CN112279565B - Method for preparing mine filling material by using solid waste cemented heavy metal tailings in steel industry - Google Patents
Method for preparing mine filling material by using solid waste cemented heavy metal tailings in steel industry Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/006—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mineral polymers, e.g. geopolymers of the Davidovits type
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a method for preparing a mine filling material by using solid waste cemented heavy metal tailings in the steel industry, which comprises the following steps: s1, adding an alkali activator and an activating agent into the gel material by using the steel slag, the desulfurized ash and the slag as the gel material, and uniformly stirring to prepare a cementing agent; s2, adding a dispersing agent, a binder and a heavy metal curing agent into the heavy metal tailings, and uniformly stirring; and S3, uniformly stirring and mixing the cementing agent of S1 and the heavy metal tailings of S2 according to a certain proportion to prepare the mine filling material. According to the invention, the heavy metal tailings cemented by the solid wastes in the steel industry are used as the mine filling material instead of cement consolidated tailings, so that the mine filling cost is reduced, and the comprehensive utilization amount of the steel slag, the desulfurized ash and the bulk solid wastes of the tailings and the mechanical strength of the mine filling body are improved.
Description
Technical Field
The invention relates to resource utilization of industrial solid wastes in the steel industry, in particular to a method for preparing a mine filling material by cementing heavy metal tailings from the solid wastes in the steel industry.
Background
The steel slag is industrial waste slag generated in the steel making process in the steel industry, the resource utilization amount of the steel slag is limited by the factors of low gelling activity, poor grindability, poor volume stability and the like, the yield of the steel slag in China in 2018 reaches 1.2 hundred million tons, the historical stock quantity exceeds 10 million tons, and the comprehensive utilization rate of the steel slag is about 25 percent.
The desulfurized fly ash is industrial solid waste generated by adopting a semi-dry flue gas desulfurization technology in the steel industry, and the main component of the desulfurized fly ash is calcium sulfite (CaSO)3) Calcium sulfate (CaSO)4) Calcium sulfate hemihydrate (CaSO)4·0.5H2O) and ammonium salts, etc., CaSO3Is easily oxidized into calcium sulfate (CaSO) in an oxidant environment4) Because the comprehensive utilization rate of the desulfurized fly ash is low due to unstable properties of the desulfurized fly ash, most of the prior steel enterprises adopt a centralized accumulation mode to treat the desulfurized fly ash, occupy precious land resources and cause serious environmental pollution.
The tailings are produced by a series of processes of crushing, grinding, sorting and the like after raw ores enter a dressing plant, the residual parts which cannot be used for production are discharged in a slurry form, a large amount of tailings cannot be recycled, the tailings are accumulated in a tailing pond all the year round, precious land resources are occupied by the stockpiling, and heavy metals in the tailings permeate into surrounding soil, so that serious ecological environment pollution is caused.
At present, consolidation tailings serving as a mine filling material are a preferred method for rapidly and massively consuming tailings, cement is a first cementing agent for mine filling, but the cost of the mine filling material is increased due to the expensive price of the cement, the massive utilization of the tailings in the mine filling field is limited, and the heavy metal solidification/stabilization effect of the cement is poor when the heavy metal tailings are cemented, so that the utilization amount of the heavy metal tailings in the mine filling field is low, and therefore, the cementing agent with low preparation cost, high strength and good heavy metal solidification effect has important significance for improving the resource utilization amount of the heavy metal tailings.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for preparing a mine filling material by cementing heavy metal tailings from solid wastes in the steel industry, which replaces cement to solidify the tailings as a mine filling material, reduces the mine filling cost and improves the comprehensive utilization amount of the steel slag, desulfurized ash and bulk solid wastes of the tailings.
The invention is realized by the following steps:
the invention provides a method for preparing a mine filling material by using solid waste cemented heavy metal tailings in the steel industry, which comprises the following steps:
s1, adding an alkali activator and an activating agent into the gel material by using the steel slag, the desulfurized ash and the slag as the gel material, and uniformly stirring to prepare a cementing agent;
s2, adding a dispersing agent, a binder and a heavy metal curing agent into the heavy metal tailings, and uniformly stirring;
and S3, uniformly stirring and mixing the cementing agent of S1 and the heavy metal tailings of S2 according to a certain proportion to prepare the mine filling material.
The hydration activity of the steel slag and the slag is further excited by using a calcium sulfate component in the desulfurization ash as a sulfate exciting agent on the basis of alkali excitation to generate needle-shaped and thin rod-shaped ettringite (AFt), and the calcium sulfate component reacts with potential active minerals in the steel slag and the slag to generate hydraulic minerals such as calcium chloroaluminate, calcium aluminoferrite, calcium ferrocarbonate and the like with ettringite-like structures under the action of an activating agent.
C-S-H is a gel with a net structure and has good adsorption and cementation effects, the C-S-H is wrapped on the surfaces of the tailing particles to increase the adhesive force among the tailing particles, and meanwhile, the net C-S-H has a strong adsorption effect and can adsorb heavy metal ions to the surfaces of the C-S-H to play a role in fixing the heavy metals; the alkali activator and the calcium sulfate in the desulfurized fly ash can react with heavy metals to form precipitates, so that the toxicity of the heavy metals is reduced, the leaching rate of the heavy metal ions is reduced, and the effect of solidifying/stabilizing the heavy metals is achieved.
Calcium sulfite in the desulfurized fly ash is a good reducing agent, and high-toxicity hexavalent chromium (Cr) in heavy metal tailings6+) Has oxidizing property, and can convert low-toxicity trivalent chromium (Cr) under the action of calcium sulfite reducing agent3+) Meanwhile, calcium sulfite is converted into calcium sulfate, the calcium sulfate participates in hydration reaction to generate needle-shaped or fine rod-shaped AFt mineral, the particle size of desulfurized ash is fine and uniform, the calcium sulfite is an insoluble mineral and is filled in pores among tailings particles to adjust the grading of heavy metal tailings particles, so that the solidified heavy metal tailings show good fluidity; the desulfurized fly ash contains calcium sulfate and calcium sulfate hemihydrate, the crystal structure of which is formed by the loss of crystal water and has a diameter of
The pores have strong adsorption effect, and the heavy metal is adsorbed in the pores of the gypsum crystal and fixed in the dihydrate gypsum crystal to play a role in solidifying and stabilizing the heavy metal, so that the desulfurized fly ash plays multiple roles of a sulfate excitant, a reducing agent and heavy metal adsorption in the heavy metal tailing cementing agent.
The ettringite (AFt) mineral is in a needle-shaped or thin rod-shaped structure, a stable skeleton structure is formed by mutually overlapping in the consolidated tailing filler, and meanwhile, the AFt can penetrate into pores among the tailing particles to play a filling role, so that the porosity is reduced, the compactness is increased, the mechanical strength of the consolidated tailing filler is improved, and the leaching toxicity of heavy metals is reduced; ions in the AFt crystal are subjected to ion exchange with heavy metal ions, and the heavy metal ions are fixed in the stable AFt mineral, so that the leaching toxicity of the heavy metal is further reduced. Therefore, the cementing agent has the characteristics of good heavy metal solidification/stabilization effect, high mechanical strength of a filling body and good fluidity when used for cementing heavy metal tailings.
Uniformly stirring and mixing the gel material, the alkali activator and the activator, and feeding the mixture into a cementing agent bin; the tailings in the tailings bin enter a stirring bin to be uniformly stirred, corresponding dispersing agent, heavy metal curing agent and binder are added into the stirring bin to be uniformly mixed, and the heavy metal curing agent is added to be contacted with heavy metal in the tailings under the action of the dispersing agent; the cementing agent bin adds the cementing agent into the tailing stirring bin through a flowmeter and uniformly stirs; and then conveyed to an underground mine goaf through a conveying pipe.
Further, the gel material comprises the following components in parts by weight: 40-55% of slag, 25-40% of steel slag and 5-35% of desulfurized ash.
Furthermore, the weight ratio of the cementing agent of S1 and the heavy metal tailings stirred by S2 in the mine filling material is 1: 6-1: 5.
Further, in S1, after the steel slag is crushed and magnetically separated, the rest of the steel slag is ball-milled to prepare steel slag powder, the slag powder is ground to prepare slag powder, and the steel slag powder and the slag powder are sieved and mixed with desulfurized ash to prepare the gel material.
Further, the alkali activator is composed of one or more of calcium oxide, calcium hydroxide, carbide slag and caustic soda, and the mixing amount accounts for 1-5% of the weight of the cementing material.
Further, the dispersing agent is composed of one or more of sodium hexametaphosphate, sodium tripolyphosphate, trisodium phosphate, hydroxymethyl cellulose, calcium lignosulfonate, calcium saccharate and sodium lauryl sulfate, and the mixing amount accounts for 0.1-2% of the weight of the cementing material.
Further, the activating agent is composed of one or more of calcium chloride, aluminum chloride, ferric chloride, aluminum sulfate, mirabilite, triethanolamine, sodium nitrite, water glass, calcium carbonate, calcium formate, calcium acetate and aluminum sulfate, and the mixing amount of the activating agent accounts for 0.5-5% of the weight of the cementing material.
Furthermore, the binder is composed of one or more of polypropylene fiber and glass fiber, and the mixing amount of the binder accounts for 0.05-1% of the dry weight of the heavy metal tailings.
Further, the heavy metal curing agent is composed of one or more of calcium phosphate slag, phosphogypsum, zeolite, silica fume, plant ash, modified bentonite and ferric salt, and the mixing amount accounts for 0.2-3% of the dry weight of the heavy metal tailings.
The invention has the following beneficial effects:
1. the cementing material in the heavy metal tailing cementing agent is completely derived from waste slag in the steel industry, and the resource utilization amount of the steel slag and the desulfurized ash can be increased.
2. The cementing agent has rich raw material sources and low price, the steel slag and the slag in the raw materials are simply ground, the desulfurized fly ash is directly utilized without processing, and the production cost of the cementing agent can be obviously reduced compared with cement.
3. The heavy metal curing agent and the cementing agent are fully contacted with the heavy metal in the tailings under the action of the dispersing agent, so that the adsorption, precipitation and ion exchange effects of the cementing agent and the heavy metal curing agent on the heavy metal are improved.
4. The strength of the consolidated tailing of the cementing agent meets the requirement of mine filling strength under different conditions.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
The preparation method of mine filling by using industrial solid waste cemented heavy metal tailings in the steel industry comprises the following steps: the heavy metal tailing cementing agent is prepared from 50% of slag powder, 35% of steel slag powder, 15% of desulfurized ash, 4% of externally-doped alkali activator and 3% of activating agent by weight through mechanical stirring and mixing uniformly. The heavy metal tailings are firstly stirred and mixed with a dispersant, a binder and a heavy metal curing agent uniformly in a stirring bin, wherein the mixing amount of the dispersant accounts for 0.6 percent of the weight of the cementing material, the mixing amount of the binder accounts for 0.25 percent (accounting for the dry weight of the heavy metal tailings), and the mixing amount of the heavy metal curing agent accounts for 0.5 percent (accounting for the dry weight of the heavy metal tailings); the metering of the cementing agent in the mine filling material is the cementing agent: stirring the heavy metal tailings in a stirring bin to be uniform, testing the fluidity of the slurry by a fluidity testing instrument, filling the residual slurry into a 70.7mm test mould, putting the samples into a standard cement curing box for curing the compressive strength of the corresponding age test, taking three parallel samples from the compressive strength of each group of samples, taking the central part of a broken sample to ensure the data accuracy and the average value of the compressive strength of the three samples (the difference between the maximum value and the minimum value and the intermediate value is less than 15 percent), preparing a solid heavy metal tailing consolidation toxic leachate according to the requirements of a solid waste leaching toxicity leaching method-sulfuric acid-nitric acid method (HJT299-2007), and detecting the concentration of heavy metals in the leachate by using an inductively coupled plasma mass spectrometer (ICP-MS) in an inductively coupled plasma mass spectrometry (HJ766-2015) for measuring metal elements in solid waste.
Heavy metal leaching toxicity of heavy metal tailing filling material table 1
Mine filling material performance index Table 1
According to the table, the prepared heavy metal tailing cementing agent is used for consolidating heavy metal tailings to serve as a mine filling material, the heavy metal leaching concentration of the cementing agent consolidated heavy metal tailings serving as the mine filling material is lower than the underground III-class water index when the mine filling material is maintained for 7 days in a mortar ratio of 1:5, the heavy metal leaching concentration is gradually reduced when the maintenance time is prolonged, and the heavy metal leaching concentration of the filling material is obviously lower than the III-class underground water heavy metal limit value at 28 days; the compressive strength distribution of the consolidated heavy metal tailing mine filling materials 7d, 14d and 28d reaches 1.36MPa, 3.36MPa and 6.73MPa, and the compressive strength of the filling body 28d reaches 3MPa, so that the strength of the consolidated heavy metal tailing filling body of the cementing agent is far greater than the strength index of the mine filling body; the fluidity of the mine filling material is 276mm, different filling modes have different indexes on the fluidity of filling slurry, the fluidity of the slurry is more than or equal to 250mm when the mine filling adopts gravity flow conveying, and the fluidity of the pumping filling slurry is more than or equal to 180mm, but the pumping filling can increase the filling cost, so that the cementing agent prepared by the invention is used for consolidating the heavy metal tailings, is favorable for realizing the gravity flow conveying when being used for the mine filling, and further reduces the filling cost.
Example 2
The preparation method of mine filling by using industrial solid waste cemented heavy metal tailings in the steel industry comprises the following steps: the heavy metal tailing cementing agent is prepared from 43% of slag powder, 40% of steel slag powder, 17% of desulfurized ash, 3% of externally-doped alkali activator and 5% of activating agent through mechanical stirring and mixing uniformly according to the weight ratio. The heavy metal tailings are firstly stirred and mixed uniformly with a dispersing agent, a binder and a heavy metal curing agent in a stirring bin, and then a cementing agent is added in the tailing stirring bin, wherein the mixing amount of the dispersing agent accounts for 1.0 percent of the weight of the cementing material, the mixing amount of the binder accounts for 0.5 percent (accounting for the dry weight of the heavy metal tailings), and the mixing amount of the heavy metal curing agent accounts for 0.9 percent (accounting for the dry weight of the heavy metal tailings); the weight of the cementing agent in the mine filling material is as follows: stirring the heavy metal tailings in a stirring bin to be uniform, testing the fluidity of the slurry by a fluidity testing instrument, filling the residual slurry into a 70.7mm test mould, putting the samples into a standard cement curing box for curing the compressive strength of the corresponding age test, taking three parallel samples from the compressive strength of each group of samples, taking the central part of a broken sample to ensure the data accuracy and the average value of the compressive strength of the three samples (the difference between the maximum value and the minimum value and the intermediate value is less than 15 percent), according to the requirements of a solid waste leaching toxicity leaching method-sulfuric acid nitric acid method (HJT299-2007), a solid heavy metal tailing toxicity leaching solution is prepared, and an inductively coupled plasma mass spectrometer (ICP-MS) in an inductively coupled plasma mass spectrometry method (HJ766-2015) for measuring metal elements in solid waste is adopted to detect the concentration of heavy metals in the leaching solution.
Heavy metal leaching toxicity of heavy metal tailing filling material table 2
Mine filling material performance index table 2
According to the table, when the gel-to-sand ratio is 1:6, the heavy metal tailings are solidified to be used as a mine filling material, the leaching concentration of heavy metals is lower than that of underground III-type water during maintenance for 7d, the leaching concentration of heavy metals during filling of the solidified heavy metal tailings is gradually reduced along with the increase of the maintenance time, and the requirement of III-type underground water on the leaching concentration of heavy metals in the underground water quality standard (GB/T14848-2017) is met; the compressive strength distribution of the consolidated heavy metal tailing mine filling materials 7d, 14d and 28d reaches 1.05MPa, 2.68MPa and 5.06MPa, and the compressive strength of the filling body 28d reaches 3MPa, so that the strength of the consolidated heavy metal tailing filling body can meet the strength requirements of mine filling bodies at different parts, and therefore, the strength of the consolidated heavy metal tailing filling body is 1.68 times of the strength index of the mine filling body when the cement-sand ratio is 1: 6; the fluidity of the mine filling material is 267mm, different filling modes have different indexes on the fluidity of filling slurry, the fluidity of the slurry is more than or equal to 250mm when the mine filling adopts gravity flow conveying, and the fluidity of the pumping filling slurry is more than or equal to 180mm, but the pumping filling can increase the filling cost, so that the cementing agent prepared by the invention is used for consolidating the heavy metal tailings, is favorable for realizing the gravity flow conveying when being used for the mine filling, and further reduces the filling cost.
Example 3
The preparation method of mine filling by using industrial solid waste cemented heavy metal tailings in the steel industry comprises the following steps: the heavy metal tailing cementing agent is prepared from 40% of slag powder, 25% of steel slag powder, 35% of desulfurized ash, 5% of externally-doped alkali activator and 2% of activating agent by weight through mechanically stirring and uniformly mixing. The heavy metal tailings are firstly stirred and mixed uniformly with a dispersing agent, a binder and a heavy metal curing agent in a stirring bin, and then a cementing agent is added in the tailing stirring bin, wherein the mixing amount of the dispersing agent accounts for 0.3 percent of the weight of a cementing material, the mixing amount of the binder accounts for 1.0 percent (the dry weight of the heavy metal tailings), and the mixing amount of the heavy metal curing agent accounts for 1.2 percent (the dry weight of the heavy metal tailings); the weight of the cementing agent in the mine filling material is as follows: stirring the heavy metal tailings in a stirring bin to be uniform, testing the fluidity of the slurry by a fluidity testing instrument, filling the residual slurry into a 70.7mm test mould, putting the samples into a standard cement curing box for curing the compressive strength of the corresponding age test, taking three parallel samples from the compressive strength of each group of samples, taking the central part of a broken sample to ensure the data accuracy and the average value of the compressive strength of the three samples (the difference between the maximum value and the minimum value and the intermediate value is less than 15 percent), preparing a solid heavy metal tailing consolidation toxic leachate according to the requirements of a solid waste leaching toxicity leaching method-sulfuric acid-nitric acid method (HJT299-2007), and detecting the concentration of heavy metals in the leachate by using an inductively coupled plasma mass spectrometer (ICP-MS) in an inductively coupled plasma mass spectrometry (HJ766-2015) for measuring metal elements in solid waste.
Heavy metal leaching toxicity of heavy metal tailing filling material table 3
Mine filling material performance index Table 3
According to the table, when the gel-sand ratio is 1:5, the heavy metal tailings which are solidified and used as a mine filling material are lower than the index of underground III-type water in the heavy metal leaching concentration at 7d and 28d of maintenance, the heavy metal leaching concentration is increased in the maintenance age and is in a reduction trend, and the requirement of III-type underground water on the heavy metal leaching concentration in the underground water quality standard (GB/T14848-2017) is met; the compressive strength distribution of the consolidated heavy metal tailing mine filling materials 7d, 14d and 28d reaches 1.09MPa, 3.08MPa and 5.76MPa, and the compressive strength of the filling body 28d reaches 3MPa, so that the strength of the consolidated heavy metal tailing filling body can meet the strength requirements of mine filling bodies at different parts, therefore, the strength of the consolidated heavy metal tailing filling body is 1.92 times of the strength index of the mine filling body when the cement-sand ratio is 1: 5; the fluidity of the mine filling material is 265mm, different filling modes have different indexes on the fluidity of filling slurry, the fluidity of the slurry is more than or equal to 250mm when the mine filling adopts gravity flow conveying, and the fluidity of the pumping filling slurry is more than or equal to 180mm, but the pumping filling can increase the filling cost, so that the cementing agent prepared by the invention is used for consolidating the heavy metal tailings, is favorable for realizing the gravity flow conveying when being used for the mine filling, and further reduces the filling cost.
In order to reduce the mine filling cost, the invention uses the industrial solid wastes such as steel slag, desulfurized ash, tailings and the like as gel materials to prepare the cementing agent for cementing the heavy metal tailings as the mine filling material, and recycles the solid wastes in the steel industry.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The method for preparing the mine filling by using the solid waste cemented heavy metal tailings in the steel industry is characterized by comprising the following steps of:
s1, using the steel slag, the desulfurized ash and the slag as gel materials, wherein the gel materials comprise the following components in parts by weight: 40-55% of slag, 25-40% of steel slag and 5-35% of desulfurized ash, adding an alkali activator and an activating agent into the gel material, and uniformly stirring to prepare a cementing agent;
s2, adding a dispersing agent, a binder and a heavy metal curing agent into the heavy metal tailings, and uniformly stirring, wherein the binder is composed of one or more of polypropylene fibers and glass fibers, and the heavy metal curing agent is composed of one or more of calcium phosphate slag, phosphogypsum, plant ash, zeolite, modified bentonite and ferric salt;
s3, uniformly stirring and mixing the cementing agent of S1 and the heavy metal tailings stirred by S2 according to a certain proportion to prepare a mine filling material;
wherein, the gel material, the alkali excitant and the activator are stirred and mixed evenly and enter a cementing agent bin; the tail sand in the tail sand bin firstly enters a stirring bin to be uniformly stirred, and corresponding dispersing agent, heavy metal curing agent and binder are added into the stirring bin to be uniformly mixed; the cementing agent bin adds the cementing agent into the tailing stirring bin through a flowmeter and uniformly stirs; and then conveyed to an underground mine goaf through a conveying pipe.
2. The method for preparing the mine filling material by using the steel industry solid waste cemented heavy metal tailings as claimed in claim 1, wherein the method comprises the following steps: the weight ratio of the cementing agent of S1 and the heavy metal tailings stirred by S2 in the mine filling material is 1: 6-1: 5.
3. The method for preparing the mine filling material by using the steel industry solid waste cemented heavy metal tailings as claimed in claim 1, wherein the method comprises the following steps: and S1, crushing and magnetically separating the steel slag, performing ball milling on the residual steel slag to prepare steel slag powder, grinding the slag powder to prepare slag powder, sieving the steel slag powder and the slag powder, and mixing the sieved steel slag powder and the slag powder with desulfurized ash to prepare the gel material.
4. The method for preparing the mine filling material by using the steel industry solid waste cemented heavy metal tailings as claimed in claim 1, wherein the method comprises the following steps: the alkali activator is composed of one or more of calcium oxide, calcium hydroxide, carbide slag and caustic soda, and the mixing amount accounts for 1-5% of the weight of the cementing material.
5. The method for preparing the mine filling material by using the steel industry solid waste cemented heavy metal tailings as claimed in claim 1, wherein the method comprises the following steps: the dispersing agent is composed of one or more of sodium hexametaphosphate, sodium tripolyphosphate, trisodium phosphate, hydroxymethyl cellulose, calcium lignosulphonate, calcium saccharate and sodium lauryl sulfate, and the mixing amount accounts for 0.1-2% of the weight of the cementing material.
6. The method for preparing the mine filling material by using the steel industry solid waste cemented heavy metal tailings as claimed in claim 1, wherein the method comprises the following steps: the activating agent is composed of one or more of calcium chloride, aluminum chloride, ferric chloride, aluminum sulfate, mirabilite, triethanolamine, sodium nitrite, water glass, calcium carbonate, calcium formate, calcium acetate and aluminum sulfate, and the mixing amount accounts for 0.5-5% of the weight of the cementing material.
7. The method for preparing the mine filling material by using the steel industry solid waste cemented heavy metal tailings as claimed in claim 1, wherein the method comprises the following steps: the mixing amount of the adhesive is 0.05-1% of the dry weight of the heavy metal tailings.
8. The method for preparing the mine filling material by using the steel industry solid waste cemented heavy metal tailings as claimed in claim 1, wherein the method comprises the following steps: the heavy metal curing agent accounts for 0.2-3% of the dry weight of the heavy metal tailings.
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| PCT/CN2020/134298 WO2022057104A1 (en) | 2020-09-16 | 2020-12-07 | Method for preparing mine filling material using heavy metal tailings cemented by solid wastes in steel industry |
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