CN111847480A - Purification treatment and resource recycling method for industrial sodium chloride waste salt - Google Patents
Purification treatment and resource recycling method for industrial sodium chloride waste salt Download PDFInfo
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 title claims abstract description 153
- 150000003839 salts Chemical class 0.000 title claims abstract description 104
- 239000002699 waste material Substances 0.000 title claims abstract description 76
- 239000011780 sodium chloride Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000004064 recycling Methods 0.000 title claims abstract description 20
- 238000000746 purification Methods 0.000 title claims abstract description 14
- 238000005336 cracking Methods 0.000 claims abstract description 34
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 26
- 238000000197 pyrolysis Methods 0.000 claims abstract description 21
- 239000012535 impurity Substances 0.000 claims abstract description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000001301 oxygen Substances 0.000 claims abstract description 16
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 16
- 230000003197 catalytic effect Effects 0.000 claims abstract description 13
- 230000003647 oxidation Effects 0.000 claims abstract description 12
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 12
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 12
- 239000003054 catalyst Substances 0.000 claims abstract description 11
- 239000012298 atmosphere Substances 0.000 claims abstract description 7
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 12
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical compound OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 claims description 10
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 9
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 7
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 5
- 238000011068 loading method Methods 0.000 claims description 5
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000002912 waste gas Substances 0.000 claims description 4
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 3
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 239000012047 saturated solution Substances 0.000 claims description 2
- 239000005416 organic matter Substances 0.000 abstract description 12
- 238000005265 energy consumption Methods 0.000 abstract description 9
- 238000002309 gasification Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 230000008016 vaporization Effects 0.000 abstract description 2
- 238000009834 vaporization Methods 0.000 abstract 1
- 235000017550 sodium carbonate Nutrition 0.000 description 10
- 238000004458 analytical method Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 239000002893 slag Substances 0.000 description 5
- 239000012855 volatile organic compound Substances 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000002440 industrial waste Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 239000002894 chemical waste Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 239000010805 inorganic waste Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 239000010914 pesticide waste Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011268 retreatment Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a purification treatment and resource recycling method of industrial sodium chloride waste salt, which comprises the steps of carrying out microwave pyrolysis treatment on organic matters in the sodium chloride waste salt in an air atmosphere to obtain sodium chloride for producing sodium carbonate, and enabling air containing organic impurities generated by microwave pyrolysis to enter an oxygen-critical cracking device to be subjected to catalytic oxidation cracking under the action of a catalyst. The invention utilizes the property that the organic matter can absorb the microwave but the sodium chloride salt can not absorb the microwave, the microwave is directly acted on the sodium chloride waste salt containing the organic matter in the air atmosphere, the organic matter in the waste salt generates heat after absorbing the microwave so as to raise the temperature, the organic matter in the waste salt generates vaporization in a short time, part of the organic matter is oxidized while volatilizing, and thus, the organic matter is separated from the sodium chloride, and finally, the sodium chloride is purified. The gasification material is subjected to the temporary oxygen cracking treatment, so that the treatment energy consumption and cost are greatly reduced. The invention has the characteristics of short processing time, high efficiency and low energy consumption.
Description
Technical Field
The invention belongs to the field of environmental protection and chemical waste comprehensive treatment and utilization, relates to a method for purifying and recycling industrial sodium chloride waste salt, and particularly relates to a method for purifying and recycling industrial sodium chloride waste salt containing organic pollutants.
Background
A large amount of byproduct salt slag is generated in the production process of a plurality of chemical products, especially pesticides. According to estimation, the annual production of only the pesticide waste salt in China reaches more than 500 million tons. The waste salt has the characteristics of various types, complex components, high content of toxic and harmful substances, high treatment cost, great environmental hazard and the like. The main component of the waste salt is sodium chloride, and in addition, the waste salt also contains a small amount of water and organic matters which have high toxicity and can form a great threat to the ecological environment and the human health if the waste salt is not properly treated, so that the chemical waste salt belongs to dangerous solid waste. Meanwhile, the waste salt is easy to agglomerate due to moisture, and is not beneficial to be used as a raw material of other corresponding products. On the other hand, sodium chloride is an important strategic resource as an important chemical raw material, and is used as a raw material in many chemical production. Therefore, the industrial waste salt is recycled by using a proper process and equipment as the industrial raw material salt, so that the environmental pollution can be eliminated, the precious salt resources can be fully utilized, the by-products are recycled, and the circular economy is realized.
Due to the overall level of resource utilization and harmless disposal of waste saltLower, the normalization degree is uneven. In the face of increasingly strict environmental protection policies, the treatment and disposal of waste salt become problems to be solved urgently. According to the return after the waste salt disposal, the waste salt disposal means can be classified into sea drainage, landfill and resource utilization. In foreign countries, the salt is directly dumped into the ocean or directly buried after harmless treatment is mostly adopted for treating the waste salt, but the treatment mode has great limitation, high cost and higher requirement on plant sites, and the waste salt is required not to contain toxic inorganic substances. In addition, the method also causes serious waste of sodium chloride resources in the inorganic waste salt. Therefore, resource utilization is the main direction of waste salt treatment. At present, the method for resource utilization of waste salt comprises the following steps: the salt washing method washes salt slag with water or organic solvent to eliminate impurity from salt slag as much as possible, and the treated salt is used in alkali industry. However, the salt washing method has large dosage of salt washing water, the washing water is easy to generate secondary pollution, the retreatment cost is high, and organic impurities in the waste salt are difficult to remove. ② high-temperature treatment method: the salt slag is treated at high temperature, so that organic impurities contained in the salt slag are decomposed into gas at high temperature, the aim of removing the organic impurities is fulfilled, and pure sodium chloride is obtained. For example, CN207222538U discloses that waste salt powder is directly sprayed into an incinerator, where organic matters and decomposable components are decomposed at high temperature, and the organic matters in the waste salt can be well treated. However, sodium chloride melts at 800 ℃ and causes corrosion of equipment and blockage of pipelines, which causes great maintenance pressure on the equipment and has high energy consumption. Furthermore, once Cl in the gas phase at high temperature -The concentration of (b) increases, corrosion of the apparatus wall of the post-system is likely to occur. Thirdly, microwave treatment, namely heating and decomposing organic matters and decomposable inorganic salts in the waste salt by a microwave device to obtain usable salts. For example, CN104344407A proposes to treat waste salt by microwave, and the technical key is that the microwave treatment is carried out for more than 100min at 450-500 ℃ in a nitrogen atmosphere, so that organic matters in the waste salt are decomposed and volatilized, and the harmless treatment of the waste salt is realized. But the organic steam generated by microwave analysis is complex to process, the temperature needs to be over 1100 ℃, and the energy consumption and the cost are high. A melting method, CN205659976U discloses a process for treating waste salt by adopting melting, impurity removal and condensationThe method removes organic matters to obtain high-quality salt, but the energy consumption is too high, and the requirement on equipment is higher. The CN107803395A discloses a waste salt treatment process of the carbonization method, but has the disadvantages of high process energy consumption and high equipment requirement.
In summary, the existing industrial waste salt disposal methods still have many disadvantages. The invention aims to solve the problems and provides a technical method for harmlessly treating industrial waste salt and reducing treatment energy consumption, and the technical method is used for recycling the waste salt.
Disclosure of Invention
The invention aims to overcome the defects of the existing waste salt treatment technology and provide a purification treatment and resource recycling method for industrial sodium chloride waste salt, the method combines a microwave cracking treatment method and an adjacent oxygen cracking technology, is suitable for various types of sodium chloride waste salt containing organic impurities, can realize the harmlessness of the waste salt, can send the harmlessness sodium chloride into a soda ash process to carry out resource recycling, and can ensure that the gas containing organic waste gas generated by microwave cracking does not generate secondary pollution in the waste salt treatment process by adopting the adjacent oxygen cracking purification technology.
The purpose of the invention is realized by the following technical scheme:
a purification treatment and resource recycling method for industrial sodium chloride waste salt comprises the following steps: under the air atmosphere, carrying out microwave pyrolysis treatment on organic matters in the sodium chloride waste salt, wherein the obtained sodium chloride is used for producing sodium carbonate, and air containing organic impurities generated by microwave pyrolysis enters an oxygen cracking device and is subjected to catalytic oxidation cracking treatment under the action of a catalyst to realize purification.
The invention relates to a purification treatment and resource recycling method of industrial sodium chloride waste salt, which comprises the following steps:
Crushing sodium chloride waste salt, and performing microwave pyrolysis treatment in an air atmosphere, wherein the microwave pyrolysis temperature is the self-heating temperature generated after the absorption of organic matters in the waste salt;
preparing saturated solution from sodium chloride subjected to microwave pyrolysis, filtering to remove mechanical impurities such as coke and the like, and sending the solution into a soda production process;
and (3) introducing the air containing the organic impurities generated by microwave pyrolysis into an oxygen-adjacent cracking device, and carrying out catalytic oxidation cracking treatment under the action of a catalyst.
The content of sodium chloride in the sodium chloride waste salt is 90% -95%, and the TOC of the waste salt is 10000-30000 mg/kg.
The organic impurities in the sodium chloride waste salt are selected from at least one of benzene, toluene, phenol, catechol, ethylene glycol monomethyl ether, methyl acetate, tert-butanol and n-butanol.
The microwave pyrolysis treatment comprises the following steps: the air inlet amount is 5-10 m3/kgSalt (salt)5-10 kg of microwave processing capacitySalt (salt)And h, kW, the temperature is 400-700 ℃, and the time is 20-40 min. The TOC in the sodium chloride subjected to microwave pyrolysis treatment is 0-6 mg/kg.
The temporary oxygen cracking device can adopt a fixed bed reactor.
The catalyst takes alumina with large specific surface area and relatively strong mechanical strength and high temperature resistance as a carrier, takes CuO as an active component, and has CuO loading capacity of 10-15%. In order to reduce the heat load of the device in the catalytic oxidative cracking process, the catalyst loading is controlled to be 60 percent of the volume of the fixed bed reactor.
The airspeed of the air containing the organic impurities is 10-20 h-1. The temperature of the catalytic oxidation cracking treatment is 250-450 ℃. After catalytic oxidation cracking treatment, the TOC value in water at the outlet of the oxygen cracking device is 0-20 mg/L, and the VOC in discharged waste gas is 0-10 mg/m3。
The invention has the beneficial effects that:
the invention utilizes the property that the organic matter can absorb the microwave but the sodium chloride salt can not absorb the microwave, the microwave is directly acted on the waste salt containing the organic matter in the air atmosphere, the organic matter in the waste salt generates heat after absorbing the microwave, thereby raising the temperature, vaporizing the organic matter in a short time, oxidizing part of the organic matter while volatilizing, separating the organic matter from the sodium chloride, and finally purifying the sodium chloride. The gasification material is subjected to the temporary oxygen cracking treatment, so that the treatment energy consumption and cost are greatly reduced. The invention has the characteristics of short processing time, high efficiency and low energy consumption.
Drawings
FIG. 1 is a process flow chart of the purification treatment and resource recycling method of industrial sodium chloride waste salt.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
In the embodiment, the temporary oxygen cracking device is a fixed bed reactor, and the filling amount of the catalyst is 60 percent of the volume of the fixed bed reactor; the catalyst takes alumina as a carrier and CuO as an active component, and the CuO loading capacity is 10%.
Example 1
The industrial sodium chloride waste salt to be treated consists of: 95% of sodium chloride, 1% of phenol, 1% of catechol, 0.5% of benzene and 18820mg/kg of total TOC of waste salt.
As shown in FIG. 1, the industrial sodium chloride waste salt is pulverized into particles and then fed into a microwave analyzer at a flow rate of 200kg/h, and the flow rate is 1000m3Introducing air at a microwave power of 30kW and a temperature of 500 deg.C for 30min, i.e. with an air introduction amount of 5m3/kgSalt (salt)The microwave treatment capacity was 6.67 kg/(h. kW).
The concentration of organic matters in the air discharged by the microwave analysis device is about 5000mg/m3At a volume space velocity of 20h-1Introducing into an oxygen cracking device, performing catalytic oxidation cracking treatment at 400 deg.C to obtain TOC of 3.21mg/L in outlet water of the oxygen cracking device and VOC of 3mg/m in discharged waste gas3。
The TOC in the sodium chloride after microwave pyrolysis treatment is 2.76mg/kg, and the recovery rate of the sodium chloride is 99.5%. Preparing sodium chloride into a sodium chloride saturated aqueous solution, filtering and producing sodium carbonate to obtain 143kg of sodium carbonate with the purity of 98%.
Example 2
The industrial sodium chloride waste salt to be treated consists of: the mass fraction of sodium chloride is 90%, the mass fraction of ethylene glycol monomethyl ether is 2%, the mass fraction of catechol is 1%, the mass fraction of benzene is 0.5%, and the total TOC of waste salt is 20647 mg/kg.
The industrial sodium chloride waste salt is crushed into particles according to the proportion of 150kgSalt (salt)The flow rate of/h is sent into a microwave analysis device and is 1050m according to the flow rate3Introducing air at a microwave power of 30kW and a temperature of 500 deg.C for 40min, i.e. with an air introduction amount of 7m3/kgSalt (salt)The microwave treatment capacity was 5 kg/(h.kW).
The concentration of organic matters in the air discharged by the microwave analysis device is about 5000mg/m3At a volume space velocity of 20h-1Introducing into an oxygen cracking device, performing catalytic oxidation cracking treatment at 450 deg.C to obtain TOC of 4.63mg/L and VOC of 5mg/m in discharged waste gas3。
The TOC in the sodium chloride waste after microwave pyrolysis treatment is 2.68mg/kg, and the recovery rate of sodium chloride is 99.6%. Preparing sodium chloride into saturated aqueous solution of sodium chloride, filtering, and producing soda ash to obtain 135kg of soda ash with the purity of 98%.
Example 3
The industrial sodium chloride waste salt to be treated consists of: the mass fraction of sodium chloride is 92%, the mass fraction of methyl acetate is 1%, toluene is 1%, the mass fraction of tert-butyl alcohol is 1%, the mass fraction of n-butyl alcohol is 1%, and the total TOC of waste salt is 26968 mg/kg.
The industrial sodium chloride waste salt is crushed into particles according to the proportion of 150kgSalt (salt)The flow rate of/h is sent into a microwave analysis device according to the flow rate of 1200m3Introducing air at a microwave power of 30kW and a temperature of 500 deg.C for 40min, i.e. the air introduction amount is 8m3/kgSalt (salt)The microwave treatment capacity was 5 kg/(h.kW).
The concentration of organic matters in the air discharged by the microwave analysis device is about 5000mg/m3At a volume space velocity of 20h-1Introducing into an oxygen cracking device, performing catalytic oxidation cracking treatment at 350 deg.C to obtain TOC of 7.34mg/L and tail gas VOCs of 6mg/m3。
The TOC in the sodium chloride after microwave pyrolysis treatment is 4.17mg/kg, and the recovery rate of the sodium chloride is 99.2%. Preparing sodium chloride into a sodium chloride saturated aqueous solution, filtering and producing sodium carbonate to finally obtain 138kg of sodium carbonate with the purity of 98%.
Example 4
The industrial sodium chloride waste salt to be treated consists of: the mass fraction of sodium chloride is 92%, the mass fraction of ethylene glycol monomethyl ether is 2%, the mass fraction of catechol is 0.5%, and the total TOC of waste salt is 12758 mg/kg.
Crushing industrial sodium chloride waste salt into particles according to the weight of 300kgSalt (salt)The flow rate of/h is sent into a microwave analysis device according to the flow rate of 1875m3Introducing air at a microwave power of 40kW and a temperature of 600 deg.C for 20min, i.e. 6.25m 3/kgSalt (salt)The microwave treatment capacity was 7.5 kg/(h. kW).
The concentration of organic matters in the air discharged by the microwave analysis device is about 4000mg/m3At a volume space velocity of 20h-1Introducing into an oxygen cracking device, performing catalytic oxidation cracking treatment at 300 deg.C to obtain TOC of 2.62mg/L and tail gas VOCs of 2mg/m3。
The TOC in the sodium chloride after microwave pyrolysis treatment is 1.87mg/kg, and the recovery rate of the sodium chloride is 99.8%. Preparing sodium chloride into a sodium chloride saturated aqueous solution, filtering and producing sodium carbonate to finally obtain 137kg of sodium carbonate with the purity of 98%.
Table 1: data from example 1 to example 4
Claims (10)
1. A method for purifying and recycling industrial sodium chloride waste salt is characterized in that organic matters in the sodium chloride waste salt are subjected to microwave pyrolysis treatment in the air atmosphere, the obtained sodium chloride is used for producing sodium carbonate, air containing organic impurities generated by microwave pyrolysis enters an oxygen cracking device, and catalytic oxidation cracking treatment is carried out under the action of a catalyst.
2. The method for purification treatment and resource recycling of industrial sodium chloride waste salt according to claim 1, characterized by comprising the following steps:
crushing sodium chloride waste salt, and performing microwave pyrolysis treatment in an air atmosphere;
Preparing saturated solution from sodium chloride subjected to microwave pyrolysis, filtering to remove impurities, and sending into a soda production process;
and (3) introducing the air containing the organic impurities generated by microwave pyrolysis into an oxygen-adjacent cracking device, and carrying out catalytic oxidation cracking treatment under the action of a catalyst.
3. The method for purifying and recycling industrial sodium chloride waste salt according to claim 1 or 2, wherein the sodium chloride content in the sodium chloride waste salt is 90-95%, and the TOC of the waste salt is 10000-30000 mg/kg.
4. The method according to claim 1 or 2, wherein the organic impurities in the waste sodium chloride salt are selected from at least one of benzene, toluene, phenol, catechol, ethylene glycol monomethyl ether, methyl acetate, tert-butanol, and n-butanol.
5. The method for purification treatment and resource recycling of industrial sodium chloride waste salt according to claim 1 or 2, characterized in that the microwave pyrolysis treatment is: the air inlet amount is 5-10 m3/kgSalt (salt)5-10 kg of microwave processing capacitySalt (salt)And h, kW, the temperature is 400-700 ℃, and the time is 20-40 min.
6. The method for purification treatment and resource recycling of industrial sodium chloride waste salt according to claim 1 or 2, wherein the TOC in the sodium chloride after microwave pyrolysis treatment is 0-6 mg/kg.
7. The method for purifying and recycling industrial sodium chloride waste salt according to claim 1 or 2, wherein the catalyst uses alumina as a carrier, CuO as an active component, and the CuO loading is 10-15%.
8. The method for purification treatment and resource recycling of industrial sodium chloride waste salt according to claim 1 or 2, characterized in that the temporary oxygen cracking device is a fixed bed reactor; the catalyst loading was 60% of the fixed bed reactor volume.
9. The method for purifying and recycling industrial sodium chloride waste salt as claimed in claim 1 or 2, wherein the air speed of the air containing organic impurities is 10-20 h-1(ii) a The temperature of the catalytic oxidation cracking treatment is 250-450 ℃.
10. The method for purification treatment and resource recycling of industrial sodium chloride waste salt according to claim 1 or 2, characterized in that the TOC value in the water at the outlet of the oxygen cracking device is 0-20 mg/L, and the VOC in the discharged waste gas is 0-10 mg/m3。
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113149035A (en) * | 2020-12-29 | 2021-07-23 | 中国科学院生态环境研究中心 | Method for treating waste sodium chloride salt |
| CN113877937A (en) * | 2021-10-18 | 2022-01-04 | 亚德（上海）环保系统有限公司 | Method and system for treating waste salt through microwave thermal desorption and oxidation of rotary kiln |
| CN113894136A (en) * | 2020-11-19 | 2022-01-07 | 上海深健环保科技有限公司 | Method for removing TOC (total organic carbon) in industrial solid waste salt |
| CN115043416A (en) * | 2022-07-19 | 2022-09-13 | 西安交通大学 | Method and system for removing organic pollutants in sodium-based polluted salt |
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| CN113877937B (en) * | 2021-10-18 | 2023-12-26 | 亚德（上海）环保系统有限公司 | Method and system for thermal desorption and oxidation treatment of waste salt through rotary kiln microwaves |
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| CN115043416B (en) * | 2022-07-19 | 2023-07-11 | 西安交通大学 | Method and system for removing organic pollutants in sodium-based polluted salt |
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