CN102585834B - Solidifying agent for treating chromium-polluted soil - Google Patents
Solidifying agent for treating chromium-polluted soil Download PDFInfo
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- CN102585834B CN102585834B CN201210016708.7A CN201210016708A CN102585834B CN 102585834 B CN102585834 B CN 102585834B CN 201210016708 A CN201210016708 A CN 201210016708A CN 102585834 B CN102585834 B CN 102585834B
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Abstract
The invention discloses a solidifying agent for treating chromium-polluted soil, which comprises the following raw materials by weight: 40-65% of ground mineral slag, 10-20% of ground steel slag, 10-20% of meta-kaolin, 15-25% of an alkali-activator, 0-10% of pulverized coal ash, and 0-3% of ferrous chloride, wherein the free water contents of the raw materials are all not higher than 2%, and the above components are proportionally configured and uniformly mixed in a grinding machine. The product disclosed by the invention is used for solidifying chromium-polluted soil, and has both reducing property and gel property; and the dissolution rate of chromium in the solidified body is low and does not rebound with time, while the solidified body has high strength and good water resistance, and can be used for brickmaking and other building material purposes.
Description
Technical field
The present invention relates to environmental technology field, be specifically related to a kind of solidifying agent for the treatment of chromium-polluted soil.
Background technology
Chromium and compound, in industrial every field widespread use, is the requisite starting material of industry such as metallurgy, plating, process hides, printing and dyeing, has produced thus the soil of a large amount of pollutions of chromium.The toxicity of chromium is mainly from sexavalent chrome, very big to harm, is one of internationally recognized three kinds of carcinogenic metal objects.Chromium-polluted soil is disposed or repaired, and is the key subjects of environment protection.
In chromium-polluted soil, sexavalent chrome does not exist only in the surface of soil particle, also be present in the inside of particle simultaneously, between the sexavalent chrome of soil particle inside and treatment media, have the problem of a loose contact, thereby the disposal of chromium-polluted soil be more much more difficult than the disposal of pollution of chromium liquid.
In chromium-polluted soil reparation and improvement method, chemical reduction and chemosetting are two kinds of conventional methods wherein.
Chemical reduction method is trivalent chromium by hexavalent chrome reduction, reduce the transport property of chromium in environment, thereby reduce the harm of pollution of chromium, but the sexavalent chrome of soil inside is difficult to effectively contact generation reduction reaction with reductive agent, and excess reductive agent is easy to be flushed away or by other substance oxidation, chromic stripping in contaminated soil is rebounded in time.Therefore, simple applied chemistry reduction method is disposed chromium-polluted soil and is difficult to the effect that reaches desirable.
Chemosetting is to wrap up by gelling material by polluting body, is fixed in solid structure, thereby controls the dangerous technology that diffusion occurs waste of polluting after cementitious material to solidify.The key of chemosetting method is solidifying agent, is generally at present traditional building latex material, as lime, ordinary Portland cement, pitch etc., sometimes also adds part flyash, slag etc.Cementitious material to solidify chromium-polluted soil, can make soil obtain certain intensity, and corresponding hydrated product has parcel soil particle, filling pore and obstruction seepage channel, and the multiple action such as adsorbing hexavalent chromium, thereby reduces the stripping of Chromium in Soil ion.Geopolymer is a kind of novel gelled material, and because it has good intensity and impermeability etc., its solidification effect is often good than traditional gelling material, also can be used as the solidifying agent material of chromium-polluted soil, but the research of this respect is less.Although gelling material has good solidification to many pollution bodies,, for chromium-polluted soil, because sexavalent chrome is large to the harm of environment, very strict to its control, single with cementitious material to solidify, be conventionally difficult to reach people to the solidification effect requiring.
In existing chromium-polluted soil reparation or method of disposal, current the paid close attention to major objective of people is to make the leaching of the chromium-polluted soil chromium after disposal be reduced to the index that people require, also make it environmental sound, and the research that chromium-polluted soil is realized to recycling aspect also seldom.
Applicant has carried out more research in this respect, discloses a kind of Special stabilizing agent for chromium polluted soil, its composition material and part by weight: Portland clinker 30-60% in the patent of invention that application number is 201110182919.3; Slag 30-60%; Iron protochloride 2-5%; Zeolite 1-8%; Solid water glass 1-3%; Water reducer 0-0.5%, raw material weight per-cent sum is 100%, the free water of each raw material is not higher than 2%.This stablizer can effectively reduce sexavalent chrome and the always stripping of chromium in contaminated soil, and the resistance of soil after stablizing is high.But this stablizer adopts the Portland clinker obtaining by high-temperature calcination as one of main ingredient, and industrial residue consumption is lower.Therefore, further exploitation is curing good with stabilization effect, and silicate cement clinker, can not used solidifying with stabilized preparations of a large amount of industrial residues still significant.
Summary of the invention
The invention provides a kind of solidifying agent for the treatment of chromium-polluted soil, reached the harmless treatment of chromium-polluted soil and recycling simultaneously, this solidifying agent not only has good gelling, also have reductibility concurrently, the soil after solidifying has certain intensity, and the stripping of sexavalent chrome and total chromium is very low, can be for purposes such as roadbed bricks, the a large amount of industrial solid castoff of this solidifying agent utilization is raw material, as slag, slag etc., thereby has economic environmental protection feature.
A kind of solidifying agent for the treatment of chromium-polluted soil, by weight percentage, raw material comprises: ground slag 40-65%, ground steel slag 10-20%, metakaolin 10-20%, alkali-activator 15-25%, flyash 0-10%, iron protochloride 0-3%, total amount is 100%, each raw material free water content is not higher than 2%.
Preferably, described ground slag is 42-50%; Described flyash is 5-8%; Described iron protochloride is 1-2%.
Described alkali-activator is at least one in sodium hydroxide, potassium hydroxide, quick dissolved sodium silicate and instant potassium silicate.
Described ground slag is that iron work produces when the blast-furnace smelting pig iron that byproduct is levigate to be formed, meet GB/T 18046-2008 requirement, levigate the forming of byproduct that described ground steel slag produces while being bessemer furnace slag or electrosmelting iron and steel, meets GB/T 20491-2006 requirement.Both main chemical compositions are CaO, SiO
2, Al
2o
3, Fe
2o
3, MgO, FeO, MnO and some sulfide etc.Ground slag, ground steel slag all can adopt commercially available prod.，
Described metakaolin be kaolin through optimal temperature calcined dehydration and levigate forming, its main component is anhydrous aluminium silicate.
Described flyash be coal after boiler combustion, form by the thin ash of flue gas band flake hearth-tapping, its main chemical compositions is CaO, SiO
2, Al
2o
3, Fe
2o
3, TiO
2, described flyash meets GB1596-2005 requirement.
Metakaolin, ground slag, ground steel slag and alkali-activator react and form geopolymer is a kind of novel gelling material, make soil be formed with the adhesive bond of intensity, filling soil intergranular space, soil particle is wrapped up, shutoff ion oozes out passage, give its intensity, and geopolymer is the effectively fixedly heavy metal ion such as chromium of firm cagelike structure; In ground steel slag and ground slag, containing ferrous, the reducing substanceses such as sulfide, play lasting reductive action, are difficult for running off in soil; Iron protochloride also has stronger reducing power under alkaline condition, and the sexavalent chrome in soil is had to good reductive action; Each component acting in conjunction in solidifying agent, effectively reduces sexavalent chrome and the always stripping of chromium in soil, gives its higher mechanical strength simultaneously.
The raw material of chromium-polluted soil solidifying agent of the present invention is commercially available prod or industrial residue, and preparation method is for to configure each component in proportion and to mix in grinding machine.
Solidifying agent of the present invention is applied to chromium-polluted soil while disposing, and directly admixture 40% (weight percent) left and right in soil, after stirring, spread out and put on compacting, makes it fixed in a short time, or adds and be pressed into fragment of brick.
Beneficial effect of the present invention:
Each component of solidifying agent of the present invention is commercial goods or industrial residue, and cost of manufacture is relatively low; While processing for chromium-polluted soil, do not need chromium-polluted soil to reduce in advance processing, treatment process is simple; Solidifying agent has reductibility and gelling concurrently, and not only in cured body, the stripping of chromium is low, does not rebound in time, and cured body intensity is high, water resistance is good, can, for building materials purposes such as brickmaking, reach the harmless treatment of chromium-polluted soil and recycling simultaneously.
Embodiment
Table 1 is one group of the present invention (8) embodiment.Constitutive material and the weight percent thereof of each embodiment in table 1, have been listed.Constitutive material is ground slag, ground steel slag, metakaolin, flyash, iron protochloride, alkali-activator, and each constitutive material free water content is not higher than 2%, and weight percent sum is 100%.Ground slag, ground steel slag, flyash, alkali-activator are commercially available prod, ground slag meets GB/T 18046-2008 requirement, ground steel slag meets GB/T 20491-2006 requirement, and flyash meets GB1596-2005 requirement, and each raw material measures and mixes in grinding machine by proportioning.
In table 1, respectively implement each component and be commercial goods or industrial residue, and industrial residue large usage quantity, thereby cost of manufacture is relatively low, has economic environmental protection feature.
The Preparation Example of table 1 solidifying agent
Solidifying agent prepared by the various embodiments described above is for solidifying chromium-polluted soil, in chromium-polluted soil used, total chrome content is 15306mg/kg, solidifying agent volume is 40%, after stirring, with reference to T0843-2009 < < stabilized with inorganic binder material test specimen making method > > compacting sample, by T0805-1994 < < stabilized with inorganic binder material unconfined compressive strenght test method > >, carry out ruggedness test, with reference to HJT 300-2007 < < solid waste-Leaching leaching method-hac buffer method > >, the soil after stable is carried out to toxicity (total chromium and sexavalent chrome) leaching test, result is as shown in table 2, in table 2, soil Cr-VI leaching concentration is pressed the chromic mensuration diphenyl carbazide spectrophotometry of GB 7467-87 < < solid waste > > mensuration, total chromium leaching concentration is measured by standard GB/T 7466-1987 < < potassium permanganate-diphenylcarbazide light splitting light method > >.
As seen from Table 2, the effect of solidifying agent of the present invention is good, and 7 days of each embodiment and 28 days sexavalent chrome leaching concentrations are not more than respectively 0.2mg/l and 0.03mg/l, and total chromium leaching concentration is all less than 0.50mg/l.28 days sexavalent chrome leaching concentrations of above sample are all far below the 5mg/L stipulating in GB5085.3-2007 danger wastes judging standard-leaching characteristic identification, 0.5mg/L lower than GB8978-1996 integrated wastewater discharge standard regulation, is less than GB/T14848-1993 groundwater quality V class water quality standard 0.1mg/L.And soil unconfined compression strength after solidifying 7 days is up to more than 13.2MPa, within 28 days, up to more than 22.0MPa, its mechanical property meets the requirement of the building materials purposes such as roadbed construction.
The effect of the solidifying agent of each embodiment in table 2 table 1
Claims (7)
1. the solidifying agent for the treatment of chromium-polluted soil, it is characterized in that, by weight percentage, raw material comprises: ground slag 40-65%, ground steel slag 10-20%, metakaolin 10-20%, alkali-activator 15-25%, flyash 0-10%, iron protochloride 0-3%, each raw material free water content is not higher than 2%; Described alkali-activator is at least one in sodium hydroxide, potassium hydroxide, quick dissolved sodium silicate and instant potassium silicate.
2. according to right, will remove the solidifying agent described in 1, it is characterized in that, described ground slag is 42-50%.
3. solidifying agent according to claim 1, is characterized in that, described flyash is 5-8%.
4. solidifying agent according to claim 1, is characterized in that, described iron protochloride is 1-2%.
5. solidifying agent according to claim 1, is characterized in that, described ground slag meets GB/T18046-2008 requirement.
6. solidifying agent according to claim 1, is characterized in that, described ground steel slag meets GB/T20491-2006 requirement.
7. solidifying agent according to claim 1, is characterized in that, described flyash meets GB1596-2005 requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210016708.7A CN102585834B (en) | 2012-01-19 | 2012-01-19 | Solidifying agent for treating chromium-polluted soil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210016708.7A CN102585834B (en) | 2012-01-19 | 2012-01-19 | Solidifying agent for treating chromium-polluted soil |
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| CN102585834B true CN102585834B (en) | 2014-02-19 |
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| CN103373843A (en) * | 2013-07-01 | 2013-10-30 | 河海大学 | Slag-based solidified soil and preparation method thereof |
| CN104399741A (en) * | 2014-10-22 | 2015-03-11 | 华南农业大学 | Method for fixing soil heavy metals so as to protect groundwater |
| CN106186983B (en) * | 2016-07-14 | 2017-12-05 | 山东科技大学 | A kind of handling process of the sediment containing chromium |
| CN106966621B (en) * | 2017-02-23 | 2019-10-11 | 浙江大学 | A kind of method that electroplating sludge prepares baking-free ceramicite |
| CN107586067A (en) * | 2017-08-23 | 2018-01-16 | 侯玉德 | A kind of chromium-polluted soil curing agent and preparation method thereof |
| CN107603634A (en) * | 2017-09-12 | 2018-01-19 | 苏愉 | A kind of chromium-polluted soil curing agent and preparation method thereof |
| CN107815314A (en) * | 2017-10-20 | 2018-03-20 | 桂林市春晓环保科技有限公司 | A kind of chromium-polluted soil renovation agent and preparation method thereof |
| CN107721255A (en) * | 2017-10-20 | 2018-02-23 | 桂林市春晓环保科技有限公司 | A kind of chromium-polluted soil curing agent and preparation method thereof |
| CN109289726B (en) * | 2018-11-19 | 2021-02-05 | 大连青松智慧生态科技有限公司 | Method for solidifying severely polluted liquid |
| CN109502937B (en) * | 2018-12-07 | 2022-04-12 | 西南科技大学 | Method for solidifying sludge and sludge solidifying agent utilizing titanium extraction slag |
| CN109777424A (en) * | 2019-01-10 | 2019-05-21 | 昆明理工大学 | A kind of preparation method for the stabilizer being passivated heavy metal in soil |
| CN109943340A (en) * | 2019-05-13 | 2019-06-28 | 河南川萍环保科技有限公司 | For administering the passivator and its preparation and application of high arsenic waste residue |
| CN110511760A (en) * | 2019-09-05 | 2019-11-29 | 北京沐源华泽环境工程有限公司 | The method for reducing the complex repairation agent of heavy metal in soil leaching concentration and carrying out soil remediation with the renovation agent |
| CN113102477A (en) * | 2021-03-16 | 2021-07-13 | 江苏亿金环保科技有限公司 | Treatment method of chromium-polluted soil |
| CN113185202A (en) * | 2021-05-27 | 2021-07-30 | 昆明冶金研究院有限公司 | Method for solidifying arsenic by using steel slag-metakaolin-based multi-element solid waste geopolymer |
| CN113214835A (en) * | 2021-06-16 | 2021-08-06 | 中国电建集团华东勘测设计研究院有限公司 | Soil curing agent for roadbed filling |
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| CN101456708B (en) * | 2009-01-06 | 2011-02-23 | 中建商品混凝土有限公司 | Lightweight aggregate and preparation method thereof |
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