CN106745324A - PAFS, preparation method and applications - Google Patents
PAFS, preparation method and applications Download PDFInfo
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- CN106745324A CN106745324A CN201611253259.2A CN201611253259A CN106745324A CN 106745324 A CN106745324 A CN 106745324A CN 201611253259 A CN201611253259 A CN 201611253259A CN 106745324 A CN106745324 A CN 106745324A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/009—Compounds containing, besides iron, two or more other elements, with the exception of oxygen or hydrogen
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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Abstract
The present invention relates to water treatment field, specifically, there is provided a kind of PAFS, preparation method and applications.The preparation method of the PAFS, comprises the following steps：First, ferrous sulfate and sulfuric acid solution are mixed and heated to 70 80 DEG C, add natrium nitrosum mixing, it is closed after be passed through oxygen until flue gas disappear, obtain ferric sulfate；Then, stop being passed through oxygen, add aluminium hydroxide to stir to being completely dissolved, aluminum sulfate is obtained after cooling；Finally, the PAFS is obtained after curing.The method has simple, efficient, free of contamination advantage.
Description
Technical field
The present invention relates to water treatment field, in particular to a kind of PAFS, preparation method and applications.
Background technology
Water treatment agent is required chemical agent in industrial water, domestic water, waste water dis posal process, by using this
A little chemical agents, can make water conform to quality requirements.Its primary effect is to control the composition of incrustation scale and sludge, cut down foam, cut
Subtract the data erosion contacted with water, the suspended solid and noxious material, deodorization and discoloration, demineralized water removed in water etc..Work as cause
For countries of world water consumption is drastically added, all kinds of environmentally friendly laws (water treating method) are followed on sb.'s heels promulgation, and require it is increasingly severe, so
Promote quickly on all kinds of efficient water disposal medicaments.It is water is disposed with increasingly serious water resources crisis contradiction in China
The production capacity of medicament is very low, and quality cannot also be supervised, so accelerating the development of China water treatment agent this environmental protection industry (epi) to compel
The eyebrows and eyelashes.
PAFS has the decolorizing effect of aluminium salt purifying water effect, molysite concurrently, and cost of water treatment is low, while overcoming list
Fine aluminium salt high cost, excess of aluminum residual is stored in hostile environment in water, the simple easy yellowing of molysite and blackening, and iron ion is too high, print
Dye enterprise cannot reuse shortcoming.PAFS has double properties, being capable of more offer positive charges and negatively charged
There is adsorption charge and neutralize in colloid and water soluble organic substance, contained long-chain molecule causes to build bridge and adsorb while existing in flocculation
The volume effect of sweeping.The product integrates the advantage of aluminium salt system and molysite system efficient water-purifying agent, alkali high with active constituent content
Degree is high, and the degree of polymerization is big, and molecule link network gathers, huge structure, have during purification of water quality stronger adsorption-condensation ability and
More preferable clean-up effect, is a kind of efficient, quick, low consumption, nontoxic, safe inorganic high efficient water purification agent of new generation.It is cleverly sharp
It is compensatory with iron ion, effectively eliminate harm of the aluminium ion to human body in water purification.PAFS is than traditional product
The consumptions such as product-solid polyaluminium chloride PAC, liquid aluminium sulfate, liquid aluminium polychloride, bodied ferric sulfate, poly-ferric chloride can
It is greatly reduced, cost input is low.Water quality particularly to low turbidity and high concentrtion seriously changes and decolourizes difficult water process problem,
The insurmountable purification of existing water purification agent can be reached to require.
However, obtained using Traditional preparation more than existing PAFS, for example with hydrogen peroxide as oxidant
Make oxidation of divalent iron ion for ferric ion, or accelerate reaction speed as catalyst using natrium nitrosum, preparation process
The NO of middle generationxGas has pollution to environment.
In view of this, it is special to propose the present invention.
The content of the invention
The first object of the present invention is to provide a kind of preparation method of PAFS, this method provide polymerised sulphur
A kind of new approaches prepared by sour ferro-aluminum, it is the oxidant of ferric ion as oxidation of divalent iron ion to use oxygen, while adopting
With natrium nitrosum ferric sulfate is obtained as catalyst, it is often more important that, reaction is carried out under relative airtight condition, can only enter oxygen
Gas can not outwards be vented, the NO in course of reactionxGas is most reintegrated in liquid at last, environmental pollution is reduced, with letter
Single, efficient, free of contamination advantage.
The second object of the present invention is to provide a kind of PAFS, and the PAFS is by above method system
It is standby to obtain, have the advantages that product purity is high, good sewage processing effect.
The third object of the present invention is to provide a kind of application of PAFS, by above-mentioned PAFS application
In sewage disposal, there is good sewage processing effect, safe and nontoxic.
In order to realize above-mentioned purpose of the invention, spy uses following technical scheme：
In a first aspect, the invention provides a kind of preparation method of PAFS, comprising the following steps：First, will
Ferrous sulfate and sulfuric acid solution are mixed and heated to 70-80 DEG C, add natrium nitrosum mixing, it is closed after be passed through oxygen until
Flue gas disappears, and obtains ferric sulfate；Then, stop being passed through oxygen, add aluminium hydroxide to stir to being completely dissolved, sulphur is obtained after cooling
Sour aluminium；Finally, the PAFS is obtained after curing.
In further preferably technical scheme, the ferrous sulfate and sulfuric acid solution are to contain ferrous sulfate and sulfuric acid
Industrial acid-washed waste water.
In further preferably technical scheme, the cooling is reduction temperature to 15-25 DEG C.
In further preferably technical scheme, the weight ratio of the ferrous sulfate, aluminium hydroxide, sulfuric acid and natrium nitrosum
It is (140-160)：(70-90)：(190-210)：(0.4-0.6).
In further preferably technical scheme, the weight ratio of the ferrous sulfate, aluminium hydroxide, sulfuric acid and natrium nitrosum
It is 152:78:196:0.46.
In further preferably technical scheme, the preparation method of described PAFS is comprised the following steps：It is first
First, the ferrous sulfate heptahydrate of the industrial acid-washed waste water of 500 weight portions and 360 weight portions is mixed and heated to 70-80 DEG C, wherein work
Industry pickling waste waters is the iron content dilute sulfuric acid that acidity of sulfuric acid is 14%, iron content 4%, and the iron-holder of ferrous sulfate heptahydrate is 16.7%,
The sodium nitrite solution for adding 8 weight portions is mixed, and the mass concentration of sodium nitrite solution is 30%, it is closed after be passed through oxygen
Gas is until flue gas disappearance, obtains ferric sulfate；
Then, stop being passed through oxygen, the water purification aluminium hydroxide of 31.2 weight portions is added, wherein in water purification aluminium hydroxide
The content of aluminium hydroxide is 64%, and stirring reduces temperature to obtaining aluminum sulfate after 15-25 DEG C to being completely dissolved；
Finally, stand and obtain within 2-5 days the PAFS.
In further preferably technical scheme, also including exhaust-gas treatment the step of, by during preparation method produce
Acid waste gas are washed using alkaline solution as detergent, are then discharged.
In further preferably technical scheme, the collection including acid waste gas, spent acidic the step of the exhaust-gas treatment
The washing and the discharge of waste gas up to standard of gas, the washing of wherein acid waste gas include detergent circulate and acid waste gas exist
The cross flow one with detergent on the rightabout of detergent；
Preferably, the step of exhaust-gas treatment is carried out in exhaust gas washing tower, and waste gas is entered by the bottom of towe of exhaust gas washing tower
Enter tower body, from bottom to top through packing layer, finally discharged from tower top；Meanwhile, detergent enters tower body by tower top, by liquid
Distribution apparatus is equably sprayed in packing layer and flowed downward along filler layer surface until bottom of towe, remaking circulation through pump makes
With.
Second aspect, the invention provides a kind of PAFS, the PAFS is according to above-mentioned system
What Preparation Method was prepared from.
The third aspect, the invention provides a kind of application of PAFS, above-mentioned PAFS is applied to
In sewage disposal.
Compared with prior art, beneficial effects of the present invention are：
The invention provides a kind of preparation method of PAFS, PAFS preparation is this method provide
A kind of new approaches, it is the oxidant of ferric ion as oxidation of divalent iron ion to use oxygen, while being made using natrium nitrosum
For catalyst obtains ferric sulfate, it is often more important that, reaction is carried out under relative airtight condition, and can only enter oxygen can not outwards arrange
Gas, the NO in course of reactionxGas is most reintegrated in liquid at last, reduces environmental pollution, the preparation method have it is simple,
Efficiently, free of contamination advantage.
A kind of PAFS that the present invention is provided is prepared by the above method, and the PAFS has product
Purity is high, good sewage processing effect advantage.
The invention provides a kind of application of PAFS, above-mentioned PAFS is applied to sewage disposal and is worked as
In, there is good sewage processing effect, safe and nontoxic.
Specific embodiment
Embodiment of the present invention is described in detail below in conjunction with embodiment, but those skilled in the art will
Understand, the following example is merely to illustrate the present invention, and is not construed as limiting the scope of the present invention.It is unreceipted specific in embodiment
Condition person, the condition advised according to normal condition or manufacturer is carried out.
In a first aspect, the invention provides a kind of preparation method of PAFS, comprising the following steps：First, will
Ferrous sulfate and sulfuric acid solution are mixed and heated to 70-80 DEG C, add natrium nitrosum mixing, it is closed after be passed through oxygen until
Flue gas disappears, and obtains ferric sulfate；Then, stop being passed through oxygen, add aluminium hydroxide to stir to being completely dissolved, sulphur is obtained after cooling
Sour aluminium；Finally, the PAFS is obtained after curing.
The preparation method of above-mentioned PAFS provides a kind of new approaches prepared by PAFS, using oxygen
It is the oxidant of ferric ion as oxidation of divalent iron ion, while ferric sulfate is obtained as catalyst using natrium nitrosum,
Importantly, reaction is carried out under relative airtight condition, can only enter oxygen can not outwards be vented, the NO in course of reactionx
Gas is most reintegrated in liquid at last, reduces environmental pollution, and the preparation method has simple, efficient, free of contamination advantage.
Technological principle of the invention is as follows：
2FeSO4+1/2O2+H2SO4→Fe2(SO4)3+H2O
2Al(OH)3+3H2SO4→Al2(SO4)3+6H2O
Hydrolysis：
Fe2(SO4)3+Al2(SO4)3+H2O→Fe2Al2(OH)n(SO4)3-n/2+n/2H2SO4
Polymerisation：
m[Fe2Al2(OH)n(SO4)3-n/2]→[Fe2Al2(OH)n(SO4)3-n/2·xH2O]m(m≤13,1≤n≤5)
First, it is ferric sulfate that ferrous sulfate is oxidized by oxygen, and aluminium hydroxide is changed into aluminum sulfate, then ferric sulfate and sulfuric acid
PAFS is obtained after aluminium curing, specifically, ferric sulfate and aluminum sulfate obtain aluminium iron sulfate through hydrolysis, then aluminium iron sulfate
It is polymerized to PAFS.
The temperature of above-mentioned heating it is typical but non-limiting be：70℃、71℃、72℃、73℃、74℃、75℃、76℃、
77 DEG C, 78 DEG C, 79 DEG C or 80 DEG C.The time of above-mentioned standing it is typical but non-limiting be：2 days, 2.5 days, 3 days, 3.5 days, 4
My god, 4.5 days or 5 days.
Used as further preferably implementation method, the ferrous sulfate and sulfuric acid solution are to contain ferrous sulfate and sulfuric acid
Industrial acid-washed waste water.
Using the industrial acid-washed waste water (particularly steel mill's pickling waste waters) containing ferrous sulfate and sulfuric acid as ferrous sulfate and
Sulfuric acid solution can realize industrial acid-washed useless water reuse, be not only able to reduces cost, moreover it is possible to reduce environmental pollution, and formation is followed
Ring economy.
Used as further preferably implementation method, the cooling is reduction temperature to 15-25 DEG C.Aluminium hydroxide and sulfuric acid
Reaction does not need high temperature, is reacted at a temperature of 15-25 DEG C, is not required to heating, reduces energy waste.
As further preferably implementation method, the weight ratio of the ferrous sulfate, aluminium hydroxide, sulfuric acid and natrium nitrosum
It is (140-160)：(70-90)：(190-210)：(0.4-0.6).Aforementioned proportion can be 140:70:190:0.4、140:80:
200:0.5、140:90:210:0.6、150:70:190:0.4、150:80:200:0.5、150:90:210:0.6、160:70:
190:0.4、160:80:200:0.5、160:90:210:0.6 or 152:78:196:0.46.
As further preferably implementation method, the weight ratio of the ferrous sulfate, aluminium hydroxide, sulfuric acid and natrium nitrosum
It is 152:78:196:0.46.By the weight than preparing all raw materials that PAFS enables in addition to natrium nitrosum
It is completely converted into PAFS finished product, raw material availability highest.
Used as further preferably implementation method, the preparation method of described PAFS is comprised the following steps：It is first
First, the ferrous sulfate heptahydrate of the industrial acid-washed waste water of 500 weight portions and 360 weight portions is mixed and heated to 70-80 DEG C, wherein work
Industry pickling waste waters is the iron content dilute sulfuric acid that acidity of sulfuric acid is 14%, iron content 4%, and the iron-holder of ferrous sulfate heptahydrate is 16.7%,
The sodium nitrite solution for adding 8 weight portions is mixed, and the mass concentration of sodium nitrite solution is 30%, it is closed after be passed through oxygen
Gas is until flue gas disappearance, obtains ferric sulfate；
Then, stop being passed through oxygen, the water purification aluminium hydroxide of 31.2 weight portions is added, wherein in water purification aluminium hydroxide
The content of aluminium hydroxide is 64%, and stirring reduces temperature to obtaining aluminum sulfate after 15-25 DEG C to being completely dissolved；
Finally, stand and obtain within 2-5 days the PAFS.
Above-mentioned preparation method is effectively utilized industrial acid-washed waste water, by ferrous sulfate and sulphur contained in industrial acid-washed waste water
Acid is oxidized by oxygen into ferric sulfate under the catalytic action of catalyst natrium nitrosum, and in course of reaction, natrium nitrosum can decompose product
Raw NOxGas, but because the reaction is carried out under conditions of relatively closed, i.e., there can only be oxygen to be passed through and other gases
Can not be discharged, therefore, finally decompose the NO of generationxGas will be reintegrated in solution, reduce the row of pernicious gas
Put, it is environment-friendly.Then, remaining sulfuric acid reaction obtains aluminum sulfate in aluminium hydroxide and solution.Finally, ferric sulfate and aluminum sulfate
Aluminium iron sulfate is obtained by hydrolysis, aluminium iron sulfate is aggregated to and forms PAFS together.Wherein, water purification is selected with aluminium hydroxide
With the existing commercially available aluminium hydroxide dedicated for water purification, active ingredient is aluminium hydroxide in the commercially available water purification aluminium hydroxide
Content be 64%.In the present invention, except as expressly described, content refers both to percentage by weight.
As further preferably implementation method, also including exhaust-gas treatment the step of, by what is produced during preparation method
Acid waste gas are washed using alkaline solution as detergent, are then discharged.In actual fabrication process, it is possible to produce acid
Property gas, the sour gas that for example sulfuric acid is produced, this sour gas is directly discharged to be polluted the environment in air, strong to human body
Health is harmful to, therefore acid waste gas are carried out into acid-base neutralization using alkaline solution the step of increase exhaust-gas treatment in preparation process
Washing so that waste gas is changed into neutral, it is up to standard after discharge again.The alkaline solution can be sodium hydroxide solution, potassium hydroxide solution
Or other are in the solution of alkalescence.
As further preferably implementation method, the collection including acid waste gas, spent acidic the step of the exhaust-gas treatment
The washing and the discharge of waste gas up to standard of gas, the washing of wherein acid waste gas include detergent circulate and acid waste gas exist
The cross flow one with detergent on the rightabout of detergent；
Preferably, the step of exhaust-gas treatment is carried out in exhaust gas washing tower, and waste gas is entered by the bottom of towe of exhaust gas washing tower
Enter tower body, from bottom to top through packing layer, finally discharged from tower top；Meanwhile, detergent enters tower body by tower top, by liquid
Distribution apparatus is equably sprayed in packing layer and flowed downward along filler layer surface until bottom of towe, remaking circulation through pump makes
With.
Filler is made with Raschig ring in scrubbing tower differential contacts counter-current operation, tower, as the basic building block of gas-liquid contact.Its
In, differential contacts counter-current operation refers to that two-phase is continuously contacted and contrary flows, the composition streamwise consecutive variations of two-phase.
Specifically, waste gas enters tower body by bottom of towe, from bottom to top through packing layer, finally discharged from tower top, detergent is entered by tower top
Enter tower body, equably sprayed by liquid distribution device and flowed downward along filler layer surface in packing layer, until bottom of towe is passed through
Water pump remakes recycling.Because ascending air and decline detergent are constantly contacted in packing layer, so molten in ascending air
The concentration of matter is more and more lower, washing is reached during to tower top and is required outside discharge tower.According to analogy, scrubbing tower processing unit to acid mist with
And the clearance of dust can reach more than 95%.After treatment, the concentration of emission of acid mist and dust is respectively 20mg/ to waste gas
m3、30.75mg/m3.Project acid mist waste gas through process it is up to standard after, by aiutage (15m) high altitude discharge.
Second aspect, the invention provides a kind of PAFS, the PAFS is according to above-mentioned system
What Preparation Method was prepared from, the PAFS has the advantages that product purity is high, good sewage processing effect.
The third aspect, the invention provides a kind of application of PAFS, will be by above-mentioned PAFS application
In sewage disposal, there is good sewage processing effect, safe and nontoxic.
Embodiment 1
A kind of PAFS, is prepared by following methods：First, by the industrial acid-washed waste water of 500 weight portions and
The ferrous sulfate heptahydrate of 360 weight portions is mixed and heated to 75 DEG C, wherein it is 14%, iron content that industrial acid-washed waste water is acidity of sulfuric acid
4% iron content dilute sulfuric acid, the iron-holder of ferrous sulfate heptahydrate is 16.7%, adds the sodium nitrite solution mixing of 8 weight portions
Stirring, the mass concentration of sodium nitrite solution is 30%, it is closed after be passed through oxygen until flue gas disappears, obtain ferric sulfate；
Then, stop being passed through oxygen, the water purification aluminium hydroxide of 31.2 weight portions is added, wherein in water purification aluminium hydroxide
The content of aluminium hydroxide is 64%, and stirring reduces temperature to obtaining aluminum sulfate after 20 DEG C to being completely dissolved；
Finally, stand and hydrolyze and aggregate into the PAFS in 3 days.
The quality measurements of above-mentioned PAFS, as shown in table 1.
The PAFS quality measurements 1 of table 1
Embodiment 2
A kind of PAFS, is prepared by following methods：First, by the ferrous sulfate of 152 weight portions and 200 weights
Measure part sulfuric acid be mixed and heated to 75 DEG C, add 0.5 weight portion sodium nitrite solution mix, it is closed after be passed through oxygen
Until flue gas disappears, ferric sulfate is obtained；
Then, stop being passed through oxygen, add the aluminium hydroxide of 195 weight portions, stirring reduces temperature to 20 to being completely dissolved
Aluminum sulfate is obtained after DEG C；
Finally, stand and hydrolyze and aggregate into the PAFS in 3 days.
The quality measurements of above-mentioned PAFS, as shown in table 2.
The PAFS quality measurements 2 of table 2
Comparative example
The PAFS that Samsung Water Management Equipment Ltd. of Gongyi City provides.
Table 3 and table 4 each provide the result using the different water samples of different disposal chemicals treatment.
The Shaoxing Wastewater Treatment Plant water sample result of table 3
From above-mentioned result, the COD clearances after the PAFS obtained using embodiment 1 is processed are compared
The COD clearances of GB aluminum sulfate improve 32.41%, and the COD clearances of the PAFS obtained compared to comparative example are carried
It is high by 12.30%；Using COD of the COD clearances compared to GB aluminum sulfate after the PAFS treatment that embodiment 2 is obtained
Clearance improves 41.58%, and the COD clearances of the PAFS obtained compared to comparative example improve 20.07%.Thus
Understand, the wastewater treatment efficiency of the PAFS obtained using preparation method of the invention is substantially better than existing GB sulphur
The treatment effect of sour aluminium, and the treatment level of existing PAFS has been met and exceeded, with good sewage processing effect
Advantage.
Printing and dyeing Co., Ltd of the Shaoxing China of table 4 water sample result
From above-mentioned result, the COD clearances after the PAFS obtained using embodiment 1 is processed are compared
The COD clearances of GB aluminum sulfate improve 36.98%, and the COD clearances of the PAFS obtained compared to comparative example are carried
It is high by 13.69%；Using COD of the COD clearances compared to GB aluminum sulfate after the PAFS treatment that embodiment 2 is obtained
Clearance improves 41.74%, and the COD clearances of the PAFS obtained compared to comparative example improve 17.64%.Thus
Understand, the dyeing and printing sewage treatment effect of the PAFS obtained using preparation method of the invention is substantially better than existing state
The treatment effect of bodied ferric sulfate is marked, and has met and exceeded the treatment level of existing PAFS, it is dirty with printing and dyeing
The good advantage of water treatment efficiency.
In summary, reasonable, the resulting polymerization of the preparation method processing step of the PAFS that the present invention is provided
Aluminium iron sulfate has the advantages that good sewage processing effect.
Although illustrate and describing the present invention with specific embodiment, but will be appreciated that without departing substantially from of the invention
Many other changes and modification can be made in the case of spirit and scope.It is, therefore, intended that in the following claims
Including belonging to all such changes and modifications in the scope of the invention.
Claims (10)
1. a kind of preparation method of PAFS, it is characterised in that comprise the following steps：First, by ferrous sulfate and sulphur
Acid solution is mixed and heated to 70-80 DEG C, add natrium nitrosum mixing, it is closed after be passed through oxygen until flue gas disappear, obtain
To ferric sulfate；Then, stop being passed through oxygen, add aluminium hydroxide to stir to being completely dissolved, aluminum sulfate is obtained after cooling；Finally,
The PAFS is obtained after curing.
2. the preparation method of PAFS according to claim 1, it is characterised in that the ferrous sulfate and sulfuric acid
Solution is the industrial acid-washed waste water containing ferrous sulfate and sulfuric acid.
3. the preparation method of PAFS according to claim 1, it is characterised in that the cooling is to reduce temperature
To 15-25 DEG C.
4. the preparation method of PAFS according to claim 1, it is characterised in that the ferrous sulfate, hydrogen-oxygen
The weight ratio for changing aluminium, sulfuric acid and natrium nitrosum is (140-160)：(70-90)：(190-210)：(0.4-0.6).
5. the preparation method of PAFS according to claim 4, it is characterised in that the ferrous sulfate, hydrogen-oxygen
The weight ratio for changing aluminium, sulfuric acid and natrium nitrosum is 152:78:196:0.46.
6. the preparation method of PAFS according to claim 1, it is characterised in that comprise the following steps：First,
The ferrous sulfate heptahydrate of the industrial acid-washed waste water of 500 weight portions and 360 weight portions is mixed and heated to 70-80 DEG C, wherein industry
Pickling waste waters is the iron content dilute sulfuric acid that acidity of sulfuric acid is 14%, iron content 4%, and the iron-holder of ferrous sulfate heptahydrate is 16.7%, then
Add the sodium nitrite solution of 8 weight portions to mix, the mass concentration of sodium nitrite solution is 30%, it is closed after be passed through oxygen
Until flue gas disappears, ferric sulfate is obtained；
Then, stop being passed through oxygen, add the water purification aluminium hydroxide of 31.2 weight portions, wherein hydrogen-oxygen in water purification aluminium hydroxide
The content for changing aluminium is 64%, and stirring reduces temperature to obtaining aluminum sulfate after 15-25 DEG C to being completely dissolved；
Finally, stand and obtain within 2-5 days the PAFS.
7. the preparation method of PAFS according to claim 6, it is characterised in that the also step including exhaust-gas treatment
Suddenly, the acid waste gas produced during preparation method are washed using alkaline solution as detergent, is then discharged.
8. the preparation method of PAFS according to claim 7, it is characterised in that the step of the exhaust-gas treatment
The washing of collection, acid waste gas including acid waste gas and the discharge of waste gas up to standard, the wherein washing of acid waste gas include washing
Agent is circulated and cross flow one with detergent of the acid waste gas on the rightabout of detergent；
Preferably, the step of exhaust-gas treatment is carried out in exhaust gas washing tower, and waste gas enters tower by the bottom of towe of exhaust gas washing tower
Body, from bottom to top through packing layer, finally discharges from tower top；Meanwhile, detergent enters tower body by tower top, by liquid distribution
Device is equably sprayed in packing layer and flowed downward along filler layer surface until bottom of towe, recycling is remake through pump.
9. a kind of PAFS, it is characterised in that the PAFS is according to claim any one of 1-8
Preparation method be prepared from.
10. a kind of application of PAFS, it is characterised in that be applied to the PAFS described in claim 9
In sewage disposal.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108083404A (en) * | 2018-01-23 | 2018-05-29 | 辽宁好立自动化机械设备有限公司 | Environment-friendly novel carwash circulating water flocculating and purifying powder |
| CN108529729A (en) * | 2018-05-19 | 2018-09-14 | 原建光 | Preparation method of solid composite water purifying agent |
| CN109081382A (en) * | 2018-10-25 | 2018-12-25 | 马鞍山健鼎化工有限公司 | A kind of processing technology of bodied ferric sulfate |
| CN115043471A (en) * | 2022-06-16 | 2022-09-13 | 白银有色集团股份有限公司 | Method for preparing polysilicate aluminum ferric sulfate flocculant by using copper smelting furnace slag |
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