CN113354223A - Curing agent and method for curing black and odorous bottom mud - Google Patents
Curing agent and method for curing black and odorous bottom mud Download PDFInfo
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- CN113354223A CN113354223A CN202110589138.XA CN202110589138A CN113354223A CN 113354223 A CN113354223 A CN 113354223A CN 202110589138 A CN202110589138 A CN 202110589138A CN 113354223 A CN113354223 A CN 113354223A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 46
- 239000010802 sludge Substances 0.000 claims abstract description 35
- 239000002131 composite material Substances 0.000 claims abstract description 26
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 24
- 239000000654 additive Substances 0.000 claims abstract description 23
- 230000000996 additive effect Effects 0.000 claims abstract description 21
- 239000002440 industrial waste Substances 0.000 claims abstract description 21
- 239000002893 slag Substances 0.000 claims abstract description 19
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 11
- 239000000440 bentonite Substances 0.000 claims abstract description 11
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 11
- 239000010440 gypsum Substances 0.000 claims abstract description 11
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 10
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 10
- 239000004571 lime Substances 0.000 claims abstract description 10
- 239000002699 waste material Substances 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 7
- 239000010959 steel Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims description 14
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 claims description 7
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 7
- 238000007711 solidification Methods 0.000 claims description 7
- 230000008023 solidification Effects 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 10
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 8
- 239000002994 raw material Substances 0.000 abstract description 5
- 239000000758 substrate Substances 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000004566 building material Substances 0.000 abstract description 2
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 238000001723 curing Methods 0.000 description 46
- 230000000052 comparative effect Effects 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000011790 ferrous sulphate Substances 0.000 description 8
- 235000003891 ferrous sulphate Nutrition 0.000 description 8
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 8
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 8
- 230000001590 oxidative effect Effects 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 239000007800 oxidant agent Substances 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 229910052593 corundum Inorganic materials 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 235000019353 potassium silicate Nutrition 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical group OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000000498 ball milling Methods 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- MGGVALXERJRIRO-UHFFFAOYSA-N 4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]-2-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-1H-pyrazol-5-one Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C=1C(=NN(C=1)CC(=O)N1CC2=C(CC1)NN=N2)O MGGVALXERJRIRO-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- AGWMJKGGLUJAPB-UHFFFAOYSA-N aluminum;dicalcium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Ca+2].[Ca+2].[Fe+3] AGWMJKGGLUJAPB-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 229910000281 calcium bentonite Inorganic materials 0.000 description 1
- 235000012241 calcium silicate Nutrition 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000011507 gypsum plaster Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 239000002085 irritant Substances 0.000 description 1
- 231100000021 irritant Toxicity 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000000050 nutritive effect Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
-
- 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
- C02F11/145—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances using calcium compounds
-
- 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
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Abstract
The invention provides a curing agent and a method for curing black and odorous substrate sludge, which comprise the following components in parts by weight: 60-64 parts of industrial waste, 16-20 parts of additive and 18-22 parts of ferrosilicon composite flocculant; the industrial waste comprises blast furnace ironmaking waste slag and/or converter steel slag, and the additive is lime, gypsum and bentonite. The invention has the following beneficial effects: the invention adopts the ferrosilicon composite flocculant to remove heavy metals in sludge, uses blast furnace ironmaking waste residue and steelmaking slag with gelling property to generate hydraulic substances, and simultaneously uses the additives which take lime, gypsum and bentonite as raw materials to further enhance hardness and passivate heavy metals, while the powdery curing agent further improves reaction efficiency and curing effect, the components are reasonable in proportion and simple to use, the strength of the sludge after subsequent curing treatment can reach over 1200kPa, and the heavy metal removal effect is excellent, so that the sludge can be recycled as building materials.
Description
Technical Field
The field belongs to the field of environmental protection, and particularly relates to a curing agent and a method for curing black bottom mud.
Background
The treatment is an important component of water environment treatment, and if the release of pollutants in the bottom mud cannot be effectively controlled, the water environment treatment cannot achieve good effect. The bottom mud contains a large amount of pollutants such as nitrogen and phosphorus nutritive salts, organic matters and the like, the oxygen consumption of the organic matters is larger than that of reoxygenation in the decomposition process, so that the water body is in an anoxic environment, and anaerobic microorganisms decompose the organic matters to generate a large amount of irritant gases such as methane, hydrogen sulfide, ammonia and the like, so that the water body is black and smelly. At present, the bottom mud is treated by adopting a mechanical dredging method, so that the endogenous pollution of the bottom mud is reduced, the black and odorous bottom mud is not subjected to subsequent treatment, and the secondary pollution is easily caused.
In order to avoid the above problems, studies are now being made to develop a method for solidifying black and odorous bottom mud into a material capable of being recycled. The Chinese patent with the application number of 202011023732.4 discloses a low-alkalinity environment-friendly curing agent for river and lake dredging bottom mud and a use method thereof, the curing agent is prepared from a plurality of components including a main curing agent, a solidification assistant, a regulator, a crystal nucleus agent, a saturated agent, an early strength agent, a flocculating agent and a dispersing agent, and although the pH value of the treated sludge is reduced, the cured sludge treated by the curing agent has low strength; similarly, chinese patent No. 20091057515.1 discloses a sludge and sludge curing agent, which uses carbide slag and slag as gel main bodies as curing agents to achieve the purpose of saving cost, but the sludge treated by the curing agents still has a problem of low strength, which causes obstacles for subsequent resource utilization.
Disclosure of Invention
In order to solve the technical problems, the invention provides a curing agent and a method for curing black and odorous bottom mud.
The specific technical scheme is as follows:
the curing agent is characterized by comprising the following components in parts by weight: 60-64 parts of industrial waste, 16-20 parts of additive and 18-22 parts of ferrosilicon composite flocculant;
the industrial waste comprises blast furnace ironmaking waste slag and/or converter steel slag, and the additive is lime, gypsum and bentonite; the industrial waste and the additive are in powder form.
Further, the ferrosilicon composite flocculant has a ferrosilicon molar ratio of Si to Fe (0.1-0.5) to 1, an alkalization degree of 0.5-2, and a pH value range of 2-6.
Further, the specific surface area of the industrial waste and the additive is 350m2/kg～600m2/kg。
Further, the silicon iron composite flocculant comprises gamma-methacryloxypropyltrimethoxysilane and polyferric silicate sulfate, wherein the mass ratio of the gamma-methacryloxypropyltrimethoxysilane to the polyferric silicate sulfate is (0.03-0.06): 1.
furthermore, the polyferric silicate sulfate is prepared by mixing water glass and ferrous sulfate and then adding an oxidant for reaction.
Further, the paint comprises the following components in parts by weight: 60 parts of industrial waste, 20 parts of additive and 20 parts of ferrosilicon composite flocculant.
Further, the mass ratio of the lime to the gypsum to the bentonite is 14:4: 2.
The preparation method of the curing agent is characterized in that the industrial waste is mixed with the additive and then crushed to obtain the solid base; and mixing the solid base with the ferrosilicon composite flocculant.
Further, the preparation method of the ferrosilicon flocculant comprises the following steps:
mixing water glass and ferrous sulfate according to a molar ratio (0.1-0.5): 1, mixing, and adding water to dissolve; then, adding an oxidant to oxidize ferrous sulfate, wherein the molar ratio of the ferrous sulfate to the oxidant is (0.8-1): 1, so as to obtain a ferric polysilicate solution; and finally, mixing the ferric polysilicate solution and gamma-methacryloxypropyl trimethoxy silane according to the weight ratio of (0.03-0.06): 1, and then uniformly stirring until the alkalization degree is 0.5-2 and the pH value is 5.6 to obtain the composite flocculant mixed solution.
Further, the oxidant is H2O2。
The sludge solidification method is characterized by comprising the following steps: mixing the curing agent and the sludge according to the proportion of 1: (0.8-3.2) and curing after mixing.
Further, the curing agent and the sludge are mixed according to the proportion of 1: (0.8-2.0) in a mass ratio.
Further, the curing agent is mixed with the sludge and then cured and cured for 7 to 14 days at normal temperature.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention adopts the ferrosilicon composite flocculant to remove heavy metals in sludge, uses blast furnace ironmaking waste residue and steelmaking slag with gelling property to generate hydraulic substances, and simultaneously uses the additives which take lime, gypsum and bentonite as raw materials to further enhance hardness and passivate heavy metals, while the powdery curing agent further improves reaction efficiency and curing effect, the proportion of each component is simple and reasonable, the use is simple, the strength of the sludge after subsequent curing treatment can reach more than 1200kPa, and the heavy metal removal effect is excellent, thus the sludge can be recycled as building materials.
(2) When the mass ratio of lime, gypsum and bentonite is 14:4:2, the water content of the bottom mud can be rapidly reduced, so that the curing strength can be further improved.
(3) The specific surface area of the industrial waste and the additive is 350m2/kg～600m2At kg, the hydration activity is best, further reducing free water in the treated sludge and further improving the solidification strength.
(4) The ferrosilicon composite flocculant has the ferrosilicon molar ratio of Si to Fe (0.1-0.5) to 1, the alkalization degree of 0.5-2 and the pH value range of 2-6, has the best stability and higher polymerization degree, so that the flocculation effect is good, and the metal removal rate can be further improved.
(5) When 60 parts of industrial waste, 20 parts of additive and 20 parts of ferrosilicon composite flocculant are used as curing agents, the strength of the treated sludge can be further improved.
Detailed Description
The present invention is further described in detail below with reference to specific examples so that those skilled in the art can more clearly understand the present invention.
The following examples are provided only for illustrating the present invention and are not intended to limit the scope of the present invention. All other embodiments obtained by a person skilled in the art based on the specific embodiments of the present invention without any inventive step are within the scope of the present invention.
In the examples of the present invention, all the raw material components are commercially available products well known to those skilled in the art, unless otherwise specified; in the examples of the present invention, unless otherwise specified, all technical means used are conventional means well known to those skilled in the art.
In the present invention, the raw materials involved are described below:
the converter steel slag is prepared from Wuhan Steel Limited company (Wuhan Steel for short) and has CaO and SiO as main chemical components2、Al2O3、FeO、Fe2O3、MnO、MgO、P2O5Metallic Fe and a cement-like mineral component comprising: dicalcium silicate (C2S), tricalcium silicate (C3S) and small amount of tricalcium aluminate (C3A), tetracalcium aluminoferrite (C4AF), etc., among which CaO, SiO, as main active ingredients2、Al2O3The ratio of (A) to (B) is 38.98 wt%, 14.93 wt% and 5.45 wt% respectively.
The ironmaking waste slag is from Wuhan Steel Limited company (Wuhan Steel for short), and the main chemical components of the ironmaking waste slag are CaO and SiO2、Al2O3And MgO, MnO, Fe2O3And the like. CaO and SiO as main active components2、Al2O3The ratio of (A) to (B) is respectively 38.6% wt, 33.9% wt and 15.3% wt.
In the present invention, the gypsum is desulfurized gypsum (purchased from Shandong Xin hong Yue chemical Co., Ltd.)
In the invention, the bentonite is calcium bentonite (purchased from processing factory for transporting mineral products in Hebei river)
The water content of the black and odorous substrate sludge is 85.3 wt%, and the organic matter content is 10.7 wt%.
Example 1
The embodiment provides a ferrosilicon composite flocculant, and the specific preparation method is as follows:
(1) mixing water glass and ferrous sulfate, adding the mixture into a reaction container, and adding a proper amount of water for dissolving, wherein the molar ratio of the water glass to the ferrous sulfate is (0.1-0.5): 1.
(2) adding oxidant H under stirring2O2And (3) oxidizing, namely completely oxidizing the ferrous sulfate to prepare a polymeric ferric silicate sulfate solution, wherein the molar ratio of the ferrous sulfate to the hydrogen peroxide is 1: 1.
(3) and mixing the obtained polymeric ferric silicate sulfate solution and gamma-methacryloxypropyl trimethoxy silane according to the mass ratio of 0.05:1, and uniformly stirring until the alkalization degree is 0.5-2 and the pH value is 5.6 to obtain a composite flocculant mixed solution.
Examples 2 to 3
Embodiments 2 to 3 provide a curing agent, and the specific preparation method is as follows:
putting the weighed industrial waste and the additive into a planetary ball mill for grinding to obtain a solid base; and compounding the ground solid base with a ferrosilicon composite flocculant to obtain the ferrosilicon composite flocculant. The industrial waste includes industrial waste including blast furnace ironmaking slag and/or converter steel slag. The additive is lime, gypsum and bentonite, the mol ratio of ferrosilicon of the ferrosilicon composite flocculant is Si: Fe (0.1-0.5): 1, the alkalization degree is 0.5-2, the pH value range is 2-6, and the additive is selected from one or more of gamma-methacryloxypropyl trimethoxy silane, ferric sulfate and active polysilicic acid. The weight parts of the components, the ball milling time and the specific surface area are shown in table 1.
Table 1 examples 2-3 curing agent raw material compounding information
| Example 2 | Example 3 | |
| Blast furnace iron-smelting waste slag | 40 | 40 |
| Basicity coefficient of blast furnace ironmaking waste slag | 1.04 | 1.15 |
| Converter steel slag | 20 | 20 |
| Basicity coefficient of steel slag | 1.90 | 1.87 |
| Lime | 14 | 11.2 |
| Gypsum plaster | 4 | 3.2 |
| Bentonite clay | 2 | 1.6 |
| Silicon iron composite flocculant | 20 | 20 |
| Alkalization degree of silicon iron composite flocculant | 0.5～2 | 0.5～2 |
| pH value of silicon iron composite flocculant | 5.6 | 5.6 |
| Ball milling time (min) | 30 | 60 |
| Specific surface area (m)2/kg) | 400 | 560 |
Examples 4 to 7
Embodiments 4 to 7 provide a method for curing black and odorous bottom mud, which comprises the following steps:
the curing agent in example 2 and the black and odorous bottom mud are uniformly stirred according to the mass ratio in the table 2, and are kept at the normal temperature for 7 days.
TABLE 2 EXAMPLES 4 TO 7 MIXING QUALITY RATIO OF SOLIDIFYING AGENT AND BLACK-ODORY BASE MUD
| Curing agent: black and odorous bottom mud | |
| Examples4 | 2.5：8 |
| Example 5 | 3.75:7 |
| Example 6 | 5:6 |
| Example 7 | 6.25:5 |
Examples 8 to 11
Embodiments 8 to 11 provide a method of curing black and odorous bottom mud, which comprises the following steps:
the curing agent in example 3 and the black and odorous bottom mud are uniformly stirred according to the mass ratio in the table 3, and are kept at the normal temperature for 14 days.
TABLE 3 mixing ratio by mass of the curing agent and the black and odorous bottom sludge in examples 8 to 11
| Curing agent: black and odorous bottom mud | |
| Example 8 | 2.5：8 |
| Example 9 | 3.75:7 |
| Example 10 | 5:6 |
| Example 11 | 6.25:5 |
Comparative example 1
The comparative example provides a method for curing black and odorous substrate sludge, which comprises the following specific steps:
the curing agent in the example 1 and the black and odorous bottom mud are uniformly stirred according to the mass ratio of 7.5:4, and are kept at the normal temperature for 7 days.
Comparative example 2
The comparative example provides a method for curing black and odorous substrate sludge, which comprises the following specific steps:
the curing agent in the example 2 and the black and odorous bottom mud are uniformly stirred according to the mass ratio of 7.5:4, and are kept at normal temperature for 14 days.
Example 12
The cured strength of the black and odorous bottom mud of the examples 4 to 11 and the comparative examples 1 to 2 is tested according to the GB/T50081-2019 concrete physical and mechanical property test method standard, and the test results are shown in Table 4.
TABLE 4 curing Strength of examples and comparative examples of Black and odorous bottom mud
| Curing method | Strength (kPa) |
| Example 4 | 1235 |
| Example 5 | 1660 |
| Example 6 | 1580 |
| Example 7 | 1375 |
| Example 8 | 1330 |
| Example 9 | 1367.5 |
| Example 10 | 1460 |
| Example 11 | 1585 |
| Comparative example 1 | 980 |
| Comparative example 2 | 1030.5 |
Examples 4 to 11 and comparative examples 1 to 2 the content of heavy metals in black odorous bottom mud was measured by the horizontal oscillation method of the solid waste leaching toxicity leaching method of HJ 557-2010, and the results are shown in table 5.
TABLE 5 heavy metals of examples and comparative examples of black and odorous substrate sludge
Examples 4 to 7 differ from comparative example 1 and examples 8 to 11 differ from comparative example 2 in that the curing agent and sludge are used in a ratio of 1: (0.8-3.2), and as can be seen from Table 5, the solidification strength of the treated sludge is higher than that of comparative examples 1 and 2, and can reach 1200 kPa.
The curing agent and the sludge are mixed according to the proportion of 1: (0.8 to 2.0) in the above-mentioned mass ratio, the curing strength can be further improved to 1300 kPa.
In combination with the metal removal effect of table 5, the curing agent and sludge were mixed as follows: (1.2 to 2.0) is more excellent in the combination of the curing strength and the metal removal effect.
When the curing agent comprises the following 60 parts of industrial waste, 20 parts of additive and 20 parts of ferrosilicon composite flocculant, the strength of the cured sludge is better, and the removal rate of Cr and Pb is better; when the curing agent comprises 60 parts of industrial waste, 16 parts of additive and 20 parts of ferrosilicon composite flocculant, the removal effect of As, Ni, Cu, Cd and Zn metals is better.
It should be noted that the above examples are only for further illustration and description of the technical solution of the present invention, and are not intended to further limit the technical solution of the present invention, and the method of the present invention is only a preferred embodiment, and is not intended to limit the protection scope of the present 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 (10)
1. The curing agent is characterized by comprising the following components in parts by weight: 60-64 parts of industrial waste, 16-20 parts of additive and 18-22 parts of ferrosilicon composite flocculant;
the industrial waste comprises blast furnace ironmaking waste slag and/or converter steel slag, and the additive is lime, gypsum and bentonite; the industrial waste and the additive are in powder form.
2. The curing agent according to claim 1, wherein the ferrosilicon composite flocculant has a ferrosilicon molar ratio of Si to Fe (0.1-0.5) to 1, an alkalization degree of 0.5-2, and a pH value of 2-6.
3. The curing agent according to claim 1, wherein the specific surface area of the industrial waste to the additive is 350m2/kg～600m2/kg。
4. The curing agent according to claim 1 or 2, wherein the silicon-iron composite flocculant comprises gamma-methacryloxypropyltrimethoxysilane and polyferric silicate sulfate, and the mass ratio of the gamma-methacryloxypropyltrimethoxysilane to the polyferric silicate sulfate is (0.03-0.06): 1.
5. the curing agent according to claim 1, which comprises the following components in parts by weight: 60 parts of industrial waste, 20 parts of additive and 20 parts of ferrosilicon composite flocculant.
6. The sludge solidification method according to claim 1, wherein the mass ratio of lime, gypsum and bentonite is 14:4: 2.
7. The method for producing the curing agent according to any one of claims 1 to 6, wherein the industrial waste is mixed with the additive and then pulverized to obtain the solid base; and mixing the solid base with the ferrosilicon composite flocculant.
8. The sludge solidification method is characterized by comprising the following steps: mixing the curing agent of any one of claims 1 to 6 with sludge in a ratio of 1: (0.8-3.2) and curing after mixing.
9. The sludge solidification method as claimed in claim 8, wherein the solidifying agent is mixed with the sludge in a ratio of 1: (0.8-2.0) in a mass ratio.
10. The method for solidifying sludge according to claim 8, wherein the solidifying agent is mixed with the sludge and then cured and solidified for 7 to 14 days at normal temperature.
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