CN115925377A - Steel slag-based curing agent and application thereof in curing of nickel-containing contaminated soil - Google Patents
Steel slag-based curing agent and application thereof in curing of nickel-containing contaminated soil Download PDFInfo
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- CN115925377A CN115925377A CN202211363745.5A CN202211363745A CN115925377A CN 115925377 A CN115925377 A CN 115925377A CN 202211363745 A CN202211363745 A CN 202211363745A CN 115925377 A CN115925377 A CN 115925377A
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 162
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 80
- 239000002893 slag Substances 0.000 title claims abstract description 63
- 239000002689 soil Substances 0.000 title claims abstract description 56
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 53
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 53
- 239000010959 steel Substances 0.000 title claims abstract description 53
- 239000000843 powder Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 17
- 239000004568 cement Substances 0.000 claims description 16
- 229910052602 gypsum Inorganic materials 0.000 claims description 9
- 239000010440 gypsum Substances 0.000 claims description 9
- 238000007711 solidification Methods 0.000 claims description 8
- 230000008023 solidification Effects 0.000 claims description 8
- JCBJVAJGLKENNC-UHFFFAOYSA-M potassium ethyl xanthate Chemical compound [K+].CCOC([S-])=S JCBJVAJGLKENNC-UHFFFAOYSA-M 0.000 claims description 7
- 229910000281 calcium bentonite Inorganic materials 0.000 claims description 6
- 229910052925 anhydrite Inorganic materials 0.000 claims description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical group [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 4
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 claims description 4
- 238000005056 compaction Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- RZFBEFUNINJXRQ-UHFFFAOYSA-M sodium ethyl xanthate Chemical compound [Na+].CCOC([S-])=S RZFBEFUNINJXRQ-UHFFFAOYSA-M 0.000 claims description 2
- WPZFNRZRCODGMX-UHFFFAOYSA-L zinc;ethoxymethanedithioate Chemical compound [Zn+2].CCOC([S-])=S.CCOC([S-])=S WPZFNRZRCODGMX-UHFFFAOYSA-L 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 10
- 239000002910 solid waste Substances 0.000 abstract description 9
- 239000000126 substance Substances 0.000 abstract description 9
- 239000002699 waste material Substances 0.000 abstract description 8
- 238000011065 in-situ storage Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000000087 stabilizing effect Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 2
- 230000005012 migration Effects 0.000 abstract 1
- 238000013508 migration Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 12
- 238000002156 mixing Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 6
- 238000002386 leaching Methods 0.000 description 6
- 150000002816 nickel compounds Chemical class 0.000 description 6
- 230000008439 repair process Effects 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 description 4
- 229910001453 nickel ion Inorganic materials 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 241000209094 Oryza Species 0.000 description 3
- 235000007164 Oryza sativa Nutrition 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 238000003321 atomic absorption spectrophotometry Methods 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- CCIVGXIOQKPBKL-UHFFFAOYSA-M ethanesulfonate Chemical compound CCS([O-])(=O)=O CCIVGXIOQKPBKL-UHFFFAOYSA-M 0.000 description 3
- 239000011133 lead Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- ZODDGFAZWTZOSI-UHFFFAOYSA-N nitric acid;sulfuric acid Chemical compound O[N+]([O-])=O.OS(O)(=O)=O ZODDGFAZWTZOSI-UHFFFAOYSA-N 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 235000009566 rice Nutrition 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 230000001988 toxicity Effects 0.000 description 3
- 231100000419 toxicity Toxicity 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 102000016938 Catalase Human genes 0.000 description 1
- 108010053835 Catalase Proteins 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical group O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- 230000005802 health problem Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000003621 irrigation water Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 230000005180 public health Effects 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000002786 root growth Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/02—Apparatus for removing ash, clinker, or slag from ash-pits, e.g. by employing trucks or conveyors, by employing suction devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
- F23J2900/01005—Mixing water to ash
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Processing Of Solid Wastes (AREA)
- Gasification And Melting Of Waste (AREA)
Abstract
The invention discloses a steel slag-based curing agent and application thereof in curing nickel-containing polluted soil. The steel slag-based curing agent comprises the following components: the steel slag-based curing agent is used for curing nickel-containing polluted soil, and can play a role in curing and stabilizing nickel from multiple dimensions in a physical adsorption-chemical complexation-physical wrapping mode, so that the in-situ space threshold of heavy metal nickel is realized, the migration rate of nickel is greatly reduced, the stability of nickel curing is enhanced, and the steel slag-based curing agent mainly adopts solid wastes as raw materials, so that the purpose of treating waste by waste is achieved, and the steel slag-based curing agent has great economic and environmental benefits.
Description
Technical Field
The invention relates to a soil in-situ curing agent, in particular to a steel slag-based curing agent and application thereof in curing of nickel-containing polluted soil, belonging to the technical field of environmental protection.
Background
Nickel is one of eight major elements causing soil heavy metal pollution, and the overproof rate of nickel pollution in China is 4.8 percent and is only second to cadmium according to the survey bulletin of national soil pollution conditions. The artificial sources of nickel in the soil mainly include mining of metal minerals, metal smelting, combustion of fossil fuels, application of pesticides and chemical fertilizers, vehicle waste gas emission, treatment of house removal wastes, stacking and incineration of garbage, atmosphere settlement and the like. Some nickel carried by sewage and sludge generated in life and industrial production is used as irrigation water or fertilizer in agricultural production, so that nickel is accumulated in crops, and further accumulated in human bodies through the crops, and human health problems are caused. Liushixiang, etc. by applying high concentration Ni stress to rice, the rice shows hindered root growth, reduced Catalase Activity (CAT) and soluble protein, and O 2 The generation rate and the relative conductivity are improved, and the series of phenomena show that the growth of the rice is obviously inhibited under the Ni stress. However, nickel is also not easily migrated, is difficult to degrade, and can accumulate in soil for a long time, which results in increasing nickel concentration in soil, and in serious cases, directly causes economic loss and public health incidents. In view of the universality and the harmfulness of nickel and compounds thereof, the research on the effective repair technology of nickel pollution is very slow, and has extremely important significance.
At present, attention on nickel-contaminated soil is relatively low, so that technical development and material research and development on nickel-contaminated soil remediation are low, and from the property of nickel, a stable nickel compound is lacked, and the nickel compound cannot be effectively fixed by a chemical combination method, so that the invention of a new material for curing and stabilizing nickel-contaminated soil is urgent.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a steel slag-based curing agent for curing nickel-containing contaminated soil. The steel slag-based curing agent can effectively adsorb nickel in soil, and can limit the activity space of the nickel through a space threshold, so that the mobility of the steel slag-based curing agent is greatly reduced, the pollution of free nickel to the surrounding environment is reduced, and the steel slag-based curing agent adopts a large amount of solid wastes in raw materials, so that the problem of accumulation of the solid wastes is alleviated, and the aim of treating wastes with processes of wastes against one another is fulfilled.
The second purpose of the invention is to provide an application of the steel slag-based curing agent, the steel slag-based curing agent is used for curing nickel-containing contaminated soil, the purposes of effectively reducing the mobility of nickel in the nickel-containing contaminated soil and reducing the pollution of free to the surrounding environment are achieved by absorbing nickel and limiting the activity space, the application method is simple to operate and convenient to implement, and the nickel-containing contaminated soil cured by the curing agent has certain mechanical strength, can be used as a building material or an industrial raw material, and has the effect of changing waste into valuable.
In order to realize the technical purpose, the invention provides a steel slag-based curing agent, which comprises the following components in percentage by mass:
30-35% of steel slag powder;
25-30% of slag powder;
14 to 18 percent of gypsum;
6 to 9 percent of cement clinker;
1 to 3 percent of excitant;
10 to 15 percent of calcium bentonite;
1-3% of ethyl xanthate;
the steel slag in the steel slag-based curing agent can not only play the role of an active base material, but also absorb a large amount of nickel due to the fact that the steel slag contains a large amount of iron oxide. The steel slag, the gypsum, the cement clinker and the excitant can also be used as micro-aggregates to generate hydraulic cementing compounds, thereby increasing the compactness of a solidified body, reducing the porosity of the solidified body and reducing the mobility of nickel in polluted soil.
As a preferable scheme, the steel slag powder contains a large amount of ferrite compounds, and the iron oxide has a magnetic adsorption effect on elemental nickel and a chemical adsorption effect on nickel compounds, so that nickel in soil can be rapidly enriched, and subsequent operation is facilitated.
As a preferred scheme, the slag powder is S95 grade. The slag powder contains a large amount of oxides of silicon, aluminum and calcium, and can form a network-shaped gelled skeleton when combined with soil.
In a preferred embodiment, the gypsum is anhydrite. The anhydrite has two functions, namely, under the condition of the existence of moisture, hydroxide radicals can be combined to generate a compound with gelling property, and the effect of solidifying the polluted soil is achieved; secondly, a large amount of calcium ions can be provided at the initial stage of the solidification reaction to further adsorb nickel in soil in cooperation with iron oxide compounds in the steel slag powder.
In a preferred embodiment, the activator is a thioaluminate.
As a preferred scheme, the cement clinker is 32.5 cement clinker. The cement clinker has very high activity and can promote the quick reaction of the curing agent.
As a preferred embodiment, the ethyl xanthate is at least one of sodium ethyl xanthate, potassium ethyl xanthate, and zinc ethyl xanthate. Nickel mainly exists in a free state in soil, on one hand, a stable nickel compound cannot be formed due to the active property of a nickel compound, and on the other hand, a nickel simple substance is also active in chemical property and can be oxidized in humid air to be changed into the nickel compound to be migrated again. And S in the ethylsulfonate is a coordination atom and can be combined with nickel ions to form sulfide precipitate, and when the nickel ions are combined with the ethylsulfonate, a stable complex can be formed.
The invention also provides an application method of the curing agent, which is applied to curing of the nickel-containing contaminated soil.
As a preferable scheme, after the nickel-containing contaminated soil and the steel slag-based curing agent are uniformly stirred, rolling compaction and maintenance are carried out.
As a preferable scheme, the mass ratio of the nickel-containing polluted soil to the steel slag-based curing agent is 88-97: 3 to 12.
As a preferred scheme, the particle size of the curing agent is 80 μm, and the screen allowance is less than 1 percent; the water content of the curing agent is less than 5 percent.
The main mechanism of the steel slag-based curing agent for curing the nickel-containing contaminated soil is as follows:
the nickel-containing polluted soil contains a certain amount of moisture and has larger gaps, so that the soil is soft and a humid environment, and the nickel is active in the humid and air environment, so that the nickel is difficult to form a stable compound with substances in the soil so as to be fixed.
First, steel slag contains a large amount of ferrite compounds, which can adsorb nickel ions, thereby enriching nickel. The calcium-based modified bentonite unit crystal structure consists of 2 silica tetrahedrons with one aluminum oxide octahedron sandwiched between, and in the crystal structure, low-valence cations Ca 2+ Will react with the expensive A1 3+ 、Si 4+ Isomorphous displacement occurs, resulting in an excess negative charge in the crystalline layer, which results in chemisorption of nickel ions. Finally, the ethyl sulfonate can form stable complex precipitate with the enriched nickel, so as to encapsulate the nickel.
Secondly, after solid waste particles such as steel slag powder, slag powder and the like are added, a gelling reaction can occur, so that the soil density is improved, the void ratio is reduced, and physical coating is formed on nickel. In addition, anhydrite can convert a portion of the free water in the soil to bound water, thereby reducing the free water content in the soil and reducing the fluidity of the nickel from the transmission medium. Therefore, the cage structure is constructed according to the mode of physical adsorption, chemical complexation and physical wrapping through the synergistic effect of the components, so that the in-situ spatial threshold of the nickel is realized, and the nickel is fixed.
Compared with the prior art, the technical scheme of the invention has the following beneficial technical effects:
1) The steel slag-based curing agent provided by the invention can play a role in curing and stabilizing nickel from multiple dimensions in a physical adsorption-chemical complexation-physical wrapping mode, so that the in-situ spatial threshold of nickel is realized, the mobility of nickel is greatly reduced, and the curing stability of nickel is enhanced.
2) The application method of the steel slag-based curing agent provided by the invention has the advantages of short curing period, high efficiency, simple and easy process and the like. And the blending amount of the curing agent is lower in engineering application, so that the compatibilization ratio after curing can be greatly reduced.
3) The raw materials adopted by the invention have wide sources, wherein more than 70 percent of the raw materials are from solid wastes, thereby not only effectively solving the solidification problem of the soil polluted by nickel, greatly reducing the mobility of nickel, but also effectively relieving the environmental pollution problem caused by stacking of industrial waste residues, and achieving the purpose of treating wastes with processes of wastes against one another. In addition, the solid waste is adopted as the raw material, so that the cost is reduced, and the economic benefit is further improved.
Drawings
FIG. 1 shows the mechanism of immobilization of potassium ethylxanthate on nickel.
Detailed Description
In order to better explain the invention, the invention is further illustrated with reference to specific examples, but the invention is not limited to the following examples.
The solidification effect test of soil nickel in the following examples and comparative examples is carried out according to the following standards: taking a cured sample at a preset age after curing, and measuring the concentration of nickel in the leachate according to a leachate prepared by a solid waste leaching toxicity leaching method sulfuric acid-nitric acid method (HJ/T299-2007) procedure, and adopting a flame atomic absorption spectrophotometry (HJ 491-2019) for measuring copper, zinc, lead, nickel and chromium in soil and sediments. The results are as follows.
Example 1
1. The preparation of the steel slag-based curing agent comprises the following steps: step one, weighing 32% of steel slag powder, 27% of slag powder, 17% of gypsum, 7% of cement clinker, 2% of excitant, 13% of calcium bentonite and 2% of potassium ethylxanthate according to the mass percentage of each component. Controlling the water content of the raw materials within 5 percent, fully mixing the weighed steel slag powder, cement clinker and excitant, grinding the mixture to a certain fineness by using a ball mill, wherein the standard of the fineness is that the sieve residue of 80 mu m is less than 1 percent; and step two, mixing the calcium bentonite and the potassium ethylxanthate to obtain the curing agent.
2. The repair application of the nickel-containing polluted soil comprises the following steps: uniformly mixing a curing agent with each nickel-containing contaminated soil according to the mass ratio (dry weight) of 7.
Table 1 example 1 nickel concentration after treatment of contaminated soil
Example 2
1. The preparation of the steel slag-based curing agent comprises the following steps: step one, weighing 35% of steel slag powder, 30% of slag powder, 15% of gypsum, 6% of cement clinker, 2% of excitant, 11% of calcium bentonite and 1% of potassium ethylxanthate according to the mass percentage of the components. Controlling the water content of the raw materials within 5 percent, fully mixing the weighed steel slag powder, cement clinker and excitant, grinding the mixture to a certain fineness by using a ball mill, wherein the standard of the fineness is that the sieve residue of 80 mu m is less than 1 percent; and step two, mixing the calcium bentonite and the potassium ethylxanthate to obtain the curing agent.
2. The repair application of the nickel-containing polluted soil comprises the following steps: uniformly mixing the curing agent with the nickel-containing contaminated soil according to the mass ratio (dry weight) of 8.
Solidification effect of soil nickel: taking a cured sample at a preset age after curing, and measuring the concentration of nickel in the leachate according to a leachate prepared by a solid waste leaching toxicity leaching method sulfuric acid-nitric acid method (HJ/T299-2007) procedure, and adopting a flame atomic absorption spectrophotometry (HJ 491-2019) for measuring copper, zinc, lead, nickel and chromium in soil and sediments. The results are as follows.
Table 3 example 3 nickel concentration after contaminated soil treatment
Comparative example 1
1. The preparation of the steel slag-based curing agent comprises the following steps: step one, weighing 38% of steel slag powder, 32% of slag powder, 19% of gypsum, 8% of cement clinker and 3% of excitant according to the mass percentage of each component. The water content of the raw materials is controlled within 5 percent, the weighed steel slag powder, cement clinker and exciting agent are fully mixed, ground by a ball mill to a certain fineness, and the fineness is reduced to a standard that the screen residue with the fineness of 80 mu m is less than 1 percent, so that the curing agent can be obtained.
2. The repair application of the nickel-containing polluted soil comprises the following steps: uniformly mixing the curing agent with the nickel-containing contaminated soil according to the mass ratio (dry weight) of 7.
Table 2 example 2 nickel concentration after treatment of contaminated soil
Comparative example 2
1. The preparation of the steel slag-based curing agent comprises the following steps: step one, weighing 40% of steel slag powder, 34% of slag powder, 17% of gypsum, 7% of cement clinker and 2% of excitant according to the mass percentage of each component. The water content of the raw materials is controlled within 5 percent, the weighed steel slag powder, cement clinker and exciting agent are fully mixed, ground by a ball mill to a certain fineness, and the fineness is reduced to a standard that the screen residue with the fineness of 80 mu m is less than 1 percent, so that the curing agent can be obtained.
2. The repair application of the nickel-containing polluted soil comprises the following steps: uniformly mixing the curing agent with the nickel-containing contaminated soil according to the mass ratio (dry weight) of 8.
Solidification effect of soil nickel: taking a cured sample at a preset age after curing, and measuring the concentration of nickel in the leachate according to a leachate prepared by a solid waste leaching toxicity leaching method sulfuric acid-nitric acid method (HJ/T299-2007) procedure, and adopting a flame atomic absorption spectrophotometry (HJ 491-2019) for measuring copper, zinc, lead, nickel and chromium in soil and sediments. The results are as follows.
Table 4 example 4 nickel concentration after treatment of contaminated soil
Claims (9)
1. The steel slag-based curing agent is characterized in that: comprises the following components in percentage by mass:
30-35% of steel slag powder;
25-30% of slag powder;
10 to 18 percent of gypsum;
6 to 9 percent of cement clinker;
1 to 3 percent of excitant;
10 to 15 percent of calcium bentonite;
1 to 3 percent of ethyl xanthate.
2. The steel slag-based curing agent according to claim 1, wherein: the slag powder is S95 grade.
3. The steel slag-based curing agent according to claim 1, wherein: the gypsum is anhydrite.
4. The steel slag-based curing agent according to claim 1, wherein: the excitant is sulphoaluminate.
5. The steel slag-based curing agent according to claim 1, wherein: the cement clinker is 32.5 cement clinker.
6. The steel slag-based curing agent according to claim 1, wherein: the ethyl xanthate is at least one of sodium ethyl xanthate, potassium ethyl xanthate and zinc ethyl xanthate.
7. Use of the steel slag-based curing agent according to any one of claims 1 to 6, wherein: the method is applied to the solidification of the nickel-containing polluted soil.
8. Use of a steel slag-based solidification agent according to claim 7, wherein: and (3) uniformly stirring the nickel-containing polluted soil and the steel slag-based curing agent, and then carrying out rolling compaction and maintenance.
9. Use of a steel slag-based solidification agent according to claim 8, wherein: the mass ratio of the nickel-containing polluted soil to the steel slag-based curing agent is 88-97: 3 to 12.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2022101367718 | 2022-02-15 | ||
| CN202210136771 | 2022-02-15 |
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| Publication Number | Publication Date |
|---|---|
| CN115925377A true CN115925377A (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211363745.5A Pending CN115925377A (en) | 2022-02-15 | 2022-11-02 | Steel slag-based curing agent and application thereof in curing of nickel-containing contaminated soil |
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| Country | Link |
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| CN (1) | CN115925377A (en) |
| DE (1) | DE202022103000U1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN112851283A (en) * | 2021-01-27 | 2021-05-28 | 中钢集团马鞍山矿山研究总院股份有限公司 | Cementing material capable of solidifying and stabilizing heavy metal ions in tailings |
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2022
- 2022-05-29 DE DE202022103000.6U patent/DE202022103000U1/en active Active
- 2022-11-02 CN CN202211363745.5A patent/CN115925377A/en active Pending
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| EP0496148A2 (en) * | 1991-01-19 | 1992-07-29 | Takuma Research And Development Co., Ltd. | Improvements in the treatment of ashes |
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| CN112851283A (en) * | 2021-01-27 | 2021-05-28 | 中钢集团马鞍山矿山研究总院股份有限公司 | Cementing material capable of solidifying and stabilizing heavy metal ions in tailings |
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