CN111848124A - Method for co-treating heavily polluted soil by waste activated carbon and preparing ceramsite - Google Patents
Method for co-treating heavily polluted soil by waste activated carbon and preparing ceramsite Download PDFInfo
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- CN111848124A CN111848124A CN202010686888.4A CN202010686888A CN111848124A CN 111848124 A CN111848124 A CN 111848124A CN 202010686888 A CN202010686888 A CN 202010686888A CN 111848124 A CN111848124 A CN 111848124A
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- C04B33/132—Waste materials; Refuse; Residues
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
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Abstract
The invention discloses a method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon, belonging to the technical field of soil pollution treatment. Adding waste activated carbon into polluted soil excavated from a polluted site, stirring and mixing the waste activated carbon and the polluted soil, and granulating the mixture into balls; calcining the dried particles, swelling, and naturally cooling to obtain the light ceramsite. The method is mainly used for treating the soil in the industrial heavy metal pollution site and the heavy metal and organic matter composite pollution site, and meanwhile, the addition of the waste activated carbon not only provides a pore-forming agent for the ceramsite preparation process, but also realizes the resource utilization of the waste activated carbon. The method has the advantages of small environmental pollution, simple process flow, economy and high efficiency, and realizes the resource utilization of solid wastes, and the ceramsite prepared by the method has a special structure with porosity, light weight and high surface strength, and can be used as a soilless foundation bed material, a water filtering material and the like for landscaping.
Description
Technical Field
The invention belongs to the technical field of polluted soil treatment and resource utilization, and particularly relates to a method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon; the invention also relates to a method for harmlessly recycling and treating the waste activated carbon and the heavily polluted soil.
Background
The soil pollution condition of China is not optimistic on the whole, the soil environment quality of cultivated land is worried about, the point location standard exceeding rate of the cultivated land soil is 19.4 percent, wherein the severe, moderate, mild and slight point locations exceed the standardThe nominal proportions are 1.1%, 1.8%, 2.8% and 13.7%, respectively. From published data, the cultivated land area polluted by Pb, Hg and other heavy metals in China is 2000 kilohm2And occupies about one fifth of the total cultivated land area.
The treatment of soil pollution can be roughly divided into two modes of removal and solidification. The ceramsite is an effective method which is economical, efficient and recyclable aiming at the heavily polluted soil, and the ceramsite is prepared at high temperature by mainly utilizing the physical and chemical properties of the soil and solidifying and hardening all raw materials together through hydration products.
There are some patented methods for preparing ceramsite by using contaminated soil. For example, patents CN 102173850B and CN 107663099A both describe in detail the steps of a method for preparing haydite from contaminated soil. In addition, other raw materials such as graphite and carbon powder are additionally added in the methods of the patents CN 107353034A and CN 106938895B as foaming agents to prepare the porous light-weight ceramsite material. However, the additional addition of graphite and carbon powder inevitably leads to an increase in production cost.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, provides a method for co-treating heavily polluted soil and preparing ceramsite by using waste activated carbon, which has a good treatment effect and is more economical, has the advantages of small environmental pollution and simple process flow, and realizes the purposes of low cost and resource utilization of waste.
The invention aims to solve another technical problem of providing a method for harmlessly recycling and treating waste activated carbon and heavily polluted soil.
In order to realize the purpose of the invention, the invention provides the following technical scheme:
the invention relates to a method for preparing ceramsite by cooperatively treating heavily polluted soil with waste activated carbon, which is characterized by comprising the following specific steps of:
(1) adding waste activated carbon with the mass fraction of 0.3-8% into the polluted soil excavated from the polluted site, and stirring and mixing;
(2) placing the fully stirred mixture into a granulation machine, and granulating into balls by an extrusion dry method, wherein the granulation particle size is 2-30 mm; drying the particles at the temperature of 80-200 ℃ for 0.5-8 h;
(3) placing the dried particles in a roasting furnace for roasting and swelling at the temperature of 1000-1200 ℃, wherein the time for roasting and swelling is 10-60 min; taking out, and naturally cooling the light ceramsite.
The invention relates to a method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon, which further adopts the preferable technical scheme that: and (3) recycling the tail gas and heat generated in the calcining process for drying the particles in the step (2), and discharging the recycled tail gas after desulfurization and denitrification by a tail gas treatment system to reach the standard.
The invention relates to a method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon, which further adopts the preferable technical scheme that: the polluted soil is site soil polluted by heavy metal or by heavy metal and organic pollutants near industrial and mining enterprises or mining areas.
The invention relates to a method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon, which further adopts the preferable technical scheme that: : the waste activated carbon is a solid mixture containing activated carbon components generated in the processes of industrial wastewater treatment and industrial waste gas treatment.
The invention relates to a method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon, which further adopts the preferable technical scheme that: in the step (1), the mass fraction of the waste activated carbon added into the polluted soil is 4-6%.
The invention relates to a method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon, which further adopts the preferable technical scheme that: in the step (1), the mass fraction of the waste activated carbon added into the polluted soil is 5%.
The invention relates to a method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon, which further adopts the preferable technical scheme that: in the step (2), the grain size of the granules is 10 mm; the drying temperature is 105 ℃, and the drying time is 4 h.
The invention relates to a method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon, which further adopts the preferable technical scheme that: in the step (3), the calcining temperature is 1100 ℃, and the calcining swelling time is 30 min.
The invention also provides a synergic harmless recycling method of the waste activated carbon and the heavily polluted soil, which is characterized in that the method simultaneously treats the waste activated carbon and the heavily polluted soil and produces light ceramsite as a byproduct, and comprises the following specific steps:
(1) adding waste activated carbon with the mass fraction of 0.3-8% into the polluted soil excavated from the polluted site, and stirring and mixing;
(2) placing the fully stirred mixture into a granulation machine, and granulating into balls by an extrusion dry method, wherein the granulation particle size is 2-30 mm; drying the particles at the temperature of 80-200 ℃ for 0.5-8 h;
(3) placing the dried particles in a roasting furnace for roasting and swelling at the temperature of 1000-1200 ℃, wherein the time for roasting and swelling is 10-60 min; taking out, naturally cooling to obtain the light ceramsite, and realizing harmless treatment.
The waste activated carbon and heavily polluted soil collaborative harmless recycling method further preferably adopts the technical scheme that: recycling tail gas and heat generated in the calcining process for drying the particles in the step (2), and discharging the recycled tail gas after desulfurization and denitrification by a tail gas treatment system to reach the standard;
the polluted soil is site soil polluted by heavy metal or by heavy metal and organic pollutants near industrial and mining enterprises or mining areas;
the waste activated carbon is a solid mixture containing activated carbon components generated in the processes of industrial wastewater treatment and industrial waste gas treatment.
The method is mainly used for treating the soil of the industrial heavy metal pollution site and the heavy metal and organic matter composite pollution site, the components of inorganic minerals such as Si, Ca, Fe, Mg and the like in the polluted soil are used as frame raw materials, the waste activated carbon generated in the industrial process is used as a gas generating and foaming raw material, and the light ceramsite for building production is prepared at high temperature.
Compared with the prior art, the invention has the following beneficial effects:
the method can realize the cooperative treatment of the heavily polluted soil by the waste activated carbon, prepare the light ceramsite during the treatment, and effectively solve the problem of difficult treatment of the heavily polluted soil in industrial fields and cultivated lands; meanwhile, the production cost of preparing the porous light ceramsite by utilizing the synergistic effect of the waste activated carbon can be effectively reduced, and the problem of treating the waste activated carbon is effectively solved. The invention relates to a resource method for preparing ceramsite by utilizing polluted soil, which can realize high-value utilization of the polluted soil, waste activated carbon and other wastes, has small environmental pollution and simple process flow and accords with the development concept of national energy conservation and emission reduction and green circular economy. The ceramsite prepared by the method has a special structure with porosity, light weight and high surface strength, and can be used as a soilless foundation bed material, a water filtering material and the like for landscaping.
Detailed Description
The technical solutions of the present invention are further described in detail below to enable those skilled in the art to further understand the present invention, but not to limit the rights of the present invention.
Embodiment 1, a method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon:
(1) preparing a mixed sample: taking 10kg of heavy metal chromium contaminated soil from a waste mining area, taking 0.5kg of waste activated carbon from a sugar manufacturing enterprise, and fully stirring and mixing the contaminated soil and the waste activated carbon;
(2) and (3) granulation: putting the fully stirred mixture obtained in the step (1) into a granulation machine, and granulating into balls by an extrusion dry method, wherein the diameter of the granules after granulation is 10 mm;
(3) and (3) drying: drying the granules granulated and formed by the polluted soil and the waste activated carbon in the step (2) at 105 ℃ for 4 h;
(4) and (3) calcining: placing the dried particles in the step (3) in a roasting furnace for roasting and swelling at 1100 ℃, wherein the roasting and swelling time is 30 min;
(5) and (3) cooling: taking the calcined particles in the step (4) out of the roasting furnace, and naturally cooling at room temperature to obtain a light ceramsite product;
(6) calcination heat utilization and tail gas treatment: the heat that produces among the calcination process is used for the drying of granulation granule, and the gas that can not burn gets into tail gas processing system, accomplishes the SOx/NOx control, realizes discharge up to standard.
Embodiment 2, a method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon, comprising the following specific steps:
(1) adding waste activated carbon with the mass fraction of 0.3% into the polluted soil excavated from the polluted site, and stirring and mixing;
(2) placing the fully stirred mixture into a granulation machine, and granulating into balls by an extrusion dry method, wherein the granulation particle size is 2 mm; drying the granules at 80 ℃ for 8 h;
(3) placing the dried particles in a roasting furnace, and calcining and swelling at 1000 ℃ for 60 min; taking out, and naturally cooling to obtain the light ceramsite.
And (3) recycling the tail gas and heat generated in the calcining process for drying the particles in the step (2), and discharging the recycled tail gas after desulfurization and denitrification by a tail gas treatment system to reach the standard.
The polluted soil is site soil polluted by heavy metal or by heavy metal and organic pollutants near industrial and mining enterprises or mining areas.
The waste activated carbon is a solid mixture containing activated carbon components generated in the processes of industrial wastewater treatment and industrial waste gas treatment.
Embodiment 3, a method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon, comprising the following specific steps:
(1) Adding 8% by mass of waste activated carbon into the polluted soil excavated from the polluted site, and stirring and mixing;
(2) placing the fully stirred mixture into a granulation machine, and granulating into balls by an extrusion dry method, wherein the granulation particle size is 30 mm; drying the granules at 200 ℃ for 0.5 h;
(3) placing the dried particles in a roasting furnace, and calcining and swelling at 1200 ℃, wherein the calcining and swelling time is 10 min; taking out, and naturally cooling to obtain the light ceramsite.
And (3) recycling the tail gas and heat generated in the calcining process for drying the particles in the step (2), and discharging the recycled tail gas after desulfurization and denitrification by a tail gas treatment system to reach the standard.
The polluted soil is site soil polluted by heavy metal or by heavy metal and organic pollutants near industrial and mining enterprises or mining areas.
The waste activated carbon is a solid mixture containing activated carbon components generated in the processes of industrial wastewater treatment and industrial waste gas treatment.
Embodiment 4, a method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon, comprising the following specific steps:
(1) adding waste activated carbon with the mass fraction of 0.3-8% into the polluted soil excavated from the polluted site, and stirring and mixing;
(2) Placing the fully stirred mixture into a granulation machine, and granulating into balls by an extrusion dry method, wherein the granulation particle size is 20 mm; drying the granules at 150 ℃ for 3 h;
(3) placing the dried particles in a roasting furnace, and calcining and swelling at 1050 ℃ for 40 min; taking out, and naturally cooling to obtain the light ceramsite.
And (3) recycling the tail gas and heat generated in the calcining process for drying the particles in the step (2), and discharging the recycled tail gas after desulfurization and denitrification by a tail gas treatment system to reach the standard.
The polluted soil is site soil polluted by heavy metal or by heavy metal and organic pollutants near industrial and mining enterprises or mining areas.
The waste activated carbon is a solid mixture containing activated carbon components generated in the processes of industrial wastewater treatment and industrial waste gas treatment.
Embodiment 5, a method for harmlessly recycling waste activated carbon and heavily polluted soil in cooperation with the same, which simultaneously treats the waste activated carbon and the heavily polluted soil and produces light ceramsite as a byproduct, comprises the following steps:
(1) adding waste activated carbon with the mass fraction of 5% into the polluted soil excavated from the polluted site, and stirring and mixing;
(2) Placing the fully stirred mixture into a granulation machine, and granulating into balls by an extrusion dry method, wherein the granulation particle size is 10 mm; drying the granules at 110 ℃ for 4 h;
(3) placing the dried particles in a roasting furnace, and calcining and swelling at 1050 ℃ for 30 min; taking out, naturally cooling to obtain the light ceramsite, and realizing harmless treatment.
Recycling tail gas and heat generated in the calcining process for drying the particles in the step (2), and discharging the recycled tail gas after desulfurization and denitrification by a tail gas treatment system to reach the standard;
the polluted soil is site soil polluted by heavy metal or by heavy metal and organic pollutants near industrial and mining enterprises or mining areas;
the waste activated carbon is a solid mixture containing activated carbon components generated in the processes of industrial wastewater treatment and industrial waste gas treatment.
The ceramsite prepared by the method has a special structure with porosity, light weight and high surface strength, and can be used as a soilless foundation bed material, a water filtering material and the like for landscaping.
Claims (10)
1. A method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon is characterized by comprising the following specific steps:
(1) adding waste activated carbon with the mass fraction of 0.3-8% into the polluted soil excavated from the polluted site, and stirring and mixing;
(2) Placing the fully stirred mixture into a granulation machine, and granulating into balls by an extrusion dry method, wherein the granulation particle size is 2-30 mm; drying the particles at the temperature of 80-200 ℃ for 0.5-8 h;
(3) placing the dried particles in a roasting furnace for roasting and swelling at the temperature of 1000-1200 ℃, wherein the time for roasting and swelling is 10-60 min; taking out, and naturally cooling to obtain the light ceramsite.
2. The method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon as defined in claim 1, wherein the method comprises the following steps: and (3) recycling the tail gas and heat generated in the calcining process for drying the particles in the step (2), and discharging the recycled tail gas after desulfurization and denitrification by a tail gas treatment system to reach the standard.
3. The method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon as defined in claim 1, wherein the method comprises the following steps: the polluted soil is site soil polluted by heavy metal or by heavy metal and organic pollutants near industrial and mining enterprises or mining areas.
4. The method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon as defined in claim 1, wherein the method comprises the following steps: the waste activated carbon is a solid mixture containing activated carbon components generated in the processes of industrial wastewater treatment and industrial waste gas treatment.
5. The method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon as defined in claim 1, wherein the method comprises the following steps: in the step (1), the mass fraction of the waste activated carbon added into the polluted soil is 4-6%.
6. The method for preparing ceramsite by using waste activated carbon to cooperatively treat heavily polluted soil according to claim 5, wherein the method comprises the following steps: in the step (1), the mass fraction of the waste activated carbon added into the polluted soil is 5%.
7. The method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon as defined in claim 1, wherein the method comprises the following steps: in the step (2), the grain size of the granules is 10 mm; the drying temperature is 105 ℃, and the drying time is 4 h.
8. The method for preparing ceramsite by co-processing heavily polluted soil with waste activated carbon as defined in claim 1, wherein the method comprises the following steps: in the step (3), the calcining temperature is 1100 ℃, and the calcining swelling time is 30 min.
9. A method for harmlessly recycling waste activated carbon and heavily polluted soil in a synergic manner is characterized by simultaneously processing the waste activated carbon and the heavily polluted soil and by-producing light ceramsite, and comprises the following specific steps:
(1) adding waste activated carbon with the mass fraction of 0.3-8% into the polluted soil excavated from the polluted site, and stirring and mixing;
(2) Placing the fully stirred mixture into a granulation machine, and granulating into balls by an extrusion dry method, wherein the granulation particle size is 2-30 mm; drying the particles at the temperature of 80-200 ℃ for 0.5-8 h;
(3) placing the dried particles in a roasting furnace for roasting and swelling at the temperature of 1000-1200 ℃, wherein the time for roasting and swelling is 10-60 min; taking out, naturally cooling to obtain the light ceramsite, and realizing harmless treatment.
10. The method for the cooperative harmless recovery and treatment of the waste activated carbon and the heavily polluted soil as claimed in claim 9, wherein the method comprises the following steps: recycling tail gas and heat generated in the calcining process for drying the particles in the step (2), and discharging the recycled tail gas after desulfurization and denitrification by a tail gas treatment system to reach the standard;
the polluted soil is site soil polluted by heavy metal or by heavy metal and organic pollutants near industrial and mining enterprises or mining areas;
the waste activated carbon is a solid mixture containing activated carbon components generated in the processes of industrial wastewater treatment and industrial waste gas treatment.
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Cited By (2)
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| CN116253555A (en) * | 2023-05-11 | 2023-06-13 | 天津杰臻环保技术有限公司 | Industrial sludge-based full-solid waste water permeable brick and preparation method thereof |
| CN116639952A (en) * | 2023-05-22 | 2023-08-25 | 武汉中科先进材料科技有限公司 | Method for preparing porous ceramic by using polluted soil |
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| CN108658620A (en) * | 2018-05-25 | 2018-10-16 | 南京新循环保科技有限公司 | The method for preparing porous material with solid waste |
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| CN116253555B (en) * | 2023-05-11 | 2023-07-07 | 天津杰臻环保技术有限公司 | Industrial sludge-based full-solid waste water permeable brick and preparation method thereof |
| CN116639952A (en) * | 2023-05-22 | 2023-08-25 | 武汉中科先进材料科技有限公司 | Method for preparing porous ceramic by using polluted soil |
| CN116639952B (en) * | 2023-05-22 | 2024-08-20 | 武汉中科先进材料科技有限公司 | Method for preparing porous ceramic by using polluted soil |
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