69 results about "Calcium aluminosilicate" patented technology

An article comprising a silicon-containing substrate, a silicide-containing bond coat layer overlying the substrate, and typically an environmental barrier coating overlaying the bond coat layer. An article is also provided wherein the environmental barrier coating comprises: (1) an optional inner silica scale layer overlaying the bond coat layer; (2) intermediate layer overlaying the inner silica scale layer, or the bond coat layer in the absence of the inner silica scale layer, and comprising mullite, or a combination of mullite with a barium strontium aluminosilicate, a yttrium silicate, or a calcium aluminosilicate; and (3) an outer steam-resistant barrier layer overlaying the intermediate layer and consisting essentially of an alkaline earth silicate/aluminosilicate. Processes are also provided for forming the silicide-containing bond coat layer over the substrate, followed by forming the environmental barrier coating over the bond coat layer.

To provide a spraying material having an excellent quick-setting property and excellent adherability, a small alkali amount and excellent initial strength development, and a spraying method using it. The spraying material comprises a liquid quick-setting admixture containing an aluminum source, a sulfur source and a fluorine source, one or more quick-setting aids selected from the group consisting of calcium aluminate, calcium sulfoaluminate, calcium aluminosilicate, an alkali metal-containing substance, calcium hydroxide and aluminum hydroxide, and a cement concrete, and the method is to spray this spraying material.

The invention provides a method for preparing calcium aluminosilicate nanometer microcrystal glass by utilizing natrium silica calcium glass waste slag. The method comprises the following steps: 1) classifying, grinding and screening natrium silica calcium glass waste slag to prepare glass powder; 2) adding silicon dioxide, calcium oxide, aluminum oxide, boron oxide, TiO2/P2O5 composite nucleating agent and rare-earth oxide to ensure that component requirement of the calcium aluminosilicate (CAS) microcrystal glass can be fulfilled; 3) filling the uniformly mixed glass materials into a high-alumina crucible, and pouring into a die to press and mold; and 4) putting the pressed glass plate in a muffle furnace for heat treatment, cooling to room temperature with the furnace after heat treatment to obtain the CAS nanometer microcrystal glass. The method has the advantages that: (1) the mechanical performance of the microcrystal glass is greatly improved; and (2) the additive dosage is adjusted according to the component composition of the glass residues to ensure that the glass achieves the regulated formula proportion. The method is suitable for the conventional various civil natrium silica calcium glass waste slag.

The invention discloses a compound concrete expanding agent. The compound concrete expanding agent is prepared by using the following components in parts by weight: 15 to 20 parts of calcium aluminosilicate, 25 to 30 parts of calcium sulphoaluminate, 20 to 30 parts of sulfur fixation waste residue, 10 to 20 parts of red mud, 10 to 15 parts of lithium slag, 4 to 8 parts of modified calcium oxide, 3 to 6 parts of magnesium oxide, 5 to 8 parts of methyl sodium silicate, 0.1 to 0.3 part of azodicarbonamide, 0.4 to 0.7 part of sodium tripolyphosphate, 2 to 4 parts of lauryl sodium sulfate, 0.3 to 0.6 part of ethylene-acrylic acid copolymer, 0.7 to 0.9 part of polycarboxylate superplasticizer and 0.5 to 0.7 part of nano calcium carbonate. The compound concrete expanding agent has the advantages of high strength, good compensation capability, calcium oxide reaction regulation and the like, and is a concrete additive which has a great development prospect.

A cement mortar composition for grouts which retains satisfactory flowability, is free from bleeding and material separation, has an anti-cracking ability due to high strength, high durability, and reduction in dry shrinkage, and is for use in applications such as foundations for machines; and a grout mortar obtained from the composition. The cement mortar composition for grouts comprises a binder, a setting retarder, a water-reducing agent, and a fine aggregate. It is characterized in that the binder comprises a quick hardening material comprising a cement, calcium aluminosilicate glass, and plaster and a fine pozzolan powder, the water-reducing agent comprises at least a polycarboxylate-type water-reducing agent, and the fine aggregate is a heavy aggregate having a density of 3.0 g/cm<3> or higher. The grout mortar is obtained by kneading the cement mortar composition together with water.

The invention, provides a curable, formaldehyde free coating composition comprising a composition comprising a polyacid copolymer crosslinked with a hydroxyl group-containing compound and calcium aluminosilicate powder, panels coated with the coating composition, and a method of coating a panel with the coating composition.

The invention discloses a hydrated calcium aluminosilicate nano crystalline nucleus early strength agent and a preparation method thereof. The preparation method comprises the following steps: dropwise adding an aqueous solution of a calcium source, an aqueous solution of a silicon source and an aqueous solution of an aluminum source into a polycarboxylate water reducer dispersion liquid, adjusting the pH value to 10.0-13.5, and carrying out reactions under stirring to obtain the hydrated calcium aluminosilicate nano crystalline nucleus early strength agent. The hydrated calcium aluminosilicate nano crystalline nucleus early strength agent is small in particle size and good in dispersion stability, can greatly improve early hydration and mechanical behaviors of a cement-based material, andhas a good application prospect. The preparation method of the hydrated calcium aluminosilicate nano crystalline nucleus early strength agent comprises the following steps: mixing an aqueous solutionof a calcium source, an aqueous solution of a silicon source and an aqueous solution of an aluminum source with a polycarboxylate water reducer according to a specific molar ratio under specific temperature and pH conditions and carrying out reactions under stirring. The preparation process is simple, subsequent processes such as washing, drying and ultrasonic dispersion are not needed, and the preparation method is suitable for large-scale production.

he invention discloses an uncemented geopolymer grouting material and a preparation method thereof. Gravel is used as a supporting material to improve the overall strength of the material, blast furnace slag powder, fly ash and silica fume are added, and the silica ash mainly composed of SiO2 can optimize the pore structure and reduce the porosity of the system; a water glass solution and NaOH are used to dissolve and rejoin active silicon, aluminum and calcium substances in the fly ash and slag powder in order to form hydration products which are C-S-H hydrated calcium silicate and C-S-A-Hhydrated calcium aluminosilicate, and a solution composed of the water glass solution and NaOH is used to firstly react the fly ash with alumina in the slag powder in order to ensure the increase of the reinforcing material after the calcium oxide removal, so the utilization rates of the blast furnace slag powder and the fly ash are effectively improved, and the working performances of the grouting material are improved. The grouting material prepared in the invention has the advantages of good fluidity, low bleeding ratio, high concretion rate, effectiveness in utilization of the industrial wastes which are slag powder and fly ash, and realization of the purpose of changing industrial wastes into valuables.

[PROBLEMS] To provide an oxygen storage substance which has higher oxygen storage capacity than conventional substances and is inexpensive. [MEANS FOR SOLVING PROBLEMS] The oxygen storage substance is a calcium aluminosilicate (mayenite), i.e., a substance of a crystal structure which is synthesized by hydrothermally treating a mixture of calcium oxide, alumina (sol), and amorphous silica, has a three-dimensional network composed of AlO₄ tetrahedrons and (Al,Si)O₄ tetrahedrons in which part of the aluminum atoms have been replaced with silicon atoms, with vertex oxygen atoms being shared, and has oxide ions (O₂⁻) occluded in microspaces in the structure. Part of the calcium atoms may be replaced with atoms of a transition metal, e.g., copper.

The invention relates to a calcium treatment method implemented under a special steelmaking process. The calcium treatment method is characterized by comprising the following steps: carrying out desulfurization in a molten iron pretreatment process, namely, blowing CaO+Mg powder to desulfurize the molten iron until the sulfur content is 0.0018 to 0.0022 percent, and slagging off after the desulfurization; controlling the oxygen content at an end point of a converter within 650ppm in an converter process; ensuring the vacuum degree to be less than or equal to 300Pa in the RH (Ruhrstahl Heraeus) process, and maintaining the vacuum degree for 10 to 30 minutes; and secondarily returning the molten iron subjected to RH treatment to an LF (Ladle Furnace), adjusting the temperature, slagging after the RH treatment is completed, then conducting the calcium treatment, ensuring the feeding speed of a calcium line to be 180 to 200m/min, ensuring the feeding quantity of steel to be 1.4m/t, and controlling the bottom-blowing flow rate at 50 to 100 NL/min. By adopting the method, the impurities can be gradually converted from primary silicon manganate to calcium aluminosilicate, so that the quantity of the impurities per unit area of a steel plate can be remarkably reduced and is reduced from 87 to 100/mm<2> to 12 to 25/mm<2>. After the RH vacuum and calcium treatment, the type of the impurities is changed, and a product is deviated to the side of CaO-CaS; the size of the impurities in a tundish is relatively small, the impurities with the size being less than 10 micrometers account for 99.61 percent, and the impurity with the size being more than 30 micrometers is not found. By adopting the method, the molten steel purity and the steel plate flaw detection qualification rate can be improved, the calcium yield is stabilized at 20 percent or more, and the economic benefit is obvious.

Disclosed is a cement mortar which exhibits good workability free from recesses and projections, while having excellent storage stability. Specifically disclosed are: a cement admixture for repair, which contains calcium aluminosilicate glass, gypsum, aluminum sulfate hydrate and a setting regulating agent; the cement admixture for repair, which additionally contains a water reducing agent; a cement composition for repair, which contains the cement admixture for repair and cement; a cement mortar material for repair, which contains the cement composition for repair and fine aggregate; the cement mortar material for repair, wherein the maximum particle diameter of the fine aggregate is 0.3 mm or less; a cement mortar for repair, which contains the cement mortar material for repair and water; and a construction method wherein a cement mortar for repair, which contains cement, calcium aluminosilicate glass, gypsum, aluminum sulfate hydrate, a setting regulating agent, fine aggregate and water, is applied to a floor surface.

A nano waterproof cement and its production are disclosed. The water-proof cement consists of nanometer SiO-xA380 2-3%, Al(OH)3 1-2%, CaO 5-6%, S(COOH)3F3 5-6%, polycrystalline Si granule 0.05-0.1%, Al powder 0.05-0.1%, pure Ca granule 0.1-0..5%, Na2S2O8 0.6-1.7% and cement 80-85%. The process is carried out by using SiO-xA380, Al(OH)3, CaO and S(COOH)3F3 to prepare active calcium aluminosilicate base metal, using polycrystalline Si, Al powder and pure Ca to prepare calcium aluminosilicate reductive powder and oxidation reacting from Na2S2O8 to obtain nanometer water-proof cement. It can be used for waterproof coating, concrete and water reducer.

The invention belongs to the technical field of water environment treatment and relates to a sewage purifying agent. An urban sewage rapid purifying agent is composed of 0.1-25 parts of boron-iron-aluminum polysilicate, 2-10 parts of calcium peroxide, 1-10 parts of magnesium peroxide, 1-15 parts of aluminum ferric polysilicate, 1-10 parts of polyacrylamide, 1-10 parts of ployferric sulfate, 1-15 parts of calcium nitrate, 1-3 parts of sodium silicate and 1-2 parts of polyferric chloride. The agent provided by the invention has the advantages that pH after hydration can be controlled to be 7.5-9.5, and tight composite mineralized sediments which are provided with sustained release oxygen and are mainly calcium silicate, magnesium silicate, aluminum silicate, calcium aluminosilicate and aluminosilicic acid can be gradually formed. Therefore, suspending particular matters and various kinds of harmful impurities in sewage can be rapidly settled, sustained release and oxygenation functions on mud at the water bottom can be realized, bottom mud with a tight structure also can be formed after settlement, and the sewage purifying agent can be applied to treatment of printing and dyeing wastewater, urban polluted landscape water and urban inland river black and odorous water.

The invention discloses a subgrade reinforcing quick-setting grouting material and a preparation method thereof. The preparation method comprises the following steps: mixing blast furnace slag powderwith fly ash according to a specific mass fraction, enabling the mixed surface of the blast furnace slag powder and the fly ash to be fully contacted, utilizing silica and alumina contained in the flyash and calcium oxide and silica contained in the slag powder, then mixing water, a water glass solution, a NaOH solid and a water reducer to form a reflection solution, dissolving active silicon, aluminum and calcium substances in the fly ash and the slag powder by using the water glass solution and NaOH and then performing reagglomeration to form C-S-H hydrated calcium silicate and C-S-A-H hydrated calcium aluminosilicate hydration products. According to the preparation method, alumina in the fly ash and the slag powder is firstly reacted by using a solution comprising the water glass solution and NaOH, so that excessively fast condensation caused by excessive fly ash can be prevented, the post removal of calcium oxide can be ensured to reflect the growth of reinforcing materials, the utilization rate of the blast furnace slag powder and the fly ash can be effectively improved, and the working performance of the grouting material can be improved at the same time.

The invention discloses a process for producing high-alumina cement by using aluminum ash and fly ash generated after waste incineration. The process comprises the following steps of: mixing and homogenizing the aluminum ash and the fly ash generated after waste incineration according to the weight ratio of (6-7): (3-4); heating the material to 1400-1700 DEG C by a high-temperature smelting furnace; heating and preserving heat for 2-3 hours; and performing cooling, and then performing crushing and grinding to obtain the high-alumina cement. According to the process, the aluminum ash and the fly ash obtained after waste incineration are mixed, homogenized and fused at high temperature, the high-alumina cement with calcium aluminate and calcium aluminosilicate as main components is prepared, and the high-alumina cement can reach the CA-60 cement grade. After a large amount of heavy metal salts in the fly ash are molten, the leaching rate is very low after the heavy metal salts are stably solidified, dioxin can be degraded and harmlessly treated at about 1400 DEG C; and after treatment, toxic leaching meets the environmental protection requirement and national standard. After chlorate in the aluminum ash is volatilized at the high temperature of 1400-1700 DEG C, calcium chloride is collected through a flue gas pipeline rapid cooling dust collection bag, and a harmless calcium chloride byproduct is formed.

The invention discloses a coal gangue powder-based grouting material for pavement voids and a preparation method of the coal gangue powder-based grouting material. Gravel is used as a supporting material to improve the overall strength of the grouting material, coal gangue powder, slag powder and coal ash are added, and an alkaline activator is used for activation of the above materials so as to prepare a material with gelling capacity; the gravel is used as a filling material to support a void area of a pavement, and the coal gangue powder and other powder can permeate into fine pores of thegravel, so the grouting material and a pavement structure are bonded into a whole through the permeation of fine materials; and a solution prepared from a sodium silicate solution and a NaOH solid isadopted, active silicon, aluminum and calcium substances in the coal gangue powder, the slag powder and the coal ash are dissolved by using the sodium silicate solution and KOH and then re-aggregatedto form a solution composed of C-S-H hydrated calcium silicate, a C-S-A-H hydrated calcium aluminosilicate hydration product, the sodium silicate solution and KOH, and the formed solution enables thecoal gangue powder and aluminum oxide in the slag powder to react firstly, can prevent too fast coagulation caused by too much coal ash, and the working performance of the grouting material is improved.

A hydratable cement composition which will bond to both asphalt and cementitious substrates is supplied for the repair of various surfaces. The composition comprises of a combination of Portland cement, calcium sulfoaluminate cement or calcium aluminosilicate, and an alkali metal salt activated pozzolonic powder, wherein the Portland cement content of the hydratable portion of the composition is greater than 20%. The composition is free from latex bonding agents and calcium aluminate. The composition is mixed with water to form a typical cement, mortar, or concrete consistency, placed and allowed to cure. The result is a self-adhering patch to damaged surfaces. The hydratable cement composition may also be used to fabricate items of original construction by casting into molds or forms.

The invention discloses polysaccharide modified hydrated calcium aluminosilicate nano crystalline nucleus suspension, which comprises hydrated calcium aluminosilicate nano crystalline nucleus suspension and dispersion stabilizing liquid, the hydrated calcium aluminosilicate nano crystalline nucleus suspension is prepared from a reaction stock solution and a reaction base solution, and the mass ratio of the reaction stock solution to the reaction base solution is 1.57-5.24: 1; wherein the reaction stock solution comprises soluble calcium salt, soluble silicate and soluble aluminum salt, and themolar ratio of the soluble calcium salt to the soluble silicate to the soluble aluminum salt is (0.2-1.8): 1: (0.01-0.5); the reaction base solution comprises a polycarboxylate superplasticizer; thedispersion stabilizing liquid comprises soluble polysaccharide; the mass ratio of the hydrated calcium aluminosilicate nano crystalline nucleus suspension to the soluble polysaccharide is (100-10000):1. The invention solves the problem of long-acting dispersion stability of the hydrated calcium silicate nano crystalline nucleus suspension in the prior art. The invention also provides a preparation method of the polysaccharide modified hydrated calcium aluminosilicate nano crystalline nucleus suspension.

The invention discloses a preparation method of calcium aluminosilicate blue phosphor powder for a near-ultraviolet excited white LED (Light Emitting Diode) and belongs to the preparation technology of rare earth phosphor powder. The chemical formula of the calcium aluminosilicate blue phosphor powder disclosed by the invention is as follows: Ca(1-x)Al2Si2O8:xEU2+, wherein x is greater than 0 and less than or equal to 0.12. The preparation method disclosed by the invention comprises the following specific steps of: respectively weighing required calcium salt, aluminium salt, silicic acid and europium nitrate according to a chemical general formula of Ca1-xAl2Si2O8; then respectively weighting a surfactant and a fluxing agent accounting for 0.1-1.5wt% of the total mass of the above medicines; weighing a sufficient quantity of a precipitant to prepare as a solution; preparing the calcium salt, the aluminium salt, nitrate and the surfactant as a solution, uniformly mixing and slowly dropping into the precipitant solution, simultaneously and continuously stirring till a precipitin reaction is completely processed; washing, filtering and drying precipitate to acquire a precursor; uniformly mixing the precursor, the fluxing agent and the silicic acid, and calcining for 2-4 hours at temperature of 1150-1400 DEG C to acquire a target product. The phosphor powder prepared by the method disclosed by the invention is wide excitation wavelength, high in luminous intensity and good in crystallinity, and is suitably used as the blue phosphor powder for the white LED.

The invention discloses high-strength glass-ceramic and a preparation method thereof and relates to the technical field of glass products. The glass-ceramic is prepared from crushed glass, modified quartz powder, tremolite, mordenite, nano-silica, brucite fibers, sodium borosilicate, sodium metasilicate pentahydrate, calcium aluminosilicate, boron oxide, ammonium nitrate, antimony dioxide and calcium fluoride. The preparation method comprises raw material melting, stirring melting, standing clarification, pressing molding and uniform annealing. The high-strength glass-ceramic has low surface porosity, high mechanical strength, good toughness, a long service life and a wide application range.