CN106978183A - A kind of preparation method of Palygorskite base heavy metal-polluted soil passivating material - Google Patents
A kind of preparation method of Palygorskite base heavy metal-polluted soil passivating material Download PDFInfo
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- CN106978183A CN106978183A CN201710200077.7A CN201710200077A CN106978183A CN 106978183 A CN106978183 A CN 106978183A CN 201710200077 A CN201710200077 A CN 201710200077A CN 106978183 A CN106978183 A CN 106978183A
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- palygorskite
- clay
- acid solution
- sulfuric acid
- heavy metal
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- 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
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/04—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only applied in a physical form other than a solution or a grout, e.g. as granules or gases
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- 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
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/08—Aluminium compounds, e.g. aluminium hydroxide
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- 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
- C09K2101/00—Agricultural use
Abstract
The present invention relates to environment-friendly materials and its preparing technical field, particularly a kind of preparation method of Palygorskite base heavy metal-polluted soil passivating material.Palygorskite clay is used as the wide variety of nonmetallic clay mineral in heavy-metal contaminated soil reparation at present, it is abundant in Mineral Resources in China, it is cheap, and palygorskite clay has absorption harmful and various organic and inorganic pollution function, secondary pollution will not be produced simultaneously, has the advantages that other nonmetallic minerals are incomparable.The later palygorskite clay of acidified processing, eliminate the impurity in palygorskite clay, the brilliant beam of state of aggregation is also disperseed, octahedral cations gradually dissolve, micropore canals expand, and have reached the purpose of purifying palygorskite clay, have improved its specific surface area, there is facilitation to absorption property and ion-exchange capacity, so that the palygorskite clay after being acidified has more application value and economic value than untreated palygorskite clay.
Description
Technical field
The present invention relates to environment-friendly materials and its preparing technical field, particularly a kind of Palygorskite base heavy metal-polluted soil
The preparation method of passivating material.
Background technology
Soil is Main Natural Resources for the survival of mankind, is also the important component of human ecological environment.With
The pollution of heavy metal is increasingly serious in the fast development of industrial or agricultural, soil-plant-environmental system.
Heavy metal contaminated soil remediation technology is studied and demonstrated for China, and has started to heavy-metal contaminated soil
The implementation of recovery project, major technique includes barrier landfill, curing/stabilizing, phytoremediation, soil cleaning, Thermal desorption and electricity
It is dynamic to repair.Wherein first three technology has successful Engineering Projects at home, and soil cleaning and mercury contaminated soil Thermal desorption have entered
Row engineering mimoir, electro reclamation is at present also in the laboratory research stage.
In recent years, for the reparation of mild or moderate contaminated soil, the research of in-situ passivation technology has largely been carried out.Heavy metal is former
Position passivating technique is a kind of restorative procedure of contaminated soil, points to contaminated soil and adds some active materials, to reduce heavy metal
Valid density in soil changes its redox state, so as to effectively reduce its migration, toxicity and biological effectiveness.
Wide variety of in heavy-metal contaminated soil reparation at present is non-metal clay mineral, such as bentonite, sepiolite, zeolite.
But existing palygorskite base heavy metal passivating material is only crushing, mixing, and simply directly dispensing is used after modification, palygorskite
Practical effect is limited, needs to continue to increase palygorskite consumption to reach that purpose is repaired in soil pollution, causes palygorskite
Waste and consumption is increased.
The content of the invention
It is an object of the invention to provide the Palygorskite base soil huge sum of money that a kind of utilization rate height, modified effect are protruded
Belong to the preparation method of passivating material.
The technical solution adopted for the present invention to solve the technical problems is as follows：
A kind of preparation method of Palygorskite base heavy metal-polluted soil passivating material, is comprised the following steps：
A, dry naturally
Palygorskite ore is dried 3-7 days in the sunlight, prevents rainwater from soaking palygorskite；
B, broken sieving
Palygorskite ore is broken into palygorskite clay, sieve aperture 150-200 mesh is filtered in palygorskite clay sieving；
C, alkali chelating
Palygorskite clay is mixed with sulfuric acid solution, stirring is well mixed it；
D, precipitation dries pulverizing
Mixed liquor is staticly settled, and is dried sediment and is crushed, finished product.
Palygorskite clay presses solid-to-liquid ratio 1 with sulfuric acid solution in the step C：10 mixing, sulfuric acid solution mass concentration 2.5 ~
12 ~ 108h is stirred under conditions of 20%, the r/min of low whipping speed 500, it is well mixed.
Palygorskite clay presses solid-to-liquid ratio 1 with sulfuric acid solution in the step C：10 mixing, sulfuric acid solution mass concentration 2.5 ~
72h is stirred under conditions of 20%, the r/min of low whipping speed 500, it is well mixed.
Palygorskite clay presses solid-to-liquid ratio 1 with sulfuric acid solution in the step C：10 mixing, sulfuric acid solution mass concentration
72h is stirred under conditions of 12.5%, the r/min of low whipping speed 500, it is well mixed.
Sediment is dried at 70 DEG C in the step D.
Beneficial effects of the present invention are：
1st, palygorskite ore is dried 3-7 days in the sunlight, not by the way of heating, drying and prevents rainwater from soaking palygorskite；First
Broken sieving is carried out after daylight is dried, the chemical substance being effectively ensured in palygorskite ore is stable.In addition dried in the air by daylight
Shine control mineral surface humidity and be easy to follow-up crush.
2nd, palygorskite clay and sulfuric acid solution press solid-to-liquid ratio 1 in the step C：10 mixing, sulfuric acid solution mass concentration 2.5
~20%.Within the above range, the passivation effect of such a passivating material can increase with the increase of sulfuric acid solution mass concentration, but such as
Fruit sulfuric acid solution mass concentration is too high, can change the pH value of soil, influences the normal growth of plant, and research shows, sulphur
Sour solvent content is minimum during acid solution mass concentration 12.5%.
3rd, sediment is dried at 70 DEG C, gets through the inner passage of palygorskite, exposes more inner surfaces and active group
Group.High temperature drying effectively control end properties are avoided, batch production quality is more easy to control.Palygorskite clay have absorption harmful and
The function of various organic and inorganic pollution, it is saturating that palygorskite clay can not only break soil hardening, chesson, raising soil
Gas, the reduction soil weight, promote soil microbial activities, enhancing soil fertility penetration, moreover it is possible to improved soil, administer waste
Desert, water conservation drought resisting strengthens crops antibacterial ability, crop yield is improved, while secondary pollution will not be produced.
Palygorskite clay is used as the wide variety of nonmetallic clay in heavy-metal contaminated soil reparation at present in summary
Mineral, it is abundant in Mineral Resources in China, cheap, and palygorskite clay has absorption harmful and various organic and inorganic dirt
The function of thing is contaminated, while secondary pollution will not be produced, has the advantages that other nonmetallic minerals are incomparable.It is acidified processing with
Palygorskite clay afterwards, eliminates the impurity in palygorskite clay, and the brilliant beam of state of aggregation is also disperseed, and octahedral cations are gradually
Dissolving, micropore canals expand, reached purifying palygorskite clay purpose, improve its specific surface area, to absorption property and from
Sub- exchange capacity has facilitation, so that the palygorskite clay after being acidified has more application value than untreated palygorskite clay
And economic value.
Brief description of the drawings
Fig. 1 influences schematic diagram I for the present invention on the sour solvent content of palygorskite ore；
Fig. 2 influences schematic diagram II for the present invention on the sour solvent content of palygorskite ore.
Embodiment
A kind of preparation method of Palygorskite base heavy metal-polluted soil passivating material, is comprised the following steps：
A, dry naturally
Palygorskite ore is dried 3-7 days in the sunlight, prevents rainwater from soaking palygorskite；
B, broken sieving
Palygorskite ore is broken into palygorskite clay, sieve aperture 150-200 mesh is filtered in palygorskite clay sieving；
C, alkali chelating
Palygorskite clay is mixed with sulfuric acid solution, stirring is well mixed it；
D, precipitation dries pulverizing
Mixed liquor is staticly settled, and is dried sediment and is crushed, finished product.
It is preferred that the step C in palygorskite clay and sulfuric acid solution press solid-to-liquid ratio 1：10 mixing, sulfuric acid solution quality is dense
12 ~ 108h is stirred under conditions of degree 2.5 ~ 20%, the r/min of low whipping speed 500, it is well mixed.
It is preferred that the step C in palygorskite clay and sulfuric acid solution press solid-to-liquid ratio 1：10 mixing, sulfuric acid solution quality is dense
72h is stirred under conditions of degree 2.5 ~ 20%, the r/min of low whipping speed 500, it is well mixed.
It is preferred that the step C in palygorskite clay and sulfuric acid solution press solid-to-liquid ratio 1：10 mixing, sulfuric acid solution quality is dense
72h is stirred under conditions of degree 12.5%, the r/min of low whipping speed 500, it is well mixed.
It is preferred that the step D in sediment dried at 70 DEG C.
Middle palygorskite ore in the embodiment 1 to 3 selects the palygorskite ore that Linze county is exploited.Other ground panelings
Palygorskite ore can also be used for this case.
Embodiment 1
A kind of preparation method of Palygorskite base heavy metal-polluted soil passivating material, is comprised the following steps：
A, dry naturally
Palygorskite ore is dried 3-7 days in the sunlight, prevents rainwater from soaking palygorskite；
B, broken sieving
Palygorskite ore is broken into palygorskite clay, sieve aperture 150-200 mesh is filtered in palygorskite clay sieving；
C, alkali chelating
Palygorskite clay presses solid-to-liquid ratio 1 with sulfuric acid solution：10 mixing, sulfuric acid solution mass concentration 2.5 ~ 20%, low whipping speed
12 ~ 108h is stirred under conditions of 500 r/min, it is well mixed；
D, precipitation dries pulverizing
Mixed liquor is staticly settled, and sediment is dried at 70 DEG C and is crushed, finished product.
Embodiment 2
A kind of preparation method of Palygorskite base heavy metal-polluted soil passivating material, is comprised the following steps：
A, dry naturally
Palygorskite ore is dried 3-7 days in the sunlight, prevents rainwater from soaking palygorskite；
B, broken sieving
Palygorskite ore is broken into palygorskite clay, sieve aperture 150-200 mesh is filtered in palygorskite clay sieving；
C, alkali chelating
Palygorskite clay presses solid-to-liquid ratio 1 with sulfuric acid solution：10 mixing, sulfuric acid solution mass concentration 2.5 ~ 20%, low whipping speed
72h is stirred under conditions of 500 r/min, it is well mixed；
D, precipitation dries pulverizing
Mixed liquor is staticly settled, and sediment is dried at 70 DEG C and is crushed, finished product.
Embodiment 3
A kind of preparation method of Palygorskite base heavy metal-polluted soil passivating material, is comprised the following steps：
A, dry naturally
Palygorskite ore is dried 3-7 days in the sunlight, prevents rainwater from soaking palygorskite；
B, broken sieving
Palygorskite ore is broken into palygorskite clay, sieve aperture 150-200 mesh is filtered in palygorskite clay sieving；
C, alkali chelating
Palygorskite clay presses solid-to-liquid ratio 1 with sulfuric acid solution：10 mixing, sulfuric acid solution mass concentration 12.5%, low whipping speed 500
72h is stirred under conditions of r/min, it is well mixed；
D, precipitation dries pulverizing
Mixed liquor is staticly settled, and sediment is dried at 70 DEG C and is crushed, finished product.
Contrast test
It is 1 in solid-to-liquid ratio：10th, under conditions of mixing speed is 500 r/min, the palygorskite powder of 150 mesh is dispersed in respectively
Mass fraction is 2.5%, 5%, 7.5%, 10%, 12.5%, 15%, 20% H2SO4Acid is carried out in solution, after stirring modified, point
Not in after acid activation 12h, 24h, 36h, 48h, 72h, 96h and 108h, progress staticly settles drying（70 DEG C of drying temperature）Afterwards
To solid product, by Mechanical Crushing and sub-sieve, sour 49 kinds of the modified attapulgite base passivator of 10 mesh is prepared.Difference compound concentration
The Ni contaminated soils for being 400mg/kg for 800mg/kg Cu, Cr, Zn contaminated soil and concentration, are sufficiently stirred for mixing, as people
Work heavy metal pollution soil sample.With addition of the 49 kinds of concave convex rod passivator prepared by 16g/kg, 4 kinds of artificial heavy metals are added
Soil sample is polluted, is sufficiently stirred for mixing, keeps field capacity to carry out after soaking passivation 30 days with deionized water, dries soil sample, survey
Determine heavy metal DTPA extraction state contents.Measurement result See Figure：
Different types of Palygorskite difference heavy metal Cu, Cr, Zn, Ni pollution soil sample Passivation Treatment, heavy as shown in Figure 1
Ni metal, Cr, Zn, Ni available state concentration are with acid treatment H2SO4The change of percentage composition is generally in becoming for rising after falling before
Gesture.The optimal palygorskite acid activation H of the heavy metal-passivated pollution soil sample of Palygorskite2SO4Percentage composition is 12.5%.
As shown in Figure 2 at different types of sour modified attapulgite difference heavy metal Cu, Cr, Zn, Ni pollution soil sample passivation
Reason, heavy metal Cu, Cr, Zn, Ni available state concentration with the change of acid treatment time generally in the trend risen after falling before but
Change is not obvious.The optimal palygorskite acid activation time of the heavy metal-passivated pollution soil sample of Palygorskite is 72h.
Claims (5)
1. a kind of preparation method of Palygorskite base heavy metal-polluted soil passivating material, it is characterised in that comprise the following steps：
A, dry naturally
Palygorskite ore is dried 3-7 days in the sunlight, prevents rainwater from soaking palygorskite；
B, broken sieving
Palygorskite ore is broken into palygorskite clay, sieve aperture 150-200 mesh is filtered in palygorskite clay sieving；
C, alkali chelating
Palygorskite clay is mixed with sulfuric acid solution, stirring is well mixed it；
D, precipitation dries pulverizing
Mixed liquor is staticly settled, and is dried sediment and is crushed, finished product.
2. a kind of preparation method of Palygorskite base heavy metal-polluted soil passivating material, its feature according to claim 1
It is that palygorskite clay and sulfuric acid solution are by solid-to-liquid ratio 1 in the step C：10 mixing, sulfuric acid solution mass concentration 2.5 ~ 20%,
12 ~ 108h is stirred under conditions of the r/min of low whipping speed 500, it is well mixed.
3. a kind of preparation method of Palygorskite base heavy metal-polluted soil passivating material, its feature according to claim 1
It is that palygorskite clay and sulfuric acid solution are by solid-to-liquid ratio 1 in the step C：10 mixing, sulfuric acid solution mass concentration 2.5 ~ 20%,
72h is stirred under conditions of the r/min of low whipping speed 500, it is well mixed.
4. a kind of preparation method of Palygorskite base heavy metal-polluted soil passivating material, its feature according to claim 3
It is that palygorskite clay and sulfuric acid solution are by solid-to-liquid ratio 1 in the step C：10 mixing, sulfuric acid solution mass concentration 12.5%,
72h is stirred under conditions of the r/min of mixing speed 500, it is well mixed.
5. a kind of preparation method of Palygorskite base heavy metal-polluted soil passivating material, its feature according to claim 1
It is in the step D that sediment is dried at 70 DEG C.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107308906A (en) * | 2017-08-21 | 2017-11-03 | 苏州中晟环境修复股份有限公司 | A kind of clay mineral sorbing material of restoration of soil polluted by heavy metal and preparation method thereof |
| CN108586128A (en) * | 2018-05-03 | 2018-09-28 | 新疆泰谷生物肥料有限公司 | A kind of preparation method of slowly releasing trace element fertilizer |
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| CN105295931A (en) * | 2015-11-19 | 2016-02-03 | 兰州坤仑环保科技有限公司 | Attapulgite-based soil heavy metal repairing agent |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107308906A (en) * | 2017-08-21 | 2017-11-03 | 苏州中晟环境修复股份有限公司 | A kind of clay mineral sorbing material of restoration of soil polluted by heavy metal and preparation method thereof |
| CN108586128A (en) * | 2018-05-03 | 2018-09-28 | 新疆泰谷生物肥料有限公司 | A kind of preparation method of slowly releasing trace element fertilizer |
| CN108586128B (en) * | 2018-05-03 | 2021-08-24 | 湖南重金属污染耕地安全高效利用工程研究中心有限公司 | Preparation method of slow-release trace element fertilizer |
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Application publication date: 20170725 |