CN113233477A - Method for recovering industrial-grade sodium chloride by using industrial waste salt - Google Patents
Method for recovering industrial-grade sodium chloride by using industrial waste salt Download PDFInfo
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- CN113233477A CN113233477A CN202110545806.9A CN202110545806A CN113233477A CN 113233477 A CN113233477 A CN 113233477A CN 202110545806 A CN202110545806 A CN 202110545806A CN 113233477 A CN113233477 A CN 113233477A
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 title claims abstract description 130
- 150000003839 salts Chemical class 0.000 title claims abstract description 67
- 239000011780 sodium chloride Substances 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000002440 industrial waste Substances 0.000 title claims abstract description 32
- 239000002699 waste material Substances 0.000 claims abstract description 70
- 239000000706 filtrate Substances 0.000 claims abstract description 40
- 239000012535 impurity Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- MHAJPDPJQMAIIY-UHFFFAOYSA-N hydrogen peroxide Substances OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 22
- 230000003647 oxidation Effects 0.000 claims abstract description 21
- 239000008367 deionised water Substances 0.000 claims abstract description 15
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 15
- 238000001914 filtration Methods 0.000 claims abstract description 13
- 239000003463 adsorbent Substances 0.000 claims abstract description 12
- 239000000243 solution Substances 0.000 claims abstract description 11
- 238000010791 quenching Methods 0.000 claims abstract description 10
- 230000000171 quenching effect Effects 0.000 claims abstract description 10
- 239000012266 salt solution Substances 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 8
- 230000001699 photocatalysis Effects 0.000 claims abstract description 4
- 230000002195 synergetic effect Effects 0.000 claims abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 21
- 238000001179 sorption measurement Methods 0.000 claims description 18
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 9
- 235000013162 Cocos nucifera Nutrition 0.000 claims description 7
- 244000060011 Cocos nucifera Species 0.000 claims description 7
- 229910021642 ultra pure water Inorganic materials 0.000 claims description 7
- 239000012498 ultrapure water Substances 0.000 claims description 7
- 230000035484 reaction time Effects 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920001429 chelating resin Polymers 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 239000005416 organic matter Substances 0.000 description 14
- 238000000605 extraction Methods 0.000 description 10
- 238000004064 recycling Methods 0.000 description 5
- 230000001590 oxidative effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000002101 nanobubble Substances 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 229910052740 iodine Inorganic materials 0.000 description 2
- 239000011630 iodine Substances 0.000 description 2
- -1 iron ions Chemical class 0.000 description 2
- CXKWCBBOMKCUKX-UHFFFAOYSA-M methylene blue Chemical compound [Cl-].C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 CXKWCBBOMKCUKX-UHFFFAOYSA-M 0.000 description 2
- 229960000907 methylthioninium chloride Drugs 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 description 1
- 239000004155 Chlorine dioxide Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 235000019398 chlorine dioxide Nutrition 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910000365 copper sulfate Inorganic materials 0.000 description 1
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 1
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 229910001410 inorganic ion Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000010812 mixed waste Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 235000021110 pickles Nutrition 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001172 regenerating effect Effects 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
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/14—Purification
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
- C01D3/08—Preparation by working up natural or industrial salt mixtures or siliceous minerals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Abstract
The invention belongs to the technical field of recovering sodium chloride from industrial waste salt, and discloses a method for recovering industrial-grade sodium chloride by using industrial waste salt, which comprises the steps of firstly burning the waste salt to obtain a waste material A, putting the waste material A into deionized water for water quenching and dissolving to obtain a waste salt solution, then filtering the waste salt solution, and removing insoluble substances to obtain primary filtrate; performing photocatalytic oxidation by adopting an ultraviolet light-hydrogen peroxide system or an ultraviolet light-ozone synergistic system to react organic matters in the primary filtrate to obtain secondary filtrate; and removing impurities in the secondary filtrate by using an adsorbent to obtain a sodium chloride solution. The invention solves the problems that the existing method for extracting sodium chloride from industrial waste salt has poor effect of removing organic matters in the industrial waste salt, so that the purity of the extracted sodium chloride is low and the industrial use standard is not met.
Description
Technical Field
The invention belongs to the field of recycling sodium chloride from industrial waste salt, and particularly relates to a method for recycling industrial-grade sodium chloride from industrial waste salt.
Background
The industrial waste salt is waste containing a large amount of sodium chloride generated in industrial production, and is generated in many industries at present, for example, in the process of producing preserved szechuan pickle, a large amount of salt-containing wastewater is generated, and after the salt-containing wastewater is subjected to primary treatment, waste salt containing organic matters is formed. Because the waste salt contains a large amount of sodium chloride and organic matters, if the waste salt is directly discarded, the waste salt can cause bad influence on the environment and waste of the sodium chloride. Therefore, at present, the waste salt is treated, and sodium chloride in the waste salt is extracted to realize resource recycling.
At present, the extraction of sodium chloride from industrial waste salt mainly comprises the following two ways:
the Chinese patent with patent publication No. CN110372013A is a method for preparing refined industrial salt by using industrial waste salt, which burns the waste salt at 550-1200 deg.C to volatilize the organic substances in the waste salt, thus completing the extraction of sodium chloride. However, in this way, the organic matters in the waste salt cannot be completely treated, so that the extracted sodium chloride is mixed with the organic matters, and the subsequent use of the sodium chloride is affected.
In the treatment process of the mixed waste salt chemical oxidation method disclosed in the Chinese patent with the patent publication number of CN111468515A, hydrogen peroxide or sodium persulfate or chlorine dioxide is used as an oxidant, copper chloride, copper sulfate or copper nitrate is used as an oxidation promoter, and the mixture reacts with organic matters in the waste salt through the introduction of the oxidant and the oxidation promoter, so that the extraction of sodium chloride is completed. This method does not completely react the organic substances in the waste salt and also introduces new impurities, resulting in the extraction of sodium chloride that is not satisfactory for industrial use.
The existing method for extracting sodium chloride from industrial waste salt has poor effect of removing organic matters in the waste salt, and new impurities are introduced, so that the purity of the extracted sodium chloride is low, and the sodium chloride is difficult to recycle.
Disclosure of Invention
The invention aims to provide a method for recovering industrial-grade sodium chloride by using industrial waste salt, which aims to solve the problems that the existing method for extracting sodium chloride from industrial waste salt has poor effect of removing organic matters in the industrial waste salt, so that the purity of the extracted sodium chloride is low and the industrial use standard is not met.
In order to achieve the purpose, the invention provides the following technical scheme, which comprises the following steps:
step one, burning
Incinerating the waste salt at 650-950 ℃ for 30-120 min to obtain waste A;
step two, water quenching and dissolving
Putting the waste A into deionized water for water quenching and dissolving to obtain a waste salt solution, filtering the waste salt solution, and removing insoluble substances to obtain primary filtrate;
step three, advanced oxidation
Performing photocatalytic oxidation by adopting an ultraviolet light-hydrogen peroxide system or an ultraviolet light-ozone synergistic system to react organic matters in the primary filtrate to obtain secondary filtrate;
step four, deep adsorption
And (4) adding an adsorbent into the secondary filtrate to remove impurities in the secondary filtrate to obtain a sodium chloride solution.
The technical principle and the beneficial effects of the technical scheme are as follows:
through burning the industrial waste salt, can get rid of most TOC class organic matter impurity in the industrial waste salt, rethread water quenching dissolves and further filters out the insoluble substance, and then gets rid of the impurity in the waste salt. The method utilizes an ultraviolet light-hydrogen peroxide system or ultraviolet light-ozone in cooperation with photocatalytic oxidation to react with organic matters in primary filtrate, and is matched with an adsorbent to adsorb organic matter impurities in secondary filtrate obtained after reaction, so that the purity of the formed sodium chloride solution is improved, the residue of the organic matters is reduced, and the method can be suitable for industrial application.
According to the technical scheme, the waste salt is treated in multiple steps, organic impurities in the waste salt can be removed, the extraction of sodium chloride is completed, and new impurities cannot be introduced in the extraction process, so that the purity of the extracted sodium oxide is high, and the method is suitable for industrial application.
By burning the waste salt, most TOC organic matter impurities in the waste salt can be removed; dissolving with water to remove insoluble impurities, adding calcium carbonate into the primary filtrate, performing precipitation displacement reaction under alkaline heating condition to remove most of phosphorus impurities, and filtering to remove precipitate; and the secondary filtrate is adsorbed by an adsorption column, the phosphorus concentration is further reduced, other impurities are removed, the adsorbed column-passing solution is subjected to evaporation crystallization to obtain industrial-grade sodium chloride, and the resource recycling of the waste salt is realized.
Further, in the first step, a fixed bed incinerator, a rotary kiln incinerator, a regenerative incinerator, a plasma high-temperature furnace, a muffle furnace or a microwave oven is used for incineration.
Has the advantages that: through setting up the equipment that burns and use, can accomplish the abundant burning of waste salt, get rid of most organic matter.
Further, in the second step, the ratio of the waste material A to the deionized water is 1: 3-10.
Has the advantages that: the waste material A and the deionized water are proportioned, so that the sodium chloride in the waste material A can be fully dissolved, the condition of crystalline salt is avoided, and the waste of the sodium chloride in the filtering process can be reduced.
Further, in the third step, an ultraviolet light-hydrogen peroxide system adopts 254nm, 25W ultraviolet lamp tubes, 81 lamp tubes are arranged for every cubic meter of filtrate, and the lamp tubes are arranged according to a 9X9 mode; the concentration of hydrogen peroxide is 30%, and the primary filtrate is proportioned according to 0.8-1 ml/L; the reaction time was 30 min.
Has the advantages that: by setting the ultraviolet light-hydrogen peroxide system, the ultraviolet light-hydrogen peroxide system can fully react with organic matters in the primary filtrate, and the ultraviolet light-hydrogen peroxide system is better matched with the organic matters after reaction to be adsorbed by an adsorbent.
Further, in the third step, an ultraviolet light-ozone system adopts 254nm, 25W ultraviolet lamp tubes, 81 lamp tubes are arranged in filtrate every cubic meter, and the lamp tubes are arranged according to a 9X9 mode; ozone is introduced into the filtrate according to the proportion of 10g/h/L, and the reaction time is 60 min.
Has the advantages that: through setting up ultraviolet ray-ozone system, can fully react with the organic matter in the primary filtrate, follow-up organic matter after will reacting through the adsorbent of better cooperation adsorbs.
Further, in the fourth step, the used adsorbent is one or more of activated carbon, macroporous adsorption resin and chelating resin.
Has the advantages that: the adsorbent is set, so that the adsorption effect can be improved, and the purity of the extracted sodium chloride is improved.
Furthermore, in the fourth step, the adsorbent used is coconut shell-shaped activated carbon special for ultrapure water.
Has the advantages that: the coconut shell-shaped activated carbon special for ultrapure water has good adsorption effect, and can ensure that the purity of the extracted sodium chloride is high.
In summary, the extraction of sodium chloride by using industrial waste salt is to remove impurities in sodium chloride, and the main components in the industrial waste salt are sodium chloride, organic matters and inorganic ions. Generally, the purification of industrial waste salt is mainly a high temperature method and an oxidation method, wherein the high temperature method volatilizes organic matters in the waste salt in a high temperature burning mode to complete the extraction of sodium chloride, and only part of organic matter impurities in the waste salt can be volatilized in the high temperature burning mode, so that more organic matter impurities remain in the extracted sodium chloride, and the application of the extracted sodium chloride is limited. The oxidation method is to introduce an oxidant to react with organic matters in the waste salt so as to complete the extraction of sodium chloride, usually acid and alkali are added into an aqueous solution to adjust the pH value, and iron ions are added to catalyze hydrogen peroxide, so that impurities except sodium chloride are introduced; when persulfate is adopted for oxidation, sulfate radicals can be introduced; the hydrogen peroxide is independently used for oxidation, other ions are not introduced, but the oxidation speed is slow. Therefore, the use of oxidation introduces new impurities, which lead to other impurities than the organic matter remaining in the extracted sodium chloride, reducing the purity of the extracted sodium chloride; or the oxidation speed is slow, which cannot be adapted to industrial application.
The invention completes the extraction of sodium chloride by adopting a 'subtraction' mode for industrial waste salt, and firstly, volatilizes part of organic matters by utilizing an incineration mode; then water quenching, dissolving and filtering are carried out, so that impurities which cannot be accommodated can be filtered; then oxidizing, which can oxidize the residual organic matter, and the used ultraviolet light-hydrogen peroxide system or ultraviolet light-ozone system can not introduce new impurities; and finally, the organic matters after reaction are adsorbed by matching with an adsorbent, so that impurities are further removed. The fine impurities generated in the oxidation process can be removed together in a mode of oxidation and adsorption. And the condition of color reversion can occur after oxidation to influence the quality of the recovered sodium chloride, and the adsorption step also has the function of decoloring, so that the appearance of the recovered sodium chloride can be kept better. And the process requirement in the whole step is simple, and organic matters (TOC or COD) can be deeply and thoroughly removed, so that the purity of the extracted sodium chloride is high. The invention has simple process, simple and convenient operation, simple equipment, thorough impurity removal and low recovery cost, is convenient for industrial popularization and application, completes resource recycling, plays a role in energy conservation and is beneficial to environmental protection.
Drawings
FIG. 1 is a flow chart of the process for recovering technical grade sodium chloride from industrial waste salt according to the present invention.
Detailed Description
Example 1:
the method for recovering the industrial-grade sodium chloride by using the industrial waste salt comprises the following steps:
step one, burning
And putting the waste salt into a microwave muffle furnace, and burning the waste salt at the temperature of 650-950 ℃ for 30-120 min to obtain the waste A. In this example, the incineration temperature was 650 ℃ and the incineration time was 120min, and the TOC in the waste A was reduced from 42000mg/L to 87.7mg/L after incineration.
Step two, water quenching and dissolving
And cooling the waste A to 100 ℃, putting the waste A into deionized water for water quenching and dissolving, and proportioning the waste A and the deionized water according to a ratio of 1: 10-30. And then, carrying out centrifugal filtration on the solution by using a centrifugal separator to obtain primary filtrate. The ratio of waste material A to deionized water in this example was 1: 10.
Step three, advanced oxidation
Selecting 254nm and 25W ultraviolet lamps, proportioning 81 ultraviolet lamps per cubic meter of filtrate, and arranging the lamps according to a 9X9 array. Adding 30% hydrogen peroxide according to the proportion of 1ml/L, and reacting for 30min to obtain secondary filtrate. The TOC content in the secondary filtrate was 25.7 mg/L.
Step four, deep adsorption
And (3) passing the secondary filtrate through an adsorption column prepared from AL-8 macroporous adsorption resin, and adsorbing impurities in the secondary filtrate by using the adsorption column to obtain a sodium chloride solution. The sodium chloride solution obtained was tested and the TOC was reduced to 12.8 mg/L.
Example 2:
example 2 differs from example 1 in that in the first step of this example, the waste salt is incinerated at 800 ℃ for 75min to obtain waste material A, and the TOC content in the waste material A is reduced from 37800mg/L to 54.8 mg/L; in the second step, the waste A is cooled to 150 ℃ and then put into deionized water for water quenching and dissolution, wherein the ratio of the waste A to the deionized water is 1: 7; separating and filtering the obtained waste salt solution by using a plate type filtering device; in the third step, the TOC content is reduced to 17.8 mg/L; in the fourth step, sub-Packaged Activated Carbon (PAC) is adopted for adsorption, and the TOC content in the obtained sodium chloride solution is 11.3 mg/L.
Example 3:
example 3 differs from example 1 in that in the first step of this example, the waste salt is incinerated at 900 ℃ for 60min to obtain waste material A, and the TOC content in the waste material A is reduced from 41300mg/L to 45.6 mg/L; in the second step, directly putting the waste material A formed after incineration into deionized water, wherein the weight ratio of the waste material A to the deionized water is 1:7, and separating and filtering the obtained waste salt solution by using a plate type filtering device; in the third step, the TOC content is reduced to 10.2 mg/L; in the fourth step, the adopted ultrapure water special coconut shell-shaped activated carbon (GAC) is adopted for adsorption, and the ultrapure water special coconut shell-shaped activated carbon meets the requirements of iodine adsorption value of 1000-1200mg/g and methylene blue of 11-13 ml; the TOC content of the sodium chloride solution obtained was 6.8 mg/L.
Example 4:
example 4 differs from example 1 in that in the first step of this example, the waste salt is incinerated at 900 ℃ for 60min to obtain waste material A, and the TOC content in the waste material A is reduced from 33595mg/L to 52.6 mg/L; in the second step, directly putting the waste A formed after incineration into deionized water, wherein the weight ratio of the waste A to the deionized water is 1:4, and separating and filtering the obtained waste salt solution by using a vacuum filtering device; in the third step, 254nm and 25W ultraviolet lamps are selected, the filtrate is proportioned according to 81 ultraviolet lamps per cubic meter, and the lamps are arranged according to an array of 9X 9; then introducing ozone into the primary filtrate according to the proportion of 10g/h/L, and reacting for 60 min; the TOC content is reduced to 19.4 mg/L; in the fourth step, the adopted ultrapure water special coconut shell-shaped activated carbon (GAC) is adopted for adsorption, and the ultrapure water special coconut shell-shaped activated carbon meets the requirements of iodine adsorption value of 1000-1200mg/g and methylene blue of 11-13 ml; the TOC content of the sodium chloride solution obtained was 7.7 mg/L.
In this embodiment, when letting in ozone, let in ozone to a filtrate according to micro-nano aeration mode, this kind of mode can make ozone improve more than 5 times in a filtrate solubility, and undissolved ozone can exist in the water with the form (diameter is less than 30 microns) suspension or absorption of micro-nano bubble, the rising speed of this kind of micro-nano bubble in aqueous only has about 2% of ordinary aeration bubble (by diameter 1 mm) rising speed, the contact time and the area of contact of ozone with organic matter in aqueous and catalyst have been improved, the dwell time of bubble in a filtrate has been prolonged, make ozone have abundant time and chance, take place the oxidation reaction of combining in step with the organic matter in a filtrate on the surface of catalyst. Meanwhile, micro-nano bubbles can generate cavitation when the product is about to be extinguished, and bubble boundaries have extremely high pressure (more than 50 MPa) and instantaneous high temperature (more than 5200K), so that organic matters meeting the bubbles are subjected to chemical cracking and free radical degradation. Can make the oxidation effect to a filtrating good, and then can get rid of the organic matter fast and the efficient, can cooperate follow-up step simultaneously, accomplish the degree of depth and get rid of the organic matter, and then can make the sodium chloride purity of retrieving high, can satisfy the industrial application.
The TOC content of examples 1-4 was tested in terms of a 20% salt solution.
In conclusion, the method for recovering industrial-grade sodium chloride by using industrial waste salt provided by the invention can effectively remove organic impurities in the industrial waste salt, and does not introduce new impurities, so that the purity of the extracted sodium chloride is high, and the method is suitable for industrial application. And the method is simple to operate, has low requirements on the process, and can be widely applied to industrial production.
It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention, and these changes and modifications should not be construed as affecting the performance of the invention and its practical application.
Claims (7)
1. The method for recovering the industrial-grade sodium chloride by using the industrial waste salt is characterized by comprising the following steps of:
step one, burning
Incinerating the waste salt at 650-950 ℃ for 30-120 min to obtain waste A;
step two, water quenching and dissolving
Putting the waste A into deionized water for water quenching and dissolving to obtain a waste salt solution, filtering the waste salt solution, and removing insoluble substances to obtain primary filtrate;
step three, advanced oxidation
Performing photocatalytic oxidation by adopting an ultraviolet light-hydrogen peroxide system or an ultraviolet light-ozone synergistic system to react organic matters in the primary filtrate to obtain secondary filtrate;
step four, deep adsorption
And (4) adding an adsorbent into the secondary filtrate to remove impurities in the secondary filtrate to obtain a sodium chloride solution.
2. The method for recovering industrial-grade sodium chloride from industrial waste salt according to claim 1, characterized in that: in the first step, a fixed bed incinerator, a rotary kiln incinerator, a heat accumulating type incinerator, a plasma high-temperature furnace, a muffle furnace or a microwave oven is used during incineration.
3. The method for recovering industrial grade sodium chloride using industrial waste salt according to claim 2, characterized in that: in the second step, the ratio of the waste material A to the deionized water is 1: 3-10.
4. The method for recovering industrial grade sodium chloride using industrial waste salt according to claim 3, characterized in that: in the third step, an ultraviolet light-hydrogen peroxide system adopts 254nm, 25W ultraviolet lamps, 81 lamps are arranged in each cubic meter of filtrate, and the lamps are arranged according to a mode of 9X 9; the concentration of hydrogen peroxide is 30%, and the primary filtrate is proportioned according to 0.8-1 ml/L; the reaction time was 30 min.
5. The method for recovering industrial grade sodium chloride using industrial waste salt according to claim 3, characterized in that: in the third step, an ultraviolet light-ozone system adopts 254nm, 25W ultraviolet lamp tubes, 81 lamp tubes are arranged in filtrate every cubic meter, and the lamp tubes are arranged according to a mode of 9X 9; ozone is introduced into the filtrate according to the proportion of 10g/h/L, and the reaction time is 60 min.
6. The method for recovering sodium chloride of industrial grade using industrial waste salts according to claim 4 or 5, characterized in that: in the fourth step, the used adsorbent is one or more of activated carbon, macroporous adsorption resin and chelating resin.
7. The method for recovering industrial-grade sodium chloride from industrial waste salt according to claim 6, characterized in that: in the fourth step, the adsorbent used is coconut shell-shaped activated carbon special for ultrapure water.
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| CN202110545806.9A CN113233477A (en) | 2021-05-19 | 2021-05-19 | Method for recovering industrial-grade sodium chloride by using industrial waste salt |
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| CN202110545806.9A CN113233477A (en) | 2021-05-19 | 2021-05-19 | Method for recovering industrial-grade sodium chloride by using industrial waste salt |
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| CN114835309A (en) * | 2021-12-22 | 2022-08-02 | 朱臻 | Waste salt recovery equipment for chlor-alkali chemical production and recovery method thereof |
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Application publication date: 20210810 |