CN107792867A - A kind of sodium pyrosulfite preparation technology utilized based on feedstock circulation - Google Patents
A kind of sodium pyrosulfite preparation technology utilized based on feedstock circulation Download PDFInfo
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- CN107792867A CN107792867A CN201711168384.8A CN201711168384A CN107792867A CN 107792867 A CN107792867 A CN 107792867A CN 201711168384 A CN201711168384 A CN 201711168384A CN 107792867 A CN107792867 A CN 107792867A
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- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/14—Preparation of sulfites
- C01D5/145—Pyrosulfites or metabisulfites
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Abstract
The present invention discloses a kind of sodium pyrosulfite preparation technology utilized based on feedstock circulation, comprises the following steps：Troilite is added in fluidized bed furnace, carries out magnetic roasting；The furnace gas of production is entered by pipeline dry method dust is carried out in electric cleaner, entered back into after dedusting in scrubbing tower；Obtained gas is incorporated into drier by pipeline；Into the first reactor by accumulator tank add recovery sodium carbonate liquor, by it is obtained it is qualified after furnace gas be incorporated into blower fan, blower fan, which is delivered to furnace gas in the first reactor by the first breather line, to be reacted；Present invention design is simple, the furnace gas of output carries out being reacted to obtain the sodium pyrosulfite of exquisiteness again after effectively absorbing after can troilite be calcined, expand the raw material range of choice of sodium pyrosulfite, three-level absorption is carried out to sulfur dioxide, fully reaction, technique is simple, high income, sodium hydroxide solution in absorption tower can recycle, simple operation, have use and economic value well.
Description
Technical field
The invention belongs to chemical technology field, and in particular to a kind of preparation technology of sodium pyrosulfite, more particularly
A kind of sodium pyrosulfite preparation technology utilized based on feedstock circulation.
Background technology
Sodium pyrosulfite is white or yellow crystalline powder or little crystallization, with strong SO2 smells, proportion 1.4, is dissolved in
Water, the aqueous solution contact with strong acid in acidity, release SO2 and generate corresponding salt, for producing sodium hydrosulfite, sulfanilamide (SN) dimethyl
The purification of pyrimidine analgin, caprolactam etc. and chloroform, solasulfone and benzaldehyde.Photographic industry is used as the dispensing of fixer,
Perfume industry is used to produce vanillic aldehyde, as brewery industry preservative, antichlor after rubber coagulator and cotton bleaching, and You Jizhong
Mesosome, dyestuff, process hides are used as Electroplating Operations, the wastewater treatment in oil field and the dressing agent as mine etc. as reducing agent.
At present, the production of sodium pyrosulfite is typically made using sulfur dioxide and sodium carbonate liquor reaction, in preparation process
In, not only cause furnace gas largely to discharge, pollute air, and wastewater flow rate caused by preparation is big, causes environmental protection pressure big, serious shadow
Environment is rung, moreover, sulfur dioxide is made using sulfur burning, production cost is high, and profit margin is small.
The content of the invention
In order to overcome above-mentioned technical problem, it is an object of the invention to provide a kind of Jiao utilized based on feedstock circulation is sub-
Sodium sulphate preparation technology, by the design of this technique, using troilite as main material, the mode of third-order reaction is carried out, effectively
Sodium carbonate and sodium hydroxide are subjected to recovery, solve environmental pollution and wastewater flow rate be big and production cost is high asks
Topic.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of sodium pyrosulfite preparation technology utilized based on feedstock circulation, is comprised the following steps：
Step 1：Troilite is added in fluidized bed furnace, under aerobic conditions, carries out magnetic roasting, sintering temperature control
In the range of 850-900 DEG C, the furnace gas containing sulfur dioxide gas is obtained, measures volumetric concentration shared by sulfur dioxide in 10%-
In the range of 15%；
Step 2：The furnace gas that step 1 produces is entered by pipeline dry method dust is carried out in electric cleaner, after dedusting
Enter back into scrubbing tower, the cleaning solution in scrubbing tower is 5% dilution heat of sulfuric acid, and unlatching washing pump is played circulation and washed, will
Impurity in furnace gas removes；
Step 3:The gas that step 2 is obtained is incorporated into drier by pipeline, and the drier in drier is dense
Sulfuric acid, after drying sampling measure it is aqueous below 0.1%, dust-laden below 1% when to be qualified；
Step 4：The sodium carbonate liquor of recovery, the sodium carbonate liquor of recovery are added by accumulator tank into the first reactor
Solution after being absorbed for the second reactor and the 3rd reactor, will be qualified made from step 3 after furnace gas be incorporated into blower fan,
Blower fan, which is delivered to furnace gas in the first reactor by the first breather line, to be reacted, and reaction temperature is controlled in 55-60 DEG C of scope
It is interior；
Step 5：In course of reaction, excessive furnace gas is by sequentially entering into the second reactor and the 3rd reactor, and
12% sodium carbonate liquor is added in two reactors and the 3rd reactor by fresh groove respectively to absorb the furnace gas of excess, is inhaled
After receipts terminate, accumulator tank is evacuated to negative pressure state using vavuum pump, it is molten after being absorbed in the second reactor and the 3rd reactor
Liquid is evacuated in accumulator tank, is used for being reacted in the first reactor；
Step 6：When measuring that pH value reaches 3-4 in the first reactor, stop being passed through furnace gas into the first reactor, stir
10 minutes, repetition measurement PH was made the aqueous solution of sodium pyrosulfite, will be cooled to 0 DEG C in the first reactor, and stir in the range of 3-4
Mix 1 hour, sodium pyrosulfite separates out from water, by the mixture in the first reactor by centrifugal pump 14 be driven into centrifuge from
The heart is dehydrated, and is added in centrifuge and is washed with 0 DEG C of water, and washing dries 20 minutes after terminating, and Jiao in centrifuge is sub-
Sodium sulphate is delivered to after unloading in flash distillation machine, measure it is aqueous be less than 0.5% to be qualified, that is, obtain sodium pyrosulfite product；
Step 7：Furnace gas in 3rd reactor out is entered in absorption tower by pipeline, the absorbing liquid in absorption tower
For 15% sodium hydroxide solution, open absorption pump and carry out cyclic absorption, when the pH value of absorbing liquid is 6-7, absorbing liquid is passed through
Absorption pump is driven into the second reactor or the 3rd reactor, carries out recycled.
As the further scheme of the present invention：The troilite：5% dilution heat of sulfuric acid：The concentrated sulfuric acid：12% sodium carbonate is molten
Liquid：15% sodium hydroxide solution=180-200：300-340：15-18：1000-1300：1200-1500.
As the further scheme of the present invention：The furnace gas export of the fluidized bed furnace is connected to entering for electric cleaner by pipeline
Mouthful, the outlet of electric cleaner is connected on scrubbing tower by pipeline, and wash tower bottoms are connected to the import of washing pump by pipeline,
The import of washing pump is connected to the upper end of scrubbing tower by the first straight pipeline；
Scrubbing tower upper end furnace gas export is connected to drier upper end, and drier bottom is equipped with three-way pipe, on three-way pipe
It is separately installed with the first control valve and the second control valve；
Second control valve is connected to the import of blower fan by pipeline, and the outlet of blower fan is provided with gas flowmeter,
Gas flowmeter is connected with the first breather line in the first reactor by pipeline；
The first reactor lower end bottom valve is connected to the import of centrifugal pump by pipeline, and the outlet of centrifugal pump passes through pipe
Road is connected in centrifuge；
The first reactor upper end is connected to the second breather line of the second reactor by pipeline；
The second reactor upper end is connected to the 3rd breather line of the 3rd reactor by pipeline；
Second reactor and the 3rd reactor upper end are anti-by pipeline through connection to the bottom of fresh groove, second
The lower end bottom valve of kettle and the 3rd reactor is answered to be connected to the top of accumulator tank by pipeline, accumulator tank upper end is connected by pipeline
Vavuum pump is connected to, accumulator tank lower end is connected to the first reactor by pipeline；The 3rd reactor upper end is connected by pipeline
To absorption tower, absorb the bottom of the tower is connected to the import of absorption pump by pipeline, absorbs pump discharge and is provided with first be arranged side by side
Check-valves and second check-valve.
As the further scheme of the present invention：First control valve is connected to the import of electric cleaner by pipeline.
As the further scheme of the present invention：Solution of the first breather line lower end fluid-tight in the first reactor
Interior, the second breather line lower end fluid-tight is in the solution in the second reactor, and the 3rd breather line lower end fluid-tight is in the 3rd reaction
In solution in kettle.
As the further scheme of the present invention：The first check-valve is connected to the upper end on absorption tower by the second straight tube,
Second check-valve is connected to the second reactor and the 3rd reactor by pipeline.
As the further scheme of the present invention：The fluidized bed furnace, electric cleaner, scrubbing tower, filter, blower fan and centrifugation
Machine is fixed on the ground of workshop Stall, and the first reactor is fixed on the crossbeam of workshop second floor.
As the further scheme of the present invention：First reactor, the second reactor, the 3rd reactor and absorption tower
On the crossbeam of workshop second floor.
As the further scheme of the present invention：The fresh groove and accumulator tank are arranged in the steel platform in three building, workshop.
Beneficial effects of the present invention：Present invention design is simple, and the furnace gas of output carries out effective after can troilite be calcined
Absorption after reacted to obtain the sodium pyrosulfite of exquisiteness again, expand the raw material range of choice of sodium pyrosulfite, to dioxy
To change sulphur and carry out three-level absorption, fully reaction, technique is simple, high income, and the sodium hydroxide solution in absorption tower can recycle,
Simple operation, there is use and economic value well.
Brief description of the drawings
The present invention is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is a kind of sodium pyrosulfite preparation facilities structural representation utilized based on feedstock circulation of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained all other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Embodiment 1：A kind of sodium pyrosulfite preparing raw material utilized based on feedstock circulation, include the original of following parts by weight
Material：Troilite 180kg, 5% dilution heat of sulfuric acid 300kg, concentrated sulfuric acid 200kg, 12% sodium carbonate liquor 1000kg, 15% hydroxide
Sodium solution 1200kg, appropriate amount of water；
A kind of sodium pyrosulfite preparation technology utilized based on feedstock circulation, is comprised the following steps：
Step 1：Troilite is added in fluidized bed furnace 1, under aerobic conditions, carries out magnetic roasting, sintering temperature control
In the range of 850-900 DEG C, the furnace gas containing sulfur dioxide gas is obtained, obtaining volumetric concentration shared by sulfur dioxide through measurement exists
In the range of 10%-15%, the reaction equation of this step is：4FeS2+11O2→2Fe2O3+8SO2；
Step 2：The furnace gas of step 1 production is entered by pipeline dry method dust is carried out in electric cleaner 2, after dedusting
Enter back into scrubbing tower 3, the cleaning solution in scrubbing tower 3 is dilution heat of sulfuric acid, and unlatching washing pump 7 is played circulation and washed, will
Impurity in furnace gas removes；
Step 3:The gas that step 2 obtains is incorporated into drier 9 by pipeline, the drier in drier 9 is
The concentrated sulfuric acid, after drying sampling measure it is aqueous below 0.1%, dust-laden below 1% when to be qualified, if unqualified, pass through blower fan
It is re-fed into electric cleaner 2, untill qualified；
Step 4：The sodium carbonate liquor of recovery is added by accumulator tank 20 into the first reactor 5, the sodium carbonate of recovery is molten
Liquid is the solution after the second reactor 15 and the 3rd reactor 17 absorb, will be qualified made from step 3 after furnace gas be incorporated into wind
In machine 4, blower fan 4, which is delivered to furnace gas in the first reactor 5 by the first breather line 13, to be reacted, and controls the ventilation flow rate to be
10000m3/ h, reaction temperature are controlled in the range of 55-60 DEG C, and the reaction equation of this step is：Na2CO3+2SO2→Na2S2O5
+CO2；
Step 5：In course of reaction, excessive furnace gas is by sequentially entering to the second reactor 15 and the 3rd reactor 17
It is interior, stove of the fresh sodium carbonate liquor to excess is added by fresh groove 19 respectively in the second reactor 15 and the 3rd reactor 17
Gas is absorbed, and after absorption terminates, accumulator tank 20 is evacuated into negative pressure state using vavuum pump, and the second reactor 15 and the 3rd is anti-
Answer the solution after being absorbed in kettle 17 to be evacuated in accumulator tank 20, used for reaction in the first reactor 5；
Step 6：When measuring that pH value reaches 3-4 in the first reactor 5, stop being passed through furnace gas into the first reactor 5, it is multiple
PH is surveyed in the range of 3-4, the aqueous solution of sodium pyrosulfite is made, will be cooled to 0 DEG C in the first reactor 5, sodium pyrosulfite from
Separated out in water, the mixture in the first reactor 5 is driven into the centrifugal dehydration of centrifuge 6 by centrifugal pump 14, with 0 DEG C of 100L
Water be added in centrifuge 6 and washed, washing is dried 20 minutes after terminating, and the sodium pyrosulfite in centrifuge 6 is unloaded
After deliver in flash distillation machine, measure it is aqueous be less than 0.5% to be qualified, that is, obtain sodium pyrosulfite product, the weight for obtaining product is
223kg, content 0.9846；
Step 7：Furnace gas in 3rd reactor 17 out is entered in absorption tower 21 by pipeline, in absorption tower 21
Absorbing liquid is sodium hydroxide solution, opens absorption pump 22 and carries out cyclic absorption, when the pH value of absorbing liquid is 6-7, by absorbing liquid
It is driven into by absorption pump 22 in the second reactor 15 or the 3rd reactor 17, carries out recycled.
As shown in figure 1, a kind of sodium pyrosulfite preparation facilities utilized based on feedstock circulation, including fluidized bed furnace 1, electric precipitation
Device 2, scrubbing tower 3, blower fan 4, the first reactor 5 and centrifuge 6, the furnace gas export of the fluidized bed furnace 1 are connected to electricity by pipeline
The import of deduster 2, the outlet of electric cleaner 2 are connected on scrubbing tower 3 by pipeline, and the bottom of scrubbing tower 3 is connected by pipeline
To the import of washing pump 7, the import of washing pump 7 is connected to the upper end of scrubbing tower 3 by the first straight tube 8, carries out circulation washing,
Remove the impurity in furnace gas；
The upper end furnace gas export of scrubbing tower 3 is connected to the upper end of drier 9, is used to dry the water in furnace gas in drier 9
Point, the bottom of drier 9 is equipped with three-way pipe, and the first control valve 10 and the second control valve 11 are separately installed with three-way pipe, the
One control valve 10 is connected to the import of electric cleaner 2 by pipeline, for the underproof furnace gas of aqueous, dust-laden to be located again
Reason；
Second control valve 11 is connected to the import of blower fan 4 by pipeline, and the outlet of blower fan 4 is provided with gas flow
Meter 12, gas flowmeter 12 are connected with the first breather line 13 in the first reactor 5 by pipeline, under the first breather line 13
Fluid-tight is held in the solution in the first reactor 5；
The lower end bottom valve of first reactor 5 is connected to the import of centrifugal pump 14, the outlet of centrifugal pump 14 by pipeline
It is connected to by pipeline in centrifuge 6, centrifugal dehydration is carried out to sodium pyrosulfite made from reaction in the first reactor 5；
The upper end of first reactor 5 is connected to the second breather line 16 of the second reactor 15 by pipeline, and second is logical
The lower end fluid-tight of feed channel 16 is in the solution in the second reactor 15；
The upper end of second reactor 15 is connected to the 3rd breather line 18 of the 3rd reactor 17, threeway by pipeline
In solution in the 3rd reactor 17, the second reactor 15 and the 3rd reactor 17 are used to absorb the lower end fluid-tight of feed channel 18
The remaining furnace gas of reaction in first reactor 5；
Second reactor 15 and the upper end of the 3rd reactor 17 by pipeline through connection to the bottom of fresh groove 19,
Used for providing fresh sodium carbonate liquor to the second reactor 15 and the 3rd reactor 17, the second reactor 15 and the 3rd is anti-
The lower end bottom valve of kettle 17 is answered to be connected to the top of accumulator tank 20 by pipeline, the upper end of accumulator tank 20 is connected with very by pipeline
Empty pump, the lower end of accumulator tank 20 are connected to the first reactor 5 by pipeline, after the second reactor 15 and the 3rd reactor 17 are absorbed
Solution be evacuated in accumulator tank 20, for the first reactor 5 react use；
The upper end of 3rd reactor 17 is connected to absorption tower 21 by pipeline, and the absorbing liquid in absorption tower 21 is hydroxide
Sodium solution, the bottom of absorption tower 21 are connected to the import of absorption pump 22 by pipeline, and the outlet of absorption pump 22 is provided with what is be arranged side by side
First check-valve 23 and second check-valve 24, first check-valve 23 are connected to the upper end on absorption tower 21 by the second straight tube 25, use
Used in cyclic absorption, second check-valve 24 is connected to the second reactor 15 and the 3rd reactor 17 by pipeline, for that will inhale
The absorbing liquid of receipts saturation, which is delivered in the second reactor 15 and the 3rd reactor 17, is applied mechanically, and effectively saves production cost,
And reduce sewage quantity；
The fluidized bed furnace 1, electric cleaner 2, scrubbing tower 3, filter, blower fan 4 and centrifuge 6 are fixed on workshop Stall
On ground, the first reactor 5 is fixed on the crossbeam of workshop second floor；
First reactor 5, the second reactor 15, the 3rd reactor 17 and absorption tower 21 are arranged on workshop second floor
On crossbeam；
The fresh groove 19 and accumulator tank 20 are arranged in the steel platform in three building, workshop.
Embodiment 2：A kind of preparing raw material of sodium pyrosulfite, include the raw material of following parts by weight：Troilite 200kg, 5%
Dilution heat of sulfuric acid 340kg, concentrated sulfuric acid 240kg, 12% sodium carbonate liquor 1200kg, 15% sodium hydroxide solution 1350kg, water are fitted
Amount；
A kind of preparation technology of sodium pyrosulfite, comprises the following steps：
Step 1：Troilite is added in fluidized bed furnace 1, under aerobic conditions, carries out magnetic roasting, sintering temperature control
In the range of 850-900 DEG C, the furnace gas containing sulfur dioxide gas is obtained, obtaining volumetric concentration shared by sulfur dioxide through measurement exists
In the range of 10%-15%, the reaction equation of this step is：4FeS2+11O2→2Fe2O3+8SO2；
Step 2：The furnace gas of step 1 production is entered by pipeline dry method dust is carried out in electric cleaner 2, after dedusting
Enter back into scrubbing tower 3, the cleaning solution in scrubbing tower 3 is dilution heat of sulfuric acid, and unlatching washing pump 7 is played circulation and washed, will
Impurity in furnace gas removes；
Step 3:The gas that step 2 obtains is incorporated into drier 9 by pipeline, the drier in drier 9 is
The concentrated sulfuric acid, after drying sampling measure it is aqueous below 0.1%, dust-laden below 1% when to be qualified, if unqualified, pass through blower fan
It is re-fed into electric cleaner 2, untill qualified；
Step 4：The sodium carbonate liquor of recovery is added by accumulator tank 20 into the first reactor 5, the sodium carbonate of recovery is molten
Liquid is the solution after the second reactor 15 and the 3rd reactor 17 absorb, will be qualified made from step 3 after furnace gas be incorporated into wind
In machine 4, blower fan 4, which is delivered to furnace gas in the first reactor 5 by the first breather line 13, to be reacted, and controls the ventilation flow rate to be
12000m3/ h, reaction temperature are controlled in the range of 55-60 DEG C, and the reaction equation of this step is：Na2CO3+2SO2→Na2S2O5
+CO2；
Step 5：In course of reaction, excessive furnace gas is by sequentially entering to the second reactor 15 and the 3rd reactor 17
It is interior, stove of the fresh sodium carbonate liquor to excess is added by fresh groove 19 respectively in the second reactor 15 and the 3rd reactor 17
Gas is absorbed, and after absorption terminates, accumulator tank 20 is evacuated into negative pressure state using vavuum pump, and the second reactor 15 and the 3rd is anti-
Answer the solution after being absorbed in kettle 17 to be evacuated in accumulator tank 20, used for reaction in the first reactor 5；
Step 6：When measuring that pH value reaches 3-4 in the first reactor 5, stop being passed through furnace gas into the first reactor 5, it is multiple
PH is surveyed in the range of 3-4, the aqueous solution of sodium pyrosulfite is made, will be cooled to 0 DEG C in the first reactor 5, sodium pyrosulfite from
Separated out in water, the mixture in the first reactor 5 is driven into the centrifugal dehydration of centrifuge 6 by centrifugal pump 14, with 0 DEG C of 100L
Water be added in centrifuge 6 and washed, washing is dried 20 minutes after terminating, and the sodium pyrosulfite in centrifuge 6 is unloaded
After deliver in flash distillation machine, measure it is aqueous be less than 0.5% to be qualified, that is, obtain sodium pyrosulfite product, the weight for obtaining product is
248kg, content 0.9867；
Step 7：Furnace gas in 3rd reactor 17 out is entered in absorption tower 21 by pipeline, in absorption tower 21
Absorbing liquid is sodium hydroxide solution, opens absorption pump 22 and carries out cyclic absorption, when the pH value of absorbing liquid is 6-7, by absorbing liquid
It is driven into by absorption pump 22 in the second reactor 15 or the 3rd reactor 17, carries out recycled.
Present invention design is simple, and the furnace gas of output reacted again after effectively absorbing after can troilite be calcined
The sodium pyrosulfite of exquisiteness is obtained, expands the raw material range of choice of sodium pyrosulfite, three-level absorption is carried out to sulfur dioxide, filled
Divide reaction, technique is simple, high income, and the sodium hydroxide solution in absorption tower can recycle, simple operation, has good
Using and economic value.
In the description of this specification, the description of reference term " one embodiment ", " example ", " specific example " etc. means
At least one implementation of the present invention is contained in reference to specific features, structure, material or the feature that the embodiment or example describe
In example or example.In this manual, identical embodiment or example are not necessarily referring to the schematic representation of above-mentioned term.
Moreover, specific features, structure, material or the feature of description can close in any one or more embodiments or example
Suitable mode combines.
Above content is only to structure example of the present invention and explanation, affiliated those skilled in the art couple
Described specific embodiment is made various modifications or supplement or substituted using similar mode, without departing from invention
Structure surmounts scope defined in the claims, all should belong to protection scope of the present invention.
Claims (9)
1. a kind of sodium pyrosulfite preparation technology utilized based on feedstock circulation, it is characterised in that comprise the following steps：
Step 1：Troilite is added in fluidized bed furnace (1), under aerobic conditions, carries out magnetic roasting, sintering temperature control exists
In the range of 850-900 DEG C, the furnace gas containing sulfur dioxide gas is obtained, measures volumetric concentration shared by sulfur dioxide in 10%-
In the range of 15%；
Step 2：Furnace gas caused by step 1 is entered by pipeline dry method dust is carried out in electric cleaner (2), after dedusting again
Enter in scrubbing tower (3), the cleaning solution in scrubbing tower (3) is 5% dilution heat of sulfuric acid, opens washing pump (7) and plays circulation progress
Washing, the impurity in furnace gas is removed；
Step 3:The gas that step 2 obtains is incorporated into drier (9) by pipeline, the drier in drier (9) is
The concentrated sulfuric acid, after drying sampling measure it is aqueous below 0.1%, dust-laden below 1% when to be qualified；
Step 4：The sodium carbonate liquor of recovery is added in the first reactor (5) by accumulator tank (20), the sodium carbonate of recovery is molten
Liquid is the solution after the second reactor (15) and the 3rd reactor (17) absorb, will be qualified made from step 3 after furnace gas introducing
In to blower fan (4), blower fan (4), which is delivered to furnace gas in the first reactor (5) by the first breather line (13), to be reacted, and is reacted
Temperature control is in the range of 55-60 DEG C；
Step 5：In course of reaction, excessive furnace gas is by sequentially entering to the second reactor (15) and the 3rd reactor (17)
It is interior, 12% sodium carbonate liquor is added to excess by fresh groove (19) respectively in the second reactor (15) and the 3rd reactor (17)
Furnace gas absorbed, absorption terminate after, accumulator tank (20) is evacuated to negative pressure state using vavuum pump, by the second reactor (15)
It is evacuated in accumulator tank (20) with the solution after being absorbed in the 3rd reactor (17), is used for reaction in the first reactor (5)；
Step 6：When measuring the first reactor (5) interior pH value and reaching 3-4, stop being passed through furnace gas into the first reactor (5), after
After continuous stirring 10 minutes, the aqueous solution of sodium pyrosulfite is made in the range of 3-4 in repetition measurement PH, will cool in the first reactor (5)
To 0 DEG C, sodium pyrosulfite is separated out from water, and the mixture in first reactor (5) is driven into centrifuge by centrifugal pump 14
(6) centrifugal dehydration, it is added in centrifuge (6) and is washed with 0 DEG C of water, washing dries 20 minutes after terminating, by centrifuge
(6) sodium pyrosulfite in is delivered to after unloading in flash distillation machine, is dried, measure it is aqueous be less than 0.5% to be qualified, that is, obtain Jiao
Sodium sulfite product；
Step 7：Furnace gas in 3rd reactor (17) out is entered in absorption tower (21) by pipeline, in absorption tower (21)
Absorbing liquid be 15% sodium hydroxide solution, open absorption pump (22) carry out cyclic absorption, when the pH value of absorbing liquid is 6-7,
Absorbing liquid is driven into the second reactor (15) or the 3rd reactor (17) by absorption pump (22), carries out recycled.
A kind of 2. sodium pyrosulfite preparation technology utilized based on feedstock circulation according to claim 1, it is characterised in that
The troilite：5% dilution heat of sulfuric acid：The concentrated sulfuric acid：12% sodium carbonate liquor：15% sodium hydroxide solution=180-200：300-
340：200-250：1000-1300：1200-1500.
3. according to a kind of sodium pyrosulfite preparation technology utilized based on feedstock circulation described in claim 1, it is characterised in that institute
The furnace gas export for stating fluidized bed furnace (1) is connected to the import of electric cleaner (2) by pipeline, and the outlet of electric cleaner (2) passes through pipe
Road is connected on scrubbing tower (3), and scrubbing tower (3) bottom is connected to the import of washing pump (7) by pipeline, and washing pump (7) are entered
Mouth is connected to the upper end of scrubbing tower (3) by the first straight tube (8) road；
Scrubbing tower (3) upper end furnace gas export is connected to drier (9) upper end, and drier (9) bottom is equipped with three-way pipe, threeway
The first control valve (10) and the second control valve (11) are separately installed with pipe；
Second control valve (11) is connected to the import of blower fan (4) by pipeline, and the outlet of blower fan (4) is provided with gas stream
Gauge (12), gas flowmeter (12) are connected with the first breather line (13) in the first reactor (5) by pipeline；
First reactor (5) the lower end bottom valve is connected to the import of centrifugal pump (14) by pipeline, and centrifugal pump (14) go out
Mouth is connected in centrifuge (6) by pipeline；
First reactor (5) upper end is connected to the second breather line (16) of the second reactor (15) by pipeline；
Second reactor (15) upper end is connected to the 3rd breather line (18) of the 3rd reactor (17) by pipeline；
The bottom of second reactor (15) and the 3rd reactor (17) upper end by pipeline through connection to fresh groove (19)
The lower end bottom valve of portion, the second reactor (15) and the 3rd reactor (17) is connected to the top of accumulator tank (20) by pipeline
Portion, accumulator tank (20) upper end are connected with vavuum pump by pipeline, and accumulator tank (20) lower end is connected to the first reactor by pipeline
(5)；
3rd reactor (17) upper end is connected to absorption tower (21) by pipeline, and absorption tower (21) bottom is connected by pipeline
To the import of absorption pump (22), absorption pump (22) outlet is provided with the first check-valve (23) and second check-valve being arranged side by side
(24)。
4. according to a kind of sodium pyrosulfite preparation technology utilized based on feedstock circulation described in claim 3, it is characterised in that institute
State the import that the first control valve (10) is connected to electric cleaner (2) by pipeline.
5. according to a kind of sodium pyrosulfite preparation technology utilized based on feedstock circulation described in claim 3, it is characterised in that institute
The first breather line (13) lower end fluid-tight is stated in the solution in the first reactor (5), the second breather line (16) lower end fluid-tight
In solution in the second reactor (15), solution of the 3rd breather line (18) the lower end fluid-tight in the 3rd reactor (17)
It is interior.
6. according to a kind of sodium pyrosulfite preparation technology utilized based on feedstock circulation described in claim 3, it is characterised in that institute
The upper end that first check-valve (23) is connected to absorption tower (21) by the second straight tube (25) is stated, second check-valve (24) passes through pipeline
It is connected to the second reactor (15) and the 3rd reactor (17).
7. according to a kind of sodium pyrosulfite preparation technology utilized based on feedstock circulation described in claim 3, it is characterised in that institute
State fluidized bed furnace (1), electric cleaner (2), scrubbing tower (3), filter, blower fan (4) and centrifuge (6) and be fixed on workshop Stall
On ground, the first reactor (5) is fixed on the crossbeam of workshop second floor.
8. according to a kind of sodium pyrosulfite preparation technology utilized based on feedstock circulation described in claim 3, it is characterised in that institute
State the first reactor (5), the second reactor (15), the 3rd reactor (17) and absorption tower (21) are arranged on the horizontal stroke of workshop second floor
Liang Shang.
9. according to a kind of sodium pyrosulfite preparation technology utilized based on feedstock circulation described in claim 3, it is characterised in that institute
Fresh groove (19) and accumulator tank (20) is stated to be arranged in the steel platform in three building, workshop.
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Citations (3)
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|---|---|---|---|---|
| CN102659142A (en) * | 2012-04-17 | 2012-09-12 | 伍立君 | Preparation device and preparation method of sodium pyrosulfite and anhydrous sodium sulphite |
| CN203006961U (en) * | 2013-01-20 | 2013-06-19 | 伍立君 | Device for preparing sodium metabisulfite and anhydrous sodium sulfite |
| CN104211092A (en) * | 2014-08-22 | 2014-12-17 | 合肥四方磷复肥有限责任公司 | Production process for preparing sodium pyrosulfite from pyrites |
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| CN102659142A (en) * | 2012-04-17 | 2012-09-12 | 伍立君 | Preparation device and preparation method of sodium pyrosulfite and anhydrous sodium sulphite |
| CN203006961U (en) * | 2013-01-20 | 2013-06-19 | 伍立君 | Device for preparing sodium metabisulfite and anhydrous sodium sulfite |
| CN104211092A (en) * | 2014-08-22 | 2014-12-17 | 合肥四方磷复肥有限责任公司 | Production process for preparing sodium pyrosulfite from pyrites |
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Application publication date: 20180313 |