CN106216360A - A kind of refined and resource utilization method of side-product salt - Google Patents
A kind of refined and resource utilization method of side-product salt Download PDFInfo
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- CN106216360A CN106216360A CN201610669567.7A CN201610669567A CN106216360A CN 106216360 A CN106216360 A CN 106216360A CN 201610669567 A CN201610669567 A CN 201610669567A CN 106216360 A CN106216360 A CN 106216360A
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- 150000003839 salts Chemical class 0.000 title claims abstract description 89
- 239000006227 byproduct Substances 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 30
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 51
- 238000005336 cracking Methods 0.000 claims abstract description 25
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 19
- 239000012535 impurity Substances 0.000 claims abstract description 17
- 239000002912 waste gas Substances 0.000 claims abstract description 16
- 238000005342 ion exchange Methods 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000005516 engineering process Methods 0.000 claims description 22
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 16
- 229910001424 calcium ion Inorganic materials 0.000 claims description 16
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 14
- 229910001422 barium ion Inorganic materials 0.000 claims description 14
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 10
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 7
- 159000000009 barium salts Chemical class 0.000 claims description 6
- 229920001429 chelating resin Polymers 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 6
- 238000000197 pyrolysis Methods 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- XDFCIPNJCBUZJN-UHFFFAOYSA-N barium(2+) Chemical compound [Ba+2] XDFCIPNJCBUZJN-UHFFFAOYSA-N 0.000 claims description 2
- 230000003197 catalytic effect Effects 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 238000004064 recycling Methods 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000003556 assay Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 16
- 239000000126 substance Substances 0.000 description 15
- 235000011121 sodium hydroxide Nutrition 0.000 description 13
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 12
- 239000000575 pesticide Substances 0.000 description 10
- 239000001257 hydrogen Substances 0.000 description 9
- 229910052739 hydrogen Inorganic materials 0.000 description 9
- 239000000047 product Substances 0.000 description 9
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 8
- 239000000460 chlorine Substances 0.000 description 8
- 238000002425 crystallisation Methods 0.000 description 8
- 230000008025 crystallization Effects 0.000 description 8
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 5
- 229910052801 chlorine Inorganic materials 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 150000002431 hydrogen Chemical class 0.000 description 5
- 239000012528 membrane Substances 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 4
- 229910000366 copper(II) sulfate Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 150000002500 ions Chemical group 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 239000013049 sediment Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 239000002910 solid waste Substances 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 231100000614 poison Toxicity 0.000 description 3
- 230000007096 poisonous effect Effects 0.000 description 3
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000003317 industrial substance Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J6/00—Heat treatments such as Calcining; Fusing ; Pyrolysis
- B01J6/008—Pyrolysis reactions
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides the refined of a kind of side-product salt and resource utilization method, comprise the following steps: the side-product salt of certain mass is placed in microwave cracking stove by (1)；(2) Waste gas outlet is set on microwave cracking stove；(3) waste gas that Waste gas outlet is discharged enters heat exchanger；(4) waste gas through heat exchanger connects emission-control equipment；(5) the side-product salt after processing in step (1) detects；(6) it is dissolved in pure water, remove impurity by step (5) detects qualified side-product salt；(7) salt after remove impurity is dissolved into into electrolysis with ion-exchange film；(8) after electrolysis with ion-exchange film, H can be obtained2、Cl2And NaOH.Resource utilization degree of the present invention is the highest, and technological process is simple, it is not necessary to carry out the discriminating of danger wastes, directly by its recycling, can remove major part assay expense from, it is achieved automated production, easy and simple to handle.
Description
Technical field
The present invention be directed to the refined and recycling of the side-product salt of the production technology generation of the industry such as pesticide, medicine
Technology, forms a kind of new resource and is used, belong to field of environment protection.
Background technology
At present, the industry such as China's Coal Chemical Industry, pesticide, dyestuff produces substantial amounts of dirty salt, and annual output is in terms of million tons, and lacks
Suitably process approach less.Containing substantial amounts of poisonous and hazardous Organic substance in these abraum salts, and with penetrating odor, typically quilt
It is useless that local environmental administration regards as danger.The side-product salt that pesticide industry produces is being listed in endanger and is being given up by national correlation department at present
In register, it is not necessary to identify directly as dangerous solid waste.Because there is no clear and definite standard or guidance method, because it produces
Raw amount is big, kind is many, complicated component, intractability big, becomes the difficult problem of environmental protection that industry is urgently to be resolved hurrily, and present relevant enterprise uses
Mode be build storehouse keep in, has there is " swell-warehouse " phenomenon in Some Enterprises.
In recent years, the problem of side-product salt also causes government and the highest attention of society.Pesticide by-product abraum salt is pesticide row
Industry is measured the solid waste of maximum, containing various poisonous and harmful substances, complicated.Simultaneously because moisture is high, easily lump,
It is difficult to be effectively addressed and utilize.Salt is a kind of important industrial chemicals, is also extremely valuable national strategy resource, reclaims
Utilize pesticide by-product abraum salt as raw material of industry salt, be possible not only to eliminate the pollution to environment, it is also possible to make full use of preciousness
Salt resource, by by-product resource, it is achieved recycling economy.
In terms of side-product salt treatment, conventional technology is incineration technology, the most under the high temperature conditions, by side-product salt
Organic substance decomposes, gasifies, aoxidizes, and the most serious poisonous and harmful substance is removed under the high temperature conditions.This is a kind of process pair
A kind of technology that product salt is more effective and feasible, on market, existing processing method makes the high temperature such as employing incinerator, rotary kiln
Treatment technology.But, these technology there is also a series of problem in actual application, is mainly manifested in following
Aspect:
1, side-product salt is bonded on equipment inner wall, causes equipment not use.Side-product salt itself has certain moisture content,
When the equipment such as incinerator, rotary kiln of entrance, easy to stick on the inwall of equipment under the effect of high temperature, and Organic substance is decomposing
During complicated component, reaction during also can produce tool sticking Organic substance, side-product salt can be made firmer
Be bonded on equipment inner wall, labor cleaning cannot be carried out, and ultimately causes the device space not enough, and equipment can not be again with,
So that finally the falling into disuse of equipment.
2, heating uneven, treatment effeciency is low.When the recycling equipment such as incinerator, rotary kiln burns, these equipment are adding
It is all the mode using local heating during heat, through conduction of heat, all of side-product salt is heated to design temperature.This
The mode of heating of sample can make the heating-up temperature of side-product salt uneven, causes local temperature too high or local temperature is too low shows
As, ultimately result in the Organic substance in side-product salt and decompose not exclusively, it is impossible to thoroughly oxidation operation is decomposed, cause treatment effect
The best.
3, the side-product salt after processing is difficult to recycling.Although the salt after process becomes general solid waste, but still
It is a kind of Litter, not by its recycling, causes a certain degree of wasting of resources, and the process of general solid waste also needs
Expense that will be higher.After side-product salt is calcined, it is main for carrying substantial amounts of insoluble matter, mainly black in side-product salt secretly, and place
Manage improper if having a kind of zest taste.Therefore, the side-product salt of calcining is had no idea as material uses such as Snow Agent.
Summary of the invention
The problem existed for prior art, patent of the present invention discloses the microwave cracking technology of a kind of side-product salt, can
To solve to heat uneven, stamping device and the problem of recycling.BROAD SUMMARY is as follows:
Refined and the resource utilization method of a kind of side-product salt, comprises the following steps:
(1) the side-product salt of certain mass is placed in microwave cracking stove, microwave cracking stove controls temperature at 200-700 DEG C of model
In enclosing, pyrolysis time is 1-6h；
(2) during step (1) heats, have waste gas and produce, microwave cracking stove arranges Waste gas outlet；
(3) waste gas that Waste gas outlet in step (2) is discharged is entered heat exchanger, heat will be taken away with hot blast or the shape of liquid
Formula carries out reuse；
(4) in step (3) through the waste gas connection emission-control equipment of heat exchanger；
(5) the side-product salt after processing in step (1) detects so that it is the organic concentration in side-product salt is reduced to
Below 10ppm；
(6) being dissolved in pure water by detecting qualified side-product salt in step (5), the concentration of salt is between 200-350g/L, by solution
Carry out remove impurity；
(7) saline solution after remove impurity in step (6) is detected so that it is after reaching the standard of chlor-alkali salt, saline solution
Enter electrolysis with ion-exchange film；
(8) after step (7) electrolysis with ion-exchange film, H can be obtained2、Cl2And NaOH solution, H2、Cl2It is collected respectively,
NaOH solution derives and enters crystallizing evaporator, obtains NaOH solid.
Finally, by side-product salt recycling.
Preferably, during step (1) microwave cracking, temperature controls at 400-600 degree；
Preferably, the time of step (1) microwave cracking is 2-4h；
Preferably, during step (1) microwave cracking, device bottom carries out the motion of non-rotating, prevents side-product salt
During cracking, solidify in bulk, heat uneven phenomenon and produce；
Preferably, during step (1) microwave cracking, device bottom carries out wave, formula the most straggly motion；
Preferably, in step (3) heat exchanger, heat reuse form is the form of hot blast；
Preferably, step (4) uses catalytic oxidation technologies, combustion technology and plasma technique in emission-control equipment.
Preferably, in step (6), impurity removal process includes: clarifies → adds barium salt and remove SO4 2-Ion → addition Na2CO3Remove
Ba2+、Ca2+→ enter chelating resin removal Ca2+、Mg2+；
Preferably, the H collected in step (7)2、Cl2Resynthesis HCl.
The beneficial effect of patent of the present invention:
(1) homogeneous heating, treatment effeciency is high.The maximum feature of microwave heating is that microwave produces inside heating object, heat
Source, from interior of articles, homogeneous heating, does not results in the half-cooked phenomenon of " not yet done in outer Jiao ", simultaneously because " heating the most simultaneously "
Substantially reducing heat time heating time, the efficiency of heating surface is high.Therefore, the technology of microwave heating is used can quickly to rise to temperature require temperature
Degree, and it is uneven not have heating, the problem that organic matter removal is uneven, has the strongest creativeness.
(2) equipment is non-caked, and floor space is little.Use the rotary kiln device of common mode of heating, it may appear that side-product
The granule of salt is bonded on equipment, and along with the prolongation of the time of use, the phenomenon of equipment bonding can be more and more heavier.Employing microwave adds
Thermal technology, owing to heating technique itself is uniform, it is not necessary to significantly overturning, therefore side-product salt will not concentrate at equipment
On, solve existing existing problems under common heating mode.Additionally, general industry firing equipment is bigger, occupation of land is many, around ring
Border temperature is the highest, and operator's labor condition is poor, and intensity is big.And microwave heating floor space is little, it is to avoid high ambient temperature,
The labor condition of workman has obtained greatly improving.
(3) equipment is provided with heat reclamation set, increases heat utilization rate.The heat major part that microwave cracking stove produces is
Taking away with the form of waste gas, therefore connect heat exchanger at Waste gas outlet, heat exchanger transfers heat on other materials (such as sky
Gas), it is being passed in microwave cracking stove (with the form reuse of hot blast) by the material of absorption heat, thus is realizing returning of heat
With, increase heat utilization rate, reduce the waste of energy, thus reduce the processing cost of by-product salt.
(4) directly by side-product salt recycling.In the technology of the present invention, directly side-product is refined to chlor-alkali salt
Standard, use electrolysis with ion-exchange film technology, make sodium chloride salt become highly purified NaOH solid and hydrogen, chlorine etc. money
Source, it is achieved the recycling of side-product salt.The NaOH purity obtained by electrolysis with ion-exchange film more than 99%, can meet chemical fibre,
The industries such as the pharmacy prescription to high-purity Caustic soda；The high generally purity of chlorine gas feeding of purity of chlorine gas feeding, more than 99%, is that good organochlorine is raw
Produce raw material；The high generally hydrogen purity of hydrogen purity > 99%, can be directly used for requiring the occasion of High Purity Hydrogen.Therefore, the technology of the present invention
Its resource utilization degree is the highest, has significant novelty.
(5) whole technological process is simple, and operation can realize automatization.In whole technological process, from the essence of side-product salt
System, to generating highly purified, the resource of resourcebility utilization, is a kind of quantity-produced technique, can realize the automatization produced.
In whole technique, by being refined to electrolysis with ion-exchange film, it is not necessary to carry out the discriminating of danger wastes, directly by its resource profit
With, major part assay expense can be removed from, it is achieved automated production, easy and simple to handle.
Detailed description of the invention
Below in conjunction with detailed description of the invention, it is further elucidated with the present invention, it should be understood that following detailed description of the invention is only used for
The bright present invention rather than restriction the scope of the present invention.
Embodiment 1
The technological process of the present invention is as it is shown in figure 1, the side-product salt of this experiment employing is from certain pesticide chemical company, and it is mainly
The side-product salt (once filtering salt) produced in Cupric sulfate production technology, is mainly composed of sodium chloride salt.Sample moisture content is left 12%
The right side, organic concentration is higher.Weighing the side-product salt of certain mass, be placed in microwave cracking stove, arranging temperature is 400 DEG C, splits
The solution time is 4h, and its treatment effect is as shown in table 1.
Table 1 experiment processes analytical data
Remarks: data are to be dissolved in 10g dry weight side-product in 100ml pure water recording.
By data in table 1 it can be seen that after microwave cracking, the salt Organic substance in side-product is already below detection
Blank, illustrate that Organic substance the most all decomposes, treatment effect is excellent.
Being dissolved in detecting qualified salt in the solution of certain volume, in solution, salt concentration is 305g/L, by dissolved
Saline solution carries out remove impurity.
(1) clarify, filter.Containing a large amount of water-fast silts, carbons compound in the salt dissolved, need by these not
Molten thing is removed.
(2) sulfate ion is removed.In solution, add barium salt, time sulfate ion and barium ions form barium sulfate and sink
Form sediment, thus remove sulfate ion by the form of solid-liquid separation；
(3) calcium ion, barium ions are removed.Sodium carbonate is added, to remove calcium ion and the barium ions of excess in solution；
(4) deliming, magnesium ion are removed.Make solution pass through chelating resin, make calcium ions and magnesium ions be adsorbed onto on resin, and then remove it.
Solution after remove impurity detects so that it is the content of each factor is in the critical field entering electrolysis with ion-exchange film.Change
Test result as shown in table 2.
The detection data of the factor and standard value after table 2 remove impurity
By the data in table 2 it can be seen that the index of every factor has all reached the standard of the saline solution of electrolysis with ion-exchange film, therefore
Next step ion-membrane electrolysis device can be entered.
Detect qualified solution and enter ion-membrane electrolysis device, device is carried out the collection system of hydrogen, chlorine respectively, anti-
Only explode.The sodium hydroxide solution produced is derived, and enters evaporated crystallization device, obtains highly purified hydrogen by evaporative crystallization
Sodium oxide solid.The purity of every product has the most all reached the standard of Related product, can carry out recycling.
Embodiment 2
The side-product salt that this experiment uses is from certain pesticide chemical company, and it is mainly in Cupric sulfate production technology the by-product produced
Savor salt (once filtering salt), be mainly composed of sodium chloride salt.Sample moisture content is about 12%, and organic concentration is higher.Weigh certain
The side-product salt of quality, is placed in microwave cracking stove, and arranging temperature is 600 DEG C, and pyrolysis time is 2h, by molten for salt qualified for detection
In the solution of certain volume, in solution, salt concentration is 200g/L, and the saline solution dissolved is carried out remove impurity.
(1) clarify, filter.Containing a large amount of water-fast silts, carbons compound in the salt dissolved, need by these not
Molten thing is removed.
(2) sulfate ion is removed.In solution, add barium salt, time sulfate ion and barium ions form barium sulfate and sink
Form sediment, thus remove sulfate ion by the form of solid-liquid separation；
(3) calcium ion, barium ions are removed.Sodium carbonate is added, to remove calcium ion and the barium ions of excess in solution；
(4) deliming, magnesium ion are removed.Make solution pass through chelating resin, make calcium ions and magnesium ions be adsorbed onto on resin, and then remove it.
Solution after remove impurity detects so that it is the content of each factor is in the critical field entering electrolysis with ion-exchange film.Inspection
Survey qualified solution and enter ion-membrane electrolysis device, device is carried out the collection system of hydrogen, chlorine respectively, prevents quick-fried
Fried.The sodium hydroxide solution produced is derived, and enters evaporated crystallization device, obtains highly purified sodium hydroxide by evaporative crystallization solid
Body.The purity of every product has the most all reached the standard of Related product, can carry out recycling.
Embodiment 3
The side-product salt that this experiment uses is from certain pesticide chemical company, and it is mainly in Cupric sulfate production technology the by-product produced
Savor salt (once filtering salt), be mainly composed of sodium chloride salt.Sample moisture content is about 12%, and organic concentration is higher.Weigh certain
The side-product salt of quality, is placed in microwave cracking stove, and arranging temperature is 200 DEG C, and pyrolysis time is 6h, by molten for salt qualified for detection
In the solution of certain volume, in solution, salt concentration is 350g/L, and the saline solution dissolved is carried out remove impurity.
(1) clarify, filter.Containing a large amount of water-fast silts, carbons compound in the salt dissolved, need by these not
Molten thing is removed.
(2) sulfate ion is removed.In solution, add barium salt, time sulfate ion and barium ions form barium sulfate and sink
Form sediment, thus remove sulfate ion by the form of solid-liquid separation；
(3) calcium ion, barium ions are removed.Sodium carbonate is added, to remove calcium ion and the barium ions of excess in solution；
(4) deliming, magnesium ion are removed.Make solution pass through chelating resin, make calcium ions and magnesium ions be adsorbed onto on resin, and then remove it.
Solution after remove impurity detects so that it is the content of each factor is in the critical field entering electrolysis with ion-exchange film.Inspection
Survey qualified solution and enter ion-membrane electrolysis device, device is carried out the collection system of hydrogen, chlorine respectively, prevents quick-fried
Fried.The sodium hydroxide solution produced is derived, and enters evaporated crystallization device, obtains highly purified sodium hydroxide by evaporative crystallization solid
Body.The purity of every product has the most all reached the standard of Related product, can carry out recycling.
Embodiment 4
The side-product salt that this experiment uses is from certain pesticide chemical company, and it is mainly in Cupric sulfate production technology the by-product produced
Savor salt (once filtering salt), be mainly composed of sodium chloride salt.Sample moisture content is about 12%, and organic concentration is higher.Weigh certain
The side-product salt of quality, is placed in microwave cracking stove, and arranging temperature is 700 DEG C, and pyrolysis time is 1h, by molten for salt qualified for detection
In the solution of certain volume, in solution, salt concentration is 280g/L, and the saline solution dissolved is carried out remove impurity.
(1) clarify, filter.Containing a large amount of water-fast silts, carbons compound in the salt dissolved, need by these not
Molten thing is removed.
(2) sulfate ion is removed.In solution, add barium salt, time sulfate ion and barium ions form barium sulfate and sink
Form sediment, thus remove sulfate ion by the form of solid-liquid separation；
(3) calcium ion, barium ions are removed.Sodium carbonate is added, to remove calcium ion and the barium ions of excess in solution；
(4) deliming, magnesium ion are removed.Make solution pass through chelating resin, make calcium ions and magnesium ions be adsorbed onto on resin, and then remove it.
Solution after remove impurity detects so that it is the content of each factor is in the critical field entering electrolysis with ion-exchange film.Inspection
Survey qualified solution and enter ion-membrane electrolysis device, device is carried out the collection system of hydrogen, chlorine respectively, prevents quick-fried
Fried.The sodium hydroxide solution produced is derived, and enters evaporated crystallization device, obtains highly purified sodium hydroxide by evaporative crystallization solid
Body.The purity of every product has the most all reached the standard of Related product, can carry out recycling.
Technological means disclosed in the present invention program is not limited only to the technological means disclosed in above-mentioned embodiment, also includes
The technical scheme being made up of above technical characteristic combination in any.It should be pointed out that, for those skilled in the art
For, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (9)
1. the refined and resource utilization method of a side-product salt, it is characterised in that comprise the following steps:
(1) the side-product salt of certain mass is placed in microwave cracking stove, microwave cracking stove controls temperature at 200-700 DEG C of model
In enclosing, pyrolysis time is 1-6h；
(2) during step (1) heats, have waste gas and produce, microwave cracking stove arranges Waste gas outlet；
(3) waste gas that Waste gas outlet in step (2) is discharged is entered heat exchanger, heat will be taken away with hot blast or the shape of liquid
Formula carries out reuse；
(4) in step (3) through the waste gas connection emission-control equipment of heat exchanger；
(5) the side-product salt after processing in step (1) detects so that it is the organic concentration in side-product salt is reduced to
Below 10ppm；
(6) being dissolved in pure water by detecting qualified side-product salt in step (5), the concentration of salt is between 200-350g/L, by solution
Carry out remove impurity；
(7) saline solution after remove impurity in step (6) is detected so that it is after reaching the standard of chlor-alkali salt, saline solution
Enter electrolysis with ion-exchange film；
(8) after step (7) electrolysis with ion-exchange film, H can be obtained2、Cl2And NaOH solution, H2、Cl2It is collected respectively, NaOH
Solution is derived and is entered crystallizing evaporator, obtains NaOH solid.
2. the refined and resource utilization method of side-product salt as claimed in claim 1, it is characterised in that described step (1)
During middle microwave cracking, temperature controls at 400-600 DEG C.
3. the refined and resource utilization method of side-product salt as claimed in claim 1, it is characterised in that described step (1)
The time of middle microwave cracking is 2-4h.
4. the refined and resource utilization method of side-product salt as claimed in claim 1, it is characterised in that in described step
(1), in during microwave cracking, device bottom carries out the motion of non-rotating.
5. the refined and resource utilization method of side-product salt as claimed in claim 1, it is characterised in that in described step
(1), in during microwave cracking, device bottom carries out wave, formula the most straggly motion.
6. the refined and resource utilization method of side-product salt as claimed in claim 1, it is characterised in that described step (3)
In middle heat exchanger, heat reuse form is the form of hot blast.
7. the refined and resource utilization method of side-product salt as claimed in claim 1, it is characterised in that described step (4)
Middle emission-control equipment uses catalytic oxidation technologies, combustion technology and plasma technique.
8. the refined and resource utilization method of side-product salt as claimed in claim 1, it is characterised in that described step (6)
Middle impurity removal process includes: clarifies → adds barium salt and remove SO4 2-Ion → addition Na2CO3Remove Ba2+、Ca2+→ enter chelating resin
Remove Ca2+、Mg2+。
9. the refined and resource utilization method of side-product salt as claimed in claim 1, it is characterised in that described step (7)
The H of middle collection2、Cl2Resynthesis HCl.
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| CN106801874A (en) * | 2017-01-18 | 2017-06-06 | 中国科学院过程工程研究所 | A kind of processing method of industrial waste salt |
| CN107098363A (en) * | 2017-04-28 | 2017-08-29 | 中国科学院过程工程研究所 | A kind of processing method of industrial waste salt |
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| CN111847480A (en) * | 2020-05-26 | 2020-10-30 | 南京工业大学 | Purification treatment and resource recycling method for industrial sodium chloride waste salt |
| CN112536000A (en) * | 2020-11-18 | 2021-03-23 | 安徽同速环保科技有限公司 | Method for treating waste salt containing sodium dodecyl benzene sulfonate through microwave thermal cracking |
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