CN110963651A - Laterite-nickel ore sludge solidification and stabilization treatment method - Google Patents
Laterite-nickel ore sludge solidification and stabilization treatment method Download PDFInfo
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- CN110963651A CN110963651A CN201911067062.3A CN201911067062A CN110963651A CN 110963651 A CN110963651 A CN 110963651A CN 201911067062 A CN201911067062 A CN 201911067062A CN 110963651 A CN110963651 A CN 110963651A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
- G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
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Abstract
The invention belongs to the technical field of sludge solidification treatment, and particularly relates to a laterite-nickel ore sludge solidification stabilization treatment method which comprises the following steps of weighing 50g of sludge sample, placing the sludge sample into a 2L extraction bottle, calculating the volume of a required lixiviant according to a liquid-solid ratio of 10:1(L/kg), adding the lixiviant, covering a bottle cover, fixing the bottle cover on a turnover type oscillating device, oscillating the mixed solution at the room temperature for 18 hours at 30r/min, standing for 16 hours, filtering the standing solution on a vacuum filtering device through a 0.45 mu m filter membrane, collecting the lixivium, and measuring heavy metal ions in the lixivium; when the adding amount of the agent is between 1 and 2 percent, the heavy metals such as Ni, Zn, Cd, Pb, Cr, Cu and the like in the laterite-nickel ore can play a better stabilizing effect, after the sludge is solidified/stabilized, the sludge has different heavy metal forms in different environments, the leaching amount of the heavy metals is smaller under the oxidation state condition, the migration difficulty in the environment is the greatest, and the pollution is smaller.
Description
Technical Field
The invention belongs to the technical field of sludge solidification treatment, and particularly relates to a laterite-nickel ore sludge solidification stabilization treatment method.
Background
With the acceleration of the urbanization and industrialization process in China, various industrial facilities, municipal construction and energy development develop rapidly, and the yield of solid wastes is increased rapidly, however, the existing solid waste treatment capacity in China cannot meet the rapidly increased solid waste generation amount, main pollution elements are Ni, Pb, Cr, Cd, Hg, Zn and the like, the heavy metals are easy to leach under the acidic environment condition, if the treatment is improper, under certain adverse environments, the toxic and harmful heavy metals can enter the environment, and gradually migrate and convert to pollute underground water and air, so that great harm is caused to the ecological environment, the health of human bodies and other animals and plants is finally harmed through food chains, and the pollution and recontamination problems caused by the random disposal and stacking of sludge to the environment become environment problems which need to be solved urgently.
The pollutants are embedded through inert materials in the immobilization treatment, so that the exposure area of the pollutants is reduced, the migration of the pollutants is limited, the chemical form of the heavy metal is changed mainly through adding stabilizing agents in the stabilization treatment, the solubility, the migration and the toxicity of the heavy metal are reduced, and the purpose of reducing the environmental risk is achieved.
Disclosure of Invention
To solve the problems set forth in the background art described above. The invention provides a method for solidifying and stabilizing the sludge of laterite-nickel ore, which has the characteristic of better stabilizing effect on heavy metals such as Ni, Zn, Cd, Pb, Cr, Cu and the like in laterite-nickel ore.
In order to achieve the purpose, the invention provides the following technical scheme: a laterite-nickel ore sludge solidification and stabilization treatment method comprises the following steps:
step S1, measuring the water content of the sludge sample:
weighing 10g of sample, placing the sample in a container with a cover, drying the sample at the temperature of 100 ℃ and 110 ℃, and calculating the water content of the sample.
Step S2, testing leaching toxicity of the sludge sample:
s21, weighing 50g of sludge sample, placing the sludge sample in a 2L extraction bottle, calculating the volume of the required extractant according to the water content of the sample and the liquid-solid ratio of 10:1(L/kg), adding the extractant, covering a bottle cap, fixing the bottle cap on a turnover type oscillation device, oscillating the mixed solution at 25-35r/min at room temperature for 17-19h, and standing for 15-17 h;
s22, filtering the standing solution on a vacuum filter device through a 0.45-micrometer filter membrane, collecting the leachate, and storing at 4 ℃ to be detected;
s23, determining heavy metal ions of nickel, zinc, copper, cadmium and chromium in the leachate;
step S3, sludge sample stabilization experiment:
s31, reducing the particle size of the sample particles by crushing, cutting or grinding, so that the sample particles can pass through a screen with 9.5mm of aperture;
s32, firstly, weighing 80g of sample, placing the sample in a 500mL beaker, adding a stabilizing agent according to a certain mass ratio, adding deionized water, and stirring to ensure that the sludge is uniformly contacted with the agent and the water content is kept at 35%;
and S32, placing the laterite-nickel ore sludge added with the chemical agent indoors, stabilizing for 10-14h, and airing the stabilized sludge for secondary leaching toxicity test.
S33, leaching toxicity test is carried out according to the step S2, and all stabilized samples take untreated sludge as blank control.
Preferably, the sludge sample after the moisture content measurement in the step S1 is not used for the solidification stabilization test and the leaching toxicity test.
Preferably, the stabilizing agent HKS-01 is used in step S32.
Preferably, the error of the constant weight to twice weighing value in the step S1 is less than ± 1%.
Compared with the prior art, the invention has the beneficial effects that:
1. by adopting the treatment method, the selected laterite-nickel ore sludge sample leachate is detected with heavy metals such as Zn, Pb, Ni, Cr, Cu and the like, wherein the leaching concentrations of Zn, Pb, Cr, Cu and Cd do not exceed the relevant index limit values specified in hazardous waste identification standard leaching toxicity identification.
2. The dosage of the medicament has an obvious relationship with the stabilization of heavy metals, but the different heavy metals have different strengths, and when the dosage of the medicament is between 1 and 2 percent, the heavy metals such as Ni, Zn, Cd, Pb, Cr, Cu and the like in the laterite-nickel ore can play a better stabilization effect.
3. After the sludge is solidified/stabilized, the forms of heavy metals of the sludge in different environments are different, wherein the leaching amount of the heavy metals is smaller under the oxidation state condition, which indicates that the binding capacity of the heavy metals and the sludge is stronger, the migration difficulty in the environment is the greatest, and the pollution is smaller.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the present invention provides the following technical solutions: a laterite-nickel ore sludge solidification and stabilization treatment method comprises the following steps:
step S1, measuring the water content of the sludge sample:
weighing 10g of sample, placing the sample in a container with a cover, drying the sample at 100 ℃, and calculating the water content of the sample.
Step S2, testing leaching toxicity of the sludge sample:
s21, weighing 50g of sludge sample, placing the sludge sample in a 2L extraction bottle, calculating the volume of the required extractant according to the water content of the sample and the liquid-solid ratio of 10:1(L/kg), adding the extractant, covering a bottle cap, fixing the bottle cap on a turnover type oscillation device, oscillating the mixed solution at 25r/min at room temperature for 17h, and standing for 15 h;
s22, filtering the standing solution on a vacuum filter device through a 0.45-micrometer filter membrane, collecting the leachate, and storing at 4 ℃ to be detected;
s23, determining heavy metal ions of nickel, zinc, copper, cadmium and chromium in the leachate;
step S3, sludge sample stabilization experiment:
s31, reducing the particle size of the sample particles by crushing, cutting or grinding, so that the sample particles can pass through a screen with 9.5mm of aperture;
s32, firstly, weighing 80g of sample, placing the sample in a 500mL beaker, adding a stabilizing agent according to a certain mass ratio, adding deionized water, and stirring to ensure that the sludge is uniformly contacted with the agent and the water content is kept at 35%;
and S32, placing the laterite-nickel ore sludge added with the medicament indoors, stabilizing for 10h, and airing the stabilized sludge for secondary leaching toxicity test.
S33, leaching toxicity test is carried out according to the step S2, and all stabilized samples take untreated sludge as blank control.
Specifically, the sludge sample subjected to the moisture content measurement in step S1 is not used for the solidification stabilization test and the leaching toxicity test.
Specifically, the stabilizing agent HKS-01 is added in step S32.
Specifically, the error between the constant weight and the two weighing values in step S1 is less than ± 1%.
In the embodiment, the dosage of the medicament has an obvious relationship with the stabilization of the heavy metal, but different heavy metals have different performances, when the dosage of the medicament is 1-2%, the heavy metals such as Ni, Zn, Cd, Pb, Cr, Cu and the like in the laterite-nickel ore can have better stabilization effects, and after the sludge is solidified/stabilized, the forms of the heavy metals of the sludge in different environments are different, wherein the leaching amount of the heavy metals under an oxidation state condition is smaller, which indicates that the binding capacity of the heavy metals and the sludge is stronger, the migration difficulty in the environment is the largest, and the pollution performance is smaller.
Example 2
Referring to fig. 1, the present invention provides the following technical solutions: a laterite-nickel ore sludge solidification and stabilization treatment method comprises the following steps:
step S1, measuring the water content of the sludge sample:
weighing 10g of sample, placing the sample in a container with a cover, drying the sample at 105 ℃, and calculating the water content of the sample.
Step S2, testing leaching toxicity of the sludge sample:
s21, weighing 50g of sludge sample, placing the sludge sample in a 2L extraction bottle, calculating the volume of the required extractant according to the water content of the sample and the liquid-solid ratio of 10:1(L/kg), adding the extractant, covering a bottle cap, fixing the bottle cap on a turnover type oscillation device, oscillating the mixed solution at the room temperature for 18h at 30r/min, and standing for 16 h;
s22, filtering the standing solution on a vacuum filter device through a 0.45-micrometer filter membrane, collecting the leachate, and storing at 4 ℃ to be detected;
s23, determining heavy metal ions of nickel, zinc, copper, cadmium and chromium in the leachate;
step S3, sludge sample stabilization experiment:
s31, reducing the particle size of the sample particles by crushing, cutting or grinding, so that the sample particles can pass through a screen with 9.5mm of aperture;
s32, firstly, weighing 80g of sample, placing the sample in a 500mL beaker, adding a stabilizing agent according to a certain mass ratio, adding deionized water, and stirring to ensure that the sludge is uniformly contacted with the agent and the water content is kept at 35%;
and S32, placing the laterite-nickel ore sludge added with the medicament indoors, stabilizing for 12h, and airing the stabilized sludge for secondary leaching toxicity test.
S33, leaching toxicity test is carried out according to the step S2, and all stabilized samples take untreated sludge as blank control.
Specifically, the sludge sample subjected to the moisture content measurement in step S1 is not used for the solidification stabilization test and the leaching toxicity test.
Specifically, the stabilizing agent HKS-01 is added in step S32.
Specifically, the error between the constant weight and the two weighing values in step S1 is less than ± 1%.
In the embodiment, the dosage of the medicament has an obvious relationship with the stabilization of the heavy metals, but the performances of different heavy metals are different, and when the dosage of the medicament is between 1% and 2%, the heavy metals such as Ni, Zn, Cd, Pb, Cr, Cu and the like in the laterite-nickel ore can play a better stabilization effect.
Example 3
Referring to fig. 1, the present invention provides the following technical solutions: a laterite-nickel ore sludge solidification and stabilization treatment method comprises the following steps:
step S1, measuring the water content of the sludge sample:
weighing 10g of sample, placing the sample in a container with a cover, drying the sample at 110 ℃, and calculating the water content of the sample.
Step S2, testing leaching toxicity of the sludge sample:
s21, weighing 50g of sludge sample, placing the sludge sample in a 2L extraction bottle, calculating the volume of the required extractant according to the water content of the sample and the liquid-solid ratio of 10:1(L/kg), adding the extractant, covering a bottle cap, fixing the bottle cap on a turnover type oscillation device, oscillating the mixed solution at the room temperature of 35r/min for 19 hours, and standing for 17 hours;
s22, filtering the standing solution on a vacuum filter device through a 0.45-micrometer filter membrane, collecting the leachate, and storing at 4 ℃ to be detected;
s23, determining heavy metal ions of nickel, zinc, copper, cadmium and chromium in the leachate;
step S3, sludge sample stabilization experiment:
s31, reducing the particle size of the sample particles by crushing, cutting or grinding, so that the sample particles can pass through a screen with 9.5mm of aperture;
s32, firstly, weighing 80g of sample, placing the sample in a 500mL beaker, adding a stabilizing agent according to a certain mass ratio, adding deionized water, and stirring to ensure that the sludge is uniformly contacted with the agent and the water content is kept at 35%;
and S32, placing the laterite-nickel ore sludge added with the chemical agent indoors, stabilizing for 14h, and airing the stabilized sludge for secondary leaching toxicity test.
S33, leaching toxicity test is carried out according to the step S2, and all stabilized samples take untreated sludge as blank control.
Specifically, the sludge sample subjected to the moisture content measurement in step S1 is not used for the solidification stabilization test and the leaching toxicity test.
Specifically, the stabilizing agent HKS-01 is added in step S32.
Specifically, the error between the constant weight and the two weighing values in step S1 is less than ± 1%.
In this embodiment, after the sludge is solidified/stabilized, the forms of heavy metals of the sludge in different environments are different, wherein the leaching amount of the heavy metals is smaller under the oxidation state condition, which indicates that the binding ability of the heavy metals and the sludge is stronger, the migration difficulty in this environment is the greatest, and the pollution is smaller.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A laterite-nickel ore sludge solidification and stabilization treatment method is characterized by comprising the following steps:
step S1, measuring the water content of the sludge sample:
weighing 10g of sample, placing the sample in a container with a cover, drying the sample at the temperature of 100 ℃ and 110 ℃, and calculating the water content of the sample.
Step S2, testing leaching toxicity of the sludge sample:
s21, weighing 50g of sludge sample, placing the sludge sample in a 2L extraction bottle, calculating the volume of the required extractant according to the water content of the sample and the liquid-solid ratio of 10:1(L/kg), adding the extractant, covering a bottle cap, fixing the bottle cap on a turnover type oscillation device, oscillating the mixed solution at 25-35r/min at room temperature for 17-19h, and standing for 15-17 h;
s22, filtering the standing solution on a vacuum filter device through a 0.45-micrometer filter membrane, collecting the leachate, and storing at 4 ℃ to be detected;
s23, determining heavy metal ions of nickel, zinc, copper, cadmium and chromium in the leachate;
step S3, sludge sample stabilization experiment:
s31, reducing the particle size of the sample particles by crushing, cutting or grinding, so that the sample particles can pass through a screen with 9.5mm of aperture;
s32, firstly, weighing 80g of sample, placing the sample in a 500mL beaker, adding a stabilizing agent according to a certain mass ratio, adding deionized water, and stirring to ensure that the sludge is uniformly contacted with the agent and the water content is kept at 35%;
and S32, placing the laterite-nickel ore sludge added with the chemical agent indoors, stabilizing for 10-14h, and airing the stabilized sludge for secondary leaching toxicity test.
S33, leaching toxicity test is carried out according to the step S2, and all stabilized samples take untreated sludge as blank control.
2. The lateritic nickel ore sludge solidification and stabilization treatment method according to claim 1, characterized in that: the sludge sample subjected to the moisture content determination in the step S1 is not used for the solidification stabilization test and the leaching toxicity test.
3. The lateritic nickel ore sludge solidification and stabilization treatment method according to claim 1, characterized in that: the stabilizing agent HKS-01 in step S32.
4. The lateritic nickel ore sludge solidification and stabilization treatment method according to claim 1, characterized in that: the error of the constant weight to the two weighing values in the step S1 is less than +/-1%.
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| CN113238000A (en) * | 2021-04-25 | 2021-08-10 | 中国电建集团西北勘测设计研究院有限公司 | Nondestructive construction waste leaching toxicity testing device and using method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113238000A (en) * | 2021-04-25 | 2021-08-10 | 中国电建集团西北勘测设计研究院有限公司 | Nondestructive construction waste leaching toxicity testing device and using method |
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Application publication date: 20200407 |