76 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 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.

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 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 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 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.

This invention discloses a lattice distortion-induced M1-C3S ultra-high early strength clinker and its preparation method, belonging to the field of cement material technology. The clinker comprises the following mineral components: C3S, C2S, C3A, C4AF, and f-CaO, with the remainder being mixed mineral components. The clinker is prepared from calcareous raw materials, silica-alumina raw materials, and a mineralizing agent, wherein the mineralizing agent is at least one selected from calcium slag, yellow phosphorus slag, phosphogypsum, bauxite, and fluorite waste. This invention, through synergistic regulation of the mineralizing agent composition and cooling regime, based on the principle of ion-doped lattice distortion, introduces a composite mineralizing agent containing trace elements P, Ti, and F into the raw meal. Combined with a water-cooling rapid cooling process, the high-temperature lattice distortion state is frozen to room temperature, promoting the large-scale generation of highly active M1-C3S. The clinker prepared by this invention has a high total C3S content, a high proportion of M1-type C3S, and a low free calcium content, achieving a synergistic unity of early strength and high later strength.

The invention relates to a lightweight concrete material, and provides an early-strength quick-setting lightweight concrete material and a preparation method and application thereof, and the early-strength quick-setting lightweight concrete material provided by the invention can give consideration to good 2h early strength and good constructability in the preparation process. The early-strength quick-setting lightweight concrete material is prepared from the following raw materials in parts by mass: 10 to 75 parts of aluminate cement, 15 to 80 parts of high-calcium minerals, 0.05 to 7.5 parts of gypsum, 0.01 to 2 parts of a retarder, 0.001 to 2 parts of a water reducing agent, 0.01 to 0.5 part of a thickening agent, 0.01 to 1 part of a water-retaining agent and 0.1 to 5 parts of polystyrene foam aggregate, wherein the mass ratio of the aluminate cement to the high-calcium mineral is 5: (1-40), 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.

The invention belongs to the technical field of building materials, and particularly discloses high-strength waterproof anti-freezing putty and a preparation method thereof. The high-strength waterproof anti-freezing putty provided by the invention is prepared from the following components in a specific weight ratio: high-free-calcium belite sulphoaluminate clinker, granulated blast furnace slag powder, gypsum, filler, latex powder and a water-retaining agent. Through the raw material design of the high-strength water-resistant anti-freezing putty, 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, and the water-resistant and high-strength hydration products ettringite and C-(A)-S-H gel are increased; meanwhile, the dihydrate gypsum is compactly coated by the two materials; and a dense microstructure is constructed by the putty powder and other components in the formula, such as latex powder and a water-retaining agent, so that the high strength, water resistance and frost resistance of the putty are improved.

The present application relates to the field of waste liquid treatment, and discloses a bone-derived biological calcium as well as a preparation method and application thereof.The bone-derived biological calcium contains a calcium source and water-soluble organic matter; wherein, the mass ratio of the calcium source and the water-soluble organic matter in the bone-derived biological calcium is 7-26:1-8 in terms of calcium element; wherein, the calcium source exists in the form of free calcium and chelated peptide calcium.The bone-derived biological calcium is prepared by using bone gelatin production waste liquid, which is a high-salt, high-chlorine and high-organic waste liquid discharged in the bone gelatin production process, as raw material, through coagulation and sedimentation, protein degradation, membrane separation to obtain a clear liquid, and then through evaporation and other processes to prepare liquid or solid bone-derived biological calcium.The method uses bone gelatin production waste liquid, which is a high-salt, high-chlorine and high-organic waste liquid discharged in the bone gelatin production process, as raw material, solves the problem of water and soil pollution caused by high-salt waste liquid, and solves the technical bottleneck of comprehensive utilization of gelatin industry waste liquid.

The application relates to the technical field of building materials, and particularly discloses a high-free-calcium belite sulphoaluminate clinker, a preparation method thereof, a high-strength water-resistant and anti-freezing inorganic self-leveling material and application. The high-free-calcium belite sulphoaluminate clinker comprises the following mineral components in percentage by mass: anhydrous calcium sulphoaluminate 25.31%-33.27%, free calcium sulfate 6.55%-12.26%, free calcium oxide 14.82%-19.71%, belite 27.27%-33.87% and iron phase 3.04%-6.08%. The high-free-calcium belite sulphoaluminate clinker and granulated blast furnace slag powder can improve the types, composition and microstructure of the hydration products of the gypsum-based material, and can greatly increase the water-resistant and high-strength hydration products of ettringite and C-(A)-S-H, and meanwhile, the two can realize dense coating of dihydrate gypsum, so that the problems of poor water resistance, poor frost resistance and low strength of the gypsum-based self-leveling material are solved.

This invention discloses a low-carbon and environmentally friendly method for reducing the free calcium oxide content in freshly produced steel slag, comprising the following steps: 1) crushing the freshly produced steel slag in a jaw crusher to obtain steel slag with various particle size ranges; 2) mixing the steel slag with various particle size ranges according to a set method, and then transporting them in batches to sealed compartments in the plant for stacking; 3) allowing the slag to naturally age for a set time in the sealed compartments to obtain steel slag with a free calcium oxide content meeting the set requirements. This invention utilizes water vapor and carbon dioxide in the air to chemically modify the steel slag, reducing its free calcium oxide content and improving its chemical stability.

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 full-automatic clinker free calcium detection equipment, and relates to the technical field of detection equipment, the full-automatic clinker free calcium detection equipment comprises a detection table, a jacking mechanism, a weighing mechanism, a titration mechanism, a cleaning mechanism and a storage mechanism, the side surface of the detection table is provided with a feed port for conveying clinker powder; the jacking mechanism is mounted on the detection table and is used for jacking a material cup which is conveyed from the feeding hole and is filled with clinker powder to the table surface of the detection table; according to the equipment disclosed by the invention, the jacking mechanism, the weighing mechanism, the titration mechanism, the cleaning mechanism and the storage mechanism are integrated on one detection table, so that the structure is compact; the whole process from clinker powder conveying, weighing, titration experiment to beaker cleaning and drying is automatic, the design enables the detection process to be more efficient, the detection period is shortened, and the real-time and efficient quality control requirements of modern cement production are met.

The application discloses a carbonation method of free calcium oxide in steel slag and belongs to the field of iron and steel metallurgy. The steel slag is put into a reaction kettle, flue gas is introduced into the reaction kettle, the temperature of the flue gas and the CO2 concentration in the flue gas are controlled, proper amount of water vapor is introduced during the reaction, and proper amount of dust removal ash is added, so that the carbonation reaction is promoted to proceed in the positive reaction direction, and the free calcium oxide is quickly converted into stable CaCO3. The application can promote the carbonation reaction of the free calcium oxide (f-CaO) in the steel slag, quickly convert the free calcium oxide into stable CaCO3, improve the stability of the steel slag, expand the recycling range of the steel slag, and turn waste into treasure.

The invention discloses a clinker free calcium prediction method based on causal alignment, and relates to the technical field of intelligent control of a cement production process. The method comprises the following steps: firstly, carrying out multi-source data acquisition and fusion to obtain process variables and test data; the method comprises the following core steps of: performing refined time alignment on variables based on process time delay grouping so as to reflect differential delay of different working sections on clinker quality; online causal filtering is carried out by adopting a unilateral Gaussian kernel, and future information leakage is strictly avoided while noise is eliminated; carrying out causal feature extraction and screening by using conditional mutual information and a minimum redundancy maximum correlation algorithm under the constraint of a structural causal model and time sequence precedence; and finally, generating an aggregation statistical characteristic sample in the causal time window for constructing a prediction model and outputting a real-time prediction value of free calcium. According to the method, the problems of low prediction precision, poor interpretability and difficulty in cross-line migration caused by rough time delay processing, data noise and pseudo correlation in the prior art are effectively solved.

The application discloses a non-amino reducing agent, a preparation method and application in SNCR deep denitration, the reducing agent includes mixed solution and free calcium oxide, and the mixed solution includes biomass cracking solution 4 parts, cyanuric acid 0.5-1 part, desalted water 0.5-1 part and ethylene glycol 0.5-1 part by weight; the mass ratio of the mixed solution to the free calcium oxide is 6:(0.5-1); the non-amino reducing agent is applied to industrial denitration, can make the concentration of NO x concentration is less than 30mg / m 3 The following, the denitration efficiency reaches more than 92%; ammonia escape secondary pollution and ammonium salt fouling and other safety risks can also be avoided, the operation reliability and safety of the denitration system are improved, and the cost is low, and the benefit is good.