52 results about "Tricalcium silicate" patented technology

The invention discloses copper selenide / tricalcium silicate bone cement. The bone cement comprises a liquid phase component and a solid phase component, the liquid phase component is water, and the solid phase component is tricalcium silicate powder and copper selenide nanoparticles. Compared with the existing tricalcium silicate bone cement, the tricalcium silicate bone cement has the advantages that by introducing a trace amount of copper selenide nanoparticles, not only can the hydration and coagulation time of tricalcium silicate be shortened, but also the porosity and degradation rate of the tricalcium silicate after coagulation and solidification can be reduced, the compressive strength can be improved, the stimulation effect on ALP activity of MC3T3-E1 cells can be enhanced, the survival rate of the MC3T3-E1 cells can be improved, and the application prospect is broad. The immunogenic apoptosis of K7M2-wt cells is promoted, and the tumor growth rate is reduced. Besides, the introduction of the copper selenide nanoparticles can also endow the tricalcium silicate bone cement with the performance of temperature rise under near-infrared light, so that in clinical application, the tricalcium silicate bone cement can be further combined with a near-infrared technology to realize ablation of bone tumors, and a new strategy is provided for treatment of the bone tumors.

The invention relates to an early strength concrete material for an expansion joint anchoring area and a preparation method thereof, and relates to the technical field of building materials, the early strength concrete material for the expansion joint anchoring area comprises the following components in parts by mass: gel master batch, coarse aggregate, fine aggregate, silica fume, mineral powder and a polycarboxylic acid water reducer; the gelling master batch is prepared from the following components in parts by mass: tricalcium silicate, anhydrous calcium sulphoaluminate, polyvinyl alcohol, polypropylene fiber and water; the preparation method comprises the steps of gelling master batch preparation, shearing and flaking, and mixing and forming. According to the early-strength concrete material for the expansion joint anchoring area and the preparation method of the early-strength concrete material, the concrete in the anchoring area is modified by using an organic matter as a crystal nucleus, so that a compact and ordered organic-inorganic cross-linked structure with a biomimetic structure is formed, and the early-strength performance and tensile toughness of the concrete are remarkably improved.

The invention belongs to the technical field of building materials, and particularly relates to a low-calcium carbon sequestration cementing material as well as a preparation method and application thereof. The low-calcium carbon sequestration cementing material disclosed by the invention is prepared from the following main mineral components in percentage by weight: 55 to 80 percent of calcium silicate, 15 to 35 percent of tricalcium disilicate and 5 to 15 percent of gehlenite. The low-calcium carbon-sequestration cementing material has excellent carbonization activity, can seal a large amount of carbon dioxide, can obtain excellent mechanical properties in a short time, and provides a new way for solving the problem of carbon emission in the cement industry and recycling industrial solid wastes such as magnesium slag and fly ash.

The application discloses a low-carbon high-performance cement clinker and a preparation method thereof, and relates to the technical field of building materials, in particular to a low-carbon cement clinker and a preparation method thereof. The raw materials in the cement clinker include the following components in percentage by weight: 75-90% of raw material, 5-20% of steel slag and 2-8% of a conditioning material, wherein the conditioning material includes at least two of lead-zinc slag, copper slag, manganese slag and lithium slag. The lead-zinc slag in the conditioning material contains 0-5.5% of ZnO in percentage by weight; the copper slag contains 0-2.0% of CuO in percentage by weight; the manganese slag contains 0-7.0% of MnO2 in percentage by weight; and the lithium slag contains 0-3.0% of Li2O in percentage by weight. The application adds the conditioning material, ensures the content of zinc, copper, manganese or lithium in the cement clinker, realizes the purposes of stabilizing R-type tricalcium silicate and improving the strength of the cement clinker, does not add components such as fluorine and sulfur which pollute the environment, is environmentally-friendly, safe and reliable, and has a wide source of raw materials and strong applicability.

The invention relates to the technical field of building materials, and particularly discloses sulfur-aluminum-iron series cement and a preparation method thereof. The sulfur-aluminum-iron series cement is prepared from the following raw materials: 55 to 65 parts of sulfur-aluminum-iron series cement clinker, 10 to 15 parts of gypsum, 5 to 10 parts of silane modified metakaolin, 10 to 15 parts of superfine slag powder, 3 to 5 parts of filler and 1 part of surface modified graphene dispersion liquid, the sulfur-aluminum-iron series cement clinker comprises the following mineral components: 25%-30% of anhydrous calcium sulphoaluminate, 20%-25% of tetra calcium aluminoferrite, 15%-20% of dicalcium silicate, 5%-8% of tricalcium silicate and less than or equal to 1.5% of free calcium oxide. The mechanical property of a cement system is improved by limiting the mineral components and proportion of the sulfur-aluminum-iron series cement clinker; the active admixture and the filler are adopted to fill internal capillary pores of a cement system, so that erosion medium invasion channels are reduced, the compactness is enhanced, and meanwhile, the structure of a hydration product is optimized.

The application discloses an expanding root canal filling medical device combination based on a dental root tip biological seal and application. The medical device combination comprises a sealant combination and a titanium material root canal plug tip, the sealant combination is composed of liquid agent, A component powder and B component powder which are mutually isolated before use, the A component powder comprises 75-95% of tricalcium silicate and 5-25% of beta tricalcium phosphate, the B component powder comprises 45-55% of nano zirconium dioxide, 44.7-52% of calcium hydroxide and 0.3-3% of calcium oxide; a root canal section surface of the root canal plug tip is provided with a horizontal screw thread, a screw thread groove of the screw thread is used for filling the prepared sealant, and a crown section surface is provided with a retaining groove section. The medical device combination solves the problems of root canal treatment failure or poor long-term curative effect caused by volume shrinkage after filling of the existing sealant and gutta-percha tip, and can realize high safety, high biocompatibility, high quality and high density root canal filling.

The application discloses a preparation method of waste wood regenerated aggregate concrete, which comprises the following steps: (1) diluting glycerol with anhydrous ethanol to form a base solution, and then adding magnesium potassium phosphate cement, tricalcium silicate powder, sodium alginate powder and fly ash into the base solution to uniformly disperse and form a slurry; then, the slurry is coated on the surface of wood aggregate, and after being dried, modified wood aggregate is obtained; (2) mixing basalt fibers with an alkali solution and then performing heat preservation, and after completion, the basalt fibers are washed to obtain modified basalt fibers; then, the modified basalt fibers, the modified wood aggregate, ordinary Portland cement, gravel, sand, fly ash, a water reducing agent and mixing water are uniformly mixed to obtain a concrete slurry. The technical scheme of the application effectively improves the strength of the concrete containing wood aggregate, and is beneficial to promoting the popularization and application of waste wood in concrete.

This invention belongs to the field of building materials technology. Specifically, it discloses a glaze for preventing ceramic tile deformation and an anti-deformation ceramic tile, comprising the following raw materials in parts by weight: 15-30 parts spodumene, 15-30 parts calcite, 12-20 parts bauxite, 8-15 parts pyrophyllite, 6-12 parts modified magnesium borate whiskers, 5-9 parts wet-process mica powder, 3-6 parts palygorskite, 1-2.5 parts calcium borate, 1-2 parts tricalcium silicate, and 0.2-0.7 parts ammonium fluoride. The system of this invention uses spodumene, calcite, bauxite, and pyrophyllite as the matrix minerals, effectively lowering the sintering temperature and providing basic strength to the system. At a lower firing temperature, a high degree of sintering of the glaze layer can be ensured, preventing sintering failure of other materials. By adding modified magnesium borate whiskers and wet-process mica powder, the flexural strength is effectively improved.

The application discloses a kind of high-strength slow-setting silicate cement clinker and preparation method thereof, its mineral composition includes C3S>63%, C2S 1.09%‑13.39%, C3A<4.7%, C4AF 13.73%‑14.36%, free calcium oxide content in clinker is below 1.5%.The application reduces aluminum rate from the angle of mineral composition design, improves limestone saturation coefficient, and prepares a kind of low alumina tricalcium (C3A<4.7%), high silicate tricalcium (C3S>63%) clinker using industrial solid waste coal gangue, which can be prepared under existing cement production process, and has the characteristics of high strength, stable expansion and shrinkage performance, low early hydration heat release, long setting time and easy to control, etc.

The application relates to the technical field of building materials, and particularly discloses a sulphur-aluminum-iron cement and a preparation method thereof. The sulphur-aluminum-iron cement comprises the following raw materials: 55-65 parts of sulphur-aluminum-iron cement clinker, 10-15 parts of gypsum, 5-10 parts of silane modified metakaolin, 10-15 parts of superfine slag powder, 3-5 parts of filling material and 1 part of surface modified graphene dispersion liquid. The sulphur-aluminum-iron cement clinker comprises the following mineral components: 32-38% of anhydrous calcium sulphoaluminate, 26-32% of tetracalcium aluminoferrite, 20-26% of dicalcium silicate, 6-10% of tricalcium silicate and less than or equal to 1.5% of free calcium oxide. The application limits the mineral components and the proportion of the sulphur-aluminum-iron cement clinker, so that the mechanical properties of the cement system are improved; the active admixture and the filling material are used to fill the internal capillary holes of the cement system, the invasion channels of the erosion medium are reduced, the compactness is enhanced, and the structure of the hydration product is optimized.

The present invention relates to a phosphogypsum modified material for highways under a new excitation system, and a preparation method and device thereof, belonging to the technical field of highway engineering in transportation engineering. The modified material comprises the following raw materials in weight percentage: 80% to 90% phosphogypsum, 10% to 20% modifier, totaling 100%; it also comprises water, the mass of which is 15% to 18% of the total mass of the phosphogypsum and the activator; the modifier comprises the following raw materials: calcium oxide, silicon dioxide, ferric oxide, aluminum oxide, mineral powder, tricalcium silicate, calcium carbonate, sodium silicate, coupling agent, iron powder, and rubber powder. The phosphogypsum modified material of the present invention also exhibits the advantages of excellent strength growth and improved stability in terms of long-term performance development, is highly environmentally friendly, does not pollute the environment, soil, and water bodies, and is economical, does not increase the overall cost of the project, and is easy to promote and apply.

The invention relates to the technical field of cement admixtures, in particular to a high-temperature reinforced and toughened oil well cement admixture and a preparation method thereof. The toughening agent is prepared on the basis of polyimide fibers with the surfaces grafted with tricalcium silicate, wollastonite fibers and mullite whiskers; preparing a high-temperature stabilizer based on the calcined shale powder and nano aluminum oxide; preparing a dispersing agent; the carbon nanotubes and the halloysite nanotubes are modified, meanwhile, the modification process is adjusted in real time to improve the modification effect, and reinforcing and toughening components are prepared; and finally, mixing according to a preset proportion to obtain the high-temperature reinforced and toughened oil well cement admixture. The cement admixture disclosed by the invention is composed of the toughening agent, the high-temperature stabilizer, the dispersing agent and the reinforcing and toughening component, and the cement admixture can effectively improve the high-temperature reinforcing and toughening effect of oil well cement.

The present invention discloses a method for preparing general-purpose Portland cement clinker using ferronickel slag leaching residue, relating to the fields of environmental protection and building materials. The method comprises: first, mixing ferronickel slag sulfuric acid leaching residue with blast furnace slag, lime, and a regulator, ball-milling the mixture, and then calcining it at high temperature; then rapidly cooling the calcined product; and finally grinding it to produce Portland cement clinker. The present invention utilizes a high-temperature multiphase reaction to convert the raw material into a cement phase containing active components such as tricalcium silicate, dicalcium silicate, and tetracalcium aluminoferrite. The ferronickel slag sulfuric acid leaching residue has a very small particle size and does not require grinding, allowing for large amounts of slag to be added and easily burned through. The main performance indicators of the produced Portland cement clinker meet the national standards for general-purpose Portland cement clinker. The present invention has important reference value for reducing the amount of ferronickel slag and has excellent market prospects and promotion value.

This invention is related to a cement clinker formed by firing raw meal prepared with new and improved raw meal minerals. This new cement clinker is a hydraulically activated cement clinker which can contain alite (tricalcium silicate) and aH' dicalcium silicate phase together with boron and fluorine doping and can be fired at lower temperatures and has lower carbon dioxide emission.

The invention provides a tailing-based controlled release type soil conditioner, and relates to the field of solid waste recycling. Comprising a silicon-calcium-magnesium alkaline core and a coating layer arranged on the surface of the silicon-calcium-magnesium alkaline core, the coating layer comprises an iron-aluminum controlled release layer and a silicon-calcium-magnesium alkaline layer which are sequentially and alternately stacked, and the outermost layer of the coating layer is the iron-aluminum controlled release layer; each of the silicon-calcium-magnesium alkaline core and the silicon-calcium-magnesium alkaline layer comprises a silicon-calcium-magnesium alkaline material and a first binder; the silicon-calcium-magnesium alkaline material comprises the following components: calcium silicate, dicalcium silicate, tricalcium silicate, diopside, enstatite, forsterite, calcium-magnesium melilite and calcium-aluminum melilite; the iron-aluminum controlled release layer comprises an iron-aluminum controlled release material and a second binder; the iron and aluminum controlled release material is prepared from alpha-FeOOH and gamma-AlOOH; the silicon-calcium-magnesium alkaline material and the iron-aluminum controlled-release material are both prepared from tailings. According to the tailing-based controlled release type soil conditioner, valuable elements in tailings are fully utilized, and controllable release of valuable components in soil with different pH values can be achieved.

This invention discloses a method and system for online reconstruction of mineral phases in high-temperature steel slag, belonging to the field of steel slag resource utilization technology. The method involves crushing coal gangue and room-temperature steel slag to a particle size of 0.5 to 3 mm, mixing them at a mass ratio of 1:0.5 to 1.5 to prepare a reconstruction adjuster, and then adding the reconstruction adjuster and high-temperature liquid steel slag (temperature above 1350℃) to a mixing furnace at a mass ratio of 0.1 to 0.5:1. After settling, the mineral phase reconstruction is completed, converting free calcium oxide into dicalcium silicate and tricalcium silicate, magnesium oxide, ferrous oxide, and manganese oxide into the RO phase, and ferric oxide into ferrous oxide and elemental iron. The mixture after the reaction is cooled to below 500℃, then crushed, magnetically separated, and ground to a specific surface area of ​​400 square meters per kilogram to obtain a cementitious material. This invention utilizes the sensible heat of the high-temperature steel slag itself, eliminating the need for additional heating, achieving high-value utilization of solid waste. The prepared cementitious material exhibits high hydration activity and good volume stability. The process is simple and easy to implement, contributing to the metallurgical industry's achievement of dual-carbon goals.

The invention discloses a solid waste-based self-healing mine filling material and a preparation method and application thereof, and belongs to the technical field of solid waste resource utilization, the solid waste-based self-healing mine filling material comprises the following components by weight: 35-40% of a solid waste-based material, 2-3% of a self-healing master batch A, 3-5% of a self-healing master batch B, 8-13% of semi-dry desulfurization ash, and 40-50% of tailing sand; when crack water seepage occurs after hydration of the solid-waste-based self-healing mine filling material is completed, a silanol group of sodium methyl silicate in the self-healing master batch B and dicalcium silicate and tricalcium silicate in the solid-waste-based cementing material are subjected to a dehydration cross-linking reaction, and anti-permeability silicate with an anti-capillary effect is formed; the excessive anti-permeability silicate is further dissolved and reacted by the polyether silicone oil to form a charge reduction-anti-permeability composite material, so that capillary channels are sealed while internal gaps are filled, and the compactness of the mine filling material hydrate is further improved.

The application discloses an injectable anti-disintegration paste material and a preparation method and application thereof, and belongs to the field of biomedical materials. The paste material comprises a powder component and a liquid component. The powder component comprises tricalcium silicate powder, beta-tricalcium phosphate powder and anhydrous calcium dihydrogen phosphate. The liquid component is a hydroxypropyl methylcellulose aqueous solution with a mass percentage concentration of 1-3%. The mass ratio of the powder component to the liquid component of the paste material is 1.5-2.5:1. The prepared injectable anti-disintegration paste material has excellent anti-disintegration performance and injection performance, can be self-cured quickly, is convenient to operate and easy to fill, can prevent the paste from being eroded by a water-containing environment, can induce the generation of bone-like hydroxyapatite, and can be used in the field of dental repair such as pulp capping, root tip shaping and root canal treatment.

The system and method for extracting aluminum from high-aluminum fly ash by alkali method and preparing carbon dioxide adsorbent from waste residue belong to the field of comprehensive treatment of fly ash. The system comprises an alkali method pre-desilication reactor, a hydrothermal alkali method aluminum extraction reactor, a carbonization aluminum extraction reactor, an aluminum product calcining furnace, a silicon-rich alkali liquor regeneration reactor, an aluminum extraction waste liquid regeneration reactor, a solid waste-based carbon dioxide adsorbent calcining furnace and a solid-liquid separation device. Through the double steps of alkali leaching and carbonization aluminum extraction, the present application can efficiently extract aluminum elements from fly ash, greatly improving the resource utilization rate. While extracting aluminum elements and producing aluminum hydroxide products, the present application also fully utilizes the calcium and silicon-rich waste residue produced during the reaction process. Through calcination treatment, these waste residues are converted into calcium oxide, tricalcium silicate and dicalcium silicate with excellent carbon dioxide adsorption capacity, and then efficient carbon dioxide adsorbent is prepared, realizing real waste resource utilization.

The application provides a fast-hardening steel slag concrete and a preparation method and component determination method thereof, and relates to the technical field of concrete pavement construction.The fast-hardening steel slag concrete comprises the following components in parts by mass: cement 180-250 parts, coarse steel slag 440-570 parts, steel slag sand 300-370 parts, steel slag powder 0-30 parts, polypropylene fiber 0.2-0.3 parts, water 95-120 parts and additive 7-10 parts; the additive comprises a composite early strength agent and a water reducing agent; the mass ratio of the composite early strength agent to the water reducing agent is 2.2-3.2:0.8-1.5; and the composite early strength agent is anhydrous sodium sulfate and triethanolamine.In the application, the steel slag contains tricalcium silicate, dicalcium silicate, free calcium oxide and free magnesium oxide, has cementitious activity, micro-expansibility and high later strength, and can replace aggregates or cementitious materials to prepare the concrete, so that shrinkage deformation and later strength loss of the concrete can be avoided.

Materials for additive manufacturing. More precisely, a non-breaking filament, preferably for 3D printing bone substitutes. The filament includes 50% to 99% in weight to the total weight of the filament (w / w) of a polymeric matrix and 1% to 50% w / w of tricalcium silicate. Also, a method and composition for preparing the filament. Additionally, the uses of the filament, such as for example in the dental field; especially, for providing suitable bone and dental substitutes.

The invention discloses a tricalcium silicate cement composite silica sol combined iron runner castable and a preparation method thereof, and the castable mainly comprises the following components by mass percentage: 10-17 wt% of fused compact corundum, 7-13 wt% of composite micro powder, 12-21 wt% of silicon carbide, 0.5-2 wt% of tricalcium silicate cement, 0.5-3 wt% of spherical asphalt, 0.1-0.2 wt% of explosion-proof fiber, 2-5 wt% of a composite additive, and the balance of brown fused alumina particles, the silica sol accounts for 2-5wt% of the main components by using an external additive; wherein the tricalcium silicate cement is prepared by reacting nano calcium carbonate with high-purity silica powder. The core of the invention is that the tricalcium silicate cement and the silica sol are prepared to form a composite combination system, so that the castable has excellent rapid hardening property and explosion-proof property, the hydrated phase is fine and uniform, and the rapid construction requirement is met; a hydration phase uniformly distributed at a high temperature reacts with aluminum oxide in the matrix to promote densification and optimize a pore structure, and meanwhile, nano silicon dioxide in the silica sol promotes generation of a mullite phase in the matrix, so that the high-temperature breaking strength, oxidation resistance and slag corrosion resistance of the castable are remarkably improved.

The invention relates to the technical field of concrete preparation, and discloses an ultra-high performance concrete preparation method, which comprises: 1, raw material selection; 2, designing a mix proportion; 3, stirring the raw materials; fourthly, pouring forming is conducted; and step 5, curing. Preferably, the raw material selection comprises cement which is generally Portland cement, the specific surface area of the cement should be controlled to be 300-400 m / kg, the content of tricalcium silicate is controlled to be 50%-60%, and the content of dicalcium silicate is controlled to be 15%-25%. A low water-binder ratio design of less than or equal to 0.20 and a fiber reinforced system are matched, so that the internal porosity of the concrete is effectively reduced, and the compactness is improved. The compressive strength, the tensile strength and the toughness of the finished UHPC are far better than those of common concrete, the requirements of large-span and high-load engineering can be met, meanwhile, the section size of a component can be reduced, the lightweight design of the structure is achieved, and the overall self-weight and material consumption of the engineering are reduced.

The application provides an oil well cement early strength agent and cement slurry, which comprises the following components in parts by weight: 1.0-8.0 parts of nanocrystalline seeds, 1-8.0 parts of formamide, 1.0-8.0 parts of alcohol amine organic compounds, 5.0-20.0 parts of sulfate, 1.0-8.0 parts of dispersants and 5.0-25.0 parts of mixed alkali. The application accelerates the setting and strength development of cement by the reaction of sulfate and calcium ions in cement to form calcium sulfate crystals which are beneficial to the hydration reaction of cement; the nanocrystalline seeds provide the basis for the formation of C-S-H gel through the effect of crystal nucleus, accelerate the hydration reaction of tricalcium silicate and dicalcium silicate in cement, and rapidly react with water molecules to release heat due to the large surface area and high activity, thereby promoting the rapid formation of C-S-H gel, improving the early strength, optimizing the microstructure, reducing the porosity, improving the interface transition zone and promoting the closer interface combination.

The invention provides a pulp capping material comprising bioactive glass fibers, mesoporous tricalcium silicate, and zirconia dioxide. The initial setting time of this pulp capping material can be reduced to 7 minutes. The material exhibits no significant cytotoxicity and can significantly enhance cell viability. Additionally, it increases the expression of alkaline phosphatase and Dentin Sialophosphoprotein mineralization genes in dental pulp stem cells.

The invention relates to the technical field of building materials, in particular to quick-drying cement-based repair mortar and a preparation method thereof, and the quick-drying cement-based repair mortar comprises the following raw materials in parts by weight: 45-55 parts of a base material, 25-35 parts of aggregate, 5-10 parts of an additive solution, 3-5 parts of an additive, 1-1.5 parts of a water reducing agent, 0.5-1 part of a defoaming agent and 0.5-1 part of a retarder. According to the invention, the base material is rich in high-activity anhydrous minerals such as tricalcium silicate sensitive to moisture, a rapid hydration skeleton foundation is provided for the mortar, the powder material is the base material and exerts high activity without interference in a rapid drying stage so as to remove obstacles, calcium nitrate can accelerate a hydration-precipitation reaction chain of a key mineral phase, the coagulation time is obviously shortened, and the mortar has the advantages of high strength, good water resistance and good water resistance. Cellulose and silk form a hydrophilic fiber network, water locking and slurry fixing are carried out in the plastic stage of the mortar, the whole mortar system can form good early strength in a short time, and the defect that a repaired area is prone to being damaged by pedestrians and non-motor vehicles in the early stage is overcome.

The invention relates to the technical field of dental implants, in particular to a dental implant, a surface treatment method of the dental implant and a composite material for the dental implant. The surface treatment method of the dental implant comprises the following steps: uniformly mixing zirconium oxide, tricalcium phosphate, monocalcium phosphate, tricalcium silicate, calcium hydroxide, triclosan and polyethylene glycol according to a preset proportion to obtain an initial mixture; grinding the initial mixed material to obtain a composite material; carrying out sand blasting-acid etching treatment on the cleaned and pretreated dental implant, and cleaning and drying; and coating the surface of the cleaned and dried dental implant with the composite material to finish surface treatment. According to the treatment method, the antibacterial property and hydrophilicity of the dental implant can be improved.

The invention discloses a resource utilization method for synergic steelmaking production and antibiotic decoction dregs, which is characterized in that high-temperature liquid-state steel slag generated in a converter steelmaking production process is used for synergic treatment of the antibiotic decoction dregs, and alkaline minerals and high temperature of the converter steel slag are used for inactivation treatment of the antibiotic decoction dregs; reducing heavy metal compounds in the antibiotic medicine residues by using organic matters in the antibiotic medicine residues, so that the heavy metal compounds are molten into dispersed metal droplets in the converter steel slag, and harmless conversion of heavy metals in the antibiotic medicine residues is completed; f-CaO and tricalcium silicate in the converter steel slag react with arsenide in the antibiotic medicine residues to generate calcium arsenate, and harmless conversion of the arsenide in the antibiotic medicine residues is achieved.

The application provides a tailing-based controlled release soil conditioner, and relates to the field of solid waste recycling.The tailing-based controlled release soil conditioner comprises a silico-calcium-magnesium alkaline core and a coating layer arranged on the surface of the silico-calcium-magnesium alkaline core, the coating layer comprises iron-aluminum controlled release layers and silico-calcium-magnesium alkaline layers arranged alternately in sequence, and the outermost layer of the coating layer is an iron-aluminum controlled release layer; the silico-calcium-magnesium alkaline core and the silico-calcium-magnesium alkaline layers both comprise silico-calcium-magnesium alkaline materials and first binders; the components of the silico-calcium-magnesium alkaline materials comprise calcium silicate, dicalcium silicate, tricalcium silicate, diopside, enstatine, montresorite, calcium-magnesium melilite and calcium-aluminum melilite; the iron-aluminum controlled release layers comprise iron-aluminum controlled release materials and second binders; the iron-aluminum controlled release materials comprise alpha-FeOOH and gamma-AlOOH; and the silico-calcium-magnesium alkaline materials and the iron-aluminum controlled release materials are both prepared from tailings.The tailing-based controlled release soil conditioner makes full use of valuable elements in tailings, and can realize controllable release of valuable components in different soil of different pH values.

The application discloses a preparation method of a cement mineral-water glass composite grouting material, and comprises the following steps: (1) dispersing graphene oxide in isopropyl alcohol, then adding glassy calcium silicate particles, stirring to uniformly coat the graphene oxide on the surface of the glassy calcium silicate particles, adding nano silicon dioxide after mixing, and then performing solid-liquid separation to obtain a solid product for standby; (2) adding the solid product into a saturated sodium hydroxide and / or potassium hydroxide solution, then heating and keeping warm, performing solid-liquid separation after completion, and obtaining sodium and / or potassium silicate-graphene oxide-glassy calcium silicate; (3) mixing the sodium and / or potassium silicate-graphene oxide-glassy calcium silicate with cement mineral tricalcium silicate, dicalcium silicate and water, and then uniformly mixing to obtain the composite grouting material. The application effectively avoids the problems of traditional cement-water glass double-liquid grouting materials, such as easy dissociation of water glass, unstable performance of the grouting material and strength deterioration.