also cause desulfurization slurry to blister, and then corrode flue, influence titanium dioxide
Sulphur absorbs, and makes gypsum dehydration effect difference etc.；On the other hand, if recycled to magnesium, also certain warp can be brought for power plant
Ji benefit.Magnesium hydroxide is widely used, is the excellent fire retardant of plastics, rubber product；It is used as flue gas desulfurization in environmental protection
Agent can replace the neutralizer of caustic soda and lime as acid-bearing wastewater；Oil dope is also acted as, anti-corrosion and desulfidation are played；
In addition, it may also be used for the purification of electronics industry, medicine, granulated sugar makees thermal insulation material and manufactures other magnesium salts products.
Currently, sofening treatment method of the magnesium hydroxide recycling using chemical dosing, often selection adds sodium carbonate, bicarbonate
The magnesium hydroxide purity of one or more of sodium, sodium hydroxide, calcium hydroxide, sodium sulphate and carbon dioxide, recycling is low, generates
A large amount of sludge.Chinese invention patent CN201510424135.5 softens desulfurization wastewater by two-stage reaction, specifically: to level-one
Milk of lime is added in reaction chamber and sodium sulphate precipitates calcium and magnesium ion, is passed through carbon dioxide into second order reaction case to precipitate residue
Calcium ion, consume a large amount of sodium sulphate and milk of lime during the method softening waste water, the magnesium hydroxide purity of generation compared with
It is low that magnesium products is caused to be worth lower, a large amount of sludge that not can be carried out effective recycling, and generate in wastewater treatment process
It cannot recycle, cause environmental pollution.Chinese invention patent CN201711487269.7 is by successively adding lime and sodium carbonate
Mode softens desulfurization wastewater, and the method is not suitable for high magnesium desulfurization wastewater, big, at high cost, generation the magnesium hydroxide of reagent consumption amount
Purity is lower, and considerably increases sludge quantity.
Utility model content
The utility model aims at the problems existing in the prior art, and provides a kind of device for recycling magnesium in high magnesium desulfurization wastewater,
While softening waste water, the sludge quantity of generation is less, and a small amount of sludge generated is made after plate and frame filter press filters pressing
Mud cake outward transport, recycling is convenient, will not generate pollution to environment；The magnesium hydroxide products of high-purity, high value can be recovered to, are given up
Cost of water treatment is low；Utilize CO in desulfurization tower flue gas2The pH of waste water after reducing recycling magnesium, reduces the dosage of medicament.
Technical problem described in the utility model is solved with following technical solution:
A kind of device recycling magnesium in high magnesium desulfurization wastewater, described device include desulfurizing tower, neutralization pond, magnesium recovery pond and exposure
Gas pond, the desulfurizing tower liquid outlet connect the inlet of the neutralization pond, and the upper end outlet of the neutralization pond connects the magnesium and returns
Receives pond inlet, the supernatant liquor in the neutralization pond are sent into the magnesium recovery pond, the discharge port of magnesium recovery pond bottom end
Magnesium precipitate pond is connected, upper end liquid outlet connects the aeration tank, and the sediment in the magnesium recovery pond is directly discharged to the magnesium
In sedimentation basin, supernatant is inputted in the aeration tank, and the desulfurizing tower exiting flue gas is blasted in the aeration tank by air blower,
The aeration bottom of pond portion connects calcium carbonate and magnesium carbonate sedimentation basin, and the sediment in the calcium carbonate and magnesium carbonate sedimentation basin passes through
Lime stone pulping system returns in the desulfurizing tower, recycles, and the aeration tank supernatant outlet connects subsequent processing list
Member.
The device of magnesium, adds plate and frame filter press, the bottom end outlet with the neutralization pond in the above-mentioned high magnesium desulfurization wastewater of recycling
Connection.
The device of magnesium, adds centrifuge in the above-mentioned high magnesium desulfurization wastewater of recycling, and the sediment in the magnesium precipitate pond passes through
Dried recovered after the centrifuge centrifugation.
The utility model recycles the device and method of magnesium mainly in the high magnesium desulfurization wastewater in coal-burning power plant, passes through Dual alkali
It adjusts pH and is aided with CO2The magnesium in high magnesium desulfurization wastewater is recycled in carbonization, and the sludge quantity generated during waste water sofening treatment is less,
And mud cake outward transport is made in a small amount of sludge generated after plate and frame filter press filters pressing, and recycling is convenient, will not generate to environment dirty
Dye；Magnesium in desulfurization wastewater is recovered as product, controls the pH value of waste water in magnesium recovery pond, has obtained that purity is higher, impurity
Less, the regular high-quality magnesium hydroxide of epigranular, appearance, creates certain economic benefit；Utilize the flue gas in desulfurizing tower
It is passed through in aeration tank, the CO in flue gas2The pH of waste water after reducing recycling magnesium, the calcium during this in desulfurization wastewater are converted into
Calcium carbonate is recovered to desulphurization system by lime stone pulping system, greatly reduces the additional amount of medicament, reduces wastewater treatment
Cost and pollution to environment, while alleviating the adverse effect to subsequent desulfurization wastewater processing unit.
Detailed description of the invention
Fig. 1 is utility model device process flow chart；
Fig. 2 is to go during removing heavy metals calcium increment rate and magnesium slip with pH change curve；
Fig. 3 be plus alkali during the magnesium rate of recovery and magnesium purity with pH change curve；
Fig. 4 is logical CO2Calcium precipitate rate is with pH change curve in the process.
Each list of reference numerals in figure are as follows: 1, desulfurizing tower；2, neutralization pond；3, plate and frame filter press；4, magnesium recovery pond；5, magnesium precipitate
Pond；6, centrifuge；7, aeration tank；8, blower；9, calcium carbonate and magnesium carbonate sedimentation basin；10, lime stone pulping system；11, subsequent
Processing unit.
Specific embodiment
The utility model relates to reaction principle include the following:
1, Ca (OH) is added into neutralization pond 22, it removes the heavy metal in desulfurization wastewater: containing heavy metal in desulfurization wastewater,
Such as Cr, Cd, Pb, Hg, Cu.Heavy metal contaminants have preferable dissolubility wherein, straight although their content is less
Run in put and there is certain toxic action to aquatile, and be transmitted to the biology of better nutritivity stratum by food chain, simultaneously also
Can have an adverse effect to the recycling of subsequent magnesium products.Therefore, it is necessary first to which heavy metal is removed.Ca is added into desulfurization wastewater
(OH)2Powder tune pH value is to 8.0-9.0, Bian Jia Ca (OH)2Waste water is stirred on side, is removed by filtration most in desulfurization wastewater
The substances such as heavy metal and suspended matter, reaction equation are as follows:
(1)
Ca2++ SO4 2- =CaSO4↓ (2)
W represents heavy metal ion in formula (1).
2, alkali adding method recycles magnesium: high magnesium low calcium desulfurization wastewater is directed to, due to calcium-magnesium content gap great disparity, hydrogen in desulfurization wastewater
Magnesia solubility product is far smaller than calcium hydroxide, and the alkali of various concentration same volume is added, and adjusts the pH value of waste water, guarantees to produce
Raw Mg (OH)2The purity of sediment, and recycled, reaction equation is as follows:
(3)
(4)
3, being passed through flue gas reduces the pH value of waste water: the supernatant pH value after adding alkali collection magnesium is higher, after not being able to satisfy entrance
The requirement of continuous processing unit, therefore, it is necessary to reduce pH value to meet the needs of subsequent processing.Utilize the CO in desulfurization fume2, will
Flue gas is passed through in supernatant, to reduce pH value, avoids generating secondary pollution using a large amount of chemical agents, reaction equation is as follows:
(5)
(6)
The preliminary test that alkali adding method recycles magnesium in high magnesium low calcium desulfurization wastewater: during the experiment, practical sulphur removal waste water
The concentration of middle calcium ion is 440 mg/L, and magnesium ion concentration is 13011 mg/L.All processes for being related to dosing use blender
It is stirred.
The utility model is described in further detail with reference to embodiments.
The desulfurization wastewater that desulfurizing tower 1 is generated is sent into neutralization pond 2, and Ca (OH) is added into neutralization pond 22Adjust waste water
PH value, wastewater sample when being 8.0,8.4,8.5,8.6,8.8,9.0 and 9.2 to pH value are sampled measurement, and measurement calcium increases
The trend for adding rate and magnesium precipitate rate to change with pH, obtains optimal pH, so that the heavy metal ion precipitation capacity in waste water is maximum
While change, the rate of deposition of magnesium is reduced.Referring to Fig. 2, it can be deduced that, calcium increment rate increases, magnesium precipitate rate with the raising of pH value
The trend risen afterwards is first remained unchanged with the raising presentation of pH value, when pH value is adjusted to 8.8, the rate of deposition of magnesium is minimum, then
By supernatant liquor is obtained by filtration, sediment is discharged after plate and frame filter press carries out compression processing；
The supernatant liquor for removing heavy metal enters in magnesium recovery pond 4, and concentration difference, volume phase are added into magnesium recovery pond 4
Same NaOH solution, so that the Mg in waste water generates Mg (OH)2Sediment adjusts the pH value of waste water, under the conditions of different pH
Separately sampled measurement magnesium precipitate rate and magnesium purity, referring to Fig. 3, the trend constantly risen is presented with the raising of pH in magnesium precipitate rate,
And downward trend after first rising then is presented in magnesium purity with the raising of pH value, this is because the later period is molten with the addition of lye NaOH
Calcium in liquid also creates precipitating, so that magnesium purity starts to reduce.When pH value is 10.2 or so, magnesium purity highest is approached
100%；When pH value reaches 11 or so, although the magnesium in solution has almost obtained whole recycling, alkali number is consumed more
It is more, and magnesium purity also reduces, and cannot reach I class magnesium hydroxide purity as defined in HG/T 3607-2007 not less than 97.5%
Index.So the quality and the rate of recovery of magnesium hydroxide products are ok adding the stage of alkali collection magnesium that pH value is adjusted to 10.2
It is guaranteed.The Mg (OH) of generation2Sediment enters in magnesium precipitate pond, and by dried recovered after centrifuge centrifugation, can obtain
To the Mg (OH) of higher degree2Product；
The supernatant liquor for having recycled magnesium enters in aeration tank 7, and the flue gas in desulfurizing tower 1 enters aeration tank 7 by air blower 8
In, CO is contained in flue gas2, for adjusting the pH value of waste water, the part calcium in waste water will form precipitation of calcium carbonate, referring to Fig. 4, calcium
Rate of deposition is with the increase first increases and then decreases with wastewater pH, and to guarantee that calcium precipitate rate is maximum, obtaining pH value of waste water should be 8.5.It will
PH value can stop being aerated after being adjusted to 8.5, be discharged to calcium carbonate and magnesium carbonate sedimentation basin in precipitatings such as the calcium carbonate of 7 bottom of aeration tank
9, precipitation of calcium carbonate can be used for lime stone pulping system 10, and the lime stone slurry made can back within desulfurizing tower 1 again, expose
7 supernatant liquor of gas pond is sent into subsequent processing units 11 and carries out subsequent processing.Heavy metal after above-mentioned processing, in desulfurization wastewater
It has been removed with most calcium and magnesiums, water quality has obtained largely softening, for subsequent zero discharge treatment equipment, without two
Secondary pollution and fouling risk bring great benefit for power plant.
Claims (3)
1. a kind of device for recycling magnesium in high magnesium desulfurization wastewater, it is characterised in that: described device includes desulfurizing tower (1), neutralization pond
(2), magnesium recovery pond (4) and aeration tank (7), desulfurizing tower (1) liquid outlet connects the inlet of the neutralization pond (2), described
The upper end outlet of neutralization pond (2) connects magnesium recovery pond (4) inlet, and the supernatant liquor in the neutralization pond (2) is sent into institute
It states in magnesium recovery pond (4), the discharge port of magnesium recovery pond (4) bottom end connects magnesium precipitate pond (5), described in the connection of upper end liquid outlet
Aeration tank (7), the sediment in the magnesium recovery pond (4) are directly discharged in the magnesium precipitate pond (5), described in supernatant input
In aeration tank (7), desulfurizing tower (1) exiting flue gas is blasted in the aeration tank (7) by air blower (8), the aeration tank
(7) bottom connects calcium carbonate and magnesium carbonate sedimentation basin (9), and the sediment in the calcium carbonate and magnesium carbonate sedimentation basin (9) passes through
Lime stone pulping system (10) returns in the desulfurizing tower (1), recycles, aeration tank (7) the supernatant outlet connection
Subsequent processing units (11).
2. the device of magnesium in the high magnesium desulfurization wastewater of recycling according to claim 1, it is characterised in that: add plate and frame filter press
(3), it is connect with the bottom end outlet of the neutralization pond (2).
3. the device of magnesium in the high magnesium desulfurization wastewater of recycling according to claim 2, it is characterised in that: centrifuge (6) are added,
Dried recovered after sediment in the magnesium precipitate pond (5) is centrifuged by the centrifuge (6).
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| CN201920250500.9U CN209721798U (en) | 2019-02-27 | 2019-02-27 | A kind of device recycling magnesium in high magnesium desulfurization wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109748422A (en) * | 2019-02-27 | 2019-05-14 | 华能沁北发电有限责任公司 | A kind of device and method recycling magnesium in high magnesium desulfurization wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109748422A (en) * | 2019-02-27 | 2019-05-14 | 华能沁北发电有限责任公司 | A kind of device and method recycling magnesium in high magnesium desulfurization wastewater |
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