CN107586067A - A kind of chromium-polluted soil curing agent and preparation method thereof - Google Patents
A kind of chromium-polluted soil curing agent and preparation method thereof Download PDFInfo
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- CN107586067A CN107586067A CN201710730434.0A CN201710730434A CN107586067A CN 107586067 A CN107586067 A CN 107586067A CN 201710730434 A CN201710730434 A CN 201710730434A CN 107586067 A CN107586067 A CN 107586067A
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Abstract
The invention discloses a kind of chromium-polluted soil curing agent and preparation method thereof, belong to technical field of soil remediation.It is made up of the raw material of following parts by weight：20 30 parts of 30 50 parts of calcium hydroxy phosphate, 30 40 parts of polyethyleneimine surface modification infusorial earth, 20 30 parts of palmitic acid, 10 20 parts of zeolite, 10 20 parts of metakaolin, 5 15 parts of flyash, 5 15 parts of sodium tripolyphosphate, 4 12 parts of ferrous sulfate, 6 12 parts of alkali-activator and slag.The invention also discloses the preparation method of above-mentioned chromium-polluted soil curing agent.The curing agent of the present invention not only has good gelling, also has reproducibility concurrently, the soil after solidification has certain intensity, the dissolution of Cr VI and total chromium in contaminated soil can effectively be reduced, and do not rebounded with the time, it can be used for the purposes such as roadbed brick, there is economic and environment-friendly feature.
Description
Technical field
The present invention relates to a kind of chromium-polluted soil curing agent and preparation method thereof, belong to technical field of soil remediation.
Background technology
Heavy metal pollution of soil refers to that due to mankind's activity content of the minor metallic element in soil in soil exceedes
Background value, too high levels caused by excess deposition, is referred to as heavy metal pollution of soil.And farmland soil heavy metals pollution have it is huge
Big harmfulness, heavy metal in soil pollution can not only cause crop production reduction and quality decline, can also pass through soil-plant
System, enters people's human body through food chain, is detrimental to health and life security.Heavy metal pollution of soil has the hysteresis of disguised harm
Property, chronicity and biological chain heavy metal biological concentration the features such as, heavy metal pollution of soil is recognized if these decide
The serious consequence for being difficult to expect will be brought with hysteresis is administered.
Chromium and compound is the industries such as metallurgy, plating, process hides, printing and dyeing in industrial every field extensive use
Essential raw material, thereby produce the soil of substantial amounts of pollution of chromium.The toxicity of chromium is endangered essentially from Cr VI to human body
Evil is very big, is one of internationally recognized three kinds of carcinogenic metal objects.
In existing chromium-polluted soil reparation or method of disposal, after people's main target of interest at present makes disposal
The leaching of chromium-polluted soil chromium is reduced to the index of people's requirement, namely is allowed to environmental sound, and chromium-polluted soil is realized
Research in terms of recycling is also seldom.
The content of the invention
An object of the present invention, it is to provide a kind of chromium-polluted soil curing agent.The curing agent of the present invention not only has good
Good gelling, also has reproducibility concurrently, the soil after solidification has certain intensity, can effectively reduce sexavalence in contaminated soil
The dissolution of chromium and total chromium, and do not rebounded with the time, it can be used for the purposes such as roadbed brick, there is economic and environment-friendly feature.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of chromium-polluted soil curing agent, by following weight
The raw material of number is made：Calcium hydroxy phosphate 30-50 parts, polyethyleneimine surface modification infusorial earth 30-40 parts, palmitic acid 20-30
Part, zeolite 10-20 parts, metakaolin 10-20 parts, flyash 5-15 parts, sodium tripolyphosphate 5-15 parts, ferrous sulfate 4-12 parts,
Alkali-activator 6-12 parts and slag 20-30 parts.
The present invention principle be：
The chromium-polluted soil soil-solidified-agent of the present invention, electronation is risen simultaneously to chromium-polluted soil and chemosetting is made
With.Wherein, it is a kind of new binder materials that metakaolin, slag and alkali-activator, which react and to form geo-polymer, is made
Zinc fractions have the adhesive bond of intensity, filling soil intergranular space, soil particle are wrapped up, and closure ion oozes out logical
Road, its intensity is assigned, and geo-polymer can also effectively fix the heavy metal ion such as chromium for firm cagelike structure；Containing Asia in slag
The reducing substanceses such as iron, sulfide, lasting reduction is played, is not easily runed off in soil；Ferrous sulfate is in the basic conditions
Also there is stronger reducing power, there is preferable reduction to the Cr VI in soil；Each component is made jointly in curing agent
With effectively reducing the dissolution of Cr VI and total chromium in soil, while assign its higher mechanical strength.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement.
Further, it is made up of the raw material of following parts by weight：40 parts of calcium hydroxy phosphate, polyethyleneimine surface are modified diatom
35 parts of soil, 25 parts of palmitic acid, 15 parts of zeolite, 15 parts of metakaolin, 10 parts of flyash, 10 parts of sodium tripolyphosphate, ferrous sulfate 8
25 parts of part, 9 parts of alkali-activator and slag.
Further, the mesh number of the calcium hydroxy phosphate is 500 mesh.
Further, the alkali-activator is one in sodium hydroxide, potassium hydroxide, quick dissolved sodium silicate and instant potassium silicate
Kind.
Further, the slag is converter slag or electric furnace slag, Blain specific surface 400-500m2/Kg。
The second object of the present invention, it is to put on the preparation method for stating chromium-polluted soil curing agent.The preparation method of the present invention
Simply, wide market, it is adapted to large-scale production.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of preparation method of chromium-polluted soil curing agent,
Comprise the following steps：
Take the raw material of following parts by weight：Calcium hydroxy phosphate 30-50 parts, polyethyleneimine surface modification infusorial earth 30-40
Part, palmitic acid 20-30 parts, zeolite 10-20 parts, metakaolin 10-20 parts, flyash 5-15 parts, sodium tripolyphosphate 5-15 parts, sulphur
Acid ferrous 4-12 parts, alkali-activator 6-12 parts and slag 20-30 parts, after being well mixed, grinding to Blain specific surface 360-
400m2/ Kg, produce the chromium-polluted soil curing agent.
When the chromium-polluted soil curing agent of the present invention is applied to chromium-polluted soil disposal, 30% can be directly filled in soil
Left and right, after stirring, carry out spreading out and putting on compacting, be allowed to consolidate in a short time, or fragment of brick is made in pressurization.
The beneficial effects of the invention are as follows：
(1) curing agent of the invention not only has good gelling, also has reproducibility concurrently, and the soil after solidification has one
Fixed intensity, the dissolution of Cr VI and total chromium in contaminated soil can be effectively reduced, and not rebounded with the time, can be used for
The purposes such as roadbed brick, there is economic and environment-friendly feature.
(2) each component of chromium-polluted soil fixative of the invention is commercial goods or industrial residue, cost of manufacture phase
To relatively low.
(3) preparation method of the invention is simple, wide market, is adapted to large-scale production.
Embodiment
The principle and feature of the present invention are described below in conjunction with specific embodiment, example is served only for explaining this hair
It is bright, it is not intended to limit the scope of the present invention.
Embodiment 1：
The chromium-polluted soil curing agent of the present embodiment, is made up of the raw material of following weight：Mesh number is the di of 500 mesh
Calcium 30kg, polyethyleneimine surface modification infusorial earth 40kg, palmitic acid 20kg, zeolite 20kg, metakaolin 10kg, flyash
15kg, sodium tripolyphosphate 5kg, ferrous sulfate 12kg, sodium hydroxide 6kg and slag 30kg.
The preparation method of above-mentioned chromium-polluted soil curing agent, comprises the following steps：
Take the raw material of following weight：Hydroxyl calcium hydroxy phosphate 30kg, polyethyleneimine surface modification infusorial earth 40kg, palmitic acid
20kg, zeolite 20kg, metakaolin 10kg, flyash 15kg, sodium tripolyphosphate 5kg, ferrous sulfate 12kg, alkali-activator 6kg
With slag 30kg, after being well mixed, grinding to Blain specific surface 360m2/ Kg, produce the chromium-polluted soil curing agent.
Embodiment 2：
The chromium-polluted soil curing agent of the present embodiment, is made up of the raw material of following weight：Mesh number is the di of 500 mesh
Calcium 40kg, polyethyleneimine surface modification infusorial earth 35kg, palmitic acid 25kg, zeolite 15kg, metakaolin 15kg, flyash
10kg, sodium tripolyphosphate 10kg, ferrous sulfate 8kg, potassium hydroxide 9kg and slag 25kg.
The preparation method of above-mentioned chromium-polluted soil curing agent, comprises the following steps：
Take the raw material of following weight：Hydroxyl calcium hydroxy phosphate 40kg, polyethyleneimine surface modification infusorial earth 35kg, palmitic acid
25kg, zeolite 15kg, metakaolin 15kg, flyash 10kg, sodium tripolyphosphate 10kg, ferrous sulfate 8kg, alkali-activator 9kg
With slag 25kg, after being well mixed, grinding to Blain specific surface 380m2/ Kg, produce the chromium-polluted soil curing agent.
Embodiment 3：
The chromium-polluted soil curing agent of the present embodiment, is made up of the raw material of following weight：Mesh number is the di of 500 mesh
Calcium 50kg, polyethyleneimine surface modification infusorial earth 30kg, palmitic acid 30kg, zeolite 10kg, metakaolin 20kg, flyash
5kg, sodium tripolyphosphate 15kg, ferrous sulfate 4kg, quick dissolved sodium silicate 12kg and slag 20kg.
The preparation method of above-mentioned chromium-polluted soil curing agent, comprises the following steps：
Take the raw material of following weight：Calcium hydroxy phosphate 50kg, polyethyleneimine surface modification infusorial earth 30kg, palmitic acid
30kg, zeolite 10kg, metakaolin 20kg, flyash 5kg, sodium tripolyphosphate 15kg, ferrous sulfate 4kg, alkali-activator 12kg
With slag 20kg, after being well mixed, grinding to Blain specific surface 400m2/ Kg, produce the chromium-polluted soil curing agent.
Chromium-polluted soil curing agent obtained by embodiment 1-3 is used for chromium-polluted soil, it is specific as shown in table 1.Chromium used
Total chrome content is 16568mg/kg in contaminated soil, and curing agent volume is 30%, after stirring, with reference to T0843-2009
《Stabilized with inorganic binder material test specimen preparation method》Sample is suppressed, by T0805-1994《Stabilized with inorganic binder material is without side
Limit compressive strength test method》Ruggedness test is carried out, with reference to HJT300-2007《Solid waste-Leaching leaching method-vinegar
Acid buffering solwution method》Toxicity (total chromium and Cr VI) leaching test is carried out to the soil after stabilization, Cr VI leaching concentration is by mark
Quasi- GB7467-87《The measure diphenyl carbazide spectrophotometry of solid waste Cr VI》Measure, total chromium leaching concentration is by mark
Quasi- GB/T7466-1987《Potassium permanganate-diphenylcarbazide light splitting light method》Measure.
As seen from Table 1, the application effect of Special stabilizing agent for chromium polluted soil of the invention is good, 7 days of each embodiment and
28 days Cr VI leaching concentrations are respectively less than 0.47mg/l, and total chromium leaching concentration is respectively less than 0.58mg/l.And solidify after soil without
7 days up to more than 9.2MPa of confined compressive strength, up to more than 10.12MPa, its mechanical property meets that roadbed construction etc. is built within 28 days
The requirement on timber-used way.
The application effect of chromium-polluted soil curing agent obtained by the embodiment 1-3 of table 1
As can be seen here, curing agent of the invention not only has good gelling, also has reproducibility concurrently, the soil after solidification
With certain intensity, the dissolution of Cr VI and total chromium in contaminated soil can be effectively reduced, and not rebounded with the time, can
For purposes such as roadbed bricks, there is economic and environment-friendly feature.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (6)
1. a kind of chromium-polluted soil curing agent, it is characterised in that be made up of the raw material of following parts by weight：Calcium hydroxy phosphate 30-
50 parts, polyethyleneimine surface modification infusorial earth 30-40 parts, palmitic acid 20-30 parts, zeolite 10-20 parts, metakaolin 10-20
Part, flyash 5-15 parts, sodium tripolyphosphate 5-15 parts, ferrous sulfate 4-12 parts, alkali-activator 6-12 parts and slag 20-30 parts.
2. a kind of chromium-polluted soil curing agent according to claim 1, it is characterised in that by the raw material of following parts by weight
It is made：40 parts of calcium hydroxy phosphate, 35 parts of polyethyleneimine surface modification infusorial earth, 25 parts of palmitic acid, 15 parts of zeolite, metakaolin
25 parts of 15 parts, 10 parts of flyash, 10 parts of sodium tripolyphosphate, 8 parts of ferrous sulfate, 9 parts of alkali-activator and slag.
3. a kind of chromium-polluted soil curing agent according to claim 1 or 2, it is characterised in that the calcium hydroxy phosphate
Mesh number is 500 mesh.
4. a kind of chromium-polluted soil curing agent according to claim 1 or 2, it is characterised in that the alkali-activator is hydrogen
One kind in sodium oxide molybdena, potassium hydroxide, quick dissolved sodium silicate and instant potassium silicate.
5. a kind of chromium-polluted soil curing agent according to claim 1 or 2, it is characterised in that the slag is converter steel
Slag or electric furnace slag, Blain specific surface 400-500m2/Kg。
6. a kind of preparation method of chromium-polluted soil curing agent, it is characterised in that comprise the following steps：Take following parts by weight
Raw material：Calcium hydroxy phosphate 30-50 parts, polyethyleneimine surface modification infusorial earth 30-40 parts, palmitic acid 20-30 parts, zeolite 10-
20 parts, metakaolin 10-20 parts, flyash 5-15 parts, sodium tripolyphosphate 5-15 parts, ferrous sulfate 4-12 parts, alkali-activator 6-
12 parts and slag 20-30 parts, after being well mixed, grinding to Blain specific surface 360-400m2/ Kg, produce the pollution of chromium soil
Earth curing agent.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109226239A (en) * | 2018-10-14 | 2019-01-18 | 中国计量大学 | A method of chromium-polluted soil is repaired using alkaline coal ash |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102295933A (en) * | 2011-07-01 | 2011-12-28 | 浙江大学 | Special stabilizing agent for chromium polluted soil |
| CN102585834A (en) * | 2012-01-19 | 2012-07-18 | 浙江大学 | Solidifying agent for treating chromium-polluted soil |
| CN104479685A (en) * | 2014-12-05 | 2015-04-01 | 上海宝冶钢渣综合开发实业有限公司 | Compound heavy metal solidifying agent for governing contaminated soil and preparation method thereof |
| CN106433657A (en) * | 2016-08-25 | 2017-02-22 | 惠安华晨贸易有限公司 | Chromium-contaminated soil remediation agent and preparation method thereof |
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2017
- 2017-08-23 CN CN201710730434.0A patent/CN107586067A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102295933A (en) * | 2011-07-01 | 2011-12-28 | 浙江大学 | Special stabilizing agent for chromium polluted soil |
| CN102585834A (en) * | 2012-01-19 | 2012-07-18 | 浙江大学 | Solidifying agent for treating chromium-polluted soil |
| CN104479685A (en) * | 2014-12-05 | 2015-04-01 | 上海宝冶钢渣综合开发实业有限公司 | Compound heavy metal solidifying agent for governing contaminated soil and preparation method thereof |
| CN106433657A (en) * | 2016-08-25 | 2017-02-22 | 惠安华晨贸易有限公司 | Chromium-contaminated soil remediation agent and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109226239A (en) * | 2018-10-14 | 2019-01-18 | 中国计量大学 | A method of chromium-polluted soil is repaired using alkaline coal ash |
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