107 results about "Free calcium" patented technology

The invention discloses a tooth repair composition containing mesoporous hydroxyapatite, a tooth repair product and a preparation method and application of the tooth repair composition and the tooth repair product. The tooth repair composition comprises nano-hydroxyapatite, fluoride and a chelating agent, the logarithm value logK of the stability constant K of the chelating agent to calcium ions is 1 < = logK < = 5, and K is measured in an aqueous solution with the temperature of 25 DEG C, the pH value of 7.0 and the ionic strength of 0.1 M; the nano-hydroxyapatite is prepared from nano-scale mesoporous hydroxyapatite, and the nano-hydroxyapatite contains nano-scale mesoporous hydroxyapatite. By adding the specific chelating agent, dynamic balance is formed in the tooth repairing composition, slow release protection can be formed on free calcium ions, the double inactivation effect possibly occurring when hydroxyapatite and fluoride exist at the same time is effectively avoided, the synergistic repairing effect of hydroxyapatite and fluoride is fully exerted, and the tooth repairing effect is improved. The use of fluorides can be greatly reduced, and safety and reliability are achieved.

The invention provides a preparation method of a calcium emulsifying and embedding system with high bioaccessibility, which comprises the following steps: S1) heating and mixing biomacromolecules and an emulsifier in water to obtain a water phase; the biomacromolecules are protein colloids and / or polysaccharide colloids; the method comprises the following steps: heating and mixing a calcium source substance and anhydrous cream to obtain an oil-solid phase; and S2) mixing the oil-solid phase with a water phase, and emulsifying to obtain the calcium emulsifying and embedding system. Compared with the prior art, the preparation method has the advantages that the natural macromolecular protein and / or polysaccharide with high nutritional value is used as a carrier, the calcium source substance is embedded through a water-oil-solid three-phase emulsification technology, and the preparation method is simple, easy to operate, low in cost and environmentally friendly; in addition, a water-oil-solid three-phase homogenized emulsion is created, the problem that the dispersion stability of milk mineral salt in a liquid food matrix is poor is effectively solved, release of free calcium ions in the small intestine environment can be promoted, and the calcium bioaccessibility is remarkably improved.

The invention discloses a urease-producing microorganism induced calcium carbonate deposition solution for foundation reinforcement and a preparation method and application thereof, and belongs to the technical field of foundation reinforcement. The urease-producing microorganism induced calcium carbonate deposition solution comprises a bacterial solution, a cementing solution and a sodium citrate solution, the bacterial liquid comprises bacteria capable of generating urease and citrobacter freundii. Sodium citrate in the urease-producing microorganism induced calcium carbonate deposition solution can chelate free calcium ions in advance, the concentration of the free calcium ions is reduced, the risk of precipitation at an injection port in the single-phase injection process is eliminated, and the solution can smoothly permeate into a deep layer; citrobacter freundii produces acid through metabolism and utilizes citric acid radicals through metabolism to ensure gradual release of calcium ions, so that uniform deposition of calcium carbonate is triggered. Through the synergistic effect of sodium citrate chelated calcium ions and citrobacter freundii metabolism, the solution can be uniformly distributed in the soil sample, and the problem of uniformity of single-phase perfusion is successfully solved.

The invention discloses low-hydration-heat iron aluminate cement and a preparation method thereof, and belongs to the technical field of maritime work cement, and the low-hydration-heat iron aluminate cement comprises 70-85 parts of iron aluminate cement clinker, 5-7 parts of a bio-based retarder, 4-8 parts of a nano friction regulator, 3-4.5 parts of a microcapsule dual repair agent, 5-10 parts of gypsum and 15-25 parts of a mixed material. The fucoidan polysaccharide sulfate and calcium ions in a cement hydration product form a complex through sulfate groups in molecules of the fucoidan polysaccharide sulfate, and further hydration of cement particles is prevented, so that the early heat release rate is effectively reduced, temperature cracks are prevented from being generated in a concrete structure, and the stability and durability of the structure are improved. According to the microcapsule dual-repairing agent, the problem of delayed volume expansion of the steel slag powder caused by fluctuation of the content of free calcium oxide is effectively solved through the matching effect of the inner-layer repairing agent and the outer-layer carrier. According to the gradient clinker sintering process, mineral distribution and chemical reaction paths in clinker are optimized, so that the generation amount of cement hydration heat is remarkably reduced, and meanwhile, the thermal stability of slurry is improved.

The invention provides a capillary crystalline waterproof material with ultrahigh osmotic pressure resistance, and relates to the field of waterproof materials. The capillary crystalline waterproof material with ultrahigh osmotic pressure resistance is prepared from the following raw materials in percentage by weight: 40 to 60 percent of Portland cement, 1 to 10 percent of fly ash, 30 to 50 percent of quartz sand, 1 to 10 percent of hydroxyl modified molecular sieve crystallization master batch, 0.2 to 1 percent of water reducing agent, 0.1 to 0.5 percent of retarder, 0.1 to 0.5 percent of anti-cracking agent and 0.1 to 1 percent of defoaming agent, the preparation process comprises the following steps: firstly, premixing the Portland cement, the quartz sand and the fly ash; according to the capillary crystalline waterproof material with the ultrahigh osmotic pressure resistance, the CCCW coating has certain moisture inside by utilizing the ultra-large specific surface area of the molecular sieve, the moisture is released to participate in a hydration reaction and capture free calcium at the same time, and electron microscope characterization finds that a large number of crisscrossed needle-shaped or linear crystals are formed inside; a layer-by-layer overlapped net structure taking the molecular sieve as a framework is formed, and the anti-permeability performance is remarkably improved to 3.8 MPa.

The invention relates to the technical field of building materials, and particularly discloses high-strength water-resistant anti-freezing plastering spraying mortar and a preparation method thereof. The high-strength waterproof anti-freezing plastering spraying mortar is prepared from the following raw materials in percentage by mass: 2.5 percent to 9.3 percent of high-free calcium belite sulphoaluminate clinker, 20 percent to 50 percent of gypsum, 9.4 percent to 56.5 percent of granulated blast furnace slag powder and 8 percent to 34 percent of lightweight aggregate. Through the design of the high-free-calcium belite sulphoaluminate clinker and the raw material design of the high-strength water-resistant anti-freezing plastering spraying mortar, the high-free-calcium belite sulphoaluminate clinker and the granulated blast-furnace slag powder have a synergistic effect, so that the types, the composition and the microstructure of hydration products of a gypsum-based material can be improved; the water-resistant and high-strength hydration products ettringite and C-(A)-S-H are greatly increased, and dense coating of the ettringite and C-(A)-S-H on dihydrate gypsum is realized, so that the problems of poor water resistance, poor freezing resistance and low strength of gypsum-based mortar are solved.

The invention discloses equipment and a method for removing free calcium oxide in steel slag, adding acid, washing and circulating, and relates to the technical field of industrial solid waste recycling. The equipment comprises a multi-stage cleaning module, an acid liquor dynamic adjusting system, a water circulation filtering module and an intelligent control unit. Steel slag is sequentially fed into the pre-washing cavity section filled with water under pressure through the spiral conveying mechanism, a pickling solution prepared through ultrasonic waves is added into the neutralization reaction cavity section through the control valve, and the concentration of the pickling solution is regulated and controlled in real time in combination with the pH sensor. And the acid liquor is recycled by utilizing a centrifugal separation and membrane filtration technology or a flocculation precipitation technology. The innovativeness is as follows: ultrasonic oscillation and acid pickling are combined, so that the reaction efficiency of free CaO / MgO is improved; matching steel slag component characteristics by adopting a gradient pickling process; a combined pressurized water circulation system is developed to efficiently treat free calcium oxide and synchronously treat suspended matters and heavy metal ions; and the integrated intelligent control system realizes adaptive adjustment of process parameters.

The invention provides a clinker-free cement activator, and relates to the field of cement activators. According to the present invention, the high-performance fly ash geopolymer cement with characteristics of low cost, high strength and baking-free property and the product thereof can be prepared, the fly ash geopolymer cement of different grades can be produced according to the quality and the use amount of the fly ash, and the high-performance cement product can be prepared by using the cement through a certain means and process, the clinker-free calcium-containing substance / low-calcium fly ash composite cement can completely replace corresponding cement products of 32.5 R or 42.5 R Portland cement, has considerable economic and social benefits, can fully stimulate the activity of calcium-containing substance / low-calcium fly ash, effectively improves the early strength of the clinker-free calcium-containing substance / low-calcium fly ash composite cement, shortens the setting time, reduces the energy consumption, improves the quality and yield of the cement, and reduces the cost of the cement. In addition, the mixing amount of the fly ash in the clinker-free composite cement can be increased, and as the fly ash is a waste, the multipurpose fly ash can reduce pollutant emission, protect the environment, turn waste into wealth and realize comprehensive utilization of resources.

The invention relates to the technical field of asphalt pavement materials, in particular to an RAP-steel slag emulsified asphalt cold recycled mixture volume expansion inhibition method. The method comprises the following steps: firstly, pretreating a selected steel slag sample, and preparing a silicon tetrachloride solution to soak the steel slag; then, the soaked steel slag is taken out and placed in a curing box to be cured, and the pH of the cured steel slag is adjusted; and finally, detecting the expansion rate of the RAP-steel slag emulsified asphalt cold-recycled mixture and the content of free calcium oxide in the RAP-steel slag emulsified asphalt cold-recycled mixture according to specifications, evaluating the volume expansion inhibition effect of the method on the cold-recycled mixture, and based on the further optimization scheme, providing the efficient volume expansion inhibition method for the RAP-steel slag emulsified asphalt cold-recycled mixture. Therefore, the steel slag can be better applied to the asphalt pavement, and the road performance is improved while the solid waste steel slag is fully utilized.

1. Name of the designed product: medicine packing box (0.6g sugar-free calcium acetate granule). 2. Use of the designed product: used for packing sugar-free calcium acetate granule. 3. Design points of the designed product: in the pattern. 4. Picture or photo best indicating the design points: front view.

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 utility model belongs to the technical field of removal of dense free calcium oxide on the surface of a waste ladle brick, and discloses a high-pressure hot-stewing device for dense free calcium oxide on the surface of a waste ladle brick, which is fixedly arranged at a corresponding position on the right side of a telescopic mechanism bracket, and a hopper is fixedly arranged at the upper part of a chain scraper conveyor; the chain scraper conveyor is fixedly arranged at the bottom of the high-pressure hot stewing box; the booster pump is longitudinally and fixedly arranged at the bottom of the left side of the telescopic mechanism bracket; the pressure sensor is fixedly arranged at the lower part, close to the left side, of the H-shaped steam pipe on the front side of the high-pressure hot-stewing box; the thermocouple is fixedly arranged on the left side of the pressure sensor, and the anti-explosion valve is fixedly arranged on the right side of the pressure sensor. The device has the beneficial effects that free calcium oxide on the surface of the waste ladle brick is digested into calcium hydroxide, the digestion rate of the free calcium oxide on the surface is up to 95%, and meanwhile, the expansion rate of the crushed refractory raw material of the ladle brick is reduced to 1.5%.

The invention belongs to the technical field of building materials, and particularly discloses application of high-free-calcium and high-belite calcium sulphoaluminate clinker in preparation of a high-strength binder stabilized macadam material. According to the low-carbon waste-utilizing high-strength binder, the gypsum and the granulated blast-furnace slag powder are used as main raw materials, the specially designed clinker is doped, so that dihydrate gypsum crystals formed by externally doping the gypsum are doubly and compactly coated by AFt microcrystals and C-(A)-S-H gel, even under the condition that the mixing amount of the gypsum is relatively high, the dihydrate gypsum which is easily dissolved in water can be prevented from being dissolved in water, and the low-carbon waste-utilizing high-strength binder can be used for preparing the high-strength binder. The porosity of the high-strength binder stabilized macadam material is gradually reduced along with gradual densification of the microstructure, so that the problems of poor water resistance, great reduction of strength and poor freeze-thaw resistance of gypsum materials caused by high solubility of dihydrate gypsum are solved, and the unconfined compressive strength and durability of the high-strength binder stabilized macadam material are effectively improved.

The application belongs to the technical field of building materials, and particularly discloses a high-strength inorganic soil solidifying agent, a preparation method thereof and a high-strength soil solidifying material. The high-strength inorganic soil solidifying agent provided by the application takes high-free calcium belite sulphoaluminate clinker, gypsum and granulated blast furnace slag powder as main raw materials. The high-free calcium belite sulphoaluminate clinker provided by the application comprises the following mineral components: anhydrous calcium sulphoaluminate, free calcium sulphate, free calcium oxide, belite and iron phase. The application optimizes the mineral components of the high-free calcium belite sulphoaluminate clinker and the raw material composition of the high-strength inorganic soil solidifying agent, so that the high-strength inorganic soil solidifying agent can be used to prepare engineering materials with excellent unconfined compressive strength after solidifying soil. The application effectively solves the problems of low compressive strength and environmental unfriendliness of the existing soil solidifying material.

This invention relates to a dynamic circulating gradient adsorption process and system for gold extraction from precious metal solutions, comprising: separating the precious metal solution into high, medium, and low grades; targeted calcium ion inhibition and synergistic scale inhibition treatment, which involves adding a composite agent of polyaspartic acid, sodium citrate, and carboxymethyl chitosan to the different grades of precious metal solutions to form soluble and stable complexes of free calcium ions in each solution, preventing scaling; and cross-group dynamic carbon circulating gradient adsorption, in which different grades of precious metal solutions are transferred to corresponding adsorption tower groups at different flow rates for activated carbon adsorption, and gold-loaded carbon is circulated across groups during adsorption to improve adsorption efficiency and shorten the adsorption cycle. The system includes multiple heap leaching fields, each connected to a No. 1, No. 2, and No. 3 precious metal solution pipe. This invention significantly improves the gold recovery rate from precious metal solutions, optimizes adsorption efficiency, and provides an efficient, economical, and environmentally friendly solution for heap leaching gold extraction.

The invention discloses a preparation method of a high-absorptivity calcium supplement of vitamin D3 (VD3) and casein phosphopeptide chelated calcium (CPP-Ca), which comprises the following steps: firstly, dissolving casein phosphopeptide (CPP) in ultrapure water, adding calcium chloride, adjusting the pH value, stirring and reacting at a certain temperature to generate CPP-Ca, then precipitating by using ethanol, washing for multiple times to remove free calcium ions, and drying to obtain the high-absorptivity calcium supplement of vitamin D3 (VD3) and casein phosphopeptide chelated calcium (CPP-Ca). Centrifuging, collecting the precipitate, and freeze-drying to obtain purified CPP-Ca; the preparation method comprises the following steps: preparing CPP-Ca into a solution, adjusting the pH value, dropwise adding VD3 dissolved in ethanol into the solution, stirring and mixing at room temperature under a certain concentration to finally form the VD3 and CPP-Ca compound, and the compound prepared by the method can significantly promote calcium absorption and effectively improve the stability of VD3 and CPP.

The invention discloses a special cementing material for anticorrosive concrete and a preparation method of the special cementing material, and relates to the technical field of building materials. The cementing material is prepared from the following components in parts by mass: 1 to 4 parts of candy pomace, 15 to 25 parts of tailings, 0.5 to 1.5 parts of a water reducing agent, 8 to 18 parts of furnace slag, 25 to 35 parts of novel low-calcium clinker, 3 to 9 parts of white mud, 2 to 6 parts of micro-plastic, 3 to 8 parts of titanium gypsum and 15 to 25 parts of aluminoferrite cement clinker, the mineral composition of the novel low-calcium clinker comprises 40%-50% of dicalcium silicate, 25%-30% of calcium sulphoaluminate, 3%-8% of calcium sulphosilicate, 3%-8% of tetra calcium aluminoferrite, 8%-15% of calcium sulfate and 1%-5% of free calcium oxide. A large amount of industrial solid waste is consumed, and the method has the advantages of being low in carbon, environmentally friendly and low in cost; through the synergistic effect of micro-expansion, close packing, conductive retardation and self-sealing carbonization, efficient comprehensive protection against various corrosion factors is achieved; the self-repairing and self-compacting capabilities are realized, so that the service life of a concrete structure in a harsh environment is remarkably prolonged.

The application belongs to the technical field of building materials, and particularly discloses a semi-flexible pavement grouting material, a preparation method and a use method thereof. The semi-flexible pavement grouting material comprises the following raw material components: high-free calcium belite sulphoaluminate clinker, gypsum, granulated blast furnace slag powder and fly ash cenospheres; wherein the high-free calcium belite sulphoaluminate clinker comprises the following mineral components: anhydrous calcium sulphoaluminate, free calcium sulphate, free calcium oxide, belite and iron phase. The application uses a large amount of industrial waste such as gypsum, granulated blast furnace slag powder, fly ash cenospheres and steel slag powder as main raw materials, and adds high-free calcium belite sulphoaluminate clinker, amorphous calcium aluminate and silica fume and the like, so as to utilize the synergistic effect of the components and prepare a high-strength semi-flexible pavement grouting material. The application effectively solves the problems of low strength, poor water resistance and poor durability of the grouting material under a large amount of gypsum.

The present application relates to solid waste resource utilization and carbon capture and utilization technical field, disclose a kind of using steelmaking waste gas to reduce the carbon sequestration treatment method of free calcium oxide of steel slag, comprising: steel slag, desulfurization gypsum, papermaking caustic white mud, waste building gypsum board powder and blast furnace water quenching slag are proportioned according to mass ratio, with mine acid wastewater to regulate alkaline slurry, into steelmaking waste gas and carry out wet carbonization disposal;During carbonization disposal, caustic white mud superfine particle is used as heterogeneous nucleation seed to accelerate f-CaO carbonization, three-way cascade supply guarantees uniform formation of ettringite, and mineral powder C-S-H gel is coated paper fiber and is converted into reinforcing phase;Carbonization product is obtained by pressure filtration dewatering and low-temperature drying.The present application realizes permanent mineralization and immobilization of steelmaking waste gas and efficient and complete digestion of f-CaO of steel slag, and multiple types of industrial solid waste and mine acid wastewater are disposed simultaneously, and the product can be used for mine filling and roadbed stabilizing material.

This invention provides a method for concentrating rare earth extract using a complexation-enhanced membrane. The method includes the following steps: (1) mixing the rare earth extract and a complexing agent, and adjusting the pH to obtain a pretreated solution; (2) performing membrane filtration on the pretreated solution to obtain a concentrated solution and a permeate; (3) adjusting the pH of the concentrated solution to obtain a concentrated rare earth solution; wherein the aqueous phase obtained from the extraction in step (3) is returned to step (1) for recycling. The method for concentrating rare earth extract using a complexation-enhanced membrane addresses the flux decay during nanofiltration concentration of rare earth-containing extracts. By adding a complexing agent to the extract, rare earth ions are complexed with calcium and magnesium ions. The complexing agent increases the effective size of rare earth ions, improving the retention rate of rare earth ions, reducing the concentration of free calcium and magnesium ions, reducing fouling on the membrane surface, and improving the membrane's operating efficiency.

The invention belongs to the technical field of building materials, and particularly discloses a low-carbon waste-utilizing high-performance ceramic tile adhesive and a preparation method thereof. The low-carbon waste-utilizing high-performance ceramic tile adhesive is mainly prepared from high-free-calcium belite sulphoaluminate clinker, granulated blast-furnace slag powder, gypsum and sand. The high-free-calcium belite sulphoaluminate clinker is applied to the ceramic tile adhesive, and the raw materials of the ceramic tile adhesive are further reasonably designed, so that the 28d tensile adhesive strength of the prepared ceramic tile adhesive and the tensile adhesive strength of the prepared ceramic tile adhesive after freeze-thaw cycle, soaking, thermal aging and airing for 20 minutes are both greater than or equal to 2 MPa, and the tensile adhesive strength of the prepared ceramic tile adhesive after freeze-thaw cycle, soaking, thermal aging and airing for 20 minutes is greater than or equal to 2 MPa. And the prepared ceramic tile adhesive has excellent strength, heat resistance, water resistance and freezing resistance.

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.

This invention relates to the technical field of solid waste resource utilization, specifically to a highly active mineral admixture for multi-source solid waste, its preparation method and application, and a cementing material and its application. The invention involves calcining multi-source solid waste at above 1200℃ and then cooling it to below 150℃ within 1-2 hours to obtain a modified mineral admixture. The multi-source solid waste includes first electric furnace slag, steel slag, calcium carbide slag, and coal slag. Second electric furnace slag is mixed with a nitric acid solution, subjected to a hydrothermal reaction, and then separated into solid and liquid components. The resulting electric furnace slag leachate is mixed with a dispersant, the pH is adjusted to 11-13, and after a complexation reaction, it is dried to obtain a nanocrystalline nucleus material. The modified mineral admixture and the nanocrystalline nucleus material are mixed to obtain a highly active mineral admixture for multi-source solid waste. The highly active mineral admixture for multi-source solid waste prepared by this invention has a low free calcium oxide content, high volume stability, and high cementing activity, significantly improving the high-value-added resource utilization rate of solid wastes such as electric furnace slag and steel slag.

The invention relates to the technical field of building materials, and particularly discloses a high-free-calcium belite sulphoaluminate clinker, a preparation method, a high-strength water-resistant anti-freezing inorganic self-leveling material and application. The high free calcium belite sulphoaluminate clinker is prepared from the following mineral components in percentage by mass: 25.31 percent to 33.27 percent of anhydrous calcium sulphoaluminate, 6.55 percent to 12.26 percent of free calcium sulfate, 14.82 percent to 19.71 percent of free calcium oxide, 27.27 percent to 33.87 percent of belite and 3.04 percent to 6.08 percent of an iron phase. The synergistic effect of the high-free-calcium belite sulphoaluminate clinker and the granulated blast-furnace slag powder can improve the type, composition and microstructure of hydration products of the gypsum-based material, greatly increases the water-resistant and high-strength hydration products ettringite and C-(A)-S-H, and realizes dense coating of the ettringite and C-(A)-S-H on dihydrate gypsum at the same time; therefore, the problems of poor water resistance, poor freezing resistance and low strength of a gypsum-based self-leveling material are solved.

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 invention discloses a method for fixing carbon dioxide through smelting slag with low acid and alkali consumption, and belongs to the technical field of metallurgical solid waste resource utilization. The method is a combined process of leaching free calcium from the smelting slag by water and leaching combined calcium and magnesium from the smelting slag by an organic acid solution, and the organic acid leachate is used for capturing carbon dioxide and producing a light calcium carbonate product after being subjected to hydrolysis and impurity removal. Meanwhile, in the carbon sequestration reaction process, a non-water-soluble organic solvent is introduced to achieve extraction and enrichment of organic acid so as to design an organic acid circulation path, and water leachate is used for pH adjustment in the whole carbon sequestration reaction process. According to the method, cyclic utilization of organic acid is achieved, active alkali components in the smelting slag are fully utilized, acid and alkali consumption is reduced, meanwhile, a light calcium carbonate product with a high additional value is produced as a byproduct, and a brand new path is provided for sustainable recycling and harmless utilization of the smelting slag and carbon capture in the steel industry.

The invention discloses a building waste environment-friendly water stabilizing material and a preparation method and application thereof, and belongs to the technical field of recycled concretes.A microcapsule structure with n-docosyl serving as a core layer, silicon dioxide serving as an interlayer and chitosan serving as a shell layer is loaded on the surface of phase-change gravel, free calcium ions are directionally adsorbed, and the environment-friendly water stabilizing material is prepared; after alkali steaming, calcium hydroxide precipitates are formed and attached to the surface of a chitosan shell layer, the strength of the phase change microcapsule is improved, and then pores of the phase change broken stone are filled with calcium alginate gel, so that the phase change microcapsule can stably play a role; n-docosane can absorb a large amount of heat to be melted from a solid state to a liquid state and prevent the temperature from further rapid rising, free calcium ions distributed on the surface of the phase change gravel can provide calcium ions for gel formation in the gel formation process, the crosslinking degree with sodium alginate is further increased, the strength and the stabilizing effect of the calcium alginate gel are improved, and the stability of the calcium alginate gel is improved. The structural bearing capacity of the concrete is maintained.

The invention discloses a dry-wet cycle steel slag carbonization method and system based on dynamic moisture regulation and control, and aims to solve the problem of volume stability of steel slag caused by free calcium oxide and free magnesium oxide, and the defects of long aging period and large occupied area of the existing natural stacking and the defects of high water consumption, high energy consumption, complex equipment and poor compatibility with a storage yard in the existing carbonization technology. The method comprises the following steps: constructing a water content dynamic monitoring model based on the saturated water content of the steel slag; pre-wetting the steel slag pile to a target water content; and under normal temperature and normal pressure, placing the materials in a carbonization environment compatible with an industrial storage yard in a natural accumulation state, dynamically adjusting the water supplementing amount based on a target and the current water content, and periodically supplementing water to form a dry-wet cycle until carbonization is completed. The system comprises a moisture content monitoring module, a pretreatment module, a carbonization reaction module, an environment control module, a CO2 supply module and a moisture supplement module. The method shortens the treatment period, reduces water consumption and energy consumption, is compatible with existing facilities, adapts to the steel slag with any particle size, and provides a low-cost and easy-to-land scheme for large-scale recycling of the steel slag.

The invention relates to the field of inorganic foaming materials, and provides a quick-setting inorganic foaming material as well as a preparation method and application thereof. The quick-setting inorganic foaming material provided by the invention has remarkably improved 2h early strength, the quick-setting inorganic foaming material prepared based on the method has good construction performance, and the foam stability is good in the preparation process. The quick-setting inorganic foaming material is prepared from the following raw materials in parts by mass: 10 to 50 parts of aluminate cement, 10 to 80 parts of high-calcium minerals, 0.05 to 5 parts of gypsum, 0.01 to 2 parts of a retarder, 0.001 to 2 parts of a water reducing agent, 0.01 to 1 part of a foam stabilizer, 0 to 5 parts of a thickening agent and 0.005 to 15 parts of a foaming agent, the mass ratio of the aluminate cement to the high-calcium mineral is (2-5): 1 and 1: (2-8), and the use amount of the gypsum is 0.5-12% of the mass of the aluminate cement; the content of free calcium oxide in the high-calcium mineral is 2-40wt%; the retarder is organic acid containing carboxylate radicals.

To provide a jelly drink for rehydration for people who have difficulty chewing and swallowing, which has properties superior to those of conventional products in terms of cohesiveness, adhesion in the oral cavity, and adhesion in the pharynx. [Solution] By incorporating 1.0 to 1.5 mass% of low-methoxyl pectin relative to the total amount of the jelly beverage and 3.2 to 4.1 mass% of free calcium ions relative to the low-methoxyl pectin, a jelly beverage can be provided that has excellent properties in both adhesiveness in the oral cavity and adhesiveness in the pharynx.