CN113184845A - Method for co-processing organic nitrogen-containing compound in cement kiln - Google Patents
Method for co-processing organic nitrogen-containing compound in cement kiln Download PDFInfo
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Abstract
The invention relates to the field of waste treatment, and discloses a method for cooperatively treating organic nitrogen compounds in a cement kiln, which comprises the following steps: preparing an adsorption material, mixing adsorption, performing synergistic carbonization, activating treatment and the like; according to the invention, nitrogen atoms contained in the organic solid waste can be used as endogenous dopants, so that the performance of the final carbon material is improved, no additional dopants are needed, the emission of nitrogen oxides is not solved, and the problem of resource recycling is solved; the method of the invention fully utilizes nitrogen elements in the waste, plant waste and cement kiln decomposition hot gas, and is a waste treatment method combining resource saving and waste utilization.
Description
Technical Field
The invention relates to the field of waste treatment, in particular to a method for cooperatively treating organic nitrogen compounds in a cement kiln.
Background
In the production of medicine and fine chemical industry, a large amount of toxic and harmful solid and semi-solid nitrogen-containing organic wastes are generated, and the basic treatment method is burying, low-temperature plasma technology or incineration. These techniques all suffer from serious hazardous box drawbacks.
CN105541418A relates to a method for treating nitrogen-containing organic waste by using concentrated sulfuric acid, belonging to the technical field of organic waste treatment. The method for treating the nitrogen-containing organic waste by using the concentrated sulfuric acid is characterized in that the solid or semi-solid nitrogen-containing organic waste is dehydrated and carbonized under the action of the concentrated sulfuric acid, nitrogen atoms in the waste react with the concentrated sulfuric acid to generate ammonium bisulfate, and then the resultant is subjected to post-treatment to obtain ammonium sulfate. The invention reduces the treatment cost of solid and semi-solid nitrogen-containing organic wastes and achieves the aims of waste treatment and comprehensive utilization.
CN105003916B relates to an organic waste treatment furnace, has the outer furnace body of L shape of horizontal extension cavity and vertical extension cavity, and the jar body sets up on vertical extension cavity, makes combustion chamber and heating chamber lug connection, has greatly reduced the occupation space of the outer furnace body of L shape, makes the structure compacter. In addition, the lateral heating channel surrounds the outer lateral wall of the tank body, the bottom heating channel covers the bottom of the heating tank body, after high-temperature gas from the horizontal extension cavity enters the vertical extension cavity, the bottom of the tank body is heated through the bottom heating channel, and meanwhile, the lateral wall of the tank body is synchronously heated through the lateral heating channel surrounding the outer lateral wall of the tank body along the circumferential direction, so that all outer walls of the tank body in the vertical extension cavity can be uniformly heated by the high-temperature gas, and meanwhile, the carbonization of organic waste in the tank body is more uniform.
CN102399093B discloses an organic waste processor, which comprises a main frame body and fixing panels on the outer surfaces of the main frame body, wherein the upper panel is provided with a turnover cover with a seal, and the left side of the upper panel is provided with a display screen; the upper part of the side panel is provided with a water inlet and an air outlet, the lower part of the side panel is provided with a water outlet, and the water inlet, the air outlet and the water outlet are connected with the deodorization tower; the lower part of the front panel is provided with a discharge hole with a seal; the internal reaction storehouse body that is provided with of body frame, the internal (mixing) shaft that is provided with of reaction storehouse, the (mixing) shaft includes a stirring axle, stirs epaxial blade that is provided with of material, stirs the stirring vane head at material axle both ends and is equipped with the mainboard perpendicular with the blade, and the mainboard distributes in the both sides of blade, and wherein one side is shorter, and the opposite side is connected with stirring axle contact. The invention puts the waste and the decomposing bacteria into the reaction bin body according to a certain proportion, and the waste and the decomposing bacteria are uniformly reacted in the process of continuous stirring and constant temperature, thereby converting the organic waste into useful organic fertilizer and avoiding secondary pollution.
The treatment methods of organic waste mainly include a burying treatment method, low-temperature plasma, an incineration method and the like but have many disadvantages; the burying treatment method occupies a large amount of land and is easy to leak and pollute the land and water sources; the low-temperature plasma technology has high operation cost, large equipment investment and small processing capacity; although the incineration method is greatly improved for treating nitrogen-containing wastes, NOx waste gas is generated, and post-treatment absorption equipment is required to be added, so that the treatment cost is increased. Most products of medicine and fine chemical industry contain nitrogen element, and if the common treatment method is adopted, the problems of high cost, easy secondary pollution and the like can be caused.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method for co-processing an organic nitrogen compound-containing compound in a cement kiln.
A method for cooperatively treating organic nitrogen compounds in a cement kiln comprises the following steps:
step one, preparation of an adsorption material: uniformly mixing 50-80 parts of straw powder and 10-30 parts of saw powder in parts by weight, adding 5-12 parts of maleic anhydride aqueous solution into the mixed powder, adding the mixed powder into a closed reactor, introducing nitrogen, reacting at 100 ℃ and 120 ℃ for 30-60min, cooling to room temperature after completion, adding 0.5-1.2 parts of 5-10% acid liquor by mass, stirring and reacting at 40-80 ℃ for 60-120min, filtering and drying, then putting the mixture into 100-200 parts of white oil, adding 5-9 parts of alpha, omega-dimercaptopolyethylene glycol, 3.5-6.8 parts of ferric acrylate and 2-5 parts of sodium methoxide, stirring and reacting for 40-100min at the temperature of 50-60 ℃, filtering after completion, recycling the filtrate, and drying to obtain the adsorbing material containing the nitrogen organic waste;
step two, mixed adsorption: adding 50-80 parts of organic nitrogen compound-containing waste and 100-120 parts of adsorbing material into a mixing stirrer according to the mass parts, then mixing and stirring for 30-60min at the rotating speed of 50-100r/min, uniformly mixing the waste and the adsorbing material, and drying at the temperature of 80-100 ℃ for 5-10h to obtain a mixture;
step three, synergetic carbonization: conveying the mixture into a carbonization device, wherein the carbonization device is of a sandwich structure, the exterior of the carbonization device is provided with a refractory heat-insulating material, the inner layer bears the mixture and is provided with an air inlet pipe, the top end of the carbonization device is provided with a flue gas pipe, and the sandwich layer is provided with a ventilation pipe leading to a cement kiln; the ventilation pipe guides the hot air with the temperature of 750-850 ℃ in the cement kiln decomposition system into an interlayer of carbonization equipment, and the mixture is heated and carbonized, wherein the carbonization is carried out in an inert atmosphere for 1-5 h;
step four, activation treatment: crushing the carbonized mixture and adding the crushed mixture into an activation device, wherein the activation device is of a sandwich structure, the exterior of the activation device is provided with a refractory heat-insulating material, the inner layer bears the mixture and is provided with an air inlet pipe, the top end of the activation device is provided with a flue gas pipe, and the sandwich layer is provided with a ventilation pipe leading to a cement kiln; the ventilation pipe guides the hot air with the temperature of 750-850 ℃ in the cement kiln decomposition system into an interlayer of the activation equipment, the mixture is heated and activated, the activation is carried out in the activation atmosphere, the reaction time is 60-180min, and the nitrogen-doped activated carbon material is obtained after the completion.
The maleic anhydride aqueous solution contains 8-12% of maleic anhydride and 10-15% of acetic acid in parts by weight.
The inert atmosphere is a mixed gas of carbon dioxide and nitrogen in a volume ratio of 1: 2-5.
The activating atmosphere is mixed gas with the volume ratio of hydrogen to nitrogen being 1: 8-12.
The acid solution is hydrochloric acid solution, nitric acid solution or sulfuric acid solution.
The reaction mechanism of the adsorbing material of the nitrogen-containing organic waste material is as follows:
the maleic acid modified straw powder and sawdust cellulose are subjected to Michael addition reaction with alpha, omega-dimercaptopolyethylene glycol and iron acrylate, and the partial reaction equation is shown as follows:
the invention discloses a method for co-processing organic nitrogen compounds in a cement kiln, which is characterized in that waste materials containing the organic nitrogen compounds and an acid anhydride modified adsorption material are uniformly mixed and then carbonized under the co-processing of the cement kiln to obtain a nitrogen-doped activated carbon material, and the material has wide application in the aspects of energy storage and conversion, catalysis, carbon dioxide curing and the like. According to the invention, nitrogen atoms contained in the organic solid waste can be used as endogenous dopants, so that the performance of the final carbon material is improved, no additional dopants are needed, the emission of nitrogen oxides is not solved, and the problem of resource recycling is solved; the prepared anhydride modified adsorption material is obtained by modifying plant wastes such as straw powder and the like with maleic anhydride, has a good adsorption effect on nitrogen-containing organic wastes, and can achieve the purpose of uniform doping. The method of the invention fully utilizes nitrogen elements in the waste, plant waste and cement kiln decomposition hot gas, and is a waste treatment method combining resource saving and waste utilization.
Drawings
FIG. 1 is a Fourier infrared spectrum of the adsorbent material of nitrogen-containing organic waste material prepared in example 2;
at 2907cm-1The expansion absorption peak of carbon-hydrogen bond is at 1063cm-1An antisymmetric telescopic absorption peak of ether bond at 3414cm-1The absorption peak of hydroxyl exists nearby, which indicates that the straw isThe powder and the sawdust participate in the reaction; at 1131cm-1An antisymmetric stretching absorption peak of ether bond at 720cm-1An absorption peak of a carbon-sulfur bond exists nearby, which indicates that the alpha, omega-dimercapto polyethylene glycol participates in the reaction; at 1451cm-1An antisymmetric telescopic absorption peak of carboxylate ions exists nearby, which indicates that the iron acrylate participates in the reaction; at 1730cm-1The absorption peak of carbonyl exists nearby, which indicates that maleic anhydride participates in the reaction.
Detailed Description
The invention is further illustrated by the following specific examples:
example 1
A method for cooperatively treating organic nitrogen compounds in a cement kiln comprises the following steps:
step one, preparation of an adsorption material: uniformly mixing 50kg of straw powder and 10kg of sawdust, adding 5kg of maleic anhydride aqueous solution with the mass percentage concentration of 15% into the mixed powder, then adding the mixed powder into a closed reactor, introducing nitrogen, reacting for 30min at 100 ℃, cooling to room temperature after completion, adding 0.5kg of 5% acid solution, stirring and reacting for 60min at the temperature of 40 ℃, drying after filtration, then adding into 100kg of white oil, adding 5kg of alpha, omega-dimercaptopolyethylene glycol, 3.5kg of ferric acrylate and 2kg of sodium methoxide, stirring and reacting for 40min at the temperature of 50 ℃, filtering after completion, recycling the filtrate, and drying to obtain the nitrogen-containing organic waste adsorbing material;
step two, mixed adsorption: adding 50kg of organic nitrogen compound-containing waste and 100kg of adsorbing material into a mixing stirrer, then mixing and stirring for 30min at the rotating speed of 50r/min, uniformly mixing the waste and the adsorbing material, and drying at 80 ℃ for 5h to obtain a mixture;
step three, synergetic carbonization: conveying the mixture into a carbonization device, wherein the carbonization device is of a sandwich structure, the exterior of the carbonization device is provided with a refractory heat-insulating material, the inner layer bears the mixture and is provided with an air inlet pipe, the top end of the carbonization device is provided with a flue gas pipe, and the sandwich layer is provided with a ventilation pipe leading to a cement kiln; the ventilation pipe guides 750 ℃ hot air in a cement kiln decomposition system into an interlayer of carbonization equipment, and the mixture is heated and carbonized, wherein the carbonization is carried out in an inert atmosphere, and the reaction time is 1 h;
step four, activation treatment: crushing the carbonized mixture and adding the crushed mixture into an activation device, wherein the activation device is of a sandwich structure, the exterior of the activation device is provided with a refractory heat-insulating material, the inner layer bears the mixture and is provided with an air inlet pipe, the top end of the activation device is provided with a flue gas pipe, and the sandwich layer is provided with a ventilation pipe leading to a cement kiln; the ventilation pipe guides 750 ℃ hot air in a cement kiln decomposition system into an interlayer of activation equipment, the mixture is heated and activated, the activation is carried out in an activation atmosphere, the reaction time is 60min, and the nitrogen-doped activated carbon material is obtained after the activation is finished.
The aqueous maleic anhydride solution contains 8% by mass kg of maleic anhydride and 10% by mass kg of acetic acid.
The inert atmosphere is mixed gas of carbon dioxide and nitrogen in a volume ratio of 1: 2.
The activating atmosphere is mixed gas with the volume ratio of hydrogen to nitrogen being 1: 8.
The acid solution is hydrochloric acid solution.
Example 2
A method for cooperatively treating organic nitrogen compounds in a cement kiln comprises the following steps:
step one, preparation of an adsorption material: uniformly mixing 65kg of straw powder and 20kg of sawdust, adding 9kg of maleic anhydride aqueous solution with the mass percentage concentration of 20% into the mixed powder, then adding the mixed powder into a closed reactor, introducing nitrogen, reacting for 45min at 110 ℃, cooling to room temperature after completion, adding 0.9kg of 8% acid solution, stirring and reacting for 90min at the temperature of 60 ℃, drying after filtration, then putting into 150kg of white oil, adding 7kg of alpha, omega-dimercaptopolyethylene glycol, 5.2kg of ferric acrylate and 4kg of sodium methoxide, stirring and reacting for 70min at the temperature of 55 ℃, filtering after completion, recycling the filtrate, and drying to obtain the nitrogen-containing organic waste adsorbing material;
step two, mixed adsorption: adding 65kg of organic nitrogen compound-containing waste and 110kg of adsorbing material into a mixing stirrer, then mixing and stirring for 40min at the rotating speed of 80r/min, uniformly mixing the waste and the adsorbing material, and drying the mixture at 90 ℃ for 8h to obtain a mixture;
step three, synergetic carbonization: conveying the mixture into a carbonization device, wherein the carbonization device is of a sandwich structure, the exterior of the carbonization device is provided with a refractory heat-insulating material, the inner layer bears the mixture and is provided with an air inlet pipe, the top end of the carbonization device is provided with a flue gas pipe, and the sandwich layer is provided with a ventilation pipe leading to a cement kiln; the ventilation pipe guides hot air at 800 ℃ in a cement kiln decomposition system into an interlayer of carbonization equipment, and the mixture is heated and carbonized, wherein the carbonization is carried out in an inert atmosphere, and the reaction time is 3 hours;
step four, activation treatment: crushing the carbonized mixture and adding the crushed mixture into an activation device, wherein the activation device is of a sandwich structure, the exterior of the activation device is provided with a refractory heat-insulating material, the inner layer bears the mixture and is provided with an air inlet pipe, the top end of the activation device is provided with a flue gas pipe, and the sandwich layer is provided with a ventilation pipe leading to a cement kiln; the ventilation pipe guides hot air at 800 ℃ in a cement kiln decomposition system into an interlayer of activation equipment, the mixture is heated and activated, the activation is carried out in an activation atmosphere, the reaction time is 120min, and the nitrogen-doped activated carbon material is obtained after the activation.
The aqueous maleic anhydride solution contains 10% by mass kg of maleic anhydride and 13% by mass kg of acetic acid.
The inert atmosphere is mixed gas of carbon dioxide and nitrogen in a volume ratio of 1: 3.5.
The activating atmosphere is mixed gas with the volume ratio of hydrogen to nitrogen being 1: 10.
The acid solution is nitric acid solution.
Example 3
A method for cooperatively treating organic nitrogen compounds in a cement kiln comprises the following steps:
step one, preparation of an adsorption material: uniformly mixing 80kg of straw powder and 30kg of sawdust, adding 12kg of maleic anhydride aqueous solution with the mass percentage concentration of 25% into the mixed powder, then adding the mixed powder into a closed reactor, introducing nitrogen, reacting for 60min at 120 ℃, cooling to room temperature after completion, adding 1.2kg of 10% acid solution, stirring and reacting for 120min at the temperature of 80 ℃, drying after filtration, then adding into 200kg of white oil, adding 9kg of alpha, omega-dimercaptopolyethylene glycol, 6.8kg of ferric acrylate and 5kg of sodium methoxide, stirring and reacting for 100min at the temperature of 60 ℃, filtering after completion, recycling the filtrate, and drying to obtain the adsorbing material containing the nitrogen organic waste;
step two, mixed adsorption: adding 80kg of waste containing organic nitrogen compounds and 120kg of adsorbing materials into a mixing stirrer, then mixing and stirring for 60min at the rotating speed of 100r/min, uniformly mixing the waste and the adsorbing materials, and drying at 100 ℃ for 10h to obtain a mixture;
step three, synergetic carbonization: conveying the mixture into a carbonization device, wherein the carbonization device is of a sandwich structure, the exterior of the carbonization device is provided with a refractory heat-insulating material, the inner layer bears the mixture and is provided with an air inlet pipe, the top end of the carbonization device is provided with a flue gas pipe, and the sandwich layer is provided with a ventilation pipe leading to a cement kiln; the ventilation pipe guides 850 ℃ hot air in a cement kiln decomposition system into an interlayer of carbonization equipment, and the mixture is heated and carbonized in an inert atmosphere for 5 hours;
step four, activation treatment: crushing the carbonized mixture and adding the crushed mixture into an activation device, wherein the activation device is of a sandwich structure, the exterior of the activation device is provided with a refractory heat-insulating material, the inner layer bears the mixture and is provided with an air inlet pipe, the top end of the activation device is provided with a flue gas pipe, and the sandwich layer is provided with a ventilation pipe leading to a cement kiln; the ventilation pipe guides 850 ℃ hot air in a cement kiln decomposition system into an interlayer of activation equipment, the mixture is heated and activated, the activation is carried out in an activation atmosphere, the reaction time is 180min, and the nitrogen-doped activated carbon material is obtained after the activation.
The maleic anhydride aqueous solution contains 12% by mass kg of maleic anhydride and 15% by mass kg of acetic acid.
The inert atmosphere is mixed gas of carbon dioxide and nitrogen in a volume ratio of 1: 5.
The activating atmosphere is mixed gas with the volume ratio of hydrogen to nitrogen being 1: 12.
The acid solution is sulfuric acid solution.
Adopting a full-automatic specific surface analyzer to test the nitrogen absorption and desorption curve of the material, and carrying out phase separation at-196 DEG CTo pressure of 3.5X 10-70.99. The material was first degassed at 300 ℃ for 6 h. The specific surface area is obtained by fitting according to a BET model. And analyzing the content of nitrogen elements in the activated carbon material by an element analyzer. The test results are shown in the following table:
| specific surface area (m)2·g-1） | Nitrogen content (%) | |
| Example 1 | 1475 | 6.81 |
| Example 2 | 1639 | 7.28 |
| Example 3 | 1751 | 7.39 |
Comparative example 1
A method for cooperatively treating organic nitrogen compounds in a cement kiln comprises the following steps:
step one, preparation of an adsorption material: uniformly mixing 50kg of straw powder and 10kg of sawdust to obtain an adsorbing material containing nitrogen organic waste;
step two, mixed adsorption: adding 50kg of organic nitrogen compound-containing waste and 100kg of adsorbing material into a mixing stirrer, then mixing and stirring for 30min at the rotating speed of 50r/min, uniformly mixing the waste and the adsorbing material, and drying at 80 ℃ for 5h to obtain a mixture;
step three, synergetic carbonization: conveying the mixture into a carbonization device, wherein the carbonization device is of a sandwich structure, the exterior of the carbonization device is provided with a refractory heat-insulating material, the inner layer bears the mixture and is provided with an air inlet pipe, the top end of the carbonization device is provided with a flue gas pipe, and the sandwich layer is provided with a ventilation pipe leading to a cement kiln; the ventilation pipe guides 750 ℃ hot air in a cement kiln decomposition system into an interlayer of carbonization equipment, and the mixture is heated and carbonized, wherein the carbonization is carried out in an inert atmosphere, and the reaction time is 1 h;
step four, activation treatment: crushing the carbonized mixture and adding the crushed mixture into an activation device, wherein the activation device is of a sandwich structure, the exterior of the activation device is provided with a refractory heat-insulating material, the inner layer bears the mixture and is provided with an air inlet pipe, the top end of the activation device is provided with a flue gas pipe, and the sandwich layer is provided with a ventilation pipe leading to a cement kiln; the ventilation pipe guides 750 ℃ hot air in a cement kiln decomposition system into an interlayer of activation equipment, the mixture is heated and activated, the activation is carried out in an activation atmosphere, the reaction time is 60min, and the nitrogen-doped activated carbon material is obtained after the activation is finished.
The inert atmosphere is mixed gas of carbon dioxide and nitrogen in a volume ratio of 1: 2.
The activating atmosphere is mixed gas with the volume ratio of hydrogen to nitrogen being 1: 8.
Comparative example 2
A method for cooperatively treating organic nitrogen compounds in a cement kiln comprises the following steps:
step one, preparation of an adsorption material: uniformly mixing 50kg of straw powder and 10kg of sawdust, adding 5kg of maleic anhydride aqueous solution into the mixed powder, then adding the mixed powder into a closed reactor, reacting for 30min at 100 ℃, and drying at 80 ℃ after reaction to obtain the nitrogen-containing organic waste adsorbing material;
step two, mixed adsorption: adding 50kg of organic nitrogen compound-containing waste and 100kg of adsorbing material into a mixing stirrer, then mixing and stirring for 30min at the rotating speed of 50r/min, uniformly mixing the waste and the adsorbing material, and drying at 80 ℃ for 5h to obtain a mixture;
step three, synergetic carbonization: conveying the mixture into a carbonization device, wherein the carbonization device is of a sandwich structure, the exterior of the carbonization device is provided with a refractory heat-insulating material, the inner layer bears the mixture and is provided with an air inlet pipe, the top end of the carbonization device is provided with a flue gas pipe, and the sandwich layer is provided with a ventilation pipe leading to a cement kiln; the ventilation pipe guides 750 ℃ hot air in a cement kiln decomposition system into an interlayer of carbonization equipment, and the mixture is heated and carbonized, wherein the carbonization is carried out in an inert atmosphere, and the reaction time is 1 h;
step four, activation treatment: crushing the carbonized mixture and adding the crushed mixture into an activation device, wherein the activation device is of a sandwich structure, the exterior of the activation device is provided with a refractory heat-insulating material, the inner layer bears the mixture and is provided with an air inlet pipe, the top end of the activation device is provided with a flue gas pipe, and the sandwich layer is provided with a ventilation pipe leading to a cement kiln; the ventilation pipe guides 750 ℃ hot air in a cement kiln decomposition system into an interlayer of activation equipment, the mixture is heated and activated, the activation is carried out in an activation atmosphere, the reaction time is 60min, and the nitrogen-doped activated carbon material is obtained after the activation is finished.
The aqueous maleic anhydride solution contains 8% maleic anhydride and 10% acetic acid.
The inert atmosphere is mixed gas of carbon dioxide and nitrogen in a volume ratio of 1: 2.
The activating atmosphere is mixed gas with the volume ratio of hydrogen to nitrogen being 1: 8.
Comparative example 3
A method for cooperatively treating organic nitrogen compounds in a cement kiln comprises the following steps:
step one, preparation of an adsorption material: uniformly mixing 50kg of straw powder and 10kg of sawdust, adding 5kg of maleic anhydride aqueous solution with the mass percentage concentration of 15% into the mixed powder, then adding the mixed powder into a closed reactor, introducing nitrogen, reacting for 30min at 100 ℃, cooling to room temperature after completion, adding 0.5kg of 5% acid solution, stirring and reacting for 60min at the temperature of 40 ℃, drying after filtration, then adding into 100kg of white oil, adding 5kg of alpha, omega-dimercaptopolyethylene glycol and 2kg of sodium methoxide, stirring and reacting for 40min at the temperature of 50 ℃, filtering after completion, recycling the filtrate, and drying to obtain the adsorbing material containing the nitrogen organic waste;
step two, mixed adsorption: adding 50kg of organic nitrogen compound-containing waste and 100kg of adsorbing material into a mixing stirrer, then mixing and stirring for 30min at the rotating speed of 50r/min, uniformly mixing the waste and the adsorbing material, and drying at 80 ℃ for 5h to obtain a mixture;
step three, synergetic carbonization: conveying the mixture into a carbonization device, wherein the carbonization device is of a sandwich structure, the exterior of the carbonization device is provided with a refractory heat-insulating material, the inner layer bears the mixture and is provided with an air inlet pipe, the top end of the carbonization device is provided with a flue gas pipe, and the sandwich layer is provided with a ventilation pipe leading to a cement kiln; the ventilation pipe guides 750 ℃ hot air in a cement kiln decomposition system into an interlayer of carbonization equipment, and the mixture is heated and carbonized, wherein the carbonization is carried out in an inert atmosphere, and the reaction time is 1 h;
step four, activation treatment: crushing the carbonized mixture and adding the crushed mixture into an activation device, wherein the activation device is of a sandwich structure, the exterior of the activation device is provided with a refractory heat-insulating material, the inner layer bears the mixture and is provided with an air inlet pipe, the top end of the activation device is provided with a flue gas pipe, and the sandwich layer is provided with a ventilation pipe leading to a cement kiln; the ventilation pipe guides 750 ℃ hot air in a cement kiln decomposition system into an interlayer of activation equipment, the mixture is heated and activated, the activation is carried out in an activation atmosphere, the reaction time is 60min, and the nitrogen-doped activated carbon material is obtained after the activation is finished.
The aqueous maleic anhydride solution contained 8% maleic anhydride.
The inert atmosphere is mixed gas of carbon dioxide and nitrogen in a volume ratio of 1: 2.
The activating atmosphere is mixed gas with the volume ratio of hydrogen to nitrogen being 1: 8.
The acid solution is hydrochloric acid solution.
And analyzing the content of nitrogen element and the specific surface area in the activated carbon material. The test results are shown in the following table:
| specific surface area (m)2·g-1） | Nitrogen content (%) | |
| Comparative example 1 | 972 | 3.57 |
| Comparative example 2 | 1086 | 5.39 |
| Comparative example 3 | 1305 | 6.23 |
Claims (7)
1. A method for co-processing organic nitrogen compounds by a cement kiln is characterized by providing a preparation method of an adsorption material of nitrogen-containing organic waste materials, which comprises the following steps: wherein the maleic acid modified straw powder and the saw powder cellulose are subjected to Michael addition reaction with alpha, omega-dimercaptopolyethylene glycol and ferric acrylate,
2. the method for the cooperative disposal of organic nitrogen compounds in a cement kiln according to claim 1, wherein a method for preparing an adsorbing material of organic waste materials containing nitrogen is provided: uniformly mixing 50-80 parts of straw powder and 10-30 parts of saw powder in parts by weight, adding 5-12 parts of maleic anhydride aqueous solution into the mixed powder, adding the mixed powder into a closed reactor, introducing nitrogen, reacting at 100 ℃ and 120 ℃ for 30-60min, cooling to room temperature after completion, adding 0.5-1.2 parts of 5-10% acid liquor by mass, stirring and reacting at 40-80 ℃ for 60-120min, filtering and drying, then putting the mixture into 100-200 parts of white oil, adding 5-9 parts of alpha, omega-dimercaptopolyethylene glycol, 3.5-6.8 parts of ferric acrylate and 2-5 parts of sodium methoxide, stirring and reacting for 40-100min at the temperature of 50-60 ℃, filtering after completion, recycling the filtrate, and drying to obtain the adsorbing material containing the nitrogen organic waste.
3. The method for the co-disposal of organic nitrogen-containing compounds in a cement kiln according to claim 1, characterized in that the method for the co-disposal of organic nitrogen-containing compounds is:
mixing and adsorbing: adding 50-80 parts of organic nitrogen compound-containing waste and 100-120 parts of adsorbing material into a mixing stirrer according to the mass parts, then mixing and stirring for 30-60min at the rotating speed of 50-100r/min, uniformly mixing the waste and the adsorbing material, and drying at the temperature of 80-100 ℃ for 5-10h to obtain a mixture;
and (3) synergistic carbonization: conveying the mixture into a carbonization device, wherein the carbonization device is of a sandwich structure, the exterior of the carbonization device is provided with a refractory heat-insulating material, the inner layer bears the mixture and is provided with an air inlet pipe, the top end of the carbonization device is provided with a flue gas pipe, and the sandwich layer is provided with a ventilation pipe leading to a cement kiln; the ventilation pipe guides the hot air with the temperature of 750-850 ℃ in the cement kiln decomposition system into an interlayer of carbonization equipment, and the mixture is heated and carbonized, wherein the carbonization is carried out in an inert atmosphere for 1-5 h;
activation treatment: crushing the carbonized mixture and adding the crushed mixture into an activation device, wherein the activation device is of a sandwich structure, the exterior of the activation device is provided with a refractory heat-insulating material, the inner layer bears the mixture and is provided with an air inlet pipe, the top end of the activation device is provided with a flue gas pipe, and the sandwich layer is provided with a ventilation pipe leading to a cement kiln; the ventilation pipe guides the hot air with the temperature of 750-850 ℃ in the cement kiln decomposition system into an interlayer of the activation equipment, the mixture is heated and activated, the activation is carried out in the activation atmosphere, the reaction time is 60-180min, and the nitrogen-doped activated carbon material is obtained after the completion.
4. The method for co-processing organic nitrogen compound with cement kiln as claimed in claim 2, wherein: the maleic anhydride aqueous solution contains 8-12% of maleic anhydride and 10-15% of acetic acid in parts by weight.
5. The method for co-processing organic nitrogen compound with cement kiln as claimed in claim 3, wherein: the inert atmosphere is a mixed gas of carbon dioxide and nitrogen in a volume ratio of 1: 2-5.
6. The method for co-processing organic nitrogen compound with cement kiln as claimed in claim 3, wherein: the activating atmosphere is mixed gas with the volume ratio of hydrogen to nitrogen being 1: 8-12.
7. The method for co-processing organic nitrogen compound with cement kiln as claimed in claim 2, wherein: the acid solution is hydrochloric acid solution, nitric acid solution or sulfuric acid solution.
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