CN103894402A - Hexavalent chromium-containing soil purification method - Google Patents
Hexavalent chromium-containing soil purification method Download PDFInfo
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- CN103894402A CN103894402A CN201210580065.9A CN201210580065A CN103894402A CN 103894402 A CN103894402 A CN 103894402A CN 201210580065 A CN201210580065 A CN 201210580065A CN 103894402 A CN103894402 A CN 103894402A
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- soil
- processing
- hexavalent chromium
- milled processed
- decontamination
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Abstract
The invention discloses a hexavalent chromium-containing soil purification method, and belongs to the technical field of purification of contaminated soil. The purification method comprises the following steps: drying crushing and grinding hexavalent chromium contaminated soil; adding a sulfite to the grinded soil for first reduction; adding a sulfite to the firstly-reduced soil for secondary reduction and first curing; secondarily curing the secondarily-reduced and firstly-cured soil, aging the secondarily cured soil, placing under natural conditions for a period of time to obtain cleaner soil. By multi-time adding of a reducing agent and a curing agent in the hexavalent chromium-containing soil, the hexavalent chromium-containing soil is further turned into trivalent chromium-containing soil, other metals in the soil are degraded and cured, and the method has the advantages of simple operation, low cost, easiness to realize and better purification effect.
Description
Technical field
The present invention relates to contaminated soil purification techniques field, relate in particular to a kind of containing Cr VI method of soil decontamination.
Background technology
Along with developing by leaps and bounds of science and technology, incident is destruction to our living environment.Carry out for heavy metal especially high valence chrome (Cr VI) contaminated soil the unremitting pursue that purified treatment is many scientific and technical personnel and company, wherein, a kind of purifying treatment method for containing hexavalent chromium polluted soil is mainly that Cr VI is become to 3 valency chromium by chemical reaction.
In the prior art, application on November 26th, 2010, on May 30th, 2012 is open, application number is 201010560541.1, invention and created name is that the patent of invention of " a kind of containing Cr VI soil remediation processing method of reducing " discloses the purifying treatment method of a kind of processing containing hexavalent chromium polluted soil, and foregoing invention employing is drawn water dry containing Cr VI soil, and the Cr VI in processing water sweetening of the soil makes it to become trivalent chromium, water qualified discharge, recovers ecosystem containing chromium soil; Fixing ditch outward in scope containing chromium soil scope, in ditch, dam water proof is built with ripe moulded pottery not yet put in a kiln to bake in outside, inside ditch, adds sand, buries filter pipe in sand, then fills and leads up ditch with clean earth; In suction filtration water pipe, water is processed, and the Cr VI that adopts the Detoxicating liquid medicine of sulfate or sulphite making to process in water becomes trivalent chromium, through precipitation processed, and water qualified discharge, dehydrate remakes refuse processing; Simultaneously, within the scope of filter pipe, arrange trench digging and connect drainage pipeline drainage, ted dry earth, the detoxicating liquid that adopts again sulfate or sulphite to make soaks into, and the Cr VI soaking in reaction earth becomes trivalent chromium, and is neutral, lattice is separated backfill again, the detection of fetching earth until continue to draw water after all completing, meets standard-required, and earthing uses or directly uses.Said method can not fully effectively purify the chromium pollutant that contains in soil,, other metal pollutants is not also effectively processed meanwhile.
Summary of the invention
In order to solve the problems of the technologies described above, the object of this invention is to provide a kind of fully effective method for containing Cr VI soil sanitation, some other metal is also had to purifying and solidifying effect simultaneously.
The object of the invention is to realize by technical scheme once:
A kind of containing Cr VI method of soil decontamination, its step is as follows: step 1, and by being subject to, hexavalent chromium polluted soil is dried, milled processed, need to carry out break process if soil is formed bulk, so that grind; Step 2, reduces processing for the soil after grinding for the first time by adding sulphite; Step 3, for reduce for the first time process soil by add sulphurizing salt reduce for the second time process and for the first time solidify process; Step 4, solidifies processing for the second time for reducing for the second time to process and solidify for the first time the soil of processing.In order more effectively to reduce and to solidify, can also increase step 5, carry out maturation process for solidifying for the second time the soil of processing, and place under field conditions (factors) the soil that can more be purified after after a while.
By technique scheme of the present invention, by containing repeatedly adding reducing agent and curing agent in Cr VI soil, further Cr VI soil is become to trivalent chromium soil, and effectively degrade and solidified other metals in soil, the method is simple to operate, cost is low, be easy to realize and also clean-up effect relatively good.
Brief description of the drawings
Fig. 1 is that one of the present invention is containing Cr VI method of soil decontamination flow chart.
Detailed description of the invention
Below in conjunction with accompanying drawing, be elaborated for the specific embodiment of the present invention:
As shown in Figure 1, a kind of containing Cr VI method of soil decontamination, comprise the steps:
Step 1, to being dried and milled processed containing hexavalent chromium polluted soil, the soil particle after milled processed is 70-130 order.To dig out containing hexavalent chromium polluted soil, and be dried processing.Use common ball mill to carry out milled processed.If soil block before carrying out milled processed, should carry out break process very greatly.Break process can be used common crushing mechanism to carry out.The object of milled processed is chromate crystal structure in the colloform texture of polymerism in spoiled soil and residual chromium slag, has increased specific area, for follow-up half-dried reduction mutually, curing reaction and treatment step lay the foundation.
Step 2, at normal temperatures, in the soil of crossing through step 1 milled processed, add sulfite solution and reduce processing, described sulphite reductant solution addition is 1.5 times of theoretical consumptions, in described sulfite solution, the solid-liquid mass ratio of solute and solvent is 1: 1 to 1: 4, the preferred sodium sulfite of sulphite, solvent is water.Selecting sodium sulfite (is Na
2sO
3) as reducing agent, mainly consider that it can use and not change alkaline environment at alkali condition, and under normal temperature condition, carry out reaching the object of reduction and detoxication effect, low for equipment requirement like this, material cost also has remarkable reduction.The concrete chemical equation of this step is as follows:
2CrO
4 2-+3SO
3 2-+10H
+→Cr
3++3SO
4 2-+5H
2O
Through reduction reaction, Cr VI has become 3 valency chromium.
Step 3, at normal temperatures, reduces simultaneously and solidifies processing adding sulphurizing salt solution in step 2 is reduced the soil of processing, and described sulphurizing salt addition is 1.5 times of theoretical consumptions.Described sulphurizing salt solution concentration is 2mol/L.Preferably vulcanized sodium (is Na
2s) as reduction curing agent.
With reducing agent/curing agent (Na
2s) polluted soil of above-mentioned reduction being processed reduces/solidifies processing.Can continue to reduce on the one hand Cr
6+for Cr
3+, ensure to react and carry out more fully completely; On the other hand, to other heavy metal ion that may exist in soil, as Zn
2+, Cd
2+deng being cured processing, guarantee that the soil after repairing reaches (national standard) requirement.The concrete chemical equation of this step is as follows:
2CrO
4 2-+S
2-+5H
2O→2Cr(OH)
3↓+SO
3 2-+4OH
-
2CrO
4 2-+3S
2-+8H
2O→2Cr(OH)
3↓+3S↓+10OH
-
Zn
2++S
2-→ZnS↓
Cd
2++S
2-→CdS↓
Step 4, at normal temperatures, process through step 3 reduction and solidify the soil of processing in add limewash and again solidify processing, described limewash addition is 1.2 to 1.5 times of theoretical consumptions, limewash concentration used is 0.5mol/L.To solidifying for the second time processing through reducing polluted soil after treatment, Cr3+ is converted into Cr (OH) completely with curing agent (limewash)
3precipitate and then solidify.This step, as further safeguard, is guaranteed the related request that the soil after repairing is up to state standards.The concrete chemical equation of this step is as follows:
Cr
3++3OH
-→Cr(OH)
3↓
Adopt two step reduction-curing process to repair chromium-polluted soil, ensure Cr
6+be reduced to Cr completely
3+, and be finally converted into Cr (OH)
3precipitate and solidify; Meanwhile, to other heavy metal ion that may exist in soil, as Zn
2+, Cd
2+deng being cured processing, guarantee the requirement that is up to state standards of soil after repairing.After repair process finishes, its toxicity significantly reduces, and meanwhile, is difficult for diffusion.
In order to make the chemical reaction in abovementioned steps more abundant, thorough, to ensure that reduction-solidify-curing reaction carries out completely.Purification method of the present invention can also comprise step 5, and the soil of processing by step 4 is placed in the maturation process of recovering to place a period of time under natural conditions, and described recovery placement a period of time refers at least 24 hours.
This purification method is applicable to chromyl soil, meanwhile, also has remarkable result for chromyl underground water purification.
The above; only for preferably detailed description of the invention of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (6)
1. containing a Cr VI method of soil decontamination, it is characterized in that, comprise the steps:
Step 1, to being dried and milled processed containing hexavalent chromium polluted soil, the soil particle after milled processed is 70-130 order;
Step 2, at normal temperatures, in the soil of crossing through step 1 milled processed, add sulfite solution and reduce processing, described sulphite reductant solution addition is 1.5 times of theoretical consumptions, and in described sulfite solution, the solid-liquid mass ratio of solute and solvent is 1: 1 to 1: 4;
Step 3, at normal temperatures, reduces simultaneously and solidifies processing adding sulphurizing salt solution in step 2 is reduced the soil of processing, and described sulphurizing salt addition is 1.5 times of theoretical consumptions, and described sulphurizing salt solution concentration is 2mol/L;
Step 4, at normal temperatures, process through step 3 reduction and solidify the soil of processing in add limewash and again solidify processing, described limewash addition is 1.2 to 1.5 times of theoretical consumptions, described limewash concentration is 0.5mo1/L.
2. one according to claim 1 is containing Cr VI method of soil decontamination, it is characterized in that, also comprise the steps: step 5, the soil that step 4 was processed is placed in the maturation process of recovering to place a period of time under natural conditions, and described recovery placement a period of time refers at least 24 hours.
3. one according to claim 1, containing Cr VI method of soil decontamination, is characterized in that, in described step 1, also comprises the steps:
Soil for caking also comprises break process step.
4. one according to claim 1, containing Cr VI method of soil decontamination, is characterized in that, the milled processed in described step 1 adopts ball mill to carry out milled processed, and described ball mill is general milling machine.
5. one according to claim 1, containing Cr VI method of soil decontamination, is characterized in that, described sulphite is sodium sulfite.
6. one according to claim 1, containing Cr VI method of soil decontamination, is characterized in that, described sulphurizing salt is vulcanized sodium.
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| CN201210580065.9A CN103894402A (en) | 2012-12-28 | 2012-12-28 | Hexavalent chromium-containing soil purification method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210580065.9A CN103894402A (en) | 2012-12-28 | 2012-12-28 | Hexavalent chromium-containing soil purification method |
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| CN103894402A true CN103894402A (en) | 2014-07-02 |
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| CN201210580065.9A Pending CN103894402A (en) | 2012-12-28 | 2012-12-28 | Hexavalent chromium-containing soil purification method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104138895A (en) * | 2013-05-09 | 2014-11-12 | 苏州中科慧盛生物科技有限公司 | Hexavalent chromium-containing soil purifying method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5304710A (en) * | 1993-02-18 | 1994-04-19 | Envar Services, Inc. | Method of detoxification and stabilization of soils contaminated with chromium ore waste |
| CN101708501A (en) * | 2009-12-02 | 2010-05-19 | 中国环境科学研究院 | Two-stage countercurrent washing medicament addition stabilization combined restoration method of chromium polluted soil |
| CN101862749A (en) * | 2009-04-14 | 2010-10-20 | 刘杰 | Repairing method of soil polluted by chromium residue |
| CN102228901A (en) * | 2010-06-11 | 2011-11-02 | 中国地质大学（北京） | Treatment method of chromium-polluted soil |
| CN102303041A (en) * | 2011-05-16 | 2012-01-04 | 刘阳生 | Composite heavy metal polluted soil in-situ fixing method |
-
2012
- 2012-12-28 CN CN201210580065.9A patent/CN103894402A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5304710A (en) * | 1993-02-18 | 1994-04-19 | Envar Services, Inc. | Method of detoxification and stabilization of soils contaminated with chromium ore waste |
| CN101862749A (en) * | 2009-04-14 | 2010-10-20 | 刘杰 | Repairing method of soil polluted by chromium residue |
| CN101708501A (en) * | 2009-12-02 | 2010-05-19 | 中国环境科学研究院 | Two-stage countercurrent washing medicament addition stabilization combined restoration method of chromium polluted soil |
| CN102228901A (en) * | 2010-06-11 | 2011-11-02 | 中国地质大学（北京） | Treatment method of chromium-polluted soil |
| CN102303041A (en) * | 2011-05-16 | 2012-01-04 | 刘阳生 | Composite heavy metal polluted soil in-situ fixing method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104138895A (en) * | 2013-05-09 | 2014-11-12 | 苏州中科慧盛生物科技有限公司 | Hexavalent chromium-containing soil purifying method |
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Address after: Suzhou City, Jiangsu province 215000 Wuzhong Road No. 1368 east of Taihu science and Technology City 7 building A building in Suzhou Hui Sheng Department of biological science and Technology Co Ltd Applicant after: SUZHOU ZHONGKE HUISHENG BIOTECHNOLOGY CO., LTD. Address before: Wuzhong District Mudu town Jinfeng Road, Suzhou city Jiangsu province 215000 No. 216 (East Technology Park building B1, Room 401) Applicant before: SUZHOU ZHONGKE HUISHENG BIOTECHNOLOGY CO., LTD. |
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Application publication date: 20140702 |