Solid waste resource joint disposal method

Abstract

The application discloses a kind of solid waste resource joint disposal method, belong to solid waste data utilization technical field, to solve at least one of the problems that red mud pollutes environment in prior art and red mud is difficult to be directly used as grouting material efficient resource utilization due to high alkalinity, particle size distribution is not reasonable, and cementing activity is insufficient.The method of the present application uses raw materials including group A raw materials and group B raw materials;The method comprises the following steps: step 1: mix water glass and strong base uniformly, adjust the modulus of water glass to the target value, and obtain an alkali activator;Step 2: mix red mud and slag to obtain group A raw materials;Step 3: add water reducing agent to group A raw materials and mix group B raw materials uniformly to obtain grouting material.The present application can be used for solid waste resource joint disposal.

Description

Technical Field

[0001] This invention belongs to the field of solid waste resource utilization technology, and in particular relates to a method for the joint disposal of solid waste resources. Background Technology

[0002] The production of alumina generates a large amount of red mud waste; for every ton of alumina produced, 0.6 to 2 tons of red mud are produced. Traditional red mud treatment methods mainly involve stockpiling and landfilling, which not only occupies a large amount of land resources, but also allows harmful substances such as alkalis and heavy metals in the red mud to seep into the soil and groundwater, causing serious environmental pollution. Existing technologies for the resource utilization of red mud, such as extracting valuable metals, have shortcomings such as high raw material requirements, high energy consumption, and complex process flows.

[0003] On the other hand, traditional grouting materials mainly use cement and sand as raw materials, which consume a large amount of natural resources. If red mud could be used to replace cement in the preparation of grouting materials, it would not only solve the problem of red mud storage, but also reduce the cost of grouting materials. However, the high alkalinity and unreasonable particle size distribution of red mud affect the setting time and strength development of grouting materials, limiting their direct application. Summary of the Invention

[0004] In view of the above analysis, the present invention aims to provide a method for the joint disposal of solid waste resources, in order to solve at least one of the problems in the prior art: the environmental pollution caused by red mud stockpiling and the difficulty in the efficient resource utilization of red mud as a grouting material due to its high alkalinity, unreasonable particle size distribution, and insufficient cementitious activity.

[0005] The objective of this invention is mainly achieved through the following technical solutions: This invention provides a method for the joint disposal of solid waste resources, using raw materials including group A and group B. The method includes the following steps: Step 1: Mix water glass and strong alkali evenly, adjust the modulus of water glass to the target value, and obtain the alkali activator; Step 2: Mix red mud and slag to obtain raw material group A; Step 3: Add the water-reducing agent to the raw materials of group A and group B and mix them evenly to obtain the grouting material.

[0006] Furthermore, the composition of Group A raw materials, calculated by mass percentage, consists of 30-48% red mud and 52-70% slag; the composition of Group B raw materials, calculated by mass percentage of Group A raw materials, includes 1-5% strong alkali, 50-70% water, 1-5% water-reducing agent, and 10-15% water glass.

[0007] Furthermore, step 2 includes the following steps: Step 21: Grind the red mud and slag separately; Step 22: Mix the ground red mud with the ground slag.

[0008] Furthermore, in step 21, the red mud is ground to a specific surface area of ​​1800~2000 m². 2 / kg, slag ground to a specific surface area of ​​1000~1200m² 2 / kg.

[0009] Furthermore, the red mud is either Bayer process red mud or sintering process red mud, or both.

[0010] Furthermore, the water glass is one or both of sodium water glass or potassium water glass.

[0011] Furthermore, the sodium metasilicate contained in the sodium silicate has a mass concentration of 14wt%~35wt% and a modulus of 1.5~3.5.

[0012] Furthermore, the potassium silicate in the potassium silicate has a mass concentration of 14wt% to 45wt% and a modulus of 1.5 to 3.0.

[0013] Furthermore, the strong base is either sodium hydroxide or potassium hydroxide.

[0014] Furthermore, the water-reducing agent is one or both of polycarboxylate-based and naphthalene-based water-reducing agents.

[0015] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: A) The solid waste resource co-processing method provided by this invention, through the addition of red mud, can extend the setting time of red mud slag-based grouting materials, thus alleviating pipeline blockage caused by excessively short setting time in actual industrial systems. Furthermore, the red mud includes coarse and fine red mud, with coarse red mud acting as aggregate filler, and ultrafine red mud exhibiting a more significant micro-aggregate filling effect. The incorporation of fine-particle materials makes the grouting material system more stable, reducing pipeline blockage problems caused by stratification in actual engineering projects. In soil and rock reinforcement grouting projects, the dense microstructure can effectively prevent groundwater infiltration and enhance the stability of the soil and rock mass.

[0016] B) The solid waste resource co-processing method provided by this invention utilizes red mud and slag, both exhibiting high cementitious activity under the action of an alkaline activator. When raw materials from group A and group B are mixed, a hydration reaction occurs, generating a large amount of hydrated calcium silicate, which is the primary source of the compressive strength of the grouting material. As the reaction time increases, the hydration reaction intensifies, and a pozzolanic reaction also occurs to some extent, filling the pores within the grouting material's internal structure, enhancing the adhesion between particles, and thus improving the strength of the grouting material. The cementitious substance also refines the pore structure of the grouting material, reducing its permeability and making it difficult for external moisture and corrosive substances to penetrate, thereby effectively improving the impermeability of the grouting material. It should be noted that since the formation of the cementitious material is an exothermic reaction, it effectively reduces the temperature stress generated within the grouting material due to excessive heat of hydration, reducing the occurrence of cracks and ensuring the quality of the grouting material.

[0017] C) The solid waste resource co-processing method provided by this invention can solve the problems of large land occupation and environmental pollution caused by the large output of red mud. In particular, red mud has a high alkalinity, which can significantly reduce the amount of alkali activator used in engineering projects and ensure sufficient hydration reaction of the grouting material system, thereby improving its compressive strength. Using red mud to prepare grouting materials can effectively improve the utilization rate of red mud, reduce the environmental pollution caused by red mud stockpiling, and realize the resource utilization of solid waste. At the same time, red mud is inexpensive, which can effectively reduce the preparation cost of grouting materials. In large-scale infrastructure construction grouting projects, the use of red mud-based grouting materials can save a lot of money and improve the economic benefits of the project.

[0018] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0019] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0020] Figure 1 The flowchart illustrates the method for joint disposal of solid waste resources provided by this invention. Detailed Implementation

[0021] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0022] This invention provides a method for the joint disposal of solid waste resources. The raw materials used include Group A and Group B. The composition of Group A raw materials is composed of 30-48% red mud and 52-70% slag by mass percentage. The composition of Group B raw materials is composed of 1-5% strong alkali, 50-70% water, 1-5% water-reducing agent and 10-15% water glass by mass percentage of Group A raw materials.

[0023] Specifically, see Figure 1 The method includes the following steps: Step 1: Mix water glass and strong alkali evenly, adjust the modulus of water glass to the target value, and obtain the alkali activator; Step 2: Mix red mud and slag to obtain raw material group A; Step 3: Add the water-reducing agent to the raw materials of group A and group B and mix them evenly to obtain the grouting material.

[0024] Compared with existing technologies, the solid waste resource co-processing method provided by this invention, on the one hand, can extend the setting time of red mud slag-based grouting materials by adding red mud, thus alleviating pipeline blockage caused by excessively short setting time in actual industrial systems. Furthermore, the red mud includes coarse and fine red mud, with coarse red mud acting as aggregate filler, and ultrafine red mud having a more significant micro-aggregate filling effect. The incorporation of fine-particle materials makes the grouting material system more stable, reducing pipeline blockage problems caused by stratification in actual engineering projects. In soil and rock reinforcement grouting projects, the dense microstructure can effectively prevent groundwater infiltration and enhance the stability of the soil and rock mass.

[0025] On the other hand, both red mud and slag exhibit high cementitious activity under the action of alkali activators. When raw materials from group A and group B are mixed, a hydration reaction occurs, generating a large amount of hydrated calcium silicate, which is the main source of the compressive strength of the grouting material. As the reaction time increases, the hydration reaction intensifies, and a pozzolanic reaction also occurs to some extent, filling the pores in the internal structure of the grouting material, enhancing the adhesion between particles, and thus improving the strength of the grouting material. Cementitious substances (such as hydrated calcium silicate gel and pozzolanic reaction products generated during the reaction) can also refine the pore structure of the grouting material, reducing its permeability and making it difficult for external moisture and corrosive substances to penetrate, thereby effectively improving the impermeability of the grouting material. It should be noted that since the formation of the cementitious material is an exothermic reaction, it effectively reduces the temperature stress generated inside the grouting material due to excessive heat of hydration, reducing the occurrence of cracks and ensuring the quality of the grouting material.

[0026] On the other hand, it can solve the problems of large land occupation and environmental pollution caused by the large production of red mud. In particular, the high alkalinity of red mud can significantly reduce the amount of alkali activators used in engineering projects, and ensure sufficient hydration reaction of the grouting material system, thereby improving its compressive strength. Using red mud to prepare grouting materials can effectively improve the utilization rate of red mud, reduce the environmental pollution caused by red mud stockpiling, and realize the resource utilization of solid waste. At the same time, red mud is inexpensive, which can effectively reduce the preparation cost of grouting materials. In large-scale infrastructure grouting projects, the use of red mud-based grouting materials can save a lot of money and improve the economic benefits of the project.

[0027] It should be noted that in the above-mentioned Group A raw materials, the amount of slag added is greater than that of red mud. This changes the main contributor to the strength of the grouting material from low-activity red mud to high-activity slag, which can effectively solve the inherent defects of insufficient strength of red mud-based grouting materials and the need to add cement clinker and early strength agent. Combined with the activation system of Group A and Group B raw materials, it can achieve the effects of high strength, zero cement, zero early strength agent and adjustable setting time.

[0028] Specifically, the roles of each component in the raw materials of group A and group B are as follows: Red mud contains components such as iron oxide, aluminum oxide, and silicon oxide, and possesses inherent gelling activity, enabling it to participate in hydration reactions under alkaline activation conditions. With a pH value as high as 12.1–13.0, red mud's high alkalinity can serve as an "endogenous alkali source," significantly reducing the amount of externally added alkali. Furthermore, red mud exhibits a wide particle size distribution; coarse particles act as aggregate fillers, while ultrafine particles provide micro-aggregate filling, optimizing the particle size distribution of the system, increasing density, and reducing chromatographic sedimentation. Studies have shown that with increasing red mud content, the slurry's resistance to segregation significantly increases.

[0029] Slag is rich in active SiO2, Al2O3 and CaO. Under alkaline activation conditions, slag can rapidly release Ca. 2+ and SiO4 4- It reacts with the active components in red mud to form hydrated calcium silicate (CSH) gel, which is the core source of the compressive strength of the grouting material. The glassy structure of slag gives it high alkali reactivity, and incorporating slag can significantly improve the mechanical strength of the solidified body.

[0030] The main function of strong alkali is to activate the potential gelling activity of red mud and slag. In an alkaline environment, the Si-O and Al-O bonds in the slag glass break, releasing active silicate and aluminate ions, which participate in the condensation reaction to form a gel structure. Simultaneously, strong alkali is used to adjust the water glass modulus to the target value, ensuring the effectiveness of the alkali activator.

[0031] Water glass is another key alkali-activated component, forming a composite alkali-activated system when combined with strong alkalis. The active silicate ions in water glass directly participate in the polycondensation reaction, promoting the formation and growth of the gel network. Studies have shown that the synergistic effect of water glass and NaOH can significantly reduce slurry viscosity, improve fluidity, and enhance compressive strength.

[0032] Water, as the reaction medium and flow carrier, is a prerequisite for the hydration reaction. The amount of water added directly determines the fluidity, setting time, and strength development of the slurry—increasing the water content prolongs the setting time and improves the fluidity, while decreasing the water content shortens the setting time and increases the early strength.

[0033] Water-reducing agents reduce the frictional resistance between particles through dispersion, thereby reducing water consumption while maintaining fluidity, or increasing fluidity without increasing water consumption, while also making a positive contribution to strength.

[0034] Furthermore, the interactions between the various components are as follows: Synergistic effect of red mud and slag: Red mud has limited cementing activity and its strength is insufficient when added alone; slag has high activity but reacts too quickly. When the two are combined, the slag provides a high-strength cementing phase, while the red mud contributes endogenous alkalinity, fills pores and prolongs the setting time.

[0035] Synergistic effect of high alkalinity of red mud and alkaline activator: The high alkalinity of red mud itself (pH 12.1~13.0) constitutes an endogenous alkali, which can provide an initial alkaline environment for the system; the added strong alkali and water glass constitute an exogenous alkali, which further raises the pH to the level required for the activation reaction.

[0036] Synergistic effect of water glass and strong alkali: Water glass and strong alkali are premixed, which can precisely adjust the modulus of water glass to the target value (1.5~3.5) to form a uniform liquid alkali activator. Compared with the existing technology where the solid alkali activator slowly dissolves in the slurry, resulting in uneven local concentration, the liquid alkali activator in this invention can be instantly and uniformly dispersed after being added to the raw materials of group A. The hydration reaction proceeds synchronously, fully, and stably, resulting in a continuous and dense hydrated calcium silicate gel with significantly improved strength.

[0037] Synergistic effect of multi-level particle size distribution and chemical cementation in red mud: Red mud has a wide particle size range, with coarse particles filling the skeletal pores and ultrafine particles filling the micropores. Together with chemical hydration products (CSH, CA-(N)-SH gel), they form a dense microstructure. Physical filling reduces porosity and permeability, while chemical cementation provides the source of strength. The synergy between the two gives the grouting material both high strength and excellent impermeability.

[0038] Furthermore, to address the issue of complex processing procedures caused by the need for red mud pretreatment, the aforementioned red mud is either Bayer process red mud or sintering process red mud, or both. This is because the Bayer process and sintering process are the mainstream processes in alumina production, producing two types of red mud with large yields and prominent alkaline characteristics. Directly applying them to the treatment system of this invention can fully utilize their inherent alkalinity, reducing the amount of added alkali activator required. No prior dealkali pretreatment is needed, eliminating the red mud pretreatment process, further simplifying the treatment process and reducing processing costs.

[0039] Furthermore, to address the issue of unstable performance of water glass, it is selected from one or both of sodium silicate and potassium silicate. This is because both sodium silicate and potassium silicate are commonly used alkali-activated materials in engineering, exhibiting stable performance and allowing for flexible selection based on actual engineering needs, thus adapting to the material supply requirements of grouting projects of different scales.

[0040] Furthermore, to address the low efficiency of pH and water glass modulus adjustment, the strong alkali is either sodium hydroxide or potassium hydroxide. This is because both sodium hydroxide and potassium hydroxide are readily soluble in water, can rapidly adjust the pH and water glass modulus of the system, disperse quickly in the slurry, and rapidly establish a stable alkaline activation environment.

[0041] Furthermore, to address the issue of poor particle characteristics matching between the water-reducing agent and the solid waste-based grouting system, the water-reducing agent is one or both of polycarboxylate-based and naphthalene-based water-reducing agents. This is because polycarboxylate-based water-reducing agents have excellent dispersion effects, low dosage, and high water reduction rate, enabling them to better adapt to the particle characteristics of the solid waste-based grouting system. Good fluidity can be achieved at lower dosages, further reducing preparation costs.

[0042] Furthermore, to address the issues of rapid setting due to excessively low modulus or slow early strength development due to excessively high modulus, the sodium metasilicate in the sodium silicate is at a concentration of 15wt%~35wt%, and the modulus of sodium metasilicate is 1.5~3.5. This modulus of 1.5~3.5 ensures sufficient alkalinity to fully activate the gelling activity of the slag (52%~70%), generating sufficient CSH gel to ensure high strength, while mitigating the effects of rapid setting due to excessively low modulus or slow early strength development due to excessively high modulus. Simultaneously, the characteristic that the setting time significantly increases with increasing modulus within this range, combined with the independent control of the water content (50%~70%) in the B mixture, provides users with the engineering convenience of actively adjustable setting time. The mass concentration of 14wt%~35wt% ensures that the water glass provides sufficient active silicon source for the reaction under stable storage conditions, enabling the unification of high strength and adjustable setting time without the need for adding cement clinker and early strength agents.

[0043] Correspondingly, the potassium silicate concentration in potassium silicate is 14wt%~45wt%, and the modulus of potassium silicate is 1.5~3.0. This parameter range allows potassium silicate to provide sufficient active silicon source to participate in the polymerization reaction and generate gelling substances in an alkaline-activated system, while also ensuring the storage stability and workability of the solution. Compared with sodium silicate, potassium silicate contains more potassium silicate (K₂O₅). + The potassium ions introduced by potassium silicate have a large ionic radius and low hydration energy, which can reduce the tendency of free alkali to precipitate in the grout. This results in a lower risk of surface efflorescence during the hardening process of the grouting material, which is particularly important for underground engineering and soil and rock reinforcement grouting. Efflorescence not only affects the bonding performance between the grout and the soil-rock interface, but also leads to increased material porosity and decreased long-term durability due to alkali precipitation. Simultaneously, potassium silicate exhibits better chemical compatibility with the abundant potassium-containing minerals in red mud, which helps promote the geological polymerization reaction of aluminosilicates in the system, forming a more dense three-dimensional network structure of the gel phase, further enhancing the impermeability and corrosion resistance of the grouting material.

[0044] Furthermore, step 2 above includes the following steps: Step 21: Grind the red mud and slag separately. Grind the red mud to a specific surface area of ​​1800~2000 m². 2 / kg, to maintain its coarse particle skeleton function, slag is ground to a specific surface area of ​​1000~1200m². 2 / kg, high fineness to fully expose its vitreous active surface; Step 22: Premix the ground red mud with 30-40% of the total slag, add 0.5-1% of the total raw materials in Group A as a weak alkaline activating agent (e.g., sodium metasilicate or desulfurized gypsum), and co-mill in a high-energy ball mill at a speed of 300-500 r / min for 10-20 min, so that the ultrafine slag particles are uniformly embedded in the pores and defect sites on the surface of the red mud particles, forming composite particles of red mud skeleton-slag active coating; Step 23: The remaining pulverized slag is mixed with the composite particles obtained in Step 22 in a fluidized bed air classifier. By controlling the airflow speed, the pulverized slag is uniformly attached to the surface of the composite particles to obtain a mixed raw material of Group A with a macroscopically uniform structure and a microscopically gradient distribution of red mud core, intermediate activation layer, and outer slag enrichment zone.

[0045] In this way, differentiated grinding allows red mud to maintain its coarse-particle skeleton function while slag acquires an ultra-fine, highly active surface, achieving functional zoning and complementary advantages of the two solid wastes at the microscale. This solves the inherent defect in conventional dry mixing methods where slag particles are encapsulated by red mud and cannot fully exert their cementitious activity. Red mud and partially ground slag are co-milled under high-energy ball milling to form a chemically bonded zeolite precursor activation layer, which transforms the interface between red mud and slag from physical contact to chemical bonding, significantly improving the interfacial bonding strength. The three-layer ordered microstructure of red mud core, activation transition layer, and slag enrichment zone constructed by airflow graded gradient mixing achieves a progressive enhancement effect, with the outer slag preferentially hydrated to provide early strength and the inner red mud subsequently reinforced by volcanic ash reaction. At the same time, the microstructure is continuous and dense, without interfacial cracks.

[0046] Furthermore, step 3 above includes the following steps: After adding the water-reducing agent and water to the raw materials in group A and mixing them evenly, add the strong alkali and mix evenly. Finally, add the alkali activator and mix evenly.

[0047] In this way, by improving the order of addition, the water-reducing agent first fully interacts with the raw materials in group A, resulting in a high degree of dispersion of red mud and slag particles. After the strong alkali is added as an intermediate layer, a high-pH micro-region is formed around the particles. At this point, there is no active silicon source (water glass has not yet been added), and the alkali only acts as an activator—causing partial breakage of Si-O and Al-O bonds on the surface of the slag glass, releasing active ions and forming a calcium- and aluminum-rich activation layer on the particle surface. Finally, the added alkali activator reacts rapidly with the activation layer to generate CSH gel.

[0048] By employing a three-step feeding sequence—preferential dispersion of the water-reducing agent, separate activation by the strong alkali, and final cross-linking by the alkali activator—the dispersing function of the water-reducing agent, the activation function of the strong alkali, and the cross-linking function of the water glass are fully utilized within their respective independent time windows without interference. This simultaneously achieves high particle dispersion and chemical bonding at the interface. Furthermore, the calcium- and aluminum-rich activation layer formed on the surface of the slag particles by the strong alkali pretreatment chemically bonds with the subsequently added water glass to form a CSH gel, constructing a fully chemically bonded gradient microstructure of particles-chemical bonds-activation layer-chemical bonds-gel. The interfacial bonding strength is far superior to that of traditional physical coating structures.

[0049] The present invention will be further described in detail below through embodiments. Unless otherwise specified, the raw materials used in the embodiments of the present invention are all commercially available or obtainable by those skilled in the art.

[0050] Performance tests were conducted according to the following standards: setting time (GB / T1346-2011); fluidity (GB / T50448-2015); bleeding rate (JC / 2153-2012); compressive strength and flexural strength (GB / T17671-1999). The specimen sizes were 40mm×40mm×40mm and 40mm×40mm×160mm.

[0051] Example 1 This embodiment provides a method for the joint disposal of solid waste resources. The raw materials in Group A include 30g of red mud and 70g of slag. The raw materials in Group B include 2% strong alkali, 60% water, 1% water-reducing agent and 10% water glass. Bayer process red mud is selected as red mud, sodium hydroxide as strong alkali, naphthalene-based water-reducing agent as water-reducing agent, sodium water glass as water glass, the modulus of water glass is 2.5, and the mass concentration of sodium metasilicate is 14.44%.

[0052] The method in this embodiment includes the following steps: Weigh out sodium silicate and sodium hydroxide, mix and stir until homogeneous, let stand for later use, stirring every 30 seconds to prevent sodium hydroxide from precipitating; weigh out slag and red mud, and grind the red mud and slag separately, grinding the red mud to a specific surface area of ​​1999 m². 2 / kg, slag ground to a specific surface area of ​​1130m² 2 / kg, the ground red mud and 30% of the total slag were premixed, and 0.5% of the total raw materials of group A were added. The mixture was then ground in a high-energy ball mill at 400 r / min for 15 min. The remaining ground slag was then mixed with the composite particles in a fluidized bed air classifier to obtain the mixed raw materials of group A. Naphthalene-based water-reducing agent, water, sodium hydroxide and alkali activator were added in sequence. Each time a new component was added, it was mixed and stirred evenly to obtain the grouting material. Then, the mixture was stirred with a hand-held mixer every 5 min.

[0053] The data from the fluidity test, setting time determination, bleeding rate test, and 3d, 7d, and 28d strength tests are as follows: Flowability 265mm, initial setting time 6h, final setting time 15.5h, bleeding rate 1.2%, 3d compressive strength 14.2MPa, 7d compressive strength 17.2MPa, 28d compressive strength 19.6MPa.

[0054] Example 2 This embodiment provides a method for the joint disposal of solid waste resources. The raw materials in Group A include red mud 48 and slag 52, and the raw materials in Group B include strong alkali 2%, water 60%, water-reducing agent 1% and water glass 10%. Bayer process red mud is selected as red mud, sodium hydroxide as strong alkali, naphthalene-based water-reducing agent as water-reducing agent, and sodium water glass as water glass. The modulus of water glass is 2.5 and the mass concentration of sodium metasilicate is 14.44%.

[0055] The method in this embodiment includes the following steps: Weigh out sodium silicate and sodium hydroxide, mix and stir until homogeneous, let stand for later use, stirring every 30 seconds to prevent sodium hydroxide from precipitating; weigh out slag and red mud, and grind the red mud and slag separately, grinding the red mud to a specific surface area of ​​1999 m². 2 / kg, slag ground to a specific surface area of ​​1130m² 2 / kg, the ground red mud and 30% of the total slag were premixed, and 0.5% of the total raw materials of group A were added. The mixture was then ground in a high-energy ball mill at 400 r / min for 15 min. The remaining ground slag was then mixed with the composite particles in a fluidized bed air classifier to obtain the mixed raw materials of group A. Naphthalene-based water-reducing agent, water, sodium hydroxide and alkali activator were added in sequence. Each time a new component was added, it was mixed and stirred evenly to obtain the grouting material. Then, the mixture was stirred with a hand-held mixer every 5 min.

[0056] The data from the fluidity test, setting time determination, bleeding rate test, and 3d, 7d, and 28d strength tests are as follows: Flowability 240mm, initial setting time 6.5h, final setting time 16.5h, bleeding rate 1.9%, 3d compressive strength 13.1MPa, 7d compressive strength 15.5MPa, 28d compressive strength 18.7MPa.

[0057] Example 3 This embodiment provides a method for the joint disposal of solid waste resources. The raw materials in Group A include 30g of red mud and 70g of slag. The raw materials in Group B include 1% strong alkali, 60% water, 1% water-reducing agent and 10% water glass. Bayer process red mud is selected as red mud, sodium hydroxide as strong alkali, naphthalene-based water-reducing agent as water-reducing agent, sodium water glass as water glass, the modulus of water glass is 2.5, and the mass concentration of sodium metasilicate is 14.44%.

[0058] The method in this embodiment includes the following steps: Weigh out sodium silicate and sodium hydroxide, mix and stir until homogeneous, let stand for later use, stirring every 30 seconds to prevent sodium hydroxide from precipitating; weigh out slag and red mud, and grind the red mud and slag separately, grinding the red mud to a specific surface area of ​​1999 m². 2 / kg, slag ground to a specific surface area of ​​1130m²2 / kg, the ground red mud and 30% of the total slag were premixed, and 0.5% of the total raw materials of group A were added. The mixture was then ground in a high-energy ball mill at 400 r / min for 15 min. The remaining ground slag was then mixed with the composite particles in a fluidized bed air classifier to obtain the mixed raw materials of group A. Naphthalene-based water-reducing agent, water, sodium hydroxide and alkali activator were added in sequence. Each time a new component was added, it was mixed and stirred evenly to obtain the grouting material. Then, the mixture was stirred with a hand-held mixer every 5 min.

[0059] The data from the fluidity test, setting time determination, bleeding rate test, and 3d, 7d, and 28d strength tests are as follows: Flowability 275mm, initial setting time 6.5h, final setting time 17.0h, bleeding rate 1.6%, 3d compressive strength 12.6MPa, 7d compressive strength 16.5MPa, 28d compressive strength 18.1MPa.

[0060] Example 4 This embodiment provides a method for the joint disposal of solid waste resources. The raw materials of group A include red mud 30 and slag 70, and the raw materials of group B include strong alkali 3%, water 60%, water-reducing agent 1% and water glass 13%. Bayer process red mud is selected as red mud, sodium hydroxide as strong alkali, naphthalene-based water-reducing agent as water-reducing agent, sodium water glass as water glass, the modulus of water glass is 2.5, and the mass concentration of sodium metasilicate is 14.44%.

[0061] The method in this embodiment includes the following steps: Weigh out sodium silicate and sodium hydroxide, mix and stir until homogeneous, let stand for later use, stirring every 30 seconds to prevent sodium hydroxide from precipitating; weigh out slag and red mud, and grind the red mud and slag separately, grinding the red mud to a specific surface area of ​​1999 m². 2 / kg, slag ground to a specific surface area of ​​1130m² 2 / kg, the ground red mud and 30% of the total slag were premixed, and 0.5% of the total raw materials of group A were added. The mixture was then ground in a high-energy ball mill at 400 r / min for 15 min. The remaining ground slag was then mixed with the composite particles in a fluidized bed air classifier to obtain the mixed raw materials of group A. Naphthalene-based water-reducing agent, water, sodium hydroxide and alkali activator were added in sequence. Each time a new component was added, it was mixed and stirred evenly to obtain the grouting material. Then, the mixture was stirred with a hand-held mixer every 5 min.

[0062] The data from the fluidity test, setting time determination, bleeding rate test, and 3d, 7d, and 28d strength tests are as follows: Flowability 245mm, initial setting time 7h, final setting time 17h, bleeding rate 0.9%, 3d compressive strength 12.9MPa, 7d compressive strength 15.4MPa, 28d compressive strength 17.6MPa.

[0063] Example 5 This embodiment provides a method for the joint disposal of solid waste resources. The raw materials in Group A include 30g of red mud and 70g of slag, and the raw materials in Group B include 5% strong alkali, 60% water, 1% water-reducing agent and 11% water glass. Bayer process red mud is selected as red mud, sodium hydroxide as strong alkali, naphthalene-based water-reducing agent as water-reducing agent, sodium water glass as water glass, the water glass modulus is 2.5, and the sodium metasilicate mass concentration is 14.44%.

[0064] The method in this embodiment includes the following steps: Weigh out sodium silicate and sodium hydroxide, mix and stir until homogeneous, let stand for later use, stirring every 30 seconds to prevent sodium hydroxide from precipitating; weigh out slag and red mud, and grind the red mud and slag separately, grinding the red mud to a specific surface area of ​​1850 m² / g. 2 / kg, slag ground to a specific surface area of ​​1050m² 2 / kg, the ground red mud and 30% of the total slag were premixed, and 0.5% of the total raw materials of group A were added. The mixture was then ground in a high-energy ball mill at 400 r / min for 15 min. The remaining ground slag was then mixed with the composite particles in a fluidized bed air classifier to obtain the mixed raw materials of group A. Naphthalene-based water-reducing agent, water, sodium hydroxide and alkali activator were added in sequence. Each time a new component was added, it was mixed and stirred evenly to obtain the grouting material. Then, the mixture was stirred with a hand-held mixer every 5 min.

[0065] The data from the fluidity test, setting time determination, bleeding rate test, and 3d, 7d, and 28d strength tests are as follows: Flowability 220mm, initial setting time 7h, final setting time 18.5h, bleeding rate 0.7%, 3d compressive strength 10.8MPa, 7d compressive strength 14.5MPa, 28d compressive strength 17.7MPa.

[0066] Example 6 This embodiment provides a method for the joint disposal of solid waste resources. The raw materials in Group A include 30g of red mud and 70g of slag. The raw materials in Group B include 2% strong alkali, 50% water, 1% water-reducing agent and 10% water glass. Bayer process red mud is selected as red mud, sodium hydroxide as strong alkali, naphthalene-based water-reducing agent as water-reducing agent, sodium water glass as water glass, the modulus of water glass is 2.5, and the mass concentration of sodium metasilicate is 14.44%.

[0067] The method in this embodiment includes the following steps: Weigh out sodium silicate and sodium hydroxide, mix and stir until homogeneous, let stand for later use, stirring every 30 seconds to prevent sodium hydroxide from precipitating; weigh out slag and red mud, and grind the red mud and slag separately, grinding the red mud to a specific surface area of ​​1950 m² / g. 2 / kg, slag ground to a specific surface area of ​​1180m² 2 / kg, the ground red mud and 30% of the total slag were premixed, and 0.5% of the total raw materials of group A were added. The mixture was then ground in a high-energy ball mill at 400 r / min for 15 min. The remaining ground slag was then mixed with the composite particles in a fluidized bed air classifier to obtain the mixed raw materials of group A. Naphthalene-based water-reducing agent, water, sodium hydroxide and alkali activator were added in sequence. Each time a new component was added, it was mixed and stirred evenly to obtain the grouting material. Then, the mixture was stirred with a hand-held mixer every 5 min.

[0068] The data from the fluidity test, setting time determination, bleeding rate test, and 3d, 7d, and 28d strength tests are as follows: Flowability 215mm, initial setting time 7.5h, final setting time 18h, bleeding rate 0.8%, 3d compressive strength 11.5MPa, 7d compressive strength 15.5MPa, 28d compressive strength 17.2MPa.

[0069] Example 7 This embodiment provides a method for the joint disposal of solid waste resources. The raw materials in Group A include 30g of red mud and 70g of slag. The raw materials in Group B include 2% strong alkali, 70% water, 1% water-reducing agent and 10% water glass. Bayer process red mud is selected as red mud, sodium hydroxide as strong alkali, naphthalene-based water-reducing agent as water-reducing agent, sodium water glass as water glass, the water glass modulus is 2.5, and the sodium metasilicate mass concentration is 14.44%.

[0070] The method in this embodiment includes the following steps: Weigh out sodium silicate and sodium hydroxide, mix and stir until homogeneous, let stand for later use, stirring every 30 seconds to prevent sodium hydroxide from precipitating; weigh out slag and red mud, and grind the red mud and slag separately, grinding the red mud to a specific surface area of ​​1850 m² / g. 2 / kg, slag ground to a specific surface area of ​​1050m² 2 / kg, the ground red mud and 30% of the total slag were premixed, and 0.5% of the total raw materials of group A were added. The mixture was then ground in a high-energy ball mill at 400 r / min for 15 min. The remaining ground slag was then mixed with the composite particles in a fluidized bed air classifier to obtain the mixed raw materials of group A. Naphthalene-based water-reducing agent, water, sodium hydroxide and alkali activator were added in sequence. Each time a new component was added, it was mixed and stirred evenly to obtain the grouting material. Then, the mixture was stirred with a hand-held mixer every 5 min.

[0071] The data from the fluidity test, setting time determination, bleeding rate test, and 3d, 7d, and 28d strength tests are as follows: Flowability 310mm, initial setting time 6h, final setting time 16.5h, bleeding rate 2.8%, 3d compressive strength 11.8MPa, 7d compressive strength 15.8MPa, 28d compressive strength 17.3MPa.

[0072] Example 8 This embodiment provides a method for the joint disposal of solid waste resources. The raw materials in Group A include 30g of red mud and 70g of slag. The raw materials in Group B include 2% strong alkali, 60% water, 1% water-reducing agent and 10% water glass. Sintered red mud is selected as red mud, potassium hydroxide as strong alkali, polycarboxylate-based water-reducing agent as water-reducing agent, potassium water glass as water glass, the water glass modulus is 2.5, and the sodium metasilicate mass concentration is 14.44%.

[0073] The method in this embodiment includes the following steps: Weigh out sodium silicate and sodium hydroxide, mix and stir until homogeneous, let stand for later use, stirring every 30 seconds to prevent sodium hydroxide from precipitating; weigh out slag and red mud, and grind the red mud and slag separately, grinding the red mud to a specific surface area of ​​1999 m². 2 / kg, slag ground to a specific surface area of ​​1130m² 2 / kg, the ground red mud and 40% of the ground slag were premixed, and 1% of the total raw materials of group A were added as a weak alkaline activator (sodium metasilicate). The mixture was co-milled in a high-energy ball mill at 300 r / min for 20 min. The remaining ground slag was then mixed with the composite particles in a fluidized bed air classifier to obtain the mixed raw materials of group A. Naphthalene-based water-reducing agent, water, sodium hydroxide and alkaline activator were added in sequence. Each time a new component was added, it was mixed and stirred evenly to obtain the grouting material. Then, the mixture was stirred with a hand-held mixer every 5 min.

[0074] The data from the fluidity test, setting time determination, bleeding rate test, and 3d, 7d, and 28d strength tests are as follows: Flowability 270mm, initial setting time 7.5, final setting time 17.5, bleeding rate 1.0%, 3-day compressive strength 10.8MPa, 7-day compressive strength 15.6MPa, 28-day compressive strength 17.8MPa.

[0075] Example 9 This embodiment provides a method for the joint disposal of solid waste resources. The raw materials in Group A include 30g of red mud and 70g of slag, and the raw materials in Group B include 2% strong alkali, 60% water, 5% water-reducing agent and 15% water glass. Sintered red mud is selected as red mud, potassium hydroxide as strong alkali, polycarboxylate water-reducing agent as water-reducing agent, potassium water glass as water glass, the modulus of water glass is 1.5, and the mass concentration of sodium metasilicate is 30.32%.

[0076] The method in this embodiment includes the following steps: Weigh out sodium silicate and sodium hydroxide, mix and stir until homogeneous, then let stand for later use. Stir every 30 seconds to prevent sodium hydroxide from agglomerating. Weigh out slag and red mud, and grind the red mud and slag separately. Grind the red mud to a specific surface area of ​​1800 m² / g. 2 / kg, slag ground to a specific surface area of ​​1000m² 2 / kg, the ground red mud and 35% of the total slag were premixed, and 0.8% of the total raw materials of group A were added. The mixture was co-milled in a high-energy ball mill at 500 r / min for 120 min. The remaining ground slag was then mixed with the composite particles in a fluidized bed air classifier to obtain the mixed raw materials of group A. Naphthalene-based water-reducing agent, water, sodium hydroxide and alkali activator were added in sequence. Each time a new component was added, it was mixed and stirred evenly to obtain the grouting material. Then, the mixture was stirred with a hand-held mixer every 5 min.

[0077] The data from the fluidity test, setting time determination, bleeding rate test, and 3d, 7d, and 28d strength tests are as follows: Flowability 295mm, initial setting 8, final setting 17, bleeding rate 0.9%, 3-day compressive strength 11.2MPa, 7-day compressive strength 14.4MPa, 28-day compressive strength 18.6MPa.

[0078] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for the joint disposal of solid waste resources, characterized in that, The raw materials used include group A and group B. The method includes the following steps: Step 1: Mix water glass and strong alkali evenly, adjust the modulus of water glass to the target value, and obtain the alkali activator; Step 2: Mix red mud and slag to obtain raw material group A; Step 3: Add the water-reducing agent to the raw materials of group A and group B and mix them evenly to obtain the grouting material.

2. The method for joint disposal of solid waste resources according to claim 1, characterized in that, The raw materials in Group A consist of 30-48% red mud and 52-70% slag by mass percentage; the raw materials in Group B consist of 1-5% strong alkali, 50-70% water, 1-5% water-reducing agent and 10-15% water glass by mass percentage of the raw materials in Group A.

3. The method for joint disposal of solid waste resources according to claim 1, characterized in that, Step 2 includes the following steps: Step 21: Grind the red mud and slag separately; Step 22: Mix the ground red mud with the ground slag.

4. The method for joint disposal of solid waste resources according to claim 3, characterized in that, In step 21, the red mud is ground to a specific surface area of ​​1800~2000 m². 2 / kg, slag ground to a specific surface area of ​​1000~1200m² 2 / kg.

5. The method for joint disposal of solid waste resources according to claim 1, characterized in that, The red mud is either Bayer process red mud or sintering process red mud, or both.

6. The method for joint disposal of solid waste resources according to claim 1, characterized in that, The water glass is one or both of sodium water glass and potassium water glass.

7. The method for joint disposal of solid waste resources according to claim 6, characterized in that, The sodium silicate contains sodium metasilicate with a mass concentration of 14wt% to 35wt% and a modulus of 1.5 to 3.

5.

8. The method for joint disposal of solid waste resources according to claim 6, characterized in that, The potassium silicate contains potassium silicate with a mass concentration of 14wt% to 45wt% and a potassium silicate modulus of 1.5 to 3.

0.

9. The method for joint disposal of solid waste resources according to claim 1, characterized in that, The strong base is either sodium hydroxide or potassium hydroxide.

10. The method for joint disposal of solid waste resources according to claim 1, characterized in that, The water-reducing agent is one or both of polycarboxylate-based and naphthalene-based water-reducing agents.

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