CN114308996A - Waste paint bucket recycling treatment process - Google Patents
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- CN114308996A CN114308996A CN202210021029.2A CN202210021029A CN114308996A CN 114308996 A CN114308996 A CN 114308996A CN 202210021029 A CN202210021029 A CN 202210021029A CN 114308996 A CN114308996 A CN 114308996A
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Abstract
The invention discloses a waste paint bucket recycling treatment process, and belongs to the technical field of environmental protection. It comprises the following steps: (1) a residue pouring unit: pouring the residual paint liquid in the waste paint bucket, and manually cleaning the residual paint slag in the waste paint bucket; (2) a decomposition unit: according to the curing degree of residual paint in the waste paint bucket, if the residual paint is not cured, performing pyrolysis treatment and then performing shredding treatment, and if the residual paint is cured, performing shredding treatment and then performing pyrolysis treatment; (3) a crushing unit: crushing the decomposed waste paint bucket to obtain crushed waste paint bucket slag; (4) a magnetic separation unit: transferring the crushed waste paint bucket slag after crushing treatment to a magnetic separator for magnetic separation treatment, and recovering iron substances; (5) a batting unit: and (4) performing ball hitting treatment on the recovered iron substance to prepare the iron ball. It can effectively improve the comprehensive recycling of the waste paint bucket and reduce the environmental pollution.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a waste paint bucket recycling treatment process.
Background
Along with the rapid development of the economy of China, a large amount of waste paint buckets are generated in the industries of resident life, construction, decoration, furniture and the like. From the management perspective, the collection, transfer and disposal processes of paint buckets are brought into the management scope of hazardous wastes in China. The components of the paint bucket are complex, and the paint bucket has certain corrosivity, inflammability, toxicity and reactivity, so that a targeted harmless disposal process is avoided. The useless enterprise of dealing with of danger can only carry out the high temperature with the paint kettle along with other dangers and burn and handle to lose the value of recycle. A large number of non-standard enterprises and individuals directly smash the briquetting with the paint kettle and sell for small-size steel mill, and the recycling process simple process, backward cause remaining chemical substance in the bucket to be emptyd in a large number, abandon, seriously pollute surrounding soil and water body, threaten ecological environment safety. Therefore, the development of a clean production process for recycling the paint bucket is imperative to realize the recycling and harmless treatment of the paint bucket. The waste paint bucket refers to a waste package after paint is used, and the waste paint bucket contains or is directly stained with original paint, and the substances mainly comprise four parts, namely a film forming substance, a filler (pigment and filler), a solvent, an auxiliary agent and the like. The film-forming substance is also called binder, and is formed by mixing organic high molecular compounds such as natural resin (rosin and lacquer), paint (tung oil, linseed oil, soybean oil, fish oil and the like), synthetic resin and the like through high-temperature reaction, and the film-forming substance is a main body of the paint and determines the performance of a paint film. If no film forming matter exists, the paint film cannot be formed by the pure pigment and the auxiliary materials, and the paint film cannot be attached to the barrel and is not easy to remove. Therefore, the waste paint bucket is cleaned and recycled, and the residual working materials in the bucket are effectively separated from the materials of the bucket.
The waste paint bucket is dangerous waste, means that the used paint is discarded, and the waste paint bucket contains or is directly infected with the paint, so that the environment is seriously polluted, and the treatment of the waste paint bucket is very important. At present, there are two main methods for treating paint buckets:
firstly, cleaning and recycling are carried out, the method uses a large amount of cleaning agent, generates a large amount of waste water, is also dangerous waste, needs to be reprocessed, and is easy to leak and pollute the environment;
secondly, incineration: the method burns the iron drum into iron slag, the residue is very much, and the method wastes recyclable iron resources.
For example, the Chinese patent application number: CN201910272352.5, publication No.: CN110090715A discloses a method for treating waste paint buckets, which comprises the following technical scheme:
"comprises the following steps: a: shredding: the waste paint bucket is fed into the shredder from a feeding port of the shredder, then the shredder is started, and the shredder is stopped until the waste paint bucket is shredded into a strip shape; b: electric furnace carbonization: taking out the strip-shaped paint bucket from the shredder, putting the strip-shaped paint bucket into a hanging bucket, then putting the hanging bucket into an electric furnace, sealing the electric furnace, and turning on the electric furnace for heating by electrifying; c: secondary combustion: when heating, the volatile gas overflows and enters the flue gas incineration chamber at the lower part of the electric furnace along with the pipeline to be combusted again, when the temperature in the electric furnace reaches a certain temperature, the electrification is stopped, and the strip-shaped paint bucket is carbonized by utilizing the heat energy of the paint slag; d: bag dust removal: removing dust from the high-temperature flue gas in the electric furnace by using a bag-type dust remover to obtain dust, closing the electric furnace, naturally cooling the paint bucket after high-temperature carbonization to room temperature, and taking out the hanging bucket from the electric furnace; e: crushing and separating: then, the paint bucket carbonized at high temperature is conveyed into a crusher through a hopper, the crusher is started to crush the paint bucket into small metal clusters with the diameter of 5cm, in the crushing process, coke residues attached to a bucket body can become dust in continuous impact, kneading and rebounding, a bag-type dust collector is used for collecting and storing the dust, then the crusher is closed, and the small metal clusters and a small amount of ferric oxide are discharged from a discharge port at the bottom of the crusher; f: magnetic separation: conveying the small metal clusters and the iron oxide into a magnetic separation conveyor by using a discharging conveyor, starting the magnetic separation conveyor, sucking up the iron material by using a rotating magnetic roller in the magnetic separation conveyor, conveying the iron material to a finished metal material pile, and dropping the rest iron oxide into a container below; g: and (3) transportation: after being treated by a crusher and a magnetic separation conveyor, the scrap steel in the metal material pile is sold to steel plants and casting plants, and the coke and lime residues are sold to cement plants. Optionally, the shredding time in the step A is 30min, and the shredding process is catalyzed by light oxygen and is absorbed by activated carbon to remove odor. Optionally, the fly ash in the step D is mainly zinc oxide and coke powder. Optionally, the inside of the crusher in the step E is divided into an upper coarse crushing layer and a lower fine crushing layer, and the principle is that a main shaft rotating at a high speed drives a crushing hammer head to rotate at a high speed to tear, impact and rub the paint bucket. Optionally, the dust in the step E is mainly coke and lime residues, and the coke and lime residues are collected and captured by a dust remover and then discharged from a lower discharge port for shipment by a ton bag ".
However, the above patents have the following problems: the process is complex, and nitrate substances are not effectively recycled; meanwhile, the carbonization process of the electric furnace damages the full utilization of organic matters.
Disclosure of Invention
1. Problems to be solved
Aiming at the problems in the prior art, the invention provides a waste paint bucket recycling treatment process, which can effectively improve the comprehensive recycling of the waste paint bucket and reduce the environmental pollution.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A waste paint bucket recycling treatment process comprises the following steps:
(1) a residue pouring unit: pouring the residual paint liquid in the waste paint bucket, and manually cleaning the residual paint slag in the waste paint bucket at the same time, wherein the mass percent of the residual paint in the waste paint bucket is controlled to be within 10%;
(2) a decomposition unit: according to the curing degree of the residual paint in the waste paint bucket in the step (1), if the residual paint is not cured, performing pyrolysis treatment and then performing shredding treatment, and if the residual paint is cured, performing shredding treatment and then performing pyrolysis treatment;
(3) a crushing unit: crushing the waste paint bucket decomposed in the step (2) to obtain crushed waste paint bucket slag;
(4) a magnetic separation unit: transferring the crushed waste paint bucket slag subjected to crushing treatment in the step (3) into a magnetic separator for magnetic separation treatment, and recovering iron substances;
(5) a batting unit: and (4) performing ball hitting treatment on the iron substance recovered in the step (4) to prepare iron balls.
In the waste paint bucket recycling treatment process,
the pyrolysis treatment in the step (2) comprises the following steps:
residual paint in a waste oil paint bucket to be treated is indirectly heated by adopting light diesel oil of a thermal cleaning furnace, and a furnace chamber of the thermal cleaning furnace is controlled within the range of 200-450 ℃.
In the waste paint bucket recycling treatment process,
the pyrolysis treatment in the step (2) further comprises the following steps:
and performing innocent treatment on the fly ash and the residues after pyrolysis.
In the waste paint bucket recycling treatment process,
the tearing treatment in the step (2) comprises the following steps:
and putting the waste paint bucket into a shredder, and starting the shredder until the waste paint bucket is shredded into a strip shape.
In the waste paint bucket recycling treatment process,
and (3) enabling waste gas generated by the hot cleaning furnace in the step (2) to enter a combustion chamber, then carrying out high-temperature aerobic incineration, transferring generated secondary waste gas to a flue gas purification device for spray purification, monitoring generated tertiary waste gas by using a flue gas online monitoring system, and carrying out emission treatment on the waste gas meeting the emission requirement.
In the waste paint bucket recycling treatment process,
and (3) enabling waste gas generated by the hot cleaning furnace in the step (2) to enter a combustion chamber, then carrying out high-temperature aerobic incineration to generate pyrolysis flue gas, firstly transferring the pyrolysis flue gas to an SNCR (selective non catalytic reduction) denitration system, then transferring the treated flue gas to a quenching tower, then pressurizing and spraying activated carbon powder to the cooled flue gas, recycling the adsorbed activated carbon powder by using a bag-type dust remover, and transferring fly ash brought by the bag-type dust remover to a wet-method deacidification absorption tower for cyclic treatment.
In the waste paint bucket recycling treatment process,
and a reducing agent urea saturated solution is added into the SNCR denitration system.
In the waste paint bucket recycling treatment process,
and (4) collecting light particles generated in the crushing treatment process in the step (3) by a cloth bag dust removal method.
In the waste paint bucket recycling treatment process,
and a reducing agent ammonia water saturated solution and a sodium bicarbonate saturated solution are also added into the SNCR denitration system, wherein the mass ratio of the ammonia water saturated solution to the sodium bicarbonate saturated solution is 3: 1.
in the waste paint bucket recycling treatment process,
the SNCR denitration system also adds a reinforcing agent,
the reinforcing agent comprises the following raw materials in parts by weight:
10 to 20 portions of polythioether imide,
30-50 parts of methanol.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
the designed recycling treatment process can fully remove the attachments of the waste paint bucket, the whole treatment process system can automatically run without being on duty, the environmental risks of cleaning, burning, disposal and other methods are solved, and the waste treatment efficiency is improved. Meanwhile, the waste gas treatment system can stabilize the treatment of pyrolysis gas and reach the discharge standard GB18484-2020 Standard on hazardous waste incineration pollution control. In addition, realize the reutilization of dangerous waste material, the scrap iron bucket can not be by oxidation to the iron slag, can all retrieve comprehensive utilization, and the energy saving has the feature of environmental protection, improves economic benefits.
Drawings
FIG. 1 is a flow chart of a recycling process of a waste paint bucket according to the present invention;
FIG. 2 is a process flow diagram of a decomposition unit according to the present invention;
FIG. 3 is a product diagram of a waste paint bucket according to the present invention.
Detailed Description
The invention is further described with reference to specific examples.
Example 1
The waste paint bucket recycling treatment process disclosed by the embodiment is as shown in fig. 1, solves the problems of resource waste and environmental pollution of the existing waste paint bucket treatment process, and comprises the following steps:
(1) a residue pouring unit: pouring the residual paint liquid in the waste paint bucket, and manually cleaning the residual paint slag in the waste paint bucket at the same time, wherein the mass percent of the residual paint in the waste paint bucket is controlled to be within 10%;
(2) a decomposition unit: as shown in fig. 2, according to the curing degree of the residual paint in the waste paint bucket in the step (1), if the residual paint is not cured, performing pyrolysis treatment and then performing shredding treatment, and if the residual paint is cured, performing shredding treatment and then performing pyrolysis treatment;
it should be noted that the charging process transferred to the pyrolysis treatment is as follows, a waste paint bucket or an iron bar is loaded on a flat car in two layers, an automatic traction system is started, the flat car is conveyed into a thermal cleaning furnace, a furnace door is closed, and the operating temperature is set; meanwhile, the heat cleaning furnace is provided with an independent heating system and a temperature control system, and the heat cleaning furnace adopted by the application is a conventional heat cleaning furnace, namely an SZ-01C type heat cleaning furnace produced by Suzhou melt source mechanical equipment limited company.
It should be noted that this step is a judgment step, and needs to be selected according to the curing degree of the residual paint.
The pyrolysis treatment in the step (2) comprises the following steps:
the residual paint in the waste paint bucket to be treated is indirectly heated by adopting light diesel oil of a thermal cleaning furnace, a furnace chamber of the thermal cleaning furnace is controlled to be in a range of 200-450 ℃, in the embodiment, the temperature of the furnace chamber of 400 ℃ is selected, the oxygen content is continuously reduced in the period, the waste paint slag on the surface of the waste paint bucket and an organic solvent are gradually cracked at high temperature, macromolecular organic components are cracked into micromolecular combustible gas, and the organic components in smoke gas during direct burning can be greatly reduced;
the pyrolysis treatment in the step (2) further comprises the following steps:
performing harmless treatment on the pyrolyzed fly ash and residues, and entrusting the treated fly ash and residues as hazardous wastes to a qualification unit;
the tearing treatment in the step (2) comprises the following steps:
putting the waste paint bucket into a shredder, and starting the shredder until the waste paint bucket is shredded into a strip shape;
and (3) enabling waste gas generated by the thermal cleaning furnace in the step (2) to enter a combustion chamber, then carrying out high-temperature aerobic incineration, transferring generated secondary waste gas to a flue gas purification device for spray purification, and enabling generated tertiary waste gas to be used as a flue gas online monitoring system (provided with the flue gas online monitoring system for detecting smoke dust and SO in the flue gas discharged by pyrolysis)2、CO、NOxA plurality of parameters such as HCl and flue gas volume, monitoring the concentration of the discharged flue gas pollutants in real time and feeding back to control the operation of the flue gas purification system) for monitoring, and performing discharge treatment on the waste gas meeting the discharge requirement; in the process, when the decomposed product (organic waste gas) enters a combustion system of a combustion chamber, the high-temperature aerobic incineration is carried out by adopting light diesel oil for ignition, the unique T-shaped structural design of the combustion system (the combustion chamber attached to an SZ-01C type thermal cleaning furnace manufactured by Suzhou melt source mechanical equipment Co., Ltd., and other common structures capable of realizing the high-temperature aerobic incineration can be adopted, such as the thermal cleaning furnace mentioned by the invention of CN201410544219.8 China), the waste gas can be fully incinerated for more than 2s, the incineration temperature is controlled to be 850 ℃ -1100 ℃ (1000 ℃ is adopted in the embodiment), and the organic waste gas is converted into CO2Water vapor, acid gases, heavy metals, and the like. It should be noted that the generated secondary exhaust gas may also directly enter the SNCR denitration system for operation, as follows, however, the following SNCR denitration system and subsequent steps are adopted in the present embodiment.
Enabling waste gas generated by the hot cleaning furnace in the step (2) to enter a combustion chamber, then carrying out high-temperature aerobic incineration to generate pyrolysis flue gas, firstly transferring the pyrolysis flue gas to an SNCR (selective non catalytic reduction) denitration system, then transferring the treated flue gas to a quenching tower, then pressurizing and spraying activated carbon powder to the cooled flue gas, recycling the adsorbed activated carbon powder by using a bag-type dust remover, and transferring fly ash brought by the bag-type dust remover to a wet-method deacidification absorption tower for cyclic treatment;
specifically, the SNCR denitration system adopts a conventional device, and is manufactured by environment-friendly science and technology limited in the sky at the top of a building, and meanwhile, for example, the SNCR denitration system with application number of cn201510494130.x is also applicable to the application. For nitrogen oxides in the waste gas, if only reducing agent liquid urea solution is adopted, the prepared urea solution enters a nozzle of a denitration system after being pressurized by a delivery pump, the urea solution is atomized by the nozzle by pressure and sprayed into the denitration system, and urea and NO are mixed in a combustion chamber environmentxReaction to form N2And the designed denitration efficiency of the SNCR is more than or equal to 40%, and the SNCR denitration chemical reaction formula under the use of urea is as follows:
CO(NH2)2+H2O→NH2COONH4→2NH3+CO2
4NO+4NH3+O2→4N2+6H2O
2NO2+4NH3+O2→3N2+6H2O
the SNCR denitration system is added with a reducing agent urea saturated solution; and a reducing agent ammonia water saturated solution and a sodium bicarbonate saturated solution are also added into the SNCR denitration system, wherein the mass ratio of the ammonia water saturated solution to the sodium bicarbonate saturated solution is 3: 1; it should be noted that the urea saturated solution and the ammonia saturated solution are respectively injected, wherein a nozzle of the urea saturated solution is located above a nozzle of the ammonia saturated solution, a nozzle of the sodium bicarbonate saturated solution is located below the nozzle of the ammonia saturated solution, the total injection mass of the urea saturated solution in a unit time is taken as 100, in actual operation, the total injection mass of the urea solution per minute is 2kg, the corresponding total exhaust gas amount in the same time is 10L, the total injection mass of the ammonia saturated solution is 90, and the total injection mass of the sodium bicarbonate saturated solution is 30.
The SNCR denitration system also adds a reinforcing agent,
the reinforcing agent comprises the following raw materials in parts by weight:
15 parts of polythioether imide, namely 15 parts of polythioether imide,
40 parts of methanol;
it should be noted that the parts by weight referred to are based on the reductant liquid urea solution, and it is assumed that the parts by weight of the reductant liquid urea solution is 100 parts.
The information of the quenching tower related to the project of the application is as follows:
the quenching tower is provided with an exchanger and a circulating water tank, the exchanger enables the waste gas and water to indirectly exchange heat, the high-temperature waste gas can be rapidly reduced to be below 200 ℃ within 1s, the requirement of controlling the temperature required by subsequent tail gas treatment is met, and meanwhile, a generation region (200-550 ℃) consisting of dioxin is avoided, so that the generation of the dioxin is inhibited.
The project of the application also relates to an activated carbon spraying and cloth bag dust removing system, wherein activated carbon powder is sprayed into the flue gas after quenching by pressurization, and dioxin and other adsorbable harmful substances are subjected to adsorption treatment. The carbon powder after adsorption is conveyed to a carbon powder collector and a bag-type dust collector under the action of a draught fan. And adsorbing dioxin and a small amount of residual organic tail gas in the flue gas by using the activated carbon. The carbon powder collector can collect most of the activated carbon powder, so that the activated carbon can be recycled. Meanwhile, an airflow distribution system in an air inlet pipe of the bag-type dust collector uniformly distributes airflow to the whole cross section of a filter chamber, and then the airflow is fully filtered by a bag, and the filter chamber is divided into a gas purification chamber and a dust-containing chamber by a pattern plate. When the dusty airflow passes through the cloth bag and enters the air purifying chamber (the process is the filtering process or the dedusting process), an ash layer (a powder distribution layer) is left on the outer surface of the cloth bag, and the collected fly ash dust is entrusted to the harmless disposal of a qualification unit. The bag-type dust remover is an efficient dust removing device, the particle size of removed dust is more than 0.05 mu m, and the designed dust removing efficiency can reach more than 99%. It should be reminded that the activated carbon injection device or the cloth bag dust removal device can be a conventional device on the market.
Wet process deacidification absorption tower in this application projectThe acidic gas in the flue gas is mainly HCl and SO2The flue gas enters from the bottom of the spray tower, passes through the packing layer and the spray layer, and is mixed with NaOH solution sprayed from a spray device (comprising a spray pump, a nozzle and other facilities) in the tower to contact and react in the rising process so as to achieve the purpose of removing acid gas. The wet deacidification system can remove residual particles and heavy metals in the flue gas, the alkali liquor is recycled, and the alkali liquor is replaced periodically when reaching a saturated state. It should be reminded that the tower of the wet deacidification system can be adopted as long as the absorption tower can realize the functions. It should be reminded that the waste gas discharge port of the absorption tower can be provided with a flue gas on-line monitoring system.
It should be noted that the residue generated from the whole decomposition unit, for example, the pyrolysis residue includes two parts of bottom slag and fly ash, and the main sources are high temperature pyrolysis residue and tar, and fly ash collected by a combustion chamber and a bag-type dust collector. After the bottom slag and the solidified fly ash are collected, the fly ash is temporarily stored by depending on the existing raw materials and finished products of an enterprise, and finally, a qualification unit is entrusted to dispose the fly ash.
(3) A crushing unit: crushing the waste paint bucket decomposed in the step (2) to obtain crushed waste paint bucket slag;
collecting light particles generated in the crushing treatment process in the step (3) by a cloth bag dust removal method;
(4) a magnetic separation unit: transferring the crushed waste paint bucket slag subjected to crushing treatment in the step (3) into a magnetic separator for magnetic separation treatment, and recovering iron substances;
(5) a batting unit: and (4) performing ball hitting treatment on the iron substance recovered in the step (4) to prepare iron balls.
For step (3), step (4) and step (5), the operation of the plant is as follows:
the waste iron barrel after pyrolysis is fed into the shredder through an automatic feeder, the fed raw materials are cut into iron strips with the width of 10 centimeters at a time through a rotor with a hob and then crushed by the crusher to form iron balls, the iron balls pass through a magnetic roller, the magnetic roller is installed on a motor of conveying equipment to form a magnetic separator with a conveying belt, when iron-containing substances pass through the magnetic roller, the iron-containing substances are attracted by the magnetic roller to be separated from other impurities, and the iron balls are sold to steel plants for comprehensive utilization.
Example 2
This embodiment is basically the same as embodiment 1 except that:
the reinforcing agent comprises the following raw materials in parts by weight:
10 parts of polythioether imide, namely 10 parts of polythioether imide,
50 parts of methanol.
Example 3
The reinforcing agent comprises the following raw materials in parts by weight:
20 parts of polythioether imide and a preparation method thereof,
30 parts of methanol.
Comparative example 1
This embodiment is basically the same as embodiment 1 except that:
the reinforcing agent comprises the following raw materials in parts by weight:
15 parts of polythioetherimide.
Comparative example 2
This embodiment is basically the same as embodiment 1 except that:
the reinforcing agent comprises the following raw materials in parts by weight:
40 parts of methanol.
Comparative example 3
This embodiment is basically the same as embodiment 1 except that:
no reinforcing agent was added.
Comparative example 4
This embodiment is basically the same as embodiment 1 except that:
and a reducing agent ammonia water saturated solution and a sodium bicarbonate saturated solution are also added into the SNCR denitration system, wherein the mass ratio of the ammonia water saturated solution to the sodium bicarbonate saturated solution is 1: 1.
comparative example 5
This embodiment is basically the same as embodiment 1 except that:
and a reducing agent ammonia water saturated solution is also added into the SNCR denitration system.
Comparative example 6
This embodiment is basically the same as embodiment 1 except that:
and a saturated solution of sodium bicarbonate is also added into the SNCR denitration system.
Example 4
Taking the waste paint bucket of the latex paint 'full effect of formaldehyde resistance' of Nippon as an example, as shown in FIG. 3, a corresponding effect test is performed.
It should be reminded that the old years of the waste paint bucket exceed three years, and the production date is within the period of 2014-2015.
For better and intuitive description, the experimental effect of the pyrolysis treatment in the step (2) is specifically that after the SNCR denitration system is detected, firstly, the NO in the waste gas is measured before the waste gas enters the SNCR denitration systemxHas an average content of 3500mg/m3NO in the exhaust gas after being treated by SNCR denitration systemxThe average content of (A) is as follows:
example 1: 176mg/m3；
Example 2: 185mg/m3；
Example 3: 181mg/m3；
Comparative example 1: 452mg/m3；
Comparative example 2: 329mg/m3；
Comparative example 3: 1034mg/m3；
Comparative example 4: 297mg/m3；
Comparative example 5: 260mg/m3；
Comparative example 6: 274mg/m3；
Therefore, compared with the traditional SNCR denitration system which only adopts urea solution as a reducing agent, the denitration system has a more efficient denitration effect. In particular, comparative example 3 in which no enhancer was added, and comparative examples 1 and 2 in which one component of the enhancer was removed, respectively, were incorporated herein mainly in consideration of the general denitrification effect of urea solutions, and the fact that urea is easily crystallized and is not conveniently storedIn the process of industrial operation, the urea solution needs to be used repeatedly, impurities in other waste gases can be absorbed together sometimes, the absorption effect of the urea solution is seriously reduced, thioether bonds in polythioetherimide can be compounded with nitric acid groups, the thermal stability is good, and NO in the waste gases can be absorbedxAnd the methanol is fixed in the urea, so that the problem that methanol is low in cost because the methanol is desorbed again after being absorbed by urea solution is avoided, the methanol can absorb other substances in the waste gas, the pollution is small during the combustion of the methanol, the combustion heat value of the waste gas is increased, and the pyrolysis of various harmful substances in the waste gas is enhanced. Comparative example 4 is a setting of mass ratio of ammonia saturated solution to sodium bicarbonate saturated solution, comparative example 5 is only a keeping of ammonia saturated solution, and comparative example 6 is only a keeping of sodium bicarbonate saturated solution, firstly, urea solution and ammonia saturated solution are rarely used in combination, ammonia gas is easily generated by mixing the two solutions, in the application, two liquids are independently sprayed, the problems are avoided, secondly, sodium bicarbonate solution can generate sodium carbonate and release carbon dioxide at high temperature, sodium carbonate can neutralize acidic substances in waste gas, and carbon dioxide can neutralize sprayed urea.
In addition, the cost is accounted for as follows:
taking example 1 as an example, 1000 waste paint buckets are treated every day, the recovery price is about 5 yuan per bucket, the average content of waste paint slag per bucket is 2kg, the energy consumption of the treatment process per bucket is about 11 degrees of electric energy, but the average nitric acid generated by the waste paint slag per bucket is about 0.8kg, and meanwhile, the waste paint buckets can bring about iron recovery, so that the economic value is considerable, and the environmental pollution caused by the waste paint buckets can be effectively relieved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The waste paint bucket recycling treatment process is characterized by comprising the following steps of:
the method comprises the following steps:
(1) a residue pouring unit: pouring the residual paint liquid in the waste paint bucket, and manually cleaning the residual paint slag in the waste paint bucket at the same time, wherein the mass percent of the residual paint in the waste paint bucket is controlled to be within 10%;
(2) a decomposition unit: according to the curing degree of the residual paint in the waste paint bucket in the step (1), if the residual paint is not cured, performing pyrolysis treatment and then performing shredding treatment, and if the residual paint is cured, performing shredding treatment and then performing pyrolysis treatment;
(3) a crushing unit: crushing the waste paint bucket decomposed in the step (2) to obtain crushed waste paint bucket slag;
(4) a magnetic separation unit: transferring the crushed waste paint bucket slag subjected to crushing treatment in the step (3) into a magnetic separator for magnetic separation treatment, and recovering iron substances;
(5) a batting unit: and (4) performing ball hitting treatment on the iron substance recovered in the step (4) to prepare iron balls.
2. The waste paint bucket recycling process of claim 1, wherein:
the pyrolysis treatment in the step (2) comprises the following steps:
residual paint in a waste oil paint bucket to be treated is indirectly heated by adopting light diesel oil of a thermal cleaning furnace, and a furnace chamber of the thermal cleaning furnace is controlled within the range of 200-450 ℃.
3. The waste paint bucket recycling process of claim 2, wherein:
the pyrolysis treatment in the step (2) further comprises the following steps:
and performing innocent treatment on the fly ash and the residues after pyrolysis.
4. The waste paint bucket recycling process of claim 1, wherein:
the tearing treatment in the step (2) comprises the following steps:
and putting the waste paint bucket into a shredder, and starting the shredder until the waste paint bucket is shredded into a strip shape.
5. The waste paint bucket recycling process of claim 2, wherein:
and (3) enabling waste gas generated by the hot cleaning furnace in the step (2) to enter a combustion chamber, then carrying out high-temperature aerobic incineration, transferring generated secondary waste gas to a flue gas purification device for spray purification, monitoring generated tertiary waste gas by using a flue gas online monitoring system, and carrying out emission treatment on the waste gas meeting the emission requirement.
6. The waste paint bucket recycling process of claim 2, wherein:
and (3) enabling waste gas generated by the hot cleaning furnace in the step (2) to enter a combustion chamber, then carrying out high-temperature aerobic incineration to generate pyrolysis flue gas, firstly transferring the pyrolysis flue gas to an SNCR (selective non catalytic reduction) denitration system, then transferring the treated flue gas to a quenching tower, then pressurizing and spraying activated carbon powder to the cooled flue gas, recycling the adsorbed activated carbon powder by using a bag-type dust remover, and transferring fly ash brought by the bag-type dust remover to a wet-method deacidification absorption tower for cyclic treatment.
7. The waste paint bucket recycling process of claim 6, wherein:
and a reducing agent urea saturated solution is added into the SNCR denitration system.
8. The waste paint bucket recycling process of claim 1, wherein:
and (4) collecting light particles generated in the crushing treatment process in the step (3) by a cloth bag dust removal method.
9. The waste paint bucket recycling process of claim 7, wherein:
and a reducing agent ammonia water saturated solution and a sodium bicarbonate saturated solution are also added into the SNCR denitration system, wherein the mass ratio of the ammonia water saturated solution to the sodium bicarbonate saturated solution is 3: 1.
10. the waste paint bucket recycling process of claim 9, wherein:
the SNCR denitration system also adds a reinforcing agent,
the reinforcing agent comprises the following raw materials in parts by weight:
10 to 20 portions of polythioether imide,
30-50 parts of methanol.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210021029.2A CN114308996B (en) | 2022-01-10 | 2022-01-10 | Waste paint bucket recycling treatment process |
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| CN114308996B (en) | 2023-03-14 |
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