CN110563421A - Method for treating red mud by using soil curing agent - Google Patents
Method for treating red mud by using soil curing agent Download PDFInfo
- Publication number
- CN110563421A CN110563421A CN201910751355.7A CN201910751355A CN110563421A CN 110563421 A CN110563421 A CN 110563421A CN 201910751355 A CN201910751355 A CN 201910751355A CN 110563421 A CN110563421 A CN 110563421A
- Authority
- CN
- China
- Prior art keywords
- red mud
- soil
- solidifying agent
- cement
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
-
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention relates to a method for treating red mud by using a soil stabilizer. Through a series of performance tests of unconfined compressive strength, freeze-thaw resistance, water stability and the like, the result shows that the pavement base layer has good performance, has more superior performance in the aspects of compressive strength, deflection value and the like compared with the traditional process, and has the advantages of improving quality, reducing manufacturing cost, saving energy, protecting environment and the like. Can be widely applied to the field of civil engineering, and greatly improves the additional value of the red mud.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a method for treating red mud by using a soil curing agent.
Background
At present, with the development of aluminum industry and the reduction of bauxite grade, the red mud amount is getting larger and larger all over the country, and the red mud is reprocessed and utilized, so that the waste is changed into valuable and the pollution is reduced. The red mud is piled up in a yard, and is piled up in a damming wet method in alumina factories at home and abroad, and the solution is returned for reuse by natural sedimentation and separation. The method can easily cause a large amount of waste alkali liquor to permeate into nearby lands, so that the soil is alkalized and swamped, and ground surface and underground water sources are polluted. And the red mud is dried, dehydrated and then stockpiled in a dry method. The two methods not only occupy a large amount of land, but also can not reasonably utilize a plurality of available components in the red mud, thereby causing secondary waste of resources. Due to the continuous increase of wastes in the world, red mud causes more and more economic and environmental problems, and along with the attention of China on environmental protection work, the alumina industry is urgently required to realize harmless discharge or zero discharge.
Bauxite is directly dissolved, separated, crystallized and roasted after being calcined at high temperature to obtain alumina, and the discharged slurry-like waste residue forms Bayer process red mud. The red mud treatment process is complicated due to the strict requirements on the red mud treatment production line. During the dissolving process, strong alkali is used to dissolve out bauxite of boehmite type and gibbsite type with high content of aluminum and iron, and the red mud produced has high content of alumina, iron oxide and alkali. In particular, hexavalent chromium contained in the red mud has toxicity. In the prior art, the treatment process is unreasonable, and the treatment effect is not ideal.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a method for treating red mud by using a soil curing agent, and a series of performance tests such as unconfined compressive strength, freeze-thaw resistance, water stability and the like show that the pavement base layer has good performance, has more superior performance in the aspects of compressive strength, deflection value and the like compared with the traditional process, and has the advantages of improving quality, reducing manufacturing cost, saving energy, protecting environment and the like. Can be widely applied to the field of civil engineering, and greatly improves the additional value of the red mud.
The technical scheme for solving the technical problems is as follows:
a method for treating red mud by using a soil curing agent comprises the following steps: and mixing the soil curing agent, the cementing material and the red mud to obtain a mixture.
The invention has the beneficial effects that: the soil curing agent is adopted to change the physical and chemical components of the original red mud. The method can solve the problems of large pollution and difficult treatment of the red mud, is not only beneficial to the protection and improvement of local natural environment, but also beneficial to the promotion of local economic development and the maintenance of sustainable and steady development of mining industry. Meanwhile, the technology for treating the red mud by using the soil stabilizer is actively carried out, so that the method has the characteristics of economic benefit, environmental benefit and social benefit, low investment, high benefit, convenience in operation, strong adaptability, reproducible operation mode and the like, and has high practicability. The cementing material is adopted to be beneficial to forming the plate knot body. The red mud treated by the method can be used as a road material, meets a series of performance requirements such as unconfined compressive strength, freeze-thaw resistance, water stability and the like, and also meets the standard requirements such as environmental protection and impermeability as a novel material.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, in the mixture, the mass of the soil solidifying agent is 0.01-0.02% of the mass sum of the cementing material and the red mud, and the mass ratio of the cementing material to the red mud is (4-10): (96:90).
the beneficial effect of adopting the further scheme is that: the soil curing agent, the cementing material and the red mud in proper proportion are beneficial to improving the performance of a pavement base, have more superior performance in the aspects of compressive strength, deflection value and the like compared with the traditional process, and have the advantages of improving the quality, reducing the manufacturing cost, saving energy, protecting environment and the like. The traditional road building material is lime-lime crushed stone, needs a large amount of lime, water-stabilized sand grains and crushed stone chips, on one hand, the mountain-opening and ore-burning cause great pollution to the environment and cause resource waste, and if the treated red mud composite material is used, the problems of red mud accumulation and land occupation and environmental protection can be fundamentally solved, and the composite material can completely replace the traditional lime-lime crushed stone on the road standard.
Further, the soil stabilizer comprises the following components in parts by weight: 24-36 parts of sulfonate, 100 parts of water, 21-35 parts of acid reagent, 1-5 parts of anionic surfactant, 1-5 parts of catalyst, 12-22 parts of aluminum sulfate, 3-5 parts of early strength agent and 0.8-1 part of nonionic surfactant.
the beneficial effect of adopting the further scheme is that: the soil stabilizer is a concentrated compound acid compound, is non-volatile and non-flammable, and has strong oxidation and dissolution capacities. Can react with inorganic substances such as alumina, ferric oxide, silicate and the like in the red mud to form a compact waterproof structure.
in the invention, the sulfonate can improve the water immersion resistance of the soil body in the compacted soil body; the catalyst can accelerate the solidification of the compacted roadbed pavement material, the anionic surfactant can greatly reduce the surface tension of water adsorbed by particles in the red mud under an acidic condition, so that the red mud is separated into finer soil particles, and redundant water molecules are discharged or evaporated, thereby reducing the gaps among the soil particles after the compacted roadbed pavement mixed material, improving the compactness and improving the strength. The acid reagent can be matched with a cementing material for use, so that calcium and magnesium ions can be ionized from particles in the red mud, and the ions react with the cementing material to form a compact reticular plate body with catalysis and water resistance; the nonionic surfactant is matched with ionic solutions of other components in the soil curing agent for use, so that electric double layers in the red mud release more free water, the compaction is easier under the action of external pressure, and meanwhile, hydrophobic groups further block the invasion of external water sources and have a hydrophobic effect; sodium and potassium ions in the red mud colloid are replaced by aluminum sulfate, so that the hygroscopicity is improved, and the method is particularly suitable for coastal areas; the early strength agent can improve the stability of the soil curing agent on one hand, and can improve the early strength when acting with particles and cementing materials in the red mud on the other hand, thereby quickly meeting the strength requirement of early rush repair of roads.
The proportion of each component is set properly, which is beneficial to exciting the activity of the red mud, so that the red mud, the cementing material and the curing agent react fully in a proper medium environment to form a compact structure under the physical action, such as: when the dosage of the acidic reagent component is too large, the medium environment of the action of the red mud and the colloid material is easily influenced, the strength is not favorably formed, and when the dosage of the acidic reagent component is too small, the activity of the red mud is not easily excited, so that the reaction is incomplete.
The soil stabilizer used in the invention is an environment-friendly soil stabilizer, which is convenient for roadbed and pavement construction, each technical index reaches the national standard, the dosage of traditional road building materials such as lime and cement can be reduced, the water immersion resistance and freeze-thaw resistance of roadbed and pavement ground can be improved, the overall strength of the roadbed and pavement can be improved, the construction cost can be greatly reduced, the service life of the highway can be prolonged, and the maintenance cost of the highway can be reduced.
Further, the sulfonate is selected from one or two of sodium lignosulfonate and calcium lignosulfonate.
The beneficial effect who adopts above-mentioned scheme is: the calcium lignosulfonate and/or sodium lignosulfonate can be used for further improving the water immersion resistance of the red mud.
Further, the acid reagent is selected from one or a combination of two of concentrated sulfuric acid and concentrated hydrochloric acid.
The beneficial effect who adopts above-mentioned scheme is: the concentrated sulfuric acid and/or concentrated hydrochloric acid are adopted, so that a good medium environment is provided, the activity of red mud colloid is excited, calcium and magnesium ions are ionized, and the calcium and magnesium ions are fully reacted with other components of a curing agent, a cementing material and the like to form a compact reticular plate body, and the catalytic and waterproof effects are achieved.
Further, the anionic surfactant is petroleum sulfonate.
The beneficial effect who adopts above-mentioned scheme is: the double electric layers of the red mud release more free water, the compaction is easier under the action of external pressure, and meanwhile, the hydrophobic groups further block the invasion of external water sources and have a hydrophobic effect.
Further, the catalyst is ethylenediamine.
The beneficial effect who adopts above-mentioned scheme is: and the anti-freezing effect of the process is improved by reacting with metal ions.
further, the early strength agent is calcium sulfate.
The beneficial effect who adopts above-mentioned scheme is: improve the early strength, and is particularly suitable for being used in the low-temperature condition in the early winter.
Further, the neutral surfactant is polyethylene glycol PEG-200.
The beneficial effect who adopts above-mentioned scheme is: and stabilizing the curing agent product.
The preparation method of the soil stabilizer can comprise the following steps:
(1) Dissolving sulfonate with water to obtain a first solution;
(2) Adding an acid reagent into the first solution obtained in the step (1), heating (at about 80 ℃), adding an anionic surfactant and a catalyst, stirring, and cooling to obtain a second solution;
(3) And (3) adding aluminum sulfate and an early strength agent into the second solution obtained in the step (2), mixing, adding a nonionic surfactant, and mixing to obtain the soil curing agent.
Further, the cementitious material comprises cement and/or lime.
Further, the cement is selected from one or more of ordinary portland cement, fly ash cement, slag portland cement and pozzolan cement.
further, the lime is a product obtained by calcining limestone at high temperature. Either quicklime or slaked lime. Preferably, the lime is a product obtained by calcining limestone at high temperature, and may be lime containing calcium oxide and magnesium oxide, and slaked lime generally requires more than third grade lime.
Further, the red mud is red mud produced from bauxite of boehmite type and/or gibbsite type of aluminum and iron. Preferably, the red mud is produced from bauxite of boehmite type and gibbsite type containing high contents of aluminum and iron, and the contents of alumina, iron oxide and alkali are high.
The beneficial effect of adopting the scheme is that:
A large number of research and analysis show that the hardened slab formed by the method contains more crystals and a small amount of hydrated calcium sulphoaluminate needle crystals exist. The reaction mechanism of the composite material is formed in such a way that the main mineral components of the red mud are mainly boehmite type and gibbsite type bauxite with high aluminum and iron contents, and the generated red mud contains higher aluminum oxide, iron oxide, alkali and the like; the soil stabilizer is a strong catalyst containing a special excitant; the main components of the cement are tricalcium silicate, dicalcium silicate and the like. When the soil curing agent and the cementing material are mixed and compounded with the red mud and a proper amount of water, the following series of reactions occur: the effective components of cement or lime are strongly hydrolyzed and hydrated in the water-containing state, and at the same time, calcium hydroxide is decomposed from the solution and other hydrate is formed, and said hydrate can be further reacted with active silicon dioxide and aluminium oxide in red mud and flyash to form low-alkaline silicic acidSalt, aluminate hydrates; meanwhile, because the soil curing agent contains a large amount of excitant and accelerant, the dispersion and adsorption effects of the soil curing agent increase the hydration point of the cement, improve the interface condition of cement, lime, red mud and fly ash particles, accelerate the hydration reaction and more effectively react with active ingredients such as SiO in the cement, lime, red mud and fly ash particles2、 Al2O3、FeO、Fe2O3CaO and the like are reacted violently and hardened at normal temperature to generate considerable strength, so that the solidified body is compact in structure and improved in strength.
Further, after the mixture is obtained, the steps of compacting and curing can be carried out.
The beneficial effect of adopting the further scheme is that: the mixture is formed by compacting, maintaining and other steps, can be applied to the fields of road pavement base course, subbase course and the like, and improves the additional value of the red mud.
Detailed Description
the principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
A method for treating red mud by using a soil curing agent comprises the following steps: the soil curing agent, the cementing material and the red mud are mixed to obtain a mixture, and then a molding process is carried out. The forming process comprises the steps of compacting, maintaining and the like. The red mud discharged from the aluminum industry can be used as a curing mixture to form the composite consolidated soil by the method. In the above steps, in the mixture, the mass of the soil solidifying agent is 0.01-0.02% of the mass sum of the cementing material and the red mud, and the mass ratio of the cementing material to the red mud is (4-10): (96:90). The soil stabilizer comprises the following components: acid reagent, sulfonate, surfactant, early strength agent, etc. The cementitious material comprises cement and/or lime. Specifically, the cement is ordinary portland cement, fly ash cement, slag portland cement and/or pozzolan cement. The lime is a product obtained by calcining limestone at high temperature. The red mud is produced from bauxite of boehmite type and gibbsite type of aluminum and iron.
The invention provides a novel red mud treatment application technology, the key of the technology is the use problem of a new material soil curing agent, and the technology is how to compound the red mud and a cementing material and form a plate structure through a construction process (mixing, paving, rolling, curing and the like). The material used as a road material meets a series of performance requirements such as unconfined compressive strength, freeze-thaw resistance, water stability and the like, and simultaneously, the material used as a novel material also meets the standard requirements such as environmental protection and impermeability.
In the road test process, the red mud is used as a main raw material, a certain amount of lime (or cement) and a soil curing agent are added, and after mixing, stirring, compacting and maintaining, a series of performance tests such as unconfined compressive strength, freeze-thaw resistance, water stability and the like are performed, and the result shows that the pavement base layer has good performance, has more superior performance in the aspects of compressive strength, deflection value and the like compared with the traditional process, and has the advantages of improving the treatment effect, reducing the manufacturing cost, saving energy, protecting environment and the like. According to the difference of chemical components, mineral components and granularity characteristics of the red mud, the appropriate soil curing agent and a certain amount of cementing material are blended, so that the red mud can be widely applied to the field of civil engineering, and the additional value of the red mud is greatly improved.
The following description is given by way of specific examples.
the petroleum sulfonate used in each example was purchased from oil science and technology ltd of eastern Runck.
example 1:
Taking the Shandong Xinghua red mud as an example, the red mud is used as a base course material and an underlayer material, and the mixing ratio (in percentage by mass) of the raw materials is as follows:
the dosage of the soil curing agent is 0.02 percent of the mass sum of the cement, the hydrated lime and the red mud; the mass ratio of the cement to the hydrated lime to the red mud is 5:5: 90; the amount of added water was 27% of the total mass (i.e., the total dry mass excluding water), and it was determined not to be too wet or too dry depending on the soil quality on site. Mixing, spreading, rolling, curing and the like to form a plate knot body. The time between mixing and rolling is not more than 6 hours.
The formula of the soil stabilizer is as follows: 30kg of calcium lignosulphonate, 100kg of water, 35kg of concentrated hydrochloric acid, 5kg of anionic bright active agent petroleum sulfonate, 5kg of catalyst ethylenediamine, 18kg of aluminum sulfate, 5kg of early strength agent calcium sulfate and 2001 kg of nonionic surfactant polyethylene glycol (PEG-2001).
The soil stabilizer can be prepared by the following method:
1. Dissolving: adding 30kg of calcium lignosulphonate into a reaction kettle, adding 100kg of water, and starting the reaction kettle until the calcium lignosulphonate is fully dissolved;
2. Slowly adding 35kg of concentrated hydrochloric acid while continuously stirring, keeping the temperature in the kettle at 80 ℃, adding 5kg of petroleum sulfonate and 5kg of catalyst ethylenediamine, continuously stirring for 90 minutes, and then boiling cooling water to normal temperature;
3. Adding 18kg of aluminum sulfate and 5kg of early strength agent calcium sulfate in sequence, adding polyethylene glycol (PEG) -2001 kg of nonionic surfactant after uniformly stirring, continuing stirring for 90 minutes, and stopping the kettle.
carrying out heavy compaction test and unconfined compressive strength test on pavement base material by referring to experimental methods of 'test specification for inorganic binder stabilizing material of highway engineering' JTG E51-2009 and 'test specification for geotechnical engineering' JTG E40-2007, wherein the maximum dry density of the mixing ratio is 1.56g/cm3The optimal water content is 27.6%, test pieces with the diameter of 50mm and the height of 50mm are manufactured, the compactness is controlled to be 98%, the unconfined compressive strength of standard health maintenance for 7 days is 1.85MPa, and the road standard of a road is completely met.
In the detection of pollutants in red mud, total chromium and hexavalent chromium are main pollutants. After the soil curing agent is used for curing, the dissolution of total chromium and hexavalent chromium is greatly reduced, and the national regulation standard is met. The precipitation amount of hexavalent chromium from the red mud made into a stable soil consolidation body is 0.157mg/L detected by the environmental monitoring center of the ministry of environmental protection, and the hexavalent chromium precipitation amount completely meets the requirement of the integrated wastewater discharge standard of the Ministry of environmental protection on the highest allowable discharge concentration of hexavalent chromium-containing industrial wastewater of 0.5 mg/L.
Example 2:
Taking Shandong river high red mud as an example, the red mud is used as a base course material and an underlayer material, and the mixing ratio of the raw materials (wherein water is added externally):
The dosage of the soil curing agent is 0.02 percent of the mass sum (namely the total dry mass except water) of the cement, the hydrated lime and the red mud; the mass ratio of the cement to the hydrated lime to the red mud is 4:4: 92; the consumption of the added water is 27 percent of the total mass, is determined according to the soil quality of the site, and can not be over-wet or over-dry. Mixing, spreading, rolling, curing and the like to form a plate knot body. The time between mixing and rolling is not more than 6 hours.
The formula of the soil stabilizer is as follows: 25kg of calcium lignosulphonate, 100kg of water, 18kg of concentrated sulfuric acid, 10kg of concentrated hydrochloric acid, 5kg of anionic surfactant petroleum sulfonate, 5kg of catalyst ethylenediamine, 15kg of aluminum sulfate, 5kg of early strength agent calcium sulfate and 2001 kg of nonionic surfactant polyethylene glycol (PEG).
The soil stabilizer can be prepared by the following method:
1. dissolving: adding 25kg of calcium lignosulphonate into a reaction kettle, adding 100kg of water, and starting the reaction kettle until the calcium lignosulphonate is completely dissolved;
2. Slowly adding 18kg of concentrated sulfuric acid and 10kg of concentrated hydrochloric acid while continuously stirring, keeping the temperature in the kettle at 80 ℃, adding 5kg of anionic surfactant petroleum sulfonate and 5kg of catalyst ethylenediamine, continuously stirring for 90 minutes, and then boiling cooling water to normal temperature;
3. Adding 15kg of aluminum sulfate and 5kg of early strength agent calcium sulfate in sequence, adding the nonionic surfactant polyethylene glycol PEG-2001 kg after uniformly stirring, continuing stirring for 90 minutes, and stopping the kettle.
Carrying out heavy compaction test and unconfined compressive strength test on pavement base material by referring to experimental methods of 'test specification for inorganic binder stabilizing material of highway engineering' JTG E51-2009 and 'test specification for geotechnical engineering' JTG E40-2007, wherein the maximum dry density of the mixing ratio is 1.52g/cm3The optimum water content is 30.0 percent, test pieces with the diameter of 50mm and the height of 50mm are manufactured, the compactness is controlled to be 98 percent, the unconfined compressive strength of standard health maintenance for 7 days is 1.68MPa, and the road standard of a road is completely met.
Meanwhile, in the detection of pollutants in the red mud, total chromium and hexavalent chromium are main pollutants. After the solidification by using the curing agent, the dissolution of total chromium and hexavalent chromium is greatly reduced, the total chromium content in the red mud before treatment is 1.51 mg/L, the hexavalent chromium content is 1.135mg/L, the total chromium content in the treated consolidated soil test is 0.61 mg/L, and the hexavalent chromium content is 0.157 mg/L. Meets the national regulation standard.
Example 3
Taking the Shandong Xinghua red mud as an example, the red mud is used as a base course material and an underlayer material, and the mixing ratio (in percentage by mass) of the raw materials is as follows:
The dosage of the soil curing agent is 0.015 percent of the mass sum (namely the total dry mass except water) of the cement, the hydrated lime and the red mud; the mass ratio of the cement to the hydrated lime to the red mud is 3:4: 93. The consumption of the added water is 27 percent of the total mass, is determined according to the soil quality of the site, and can not be over-wet or over-dry. The rest is the same as in example 1.
the experimental results are as follows: carrying out heavy compaction test and unconfined compressive strength test on pavement base material by referring to experimental methods of 'test specification for inorganic binder stabilizing material of highway engineering' JTG E51-2009 and 'test specification for geotechnical engineering' JTG E40-2007, wherein the maximum dry density of the mixing ratio is 1.52g/cm3The optimum water content is 30.0 percent, test pieces with the diameter of 50mm and the height of 50mm are manufactured, the compactness is controlled to be 98 percent, the unconfined compressive strength of standard health maintenance for 7 days is 1.48MPa, and the road standard of a road is completely met.
Meanwhile, in the detection of pollutants in the red mud, total chromium and hexavalent chromium are main pollutants. After the solidification by using the curing agent, the dissolution of total chromium and hexavalent chromium is greatly reduced, the total chromium content in the red mud before treatment is 1.51 mg/L, the hexavalent chromium content is 1.135mg/L, the total chromium content in the treated consolidated soil test is 0.61 mg/L, and the hexavalent chromium content is 0.157 mg/L. Meets the national regulation standard.
Example 4
Taking the Shandong Xinghua red mud as an example, the red mud is used as a base course material and an underlayer material, and the mixing ratio (in percentage by mass) of the raw materials is as follows:
The dosage of the soil curing agent is 0.01 percent of the mass sum of the cement, the hydrated lime and the red mud; the mass ratio of the cement to the hydrated lime to the red mud is 2:2: 96. The consumption of the added water is 27 percent of the total mass, is determined according to the soil quality of the site, and can not be over-wet or over-dry. The rest is the same as in example 1.
The experimental results are as follows: reference to the inorganic binder stability Material test for Highway engineeringCarrying out heavy compaction test and unconfined compressive strength test on pavement base material by using experimental methods of regulations JTG E51-2009 and Highway soil engineering test regulations JTG E40-2007, wherein the maximum dry density of the mixing ratio is 1.52g/cm3the optimum water content is 30.0 percent, test pieces with the diameter of 50mm and the height of 50mm are manufactured, the compactness is controlled to be 98 percent, the unconfined compressive strength of standard health maintenance for 7 days is 1.4MPa, and the road standard of a road is completely met.
meanwhile, in the detection of pollutants in the red mud, total chromium and hexavalent chromium are main pollutants. After the solidification by using the curing agent, the dissolution of total chromium and hexavalent chromium is greatly reduced, the total chromium content in the red mud before treatment is 1.51 mg/L, the hexavalent chromium content is 1.135mg/L, the total chromium content in the treated consolidated soil test is 0.61 mg/L, and the hexavalent chromium content is 0.157 mg/L. Meets the national regulation standard.
In order to demonstrate the superiority of the treatment with the soil stabilizer used in the present invention, the inventors also conducted the following experiments. The formula of each group of soil stabilizer is as follows.
Formula 1: the soil stabilizer used in example 1 was used.
And (2) formula: the soil stabilizer used in example 2 was used.
Formula 10: concentrated hydrochloric acid was not used on the basis of the formulation 1, and the rest was the same as the formulation 1.
Formula 11: the dosage of concentrated hydrochloric acid is reduced to 5kg on the basis of the formula 1, and the rest is the same as the formula 1.
formula 12: the early strength agent is not used on the basis of the formula 1, and the rest is the same as the formula 1.
The ingredients of formulations 3 to 9 are shown in table 1, the preparation method being referred to that of formulation 1.
TABLE 1
The soil curing agent with each formula is subjected to index detection such as compressive strength, water stability, freezing and thawing resistance and the like by adopting a method of road engineering inorganic binder stable material test regulation JTG E51-2009. In the experiment, the mass ratio of the Shandong Xinghua red mud to the ordinary Portland cement 42.5 to the three-level calcium slake is 92:4:4, the dosage of the soil solidifying agent is 0.02% of the mass sum of the Shandong Xinghua red mud and the ordinary Portland cement 42.5 to the three-level calcium slake, the compressive strength is 7 days without lateral compressive strength, the water resistance is 7 days under the condition of water saturation and water absorption, the freeze-thaw resistance is the ratio of circulating freeze-thaw 5 times, and the detection results are shown in Table 2.
The results of the performance measurements are shown in table 2.
The experimental data show that the soil stabilizer prepared by the formula has the advantages of high strength, good water stability, good freezing stability and the like.
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 (10)
1. A method for treating red mud by using a soil curing agent is characterized by comprising the following steps: and mixing the soil curing agent, the cementing material and the red mud to obtain a mixture.
2. The method for treating red mud by using the soil solidifying agent according to claim 1, wherein in the mixture, the mass of the soil solidifying agent is 0.01-0.02% of the mass sum of the cementing material and the red mud, and the mass ratio of the cementing material to the red mud is (4-10): (96:90).
3. The method for treating red mud by using the soil solidifying agent according to claim 1 or 2, wherein the soil solidifying agent comprises the following components in parts by weight: 24-36 parts of sulfonate, 100 parts of water, 21-35 parts of acid reagent, 1-5 parts of anionic surfactant, 1-5 parts of catalyst, 12-22 parts of aluminum sulfate, 3-5 parts of early strength agent and 0.8-1 part of nonionic surfactant.
4. The method for treating red mud by using the soil solidifying agent according to claim 3, wherein the sulfonate is selected from one or a combination of two of sodium lignosulfonate and calcium lignosulfonate.
5. the method for treating red mud by using the soil solidifying agent according to claim 3, wherein the acid reagent is selected from one or a combination of two of concentrated sulfuric acid and concentrated hydrochloric acid.
6. The method for treating red mud with a soil solidifying agent according to claim 1 or 2, wherein the cementing material comprises cement and/or lime.
7. The method for treating red mud by using the soil solidifying agent according to claim 6, wherein the cement is one or more selected from ordinary portland cement, fly ash cement, slag portland cement and pozzolan cement.
8. The method for treating red mud by using the soil solidifying agent according to claim 6, wherein the lime is a product obtained by calcining limestone at a high temperature.
9. The method according to claim 1 or 2, wherein the red mud is red mud produced from bauxite of boehmite type and/or gibbsite type of aluminum, iron.
10. The method for treating red mud by using the soil solidifying agent according to claim 1 or 2, further comprising the steps of compacting and curing after the mixture is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910751355.7A CN110563421A (en) | 2019-08-15 | 2019-08-15 | Method for treating red mud by using soil curing agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910751355.7A CN110563421A (en) | 2019-08-15 | 2019-08-15 | Method for treating red mud by using soil curing agent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110563421A true CN110563421A (en) | 2019-12-13 |
Family
ID=68775344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910751355.7A Pending CN110563421A (en) | 2019-08-15 | 2019-08-15 | Method for treating red mud by using soil curing agent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110563421A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113136213A (en) * | 2021-04-22 | 2021-07-20 | 河南省交通规划设计研究院股份有限公司 | Soil stabilizer prepared from bauxite tailings |
| CN114276092A (en) * | 2022-01-21 | 2022-04-05 | 光大国信环保科技(北京)有限公司 | Non-autoclaved building material product composition and preparation method and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1804228A (en) * | 2006-01-25 | 2006-07-19 | 王涌 | Soil solidifying agent |
| KR20160049066A (en) * | 2014-10-21 | 2016-05-09 | 주식회사 네스콘 | Soil composition with improved insulating property |
| CN105950157A (en) * | 2016-07-27 | 2016-09-21 | 松田勤 | Environment-friendly inorganic soil solidification additive |
-
2019
- 2019-08-15 CN CN201910751355.7A patent/CN110563421A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1804228A (en) * | 2006-01-25 | 2006-07-19 | 王涌 | Soil solidifying agent |
| KR20160049066A (en) * | 2014-10-21 | 2016-05-09 | 주식회사 네스콘 | Soil composition with improved insulating property |
| CN105950157A (en) * | 2016-07-27 | 2016-09-21 | 松田勤 | Environment-friendly inorganic soil solidification additive |
Non-Patent Citations (4)
| Title |
|---|
| L.REIG: "《Properties and microstructure of alkali-activated red clay brick waste》", 《CONSTRUCTION AND BUILDING MATERIALS》 * |
| 朱晓波: "《赤泥二次资源综合利用研究》", 28 February 2017, 天津科学技术出版社 * |
| 李林波: "《有色冶金环保与资源综合利用》", 30 November 2017, 冶金工业出版社 * |
| 陈瑞锋: "《赤泥改性黄土的基本工程性质研究》", 《岩土力学》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113136213A (en) * | 2021-04-22 | 2021-07-20 | 河南省交通规划设计研究院股份有限公司 | Soil stabilizer prepared from bauxite tailings |
| CN114276092A (en) * | 2022-01-21 | 2022-04-05 | 光大国信环保科技(北京)有限公司 | Non-autoclaved building material product composition and preparation method and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhu et al. | Effect of wet-grinding steel slag on the properties of Portland cement: An activated method and rheology analysis | |
| Siddique | Waste materials and by-products in concrete | |
| Xu et al. | Ammonia-soda residue and metallurgical slags from iron and steel industries as cementitious materials for clinker-free concretes | |
| Luo et al. | Solidification/stabilization of chromium slag in red mud-based geopolymer | |
| CN111393047B (en) | High-iron belite cement and preparation method thereof | |
| CN113135727B (en) | Red mud-based material for roadbed water stabilization layer and preparation method thereof | |
| CN102070317B (en) | Mineral admixture concrete | |
| CN111704406A (en) | Application of household garbage incineration fly ash composite admixture in cement stabilized macadam mixture | |
| CN110218037B (en) | Wet ash-discharging base filling material and preparation method and application thereof | |
| CN108675751A (en) | A kind of environment-friendly type mud composite curing agent | |
| CN102002366A (en) | Salinized soil curing agent prepared from industrial waste slag | |
| CN101885589A (en) | Compound sulfate cement | |
| Patangia et al. | Study on the utilization of red mud (bauxite waste) as a supplementary cementitious material: Pathway to attaining sustainable development goals | |
| CN112358270A (en) | Solid waste base coastal karst green filling material, and preparation method and application thereof | |
| CN110563421A (en) | Method for treating red mud by using soil curing agent | |
| Li et al. | Characteristics of ammonia-soda residue and its reuse in magnesium oxychloride cement pastes | |
| WO2024109477A1 (en) | Metal smelting waste residue-derived material, preparation method therefor and application thereof | |
| Zhang et al. | Effects of pretreated recycled powder substitution on mechanical properties and microstructures of alkali-activated cement | |
| CN104496218B (en) | A kind of method utilizing chromium slag and chromium mud to prepare active slag powder | |
| CN100531945C (en) | Bauxite tail piling method | |
| CN115340307A (en) | Solid waste based low-carbon high-iron phase-belite system concrete and synergistic solid waste carbon fixation method thereof | |
| CN111170663A (en) | Sea mud curing agent | |
| CN101723608A (en) | Method for preparing travertine gelled material | |
| CN110240438B (en) | Cement-based material compaction reinforcing agent and preparation method thereof | |
| Tushar et al. | Geo-engineering and microstructural properties of geopolymer concrete and motar: a review |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191213 |
|
| RJ01 | Rejection of invention patent application after publication |