CN106185834B - The method and system of secondary salt in a kind of extraction desulfurization waste liquor - Google Patents
The method and system of secondary salt in a kind of extraction desulfurization waste liquor Download PDFInfo
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- CN106185834B CN106185834B CN201610556950.1A CN201610556950A CN106185834B CN 106185834 B CN106185834 B CN 106185834B CN 201610556950 A CN201610556950 A CN 201610556950A CN 106185834 B CN106185834 B CN 106185834B
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Abstract
The present invention provides it is a kind of extraction desulfurization waste liquor in secondary salt method and system, the method includes：The desulfurization waste liquor is filtered, filtered fluid is obtained；Activated carbon is added in every liter of filtered fluid, 30~150min of decoloration is carried out to the filtered fluid under 25~45 DEG C of bleaching temperature, obtains clear liquid；Crystallization is evaporated to the clear liquid using low-pressure steam, obtains magma；For the cooling magma to 50~70 DEG C, acquisition contains K2S2O3、K2S and K2CO3Mixed salt；Under 22~35 DEG C of extraction temperature, the mixed salt is extracted using extractant, obtains K respectively2S2O3、K2S and K2CO3Secondary salt product；In this way, the low-pressure steam that system generates can be obtained K as dried medium to desulfurization waste liquor evaporative crystallization2S2O3、K2CO3、K2The secondary salts product such as S, is effectively utilized coking system waste heat, realizes the recycling of heat, reduces production cost；And this method is simple for process, realizes zero discharging of waste liquid, avoids pollution environment.
Description
Technical field
The invention belongs to a kind of method and system of secondary salt in environmental technology field more particularly to extraction desulfurization waste liquor.
Background technology
Coal chemical enterprise will produce a large amount of coke-stove gas in coking production, the hydrogen sulfide (H contained in coke-stove gas2S)、
Hydrogen cyanide (HCN) and its combustion product are all the main matters to form acid rain.Meanwhile in steel smelting procedure, high-quality steel
The rolling of material, the combustion gas sulfur-bearing being used for also have higher requirement.Therefore pure coke-stove gas in order to obtain, it is necessary to by coal
Contain a certain amount of H in gas2S and HCN removings.
It is usually directly to absorb the H in coke-stove gas using solution of potassium carbonate at present2The sour gas such as S and HCN, after absorption
Potassium carbonate lean solution of the potassium carbonate rich solution after vacuum analysis absorb acid in coal gas again by returning again to absorption tower after heat exchange
Property gas.To ensure doctor solution quality, also periodically outer partial desulfurization waste liquid can be arranged in the system desulfurization regeneration cyclic process, this is
Non-renewable salt, such as K are generated since side reaction can occur in sweetening process2S2O3, K2CO3、KSCN、K2SO4Deng.The waste liquid
COD, S containing high concentration2-、CN-, phenol, the pollutants such as oils, direct emission will generate high risks to environment.Therefore, it needs
The high-concentration desulfurized liquid externally arranged recycles or after treatment as waste processing.
In the prior art, include mainly following methods when handling desulfurization waste liquor：First method is directly discharged to coal yard
Dust suppression, coal blending etc. are handled, but sulfur-containing compound bringing into production system again can be caused sulfur-containing compound refining by this method
Continuous cycle during coke；Desulfurization waste liquor is sent to ammonia still process by second method, is generated with other workshop sections of coke-oven plant useless
Water is sent into sewage-treatment plant together.But the disadvantages of this method is by the valuable ingredient containing potassium salt compound in desulfurization waste liquor
It is handled as waste, and increases wastewater treatment expense.The third method will be sent desulfurization waste liquor to large-scale waste water
In exposure pond, it is evaporated and is transferred out as solid refuse as after solid particle naturally.But on the one hand this method takes up a large area,
There is phenomenon of osmosis when another aspect, ambient enviroment is polluted.Fourth method is that desulfurization waste liquor is directly used in quenching, this
Sample will cause coke sulfur content to rise, and influence coke quality.
It is in the prior art to solve at present there is an urgent need for a kind of method of secondary salt in novel extraction desulfurization waste liquor based on this
The above problem.
Invention content
In view of the problems of the existing technology, an embodiment of the present invention provides a kind of methods of secondary salt in extraction desulfurization waste liquor
And system, it is low to the secondary salt value obtained after the processing of desulfurization waste liquor in the prior art to solve, it can not be recycled；And
Handle the complex process of desulfurization waste liquor, the high technical problem of processing cost.
The present invention provides a kind of method for extracting secondary salt in desulfurization waste liquor, the method includes：
The desulfurization waste liquor is filtered, filtered fluid is obtained；
Activated carbon is added in the filtered fluid, decoloration 30 is carried out to the filtered fluid under 25~45 DEG C of bleaching temperature
~150min obtains clear liquid；
Crystallization is evaporated to the clear liquid using low-pressure steam, obtains magma；
For the cooling magma to 50~70 DEG C, acquisition contains K2S2O3、K2S and K2CO3Mixed salt；
Under 22~35 DEG C of extraction temperature, the mixed salt is extracted using extractant, obtains K respectively2S2O3、K2S
And K2CO3Secondary salt product.
In said program, 5~15g activated carbons, preferred weight 10g are added in every liter of desulfurization waste liquor.
In said program, the preferred bleaching temperature is 35 DEG C, and preferably bleaching time is 90min, and preferably cooling temperature is
60 DEG C, preferably extraction temperature is 30 DEG C.
In said program, extraction is carried out to the mixed salt using extractant and is specifically included：
The extractant is mixed with the magma, 15~45min is stirred, the extract liquor and the magma is filled
Divide dissolving, extract and filter；Wherein, preferably mixing time is 20min.
In said program, the extractant is specially that volume ratio is 1：1~5:1 ethanol water.
In said program, the mixed salt is extracted using extractant, obtains K respectively2S2O3、K2S and K2CO3Secondary salt produces
After product, the method further includes：
Extract liquor is concentrated using the low-pressure steam of 0.3~0.8MPa, obtains magma；
The magma is filtered and dried, K is obtained2S2O3、K2S、K2CO3With KSCN solids.
In said program, when being evaporated crystallization to the clear liquid using low-pressure steam, the pressure of the low-pressure steam is
0.8~2.5MPa.
The present invention also provides it is a kind of extraction desulfurization waste liquor in secondary salt system, the system comprises：
One end of first filter device, first filter device is connected with one end of decoloration device, described for filtering
Desulfurization waste liquor obtains filtered fluid；
Decoloration device, the other end of the decoloration device are connected with one end of the first vaporising device, for utilizing activated carbon,
30~150min of decoloration is carried out to the filtered fluid at a temperature of 25~45 DEG C, obtains clear liquid；
The other end of first vaporising device, first vaporising device is connected with one end of extraction equipment, low for utilizing
Pressure steam is evaporated crystallization to the clear liquid, obtains magma；And the cooling magma, to 50~70 DEG C, acquisition contains
K2S2O3、K2S and K2CO3Mixed salt；
Extraction equipment, the extraction equipment is used under 22~35 DEG C of extraction temperature, using extractant to the mixed salt
It is extracted, obtains K respectively2S2O3、K2S and K2CO3Secondary salt product.
In said program, the extraction equipment carries out extraction to the mixed salt using extractant and specifically includes：
The extractant is mixed with the magma using the extraction equipment, 15~45min is stirred, by the extraction
Liquid is fully dissolved, extracts and is filtered with the magma；Wherein, preferably mixing time is 30min；The extractant is specially body
Product is than being 1：1~5:1 ethanol water.
In said program, the system also includes：
One end of second vaporising device, second vaporising device is connected with the other end of the extraction equipment, for profit
Extract liquor is concentrated with the low-pressure steam of 0.3~0.8MPa, obtains magma.
Second filter device, one end of second filter device are connected with the other end of second vaporising device, use
In filtering the magma, K is obtained2S2O3、K2S、K2CO3With the crystal of KSCN；
Drying device, one end of the drying device are connected with the other end of second filter device, are used for drying
K2S2O3、K2S、K2CO3With the crystal of KSCN, K is obtained2S2O3、K2S、K2CO3With KSCN solids.
The present invention provides it is a kind of extraction desulfurization waste liquor in secondary salt method and system, the method includes：Described in filtering
Desulfurization waste liquor obtains filtered fluid；Activated carbon is added in the filtered fluid, to the filtering under 25~45 DEG C of bleaching temperature
Liquid carries out 30~150min of decoloration, obtains clear liquid；Crystallization is evaporated to the clear liquid using low-pressure steam, obtains magma；
For the cooling magma to 50~70 DEG C, acquisition contains K2S2O3、K2S and K2CO3Mixed salt；In 22~35 DEG C of extraction temperature
Under, the mixed salt is extracted using extractant, obtains K respectively2S2O3、K2S and K2CO3Secondary salt product；In this way, system generates
Low-pressure steam K can be obtained to desulfurization waste liquor evaporative crystallization as dried medium2S2O3、K2CO3、K2The secondary salts product such as S, effectively
Coking system waste heat is utilized, realizes the recycling of heat, reduces production cost；And this method is simple for process, realizes zero
Discharging of waste liquid avoids pollution environment.
Description of the drawings
Fig. 1 is the method flow schematic diagram of secondary salt in extraction desulfurization waste liquor provided by the invention；
Fig. 2 is the apparatus structure schematic diagram of secondary salt in extraction desulfurization waste liquor provided by the invention.
Specific implementation mode
It is worth in order to which the secondary salt obtained after the processing to desulfurization waste liquor can be improved, the technique for simplifying processing desulfurization waste liquor,
Reduce processing cost, the present invention provides it is a kind of extraction desulfurization waste liquor in secondary salt method and system, the method includes：Filtering
The desulfurization waste liquor obtains filtered fluid；5~15g/L activated carbons are added in the filtered fluid, it is right at a temperature of 25~45 DEG C
The filtered fluid carries out 30~150min of decoloration, obtains clear liquid；The clear liquid is carried out using the low-pressure steam of 0.8~2.5MPa
Evaporative crystallization obtains magma；For the cooling magma to 50~70 DEG C, acquisition contains K2S2O3、K2S and K2CO3Mixed salt；?
Under 22~35 DEG C of extraction temperature, the mixed salt is extracted using extractant, obtains K respectively2S2O3、K2S and K2CO3Secondary salt
Product.
Technical scheme of the present invention is described in further detail below by drawings and the specific embodiments.
The present invention provides a kind of method for extracting secondary salt in desulfurization waste liquor, as shown in Figure 1, the method includes following steps
Suddenly：
Step 110, the desulfurization waste liquor is filtered, filtered fluid is obtained.
In this step, desulfurization waste liquor is filtered using the first filter device, removes the solid impurity in desulfurization waste liquor
Obtain filtered fluid.Wherein, the solid impurity may include coal dust, carbon dust, oil and suspended matter etc., and first filter device can
To include：Fast grade filter paper or filter etc..
Step 111, activated carbon is added in every liter of filtered fluid, the filtered fluid is taken off at a temperature of 25~45 DEG C
30~150min of color obtains clear liquid.
In this step, after getting filtered fluid, filtered fluid is flowed into decoloration device, activity is added in filtered fluid
Charcoal is stirred the filtered fluid at a temperature of 25~45 DEG C, decolourize 30~150min, acquisition clear liquid.Wherein, every liter
It can be 5~15g that the weight of activated carbon is added in filtrate, it is therefore preferable to 6g, 10g, 11g or 14g；The bleaching temperature preferably may be used
Think 30~40 DEG C；Preferred point is 35 DEG C；The bleaching time preferably can be 30,60,90 or 150min.The active charcoal bag
It includes：Jet coal activated carbon, anthracite activated carbon, lignite activated carbon or cocoanut active charcoal；Preferably, it is cocoanut active charcoal.
Step 112, the low-pressure steam utilized is evaporated crystallization to the clear liquid, obtains magma.
In this step, clear liquid is flowed into first vaporising device, the waste heat low-pressure steam generated using coking system
The clear liquid is evaporated crystallization, when the clear liquid is concentrated into 250~300mL, forms a concentration of 90% desulfurization waste liquor, and
Having crystal to be precipitated becomes magma.Wherein, the pressure of the low-pressure steam is 0.8~2.5MPa, and temperature is 180 DEG C, from clear liquid
In the waste water that generates during the condensate moisture that evaporates be discharged into storage tank, flow into coking biochemical processing system and carry out at waste water
Reason.
After getting magma, the magma is cooled down using 50~70 DEG C of warm water, you can acquisition contains
K2S2O3、K2S and K2CO3Mixed salt crude product.Wherein, cooling temperature is preferably 55~65 DEG C, and preferred point is 60 DEG C.
Step 113, under 22~35 DEG C of extraction temperature, the mixed salt is extracted using extractant, is obtained respectively
K2S2O3、K2S and K2CO3Secondary salt product.
In this step, when getting containing K2S2O3、K2S and K2CO3Mixed salt crude product after, using extraction equipment for described
Mixed salt crude product is extracted, and each secondary salt product is obtained.
Specifically, under 22~35 DEG C of extraction temperature, extractant is mixed with the magma, fully dissolve, stir,
After being filtered using filter device, K is obtained respectively2S2O3、K2S and K2CO3The insoluble product of secondary salt obtains after drying drying is cooling
To K2S2O3、K2S and K2CO3Secondary salt product.Wherein, extraction temperature is preferably 25~30 DEG C, and preferred point is 30 DEG C.
Wherein, it is 1 that the extractant, which is specially volume ratio,：1~5:1 ethanol water, every liter of desulfurization waste liquor obtain
To magma in be added 2L extractants；The ethanol water ratio is preferably 1:1,2:1,3:1,4:1 or 5:1.
Here, when obtaining K2S2O3、K2S and K2CO3After secondary salt product, the method further includes：Second vaporising device utilizes
The waste heat low-pressure steam of 0.3~0.8MPa concentrates extract liquor, obtains magma；The volume of the magma can be with
For 150~200mL；After being filtered, detach to magma using filter or filter paper, K is obtained respectively2S2O3、K2S、K2CO3
The insoluble product with KSCN secondary salts obtains K after drying drying is cooling2S2O3、K2S、K2CO3With KSCN secondary salt solid products.Its
In, filtered liquid is a small amount of ethanol water, and filtered liquid can also be sent into the first vaporising device and carried out
It recycles.
The present invention also provides a kind of systems of secondary salt in extraction desulfurization waste liquor, as shown in Fig. 2, the system comprises：First
Filter device 21, decoloration device 22, the first vaporising device 23 and extraction equipment 24；Wherein,
One end of the filter device 21 is connected with one end of decoloration device 22, miscellaneous for removing the solid in desulfurization waste liquor
Matter, oil and suspended matter etc. filter the desulfurization waste liquor, obtain filtered fluid；Wherein, the solid impurity may include coal dust, carbon
Powder, oil and suspended matter etc., the filter device 21 may include：Fast grade filter paper or filter etc..
The other end of the decoloration device 22 is connected with one end of the first vaporising device 23, the activated carbon for utilizing,
30~150min of decoloration is carried out to every liter of filtered fluid at a temperature of 25~45 DEG C, obtains clear liquid.Specifically, when getting filtered fluid
Afterwards, by filtered fluid flow into decoloration device 22 in, in filtered fluid be added 5~15g/L activated carbons, it is therefore preferable to 6g, 10g, 11g or
14g；The filtered fluid is stirred at a temperature of 25~45 DEG C, decolourize 30~150min, acquisition clear liquid.Wherein, described
Bleaching temperature preferably can be 30~40 DEG C；Preferred point is 35 DEG C；The bleaching time preferably can be 30,60,90 or
150min.The activated carbon includes：Jet coal activated carbon, anthracite activated carbon, lignite activated carbon or cocoanut active charcoal；This implementation
It is cocoanut active charcoal in example.The decoloration device 22 is specially the kettle that decolourizes, and first vaporising device 23 can be evaporator.
After the clear liquid flows into the first vaporising device 23, first vaporising device 23 is generated using coking system
Waste heat low-pressure steam described in clear liquid be evaporated crystallization, when the clear liquid is concentrated into 250mL, formed a concentration of 90% it is de-
Sulphur waste liquid, and there is crystal to be precipitated as magma.Wherein, the pressure of the low-pressure steam is 0.8~2.5MPa, temperature 180
DEG C, the waste water generated during the condensate moisture evaporated in clear liquid is discharged into storage tank, flow into coking biochemical processing system into
Row wastewater treatment.
After getting magma, the magma is cooled down using 50~70 DEG C of warm water, you can acquisition contains
K2S2O3、K2S and K2CO3Mixed salt crude product.
When getting containing K2S2O3、K2S and K2CO3Mixed salt crude product after, it is thick for the mixed salt using extraction equipment 24
Product are extracted, and each secondary salt product is obtained.The other end of one end of the extraction equipment 24 and first vaporising device 23
It is connected, the extraction equipment 24 is used under 22~35 DEG C of extraction temperature, and extractant is mixed with the magma, fully molten
Solution, stirring after being filtered using filter device, obtain K respectively2S2O3、K2S and K2CO3The insoluble product of secondary salt, drying drying are cold
But after, K is obtained2S2O3、K2S and K2CO3Secondary salt product, wherein extraction temperature is preferably 25~30 DEG C, and preferred point is 30 DEG C.Institute
It can be extracter to state extraction equipment 24.The extractant is specially that volume ratio is 1：1~5:1 ethanol water；It is described every
It rises and 2L extractants is added in the magma that desulfurization waste liquor obtains；The ethanol water ratio is preferably 1:1,2:1,3:1,4:
1 or 5:1.
Here, the system also includes：Second vaporising device 25, the second filter device 26 and drying device 27；Described
One end of two vaporising devices 25 is connected with the other end of the extraction equipment 24, for the low pressure using 0.3~0.8MPa
Steam concentrates extract liquor, obtains magma.One end of second filter device 26 and second vaporising device 25
The other end be connected, for filtering the magma, obtain K2S2O3、K2S、K2CO3With the crystal of KSCN；The drying device 27
One end be connected with the other end of second filter device 26, for drying K2S2O3、K2S、K2CO3With the crystal of KSCN, obtain
Take K2S2O3、K2S、K2CO3With KSCN solids.Wherein, second vaporising device 25 can be evaporator, the second filtering dress
It can be filter or filter paper to set 26；The drying device 27 is specifically as follows baking oven.
The device of secondary salt, has fully recycled K in extraction desulfurization waste liquor provided in this embodiment2S2O3、K2CO3、K2The pairs such as S
Salt is sold as inorganic salts, there is certain economic value and environmental benefit；Zero discharge is realized, simple for process, cost
It is low, it is environmentally friendly；While handling desulfurization waste liquor, it is effectively utilized coking system waste heat, realizes the recycling of heat, is dropped
Low production cost.
Embodiment one
In practical application, when being handled the desulfurization waste liquor in the present embodiment using square law device provided by the invention,
Detailed process is as follows：
1L desulfurization waste liquors are filtered using the first filter device, remove the solid impurity in desulfurization waste liquor, oil and are hanged
Float etc. obtains filtered fluid.Wherein, first filter device may include：Fast grade filter paper or filter etc.；The solid is miscellaneous
Matter includes：Coal dust and carbon dust.
After getting filtered fluid, filtered fluid is flowed into decoloration device, 15g activated carbons are added in filtered fluid, 25
The filtered fluid is stirred at a temperature of DEG C, decolourize 30min, acquisition clear liquid.The activated carbon includes：Cocoanut active charcoal.
Clear liquid is flowed into first vaporising device, using coking system generate waste heat low-pressure steam described in clear liquid into
Row evaporative crystallization forms a concentration of 90% desulfurization waste liquor when clear liquid concentration is 250mL, and has crystal precipitation to become
Magma.Wherein, the waste water generated during the condensate moisture evaporated in clear liquid is discharged into storage tank, is flowed at coking biochemical
Reason system carries out wastewater treatment.Wherein, the pressure of the low-pressure steam is 0.8MPa, and temperature is 180 DEG C.
After getting magma, the magma is cooled down using 50 DEG C of warm water, you can acquisition contains K2S2O3、
K2S and K2CO3Mixed salt crude product.
When getting containing K2S2O3、K2S and K2CO3Mixed salt crude product after, using extraction equipment for the mixed salt crude product
It is extracted, obtains each secondary salt product.
Specifically, under 25 DEG C of extraction temperature, 2L extractants are mixed with the magma, fully dissolving, stirring
15min, after being filtered using filter device, K is obtained respectively2S2O3、K2S and K2CO3The insoluble product of secondary salt, drying drying cooling
Afterwards, K is obtained2S2O3、K2S and K2CO3Secondary salt product.After testing, K2S2O3Content 34.7%, K2CO3Content 43.6%, K2S contents
16.5%.Wherein, it is 1 that the extractant, which is specially volume ratio,：1 ethanol water.
Here, when obtaining K2S2O3、K2S and K2CO3After secondary salt product, the method further includes：Second vaporising device utilizes
The waste heat low-pressure steam of 0.8MPa concentrates extract liquor, obtains magma；The volume of the magma can be
150mL；After being filtered, detach to magma using the second filter device, K is obtained respectively2S2O3、K2S、K2CO3With KSCN pairs
The insoluble product of salt obtains K after drying drying is cooling2S2O3、K2S、K2CO3With KSCN secondary salt solid products.Wherein, it filters
Liquid afterwards is a small amount of ethanol water, and filtered liquid can also be sent into the first vaporising device and carry out cycle profit
With.Detection, K2S2O3Content 66.7%, K2CO3Content 21.6%, K2S contents 7.5%, KSCN contents are 0.9%.
In the present embodiment using method and device provided by the invention to desulfurization waste liquor carry out secondary salt extraction, can obtain compared with
The secondary salt product of high concentration, has fully recycled K2S2O3、K2CO3、K2The secondary salts such as S are sold as inorganic salts, there is certain economic valence
Value and environmental benefit；Zero discharge is realized, simple process and low cost is environmentally friendly；In the same of processing desulfurization waste liquor
When, it is effectively utilized coking system waste heat, the recycling of heat is realized, reduces production cost.
Embodiment two
In practical application, desulfurization waste liquor in the present embodiment is handled using method and device provided by the invention
When, detailed process is as follows：
1L desulfurization waste liquors are filtered using the first filter device, remove the solid impurity in desulfurization waste liquor, oil and are hanged
Float etc. obtains filtered fluid.Wherein, first filter device may include：Fast grade filter paper or filter etc.；The solid is miscellaneous
Matter includes：Coal dust, carbon dust.
After getting filtered fluid, filtered fluid is flowed into decoloration device, 10g activated carbons are added in filtered fluid, 35
The filtered fluid is stirred at a temperature of DEG C, decolourize 90min, acquisition clear liquid.The activated carbon includes：Cocoanut active charcoal.
Clear liquid is flowed into first vaporising device, the waste heat low-pressure steam generated using coking system, the clear liquid
Be evaporated crystallization, when the clear liquid concentration be 250mL when, formed a concentration of 90% desulfurization waste liquor, and have crystal be precipitated at
For magma.Wherein, the pressure of the low-pressure steam is 0.8MPa, 180 DEG C of temperature, the condensate moisture mistake evaporated from clear liquid
The waste water generated in journey is discharged into storage tank, is flowed into coking biochemical processing system and is carried out wastewater treatment.
After getting magma, the magma is cooled down using 60 DEG C of warm water, you can acquisition contains K2S2O3、
K2S and K2CO3Mixed salt crude product.
When getting containing K2S2O3、K2S and K2CO3Mixed salt crude product after, using extraction equipment for the mixed salt crude product
It is extracted, obtains each secondary salt product.
Specifically, under 26 DEG C of extraction temperature, 2L extractants are mixed with the magma, fully dissolving, stirring
20min, after being filtered using filter device, K is obtained respectively2S2O3、K2S and K2CO3The insoluble product of secondary salt, drying drying cooling
Afterwards, K is obtained2S2O3、K2S and K2CO3Secondary salt product.After testing, K2S2O3Content 35.3%, K2CO3Content 44.2%, K2S contents
17.1%.Wherein, it is 3 that the extractant, which is specially volume ratio,：1 ethanol water.
Here, when obtaining K2S2O3、K2S and K2CO3After secondary salt product, the method further includes：Second vaporising device utilizes
0.8MPa, 180 DEG C of the waste heat low-pressure steam concentrate extract liquor, obtain magma；The volume of the magma can
Think 150mL；After being filtered, detach to magma using the second filter device, K is obtained respectively2S2O3、K2S、K2CO3With
The insoluble product of KSCN secondary salts obtains K after drying drying is cooling2S2O3、K2S、K2CO3With KSCN secondary salt solid products.Its
In, filtered liquid is a small amount of ethanol water, and filtered liquid can also be sent into the first vaporising device and carried out
It recycles.Detection, K2S2O3Content 69.1%, K2CO3Content 19.3%, K2S contents 5.4%, KSCN contents are 1.5%.
In the present embodiment using method and device provided by the invention to desulfurization waste liquor carry out secondary salt extraction, can obtain compared with
The secondary salt product of high concentration, has fully recycled K2S2O3、K2CO3、K2The secondary salts such as S are sold as inorganic salts, there is certain economic valence
Value and environmental benefit；Zero discharge is realized, simple process and low cost is environmentally friendly；In the same of processing desulfurization waste liquor
When, it is effectively utilized coking system waste heat, the recycling of heat is realized, reduces production cost.
Embodiment three
In practical application, desulfurization waste liquor in the present embodiment is handled using method and device provided by the invention
When, detailed process is as follows：
1L desulfurization waste liquors are filtered using the first filter device, remove the solid impurity oil in desulfurization waste liquor and are suspended
Object etc. obtains filtered fluid.Wherein, first filter device may include：Fast grade filter paper or filter etc.；The solid impurity
Including：Coal dust and carbon dust.
After getting filtered fluid, filtered fluid is flowed into decoloration device, 5g activated carbons are added in filtered fluid, at 45 DEG C
At a temperature of the filtered fluid is stirred, decolourize 150min, obtain clear liquid.The activated carbon includes：Cocoanut active charcoal.
Clear liquid is flowed into first vaporising device, using coking system generate waste heat low-pressure steam described in clear liquid into
Row evaporative crystallization forms a concentration of 90% desulfurization waste liquor when clear liquid concentration is 250mL, and has crystal precipitation to become
Magma.Wherein, the pressure of the low-pressure steam is 1.5MPa, and temperature is 180 DEG C；The condensate moisture mistake evaporated from clear liquid
The waste water generated in journey is discharged into storage tank, is flowed into coking biochemical processing system and is carried out wastewater treatment.
After getting magma, the magma is cooled down using 70 DEG C of warm water, you can acquisition contains K2S2O3、
K2S and K2CO3Mixed salt crude product.
When getting containing K2S2O3、K2S and K2CO3Mixed salt crude product after, using extraction equipment for the mixed salt crude product
It is extracted, obtains each secondary salt product.
Specifically, under 27 DEG C of extraction temperature, 2L extractants are mixed with the magma, fully dissolving, stirring
20min, after being filtered using filter device, K is obtained respectively2S2O3、K2S and K2CO3The insoluble product of secondary salt, drying drying cooling
Afterwards, K is obtained2S2O3、K2S and K2CO3Secondary salt product.After testing, K2S2O3Content 30.4%, K2CO3Content 45.6%, K2S contents
15.7%.Wherein, it is 5 that the extractant, which is specially volume ratio,：1 ethanol water.
Here, when obtaining K2S2O3、K2S and K2CO3After secondary salt product, the method further includes：Second vaporising device utilizes
0.8MPa, 180 DEG C of the waste heat low-pressure steam concentrate extract liquor, obtain magma；The volume of the magma can
Think 150mL；After being filtered, detach to magma using the second filter device, K is obtained respectively2S2O3、K2S、K2CO3With
The insoluble product of KSCN secondary salts obtains K after drying drying is cooling2S2O3、K2S、K2CO3With KSCN secondary salt solid products.Its
In, filtered liquid is a small amount of ethanol water, and filtered liquid can also be sent into the first vaporising device and carried out
It recycles.Detection, K2S2O3Content 67.2%, K2CO3Content 20.8%, K2S contents 2.4%, KSCN contents are 0.7%.
In the present embodiment using method and device provided by the invention to desulfurization waste liquor carry out secondary salt extraction, can obtain compared with
The secondary salt product of high concentration, has fully recycled K2S2O3、K2CO3、K2The secondary salts such as S are sold as inorganic salts, there is certain economic valence
Value and environmental benefit；Zero discharge is realized, simple process and low cost is environmentally friendly；In the same of processing desulfurization waste liquor
When, it is effectively utilized coking system waste heat, the recycling of heat is realized, reduces production cost.
Example IV
In practical application, desulfurization waste liquor in the present embodiment is handled using method and device provided by the invention
When, detailed process is as follows：
1L desulfurization waste liquors are filtered using the first filter device, remove the solid impurity oil in desulfurization waste liquor and are suspended
Object etc. obtains filtered fluid.Wherein, first filter device may include：Fast grade filter paper or filter etc.；The solid impurity
Including：Coal dust and carbon dust.
After getting filtered fluid, filtered fluid is flowed into decoloration device, 6g activated carbons are added in filtered fluid, at 36 DEG C
At a temperature of the filtered fluid is stirred, decolourize 60min, obtain clear liquid.The activated carbon includes：Cocoanut active charcoal.
Clear liquid is flowed into first vaporising device, using coking system generate waste heat low-pressure steam described in clear liquid into
Row evaporative crystallization forms a concentration of 90% desulfurization waste liquor when clear liquid concentration is 250mL, and has crystal precipitation to become
Magma.Wherein, the pressure of the low-pressure steam is 1.8MPa, and temperature is 180 DEG C；The condensate moisture mistake evaporated from clear liquid
The waste water generated in journey is discharged into storage tank, is flowed into coking biochemical processing system and is carried out wastewater treatment.
After getting magma, the magma is cooled down using 58 DEG C of warm water, you can acquisition contains K2S2O3、
K2S and K2CO3Mixed salt crude product.
When getting containing K2S2O3、K2S and K2CO3Mixed salt crude product after, using extraction equipment for the mixed salt crude product
It is extracted, obtains each secondary salt product.
Specifically, under 30 DEG C of extraction temperature, 2L extractants are mixed with the magma, fully dissolving, stirring
25min, after being filtered using filter device, K is obtained respectively2S2O3、K2S and K2CO3The insoluble product of secondary salt, drying drying cooling
Afterwards, K is obtained2S2O3、K2S and K2CO3Secondary salt product.After testing, K2S2O3Content 35.4%, K2CO3Content 44.6%, K2S contents
15.9%.Wherein, it is 4 that the extractant, which is specially volume ratio,：1 ethanol water.
Here, when obtaining K2S2O3、K2S and K2CO3After secondary salt product, the method further includes：Second vaporising device utilizes
0.5MPa, 180 DEG C of the waste heat low-pressure steam concentrate extract liquor, obtain magma；The volume of the magma can
Think 150mL；After being filtered, detach to magma using the second filter device, K is obtained respectively2S2O3、K2S、K2CO3With
The insoluble product of KSCN secondary salts obtains K after drying drying is cooling2S2O3、K2S、K2CO3With KSCN secondary salt solid products.Its
In, filtered liquid is a small amount of ethanol water, and filtered liquid can also be sent into the first vaporising device and carried out
It recycles.Detection, K2S2O3Content 66.5%, K2CO3Content 20.5%, K2S contents 6.4%, KSCN contents are 0.8%.
In the present embodiment using method and device provided by the invention to desulfurization waste liquor carry out secondary salt extraction, can obtain compared with
The secondary salt product of high concentration, has fully recycled K2S2O3、K2CO3、K2The secondary salts such as S are sold as inorganic salts, there is certain economic valence
Value and environmental benefit；Zero discharge is realized, simple process and low cost is environmentally friendly；In the same of processing desulfurization waste liquor
When, it is effectively utilized coking system waste heat, the recycling of heat is realized, reduces production cost.
Embodiment five
In practical application, when being handled the desulfurization waste liquor in the present embodiment using square law device provided by the invention,
Detailed process is as follows：
1L desulfurization waste liquors are filtered using the first filter device, remove the solid impurity in desulfurization waste liquor, oil and are hanged
Float etc. obtains filtered fluid.Wherein, first filter device may include：Fast grade filter paper or filter etc.；The solid is miscellaneous
Matter includes：Coal dust and carbon dust.
After getting filtered fluid, filtered fluid is flowed into decoloration device, 15g activated carbons are added in filtered fluid, 30
The filtered fluid is stirred at a temperature of DEG C, decolourize 80min, acquisition clear liquid.The activated carbon includes：Cocoanut active charcoal.
Clear liquid is flowed into first vaporising device, using coking system generate waste heat low-pressure steam described in clear liquid into
Row evaporative crystallization forms a concentration of 90% desulfurization waste liquor when clear liquid concentration is 250mL, and has crystal precipitation to become
Magma.Wherein, the waste water generated during the condensate moisture evaporated in clear liquid is discharged into storage tank, is flowed at coking biochemical
Reason system carries out wastewater treatment.Wherein, the pressure of the low-pressure steam is 2.0MPa, and temperature is 180 DEG C.
After getting magma, the magma is cooled down using 65 DEG C of warm water, you can acquisition contains K2S2O3、
K2S and K2CO3Mixed salt crude product.
When getting containing K2S2O3、K2S and K2CO3Mixed salt crude product after, using extraction equipment for the mixed salt crude product
It is extracted, obtains each secondary salt product.
Specifically, under 31 DEG C of extraction temperature, 2L extractants are mixed with the magma, fully dissolving, stirring
23min, after being filtered using filter device, K is obtained respectively2S2O3、K2S and K2CO3The insoluble product of secondary salt, drying drying cooling
Afterwards, K is obtained2S2O3、K2S and K2CO3Secondary salt product.After testing, K2S2O3Content 33.7%, K2CO3Content 41.3%, K2S contents
15.2%.Wherein, it is 2 that the extractant, which is specially volume ratio,：1 ethanol water.
Here, when obtaining K2S2O3、K2S and K2CO3After secondary salt product, the method further includes：Second vaporising device utilizes
The waste heat low-pressure steam of 0.5MPa concentrates extract liquor, obtains magma；The volume of the magma can be
150mL；After being filtered, detach to magma using the second filter device, K is obtained respectively2S2O3、K2S、K2CO3With KSCN pairs
The insoluble product of salt obtains K after drying drying is cooling2S2O3、K2S、K2CO3With KSCN secondary salt solid products.Wherein, it filters
Liquid afterwards is a small amount of ethanol water, and filtered liquid can also be sent into the first vaporising device and carry out cycle profit
With.Detection, K2S2O3Content 65.7%, K2CO3Content 20.8%, K2S contents 7.1%, KSCN contents are 0.8%.
In the present embodiment using method and device provided by the invention to desulfurization waste liquor carry out secondary salt extraction, can obtain compared with
The secondary salt product of high concentration, has fully recycled K2S2O3、K2CO3、K2The secondary salts such as S are sold as inorganic salts, there is certain economic valence
Value and environmental benefit；Zero discharge is realized, simple process and low cost is environmentally friendly；In the same of processing desulfurization waste liquor
When, it is effectively utilized coking system waste heat, the recycling of heat is realized, reduces production cost.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention, it is all
All any modification, equivalent and improvement made by within the spirit and principles in the present invention etc. should be included in the protection of the present invention
Within the scope of.
Claims (10)
1. a kind of method of secondary salt in extraction desulfurization waste liquor, which is characterized in that the method includes：
The desulfurization waste liquor is filtered, filtered fluid is obtained；
Activated carbon is added in the filtered fluid, under 25~45 DEG C of bleaching temperature to the filtered fluid carry out decoloration 30~
150min obtains clear liquid；
The waste heat low-pressure steam generated using coking system is evaporated crystallization to the clear liquid, obtains magma；
For the cooling magma to 50~70 DEG C, acquisition contains K2S2O3、K2S and K2CO3Mixed salt；
Under 22~35 DEG C of extraction temperature, the mixed salt is extracted using extractant, obtains K respectively2S2O3、K2S and
K2CO3Secondary salt product.
2. the method as described in claim 1, which is characterized in that 5~15g activated carbons are added in every liter of desulfurization waste liquor.
3. the method as described in claim 1, which is characterized in that the preferred bleaching temperature is 35 DEG C, and preferably bleaching time is
90min, preferably cooling temperature are 60 DEG C, and preferably extraction temperature is 30 DEG C.
4. the method as described in claim 1, which is characterized in that carry out extraction to the mixed salt using extractant and specifically include：
The extractant is mixed with the magma, stirs 15~45min, the extract liquor and the magma is fully molten
It solves, extract and filter.
5. method as claimed in claim 4, which is characterized in that the extractant is specially that volume ratio is 1：1~5:1 ethyl alcohol
Aqueous solution.
6. method as claimed in claim 4, which is characterized in that extracted to the mixed salt using extractant, obtained respectively
K2S2O3、K2S and K2CO3After secondary salt product, the method further includes：
Extract liquor is concentrated using the low-pressure steam of 0.3~0.8MPa, obtains magma；
The magma is filtered and dried, K is obtained2S2O3、K2S、K2CO3With KSCN solids.
7. the method as described in claim 1, which is characterized in that when being evaporated crystallization to the clear liquid using low-pressure steam,
The pressure of the low-pressure steam is 0.8~2.5MPa.
8. the system of secondary salt in a kind of extraction desulfurization waste liquor, which is characterized in that the system comprises：
One end of first filter device, first filter device is connected with one end of decoloration device, for filtering the desulfurization
Waste liquid obtains filtered fluid；
Decoloration device, the other end of the decoloration device are connected with one end of the first vaporising device, for utilizing activated carbon, 25
30~150min of decoloration is carried out to the filtered fluid at a temperature of~45 DEG C, obtains clear liquid；
The other end of first vaporising device, first vaporising device is connected with one end of extraction equipment, for utilizing coking system
The waste heat low-pressure steam generated of uniting is evaporated crystallization to the clear liquid, obtains magma；And the cooling magma to 50~
70 DEG C, acquisition contains K2S2O3、K2S and K2CO3Mixed salt；
Extraction equipment, the extraction equipment are used under 22~35 DEG C of extraction temperature, are carried out to the mixed salt using extractant
Extraction, obtains K respectively2S2O3、K2S and K2CO3Secondary salt product.
9. system as claimed in claim 8, which is characterized in that the extraction equipment extracts the mixed salt using extractant
It takes and specifically includes：
The extractant is mixed with the magma using the extraction equipment, stir 15~45min, by the extract liquor with
The magma is fully dissolved, is extracted and filters；Wherein, it is 1 that the extractant, which is specially volume ratio,：1~5:1 ethyl alcohol is water-soluble
Liquid.
10. system as claimed in claim 8, which is characterized in that the system also includes：
One end of second vaporising device, second vaporising device is connected with the other end of the extraction equipment, for utilizing 0.3
The low-pressure steam of~0.8MPa concentrates extract liquor, obtains magma；
Second filter device, one end of second filter device are connected with the other end of second vaporising device, were used for
The magma is filtered, K is obtained2S2O3、K2S、K2CO3With the crystal of KSCN；
Drying device, one end of the drying device is connected with the other end of second filter device, for drying K2S2O3、
K2S、K2CO3With the crystal of KSCN, K is obtained2S2O3、K2S、K2CO3With KSCN solids.
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