CN109777437A - A kind of preparation method of heavy metal curing agent - Google Patents
A kind of preparation method of heavy metal curing agent Download PDFInfo
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- CN109777437A CN109777437A CN201910166930.7A CN201910166930A CN109777437A CN 109777437 A CN109777437 A CN 109777437A CN 201910166930 A CN201910166930 A CN 201910166930A CN 109777437 A CN109777437 A CN 109777437A
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- heavy metal
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- red mud
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- metal curing
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- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 30
- 239000000243 solution Substances 0.000 claims abstract description 25
- LEQAOMBKQFMDFZ-UHFFFAOYSA-N glyoxal Chemical compound O=CC=O LEQAOMBKQFMDFZ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 18
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 17
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 16
- 239000010452 phosphate Substances 0.000 claims abstract description 16
- 239000011246 composite particle Substances 0.000 claims abstract description 14
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 14
- 229940015043 glyoxal Drugs 0.000 claims abstract description 12
- 235000019157 thiamine Nutrition 0.000 claims abstract description 9
- 150000003544 thiamines Chemical class 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 8
- 235000012054 meals Nutrition 0.000 claims abstract description 8
- 239000012266 salt solution Substances 0.000 claims abstract description 8
- 239000002699 waste material Substances 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 12
- 239000011790 ferrous sulphate Substances 0.000 claims description 6
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 6
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 6
- 241000537371 Fraxinus caroliniana Species 0.000 claims description 5
- 235000010891 Ptelea trifoliata Nutrition 0.000 claims description 5
- 230000004913 activation Effects 0.000 claims description 5
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 3
- 239000007836 KH2PO4 Substances 0.000 claims description 3
- 229910000397 disodium phosphate Inorganic materials 0.000 claims description 3
- 238000005469 granulation Methods 0.000 claims description 3
- 230000003179 granulation Effects 0.000 claims description 3
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims description 3
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 2
- 229910000150 monocalcium phosphate Inorganic materials 0.000 claims description 2
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical group [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 claims description 2
- 238000005660 chlorination reaction Methods 0.000 claims 1
- 150000002505 iron Chemical class 0.000 claims 1
- 239000002689 soil Substances 0.000 abstract description 29
- 150000002500 ions Chemical class 0.000 abstract description 7
- 238000003837 high-temperature calcination Methods 0.000 abstract description 6
- 239000005416 organic matter Substances 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 abstract 1
- 239000002905 metal composite material Substances 0.000 abstract 1
- 238000005067 remediation Methods 0.000 abstract 1
- 238000007873 sieving Methods 0.000 abstract 1
- 238000007711 solidification Methods 0.000 abstract 1
- 230000008023 solidification Effects 0.000 abstract 1
- 230000007423 decrease Effects 0.000 description 12
- 238000005342 ion exchange Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 7
- 229960002089 ferrous chloride Drugs 0.000 description 6
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 6
- 229920005610 lignin Polymers 0.000 description 6
- 239000003513 alkali Substances 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 229910052785 arsenic Inorganic materials 0.000 description 3
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 3
- 229910052793 cadmium Inorganic materials 0.000 description 3
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 229910001448 ferrous ion Inorganic materials 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 239000004848 polyfunctional curative Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 235000015170 shellfish Nutrition 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical group [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- -1 Ethoxyl Chemical group 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 108010006161 conchiolin Proteins 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000006266 etherification reaction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 150000008442 polyphenolic compounds Chemical class 0.000 description 1
- 235000013824 polyphenols Nutrition 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Abstract
The present invention discloses a kind of preparation method of heavy metal curing agent, will pulverize, is sieved after red mud drying, successively adds ferrous salt solution, black liquid, glyoxal, and microwave activates to obtain red mud composite particles；By shell and diatomite clean dry, pulverize respectively, high-temperature calcination after sieving；It will size mixing under red mud composite particles, conch meal, diatomite in powder, phosphate solution, thiamines room temperature, uniformly mix, be granulated after dry, heavy metal curing agent is prepared；Preparation process of the present invention is simple, raw material sources are extensive, the handling problems of red mud, black liquid and waste shell are solved simultaneously, curing agent has preferable mechanical strength, the ion exchangeable species content of heavy metal in soil can be effectively reduced, realize solidification to Compound Heavy Metals ion, while the release of contained microelement in shell, the organic matter in black liquid provide advantage for ecological environment of soil, provide feasible program for the redevelopment and heavy-metal composite pollution soil remediation of waste.
Description
Technical field
The present invention relates to heavy metal pollution of soil to administer field, is related to a kind of preparation method of heavy metal curing agent.
Background technique
Pollution waste residue of the red mud as aluminum oxide industry production discharge, is currently mainly used the disposition of stockpiling method, occupies big
It measures land resource and will cause the salinization of soil and underground water pollution simultaneously because red mud contains high alkalinity, high salinity, store up
The fugitive dust of generation will destroy the environment on periphery.Currently, being directed to the disposal of resources of red mud, a variety of methods have been explored, have been led to
It crosses and prepares construction material, adsorbent, soil-repairing agent, catalyst etc. and can be realized the effective use of red mud.Wherein utilize red mud
Preparing heavy metal soil-repairing agent can be realized the recycling of red mud, and can solve pollution problem, but due to red mud free alkali
Rate of release is too fast, it will causes the basicity of soil excessively high, destroys ecological environment of soil.
For paper industry using plant fiber resource as primary raw material, production process water consumption is big, and pulping process generates useless
Containing a large amount of cellulose, lignin and inorganic salts etc. in water, the serious of entire water pollution and ecological environment can be caused
It destroys.Wherein lignin is the three-dimensional netted polyphenol quasi polymer of macromolecular, the functional group containing there are many, before application with higher
Scape.The Liginon Resource in black liquid is made full use of, not only can solve the problem of lignin pollution, but also can realize following for conglomerate
Ring development.
With the fast development of shellfish culture and processing industry, a large amount of waste shells of generation accumulate caused environment year by year
Increasingly severe, not only to occupy a large amount of soil, while can also give out dense smell is polluted, environmental problem is caused.Shellfish
Shell contains about 95% calcium carbonate, and it is a kind of nontoxic nothing that other, which are a small amount of organic conchiolin and trace elements K, sodium, phosphorus etc.,
Harmful natural resources.
Therefore, a kind of effective use red mud is found at present, the cooperative disposal method of black liquid and shell is applied to a huge sum of money
Belong to combined contamination soil reparation, the problem of handling the rate of release of red mud free alkali well, be current urgent need to resolve.
Summary of the invention
The present invention for the defects or inadequacies for existing technologies, provide it is a kind of prepare conveniently, economical, effective red mud is multiple
The preparation method of Counter weight metal curing agent, specifically includes the following steps:
(1) it will pulverize after red mud drying, cross 50 meshes, successively add ferrous salt solution, black liquid, glyoxal, 80 ~
Microwave is carried out at 120 DEG C and activates 10 ~ 30min, obtains red mud composite particles；
(2) by shell and diatomite clean dry, pulverize, sieve with 100 mesh sieve respectively, at 900 ~ 1500 DEG C high-temperature calcination 1 ~
2h；
(3) it will mix and size mixing under red mud composite particles, conch meal, diatomite in powder, phosphate solution, thiamines room temperature, uniformly mix,
It is granulated after drying, heavy metal curing agent particle is prepared.
The mass volume ratio mL:g of step (1) red mud dry powder and ferrous salt solution is 1:10 ~ 20, and red mud dry powder and papermaking are black
The mass volume ratio mL:g of liquid is 1:10 ~ 50, and the mass ratio of glyoxal and black liquor is 1:2 ~ 10.
Step (1) ferrous salt is frerrous chloride or ferrous sulfate, and the concentration of ferrous salt solution is 0.5 ~ 1 mol/L.
The power of step (1) microwave activation is 800 ~ 1200W, frequency 1200MHz.
Step (3) red mud composite particles, conch meal, diatomite in powder, phosphate solution, thiamines mixing mass ratio be 40 ~
60:15~30:10~20:1~5:1~5。
Step (3) phosphate is KH2PO4, Ca(H2PO4)2Or Na2HPO4, the concentration of phosphate solution is 0.5~3 mol/
L。
Step (3) is granulated using granulating disc, and revolving speed when granulation is 30 ~ 50r/min, and water ash mass ratio is
0.4~0.6。
Application method of the heavy metal curing agent prepared by the present invention in heavy-metal contaminated soil: curing agent particle is added
Into in the soil of heavy metal pollution, hardener dose is the 3% ~ 10% of contaminated soil quality, and soil moisture content is 15~30%.
The beneficial effects of the present invention are:
(1) heavy metal curing agent is compounded using preparations such as discarded red muds and shell, it being capable of effectively Pb in curing soil2+、
As5+、Cr6+、Cd2+。
(2) great amount of hydroxy group ferriferous oxide can be coated using the modified red mud particle surface of ferrous salt solution, with heavy metal from
Complex reaction occurs for son, and ferrous ion can also be replaced with calcium ion on surface, forms layer of surface activating agent, reinforces to gold
Belong to the combination of ion, the addition of ferrous ion can improve the gel situation of red mud particle, to a certain extent can also be by Cr6+Turn
Turn to Cr3+, realize effectively passivation.
(3) lignin itself in black liquid has a variety of functional groups, wooden by microwave heating under alkali environment
Ethoxyl etherification can occur with glyoxal for element, and reactivity is reinforced, substantially improved in conjunction with the ability of heavy metal ion, and micro-
Wave heating can also greatly improve red mud compounding particle aperture and specific surface area, improve absorption property.
(4) shell after high-temperature calcination, diatomite generate CaO, SiO2Equal substances are formed using lignin as bridging, joint
The reticular structure of ferro-aluminum colloidal silica, the adsorbent materials such as CaO are wrapped in, have certain mechanical strength, substantially improve solidifying
Colloidality energy and absorption property；Phosphate and thiamines can reinforce the combination to metal ion, and free alkali is fixed on red mud
In crystal and colloid in, rate of release slows down, and soil pH is maintained at 6.5 ~ 8.1, will not be by soda acid.
(5) ground such as the organic matter and microelement such as potassium, phosphorus, nitrogen that contain in black liquid and shell, which discharge, can effectively improve
Soil ecology suitability.
(6) operation of the present invention process is simple, and material source is easy to get extensively, and the modification of red mud is synchronous with the modification of lignin
It carries out, Coordination Treatment realizes the comprehensive treatment of soil and the resource utilization of waste.
Specific embodiment
Below by embodiment, invention is further described in detail, but the present invention is not limited only to the content, it is all
Made any modifications, equivalent replacements, and improvements etc. within the spirit and principles in the present invention should all include in protection of the invention
Range etc.
Embodiment 1
A kind of preparation method of heavy metal curing agent, the specific steps are as follows:
(1) it will pulverize after red mud drying, cross 50 meshes, successively add solution of ferrous chloride, black liquid, glyoxal,
Microwave is carried out at 80 DEG C and activates 10min, obtains red mud composite particles, wherein the quality volume of red mud dry powder and solution of ferrous chloride
It is 1:10 than mL:g, solution of ferrous chloride concentration is 0.5mol/L, and the mass volume ratio mL:g of red mud dry powder and black liquid is
The mass ratio of 1:10, glyoxal and black liquor is 1:5, and the power of microwave activation is 800W, and frequency is
1200MHz；
(2) it by shell and diatomite clean dry, pulverizes, sieves with 100 mesh sieve, the high-temperature calcination 2h at 900 DEG C；
(3) by diatomite in powder made from conch meal made from red mud composite particles made from step (1), step (2), step (2),
Phosphate solution, thiamines are that 40:15:10:1:1 is mixed according to mass ratio, and phosphate solution is that concentration is 0.5mol/L's
KH2PO4Solution is sized mixing under room temperature, is uniformly mixed, and is granulated after dry with granulating disc, revolving speed 30r/min, and water ash mass ratio is
0.4, heavy metal curing agent particle is prepared, grain diameter is 1 ~ 3 mm.
The curing agent particle that preparation is completed is added to the soil of heavy metal pollution, hardener dose is contaminated soil quality
3%, soil moisture content is maintained at 20%, and the concentration of heavy metal ion of the contaminated soil of simulation is as shown in table 1 below, after 15 days, lead
Ion-exchange state decrease by 87.71%；The ion-exchange state of arsenic decreases by 89.54%；The ion-exchange state of chromium decreases by
To 86.58%；The ion-exchange state of cadmium decreases by 87.47%.
Table 1
| Pb2+ | As5+ | Cr6+ | Cd2+ | |
| Concentration (mg/kg) | 100 | 100 | 100 | 100 |
Embodiment 2
A kind of preparation method of heavy metal curing agent, the specific steps are as follows:
(2) it will pulverize after red mud drying, cross 50 meshes, successively add solution of ferrous chloride, black liquid, glyoxal,
Microwave is carried out at 100 DEG C and activates 20min, obtains red mud composite particles, wherein the mass body of red mud dry powder and solution of ferrous chloride
Product is 1:15 than mL:g, and solution of ferrous chloride concentration is 1mol/L, and the mass volume ratio mL:g of red mud dry powder and black liquid is
The mass ratio of 1:15, glyoxal and black liquor is 1:10, and the power of microwave activation is 1000W, and frequency is
1200MHz；
(2) it by waste shell and diatomite clean dry, pulverizes, sieves with 100 mesh sieve, the high-temperature calcination 1h at 1500 DEG C；
(3) by diatomite in powder made from conch meal made from red mud composite particles made from step (1), step (2), step (2),
Phosphate solution, thiamines are that 55:25:15:2:3 is mixed according to mass ratio, and phosphate solution is the Ca that concentration is 2mol/L
(H2PO4)2Solution is sized mixing under room temperature, is uniformly mixed, and is granulated after dry with granulating disc, revolving speed 50r/min, water ash mass ratio
It is 0.5, heavy metal curing agent particle is prepared, grain diameter is 1 ~ 3 mm.
The curing agent particle that preparation is completed is added to the soil of heavy metal pollution, curing dose used is contaminated soil
5%, soil moisture content is maintained at 15%, and the concentration of heavy metal ion of the contaminated soil of simulation is same as Example 1, after 15 days,
The ion-exchange state of lead decreases by 89.73%；The ion-exchange state of arsenic decreases by 91.74%；The ion-exchange state range of decrease of chromium
Reach 88.61%；The ion-exchange state of cadmium decreases by 89.37%.
Embodiment 3
A kind of preparation method of heavy metal curing agent, the specific steps are as follows:
(3) it will pulverize after red mud drying, cross 50 meshes, successively add ferrous sulfate solution, black liquid, glyoxal,
Microwave is carried out at 120 DEG C and activates 30min, obtains red mud composite particles, wherein the mass body of red mud dry powder and ferrous sulfate solution
Product is 1:20 than mL:g, and ferrous sulfate solution concentration is 0.8mol/L, the mass volume ratio mL:g of red mud dry powder and black liquid
For 1:50, the mass ratio of glyoxal and black liquor is 1:2, and the power of microwave activation is 1200W, and frequency is
1200MHz；
(2) it by waste shell and diatomite clean dry, pulverizes, sieves with 100 mesh sieve, the high-temperature calcination 1.5h at 1200 DEG C；
(3) by diatomite in powder made from conch meal made from red mud composite particles made from step (1), step (2), step (2),
Phosphate solution, thiamines are that 60:30:20:5:5 is mixed according to mass ratio, and phosphate solution is that concentration is 3mol/L's
Na2HPO4Solution is sized mixing under room temperature, is uniformly mixed, and is granulated after dry with granulating disc, revolving speed 40r/min, water ash mass ratio
It is 0.6, heavy metal curing agent particle is prepared, grain diameter is 1 ~ 3 mm.
The curing agent particle that preparation is completed is added to the soil of heavy metal pollution, curing dose used is contaminated soil
10%, soil moisture content is maintained at 30%, and the concentration of heavy metal ion of the contaminated soil of simulation is same as Example 1, after 15 days,
The ion-exchange state of lead decreases by 92.15%；The ion-exchange state of arsenic decreases by 95.29%；The ion-exchange state range of decrease of chromium
Reach 92.93%；The ion-exchange state of cadmium decreases by 93.21%.
Claims (7)
1. a kind of preparation method of heavy metal curing agent, which is characterized in that specifically includes the following steps:
(1) it will pulverize after red mud drying, cross 50 meshes, successively add ferrous salt solution, black liquid, glyoxal, 80 ~
Microwave is carried out at 120 DEG C and activates 10 ~ 30min, obtains red mud composite particles；
(2) it by waste shell and diatomite clean dry, pulverizes, sieves with 100 mesh sieve respectively, high temperature is forged at 900 ~ 1500 DEG C
Burn 1 ~ 2h；
(3) it will mix and size mixing under red mud composite particles, conch meal, diatomite in powder, phosphate solution, thiamines room temperature, uniformly mix,
It is granulated after drying, heavy metal curing agent particle is prepared.
2. the preparation method of heavy metal curing agent according to claim 1, which is characterized in that step (1) red mud dry powder and Asia
The mass volume ratio mL:g of iron salt solutions is 1:10 ~ 20, the mass volume ratio mL:g of red mud dry powder and black liquid be 1:10 ~
50, the mass ratio of glyoxal and black liquor is 1:2 ~ 10.
3. the preparation method of heavy metal curing agent according to claim 1, which is characterized in that step (1) ferrous salt is chlorination
Ferrous or ferrous sulfate, the concentration of ferrous salt solution are 0.5 ~ 1 mol/L.
4. the preparation method of heavy metal curing agent according to claim 1, which is characterized in that the function of step (1) microwave activation
Rate is 800 ~ 1200W, frequency 1200MHz.
5. the preparation method of heavy metal curing agent according to claim 1, which is characterized in that step (3) red mud composite particles,
The mass ratio that conch meal, diatomite in powder, phosphate solution, thiamines mix is 40 ~ 60:15 ~ 30:10 ~ 20:1 ~ 5:1 ~ 5.
6. the preparation method of heavy metal curing agent according to claim 1, which is characterized in that step (3) phosphate is
KH2PO4, Ca(H2PO4)2Or Na2HPO4, the concentration of phosphate solution is 0.5~3 mol/L.
7. the preparation method of heavy metal curing agent according to claim 1, which is characterized in that step (3) uses disc granulation
Machine is granulated, and revolving speed when granulation is 30 ~ 50r/min, and water ash mass ratio is 0.4 ~ 0.6.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110330978A (en) * | 2019-05-22 | 2019-10-15 | 深圳市深港产学研环保工程技术股份有限公司 | Soil-repairing agent and soil remediation method |
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