CN111069268A - Method for preparing soil heavy metal passivation material by co-pyrolysis of sludge and attapulgite - Google Patents
Method for preparing soil heavy metal passivation material by co-pyrolysis of sludge and attapulgite Download PDFInfo
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- CN111069268A CN111069268A CN201911397236.2A CN201911397236A CN111069268A CN 111069268 A CN111069268 A CN 111069268A CN 201911397236 A CN201911397236 A CN 201911397236A CN 111069268 A CN111069268 A CN 111069268A
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- attapulgite
- sludge
- heavy metal
- pyrolysis
- passivation material
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- 229960000892 attapulgite Drugs 0.000 title claims abstract description 52
- 229910052625 palygorskite Inorganic materials 0.000 title claims abstract description 52
- 239000010802 sludge Substances 0.000 title claims abstract description 47
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 46
- 239000002689 soil Substances 0.000 title claims abstract description 38
- 238000002161 passivation Methods 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 title claims abstract description 29
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000002245 particle Substances 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 239000012265 solid product Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000008187 granular material Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000010298 pulverizing process Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 229910052793 cadmium Inorganic materials 0.000 description 6
- 229910052804 chromium Inorganic materials 0.000 description 5
- 229910052745 lead Inorganic materials 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 5
- 240000008042 Zea mays Species 0.000 description 3
- 235000016383 Zea mays subsp huehuetenangensis Nutrition 0.000 description 3
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 3
- 235000009973 maize Nutrition 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000003900 soil pollution Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 1
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001768 cations Chemical group 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 231100001240 inorganic pollutant Toxicity 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000003802 soil pollutant Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of soil improvement, and particularly relates to a method for preparing a soil heavy metal passivation material by co-pyrolysis of sludge and attapulgite. The heavy metal passivation material comprises 10-35% of Gansu attapulgite and 65-90% of raw municipal sludge. The invention takes municipal sludge as a main body, has large specific surface area, strong adsorbability, passivation property and dispersibility, and has the capabilities of improving soil and passivating heavy metals. The key point of the technical scheme is that the attapulgite and the sludge are subjected to co-pyrolysis to prepare the heavy metal passivation material, and the sludge and attapulgite co-pyrolysis biochar which is the heavy metal passivation material prepared by the method has an obvious effect on the passivation of heavy metals in soil.
Description
Technical Field
The invention belongs to the technical field of soil improvement, and particularly relates to a method for preparing a soil heavy metal passivation material by co-pyrolysis of sludge and attapulgite.
Background
With the rapid growth of industry and agriculture, the problem of heavy metal pollution of soil is more and more serious, and the problem of heavy metal pollution of soil in China is more and more prominent. According to the reports of the State general administration of environmental protection and the national ministry of land resources, the national soil environment condition is totally optimistic, soil pollution in part of regions is serious, the quality of the cultivated land soil environment is great, the soil environment problem of industrial and mining waste land is prominent, the total exceeding standard rate of the national soil is 16.1 percent, inorganic type is taken as the main, and the number of the inorganic pollutant exceeding standard points accounts for 82.8 percent of the total exceeding standard points. The area of a sewage irrigation area in China is about 140 kilohm 2, and the land area polluted by heavy metals such As Cd, As, Cr, Pb, Hg, Cu, Ni, Zn and the like accounts for 64.8 percent of the total polluted area, wherein the polluted area of Hg and Cd is the largest.
Attapulgite is an inorganic mineral material with low cost and easy availability, and is a hydrous layer chain magnesium silicate mineral. The theoretical chemical components are as follows: SiO 2256.96％；(Mg,Al,Fe)O 23.83％；H2And O19.21 percent. The components are often mixed with Al and Fe, and Al2O3Replacing part of MgO. The basic structural unit is 2: the unit layer is composed of 1 layer of type, namely 2 layers of silicon-oxygen tetrahedron and 1 layer of magnesium-oxygen octahedron. Si due to tetrahedron4+Is covered with Al3+Instead of substitution, a remaining negative charge appears. The attapulgite crystal is hair-like or fibrous, is in long column shape or needle shape under electron microscope, is white, gray, light green or light brown, and is fibrous under atomic mechanics microscope; the attapulgite has a plurality of channels inside, and the section of the channels is about 0.38nm multiplied by 0.63 nm. The attapulgite has larger specific surface area and stronger adsorption and passivation capability, and draws more and more attention in the utilization of soil heavy metal passivation, and the sludge and the attapulgite are co-pyrolyzed and used as soil heavy metal passivation materials to better improve the soil.
Disclosure of Invention
The invention aims to provide a method for preparing a soil heavy metal passivation material by co-pyrolysis of sludge and attapulgite, which solves the problem of high cost in serious treatment of soil pollution in the prior art.
The method for preparing the soil heavy metal passivation material by co-pyrolysis of the sludge and the attapulgite comprises the following steps:
1. crushing and grinding: pulverizing attapulgite raw ore into 200 mesh powder.
2. Mixing: mixing the powdery attapulgite with the municipal sludge at a ratio of 1: 1.
3. Drying and crushing: drying and crushing the mixture into particles with the particle size of 1.7 mm;
4. packaging and warehousing: and packaging the final particles into the sludge and attapulgite co-pyrolysis heavy metal passivation material.
The heavy metal passivation material consists of Gansu attapulgite and municipal sludge.
Further, the heavy metal passivation material comprises, by weight, 10% -35% of Gansu attapulgite and 65% -90% of municipal sludge.
The preparation method of the sludge and attapulgite co-pyrolysis comprises the following steps:
(1) crushing, crushing and grinding attapulgite from Banqiaotown of Linze county in Gansu province into 200-mesh powder;
(2) mixing the powdery attapulgite with the municipal sludge at a ratio of 1: 1, and pyrolyzing in a vacuum tube furnace at a heating rate of 25 deg.C/min for 150 min.
(3) Drying the substance obtained in the step (2) to obtain a solid product;
(4) the solid product was prepared into granules having a particle size of 1.7 mm.
The weight ratio of the attapulgite to the municipal sludge is 1:9-7:13, and the content of the municipal sludge is 10% -90%.
The invention has the beneficial effects that: the sludge and attapulgite co-pyrolysis heavy metal passivation material prepared by the preparation method greatly improves the passivation property and the adsorption property of the attapulgite, can passivate organic pollutants and toxic and harmful heavy metals, reduces the biotoxicity and the mobility of soil pollutants, and reduces the bioavailability of the heavy metals. Part of heavy metals in the soil exist in a cation form, the part of heavy metals has large migration, high bioavailability and maximum harm, the pH value of the soil can be improved by applying the attapulgite, the negative charges on the surfaces of soil particles are increased, hydroxide precipitates of the part of heavy metals in the soil are promoted to form, the stability of the heavy metals is facilitated, and the adsorptivity of the attapulgite to the heavy metals is enhanced.
The specific implementation mode is as follows:
the method for preparing the soil heavy metal passivation material by co-pyrolysis of the sludge and the attapulgite comprises the following steps:
(1) crushing and grinding: pulverizing attapulgite raw ore into 200 mesh powder.
(2) Mixing: mixing the powdery attapulgite with the municipal sludge at a ratio of 1: 1.
(3) Drying and crushing: drying and crushing the mixture into particles with the particle size of 1.7 mm;
(4) packaging and warehousing: and packaging the final particles into the sludge and attapulgite co-pyrolysis heavy metal passivation material.
The heavy metal passivation material comprises Gansu attapulgite and municipal sludge; preferably, the heavy metal passivation material consists of attapulgite in Gansu province and municipal sludge.
The heavy metal passivation material comprises, by weight, 10% -35% of Gansu attapulgite and 65% -90% of municipal sludge.
The preparation method of the sludge and attapulgite co-pyrolysis biochar comprises the following steps:
(1) crushing, crushing and grinding attapulgite from Banqiaotown of Linze county in Gansu province into 200-mesh powder;
(2) mixing the powdery attapulgite and the municipal sludge at a ratio of 1: 1, and pyrolyzing the mixture in a vacuum tube furnace at a heating rate of 25 ℃/min for 150 min.
(3) Drying the substance obtained in the step (2) to obtain a solid product;
(4) the solid product was prepared into granules having a particle size of 1.7 mm.
Wherein the weight ratio of the attapulgite to the municipal sludge is 1:9-7: 13. Within a certain range, the passivation effect of the passivation material can be increased along with the increase of the content of the municipal sludge, but if the content of the municipal sludge is too high, the pH value of the soil can be increased, and the normal growth of plants is influenced, and researches show that the quality fraction of the municipal sludge is too high, the effective state content of part of heavy metals can be increased on the contrary, that is, the application amount of the municipal sludge is too large, the soil can be hardened and alkalized, the heavy metals in the soil can be activated, and the content of the municipal sludge is preferably selected to be 10-90%.
Example 1
After the prepared passivator is added into heavy metal contaminated soil according to the addition of 4% and passivated for 30 days, the passivator has an obvious repairing effect on the soil, and the concrete steps are as follows:
1. after the passivation material prepared by co-pyrolysis of the sludge and the attapulgite is added, the pH value of the soil is correspondingly increased, and researches show that when the pH value of the soil is increased by one unit, the activity of heavy metal in the polluted soil is obviously reduced, the absorption of the heavy metal by crops is reduced, and the heavy metal can be inhibited from migrating to the overground part of the plants.
2. After the passivating material prepared by co-pyrolysis of sludge and attapulgite is added, the biological effectiveness and ecological risk of soil heavy metals are obviously reduced, and the effective states of Cd, Ni, Cr and Pb (0.005mol/L DTPA) are respectively reduced by 1%, 2.2%, 0.89% and 1.8% under the treatment of adding the passivating agent; the occurrence form of heavy metal is greatly changed, and the exchange states of Cd, Ni, Cr and Pb are respectively reduced by 9.9%, 8.7%, 9.5% and 10.5%; the Cd, Ni, Cr and Pb in the residue state are respectively increased by 7.1 percent, 5.3 percent, 6.8 percent and 8.2 percent;
3. after the maize is planted in the passivated soil, the biomass of the maize is increased compared with that of a control, and the content of Cd, Ni, Cr and Pb in the overground part of the maize is reduced by adding the passivator.
Claims (4)
1. The method for preparing the soil heavy metal passivation material by co-pyrolysis of the sludge and the attapulgite comprises the following steps:
(1) crushing and grinding: pulverizing attapulgite raw ore into 200 mesh powder.
(2) And mixing: mixing the powdery attapulgite with the municipal sludge at a ratio of 1: 1.
(3) Drying and crushing: drying and crushing the mixture into particles with the particle size of 1.7 mm;
(4) and packaging and warehousing: and packaging the final particles into the sludge and attapulgite co-pyrolysis heavy metal passivation material.
2. The method for preparing the soil heavy metal passivation material by co-pyrolysis of the sludge and the attapulgite according to claim 1, characterized in that: the heavy metal passivation material comprises, by weight, 10% -35% of Gansu attapulgite and 65% -90% of municipal sludge.
3. The method for preparing the soil heavy metal passivation material by co-pyrolysis of the sludge and the attapulgite according to claim 1, characterized in that: the preparation method of the sludge and attapulgite co-pyrolysis comprises the following steps:
(1) crushing, crushing and grinding attapulgite from Banqiaotown of Linze county in Gansu province into 200-mesh powder;
(2) mixing the powdery attapulgite and the municipal sludge at a ratio of 1: 1, and pyrolyzing the mixture in a vacuum tube furnace at a heating rate of 25 ℃/min for 150 min.
(3) Drying the substance obtained in the step (2) to obtain a solid product;
(4) the solid product was prepared into granules having a particle size of 1.7 mm.
4. The method for preparing the soil heavy metal passivation material by co-pyrolysis of the sludge and the attapulgite according to claim 1, characterized in that: the weight ratio of the attapulgite to the municipal sludge is 1:9-7:13, and the content of the municipal sludge is 10% -90%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911397236.2A CN111069268A (en) | 2019-12-30 | 2019-12-30 | Method for preparing soil heavy metal passivation material by co-pyrolysis of sludge and attapulgite |
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| CN201911397236.2A CN111069268A (en) | 2019-12-30 | 2019-12-30 | Method for preparing soil heavy metal passivation material by co-pyrolysis of sludge and attapulgite |
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| CN201911397236.2A Pending CN111069268A (en) | 2019-12-30 | 2019-12-30 | Method for preparing soil heavy metal passivation material by co-pyrolysis of sludge and attapulgite |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118389157A (en) * | 2024-06-28 | 2024-07-26 | 常熟理工学院 | Method for preparing heavy metal contaminated soil restoration agent by utilizing red mud and product thereof |
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| WO2019008195A1 (en) * | 2017-07-06 | 2019-01-10 | Agrozono, S.L. | Method for disinfecting soils or other agricultural growing media |
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2019
- 2019-12-30 CN CN201911397236.2A patent/CN111069268A/en active Pending
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20200428 |
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