CN111468516B - Medium-temperature pyrolysis resource utilization treatment process for medical waste salt - Google Patents
Medium-temperature pyrolysis resource utilization treatment process for medical waste salt Download PDFInfo
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- 150000003839 salts Chemical class 0.000 title claims abstract description 134
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000002906 medical waste Substances 0.000 title claims abstract description 39
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 19
- 239000002699 waste material Substances 0.000 claims abstract description 88
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 29
- 238000009835 boiling Methods 0.000 claims abstract description 24
- 229910017053 inorganic salt Inorganic materials 0.000 claims abstract description 19
- 238000001035 drying Methods 0.000 claims description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 17
- 230000035484 reaction time Effects 0.000 claims description 16
- 239000002912 waste gas Substances 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- QGLWBTPVKHMVHM-KTKRTIGZSA-N (z)-octadec-9-en-1-amine Chemical compound CCCCCCCC\C=C/CCCCCCCCN QGLWBTPVKHMVHM-KTKRTIGZSA-N 0.000 claims description 9
- 239000003513 alkali Substances 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 8
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 239000012528 membrane Substances 0.000 claims description 8
- 239000003921 oil Substances 0.000 claims description 8
- 239000003960 organic solvent Substances 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 238000007670 refining Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- RCNRJBWHLARWRP-UHFFFAOYSA-N ethenyl-[ethenyl(dimethyl)silyl]oxy-dimethylsilane;platinum Chemical compound [Pt].C=C[Si](C)(C)O[Si](C)(C)C=C RCNRJBWHLARWRP-UHFFFAOYSA-N 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 7
- 239000002981 blocking agent Substances 0.000 claims description 4
- 238000006459 hydrosilylation reaction Methods 0.000 claims description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract description 20
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 239000002957 persistent organic pollutant Substances 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 4
- 239000005416 organic matter Substances 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 238000006864 oxidative decomposition reaction Methods 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 description 9
- 238000002474 experimental method Methods 0.000 description 9
- 239000011780 sodium chloride Substances 0.000 description 9
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000012266 salt solution Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 150000003141 primary amines Chemical class 0.000 description 1
- 125000001453 quaternary ammonium group Chemical class 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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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
-
- 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
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the field of environmental protection, in particular to a medium-temperature pyrolysis resource utilization treatment process for medical waste salt; the invention provides a process for pyrolyzing medical waste salt at medium temperature and recycling the medical waste salt, which mainly utilizes the boiling bed reaction principle to fully oxidize and decompose organic pollutants at low temperature by removing volatile substances from the waste salt, thereby achieving the purposes of harmless treatment of the waste salt and recycling the waste salt; the addition of the inorganic salt anti-caking agent can effectively prevent the waste salt from caking in the fluidized bed reactor and ensure the full oxidative decomposition of organic pollutants, and is the key of the process; the waste salt obtained by the method for treating the medical waste salt has extremely low organic residue, no caking phenomenon, sufficient organic matter oxidation and obvious energy saving effect, and the medical waste salt is effectively treated, so that the method not only can protect the environment, but also can recycle the main component sodium chloride salt, make up the market gap and have higher economic value.
Description
Technical Field
The invention relates to the field of environmental protection, in particular to a medium-temperature pyrolysis resource utilization treatment process for medical waste salt.
Background
The main components of the medical waste salt are inorganic salt sodium chloride, a small amount of inorganic impurities such as nitrate, sulfate and the like, besides, the medical waste salt contains a large amount of harmful refractory organic matters, generates strong fishy smell, and is generally required to be sent to a landfill for treatment as dangerous waste. The materials are stockpiled or poured into the open air environment in the open air, and great threat is caused to the environment.
CN108164138A discloses a harmless treatment method of medical waste salt, which comprises the following steps: taking medical waste salt and quartz sand; adding an additive; fully and uniformly mixing, and setting the temperature; heating and preserving heat; cooling to room temperature to obtain the treated harmless product. The harmless product obtained by the method has higher hardness, can not be melted after being soaked in water, and can meet the actual requirements of producing floor tiles and other building material products. In addition, chlorine is generated at the same time, so that the chlorine can be recycled, and the process cost is reduced; and the organic matter which is difficult to degrade can be completely converted into harmless substances, and the harm of the medical waste salt to the environment is thoroughly solved.
CN105060314A relates to a waste salt treatment process, in particular to a waste salt treatment process for removing organic impurities in waste salt by melting the waste salt. The invention solves the problem that the waste salt cannot be sold due to various organic impurities, simultaneously solves the problem that the organic impurities are brought into hot air to form new pollutants again, provides an effective method for condensing molten salt, and finally obtains qualified recyclable finished salt. The invention changes waste into valuable, has low cost and protects the environment.
CN111003866A provides a waste salt concentration processing apparatus, relates to the waste salt concentration field, including evaporation mechanism, gas-liquid separation mechanism, precipitation mechanism and condensation mechanism, the top of evaporation mechanism pass through the third communicating pipe with gas-liquid separation mechanism's one side middle part intercommunication. In the invention, a novel and simple waste salt solution concentration treatment process is adopted, a single-effect evaporation technology is utilized, waste salts with different boiling points are separated out in a centralized manner, resource recycling is realized, the problem of coking waste salt discharge is solved in a simpler and more efficient manner, the condensate separated by waste salt solution concentration can be used for pre-desulfurization water supplement of coal gas produced by coking or other places, resource recycling is realized, all solutions in the system can be discharged into a settling tank when the device is stopped emergently, the device is ensured not to be discharged outside or scaled, no waste water is discharged in the process, a heat source of an evaporation device can select coke oven smoke, and the operating cost of steam heating can be saved.
The method and the prior art generally adopt a high-temperature method to recover and treat the medical waste salt, the method usually heats the waste salt to 800-.
Disclosure of Invention
In order to solve the problems, the invention provides a medium-temperature pyrolysis resource utilization treatment process for medical waste salt.
A middle-temperature pyrolysis resource utilization treatment process for medical waste salt comprises the following main schemes:
adding 1-10 parts of anti-caking agent into 1000-1500 parts of medical waste salt by mass, mixing and stirring for 10-60min in a mixing kettle, adding the waste salt into a dryer, controlling the temperature to be 80-130 ℃, drying for 10-120min, keeping the content of volatile components such as water, volatile organic solvent and the like in the waste salt to be 0.1-5%, and slowly adding the waste salt into a medium-temperature reactor by using a feeder at the feeding speed of 50-80 kg/min; the temperature in the reactor is 350-450 ℃, and the heating reaction time is 5-30 min; the temperature of the second section in the reactor is 450-650 ℃, and the heating reaction time is 10-40 min; the method is characterized in that the medium-temperature reactor is a boiling bed reactor, compressed air is introduced into the bottom of the reactor after waste salt is added into the reactor, the waste salt in the reactor is in a boiling state under the blowing of the compressed air, the pressure of the compressed air is 0.5-2MPa, and the air flow is 10-20L/min; the waste gas in the fluidized bed reactor can be directly discharged after being treated; discharging after the completion to obtain the treated waste salt.
The anticaking agent is an inorganic salt anticaking agent, and the preparation method comprises the following steps:
according to the mass parts, 20-30 parts of cis-9-octadecenylamine, 2-6 parts of cis-quaternary ammonium salt-15, 200-containing white oil, 10-15 parts of 1, 1-dimethyl silicon-based iron, 0.02-0.2 part of 1, 3-divinyl-1, 1,3, 3-tetramethyl disiloxane platinum are controlled at 80-120 ℃, stirred for 30-60min and cooled to 40-60 ℃ for discharging, and the inorganic salt anti-blocking agent can be obtained.
The reaction mechanism is as follows:
cis-9-octadecenylamine and cis-15 quaternary ammonium salt respectively perform hydrosilylation reaction with 1, 1-dimethyl silicon-based iron. The reaction equation is schematically shown below:
the dryer is crawler-type drying equipment or drying oven type drying equipment.
The feeder is a screw feeder or a vibration feeder.
The treated waste salt can be used as raw materials for refining industrial salt or ionic membrane chlor-alkali.
The waste gas in the fluidized bed reactor can be discharged after passing through a full combustion furnace at 800-1000 ℃.
The invention relates to a medical waste salt medium-temperature pyrolysis resource utilization treatment process, and provides a medium-temperature pyrolysis medical waste salt resource utilization process, wherein the waste salt subjected to volatile substance removal is fully oxidized and decomposed with organic pollutants at a lower temperature by mainly utilizing a fluidized bed reaction principle, so that the purposes of harmless treatment and resource utilization of the waste salt are achieved; the addition of the inorganic salt anti-caking agent can effectively prevent the waste salt from caking in the fluidized bed reactor and ensure the full oxidative decomposition of organic pollutants, and is the key of the process; the waste salt obtained by the method for treating the medical waste salt has extremely low organic residue, no caking phenomenon, sufficient organic matter oxidation and obvious energy saving effect, and the medical waste salt is effectively treated, so that the method not only can protect the environment, but also can recycle the main component sodium chloride salt, make up the market gap and have higher economic value.
Drawings
FIG. 1 is a Fourier infrared spectrum of the product inorganic salt anticaking agent prepared in example 1.
At 2929cm-1An antisymmetric telescopic absorption peak of the hydrocarbon exists nearby, and is 2839cm-1A symmetric telescopic absorption peak of hydrocarbon exists nearby and is 1462cm-1An asymmetric bending absorption peak of the hydrocarbon exists nearby, which indicates that the white oil participates in the reaction; at 3330cm-1A symmetric telescopic absorption peak of aliphatic primary amine nitrogen and hydrogen exists nearby, which indicates that cis-9-octadecenylamine participates in the reaction; at 2224cm-1A stretching absorption peak of silicon hydrogen exists nearby, which indicates that 1, 1-dimethyl silicon-based iron participates in the reaction; at 768cm-1The absorption peak of carbon and chlorine in the vicinity of the absorption peak is 1052cm-1A telescopic absorption peak of a tertiary amine carbon-nitrogen single bond exists nearby, which indicates that the cis-form quaternary ammonium salt-15 participates in the reaction; at 1641cm-1No obvious absorption peak of carbon-carbon double bonds exists nearby, which indicates that the double bonds are all involved in the reaction.
Detailed Description
The invention is further illustrated by the following specific examples:
the method for detecting the residual rate of the organic matters in the waste salt treated by the experiment comprises the following steps: 10kg of the powder is taken out of a crucible, the temperature of a muffle furnace is set at 700 ℃, the powder is burned for 3h, then the crucible is taken out by using crucible tongs and placed in a drier with anhydrous calcium chloride, the powder is weighed after the temperature of the crucible is reduced to room temperature, and the change of mass is recorded. The detection of the purity of the sodium chloride in the waste salt treated in the experiment is carried out according to the method in the universal test method of KGB/T13025.5-2012 salt manufacturing industry. The content of organic matters in the waste medical salt adopted in the experiment is 5.72%, and the content of sodium chloride is 85.424%.
Example 1
A middle-temperature pyrolysis resource utilization treatment process for medical waste salt comprises the following main schemes:
adding 1kg of anti-caking agent into 1000kg of medical waste salt, mixing and stirring in a mixing kettle for 10min, adding the waste salt into a dryer, controlling the temperature to be 80 ℃, drying for 120min, keeping the content of volatile components such as water, volatile organic solvents and the like in the waste salt to be 0.1%, and slowly adding the waste salt into a medium-temperature reactor by using a feeder at a feeding speed of 50 kg/min; the temperature in the reactor is 350 ℃, and the heating reaction time is 30 min; the temperature of the second section in the reactor is 450 ℃, and the heating reaction time is 40 min; the method is characterized in that the medium-temperature reactor is a boiling bed reactor, compressed air is introduced into the bottom of the reactor after waste salt is added into the reactor, the waste salt in the reactor is in a boiling state under the blowing of the compressed air, the pressure of the compressed air is 0.5MPa, and the air flow is 10L/min; the waste gas in the fluidized bed reactor can be directly discharged after being treated; discharging after the completion to obtain the treated waste salt.
The anticaking agent is an inorganic salt anticaking agent, and the preparation method comprises the following steps:
20kg of cis-9-octadecenylamine, 2kg of cis-quaternary ammonium salt-15, 200kg of white oil, 10kg of 1, 1-dimethyl silicon-based iron and 0.02kg of 1, 3-divinyl-1, 1,3, 3-tetramethyldisiloxane platinum are stirred for 30min at the temperature of 80 ℃ and cooled to 40 ℃ to be discharged, and the inorganic salt anti-caking agent can be obtained.
The dryer is crawler-type drying equipment.
The feeder is a screw feeder.
The treated waste salt can be used as raw materials for refining industrial salt or ionic membrane chlor-alkali.
The waste gas in the boiling bed reactor can be discharged after passing through a full combustion furnace at 800 ℃.
The residual rate of organic matters in the waste salt treated by the experiment is 0.37%, and the purity of sodium chloride is 98.371%.
Example 2
A middle-temperature pyrolysis resource utilization treatment process for medical waste salt comprises the following main schemes:
adding 5kg of anticaking agent into 1200kg of medical waste salt, mixing and stirring in a mixing kettle for 30min, adding the waste salt into a dryer, controlling the temperature at 110 ℃, drying for 80min, keeping the content of volatile components such as water, volatile organic solvent and the like in the waste salt at 2.5%, and slowly adding the waste salt into a medium-temperature reactor by using a feeder at a feeding speed of 60 kg/min; the temperature in the reactor is 400 ℃, and the heating reaction time is 20 min; the temperature of the second section in the reactor is 550 ℃, and the heating reaction time is 30 min; the method is characterized in that the medium-temperature reactor is a boiling bed reactor, compressed air is introduced into the bottom of the reactor after waste salt is added into the reactor, the waste salt in the reactor is in a boiling state under the blowing of the compressed air, the pressure of the compressed air is 1MPa, and the air flow is 15L/min; the waste gas in the fluidized bed reactor can be directly discharged after being treated; discharging after the completion to obtain the treated waste salt.
The anticaking agent is an inorganic salt anticaking agent, and the preparation method comprises the following steps:
25kg of cis-9-octadecenylamine, 4kg of cis-quaternary ammonium salt-15, 260kg of white oil, 12kg of 1, 1-dimethyl silicon-based iron and 0.09kg of 1, 3-divinyl-1, 1,3, 3-tetramethyldisiloxane platinum are stirred for 40min at the temperature of 92 ℃ and cooled to 50 ℃ to be discharged, and the inorganic salt anti-blocking agent can be obtained.
The dryer is drying equipment in a drying oven type.
The feeder is a vibration feeder.
The treated waste salt can be used as raw materials for refining industrial salt or ionic membrane chlor-alkali.
The waste gas in the boiling bed reactor is discharged after passing through a full combustion furnace at 900 ℃.
The residual rate of organic matters in the waste salt treated by the experiment is 0.21%, and the purity of sodium chloride is 99.472%.
Example 3
A middle-temperature pyrolysis resource utilization treatment process for medical waste salt comprises the following main schemes:
adding 10kg of anti-caking agent into 1500kg of medical waste salt, mixing and stirring in a mixing kettle for 60min, adding the waste salt into a dryer, controlling the temperature at 130 ℃, drying for 10min, keeping the content of volatile components such as water, volatile organic solvent and the like in the waste salt at 05%, and slowly adding the waste salt into a medium-temperature reactor by using a feeder at a feeding speed of 80 kg/min; the temperature in the reactor is 450 ℃, and the heating reaction time is 5 min; the temperature of the second section in the reactor is 650 ℃, and the heating reaction time is 10 min; the method is characterized in that the medium-temperature reactor is a boiling bed reactor, compressed air is introduced into the bottom of the reactor after waste salt is added into the reactor, the waste salt in the reactor is in a boiling state under the blowing of the compressed air, the pressure of the compressed air is 2MPa, and the air flow is 20L/min; the waste gas in the fluidized bed reactor can be directly discharged after being treated; discharging after the completion to obtain the treated waste salt.
The anticaking agent is an inorganic salt anticaking agent, and the preparation method comprises the following steps:
30kg of cis-9-octadecenylamine, 6kg of cis-quaternary ammonium salt-15, 300kg of white oil, 15kg of 1, 1-dimethyl silicon-based iron and 0.2kg of 1, 3-divinyl-1, 1,3, 3-tetramethyldisiloxane platinum are stirred for 60min at the temperature of 120 ℃ and cooled to 60 ℃ to be discharged, and the inorganic salt anti-caking agent can be obtained.
The dryer is drying equipment in a drying oven type.
The feeder is a vibration feeder.
The treated waste salt can be used as raw materials for refining industrial salt or ionic membrane chlor-alkali.
The waste gas in the boiling bed reactor can be discharged after passing through a full combustion furnace at 1000 ℃.
The residual rate of organic matters in the waste salt treated by the experiment is 0.14%, and the purity of sodium chloride is 99.67%.
Comparative example 1
A middle-temperature pyrolysis resource utilization treatment process for medical waste salt comprises the following main schemes:
mixing and stirring 1000kg of medical waste salt in a mixing kettle for 10min, adding the waste salt into a dryer, controlling the temperature to be 80 ℃, drying for 120min, keeping the content of volatile components such as water, volatile organic solvents and the like in the waste salt to be 0.1%, and slowly adding the waste salt into a medium-temperature reactor by using a feeder at a feeding speed of 50 kg/min; the temperature in the reactor is 350 ℃, and the heating reaction time is 30 min; the temperature of the second section in the reactor is 450 ℃, and the heating reaction time is 40 min; the method is characterized in that the medium-temperature reactor is a boiling bed reactor, compressed air is introduced into the bottom of the reactor after waste salt is added into the reactor, the waste salt in the reactor is in a boiling state under the blowing of the compressed air, the pressure of the compressed air is 0.5MPa, and the air flow is 10L/min; the waste gas in the fluidized bed reactor can be directly discharged after being treated; discharging after the completion to obtain the treated waste salt.
The dryer is crawler-type drying equipment.
The feeder is a screw feeder.
The treated waste salt can be used as raw materials for refining industrial salt or ionic membrane chlor-alkali.
The waste gas in the boiling bed reactor can be discharged after passing through a full combustion furnace at 800 ℃.
The residual rate of organic matters in the waste salt treated by the experiment is 3.87%, and the purity of sodium chloride is 90.171%.
Comparative example 2
A middle-temperature pyrolysis resource utilization treatment process for medical waste salt comprises the following main schemes:
adding 1kg of anti-caking agent into 1000kg of medical waste salt, mixing and stirring in a mixing kettle for 10min, adding the waste salt into a dryer, controlling the temperature to be 80 ℃, drying for 120min, keeping the content of volatile components such as water, volatile organic solvents and the like in the waste salt to be 0.1%, and slowly adding the waste salt into a medium-temperature reactor by using a feeder at a feeding speed of 50 kg/min; the temperature in the reactor is 350 ℃, and the heating reaction time is 30 min; the temperature of the second section in the reactor is 450 ℃, and the heating reaction time is 40 min; the method is characterized in that the medium-temperature reactor is a boiling bed reactor, compressed air is introduced into the bottom of the reactor after waste salt is added into the reactor, the waste salt in the reactor is in a boiling state under the blowing of the compressed air, the pressure of the compressed air is 0.5MPa, and the air flow is 10L/min; the waste gas in the fluidized bed reactor can be directly discharged after being treated; discharging after the completion to obtain the treated waste salt.
The anticaking agent is an inorganic salt anticaking agent, and the preparation method comprises the following steps:
2kg of cis-quaternary ammonium salt-15, 200kg of white oil, 10kg of 1, 1-dimethyl silicon-based iron and 0.02kg of 1, 3-divinyl-1, 1,3, 3-tetramethyl disiloxane platinum are stirred for 30min at the temperature of 80 ℃, cooled to 40 ℃ and discharged, and the inorganic salt anti-caking agent is obtained.
The dryer is crawler-type drying equipment.
The feeder is a screw feeder.
The treated waste salt can be used as raw materials for refining industrial salt or ionic membrane chlor-alkali.
The waste gas in the boiling bed reactor can be discharged after passing through a full combustion furnace at 800 ℃.
The residual rate of organic matters in the waste salt treated by the experiment is 1.42%, and the purity of sodium chloride is 95.811%.
Comparative example 3
A middle-temperature pyrolysis resource utilization treatment process for medical waste salt comprises the following main schemes:
adding 1kg of anti-caking agent into 1000kg of medical waste salt, mixing and stirring in a mixing kettle for 10min, adding the waste salt into a dryer, controlling the temperature to be 80 ℃, drying for 120min, keeping the content of volatile components such as water, volatile organic solvents and the like in the waste salt to be 0.1%, and slowly adding the waste salt into a medium-temperature reactor by using a feeder at a feeding speed of 50 kg/min; the temperature in the reactor is 350 ℃, and the heating reaction time is 30 min; the temperature of the second section in the reactor is 450 ℃, and the heating reaction time is 40 min; the method is characterized in that the medium-temperature reactor is a boiling bed reactor, compressed air is introduced into the bottom of the reactor after waste salt is added into the reactor, the waste salt in the reactor is in a boiling state under the blowing of the compressed air, the pressure of the compressed air is 0.5MPa, and the air flow is 10L/min; the waste gas in the fluidized bed reactor can be directly discharged after being treated; discharging after the completion to obtain the treated waste salt.
The anticaking agent is an inorganic salt anticaking agent, and the preparation method comprises the following steps:
20kg of cis-9-octadecenylamine, 200kg of white oil, 10kg of 1, 1-dimethyl silicon-based iron and 0.02kg of 1, 3-divinyl-1, 1,3, 3-tetramethyldisiloxane platinum are stirred at the temperature of 80 ℃ for 30min and then cooled to 40 ℃ for discharging, thus obtaining the inorganic salt anti-blocking agent.
The dryer is crawler-type drying equipment.
The feeder is a screw feeder.
The treated waste salt can be used as raw materials for refining industrial salt or ionic membrane chlor-alkali.
The waste gas in the boiling bed reactor can be discharged after passing through a full combustion furnace at 800 ℃.
The residual rate of organic matters in the waste salt treated by the experiment is 1.79 percent, and the purity of sodium chloride is 96.217 percent.
Claims (5)
1. A middle-temperature pyrolysis resource utilization treatment process for medical waste salt comprises the following main schemes:
adding 1-10 parts of anti-caking agent into 1000-1500 parts of medical waste salt by mass, mixing and stirring for 10-60min in a mixing kettle, adding the waste salt into a dryer, controlling the temperature to be 80-130 ℃, drying for 10-120min, keeping the content of water and volatile organic solvent volatile components in the waste salt to be 0.1-5%, and slowly adding the waste salt into a medium-temperature reactor by using a feeder at a feeding speed of 50-80 kg/min; the temperature in the reactor is 350-450 ℃, and the heating reaction time is 5-30 min; the temperature of the second section in the reactor is 450-650 ℃, and the heating reaction time is 10-40 min; the method is characterized in that the medium-temperature reactor is a boiling bed reactor, compressed air is introduced into the bottom of the reactor after waste salt is added into the reactor, the waste salt in the reactor is in a boiling state under the blowing of the compressed air, the pressure of the compressed air is 0.5-2MPa, and the air flow is 10-20L/min; the waste gas in the fluidized bed reactor can be directly discharged after being treated; discharging after the completion to obtain the treated waste salt;
the anticaking agent is an inorganic salt anticaking agent, cis-9-octadecenylamine and cis-quaternary ammonium salt-15 are respectively subjected to hydrosilylation reaction with 1, 1-dimethyl silicon-based iron;
the anticaking agent is an inorganic salt anticaking agent, and the preparation method comprises the following steps:
according to the mass parts, 20-30 parts of cis-9-octadecenylamine, 2-6 parts of cis-quaternary ammonium salt-15, 200-containing white oil, 10-15 parts of 1, 1-dimethyl silicon-based iron, 0.02-0.2 part of 1, 3-divinyl-1, 1,3, 3-tetramethyl disiloxane platinum are controlled at 80-120 ℃, stirred for 30-60min and cooled to 40-60 ℃ for discharging, and the inorganic salt anti-blocking agent can be obtained.
2. The middle-temperature pyrolysis resource utilization treatment process for medical waste salt according to claim 1, characterized in that: the dryer is crawler-type drying equipment or drying oven type drying equipment.
3. The middle-temperature pyrolysis resource utilization treatment process for medical waste salt according to claim 1, characterized in that: the feeder is a screw feeder or a vibration feeder.
4. The middle-temperature pyrolysis resource utilization treatment process for medical waste salt according to claim 1, characterized in that: the treated waste salt can be used as raw materials for refining industrial salt or ionic membrane chlor-alkali.
5. The middle-temperature pyrolysis resource utilization treatment process for medical waste salt according to claim 1, characterized in that: the waste gas in the fluidized bed reactor can be discharged after passing through a full combustion furnace at 800-1000 ℃.
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