CN115140742A - Recycling and disposal method for industrial byproduct mixed salt and hazardous waste combined process - Google Patents
Recycling and disposal method for industrial byproduct mixed salt and hazardous waste combined process Download PDFInfo
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- CN115140742A CN115140742A CN202210710043.3A CN202210710043A CN115140742A CN 115140742 A CN115140742 A CN 115140742A CN 202210710043 A CN202210710043 A CN 202210710043A CN 115140742 A CN115140742 A CN 115140742A
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- 238000000034 method Methods 0.000 title claims abstract description 60
- 239000006227 byproduct Substances 0.000 title claims abstract description 24
- 239000002920 hazardous waste Substances 0.000 title claims abstract description 24
- 150000003839 salts Chemical class 0.000 title claims abstract description 23
- 238000004064 recycling Methods 0.000 title claims abstract description 19
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000011734 sodium Substances 0.000 claims abstract description 37
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000003546 flue gas Substances 0.000 claims abstract description 32
- 239000002699 waste material Substances 0.000 claims abstract description 31
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 26
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims abstract description 24
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 21
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 15
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 claims abstract description 15
- 235000010262 sodium metabisulphite Nutrition 0.000 claims abstract description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 235000010265 sodium sulphite Nutrition 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims abstract description 11
- 229940001584 sodium metabisulfite Drugs 0.000 claims abstract description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 10
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 9
- 239000001301 oxygen Substances 0.000 claims abstract description 9
- 239000003973 paint Substances 0.000 claims abstract description 9
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 7
- 239000000446 fuel Substances 0.000 claims abstract description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 5
- 239000000571 coke Substances 0.000 claims abstract description 5
- 238000002844 melting Methods 0.000 claims abstract description 5
- 230000008018 melting Effects 0.000 claims abstract description 5
- 239000003345 natural gas Substances 0.000 claims abstract description 5
- -1 salt sodium sulfate Chemical class 0.000 claims abstract description 5
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 5
- 239000006004 Quartz sand Substances 0.000 claims abstract description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 239000010703 silicon Substances 0.000 claims abstract description 4
- 239000000126 substance Substances 0.000 claims abstract description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 18
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 239000000047 product Substances 0.000 claims description 5
- 238000004056 waste incineration Methods 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- SGPZTSOKXPIFNO-UHFFFAOYSA-M C(O)(O)=O.[SH-].[Na+] Chemical compound C(O)(O)=O.[SH-].[Na+] SGPZTSOKXPIFNO-UHFFFAOYSA-M 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 claims 1
- 239000002440 industrial waste Substances 0.000 abstract description 2
- MMKVEBPNIHXDCN-UHFFFAOYSA-N [S-2].[Na+].C(O)(O)=O.[Na+] Chemical compound [S-2].[Na+].C(O)(O)=O.[Na+] MMKVEBPNIHXDCN-UHFFFAOYSA-N 0.000 abstract 1
- 229910052979 sodium sulfide Inorganic materials 0.000 description 8
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 5
- 238000006477 desulfuration reaction Methods 0.000 description 5
- 230000023556 desulfurization Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000779 smoke Substances 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/32—Alkali metal silicates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/48—Sulfur dioxide; Sulfurous acid
- C01B17/50—Preparation of sulfur dioxide
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/48—Sulfur dioxide; Sulfurous acid
- C01B17/50—Preparation of sulfur dioxide
- C01B17/501—Preparation of sulfur dioxide by reduction of sulfur compounds
- C01B17/505—Preparation of sulfur dioxide by reduction of sulfur compounds of alkali metal sulfates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/48—Sulfur dioxide; Sulfurous acid
- C01B17/50—Preparation of sulfur dioxide
- C01B17/508—Preparation of sulfur dioxide by oxidation of sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/14—Preparation of sulfites
- C01D5/145—Pyrosulfites or metabisulfites
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a recycling and disposing method of a combined process of industrial byproduct mixed salt and hazardous waste in the technical field of industrial waste disposal, wherein the industrial byproduct mixed salt sodium sulfate, sodium sulfite and sodium sulfide sodium carbonate are used as sodium-based raw materials, quartz sand is used as a silicon-based raw material, waste activated carbon is used as a reducing agent, coke oven gas or natural gas is used as a fuel, and the raw materials enter a negative-pressure total-oxygen decomposing furnace to generate sodium silicate and high-concentration sulfur dioxide high-temperature flue gas under the high-temperature melting condition; high-concentration sulfur dioxide high-temperature flue gas enters a negative pressure roasting furnace, a cut waste paint bucket is added, the flue gas is fully combusted and removed to generate harmless substances, a flue gas outlet discharged from the roasting furnace is cooled in groups through a preheating boiler, generated steam, sodium silicate and sulfur dioxide are supplied to subsequently generated sodium metabisulfite for use, the waste is recycled and utilized in a saving way after process combination, the treatment cost is reduced, and the method has economic popularization value.
Description
Technical Field
The invention relates to the technical field of industrial waste disposal, in particular to a recycling disposal method for a combined process of industrial byproduct mixed salt and hazardous waste.
Background
At present, a large amount of sodium sulfate, sodium sulfite, sodium sulfide and sodium carbonate byproducts are generated in the chemical production and environment-friendly desulfurization treatment processes, and the byproducts are often mixed together. The treatment of the mixed salt is carried out by adopting an evaporative crystallization process at present, a large amount of steam is consumed in the treatment process, the cost is high, the market promotion is difficult, and meanwhile, the evaporative crystallization process is difficult to reach the national hazardous waste discharge standard due to the fact that the mixed salt sometimes contains organic matters (mainly environmental-friendly desulfurization such as desulfurization of a coke-oven plant, and organic matters are contained in flue gas), so that a large amount of industrial byproduct mixed salt is generated, or the mixed salt is not treated or randomly dumped after being stacked for a long time, and a large amount of land is occupied while environmental pollution is caused. The waste activated carbon is treated by incineration according to the existing treatment process of which the national hazardous waste list (2021 edition) hazardous waste code is 900-039-49, and carbon element is used as fuel, so that the waste activated carbon has no resource benefit. The waste paint bucket belongs to dangerous waste, the dangerous useless code is 900-249-08 according to the national dangerous waste list (2021 edition), adopts high temperature incineration treatment at present, needs to consume a large amount of heat energy.
Disclosure of Invention
The invention provides a recycling and disposing method of a combined process of industrial byproduct mixed salt and hazardous waste, which carries out process combined centralized treatment on the industrial byproduct mixed salt (sodium sulfate, sodium sulfite, sodium sulfide and sodium carbonate) and the hazardous waste (non-activated carbon and waste paint bucket) through the combined process, adopts circulating high-temperature flue gas and preheating collection for cyclic utilization, realizes full and comprehensive utilization of resources and energy, greatly reduces the treatment cost of the industrial byproduct mixed salt while reducing energy consumption, environmental protection investment and operating cost, ensures that the treated waste gas reaches the environmental protection emission standard, and ensures that the waste treatment has market popularization value.
The invention provides a recycling and disposal method for a combined process of industrial byproduct mixed salt and hazardous waste, which adopts the following technical scheme:
taking industrial byproduct mixed salt sodium sulfate, sodium sulfite and sodium sulfide carbonate as sodium-based raw materials, quartz sand as a silicon-based raw material, waste activated carbon as a reducing agent and coke oven gas or natural gas as fuel, and feeding the raw materials into a negative-pressure oxy-decomposition furnace to generate sodium silicate and high-concentration sulfur dioxide high-temperature flue gas under the high-temperature melting condition;
high-concentration sulfur dioxide high-temperature flue gas enters a negative pressure roasting furnace, a cut waste paint bucket is added, the flue gas is fully combusted, generated harmless substances are removed, a flue gas outlet discharged from the roasting furnace is cooled in groups through a preheating boiler, and generated steam, sodium silicate and sulfur dioxide are supplied to a subsequent generation of sodium metabisulfite for use.
Optionally, the produced sodium silicate is used for producing products through a chain plate machine.
By adopting the technical scheme, the generated sodium silicate is conveyed to a product production place through the chain plate machine for use.
Optionally, the temperature of the total oxygen decomposition furnace is controlled to be above 1400 ℃.
By adopting the technical scheme, the requirement of the incineration temperature of the hazardous waste is met, the total oxygen ratio is adopted, the air is adopted to reduce the smoke gas generation amount by nearly three quarters, the concentration of sulfur dioxide in the smoke gas reaches more than 240000mg/m < 3 >, and the resource recovery of the sulfur dioxide has economic value.
Optionally, the design of the roasting furnace is to ensure that the temperature of the incinerator is stabilized above 1150 ℃, the residence time of flue gas in the incinerator reaches above 2 seconds, the pollution control standard of hazardous waste incineration (GB 18484-2020) is met, and waste iron after combustion treatment is collected and sold.
By adopting the technical scheme, the products after incineration can be conveniently collected and utilized.
Optionally, the flue gas reduced to 220-250 ℃ is washed, purified and demisted by a washing tower and then is sent to generate sodium metabisulfite, wherein the sodium metabisulfite is generated by taking sodium carbonate as a raw material and introducing sulfur dioxide gas.
By adopting the technical scheme, the sulfur dioxide gas which is washed, purified and demisted by the washing tower and the sodium silicate produced by the total oxygen decomposing furnace react with the steam produced by temperature reduction to generate the sodium pyrosulfite,
optionally, the generated steam is externally supplied to downstream users.
By adopting the technical scheme, the full utilization of energy is achieved.
In summary, the invention includes at least one of the following advantages: compared with the existing treatment of mixed salt of industrial byproducts, the method firstly reduces the treatment cost, has economic popularization value, and simultaneously treats the mixed salt which cannot treat organic matters (mainly environmental-friendly desulfurization such as coking plant desulfurization, because the flue gas contains the organic matters) by adopting the evaporative crystallization process originally, thereby meeting the requirement of environmental-friendly emission. The carbon element can be used as a reducing agent for resource utilization of the waste activated carbon, high-temperature tail flue gas is utilized in the treatment process, the energy consumption is not increased, and meanwhile, a preheating recovery device is adopted in the process, and all generated steam is comprehensively utilized. The process is combined to recycle and save the wastes, the cost is reduced by more than 30 percent compared with the prior treatment cost, and various indexes of the emission of the smoke pollutants completely meet the environmental protection emission standard.
Detailed Description
The present invention will be described in further detail below.
The invention discloses a recycling and disposal method of a combined process of industrial byproduct mixed salt and hazardous waste, which comprises the steps of firstly, recycling industrial byproduct mixed salt sodium sulfate (Na) 2 SO 4 ) Sodium sulfite (Na) 2 SO 3 ) Sodium sulfide (Na) 2 S) sodium carbonate (Na) 2 CO 3 ) As the sodium-based raw material, quartz sand (mainly containing SiO) 2 ) The silicon-based material is a silicon-based raw material, the waste activated carbon is used as a reducing agent, the coke oven gas or natural gas is used as a fuel, and sodium silicate (Na) is generated in a negative-pressure total-oxygen decomposing furnace under the condition of high-temperature melting 2 SiO 3 ) And high-concentration sulfur dioxide high-temperature flue gas. The sodium silicate is used for producing products through a chain plate machine. The reaction principle is that sodium sulfite and sodium carbonate directly react with silicon dioxide to generate sodium silicate, and the reaction formula is as follows:
Na 2 SO 3 +nSiO 2 →Na 2 O·nSiO 2 +SO 2 ↑
Na 2 CO 3 +nSiO 2 →Na 2 O·nSiO 2 +CO 2 ↑，
sodium sulfate in the presence of silica first produces sodium sulfite and a small portion of sodium sulfide in the presence of a carbonaceous reducing agent, the reaction formula being:
Na 2 SO 4 +C→Na 2 SO 3 +CO↑2Na 2 SO 4 +C→2Na 2 SO 3 +CO 2 ↑
Na 2 SO 4 +2C→Na 2 S+2CO 2 ↑，
sodium sulfite generated by reduction reacts with silicon dioxide to generate sodium silicate and release sulfur dioxide, and the reaction formula is as follows:
Na 2 SO 3 +nSiO 2 →Na 2 O·nSiO 2 +SO 2 ↑，
meanwhile, a small part of sodium sulfite generated by reduction is decomposed to generate sodium sulfide, and the reaction formula is as follows:
4Na 2 SO 3 →3Na 2 SO 4 +Na 2 S，
sodium sulfide and sodium sulfate jointly react with silicon dioxide at high temperature to generate sodium silicate and sulfur and release sulfur dioxide, and the reaction formula is as follows:
Na 2 SO 4 +Na 2 S+nSiO 2 →2Na 2 O·nSiO 2 +S+SO 2 ↑，
the process in this stage mainly uses mixed salt sodium sulfate (Na) 2 SO 4 ) Sodium sulfite (Na) 2 SO 3 ) Sodium sulfide (Na) 2 S) sodium carbonate (Na) 2 CO 3 ) Can be used as a raw material for producing sodium silicate, can perform resource utilization of wastes by adding reducing agent waste activated carbon, and mainly ensures that combustion flue gas of organic matters in the waste activated carbon is not exposed to the air by adopting negative pressure operation. The total oxygen decomposing furnace is adopted to mainly ensure that the temperature of the decomposing furnace is stabilized above 1400 ℃, the requirement of the incineration temperature of the hazardous wastes is met, meanwhile, the total oxygen ratio is adopted, air is adopted to reduce the generation amount of the flue gas by nearly three quarters, and the concentration of sulfur dioxide in the flue gas reaches 240000mg/m 3 Therefore, the method has economic value for recycling the sulfur dioxide.
And (3) enabling the subsequent high-temperature sulfur dioxide outlet flue gas to have a temperature of over 1360 ℃, enabling the flue gas to enter a roasting furnace (under negative pressure), adding the cut waste paint bucket, and fully burning and removing organic matters in the waste paint bucket by the high-temperature flue gas to generate harmless substances, mainly water and carbon dioxide. The organic matter burning paint in the process is operated by feeding negative pressure, the temperature of the incinerator is ensured to be stabilized above 1150 ℃ by the design of the roasting furnace, the residence time of smoke in the incinerator reaches above 2 seconds, the hazardous waste burning pollution control standard (GB 18484-2020) is met, and waste iron after burning treatment is collected and sold. The temperature of a flue gas outlet from the roasting furnace is over 1150 ℃, and the flue gas is divided into a plurality of sections by a preheating boilerCooling the assembly, and supplying the generated steam to subsequent sodium pyrosulfite (Na) 2 S 2 O 5 ) And sodium silicate (Na) 2 SiO 3 ) Dissolving the materials, cooling to 220-250 deg.C, washing, purifying, demisting, and making sodium pyrosulfite (Na) 2 S 2 O 5 ) The generation of sodium metabisulfite adopts current mature technology, uses sodium carbonate as raw materials, produces sodium metabisulfite after letting in sulfur dioxide gas, and the reaction formula is:
Na 2 CO 3 +SO 2 →Na 2 S 2 O 5 +CO 2 ↑，
the required steam source of this section production technology is all provided by anterior segment preheating boiler, and the steam that will preheat the boiler and produce through accurate design back uses as sodium silicate and sodium metabisulfite, perhaps supplies downstream user outward, reaches the make full use of the energy.
The process uses industrial by-product sodium sulfate (Na) as mixed salt 2 SO 4 ) Sodium sulfite (Na) 2 SO 3 ) Sodium sulfide (Na) 2 S) sodium carbonate (Na) 2 CO 3 ) And waste activated carbon are mixed, coke oven gas or natural gas is used as fuel, and sodium silicate (Na) is generated in a negative pressure total oxygen decomposing furnace under the condition of high-temperature melting 2 SiO 3 ) And high-temperature flue gas containing high-concentration sulfur dioxide, transferring sodium in the mixed salt into sodium silicate, and supplying sulfur generated into sulfur dioxide to a subsequent working section to generate sodium pyrosulfite. The high-temperature flue gas of the decomposing furnace is used as a heat source for treating waste activated carbon and waste paint buckets by a back-end process, so that the full and comprehensive utilization of resources and energy sources is realized, the production cost is reduced, the marketable popularization value of waste disposal is realized, the pollution control standard of hazardous waste incineration is met, and the process is an energy-saving and environment-friendly novel waste disposal process.
The invention combines the processes of sodium silicate production, hazardous waste incineration and sodium metabisulfite production, carries out resource utilization and economical utilization of waste, carries out industrial tests on the river jin city of Shanxi province according to main process node parameters, has stable process flow, reduces the cost by more than 30 percent compared with the prior treatment cost, and completely meets the environmental-friendly emission standard of various indexes of smoke pollutant emission.
The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (6)
1. The combined process recycling and disposal method of the industrial byproduct mixed salt and the hazardous waste is characterized by comprising the following steps: the method comprises the following steps:
taking industrial byproduct mixed salt sodium sulfate, sodium sulfite and sodium sulfide carbonate as sodium-based raw materials, quartz sand as a silicon-based raw material, waste activated carbon as a reducing agent and coke oven gas or natural gas as fuel, and feeding the raw materials into a negative-pressure oxy-decomposition furnace to generate sodium silicate and high-concentration sulfur dioxide high-temperature flue gas under the high-temperature melting condition;
high-concentration sulfur dioxide high-temperature flue gas enters a negative pressure roasting furnace, a cut waste paint bucket is added, the flue gas is fully combusted, generated harmless substances are removed, a flue gas outlet discharged from the roasting furnace is cooled in groups through a preheating boiler, and generated steam, sodium silicate and sulfur dioxide are supplied to a subsequent generation of sodium metabisulfite for use.
2. The combined process recycling and disposal method for industrial byproduct mixed salt and hazardous waste according to claim 1, wherein the method comprises the following steps: the produced sodium silicate is used for producing products through a chain plate machine.
3. The combined process recycling and disposal method for industrial byproduct mixed salt and hazardous waste according to claim 1, wherein the combined process recycling and disposal method comprises the following steps: the temperature of the total oxygen decomposing furnace is controlled to be more than 1400 ℃.
4. The combined process recycling and disposal method for industrial byproduct mixed salt and hazardous waste according to claim 1, wherein the combined process recycling and disposal method comprises the following steps: the design of the roasting furnace ensures that the temperature of the incinerator is stabilized above 1150 ℃, the retention time of flue gas in the incinerator reaches above 2 seconds, the pollution control standard of hazardous waste incineration is met, and waste iron after combustion treatment is collected and sold.
5. The combined process recycling and disposal method for industrial byproduct mixed salt and hazardous waste according to claim 1, wherein the combined process recycling and disposal method comprises the following steps: and (3) washing, purifying and demisting the flue gas reduced to 220-250 ℃ by a washing tower, and then sending the flue gas into a washing tower to generate sodium metabisulfite, wherein the sodium metabisulfite is generated by taking sodium carbonate as a raw material and introducing sulfur dioxide gas.
6. The combined process recycling and disposal method for industrial byproduct mixed salt and hazardous waste according to claim 1, wherein the combined process recycling and disposal method comprises the following steps: and the generated steam is externally supplied to downstream users.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210710043.3A CN115140742A (en) | 2022-06-22 | 2022-06-22 | Recycling and disposal method for industrial byproduct mixed salt and hazardous waste combined process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210710043.3A CN115140742A (en) | 2022-06-22 | 2022-06-22 | Recycling and disposal method for industrial byproduct mixed salt and hazardous waste combined process |
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| Publication Number | Publication Date |
|---|---|
| CN115140742A true CN115140742A (en) | 2022-10-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210710043.3A Pending CN115140742A (en) | 2022-06-22 | 2022-06-22 | Recycling and disposal method for industrial byproduct mixed salt and hazardous waste combined process |
Country Status (1)
| Country | Link |
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| CN (1) | CN115140742A (en) |
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2022
- 2022-06-22 CN CN202210710043.3A patent/CN115140742A/en active Pending
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