CN101614723A - The evaluation method of the performance of magnesium oxide that makes heavy metals insoluble - Google Patents
The evaluation method of the performance of magnesium oxide that makes heavy metals insoluble Download PDFInfo
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- CN101614723A CN101614723A CN200810212623A CN200810212623A CN101614723A CN 101614723 A CN101614723 A CN 101614723A CN 200810212623 A CN200810212623 A CN 200810212623A CN 200810212623 A CN200810212623 A CN 200810212623A CN 101614723 A CN101614723 A CN 101614723A
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Abstract
The invention provides the evaluation method of the performance of magnesium oxide that makes heavy metals insoluble, this method is not used contaminated soil and can be easily at short notice the performance as the various magnesium oxide that makes heavy metals insolubles of the heavy metal stripping depressant in the contaminated soil be estimated.The evaluation method of the performance of described magnesium oxide that makes heavy metals insoluble comprises following operation: (A) will contain the compound of 6 valency chromium and magnesium oxide and mix with water as solvent and stir, thereby obtain the operation of slurry; (B) slurry that obtains is carried out Separation of Solid and Liquid, obtain comprising the liquid component of the 6 valency chromium ions that are derived from the described compound that contains 6 valency chromium of part and comprise be derived from remainder described contain 6 valency chromium compound 6 valency chromium and be derived from the operation of the solid constituent of magnesian magnesium hydroxide; And (C) concentration of 6 valency chromium ions in the liquid component that obtains is measured, with the operation that the performance of magnesium oxide that makes heavy metals insoluble is estimated.
Description
Technical field
The present invention relates to be used for method that the performance of magnesium oxide that makes heavy metals insoluble is estimated, heavy metal such as the lead that described magnesium oxide is used for contaminated soil is contained, cadmium, 6 valency chromium is insoluble.
Background technology
The past people just know the material of use magnesium oxide as soil hardening agent or heavy metal stripping depressant.
For example, there is document to propose the soil hardening agent that constitutes by magnesium oxide and/or magnesium sulphate, or the soil hardening agent (patent documentation 1) that constitutes by the material that contains magnesium oxide and/or magnesium sulphate.
And, also have document to propose the method (patent documentation 2) of the following strippings such as heavy metal that prevent contaminated soil: the method is characterized in that, the contaminated soil by pollutions such as heavy metals of prescribed depth is made the earth shape, what inject in above-mentioned earth shape contaminated soil that magnesium oxide by quantitative water of hybrid regulatory and ormal weight forms is the soil hardening agent of principal ingredient with magnesium oxide, this rigidizer and above-mentioned soil are mixed, the magnesium oxide of the described rigidizer that injects reacts and makes described soil hardening, thereby can prevent that described heavy metal stripping is in the soil adjacent with described soil.
Patent documentation 1: Japanese kokai publication hei 10-316967 communique
Patent documentation 2: TOHKEMY 2002-206090 communique
As magnesium oxide, usually use magnesium carbonate or magnesium hydroxide are fired and the magnesium oxide that obtains.In this case, magnesian proterties according to the kind of the impurity that firing temperature, raw material type, raw material contained with the different of amount etc. and change.
Make the resulting experience of various magnesium oxide according to the inventor by changing firing temperature,, also include the magnesium oxide that makes the insoluble poor-performing of heavy metal in the resulting magnesium oxide even fire 800 ℃～1100 ℃ temperature.Therefore, in order to improve magnesian quality stability, need find out the magnesium oxide that these make the insoluble poor-performing of heavy metal, and before making product, be removed as heavy metal stripping depressant.At this moment, hope can be at short notice easily and in fact do not use under the condition of contaminated soil the performance of magnesium oxide that makes heavy metals insoluble is estimated.
About this point, although in above-mentioned patent documentation 1,2, magnesian use is put down in writing, about estimate the content that magnesian quality is whether good and select, but not record fully from the aspect that reduces performances such as heavy metal stripping.
So, the object of the present invention is to provide a kind of method, this method is not used contaminated soil, and can be at short notice easily to being used for hardening contaminated soil and estimate as the performance of the various magnesium oxide that makes heavy metals insolubles of the heavy metal stripping depressant of contaminated soil.
Summary of the invention
The inventor furthers investigate in order to solve above-mentioned problem, found that, to contain the compound of 6 valency chromium and magnesium oxide mixes with water as solvent and stirs, after obtaining slurry, this slurry is carried out Separation of Solid and Liquid, then the concentration of the 6 valency chromium ions that exist in the liquid component that obtains is measured, thus can be to carrying out quantitatively with being derived from the 6 insoluble valency chromium that magnesian magnesium hydroxide constitutes solid constituent, and the amount of the 6 valency chromium that this is insoluble is many more, the performance that just can be evaluated as magnesium oxide that makes heavy metals insoluble is high more, has finished the present invention based on above-mentioned discovery.
That is, the invention provides the technical scheme of following [1]～[7].
[1] a kind of evaluation method of performance of magnesium oxide that makes heavy metals insoluble, it is characterized in that this method comprises following operation: (A) mixed processes, in this operation, to contain the compound of 6 valency chromium and magnesium oxide and mix with water and stir, to obtain slurry as solvent; (B) solid-liquid separation process, in this operation, the slurry that obtains is carried out Separation of Solid and Liquid, obtain liquid component and solid constituent, described liquid component comprises and is derived from the described 6 valency chromium ions that contain the compound of 6 valency chromium of part, described solid constituent comprise be derived from remainder described contain 6 valency chromium compound 6 valency chromium and be derived from described magnesian magnesium hydroxide; And (C) estimate operation, in this operation, the concentration of 6 valency chromium ions in the liquid component that obtains is measured, to estimate the performance of described magnesium oxide that makes heavy metals insoluble.
[2] as the evaluation method of the performance of above-mentioned [1] described magnesium oxide that makes heavy metals insoluble, wherein, in operation (A), with respect to 1 liter of water as the solvent of described slurry, the described amount that contains the compound of 6 valency chromium is counted 0.75mg～10mg with the quality of 6 valency chromium.
[3] as the evaluation method of the performance of above-mentioned [1] or [2] described magnesium oxide that makes heavy metals insoluble, wherein, in operation (A), with respect to 1 liter of water as the solvent of described slurry, described magnesian amount is 3g～100g.
[4] as the evaluation method of the performance of each described magnesium oxide that makes heavy metals insoluble of above-mentioned [1]～[3], wherein, in operation (A), mixing time is more than 15 minutes.
[5] as the evaluation method of the performance of each described magnesium oxide that makes heavy metals insoluble of above-mentioned [1]～[4], wherein, it is below 0.03mg/ rises that the concentration conversion of the chloride ion in the slurry of operation (A) becomes the chlorine atom.
[6] as the evaluation method of the performance of each described magnesium oxide that makes heavy metals insoluble of above-mentioned [1]～[5], wherein, this method is except operation (A)～(C), also comprise sorting operation (D), in this operation (D), according to the evaluation result of operation (C), from two or more magnesium oxide, select and make the higher magnesium oxide of the insoluble performance of heavy metal.
[7] as the evaluation method of the performance of above-mentioned [6] described magnesium oxide that makes heavy metals insoluble, wherein, in operation (A), with respect to 1 liter of water as the solvent of described slurry, the described amount that contains the compound of 6 valency chromium is counted 1.0mg～2.0mg with the quality of 6 valency chromium, described magnesian amount is 10g～35g with respect to 1 liter of water as the solvent of described slurry, mixing time is 15 minutes～20 minutes, and, in operation (D), select and confirm the magnesium oxide that reclaims with the form of described solid constituent more than the 35 quality % of the total amount of 6 valency chromium in the described compound that contains 6 valency chromium.
According to the evaluation method of the performance of magnesium oxide that makes heavy metals insoluble of the present invention, (for example in 1 hour) carries out high-precision evaluation to the performance of magnesium oxide that makes heavy metals insoluble simply at short notice.Particularly in operation (A), consumption to the compound that contains 6 valency chromium is set so that the quality of 6 valency chromium is 1.0mg～2.0mg with respect to 1 liter of water as the solvent of slurry, and magnesian consumption set so that magnesium oxide is 10g～35g with respect to 1 liter of water as the solvent of slurry, just can be as long as set like this by (for example using commercially available simple measuring device, " digital water quality ion test pack (the digital pack test) " that upright altogether RIKEN makes) carry out operation (C) (evaluation operation) with the time that is no more than 10 minutes, in this case, times that can operation (A)～operation (C) is all required shorten for example in 30 minutes.
And,, only need to prepare the compound that contains 6 valency chromium of trace, even do not prepare the performance that contaminated soil also can be estimated magnesium oxide that makes heavy metals insoluble according to evaluation method of the present invention.
Embodiment
The evaluation method of the performance of magnesium oxide that makes heavy metals insoluble of the present invention comprises following operation: (A) mixed processes, in this operation, will contain the compound of 6 valency chromium and magnesium oxide and mix with water as solvent and stir, to obtain slurry; (B) solid-liquid separation process, in this operation, the slurry that obtains is carried out Separation of Solid and Liquid, obtain liquid component and solid constituent, described liquid component comprises and is derived from the described 6 valency chromium ions that contain the compound of 6 valency chromium of part, described solid constituent comprise be derived from remainder described contain 6 valency chromium compound 6 valency chromium and be derived from described magnesian magnesium hydroxide; And (C) estimate operation, in this operation, the concentration of 6 valency chromium ions in the liquid component that obtains is measured, to estimate the performance of described magnesium oxide that makes heavy metals insoluble.
Below operation (A)～operation (C) is described in detail.
[operation (A): mixed processes]
Operation (A) is to mix with water as solvent and stir containing the compound of 6 valency chromium and magnesium oxide, thereby obtains the operation of slurry.
For the compound that contains 6 valency chromium, so long as can in water, supply with ion (for example, the chromate (CrO that contains 6 valency chromium
4 2-), dichromate ion (Cr
2O
7 2-) etc.) and water soluble compound get final product.And,, also can use the potpourri that does not influence the material of effect of the present invention with other as the compound that contains 6 valency chromium.The form that contains the compound of 6 valency chromium can be any one in liquid and the solid.
As the compound that contains 6 valency chromium, for example can enumerate sodium bichromate dihydrate, dichromic acid pyridine, fluorine chromic acid pyridine, poly-(dichromic acid-4-vinylpridine), chromic anhybride, chromium titer (Cr-1000), chromium titer (Cr-100), zinc chromate, ammonium chromate, potassium chromate, sodium chromate tetrahydrate, plumbous chromate (II), barium chromate, chromium carbonyl, chloro-chromic acid 2,2 '-dipyridine, pyridinium chlorochromate, chromium oxychloride, titrisol chromium standard solution, ammonium dichromate, dichromic acid imidazoles, potassium dichromate etc.
For the amount of the compound that contains 6 valency chromium, with respect to 1 liter of water as the solvent of slurry, its amount is preferably 0.75mg～10mg in the quality of 6 valency chromium, and more preferably 0.9mg～5mg is preferably 1.0mg～2.0mg especially.This value is during less than 0.75mg, then no matter the performance quality of magnesium oxide that makes heavy metals insoluble whether, the measured value of 6 valency chromium ion concentrations all can diminish in the operation (C), may be difficult to estimate magnesium oxide.This value is during greater than 10mg, and the quantitative change of discarded object that then contains 6 valency chromium is many, increased the processing burden of discarded object.
Magnesium oxide can obtain by for example firing the compound that magnesium carbonate, magnesium hydroxide etc. contain magnesium.Firing temperature is preferably 750 ℃～950 ℃, more preferably 800 ℃～900 ℃.When firing temperature during less than 750 ℃, then the firing time elongated, magnesian manufacturing efficient can reduce.When firing temperature surpasses 950 ℃, there is the tendency of the performance reduction of magnesium oxide that makes heavy metals insoluble.
For magnesian amount, with respect to 1 liter of water as the solvent of slurry, its amount is preferably 3g～100g, 5g～100g more preferably, and more preferably 7g～50g is preferably 10g～35g especially.This amount is during less than 3g, then no matter the performance quality of magnesium oxide that makes heavy metals insoluble whether, the measured value of the concentration of 6 valency chromium ions can become too small in the operation (C), may be difficult to estimate magnesium oxide.When this amount surpassed 100g, then magnesian evaluation precision may reduce.
Evaluation object thing of the present invention is a magnesium oxide, as this magnesium oxide, only otherwise influence effect of the present invention, also can use the potpourri of magnesium oxide and other materials.As other materials, can enumerate zeolite, zeyssatite, carclazyte, bentonitic clay, dry clay, lime carbonate, silica powder, gypsum etc.In other materials and magnesian total amount, the ratio of other materials is preferably below the 70 quality %, more preferably below the 50 quality %.
Need to prove,, for example can enumerate the material (reductive agent, for example iron sulfate (II), calcium sulfide etc.) that 6 valency chromium is reduced to 3 valency chromium as other materials that can influence effect of the present invention.
From the viewpoint of the evaluation precision that improves evaluation method of the present invention, the concentration of the chlorion in the slurry of operation (A) is preferably below 0.03mg/ rises.Need to prove that in this manual, the concentration of chlorion is meant and is scaled muriatic ion (Cl
-) wait the concentration behind the chlorine atom (Cl) of chloride ion-containing.
For the concentration with the chlorion in the slurry is controlled in the described preferred numerical range,, use distilled water or ion exchange water to get final product as the water that uses in the operation (A).Use under the situation of tap water, the concentration of the chlorion in the slurry can surpass the 0.03mg/ liter usually.
From the viewpoint of the evaluation precision that improves evaluation method of the present invention, the electrical conductivity of water that uses in the operation (A) is preferably below the 0.5 μ S/cm.
Mix and stirring method with water as the compound that will contain 6 valency chromium and magnesium oxide, for example can enumerate and mixing be contained the compound of 6 valency chromium and aqueous solution that water forms is mixed also stirring method with magnesium oxide as solvent.
The lower limit of mixing time was preferably more than 15 minutes.When this was worth less than 15 minutes, magnesian evaluation precision may reduce.
Higher limit to mixing time is not particularly limited, and from the viewpoint of the efficiency of evaluation method of the present invention, preferred mixing time is in 2 hours, in more preferably 1 hour, more preferably in 30 minutes, is preferably especially in 20 minutes.
[operation (B): solid-liquid separation process]
Operation (B) is that the slurry that obtains is carried out Separation of Solid and Liquid, to obtain the operation of liquid component and solid constituent, described liquid component comprises and is derived from the described 6 valency chromium ions that contain the compound of 6 valency chromium of part, described solid constituent comprise be derived from remainder described contain 6 valency chromium compound 6 valency chromium and be derived from magnesian magnesium hydroxide.
As the method for Separation of Solid and Liquid, can enumerate filtration, centrifuging etc.
As solid-liquid separating equipment, can enumerate syringe, filtration under diminished pressure device, centrifugal separating device that filtrator (filter plant) is installed at front end etc.
[operation (C): estimate operation]
Operation (C) is that the concentration of 6 valency chromium ions in the liquid component that operation (B) is obtained is measured, with the operation that the performance of magnesium oxide that makes heavy metals insoluble is estimated.
The concentration of 6 valency chromium ions is meant the concentration behind the chromium atom (Cr) that is scaled in the ion (for example dichromate ion) that contains 6 valency chromium.
In the present invention, suppose that the compound dissolution that does not use magnesium oxide and only will contain 6 valency chromium in operation (A) is in water, when being reference value with the concentration of 6 valency chromium ions in the liquid component in this case, the concentration of 6 valency chromium ions has higher relevance with respect to the degree of this reference value reduction and the performance of magnesium oxide that makes heavy metals insoluble, can estimate the performance of magnesium oxide that makes heavy metals insoluble.In addition, through the inventor's experiment confirm,, when making the insoluble performance of 6 valency chromium high, make the insoluble performance of heavy metals such as lead, cadmium also high therefore for magnesium oxide.That is, make the insoluble performance of 6 valency chromium and make the insoluble performance of other heavy metals closely related.In the present invention, based on this understanding, will make the evaluation of the insoluble performance of 6 valency chromium be converted to the evaluation that makes the insoluble performance of heavy metal.
Do not adopt evaluation method of the present invention and when the performance of magnesium oxide that makes heavy metals insoluble estimated, magnesium oxide need be mixed with contaminated soil, carry out quantitative test through the stripping quantity to heavy metals such as 6 valency chromium after specified time limit (for example 28 days), thereby estimate the performance of magnesium oxide that makes heavy metals insoluble.At this on the one hand, evaluation method of the present invention does not need contaminated soil, and can estimate quickly and easily.
[operation (D): sorting operation]
Evaluation method of the present invention is except operation (A)～(C), also comprise sorting operation (D):, from two or more magnesium oxide, select and make the higher magnesium oxide of the insoluble performance of heavy metal as the magnesium oxide that is suitable for use as heavy metal stripping depressant etc. according to the evaluation result of operation (C).
As the preference of the evaluation method of the present invention that comprises operation (D), can enumerate the method for all conditions that satisfies following (a)～(d).
(a) amount of the compound that contains 6 valency chromium in the operation (A) is counted 1.0mg～2.0mg with respect to 1 liter of water as the solvent of slurry with the quality of 6 valency chromium.
(b) the magnesian amount in the operation (A) is 10g～35g with respect to 1 liter of water as the solvent of slurry.
(c) mixing time in the operation (A) is 15 minutes～20 minutes.
(d) in operation (D), select the above magnesium oxide that reclaims with the form of solid constituent of 35 quality % of the total amount of 6 valency chromium in the compound of confirming to contain 6 valency chromium.
Except that magnesium oxide, can also comprise other materials (for example, zeolite, zeyssatite, carclazyte, bentonitic clay, dry clay, lime carbonate, silica powder, gypsum etc.) in the heavy metal stripping depressant.In this case, the magnesium oxide of selecting is mixed preparation heavy metal stripping depressant with other materials.
The addition of heavy metal stripping depressant is also according to the difference of the kind of the heavy metal that is contained in the contaminated soil, amount etc. and difference, usually with respect to 1m
3Contaminated soil, preferably its addition is more than the 10kg, more preferably more than the 50kg.The upper limit to its addition is not particularly limited, usually with respect to 1m
3Contaminated soil be 300kg.
Embodiment
[embodiment 1～6]
(1) as the magnesian preparation of evaluation object thing
At about 800 ℃～1100 ℃ heating raw magnesites 4 hours, obtain various magnesium oxide (below be called " light calcined magnesia A "～" light calcined magnesia F ").
Dissolving 0.04243g potassium dichromate (K in 1 liter of distilled water
2Cr
2O
7), after the concentration that is prepared into 6 valency chromium (Cr) was the solution of 15.0mg/ liter, with 10 times of this solution dilutions, the concentration of preparing 6 valency chromium was the solution that contains 6 valency chromium (" Cr (1) " in the table 1) that 1.5mg/ rises with distilled water.
Then, pour into 100 milliliters of these solution that contain 6 valency chromium in the oscillator after, in this oscillator, add the MgO (light calcined magnesia) of kind shown in the 1g table 1, vibrate.Need to prove that " A "～" F " in " kind of the MgO " hurdle in the table 1 represents " light calcined magnesia A "～" light calcined magnesia F " respectively.
Vibration is carried out under 15 minutes, 200 times/minute conditioned disjunction 60 minutes, 200 times/minute condition.
After the vibration, (mesh size: syringe 0.45 μ m) is extracted 10 milliliters of liquid compositions out from resulting slurry, and the concentration (mg/ liter) of 6 valency chromium ions in this liquid component is measured with front end membrane filter to be installed.The result represents with " stripping quantity of heavy metal etc. (mg/L) " in table 1.
The performance that the situation that the concentration of vibration 6 valency chromium ions in the liquid component after 15 minutes is risen less than 1.0mg/ is decided to be magnesium oxide that makes heavy metals insoluble is good situation (being " zero " in the table 1), with the concentration of this 6 valency chromium ion be 1.0mg/ to rise the performance that above situation is decided to be magnesium oxide that makes heavy metals insoluble be condition of poor (being " * " in the table 1), with this magnesium oxide is estimated.Evaluation result is represented with " evaluation result of the MgO that the brief appraisal method draws " in table 1.
On the other hand, in containing the contaminated soil of 6 valency chromium that concentration is 7.5mg/kg, add any and the amount that makes this light calcined magnesia among described " light calcined magnesia A "～" the light calcined magnesia F " with respect to 1m
3Contaminated soil is 100kg, and adjusts liquid water content so that cumulative water-oil ratio is 142%, mixes, and places then.Need to prove that cumulative water-oil ratio is meant: (dry mass of the quality/contaminated soil of water) * 100.
Mix after 7 days, carry out the dissolution test of 6 valency chromium according to No. 46 method of Japanese Environment Ministry bulletin.
The result represents with " stripping quantities (mg/L) of the heavy metal in the contaminated soil experiment etc. " in table 1.Need to prove that the concentration of this 6 valency chromium ion when not adding light calcined magnesia is measured, the result is the 0.98mg/ liter.
The performance that the situation that the concentration of 6 valency chromium ions is risen less than 0.40mg/ is decided to be magnesium oxide that makes heavy metals insoluble is good situation (being " zero " in the table 1), with the concentration of 6 valency chromium ions be 0.40mg/ to rise the performance that above situation is decided to be magnesium oxide that makes heavy metals insoluble be condition of poor (being " * " in the table 1), with this magnesium oxide is estimated.Evaluation result is represented with " evaluation result of the MgO that the contaminated soil experiment draws " in table 1.
By the embodiment in the table 1 1～6 as can be known, utilize the evaluation result of the light calcined magnesia that brief appraisal method of the present invention draws consistent with the result who makes the insoluble performance of heavy metal of the light calcined magnesia (MgO) that uses the contaminated soil factual survey.
[embodiment 7]
Use chromium trioxide (CrO
3) replacement potassium dichromate (K
2Cr
2O
7), the concentration for preparing 6 valency chromium is the solution that contains 6 valency chromium (" Cr (2) " in the table 1) that 1.5mg/ rises, and in addition, experimentizes in similarly to Example 1 mode.The result is as shown in table 1, has obtained the result identical with embodiment 1.
[embodiment 8]
Use is as potassium dichromate (K
2Cr
2O
7) and the atom extinction of the potpourri of nitric acid replace potassium dichromate (K with standard reagent
2Cr
2O
7), the concentration for preparing 6 valency chromium is that (" Cr (3) " in the table 1 pH4.5), in addition, experimentize in similarly to Example 1 mode the solution that contains 6 valency chromium that rises of 1.5mg/.The result is as shown in table 1, has obtained the result identical with embodiment 1.
In addition, become 7.2 or become each situation of 9.8 for the pH that uses NaOH to make the solution that contains 6 valency chromium by 4.5, to test with above-mentioned same mode.The result does not find to change the notable difference that causes by pH.
By the result of embodiment 7,8 as can be known, even change the kind of the compound that contains 6 valency chromium or the pH of solvent, evaluation result of the present invention can not change yet.
[comparative example 1,2]
Use plumbi nitras (PbNO
3) replace potassium dichromate, the concentration of preparation plumbous (Pb) be 1.5mg/ rise contain plumbous solution, in addition, to experimentize with the same mode of embodiment 1,6.The result does not detect lead in liquid component after stirring 15 minutes and 60 minutes.
[comparative example 3,4]
Use caddy (CdCl
2) to replace potassium dichromate, the concentration of preparation cadmium (Cd) be the solution that contains cadmium that 1.5mg/ rises, in addition, to experimentize with the same mode of embodiment 1,6.The result does not detect cadmium in liquid component after stirring 15 minutes and 60 minutes.
[comparative example 5,6]
Use sodium arsenite (NaAsO
2) to replace potassium dichromate, the concentration of preparation arsenic (As) be the solution that contains arsenic that 1.5mg/ rises, in addition, to experimentize with the same mode of embodiment 1,6.The result does not detect arsenic in liquid component after stirring 15 minutes and 60 minutes.Need to prove, though arsenic is not heavy metal, be the objectionable impurities that usually contains in the contaminated soil.
[comparative example 7,8]
Use potassium fluoride (KF) to replace potassium dichromate, the concentration of preparation fluorine (F) is the solution that contains fluorine that 1.5mg/ rises, in addition, and to experimentize with the same mode of embodiment 1,6.Need to prove, though fluorine neither heavy metal, be the objectionable impurities that usually contains in the contaminated soil.The result is after stirring 15 minutes and 60 minutes, and the fluorine concentration in liquid component all is that light calcined magnesia F is lower than light calcined magnesia A, and is opposite with the result who makes the insoluble performance of heavy metal who uses contaminated soil factual survey light calcined magnesia.
[comparative example 9,10]
Use sodium tetraborate (Na
2B
4O
710H
2O) replace potassium dichromate, the concentration of preparation boron (B) is the solution that contains boron that 1.5mg/ rises, in addition, and to experimentize with the same mode of embodiment 1,6.Need to prove, though boron neither heavy metal, be the objectionable impurities that usually contains in the contaminated soil.The result is after stirring 15 minutes and 60 minutes, and the boron concentration in liquid component all is that light calcined magnesia A is identical with light calcined magnesia F.
Can not estimate the quality of the performance of magnesium oxide that makes heavy metals insoluble when by the result of comparative example 1～10 as can be known, using heavy metal beyond the 6 valency chromium etc.
[embodiment 9～43]
Use with embodiment 1～8 in the diverse light calcined magnesia of light calcined magnesia (below be called " light calcined magnesia G ") that uses, be prepared into the 6 valency chromium and the magnesian slurry of the amount shown in the table 2 that contains (with respect to the amount of 1 premium on currency), and be set at the duration of oscillation shown in the table 2, in addition, experimentize in similarly to Example 1 mode.In addition, 6 valency chromium amounts in the every premium on currency among the embodiment 22 are identical with embodiment 1～8 with the magnesium oxide amount.
Among the embodiment 22, when duration of oscillation was 15 minutes, the stripping quantity of 6 valency chromium was the 1.06mg/ liter in the liquid component.This value is identical with embodiment 6 (using the experimental example of light calcined magnesia F).Therefore, the evaluation result that makes the insoluble performance of heavy metal of the light calcined magnesia G that uses among the embodiment 9～43 is " * " (bad).
Among the embodiment 9～43, be that the mass ratio of the 6 insoluble valency chromium that go out of basic calculation is listed in table 2 with the measured value of the stripping quantity of 6 valency chromium in the liquid component.
Table 2
Claims (7)
1. the evaluation method of the performance of a magnesium oxide that makes heavy metals insoluble is characterized in that, this method comprises following operation:
(A) mixed processes in this operation, will contain the compound of 6 valency chromium and magnesium oxide and mix with water as solvent and stir, to obtain slurry;
(B) solid-liquid separation process, in this operation, the slurry that obtains is carried out Separation of Solid and Liquid, obtain liquid component and solid constituent, described liquid component comprises and is derived from the described 6 valency chromium ions that contain the compound of 6 valency chromium of part, described solid constituent comprise be derived from remainder described contain 6 valency chromium compound 6 valency chromium and be derived from described magnesian magnesium hydroxide; And
(C) estimate operation, in this operation, the concentration of 6 valency chromium ions in the liquid component that obtains is measured, to estimate the performance of described magnesium oxide that makes heavy metals insoluble.
2. the evaluation method of the performance of magnesium oxide that makes heavy metals insoluble as claimed in claim 1, wherein, in operation (A), with respect to 1 liter of water as the solvent of described slurry, the described amount that contains the compound of 6 valency chromium is counted 0.75mg～10mg with the quality of 6 valency chromium.
3. the evaluation method of the performance of magnesium oxide that makes heavy metals insoluble as claimed in claim 1 or 2, wherein, in operation (A), with respect to 1 liter of water as the solvent of described slurry, described magnesian amount is 3g～100g.
4. as the evaluation method of the performance of each described magnesium oxide that makes heavy metals insoluble of claim 1～3, wherein, in operation (A), mixing time is more than 15 minutes.
5. as the evaluation method of the performance of each described magnesium oxide that makes heavy metals insoluble of claim 1～4, wherein, it is below 0.03mg/ rises that the concentration conversion of the chloride ion in the slurry of operation (A) becomes the chlorine atom.
6. as the evaluation method of the performance of each described magnesium oxide that makes heavy metals insoluble of claim 1～5, wherein, this method is except comprising operation (A)～(C), also comprise sorting operation (D), in this operation (D), according to the evaluation result of operation (C), from two or more magnesium oxide, select and have the higher magnesium oxide that makes the insoluble performance of heavy metal.
7. the evaluation method of the performance of magnesium oxide that makes heavy metals insoluble as claimed in claim 6, wherein, in operation (A), with respect to 1 liter of water as the solvent of described slurry, the described amount that contains the compound of 6 valency chromium is counted 1.0mg～2.0mg with the quality of 6 valency chromium, described magnesian amount is 10g～35g with respect to 1 liter of water as the solvent of described slurry, mixing time is 15 minutes～20 minutes, and, in operation (D), select and confirm the magnesium oxide that reclaims with the form of described solid constituent more than the 35 quality % of the total amount of 6 valency chromium in the described compound that contains 6 valency chromium.
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| JP2008164020A JP4999786B2 (en) | 2008-06-24 | 2008-06-24 | Method for evaluating heavy metal insolubilization performance of magnesium oxide |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101949920A (en) * | 2010-09-15 | 2011-01-19 | 上海岩土工程勘察设计研究院有限公司 | Method for determining pollution level of polluted soil |
| CN102895936A (en) * | 2011-07-29 | 2013-01-30 | 住友大阪水泥股份有限公司 | Dissolving-out reduction material and manufacturing method thereof |
| CN105181759A (en) * | 2015-10-16 | 2015-12-23 | 上海岩土工程勘察设计研究院有限公司 | Method for judging contamination degree of heavy-metal contaminated soil based on indoor test |
| CN108785951A (en) * | 2017-05-02 | 2018-11-13 | 广州市川清环保科技有限公司 | The insoluble inorganic agent of heavy metal and the insoluble processing method of heavy metal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10316967A (en) * | 1997-05-15 | 1998-12-02 | Katsuichi Kunimatsu | Soil solidification agent |
| JPH11147082A (en) * | 1997-11-14 | 1999-06-02 | Miyoshi Oil & Fat Co Ltd | Method for treating metal-containing solid waste |
| JP3721970B2 (en) * | 2000-09-21 | 2005-11-30 | 栗田工業株式会社 | Purification method for contaminated soil |
| JP2002206090A (en) * | 2000-11-09 | 2002-07-26 | Matsuda Giken Kogyo Kk | Neutral soil-solidifying agent and method of improving ground and the like, and means for preventing elution of heavy metal |
| JP2004306017A (en) * | 2003-03-26 | 2004-11-04 | Ohbayashi Corp | Cleaning system for polluted soil |
| JP3980533B2 (en) * | 2003-07-11 | 2007-09-26 | 株式会社竹中工務店 | Methods for preventing leaching of toxic metals from hazardous metal contaminated waste |
| JP2006349494A (en) * | 2005-06-15 | 2006-12-28 | Toda Kogyo Corp | Evaluation method of penetration state of ferrous purifying agent in soil |
| JP5158462B2 (en) * | 2006-03-31 | 2013-03-06 | 住友大阪セメント株式会社 | Reduced solidification of toxic metals |
| JP5291333B2 (en) * | 2007-12-26 | 2013-09-18 | 太平洋セメント株式会社 | Insolubilizing material and insolubilizing method |
-
2008
- 2008-06-24 JP JP2008164020A patent/JP4999786B2/en active Active
- 2008-08-25 CN CN200810212623A patent/CN101614723A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101949920A (en) * | 2010-09-15 | 2011-01-19 | 上海岩土工程勘察设计研究院有限公司 | Method for determining pollution level of polluted soil |
| CN102895936A (en) * | 2011-07-29 | 2013-01-30 | 住友大阪水泥股份有限公司 | Dissolving-out reduction material and manufacturing method thereof |
| CN102895936B (en) * | 2011-07-29 | 2016-09-28 | 住友大阪水泥股份有限公司 | Dissolution reduces material and manufacture method thereof |
| CN105181759A (en) * | 2015-10-16 | 2015-12-23 | 上海岩土工程勘察设计研究院有限公司 | Method for judging contamination degree of heavy-metal contaminated soil based on indoor test |
| CN108785951A (en) * | 2017-05-02 | 2018-11-13 | 广州市川清环保科技有限公司 | The insoluble inorganic agent of heavy metal and the insoluble processing method of heavy metal |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2010005488A (en) | 2010-01-14 |
| JP4999786B2 (en) | 2012-08-15 |
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