CN110510893B - Anti-oxidation barrier material and preparation method and application thereof - Google Patents
Anti-oxidation barrier material and preparation method and application thereof Download PDFInfo
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- CN110510893B CN110510893B CN201910762197.5A CN201910762197A CN110510893B CN 110510893 B CN110510893 B CN 110510893B CN 201910762197 A CN201910762197 A CN 201910762197A CN 110510893 B CN110510893 B CN 110510893B
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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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention discloses an anti-oxidation barrier material and a preparation method and application thereof, wherein the anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and an alkali activator, and the mass ratio of the tailings, the silicon-aluminum balancing agent and the alkali activator is 2-6: 2: 1. The preparation method of the anti-oxidation barrier material comprises the steps of grinding the tailings, adding the silicon-aluminum balancing agent into the grinded tailings, uniformly mixing, adding the alkali activator, and uniformly mixing to obtain a mud-like substance. The application is in the anti-oxidation treatment of the tailing pond, the anti-oxidation blocking material is uniformly covered on the surface of the tailing pond to form an anti-oxidation blocking layer, and the thickness of the anti-oxidation blocking layer is 3-5 cm. The invention realizes the isolation of the tailings from external moisture and air, prevents oxygen in water and air from contacting with sulfide components, and radically prevents the oxidation process of the tailings; the invention fully utilizes solid waste raw materials, and the main materials are obtained in situ, so that the engineering application only needs to bear labor and a little mechanical cost, and the economic investment is extremely low.
Description
Technical Field
The invention belongs to the technical field of tailing treatment, and particularly relates to an anti-oxidation barrier material and a preparation method and application thereof.
Background
Mine tailings are one of the problems which are always difficult to treat, and are pollution sources causing great environmental problems. According to statistics, the number of the existing large and medium-sized tailing ponds in China is more than 1500, and if various small-sized tailing ponds are added, the total number of the tailings ponds is more than 1 ten thousand. The harm is remarkable in acid tailing drainage, vegetation damage, land degradation, desertification, dust pollution, water body pollution and the like. The acid leachate is formed by the continuous reaction of sulfur-containing tailings and oxygen in the air under the action of rainwater, so that the pH of the tailings leachate is acidic (pH = 2-4), and sulfides in the tailings can be continuously oxidized over time, thereby continuously generating acid wastewater. Can dissolve out other associated metals in the tailings, such As Hg, Pb, As, Cd and the like, and cause pollution to downstream environment. Taking pyrite as an example, the chemical mechanism of formation of acidic wastewater is as follows:
most tailings contain various colored, black, rare and precious rare earth and nonmetallic minerals, which are precious secondary mineral resources and need to be further developed and recycled. The acid production by oxidation of the tailings not only leads to the dissolution of valuable metals, but also causes heavy burden on the environment. At present, no generally accepted and ideal method exists for treating the tailings field, and mainly comprises alkali liquor neutralization, ex-situ treatment or tailing development building material reduction of tailing stock, but the methods can only achieve the effect for a while and cannot fundamentally solve the problem of tailing oxidation.
At present, the oxidation problems of tailings field reservoirs mainly comprise passivation treatment, a chemical neutralization method, a physical isolation method, plant restoration and the like, for example, a method for on-site in-situ protection of powdery metal sulfide tailings (CN 106623354B) and an ecological restoration method for layered coverage of gold mine tailings (CN 109731903A), and the methods generally have the problems of high investment cost, poor long-term effect and incapability of thoroughly and long-term solving the problems of the tailings. Aiming at the problems, it is urgent to find a product which is easy to implement, low in cost and good in effect.
Disclosure of Invention
The first purpose of the invention is to provide an anti-oxidation barrier material.
The second purpose of the invention is to provide a preparation method of the anti-oxidation barrier material.
The third purpose of the invention is to provide an application of the anti-oxidation barrier material in anti-oxidation treatment of a tailing pond.
The first purpose of the invention is realized by the method, which comprises tailings, a silicon-aluminum balancing agent and an alkali activator, wherein the mass ratio of the tailings, the silicon-aluminum balancing agent and the alkali activator is 2-6: 2: 1.
The second purpose of the invention is realized by grinding the tailings, adding the silicon-aluminum balancing agent into the grinded tailings and uniformly mixing, adding the alkali activator and uniformly mixing to obtain a paste.
The third purpose of the invention is realized by uniformly covering the anti-oxidation barrier material on the surface of the tailing pond to form an anti-oxidation barrier layer with the thickness of 3-5 cm.
Compared with the prior art, the invention has the following technical effects:
1. the anti-oxidation barrier material is prepared from tailings, a silicon-aluminum balancing agent and an alkali activator in a ratio, and OH is utilized under the condition of high pH-The Si-O bond in the network structure of the silicon-aluminum material can be rapidly broken, so that the silicon-rich phase is rapidly dissolved, meanwhile, some aluminum which replaces silicon and exists in the silicon-rich phase is dissolved and re-polymerized, and finally, a hardening barrier layer with higher hardness and lower water permeability coefficient is rapidly formed, so that the tailings are isolated from external moisture and air, the contact of oxygen in water and air with sulfide components is prevented, and the oxidation process of the tailings is fundamentally prevented;
2. the anti-oxidation barrier material completely utilizes solid waste raw materials, the main material is obtained in situ, the engineering application only needs to bear labor and a little mechanical cost, and the economic investment is extremely low;
3. the anti-oxidation barrier material uses the red mud solution as an alkali activator, so that the alkalinity of the red mud is effectively utilized, solid waste resources are reasonably utilized, the pressure of the red mud on the environment is reduced, and the slow-release alkali which is difficult to dissolve out in the crystal lattice of the anti-oxidation barrier material can be used as a long-time acid-base buffer agent of a tailing pond due to the particularity of the red mud;
4. when the anti-oxidation barrier material is applied to the anti-oxidation treatment of a tailing pond, high-temperature maintenance is not needed, and the anti-oxidation barrier material can be formed only by normal-temperature waterproof maintenance, so that the process flow is simplified, and the maintenance cost is reduced; the anti-oxidation barrier layer formed by the anti-oxidation barrier material on the surface of the tailing pond guarantees low water seepage coefficient and high hardness, can provide long-time isolation protection for the tailing pond, can be used for earthing cultivation above the barrier layer, is beneficial to ecological restoration of the tailing pond, has the effects of preventing poplar dust and reinforcing old pond bodies, reduces dust pollution caused by the tailing pond, and reduces the threat of collapse of the pond bodies.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to be limiting in any way, and any modifications or alterations based on the teachings of the present invention are intended to fall within the scope of the present invention.
The composite material comprises tailings, a silicon-aluminum balancing agent and an alkali activator, wherein the mass ratio of the tailings to the silicon-aluminum balancing agent to the alkali activator is 2-6: 2: 1.
Preferably, the anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and an alkali activator, and the mass ratio of the silicon-aluminum balancing agent to the alkali activator is 3-5: 2: 1.
The reaction mechanism of the anti-oxidation barrier material is as follows:
chemical hydration reaction:
physical electrostatic reaction:
condensation polymerization of ion pairs condensation with each other:
preferably, the fineness modulus of the tailings is less than 3.0, and the fineness modulus is calculated by the following formula:
MX=[(A0.15+A0.3+A0.6+A1.18+A2.36)-5A4.75]/(100-A4.75)，
wherein MX is fineness modulus, A0.15 is cumulative percent of oversize on particle with particle size of 0.15mm, A0.3 is cumulative percent of oversize on particle with particle size of 0.30mm, A0.6 is cumulative percent of oversize on particle with particle size of 0.60mm, A1.18 is cumulative percent of oversize on particle with particle size of 1.18mm, A2.36 is cumulative percent of oversize on particle with particle size of 2.36mm, and A4.75 is cumulative percent of oversize on particle with particle size of 4.75 mm.
Preferably, the silicon-aluminum balancing agent comprises silicon ash and fly ash in a mass ratio of 1: 2.5-3.5.
Preferably, the alkali activator is a red mud solution, and the concentration is not lower than 10 g/L.
The preparation method of the anti-oxidation barrier material comprises the steps of grinding the tailings, adding the silicon-aluminum balancing agent into the grinded tailings, uniformly mixing, adding the alkali activator, and uniformly mixing to obtain a paste.
The application of the anti-oxidation blocking material in the anti-oxidation treatment of the tailing pond is characterized in that the anti-oxidation blocking material is uniformly covered on the surface of the tailing pond to form an anti-oxidation blocking layer, and the thickness of the anti-oxidation blocking layer is 3-5 cm.
Preferably, the method further comprises maintaining, wherein after the maintaining, the covering is rain-proof and stands still for at least 5 days under the normal temperature condition.
The present invention will be further described with reference to examples 1 to 42.
Example 1
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and an alkali activator, wherein the mass ratio of the tailings, the silicon-aluminum balancing agent and the alkali activator is 2:2: 1.
Example 2
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and an alkali activator, and the mass ratio of the silicon-aluminum balancing agent to the alkali activator is 6:2: 1.
Example 3
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and an alkali activator, wherein the mass ratio of the tailings, the silicon-aluminum balancing agent and the alkali activator is 3:2: 1.
Example 4
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and an alkali activator, wherein the mass ratio of the tailings, the silicon-aluminum balancing agent and the alkali activator is 5:2: 1.
Example 5
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and an alkali activator, and the mass ratio of the silicon-aluminum balancing agent to the alkali activator is 4:2: 1.
Example 6
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and an alkali activator, the mass ratio is 2:2:1, and the fineness modulus of the tailings is 2.99.
Example 7
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and an alkali activator, the mass ratio is 6:2:1, and the fineness modulus of the tailings is 2.7.
Example 8
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and an alkali activator, the mass ratio is 3:2:1, and the fineness modulus of the tailings is 2.5.
Example 9
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and an alkali activator, the mass ratio is 5:2:1, and the fineness modulus of the tailings is 0.1.
Example 10
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and an alkali activator, wherein the mass ratio of the silicon-aluminum balancing agent to the alkali activator is 4:2:1, and the fineness modulus of the tailings is 1.5.
Example 11
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and an alkali activator, wherein the mass ratio of the tailings to the alkali activator is 2:2:1, the fineness modulus of the tailings is 2.99, and the silicon-aluminum balancing agent comprises silica fume and fly ash, and the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1: 2.5.
Example 12
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and an alkali activator, wherein the mass ratio of the tailings to the alkali activator is 6:2:1, the fineness modulus of the tailings is 2.7, and the silicon-aluminum balancing agent comprises silica fume and fly ash, and the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1: 3.5.
Example 13
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and an alkali activator, wherein the mass ratio of the tailings to the alkali activator is 3:2:1, the fineness modulus of the tailings is 2.5, and the silicon-aluminum balancing agent comprises silica fume and fly ash, and the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1: 2.5.
Example 14
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and an alkali activator, wherein the mass ratio of the tailings to the alkali activator is 5:2:1, the fineness modulus of the tailings is 0.1, and the silicon-aluminum balancing agent comprises silica fume and fly ash, and the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1: 3.5.
Example 15
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and an alkali activator, wherein the mass ratio of the tailings to the alkali activator is 4:2:1, the fineness modulus of the tailings is 1.5, and the silicon-aluminum balancing agent comprises silica fume and fly ash, and the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1:3.
Example 16
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and a red mud solution, wherein the mass ratio of the tailings to the silicon-aluminum balancing agent is 2:2:1, the fineness modulus of the tailings is 2.99, the silicon-aluminum balancing agent comprises silicon ash and fly ash, the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1:2.5, and the concentration of the red mud solution is 10 g/L.
Example 17
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and a red mud solution, wherein the mass ratio of the tailings to the silicon-aluminum balancing agent is 6:2:1, the fineness modulus of the tailings is 2.7, the silicon-aluminum balancing agent comprises silicon ash and fly ash, the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1:3.5, and the concentration of the red mud solution is 12 g/L.
Example 18
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and a red mud solution, wherein the mass ratio of the tailings to the silicon-aluminum balancing agent is 3:2:1, the fineness modulus of the tailings is 2.5, the silicon-aluminum balancing agent comprises silicon ash and fly ash, the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1:2.5, and the concentration of the red mud solution is 15 g/L.
Example 19
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and a red mud solution, wherein the mass ratio of the tailings to the silicon-aluminum balancing agent is 5:2:1, the fineness modulus of the tailings is 0.1, the silicon-aluminum balancing agent comprises silicon ash and fly ash, the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1:3.5, and the concentration of the red mud solution is 18 g/L.
Example 20
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and a red mud solution, wherein the mass ratio of the tailings to the silicon-aluminum balancing agent is 4:2:1, the fineness modulus of the tailings is 1.5, the silicon-aluminum balancing agent comprises silicon ash and fly ash, the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1:3, and the concentration of the red mud solution is 20 g/L.
Example 21
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and a red mud solution, wherein the mass ratio of the tailings to the red mud solution is 2:2:1, the fineness modulus of the tailings is 2.5, and the silicon-aluminum balancing agent comprises silicon ash and fly ash, and the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1:3.
Example 22
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and a red mud solution, wherein the mass ratio of the tailings to the red mud solution is 4:2:1, the fineness modulus of the tailings is 2.5, and the silicon-aluminum balancing agent comprises silica fume and fly ash, and the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1:3.
Example 23
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and a red mud solution, wherein the mass ratio of the tailings to the red mud solution is 6:2:1, the fineness modulus of the tailings is 2.5, and the silicon-aluminum balancing agent comprises silicon ash and fly ash, and the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1:3.
Example 24
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and a red mud solution, wherein the mass ratio of the tailings to the red mud solution is 2:2:1, the fineness modulus of the tailings is 3.0, and the silicon-aluminum balancing agent comprises silica fume and fly ash, and the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1:3.
Example 25
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and a red mud solution, wherein the mass ratio of the tailings to the red mud solution is 4:2:1, the fineness modulus of the tailings is 3.0, and the silicon-aluminum balancing agent comprises silica fume and fly ash, and the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1:3.
Example 26
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and a red mud solution, wherein the mass ratio of the tailings to the red mud solution is 6:2:1, the fineness modulus of the tailings is 3.0, and the silicon-aluminum balancing agent comprises silica fume and fly ash, and the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1:3.
Example 27
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and a red mud solution, wherein the mass ratio of the tailings to the red mud solution is 2:2:1, the fineness modulus of the tailings is 2.7, and the silicon-aluminum balancing agent comprises silicon ash and fly ash, and the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1:3.
Example 28
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and a red mud solution, wherein the mass ratio of the tailings to the red mud solution is 4:2:1, the fineness modulus of the tailings is 2.7, and the silicon-aluminum balancing agent comprises silica fume and fly ash, and the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1:3.
Example 29
The anti-oxidation barrier material comprises tailings, a silicon-aluminum balancing agent and a red mud solution, wherein the mass ratio of the tailings to the red mud solution is 6:2:1, the fineness modulus of the tailings is 2.7, and the silicon-aluminum balancing agent comprises silicon ash and fly ash, and the mass ratio of the silicon-aluminum balancing agent to the fly ash is 1:3.
Example 30
According to the anti-oxidation barrier material and the preparation method of the anti-oxidation barrier material in the embodiment 1, the tailings are ground, then the silicon-aluminum balancing agent is added into the grinded tailings and uniformly mixed, and then the alkali activator is added and uniformly mixed to obtain a mud-like substance.
Example 31
According to the anti-oxidation barrier material and the preparation method of the anti-oxidation barrier material in the embodiment 7, the tailings are ground until the fineness modulus of the tailings is 2.7, then the silicon-aluminum balancing agent is added into the grinded tailings and uniformly mixed, and then the alkali activator is added and uniformly mixed to obtain a mud-like substance.
Example 32
According to the anti-oxidation barrier material and the preparation method of the anti-oxidation barrier material of the embodiment 13, firstly, the tailings are ground until the fineness modulus of the tailings is 2.5, then, the silicon-aluminum balancing agent is added into the grinded tailings and uniformly mixed, and then, the alkali activator is added and uniformly mixed to obtain a mud-like substance;
uniformly covering the prepared mud-like material anti-oxidation barrier material on the surface of the tailing pond to form an anti-oxidation barrier layer with the thickness of 3cm, and after covering, keeping the tailing pond in a rain-proof state at normal temperature for 5 days.
Example 33
According to the anti-oxidation barrier material and the preparation method of the anti-oxidation barrier material of the embodiment 20, firstly, the tailings are ground until the fineness modulus of the tailings is 1.5, then, the silicon-aluminum balancing agent is added into the grinded tailings and uniformly mixed, and then, the red mud solution is added and uniformly mixed to obtain a sludge-like substance;
uniformly covering the prepared mud-like material anti-oxidation barrier material on the surface of the tailing pond to form an anti-oxidation barrier layer with the thickness of 3cm, and after covering, keeping the tailing pond in a rain-proof state at normal temperature and standing for 6 days.
Example 34
According to the anti-oxidation barrier material and the preparation method of the anti-oxidation barrier material of the embodiment 21, firstly, the tailings are ground until the fineness modulus of the tailings is 2.5, then, the silicon-aluminum balancing agent is added into the grinded tailings and uniformly mixed, and then, the red mud solution is added and uniformly mixed to obtain a sludge-like substance;
uniformly covering the prepared mud-like material anti-oxidation barrier material on the surface of the tailing pond to form an anti-oxidation barrier layer with the thickness of 3cm, and after covering, keeping the tailing pond in a rain-proof state at normal temperature and standing for 7 days.
Example 35
According to the anti-oxidation barrier material and the preparation method of the anti-oxidation barrier material of the embodiment 22, firstly, the tailings are ground until the fineness modulus of the tailings is 2.5, then, the silicon-aluminum balancing agent is added into the grinded tailings and uniformly mixed, and then, the red mud solution is added and uniformly mixed to obtain a sludge-like substance;
uniformly covering the prepared mud-like material anti-oxidation barrier material on the surface of the tailing pond to form an anti-oxidation barrier layer with the thickness of 5cm, and after covering, keeping the tailing pond in a rain-proof state at normal temperature and standing for 7 days.
Example 36
According to the anti-oxidation barrier material and the preparation method of the anti-oxidation barrier material of the embodiment 23, firstly, the tailings are ground until the fineness modulus of the tailings is 2.5, then, the silicon-aluminum balancing agent is added into the grinded tailings and uniformly mixed, and then, the red mud solution is added and uniformly mixed to obtain a sludge-like substance;
and uniformly covering the prepared mud-like material anti-oxidation barrier material on the surface of the tailing pond to form an anti-oxidation barrier layer with the thickness of 4cm, and after covering, keeping the tailing pond in a rain-proof state at normal temperature and standing for 7 days.
Example 37
According to the anti-oxidation barrier material and the preparation method of the anti-oxidation barrier material of the embodiment 24, firstly, the tailings are ground until the fineness modulus of the tailings is 3.0, then, the silicon-aluminum balancing agent is added into the grinded tailings and uniformly mixed, and then, the red mud solution is added and uniformly mixed to obtain a sludge-like substance;
uniformly covering the prepared mud-like material anti-oxidation barrier material on the surface of the tailing pond to form an anti-oxidation barrier layer with the thickness of 3cm, and after covering, keeping the tailing pond in a rain-proof state at normal temperature and standing for 7 days.
Example 38
According to the anti-oxidation barrier material and the preparation method of the anti-oxidation barrier material of the embodiment 25, firstly, the tailings are ground until the fineness modulus of the tailings is 3.0, then, the silicon-aluminum balancing agent is added into the grinded tailings and uniformly mixed, and then, the red mud solution is added and uniformly mixed to obtain a sludge-like substance;
uniformly covering the prepared mud-like material anti-oxidation barrier material on the surface of the tailing pond to form an anti-oxidation barrier layer with the thickness of 5cm, and after covering, keeping the tailing pond in a rain-proof state at normal temperature and standing for 7 days.
Example 39
According to the anti-oxidation barrier material and the preparation method of the anti-oxidation barrier material of the embodiment 26, firstly, the tailings are ground until the fineness modulus of the tailings is 3.0, then, the silicon-aluminum balancing agent is added into the grinded tailings and uniformly mixed, and then, the red mud solution is added and uniformly mixed to obtain a sludge-like substance;
uniformly covering the prepared mud-like material anti-oxidation barrier material on the surface of the tailing pond to form an anti-oxidation barrier layer with the thickness of 3cm, and after covering, keeping the tailing pond in a rain-proof state at normal temperature and standing for 7 days.
Example 40
According to the anti-oxidation barrier material and the preparation method of the anti-oxidation barrier material of the embodiment 27, firstly, the tailings are ground until the fineness modulus of the tailings is 2.7, then, the silicon-aluminum balancing agent is added into the grinded tailings and uniformly mixed, and then, the red mud solution is added and uniformly mixed to obtain a sludge-like substance;
uniformly covering the prepared mud-like material anti-oxidation barrier material on the surface of the tailing pond to form an anti-oxidation barrier layer with the thickness of 5cm, and after covering, keeping the tailing pond in a rain-proof state at normal temperature and standing for 7 days.
EXAMPLE 41
According to the anti-oxidation barrier material and the preparation method of the anti-oxidation barrier material of the embodiment 28, firstly, the tailings are ground until the fineness modulus of the tailings is 2.7, then, the silicon-aluminum balancing agent is added into the grinded tailings and uniformly mixed, and then, the red mud solution is added and uniformly mixed to obtain a sludge-like substance;
and uniformly covering the prepared mud-like material anti-oxidation barrier material on the surface of the tailing pond to form an anti-oxidation barrier layer with the thickness of 4cm, and after covering, keeping the tailing pond in a rain-proof state at normal temperature and standing for 7 days.
Example 42
According to the anti-oxidation barrier material and the preparation method of the anti-oxidation barrier material of the embodiment 29, firstly, the tailings are ground until the fineness modulus of the tailings is 2.7, then, the silicon-aluminum balancing agent is added into the grinded tailings and uniformly mixed, and then, the red mud solution is added and uniformly mixed to obtain a sludge-like substance;
and uniformly covering the prepared mud-like material anti-oxidation barrier material on the surface of the tailing pond to form an anti-oxidation barrier layer with the thickness of 4cm, and after covering, keeping the tailing pond in a rain-proof state at normal temperature and standing for 7 days.
The tailings ponds in the embodiments 34 to 42 belong to historical residual tin tailings ponds which are piled in the open air all year around, and sulfur elements in the tailings are easily oxidized by air and react with moisture in the environment to generate sulfuric acid to form acid leachate; after the tailings are treated for 7 days according to the embodiments 34 to 42, the water permeability coefficient, the hardness and the acid corrosion resistance of the anti-oxidation barrier layer are detected according to a conventional method, and the detection results are shown in table 1.
TABLE 1 detection results of oxidation-preventing barrier layer
As can be seen from the table 1, the waterproof, acid-resistant and hardness performances of the invention are good, and the water seepage test piece is not penetrated, so that the water seepage can be effectively prevented; the hardness and the acid corrosion resistance performance are excellent, and the soil can bear sufficient soil for cultivation greening and long-term acid and oxidation resistance protection.
Claims (3)
1. The anti-oxidation barrier material is characterized by comprising tailings, a silicon-aluminum balancing agent and an alkali activator, wherein the mass ratio of the tailings, the silicon-aluminum balancing agent and the alkali activator is 2-6: 2:1, the silicon-aluminum balancing agent comprises silicon ash and fly ash, the mass ratio of the silicon ash and the fly ash is 1: 2.5-3.5, the alkali activator is a red mud solution, and the concentration of the alkali activator is not lower than 10 g/L;
the preparation method of the anti-oxidation barrier material comprises the steps of grinding the tailings, adding a silicon-aluminum balancing agent into the grinded tailings, uniformly mixing, adding an alkali activator, and uniformly mixing to obtain a paste;
and uniformly covering the surface of the tailing pond with the anti-oxidation barrier material, and after covering, preventing rain at normal temperature and standing for at least 5 days to form an anti-oxidation barrier layer with the thickness of 3-5 cm.
2. The anti-oxidation barrier material of claim 1, which is characterized by comprising tailings, a silicon-aluminum balancing agent and an alkali activator in a mass ratio of 3-5: 2: 1.
3. The anti-oxidation barrier material of claim 1 or 2, wherein the fineness modulus of the tailings is less than 3.0, and the fineness modulus is calculated by the following formula:
MX=[(A0.15+A0.3+A0.6+A1.18+A2.36)-5A4.75]/(100-A4.75)，
wherein MX is fineness modulus, A0.15 is cumulative percent of oversize on particle with particle size of 0.15mm, A0.3 is cumulative percent of oversize on particle with particle size of 0.30mm, A0.6 is cumulative percent of oversize on particle with particle size of 0.60mm, A1.18 is cumulative percent of oversize on particle with particle size of 1.18mm, A2.36 is cumulative percent of oversize on particle with particle size of 2.36mm, and A4.75 is cumulative percent of oversize on particle with particle size of 4.75 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910762197.5A CN110510893B (en) | 2019-08-19 | 2019-08-19 | Anti-oxidation barrier material and preparation method and application thereof |
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Application publication date: 20191129 Assignee: Huanze energy saving and environmental protection technology Yunnan Co.,Ltd. Assignor: Kunming University of Technology Asset Management Co.,Ltd. Contract record no.: X2022530000008 Denomination of invention: A kind of anti oxidation barrier material and its preparation method and application Granted publication date: 20201225 License type: Common License Record date: 20221228 |
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