CN110240456A - A kind of processing method and heavy metal ion-sulphate aluminium cement-bentonite composite material containing heavy metal ion industrial wastewater - Google Patents
A kind of processing method and heavy metal ion-sulphate aluminium cement-bentonite composite material containing heavy metal ion industrial wastewater Download PDFInfo
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- CN110240456A CN110240456A CN201910672951.6A CN201910672951A CN110240456A CN 110240456 A CN110240456 A CN 110240456A CN 201910672951 A CN201910672951 A CN 201910672951A CN 110240456 A CN110240456 A CN 110240456A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
- C04B2111/00784—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes for disposal only
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Abstract
The invention belongs to technical field of heavy metal wastewater treatment, and in particular to a kind of processing method and heavy metal ion-sulphate aluminium cement-bentonite composite material containing heavy metal ion industrial wastewater.The type and concentration of heavy metals in industrial wastewater ion are detected first；Then sulphate aluminium cement, bentonite, water-reducing agent and intermediate sand are mixed in a certain ratio uniformly, then heavy metal solution are added in the form of mixing water and is stirred evenly, the composite material can be obtained, this method material is to Cr3+、Pb2+Curing degree reached 99%.This method to the solidification effect of heavy metal ion with solidification stability is preferable, cost of material is low, treatment process is simple, reduce sludge accumulating amount and curing heavy metal after it is reusable in building basic material or roadbed material, be suitble to popularization and application.
Description
Technical field
The invention belongs to technical field of heavy metal wastewater treatment, and in particular to a kind of place containing heavy metal ion industrial wastewater
Reason method and heavy metal ion-sulphate aluminium cement-bentonite composite material.
Background technique
Heavy metal wastewater thereby source is wide, water is big, drained mainly from mine drainage, waste-rock yard leaching water, ore dressing field tailing,
Non-ferrous metals smelting works' dedusting draining, Non-ferrous Metals Processing Factory's pickling waste waters, electroplate factory's plating piece washing water, steel plant's pickling draining
And the various industrial wastewaters such as electrolysis, pesticide, medicine, paint and dyestuff.There is heavy metal toxic effect to continue for a long time, biological non-degradable
The characteristics of, even if heavy metals in industrial wastewater concentration is small, it can also be absorbed by plant and other biological, enrichment, then pass through food
Chain is accumulated in people, animal body, directly affects plant, animal even human health.Increasingly the heavy metal pollution aggravated is to people
The living safety of class constitutes significant threat.It is difficult to control and there is very strong diffusible water pollution also to become human health, warp
The major obstacles of Ji and social sustainable development.Therefore, the handling problems containing heavy metal ion industrial wastewater have become urgently
Significant problem to be solved.
Currently, process for treating heavy-metal waste water can be divided into three classes: (1) chemical Treatment method；(2) physical treatment process；(3)
Biological treatment.Method of chemical treatment is primarily referred to as by adding chemical reagent, occur chemical reaction removal heavy metal in waste water from
The method of son, can specifically be divided into neutralization precipitation method, sulphide precipitation, ferrite coprecipitation, chemical reduction method etc., be applicable in
In the processing of the effluent containing heavy metal ions containing higher concentration, but it is chemically treated heavy metal wastewater thereby and is gone generally by coprecipitation mode
It removes, is easy to produce new pollutant, causes secondary pollution；Physical treatment process refers to that the heavy metal in waste water is not changing its chemistry
The method adsorbed under conditions of form, be concentrated, separated, specific method have absorption method, ion-exchange, membrane separation process etc.,
Physical treatment process is good to heavy metals removal effect and will not generate secondary pollution, but this method treatment process is more numerous, and handles
Higher cost；Biological treatment refers to be gone by the effects of flocculation of plant, microorganism or derivatives thereof, absorption, accumulation, enrichment
Except the method for heavy metal in waste water, bioflocculation, biological adsorption, phytoremediation etc., biological treatment technique letter particularly may be divided into
It is single, at low cost, but it is lower to the removal efficiency of the effluent containing heavy metal ions containing higher concentration.
Patent CN108911136A discloses a kind of processing method of heavy metal wastewater thereby, carries out first to heavy metal wastewater thereby equal
Matter processing keeps the heavy metal wastewater thereby water quality from different processes balanced, then the heavy metal wastewater thereby after Anaerobic Treatment is raw in film
The aerobic circular treatment of anaerobism # is carried out in object reactor, during Anaerobic Treatment, heavy metal ion occurs under microbial action
It restores, is filled with the hollow-fibre membrane containing quinonyl in the membrane bioreactor of this application, the quinonyl in tunica fibrosa is as electronics
Mediator can speed up the lipase- catalyzed of heavy metal ion in anaerobic processes, to reach the mesh of efficient removal heavy metal ion
's.But the treatment process is miscellaneous, process cycle is longer, and tunica fibrosa higher cost.
Patent CN109553215A discloses a kind of processing method of electroplating wastewater, including reduction, alkaline chemical precipitation, oxidation,
Flocculating setting adjusts discharge, wherein includes a kind of amphiprotic high-molecule chelated flocculating agent PDMAMDTC in flocculating setting flocculant；
Above-mentioned amphiprotic high-molecule chelated flocculating agent PDMAMDTC is drawn with dimethyl diallyl ammonium chloride and acrylamide by ammonium persulfate
Hair, copolymerization constitutes basic framework, then links formaldehyde and triethylene tetramine, is then caused and by acryloyl morpholine, imidazoline in alkali
Property environment under reacted with carbon disulfide be made.The processing method treatment effect for the electroplating wastewater that this application provides is excellent, is processed into
This is low, but flocculant preparation process is cumbersome and formaldehyde used is harmful to the human body.
Patent CN108101253A discloses a kind of processing method of heavy metal wastewater thereby, includes the following steps: that (1) is made except iron
Industry adjusts the pH value of waste water to 4-5, flocculant, the iron ion in sedimentation removal waste water is added；(2) heavy copper operation, to through step
(1) vulcanized sodium and flocculant, the copper ion in sedimentation removal waste water are added in treated supernatant；(3) operation is neutralized, is adjusted
To 6-7 flocculant is added, the heavy metal ion in sedimentation removal waste water obtains in pH value through step (2) treated supernatant
The clear water of qualified discharge, this application can be effectively removed the heavy metal in waste water, and waste water is made to meet discharge standard.But it should
Vulcanized sodium used in method itself is toxic, if vulcanized sodium is excessive, the H also easily generated in acid waste water2S causes secondary pollution.
Patent CN108975566A discloses a kind of processing method of electroplating wastewater, and this method is used equipped with iron plate electrode
Electrolysis unit is powered in the clear water injection electrolyte tank body added with electrolyte and implements electrolysis water, generated rich in after ferrous ion
It is discharged into storage bin storage, the aqueous solution that then will be enriched in ferrous ion is filled in proportion in the electroplating wastewater of processing pond, is restored
Heavy metal in waste water；It adjusts the PH of mixed liquor in processing pond and flocculant PAM is added, sample detection content of beary metal is qualified
After be discharged into sedimentation basin and precipitated.But this method needs to consume electric energy, operation and maintenance cost is higher, and precipitating also needs further
Processing.
Summary of the invention
To solve problems of the prior art, the purpose of the present invention is to provide a kind of Industry Wastes containing heavy metal ion
The processing method and heavy metal ion-sulphate aluminium cement-bentonite composite material of water, this method have solid to heavy metal ion
Change excellent effect, the feature that processing cost is low, treatment process is simple, process is short, without secondary pollution.
The technical solution adopted by the invention is as follows:
A kind of processing method containing heavy metal ion industrial wastewater, comprising the following steps:
Sulphate aluminium cement, bentonite, water-reducing agent and quartz sand are mixed and stirred for uniformly, sulphur aluminic acid being made by step 1
Salt cement-bentonite composite material；
Step 2, is added into sulphate aluminium cement-bentonite composite material and contains heavy metal ion industrial wastewater, and stirring is equal
It is even, obtain mixture；
The mixture moulding by casting that step 2 obtains is entered mould maintenance, made containing in heavy metal ion industrial wastewater by step 3
Heavy metal ion be cured processing.
In the step 1, in terms of mass fraction, by 50~100 parts of sulphate aluminium cement, 10~50 parts of bentonite,
0.8~1.2 part of water-reducing agent, 150~200 parts of intermediate sand are mixed and stirred for uniformly, it is multiple that sulphate aluminium cement-bentonite being made
Condensation material.
In step 1, mixing speed is 300~600rpm, and mixing time is 5~10min.
In step 2, mixing speed is 1000~1500rpm, and mixing time is 3~5min.
Sulphate aluminium cement in the step 1 is the low-alkalinity sulphoaluminate cement of 42.5 strength grades.
Bentonite in the step 1 is the combination of one or both of sodium bentonite and calcium-base bentonite.
Water-reducing agent in the step 1 is naphthalene water reducer, sulfamate water reducer or polycarboxylate water-reducer, diminishing
Rate 15%~35%.
Intermediate sand in the step 1 is the intermediate sand according to the ISO standard required.
It in step 2, is calculated in mass percent, is added into every 1000 parts of sulphate aluminium cement-bentonite composite materials
465-925 parts contain heavy metal ion industrial wastewater.
A kind of heavy metal ion-sulphate aluminium cement-bentonite composite material, the heavy metal ion-aluminium sulfate water
The above-mentioned processing method containing heavy metal ion industrial wastewater obtains mud-bentonite composite material through the invention, the step 3
In, the mixture moulding by casting that step 2 obtains is entered into mould maintenance, obtains the heavy metal ion-sulphate aluminium cement-swelling
Soil composite material.
Compared with the prior art, the present invention has the following beneficial effects:
Processing method provided by the invention containing heavy metal industrial effluent mainly will contain heavy metal industrial effluent with mix
The form of water is added in sulphate aluminium cement-bentonite composite material, stirs evenly, obtains mixture, the mixture that will be obtained
Moulding by casting enters mould maintenance, makes the processing that is cured containing the heavy metal ion in heavy metal ion industrial wastewater；Made in this method
It is sulphate aluminium cement-bentonite composite material to the material that heavy metal plays solidification, wherein sulphate aluminium cement
Main hydration products be entringite and gel aluminum hydroxide, wherein entringite basic structural unit is [Ca3Al(OH)6·
12H2O], by Al (OH)6Octahedra chain composition, around in conjunction with three calcium polyhedrons, be equipped on each calcium polyhedron OH- with
And four hydrones, it constitutes and is parallel to the lens cylinder of needle shaft, and SO4 2-And H2O is then received in channel between them, is led to
Road structure relatively easily can substitute SO with the oxygen anion of similar structures and radius4 2-, such as AsO4 3-、CO3 2-、NO3 -、
SeO4 2-、CrO4 2-Or B (OH)4 -, and by chemistry displacement and surface electronegativity, entringite can accommodate many outer in crystal intercolumniation
Come ion, such as Al3+It can be by Fe3+、Cr3+、Mn3+Deng substitution, Ca2+It can be by Mg2+、Zn2+、Mn2+、Fe2+、Co2+Or Ni2+Replace.
In addition, gel aluminum hydroxide also has stronger adsorption capacity, adsorbing heavy metal ions.The bentonitic crystal structure of incorporation
It is similar to silicate mineral, Si therein4+By Al3+Replace, and K+、Na+、Ca2+、Mg2+Excess charges are compensated Deng cation,
Heavy metal ion can replace above-mentioned cation by ion exchange in aqueous solution；Bentonite clay particle surface can also form water
Oxide cover layer is closed, makes its surface in elecrtonegativity, is conducive to Absorptive complex wave heavy metal ion.In addition, bentonite clay particle is thinner,
With biggish specific surface area, there is certain physisorption to heavy metal ion.In conclusion this method is simply easily grasped
Work, process are short.Harmless, higher to the curing degree of the heavy metal ion, prices of raw materials are cheap and abundance, without secondary
It pollutes and considerably reduces sludge accumulating amount.
Heavy metal ion-sulphate aluminium cement-bentonite composite material presetting period of the present invention is 33~158min, final set
Time is 39~188min, 1d compression strength is 1.05~26.83MPa, 7d compression strength is 1.58~33.59MPa, 28d is anti-
Compressive Strength is 1.78~42.28MPa, has good workability, can be used for can be applied to building basic material
Or in roadbed material；And content of beary metal is low, content of beary metal can satisfy hazardous waste judging standard and leaching characteristic identification
Regulation in standard (GB5085.3-2007).
Specific embodiment
Below with reference to embodiment, the present invention is described further.
The invention proposes a kind of processing methods containing heavy metal ion industrial wastewater, comprising the following steps:
Step 1, using inductive coupling plasma emission spectrum method detection heavy metals in industrial wastewater ion type with it is dense
Degree；
Sulphate aluminium cement, bentonite, water-reducing agent and quartz sand are uniformly mixed in blender, sulphur are made by step 2
Aluminate cement-bentonite composite material, wherein mixing speed is 300~600rpm, and mixing time is 5~10min；Then
The industrial wastewater of the known heavy metal concentration in step 1 is added into sulphate aluminium cement-bentonite composite material, 1000
It is stirred evenly under~1500rpm, obtains mixture, mixing time is 3~5min；
Then mixture moulding by casting is entered mould maintenance, made containing the heavy metal in heavy metal ion industrial wastewater by step 3
Ion is cured processing, and maintenance resulting materials are heavy metal ion-sulphate aluminium cement-bentonite composite material.
In the present invention, the raw material in the processing method containing heavy metal ion industrial wastewater includes sulphate aluminium cement, swelling
Soil, water-reducing agent, intermediate sand, each component mass fraction are as follows: sulphate aluminium cement is 50~100 parts, and bentonite is 10~50 parts,
Water-reducing agent is 0.8~1.2 part, and intermediate sand is 150~200 parts.Sulphate aluminium cement uses the low alkalinity sulphur of 42.5 strength grades
Aluminate cement；Bentonite uses the combination of one or both of sodium bentonite and calcium-base bentonite；Water-reducing agent uses naphthalene
Based water reducer, sulfamate water reducer or polycarboxylate water-reducer, water-reducing rate 15%~35%；Intermediate sand is marked using ISO is met
The intermediate sand of alignment request.It is calculated in mass percent, 465- is added into every 1000 parts of sulphate aluminium cement-bentonite composite materials
925 parts contain heavy metal ion industrial wastewater.Gained heavy metal ion-sulphate aluminium cement-bentonite composite material can be applied
In building basic material or roadbed material.
Embodiment 1
2g chromic nitrate is added in 465g water and is stirred evenly, until chromic nitrate is completely dissolved；By 900g sulphate aluminium cement,
100g calcium-base bentonite, 12g sulfamate water reducer and 2000g middle rank sand are uniformly mixed and made into dry mash in blender,
Mixing speed is 300rpm, mixing time 5min；Then chromium nitrate solution is added into mixture, is stirred at 1000rpm
Uniformly, mixing time 3min；Then mixture moulding by casting is entered into mould maintenance, obtains curing degree just as 99.967%, initial set
Time 33min, final setting time 43min, 1d compression strength 22.96MPa, 7d compression strength 32.43MPa, 28d compression strength
Heavy metal ion-sulphate aluminium cement-bentonite composite material of 40.82MPa carries out Leaching examination according to horizontal vibration method
It tests, 100g heavy metal ion-sulphate aluminium cement-bentonite composite material is measured using Inductively coupled plasma optical emission spectrometer
The Cr in 1L deionized water3+Leaching concentration be 0.669mg/L, be far below hazardous waste judging standard and leaching characteristic identification mark
Total Cr leaching concentration limit value 15mg/L specified in quasi- (GB5085.3-2007).
Embodiment 2
6g chromic nitrate is added in 465g water and is stirred evenly, until chromic nitrate is completely dissolved；By 900g sulphate aluminium cement,
100g calcium-base bentonite, 10g naphthalene water reducer and 2000g middle rank sand are uniformly mixed and made into dry mash, stirring speed in blender
Degree is 300rpm, mixing time 5min；Then chromium nitrate solution is added into mixture, stirs evenly, stirs at 1200rpm
Mixing the time is 3min；Then mixture moulding by casting is entered into mould maintenance, just obtaining curing degree is 99.992%, presetting period
59min, final setting time 66min, 1d compression strength 26.83MPa, 7d compression strength 30.29MPa, 28d compression strength 33.88MPa
Heavy metal ion-sulphate aluminium cement-bentonite composite material, according to horizontal vibration method carry out leaching toxicity test, use
Inductively coupled plasma optical emission spectrometer measures 100g heavy metal ion-sulphate aluminium cement-bentonite composite material and goes in 1L
Cr in ionized water3+Leaching concentration be 0.491mg/L, be far below hazardous waste judging standard and leaching characteristic identification standard
(GB5085.3-2007) total Cr leaching concentration limit value 15mg/L specified in.
Embodiment 3
10g chromic nitrate is added in 465g water and is stirred evenly, until chromic nitrate is completely dissolved；By 900g aluminium sulfate water
Mud, 100g sodium bentonite, 8g polycarboxylate water-reducer and 2000g middle rank sand are uniformly mixed and made into dry mash in blender, stir
Mixing speed is 300rpm, mixing time 5min；Then chromium nitrate solution is added into mixture, stirring is equal at 1500 rpm
It is even, mixing time 3min；Then by mixture moulding by casting enter mould maintenance, just obtain curing degree be 99.998%, initial set when
79min, final setting time 89min, 1d compression strength 21.80MPa, 7d compression strength 29.19MPa, 28d compression strength 32.13MPa
Heavy metal ion-sulphate aluminium cement-bentonite composite material, according to horizontal vibration method carry out leaching toxicity test, use
Inductively coupled plasma optical emission spectrometer measures 100g heavy metal ion-sulphate aluminium cement-bentonite composite material and goes in 1L
Cr in ionized water3+Leaching concentration be 0.246mg/L, be far below hazardous waste judging standard and leaching characteristic identification standard
(GB5085.3-2007) total Cr leaching concentration limit value 15mg/L specified in.
Embodiment 4
2g plumbi nitras is added in 465g water and is stirred evenly, until plumbi nitras is completely dissolved；By 900g sulphate aluminium cement,
100g calcium-base bentonite, 12g sulfamate water reducer and 2000g middle rank sand are uniformly mixed and made into dry mash in blender,
Mixing speed is 300rpm, mixing time 5min；Then lead nitrate solution is added into mixture, is stirred at 1000rpm
Uniformly, mixing time 3min；Then mixture moulding by casting is entered into mould maintenance, obtains curing degree just as 99.997%, initial set
Time 34min, final setting time 39min, 1d compression strength 18.34MPa, 7d compression strength 30.31MPa, 28d compression strength
Heavy metal ion-sulphate aluminium cement-bentonite composite material of 36.42MPa carries out Leaching examination according to horizontal vibration method
It tests, 100g heavy metal ion-sulphate aluminium cement-bentonite composite material is measured using Inductively coupled plasma optical emission spectrometer
The Pb in 1L deionized water2+Leaching concentration be 0.047mg/L, be far below hazardous waste judging standard and leaching characteristic identification mark
Total Pb leaching concentration limit value 5mg/L specified in quasi- (GB5085.3-2007).
Embodiment 5
6g plumbi nitras is added in 465g water and is stirred evenly, until plumbi nitras is completely dissolved；By 900g sulphate aluminium cement,
100g sodium bentonite, 8g naphthalene water reducer and 2000g middle rank sand are uniformly mixed and made into dry mash, mixing speed in blender
For 300rpm, mixing time 5min；Then lead nitrate solution is added into mixture, is stirred evenly at 1200rpm, stirs
Time is 3min；Then by mixture moulding by casting enter mould maintenance, just obtain curing degree be 99.998%, presetting period 52min,
A huge sum of money of final setting time 58min, 1d compression strength 19.74MPa, 7d compression strength 33.59MPa, 28d compression strength 42.28MPa
Belong to ion-sulphate aluminium cement-bentonite composite material, leaching toxicity test is carried out according to horizontal vibration method, using inductance coupling
It closes plasma emission spectrometer and measures 100g heavy metal ion-sulphate aluminium cement-bentonite composite material in 1L deionized water
Middle Pb2+Leaching concentration be 0.097mg/L, be far below hazardous waste judging standard and leaching characteristic identification standard (GB5085.3-
2007) total Pb leaching concentration limit value 5mg/L specified in.
Embodiment 6
10g plumbi nitras is added in 465g water and is stirred evenly, until plumbi nitras is completely dissolved；By 900g aluminium sulfate water
Mud, 100g sodium bentonite, 10g naphthalene water reducer and 2000g middle rank sand are uniformly mixed and made into dry mash in blender, stirring
Speed is 300rpm, mixing time 5min；Then lead nitrate solution is added into mixture, stirs evenly at 1500 rpm,
Mixing time is 3min；Then mixture moulding by casting is entered into mould maintenance, just obtaining curing degree is 99.997%, presetting period
66min, final setting time 71min, 1d compression strength 18.83MPa, 7d compression strength 30.40MPa, 28d compression strength 33.67MPa
Heavy metal ion-sulphate aluminium cement-bentonite composite material, according to horizontal vibration method carry out leaching toxicity test, use
Inductively coupled plasma optical emission spectrometer measures 100g heavy metal ion-sulphate aluminium cement-bentonite composite material and goes in 1L
Pb in ionized water2+Leaching concentration be 0.275mg/L, be far below hazardous waste judging standard and leaching characteristic identification standard
(GB5085.3-2007) total Pb leaching concentration limit value 5mg/L specified in.
Embodiment 7
10g chromic nitrate is added in 580g water and is stirred evenly, until chromic nitrate is completely dissolved；By 800g aluminium sulfate water
Mud, 200g calcium-base bentonite, 10g naphthalene water reducer and 2000g middle rank sand are uniformly mixed and made into dry mash in blender, stirring
Speed is 450rpm, mixing time 8min；Then chromium nitrate solution is added into mixture, stirs evenly at 1500 rpm,
Mixing time is 4min；Then mixture moulding by casting is entered into mould maintenance, just obtaining curing degree is 99.997%, presetting period
87min, final setting time 96min, 1d compression strength 11.05MPa, 7d compression strength 15.08MPa, 28d compression strength 17.33MPa
Heavy metal ion-sulphate aluminium cement-bentonite composite material, according to horizontal vibration method carry out leaching toxicity test, use
Inductively coupled plasma optical emission spectrometer measures 100g heavy metal ion-sulphate aluminium cement-bentonite composite material and goes in 1L
Cr in ionized water3+Leaching concentration be 0.327mg/L, be far below hazardous waste judging standard and leaching characteristic identification standard
(GB5085.3-2007) total Cr leaching concentration limit value 15mg/L specified in.
Embodiment 8
10g plumbi nitras is added in 580g water and is stirred evenly, until plumbi nitras is completely dissolved；By 800g aluminium sulfate water
Mud, 200g sodium bentonite, 8g polycarboxylate water-reducer and 2000g middle rank sand are uniformly mixed and made into dry mash in blender, stir
Mixing speed is 450rpm, mixing time 8min；Then lead nitrate solution is added into mixture, stirring is equal at 1500 rpm
It is even, mixing time 4min；Then by mixture moulding by casting enter mould maintenance, just obtain curing degree be 99.995%, initial set when
Between 80min, final setting time 85min, 1d compression strength 10.81MPa, 7d compression strength 18.60MPa, 28d compression strength
Heavy metal ion-sulphate aluminium cement-bentonite composite material of 22.72MPa carries out Leaching examination according to horizontal vibration method
It tests, 100g heavy metal ion-sulphate aluminium cement-bentonite composite material is measured using Inductively coupled plasma optical emission spectrometer
The Pb in 1L deionized water2+Leaching concentration be 0.498mg/L, be far below hazardous waste judging standard and leaching characteristic identification mark
Total Pb leaching concentration limit value 5mg/L specified in quasi- (GB5085.3-2007).
Embodiment 9
6g chromic nitrate is added in 925g water and is stirred evenly, until chromic nitrate is completely dissolved；By 500g sulphate aluminium cement,
500g calcium-base bentonite, 10g naphthalene water reducer and 2000g middle rank sand are uniformly mixed and made into dry mash, stirring speed in blender
Degree is 600rpm, mixing time 10min；Then chromium nitrate solution is added into mixture, is stirred evenly at 1200rpm,
Mixing time is 5min；Then mixture moulding by casting is entered into mould maintenance, just obtaining curing degree is 99.991%, presetting period
158min, final setting time 188min, 1d compression strength 1.05MPa, 7d compression strength 1.58MPa, 28d compression strength 1.78MPa
Heavy metal ion-sulphate aluminium cement-bentonite composite material, according to horizontal vibration method carry out leaching toxicity test, use
Inductively coupled plasma optical emission spectrometer measures 100g heavy metal ion-sulphate aluminium cement-bentonite composite material and goes in 1L
Cr in ionized water3+Leaching concentration be 0.570mg/L, be far below hazardous waste judging standard and leaching characteristic identification standard
(GB5085.3-2007) total Cr leaching concentration limit value 15mg/L specified in.
Embodiment 10
10g plumbi nitras is added in 580g water and is stirred evenly, until plumbi nitras is completely dissolved；By 500g aluminium sulfate water
Mud, 500g sodium bentonite, 8g polycarboxylate water-reducer and 2000g middle rank sand are uniformly mixed and made into dry mash in blender, stir
Mixing speed is 600rpm, mixing time 10min；Then lead nitrate solution is added into mixture, stirring is equal at 1500 rpm
It is even, mixing time 5min；Then by mixture moulding by casting enter mould maintenance, just obtain curing degree be 99.996%, initial set when
Between 148min, final setting time 178min, 1d compression strength 1.49MPa, 7d compression strength 1.85MPa, 28d compression strength
Heavy metal ion-sulphate aluminium cement-bentonite composite material of 2.21MPa carries out Leaching examination according to horizontal vibration method
It tests, 100g heavy metal ion-sulphate aluminium cement-bentonite composite material is measured using Inductively coupled plasma optical emission spectrometer
The Pb in 1L deionized water2+Leaching concentration be 0.447mg/L, be far below hazardous waste judging standard and leaching characteristic identification mark
Total Pb leaching concentration limit value 5mg/L specified in quasi- (GB5085.3-2007).
In summary it can be seen, the present invention to the solidification effect of heavy metal ion with solidification stability is preferable, cost of material is low,
Treatment process is simple, reduce sludge accumulating amount and curing heavy metal after it is reusable in building basic material or roadbed material
In material, it is suitble to promote and apply.
Claims (10)
1. a kind of processing method containing heavy metal ion industrial wastewater, which comprises the following steps:
Sulphate aluminium cement, bentonite, water-reducing agent and quartz sand are mixed and stirred for uniformly, aluminium sulfate water being made by step 1
Mud-bentonite composite material；
Step 2 is added into sulphate aluminium cement-bentonite composite material and contains heavy metal ion industrial wastewater, stirs evenly,
Obtain mixture；
The mixture moulding by casting that step 2 obtains is entered mould maintenance, made containing the weight in heavy metal ion industrial wastewater by step 3
Metal ion is cured processing.
2. a kind of processing method containing heavy metal ion industrial wastewater according to claim 1, which is characterized in that the step
In rapid one, in terms of mass fraction, by 50~100 parts of sulphate aluminium cement, 10~50 parts of bentonite, 0.8~1.2 part subtracts
Aqua, 150~200 parts of intermediate sand are mixed and stirred for uniformly, sulphate aluminium cement-bentonite composite material being made.
3. a kind of processing method containing heavy metal ion industrial wastewater according to claim 1, which is characterized in that step 1
In, mixing speed is 300~600rpm, and mixing time is 5~10min.
4. a kind of processing method containing heavy metal ion industrial wastewater according to claim 1, which is characterized in that step 2
In, mixing speed is 1000~1500rpm, and mixing time is 3~5min.
5. a kind of processing method containing heavy metal ion industrial wastewater according to claim 1, is characterized in that, the step
Sulphate aluminium cement in one is the low-alkalinity sulphoaluminate cement of 42.5 strength grades.
6. a kind of processing method containing heavy metal ion industrial wastewater according to claim 1, which is characterized in that the step
Bentonite in rapid one is the combination of one or both of sodium bentonite and calcium-base bentonite.
7. a kind of processing method containing heavy metal ion industrial wastewater according to claim 1, which is characterized in that the step
Water-reducing agent in rapid one is naphthalene water reducer, sulfamate water reducer or polycarboxylate water-reducer, water-reducing rate 15%~35%.
8. a kind of processing method containing heavy metal ion industrial wastewater according to claim 1, which is characterized in that the step
Intermediate sand in rapid one is the intermediate sand according to the ISO standard required.
9. a kind of processing method containing heavy metal ion industrial wastewater according to claim 1, which is characterized in that step 2
In, it is calculated in mass percent, 465-925 parts is added into every 1000 parts of sulphate aluminium cement-bentonite composite materials containing a huge sum of money
Belong to ion industrial wastewater.
10. a kind of heavy metal ion-sulphate aluminium cement-bentonite composite material, which is characterized in that the heavy metal ion-
Sulphate aluminium cement-bentonite composite material contains heavy metal ion industrial wastewater by described in any one of claim 1-9
Processing method obtain.
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