CN109852393A - A kind of water-retaining type heavy-metal contaminated soil repairs the preparation method and applications of particle - Google Patents
A kind of water-retaining type heavy-metal contaminated soil repairs the preparation method and applications of particle Download PDFInfo
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- CN109852393A CN109852393A CN201910010122.1A CN201910010122A CN109852393A CN 109852393 A CN109852393 A CN 109852393A CN 201910010122 A CN201910010122 A CN 201910010122A CN 109852393 A CN109852393 A CN 109852393A
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Abstract
The present invention provides a kind of preparation method and applications of water-retaining type heavy-metal contaminated soil reparation particle.The present invention can solve the problems, such as that red mud is common for in-situ immobilization heavy metal soil, i.e., red mud is used to make when heavy-metal contaminated soil in-situ immobilization rising rapidly in short term for soil pH, destroy the risk of soil rationality environment to a certain extent there are lye surplus.And this, which repairs particle, also has certain water suction, water-retaining property, can also store a certain amount of moisture for soil.Experiments prove that this, which is repaired particle, applies existing preferable removal effect in heavy metal soil, and will not have an impact to soil rationality environment and microorganism, animal and plant growth breeding.
Description
Technical field
The present invention relates to heavy metal-polluted soils to repair field, and a kind of water-retaining type heavy-metal contaminated soil repairs the preparation side of particle
Method and its application.
Background technique
Heavy metal pollution of soil is always one of the problem of various circles of society most pay close attention to.In the soil, heavy metal has residual
The features such as time is long, toxicity is big, hiding is strong, and the heavy metal in soil also by food chain and can move to underground water etc.
Mode is transmitted, and directly or indirectly generates significant negative impact to the health even life security of the mankind.Heavy metal
The improvement of contaminated soil is always the focus of numerous home and abroad environment staff and focus of attention, and carries out to this difficult point project
The exploration of effort.
Red mud is to form waste residue after industrial abstract aluminium oxide, its waste resource can be turned to one kind according to the property of red mud
Heavy metal-polluted soil repair materials can reduce damage of the waste red mud residues accumulation to soil, and can heavy metal-passivated contaminated soil.But
A large amount of lye can be discharged after directly red mud is manured into soil in short term, may cause lye surplus, exist influences to a certain extent
The risk of animal and plant growth in soil.
Summary of the invention
The deficiency of heavy-metal contaminated soil in-situ immobilization is used for for red mud, the present invention provides a kind of water-retaining type heavy metals
Contaminated soil remediation particle.The reparation particle be with hydroxy apatite resin be wrapped in calcining formed red mud particle outer layer and
A kind of composite soil formed repairs particle.This composite particles have the core-shell structure of mutually benefit, i.e., outside hydroxy apatite resin
Shell can be sustained the lye that red mud is discharged, and the lye surplus that soil is likely to occur after preventing red mud from applying is caused by soil environment
Risk: on the other hand, the lye that red mud is discharged can provide again for the hydroxyapatite in shell is suitable for removing heavy metals
Alkaline environment increases hydroxyapatite to the removal amount of heavy metal-polluted soil；This repairs particle, and there are also certain water suctions, water conservation
Property, a certain amount of moisture can be stored for soil.Experiments prove that this is repaired existing preferable in particle application heavy metal soil
Passivation effect, and adverse effect is not present to soil rationality environment and microorganism, animal and plant growth breeding.
1. a kind of water-retaining type heavy-metal contaminated soil repairs particle, which is characterized in that including following mass fraction: red mud 35
~ 52 parts, 5 ~ 15 parts of acrylic acid, 5 ~ 12 parts of sodium hydroxide, 15 ~ 32 parts of hydroxyapatite, 4 ~ 5 parts of ammonium persulfate, N, N '-methylene
1 ~ 2 part of bisacrylamide.
2. the preparation method that a kind of water-retaining type heavy-metal contaminated soil repairs particle, which comprises the following steps:
(1) it the preparation of red mud particle: takes 35 ~ 52 parts of red muds to mix with suitable quantity of water, causes spheric granules, particle after sieving by hand
Diameter is maintained at 0.9 ~ 1.3mm, and red mud particle is put into spare after calcining in Muffle furnace；
(2) preparation of hydroxy apatite resin solution: under agitation, 5 ~ 12 parts of sodium hydroxide solutions are added to 5 ~ 15 part third
In olefin(e) acid, it is cooled to room temperature.Then by 15 ~ 32 parts of hydroxyapatites, 4 ~ 5 parts of ammonium persulfates, 1 ~ 2 part of N, N '-di-2-ethylhexylphosphine oxide third
Acrylamide and 10mL distilled water are added sequentially in solution.Finally, flask is put into water-bath in the case where blender stirring
Water-bath is heated slowly to 70 DEG C, and keeps reaction 3h in this temperature；
(3) 35 ~ 52 parts of calcined red mud particles the preparation of composite particles: are immersed in the hydroxy apatite resin of step (2)
10 ~ 20min in solution obtains complex repairation particle after pulling drying out.
Specific embodiment
Embodiment 1
A kind of water-retaining type heavy-metal contaminated soil repairs the preparation method of particle, comprising the following steps:
(1) it the preparation of red mud particle: the preparation of red mud particle: takes 40 parts of red muds to mix with suitable quantity of water, causes ball after sieving by hand
Shape particle, grain diameter are maintained at 1.1 ~ 1.3mm, red mud particle is put into calcined in Muffle furnace after it is spare, the condition of calcining is
Heating rate is 2 DEG C/min, calcines 1h under conditions of temperature is 800 DEG C；
(2) preparation of hydroxy apatite resin solution: under agitation, 8 parts of sodium hydroxide solutions are added to 10 parts of acrylic acid
In, make the degree of neutralization 80% of acrylic acid, is cooled to room temperature.Then by 20 parts of hydroxyapatites, 4 parts of ammonium persulfates, 1 part of N, N '-
Methylene-bisacrylamide and 10mL distilled water are added sequentially in solution.Finally, flask is put in the case where blender stirring
Enter water-bath in water-bath, is heated slowly to 70 DEG C, and keep reaction 3h in this temperature；
(3) 40 parts of calcined red mud particles the preparation of composite particles: are immersed in the hydroxy apatite resin solution of step (2)
Middle 20min, pull out 50 DEG C at a temperature of dry 6h after complex repairation particle.
Implementation result
1. the repairing effect of composite particles
In the dosage and 500g contaminated soil for being 1% with mass ratio by the composite particles prepared in example 1, number R1, simultaneously
Red mud raw material (the R of identical dosage is set2), red mud particle (R3) and contaminated soil (R without renovation agent0), it is added in every group
200mL deionized water, when testing 30 days the parameter of each group and with initial contaminated soil (CK0) parameter compare.
Test result is shown in Table 1
Table 1
It is repaired in the soil after composite particles are repaired 30 days using prepared by example 1, available state Pb content reduces 74.53%,
Available state Cd content reduces 72.41%, has preferable repairing effect compared to red mud raw material and red mud particle；It is prepared by example 1
Reparation composite particles apply 30 days after soil pH rise 17.5%, compared to the pH of red mud raw material and red mud particle rise
It is smaller；The soil organism is smaller compared to red mud raw material and red mud particles effect；Reparation composite particles prepared by example 1 apply 30
After it, soil moisture content is still 35%, about 1.75 times of red mud raw material and red mud particle group soil.
The repairing effect of different composite particle dosage
By the composite particles prepared in example 1 in 0%, 1%, 2%, 3%, 4%, 5% mass ratio and 500g contaminated soil, number is
R0、R1、R2、R3、R4、R5, 200mL deionized water is added in every group, when testing 30 days the parameter of each group and with initial contaminated soil
(CK0) parameter compare.
Test result is shown in Table 2
Table 2
The reparation composite particles prepared using example 1 are with 0%, 1%, 2%, 3%, 4%, 5% quality than repairing 30 days in mixed soil
Afterwards, it finds also to increase with the increase of mass ratio, available state Pb content with available state Cd content reduction amount, available state Pb content
Reduce 74.53%, 76.90%, 79.39%, 82.79%, 85.54 respectively, available state Cd content reduces 72.41% respectively,
77.58%, 79.31%, 82.76%, 86.21%, there is preferable repairing effect；Reparation composite particles prepared by example 1 apply 30
Soil pH after it can rise with the increase of mass ratio, maximum when mass ratio is 5%, pH 8.7；The soil organism with
The increase of mass ratio and reduce, but reduce amplitude it is little；After reparation composite particles prepared by example 1 apply 30 days, soil contains
Water increases with the increase of mass ratio, and maximum when mass ratio is 5%, moisture content is about 37.2%.
Claims (4)
1. a kind of water-retaining type heavy-metal contaminated soil repairs particle, which is characterized in that including following mass fraction: red mud 35 ~ 52
Part, 5 ~ 15 parts of acrylic acid, 5 ~ 12 parts of sodium hydroxide, 15 ~ 32 parts of hydroxyapatite, 4 ~ 5 parts of ammonium persulfate, N, N '-di-2-ethylhexylphosphine oxide
1 ~ 2 part of acrylamide.
2. the preparation method that a kind of water-retaining type heavy-metal contaminated soil repairs particle, which comprises the following steps:
(1) preparation of hydroxy apatite resin solution: under agitation, 5 ~ 12 parts of sodium hydroxide solutions are added to 5 ~ 15 part third
In olefin(e) acid, reaches certain acrylic acid degree of neutralization, be cooled to room temperature, then by 15 ~ 32 hydroxyapatites, 4 ~ 5 parts of ammonium persulfates,
1 ~ 2 part of N, N '-methylene-bisacrylamide and 10mL distilled water are added sequentially in solution, finally, in the feelings of blender stirring
Under condition, flask is put into water-bath in water-bath, is heated slowly to 70 DEG C, and keep reaction 3h in this temperature；
(2) 35 ~ 52 parts of calcined red mud particles the preparation of composite particles: are immersed in the hydroxy apatite resin of step (1)
10 ~ 20min in solution obtains complex repairation particle after pulling drying out.
3. sodium hydroxide is mixed with acrylic acid, makes acrylic acid in the preparation of hydroxy apatite resin solution as claimed in claim 2
Degree of neutralization is 75% ~ 85%.
4. red mud particle impregnates in hydroxy apatite resin solution in the preparation of complex repairation particle as claimed in claim 2
Afterwards in 50 DEG C of at a temperature of dry 6h.
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| CN201910010122.1A CN109852393A (en) | 2019-01-07 | 2019-01-07 | A kind of water-retaining type heavy-metal contaminated soil repairs the preparation method and applications of particle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110423178A (en) * | 2019-08-30 | 2019-11-08 | 杨建强 | A kind of xerosol quality guarantee aqua and the preparation method and application thereof based on changed red mud |
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| CN106734130A (en) * | 2016-12-22 | 2017-05-31 | 胡自田 | A kind of improving salinization soil red mud base modified soil renovation agent and preparation method thereof |
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2019
- 2019-01-07 CN CN201910010122.1A patent/CN109852393A/en active Pending
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| CN102240536A (en) * | 2010-05-12 | 2011-11-16 | 中国科学院生态环境研究中心 | Red mud coated adsorption material for removing inorganic pollutants and preparation method thereof |
| CN103619919A (en) * | 2011-06-29 | 2014-03-05 | 株式会社日本触媒 | Polyacrylic acid (salt) water-absorbent resin powder, and method for producing same |
| CN106318397A (en) * | 2016-03-24 | 2017-01-11 | 福建洋屿环保科技股份有限公司 | Garden soil improver prepared by wrapping red mud and sludge with thin shell and preparation method thereof |
| CN106734130A (en) * | 2016-12-22 | 2017-05-31 | 胡自田 | A kind of improving salinization soil red mud base modified soil renovation agent and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110423178A (en) * | 2019-08-30 | 2019-11-08 | 杨建强 | A kind of xerosol quality guarantee aqua and the preparation method and application thereof based on changed red mud |
| CN110423178B (en) * | 2019-08-30 | 2022-04-01 | 杨建强 | Modified red mud-based dry soil water retention agent and preparation method and application thereof |
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Application publication date: 20190607 |