CN111167405B - Adsorbing material based on construction waste and preparation method and application thereof - Google Patents
Adsorbing material based on construction waste and preparation method and application thereof Download PDFInfo
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- CN111167405B CN111167405B CN202010004265.4A CN202010004265A CN111167405B CN 111167405 B CN111167405 B CN 111167405B CN 202010004265 A CN202010004265 A CN 202010004265A CN 111167405 B CN111167405 B CN 111167405B
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28016—Particle form
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4875—Sorbents characterised by the starting material used for their preparation the starting material being a waste, residue or of undefined composition
- B01J2220/4887—Residues, wastes, e.g. garbage, municipal or industrial sludges, compost, animal manure; fly-ashes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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Abstract
The invention provides a preparation method of an adsorbing material based on construction waste, which comprises the following steps: crushing the construction waste to obtain fine powder of the construction waste; heating the fine powder of the construction waste, preserving the heat for a period of time and cooling to form modified fine powder of the construction waste; mixing water and the modified construction waste fine powder to prepare modified construction waste particles; the method not only effectively treats and utilizes the construction waste and reduces the pollution of the construction waste, but also utilizes the adsorption characteristic of the construction waste and further enhances the adsorption capacity of the construction waste through modification, can well remove various heavy metals and other pollutants in the groundwater, and has good practicability.
Description
Technical Field
The invention relates to the technical field of polluted underground water remediation, in particular to an adsorption material based on construction waste and a preparation method and application thereof.
Background
Along with the gradual acceleration of the urbanization process, the yield of the construction waste in China also increases year by year, 10 hundred million tons of construction waste are generated in 2013, and how to effectively treat and utilize the construction waste becomes an important research direction for recycling the solid waste. Meanwhile, the situation of groundwater pollution in China is very severe, and only according to the results of groundwater pollution investigation and evaluation in the North China plain, the comprehensive quality of groundwater is poor as a whole, and the V-type groundwater which can be used after special treatment accounts for 56.55%. Heavy metals such as arsenic and lead in the underground water have high detection rate, and in addition, the heavy metals, organic matters and the like in the polluted soil are easy to leach or permeate into the underground water, so that the serious pollution of the underground water is caused. At present, the groundwater pollution remediation technology is mainly divided into in-situ remediation and ex-situ remediation, and the remediation method mainly comprises aeration remediation, electrokinetic chemical remediation, biological remediation, chemical oxidation remediation, PRB permeable reactive barrier technology and the like, but most of the technologies are complex in operation, high in cost and single in pollutant treatment, so that a new groundwater remediation method gradually becomes a research hotspot. The reuse of construction waste in the existing patents is mostly concentrated on the aspect of construction materials, and the potential of the adsorption materials determined by the porous characteristics of the construction materials is neglected.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an adsorbing material based on construction waste, a preparation method and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a preparation method of an adsorbing material based on construction waste, which comprises the following steps:
crushing the construction waste to obtain fine powder of the construction waste;
heating the fine powder of the construction waste, preserving the heat for a period of time and cooling to form modified fine powder of the construction waste;
mixing water and the modified construction waste fine powder to prepare modified construction waste particles;
carbonizing the modified construction waste particles to form the adsorption material.
Optionally, the crushing of the construction waste to obtain the construction waste fine powder specifically comprises:
removing impurities in the construction waste to obtain concrete construction waste;
drying the concrete construction waste;
crushing the concrete construction waste until the particle size of the concrete construction waste is not more than 5 mm;
grinding concrete construction waste;
screening the concrete construction waste by using a 200-mesh sieve to obtain fine powder of the construction waste.
Optionally, heating the construction waste fine powder, preserving heat for a period of time and cooling to form modified construction waste fine powder specifically comprises:
heating the construction waste fine powder to 350-400 ℃ at a heating rate of 10 ℃/min;
preserving the heat of the fine powder of the construction waste for 30-60 min;
cooling to form modified construction waste fine powder.
Optionally, the water-cement ratio of the mixture of water and the modified construction waste fine powder is 0.3-0.4: 1.
Optionally, the manufacturing of the modified construction waste particles specifically comprises:
uniformly stirring slurry obtained by mixing water and the modified building waste fine powder;
and pouring the slurry into a disc granulator to form spherical modified building waste particles with the diameter of 10-15 mm.
Optionally, the carbonized modified construction waste particles specifically include:
placing the modified building waste particles into a curing box for curing;
taking out the modified construction waste particles from the curing box and putting the modified construction waste particles into a carbonization box for carbonization.
Optionally, the temperature in the curing box is 18-22 ℃, and the relative humidity is 93-97%.
Optionally, the relative humidity in the carbonization chamber is 50% -80%, the temperature is 20-40 ℃, the purity of carbon dioxide is more than 99.5%, and the gas pressure is 0.1 bar.
The invention also provides the adsorbing material prepared by the preparation method of the adsorbing material based on the construction waste.
The invention also provides application of the adsorption material, and the adsorption material is used as a filling material in a polluted underground water remediation process.
The invention provides an adsorption material based on construction waste and a preparation method and application thereof, the modified construction waste fine powder is obtained by heating and modifying broken construction waste, and meanwhile, the modified construction waste fine powder is granulated by adding water and carbonized to obtain modified construction waste particles to form the adsorption material, so that the construction waste is effectively treated and utilized, the pollution of the construction waste is reduced, the adsorption characteristic of the construction waste is utilized, in the modification process, the adsorption capacity of the construction waste is enhanced, various heavy metals and other impurities in underground water can be well removed, and the adsorption material has good practicability.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a process flow diagram of a method of making a construction waste based adsorbent material of the present invention;
FIG. 2 is a schematic diagram of a permeable reactive wall structure using the adsorbent material of the present invention;
FIG. 3 is a schematic view showing the structure of a reaction column for ex-situ remediation of groundwater in which the adsorbent according to the present invention is used.
Detailed Description
In order to better understand the technical solutions, the technical solutions of the present application are described in detail with specific embodiments below, and it should be understood that the specific features in the embodiments and examples of the present application are detailed descriptions of the technical solutions of the present application, but not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict. It should be understood that the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
Example one
Fig. 1 is a flow chart of a method for preparing an adsorbing material based on construction waste according to the present invention, and as shown in fig. 1, the present embodiment provides a method for preparing an adsorbing material based on construction waste, comprising the following steps:
s01, crushing the construction waste to obtain fine powder of the construction waste.
The construction waste is generally composed of dregs, broken stones, waste mortar, broken bricks and tiles, concrete blocks, asphalt blocks, waste plastics, waste metal materials, waste bamboo and wood, and the like, and generally, the construction waste has a great influence on the environment, so that the resource utilization of the construction waste is also a problem to be solved.
In this embodiment, the steps of crushing the construction waste to obtain the fine powder of the construction waste are as follows:
s011, removing impurities in the construction waste to obtain concrete construction waste;
in step S011 of this embodiment, most of the impurities in the construction waste are large granular solids, and the impurities have no adsorbability, so the impurities without adsorbability need to be removed, leaving concrete with adsorbability, that is, the construction waste after the impurities are removed is mainly concrete.
S012, drying the concrete construction waste;
in step S012 of this embodiment, if the concrete construction waste contains moisture, the subsequent modification and grinding will be adversely affected, and therefore, the moisture in the concrete construction waste needs to be dried, so as to facilitate the breaking of the concrete construction waste.
S013, crushing the concrete construction waste until the particle size of the concrete construction waste is not more than 5 mm;
in step S013 of this example, the obtained concrete construction waste was put into a crusher, and the concrete construction waste was crushed into small particles having a diameter of not more than 5mm by the crusher, thereby facilitating the subsequent grinding work.
S014, grinding concrete construction waste;
in step S014 of this example, the concrete construction waste is small particles having a particle size of less than 5mm, and further grinding is only required to obtain fine powder of construction waste, and the small particles are also conveniently ground, so that the gaps between the smaller fine powders can be used for adsorbing impurities when the fine powder is formed.
And S015, screening the concrete construction waste by using a 200-mesh sieve to obtain construction waste fine powder.
In step S015 of this embodiment, the 200-mesh sieve may be used to sieve out the fine powder of the construction waste meeting the requirement, of course, the particle size of the fine powder is selected according to the actual requirement, in this embodiment, it is 200-mesh, and the fine powder with different sizes such as 100-mesh, 150-mesh or 300-mesh may be selected according to the actual requirement.
S02, heating the construction waste fine powder, preserving heat for a period of time and cooling to form modified construction waste fine powder;
in step S02 of this embodiment, the construction waste fine powder is modified by temperature, which is obtained by heating the construction waste fine powder at a heating rate of 10 ℃/min to 350-400 ℃, maintaining the temperature at the ambient temperature for 30-60 min, taking out the construction waste fine powder from the environment, and naturally cooling the construction waste fine powder to form modified construction waste fine powder, wherein the high temperature allows the construction waste fine powder to have self-gelling property by removing free water and crystal water, and also can destroy part of the C-S-H gel structure to enhance the Ca content of the construction waste fine powder2+And other ion exchange capacity.
S03, mixing water and the modified construction waste fine powder to manufacture modified construction waste particles;
in step S03 of this embodiment, in order to facilitate the adsorption of the modified construction waste fine powder on the impurities in the groundwater, the modified construction waste fine powder needs to be mixed to form larger modified construction waste particles, so that the modified construction waste particles have a certain mechanical strength, and the material is prevented from being disintegrated during the adsorption, specifically, water and the modified construction waste fine powder are mixed, the water-cement ratio of the water and the modified construction waste fine powder is 0.3-0.4: 1, during the mixing process, the stirring is continuously performed to make the slurry formed after the mixing uniform, and after the uniform mixing, the slurry is poured into a disk granulator, so as to form spherical modified construction waste particles with a diameter of 10 mm-15 mm.
S04, carbonizing the modified construction waste particles to form the adsorbing material.
In step S04 of this embodiment, after obtaining the spherical modified construction waste particles, the spherical modified construction waste particles need to be carbonized to further improve the adsorption capacity, specifically, the modified construction waste particles are placed in a curing box and cured for a period of time, the curing time can be set according to actual needs, for example, 1 day, 3 days, or 5 days, the temperature in the curing box is 18 to 22 ℃, the relative humidity is 93 to 97%, then the modified construction waste particles are taken out from the curing box and placed in a carbonization box for carbonization, the carbonization time can also be set according to actual needs, for example, 1 day, 3 days, or 5 days, the relative humidity in the carbonization box is 50 to 80%, the temperature is 20 to 40 ℃, the carbon dioxide purity is greater than 99.5%, and the gas pressure is 0.1bar, and finally the adsorption material can be obtained. CO acidic in this step2The gas fully reacts with water in capillary pores of the material through diffusion, and Ca (OH) in the pores is consumed2And C-S-H gel, etc., and further increases the pore structure and the specific surface area of the material. The pH value of the carbonized material is between 8.5 and 9, the surface of the carbonized material is alkaline, and more adsorption sites are easy to generate surface precipitation and ion exchange reaction with heavy metal ions in a water body, and the abundant pore structures in the carbonized material are beneficial to adsorbing organic pollutants with different molecular sizes.
The present embodiment further provides an adsorbing material obtained by the method for preparing the adsorbing material based on construction waste, which may have multiple uses, specifically, fig. 2 is a schematic structural diagram of the adsorbing material of the present invention used in a permeable reactive barrier, as shown in fig. 2, the present embodiment further provides an application of the adsorbing material, that is, the adsorbing material is used as a filling material in a permeable reactive barrier technology, and is specifically operated to evaluate a pollution source range and excavate a permeable reactive barrier installation area, perform barrier and seepage prevention on a low permeability coefficient material filled at the bottom and around, determine an adsorbing material filling amount according to a pollution plume type, a flow rate, a diffusion model and the like, mix the adsorbing material with river sand and wrap and fill the high porosity geotextile into a wall body of the permeable reactive barrier, pile broken stones around, perform upper soil backfilling after installation, the filler material is monitored and replaced periodically.
Fig. 3 is a schematic structural diagram of the adsorbing material of the present invention used in a reaction column for ex-situ remediation of groundwater, and as shown in fig. 3, the present embodiment further provides an application of the adsorbing material, i.e., ex-situ remediation of contaminated groundwater, the adsorbing material is filled into a reaction column made of organic glass, the column is vertically blocked by permeable stones, contaminated groundwater is pumped into the reaction column from the lower part by a sewage pump, the retention time of the contaminated groundwater in the reaction column is calculated according to the type, concentration and expected effect of contaminants, the flow rate is controlled accordingly, and the ineffective adsorbing material is periodically discharged from a discharge port and filled with active adsorbing material from a filling port.
The invention utilizes the characteristics of complex pore structure and strong adsorption capacity of the construction waste to carry out thermal modification and carbonization modification on the construction waste far lower than the firing temperature of cement clinker to manufacture an alkaline porous material based on the construction waste, and the material is used for repairing underground water pollution. Wherein the thermal modification makes the free water and the crystal water removed from the gel have self-gelling property, and the high temperature can also destroy part of C-S-H gel structure to strengthen Ca of the gel2+And the material has certain mechanical strength by adding water for mixing, granulating and maintaining, thereby avoiding the material from being disintegrated during adsorption. Then the material is put into a carbonization box for deep carbonization,CO acidic in this step2The gas fully reacts with water in capillary pores of the material through diffusion, and Ca (OH) in the pores is consumed2And C-S-H gel, etc., and further increases the pore structure and the specific surface area of the material. The pH value of the carbonized material is between 8.5 and 9, the surface of the carbonized material is alkaline, and more adsorption sites are easy to generate surface precipitation and ion exchange reaction with heavy metal ions in a water body, and the abundant pore structures in the carbonized material are beneficial to adsorbing organic pollutants with different molecular sizes. The method is simple to operate, low in cost, wide in raw materials, capable of effectively repairing polluted underground water and simultaneously recycling construction waste, capable of reducing greenhouse gas emission and capable of meeting the environment-friendly concept.
Example two
In this embodiment, a method for preparing an adsorbing material based on construction waste is specifically provided, which includes the following steps:
s01, crushing the construction waste to obtain fine powder of the construction waste.
In this embodiment, the steps of crushing the construction waste to obtain the fine powder of the construction waste are as follows:
s011, removing impurities in the construction waste to obtain concrete construction waste;
in step S011 of this embodiment, 100kg of construction waste is taken, and large impurities such as glass, iron wires, plastics, bricks, etc. are removed to obtain concrete construction waste.
S012, drying the concrete construction waste;
in step S012 of this embodiment, the moisture in the concrete construction waste is dried, and the dried concrete construction waste is obtained.
S013, crushing the concrete construction waste until the particle size of the concrete construction waste is not more than 5 mm;
in step S013 of this example, 80kg of the obtained concrete construction waste was put into a crusher, the concrete construction waste was crushed into small particles by the crusher, and the small particles having a particle size of not more than 5mm were screened out to obtain 80kg of undersize.
S014, grinding concrete construction waste;
in step S014 of this example, the screened small particles having a particle size of less than 5mm were poured into a ball mill and ball milled to further refine the concrete construction waste.
And S015, screening the concrete construction waste by using a 200-mesh sieve to obtain construction waste fine powder.
In step S015 of this example, the fine powder of construction waste meeting the requirement was sieved out with a 200-mesh sieve to obtain 60kg of undersize fine powder.
S02, heating the construction waste fine powder, preserving heat for a period of time and cooling to form modified construction waste fine powder;
in step S02 of this example, the construction waste fine powder was heated to 400 ℃ at a heating rate of 10 ℃/min and maintained at that ambient temperature for 60 min.
S03, mixing water and the modified construction waste fine powder to manufacture modified construction waste particles;
in step S03 of this example, 24kg of water was mixed with 60kg of the modified construction waste fine powder, and during the mixing, the resulting slurry was stirred by a cement paste mixer to make the slurry uniform, and after the uniform mixing, the slurry was poured into a disk pelletizer to produce spherical modified construction waste particles having a diameter of 10mm to 15 mm.
S04, carbonizing the modified construction waste particles to form the adsorbing material.
In step S04 of this embodiment, the modified construction waste particles are placed in a curing box and cured for 3 days, the temperature in the curing box is 20 ℃ and the relative humidity is 97%, and then the modified construction waste particles are taken out of the curing box and placed in a carbonization box for carbonization, the carbonization time is 1 day, the relative humidity in the carbonization box is 65%, the temperature is 22 ℃, the purity of carbon dioxide is greater than 99.5%, and the gas pressure is 0.1bar, and finally the adsorbing material can be obtained.
Mixing 60kg of adsorbing material and river sand, filling the mixture into geotextile, placing the geotextile into a permeable reactive wall, filling gravels with the particle size of about 30mm around the reactive wall, making seepage prevention at the bottom and around the reactive wall, determining the installation position of the permeable reactive wall according to the range and the diffusion trend of chromium pollution plumes on site, backfilling soil on the upper layer after the installation is finished, and periodically monitoring the concentration of chromium in sewage passing through the permeable reactive wall.
EXAMPLE III
In another embodiment of the present invention, unlike the previous embodiment, 5kg of construction waste is taken in step S01 of the present embodiment, and sieved with a 200-mesh sieve to obtain 1kg of undersize powder. In step S02, the heating temperature is 350 ℃, in step S03, 320g of tap water is added and mixed with 1kg of modified construction waste fine powder, in step S04, the modified construction waste particles are taken out of the curing box and put into a carbonization box for carbonization, the relative humidity in the carbonization box is 50%, the temperature is 20 ℃, the purity of carbon dioxide is more than 99.5%, and the gas pressure is 0.1bar, and finally the adsorbing material can be obtained.
500g of adsorbing material is loaded into an organic glass adsorption column, and Pb is pumped by a pump2+And (3) pumping polluted underground water with the concentration of 107.8mg/L into an adsorption column from the lower part, controlling the flow and the flow velocity to ensure that the hydraulic retention time is 2 hours, and collecting the treated sewage at a liquid outlet at the upper end. The Pb in the adsorbed liquid is measured according to HJ700-2014 inductively coupled plasma mass spectrometry for measuring 65 elements in water2+The ion concentration was found to be 9.49 mg/L.
Example four
As another embodiment of the present invention, unlike the previous embodiment, in this embodiment, 500g of the adsorbent is loaded in a plexiglass adsorption column, and the chlorobenzene concentration is pumped to 11.21mg/L, Cu2+The polluted groundwater with the concentration of 136.77mg/L is pumped into an adsorption column from the lower part, the flow and the flow speed are controlled to ensure that the hydraulic retention time is 4.5h, and the treated sewage is collected at a liquid outlet at the upper end. The chlorobenzene concentration in the adsorbed liquid is measured according to HJ621-2011 gas chromatography for measuring chlorobenzene compounds in water quality, and the Cu in the adsorbed liquid is measured according to HJ700-2014 inductively coupled plasma mass spectrometry for measuring 65 elements in water quality2+The ion concentration. The chlorobenzene concentration was found to be 0.53mg/L, Cu2+The ion concentration was 13.62 mg/L.
In summary, the embodiment of the invention provides an adsorbing material based on construction waste and a preparation method and application thereof, because the construction waste is crushed to obtain modified construction waste fine powder, and the modified construction waste fine powder is carbonized to obtain modified construction waste particles to form the adsorbing material, the construction waste is effectively treated and utilized, the pollution of the construction waste is reduced, the adsorption property of the construction waste is utilized, in the modification process, the adsorption capacity of the construction waste is enhanced, various heavy metals and other impurities in underground water can be well removed, and the adsorbing material has good practicability.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
It should be noted that, for those skilled in the art, without departing from the principle of the present application, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present application.
Claims (9)
1. A preparation method of an adsorption material based on construction waste is characterized by comprising the following steps:
crushing the construction waste to obtain fine powder of the construction waste;
heating the construction waste fine powder to 350-400 ℃, preserving the heat for a period of time, and cooling to form modified construction waste fine powder;
mixing water with the modified construction waste fine powder, and manufacturing modified construction waste particles by using a disc granulator;
carbonizing the modified construction waste particles in a carbonization chamber to make acidic CO2The gas fully reacts with water in the pores of the modified construction waste particles through diffusion, and is consumedCa (OH) in the pores2And C-S-H gel, so that the pore structure of the material is increased, the specific surface area is increased, and the adsorbing material is formed; the relative humidity in the carbonization box is 50-80%, the temperature is 20-40 ℃, the carbonization time is more than 1 day, the purity of carbon dioxide is more than 99.5%, and the gas pressure is 0.1 bar.
2. The method of claim 1, wherein the crushing the construction waste to obtain the fine powder of the construction waste specifically comprises:
removing impurities in the construction waste to obtain concrete construction waste;
drying the concrete construction waste;
crushing the concrete construction waste until the particle size of the concrete construction waste is not more than 5 mm;
grinding the concrete construction waste;
and screening the concrete construction waste by using a 200-mesh sieve to obtain the construction waste fine powder.
3. The preparation method of claim 1, wherein the heating of the fine powder of the construction waste to 350-400 ℃, the holding for a period of time and the cooling to form the modified fine powder of the construction waste specifically comprises:
heating the construction waste fine powder to 350-400 ℃ at a heating rate of 10 ℃/min;
preserving the heat of the fine powder of the construction waste for 30-60 min;
cooling to form modified construction waste fine powder.
4. The method according to claim 1, wherein the water-cement ratio of the mixture of water and the modified construction waste fine powder is 0.3-0.4: 1.
5. The method of claim 1, wherein the producing modified construction waste particles with a disc granulator specifically comprises:
uniformly stirring slurry obtained by mixing water and the modified construction waste fine powder;
and pouring the slurry into a disc granulator to form spherical modified building waste particles with the diameter of 10-15 mm.
6. The method of claim 1, wherein carbonizing the modified construction waste particles specifically comprises:
placing the modified building waste particles into a curing box for curing;
and taking the modified construction waste particles out of the curing box and putting the modified construction waste particles into a carbonization box for carbonization.
7. The method according to claim 6, wherein the temperature in the curing box is 18 to 22 ℃ and the relative humidity is 93 to 97%.
8. An adsorbing material obtained by the method for preparing the adsorbing material based on the construction waste according to any one of claims 1 to 7.
9. Use of the adsorbent material according to claim 8 as a packing material in a remediation process of contaminated groundwater.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101058213A (en) * | 2007-06-01 | 2007-10-24 | 济南大学 | Method for preparing building material with carbonization maintenance waste |
| CN101310853A (en) * | 2008-02-15 | 2008-11-26 | 郜洪文 | Calcium adsorbing material and its preparation method |
| CN107324753A (en) * | 2017-04-10 | 2017-11-07 | 南京工业大学 | Carbonate cementing material and preparation method thereof |
| CN107694512A (en) * | 2017-09-22 | 2018-02-16 | 长江师范学院 | A kind of preparation method of removal of heavy metal ions agent |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101058213A (en) * | 2007-06-01 | 2007-10-24 | 济南大学 | Method for preparing building material with carbonization maintenance waste |
| CN101310853A (en) * | 2008-02-15 | 2008-11-26 | 郜洪文 | Calcium adsorbing material and its preparation method |
| CN107324753A (en) * | 2017-04-10 | 2017-11-07 | 南京工业大学 | Carbonate cementing material and preparation method thereof |
| CN107694512A (en) * | 2017-09-22 | 2018-02-16 | 长江师范学院 | A kind of preparation method of removal of heavy metal ions agent |
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