275 results about "Strontium carbonate" patented technology

The invention belongs to the technical field of enamel glaze preparation, and particularly relates to a high-temperature-resistant compact enamel glaze preparation method, which comprises: 1, enamel frit preparation: mixing 45-65% by mass of silicon dioxide, 10-15% by mass of anhydrous borax, 5-10% by mass of sodium carbonate, 2-6% by mass of lithium carbonate, 2-6% by mass of calcium carbonate, 2-6% by mass of strontium carbonate, and 3-6% by mass of ice crystal to form a batch, melting at 1300 DEG C for 2-3 hours, carrying out water quenching to prepare an enamel material, drying, and sieving with a 200-mesh sieve to obtain enamel frit powder; step 2, preparing enamel glaze slip, namely mixing and ball-milling 40-55% of enamel frit powder, 15-30% of 316 # stainless steel powder, 5.5-10% of clay suspending agent and 25-50% of water in percentage by mass to obtain the enamel glaze slip; and step 3, enamel coating and firing. The enamel coating has excellent high temperature resistance and corrosion resistance and long service life, and the preparation process is simple in requirement, simple and convenient to operate and suitable for industrial production.

The invention relates to the technical field of biological induction of calcium carbonate deposition, in particular to self-repairing concrete for biological induction of calcium carbonate deposition and a preparation method thereof. The cement comprises the following components in parts by weight: 320-380 parts of Portland cement and the like. The biomineralization composite inducer contains a genetically engineered bacterium solution, a urea-calcium chloride solution and a nano strontium carbonate seed crystal; the nano silicon dioxide-graphene composite powder is prepared by chemical vapor deposition; the wall material of the double-response microcapsule contains a temperature-sensitive polymer, and the core material contains a plurality of components; nanocellulose whiskers are also added; self-repairing is achieved through cooperation of multiple components, and all the components are specially treated or prepared. The self-repairing concrete is high in self-repairing efficiency, and wide cracks can be repaired; the mechanical property is excellent, and the compression strength and the breaking strength are remarkably improved; working performance is good, and construction is convenient; durability is good, and erosion and permeability are resisted; environmental protection and economy are considered, and the application prospect is wide.

The invention relates to the technical field of glazes, and particularly discloses an antifouling glaze with a snow velvet effect and a preparation method thereof. The glaze comprises the following raw materials in parts by weight: 35-45 parts of quartz stone, 4-6 parts of zinc oxide, 7-8 parts of strontium carbonate, 4-5 parts of barium carbonate, 7-9 parts of calcite, 8-10 parts of talc, 5-8 parts of kaolin, 0.01-0.1 part of titanium dioxide and 1-5 parts of a microcapsule repairing agent. According to the glaze, a large number of fine willemite crystals can be separated out, so that a flickering crystal flower effect is generated, and a glass phase between the crystals is very compact, so that the unification of a visual effect and an antifouling function is realized. Even if the surface is scrubbed to generate scratches, the surface can be recovered through self-repairing, so that the antifouling effect is further improved.

The invention provides a self-repairing hydrated salt phase change microcapsule as well as a preparation method and application thereof, and belongs to the field of phase change materials. The preparation method comprises the following steps: preparing a hydrated salt phase change material and sorbitol into eutectic melt by adopting a melting method; strontium carbonate, sorbitol grafted nano titanium dioxide, SiO2-coated silicone rubber microspheres, hollow Al2O3 microspheres, tannic acid microcapsules, alpha-zirconium phosphate, melamine polyphosphate, diethyl aluminum hypophosphite, carboxylated multi-walled carbon nanotubes, polydopamine modified boron nitride nanosheets and hydrophilic fumed silica are added into the eutectic melt, and blending is performed to obtain a core material; The preparation method comprises the following steps: adding strontium carbonate, sorbitol grafted nano titanium dioxide, SiO2-coated silicone rubber microspheres, hollow Al2O3 microspheres, tannic acid microcapsules, alpha-zirconium phosphate, melamine polyphosphate, diethyl aluminum hypophosphite, carboxylated multi-walled carbon nanotubes, polydopamine modified boron nitride nanosheets and hydrophilic fumed silica into the eutectic melt; bio-based polyurethane-polyurea is used as a shell material, the core material is coated in the shell to prepare the microcapsule, and the temperature of the coating operation is not higher than the phase change temperature of the hydrated salt phase change material; the surface is coated with a super-hydrophobic coating. According to the invention, a solid filler system is constructed, and a low-temperature preparation process is combined, so that the phase-change microcapsule with high performance, high reliability and high safety is developed.

The invention belongs to the technical field of electro-catalysis, and particularly relates to iridium-cluster-loaded strontium titanate as well as a preparation method and application thereof. The strontium titanate loaded with the iridium cluster provided by the invention comprises strontium titanate and the iridium cluster loaded on the surface of the strontium titanate, the iridium cluster comprises the following components: an iridium elementary substance and an iridium oxide wrapping the surface of the iridium elementary substance; the chemical composition of the strontium titanate is SrTiO3-x, and x is more than 0 and less than 0.5; the chemical composition of the iridium oxide is IrO2-y, and y is more than 0 and less than 2; the strontium carbonate is of a cubic octahedral structure. The iridium-cluster-loaded strontium titanate not only has excellent electrocatalytic activity, but also has long-term stability, and can be efficiently and stably operated for a long time under the working condition of PEMWE.

The invention belongs to the technical field of ceramics, and particularly relates to a three-dimensional effect glaze, a three-dimensional effect ceramic tile and a preparation method thereof. The three-dimensional effect glaze is composed of honeycomb ground glaze and honeycomb effect glaze; the honeycomb ground glaze comprises the following mineral components in percentage by mass: 20%-30% of quartz, 5%-10% of kaolin, 12%-18% of albite, 7%-15% of calcite, 2%-7% of wollastonite, 12%-17% of calcined talc, 15%-25% of calcined zinc oxide, 2%-6% of titanium dioxide, 2%-4% of glass powder, 1%-3% of strontium carbonate and 1%-5% of dolomite. The glaze with the honeycomb effect comprises the following mineral components in percentage by mass: 5%-15% of quartz, 5%-10% of kaolin, 40%-55% of albite, 2%-6% of barium ice feldspar, 2%-10% of calcite, 7%-15% of calcined talc, 1%-4% of calcined zinc oxide, 7%-15% of red mud and 3%-5% of coal gangue. The novel effect glaze is developed, the glaze surface is flat and smooth, meanwhile, the ground glaze is pushed to the surface through the gas phase disturbance effect, and the effect glaze sinks and wraps the ground glaze in a three-dimensional honeycomb shape.

The invention belongs to the technical field of magnetic material preparation, and particularly relates to permanent magnetic ferrite and a preparation method and application thereof. The preparation method of the permanent magnetic ferrite provided by the invention comprises the following steps: (1) mixing iron scale subjected to heat treatment with strontium carbonate, and carrying out dry vibration ball milling and pre-sintering to obtain pre-sintered powder; wherein the temperature of the heat treatment is 700 to 900 DEG C; and (2) mixing the pre-sintered powder with a first additive, and sintering. The residual magnetism (Br), the magnetic induction coercive force (Hcb), the intrinsic coercive force (Hcj) and the maximum magnetic energy product ((BH) max) of the prepared permanent magnetic ferrite are relatively high.

The invention discloses a titanium-based enamel coating suitable for low-temperature firing and a preparation method of the titanium-based enamel coating, and belongs to the field of enamel material preparation and application. Wherein TA1 is adopted as the titanium alloy base material; the enamel frit provided by the invention is prepared by mixing and melting the following components in percentage by mass: 28 to 47.7 percent of quartz, 21.2 to 46.4 percent of boric acid, 10.5 to 13.6 percent of sodium carbonate, 5.4 to 6.9 percent of lithium carbonate, 3.8 to 4.4 percent of zinc oxide, 1.8 to 3.0 percent of barium carbonate, 2.6 to 5.5 percent of strontium carbonate and 0.5 to 1.0 percent of zircon quartz powder. The preparation method of the coating comprises the following steps: carrying out ball milling on the enamel frit, a small amount of clay, nitrite and water, spraying on the surface of a TA1 titanium substrate with a clean surface, drying, and sintering in a high-temperature furnace at 740-840 DEG C for 10 minutes; according to the titanium-based enamel coating obtained through the method, the firing temperature ranges from 740 DEG C to 840 DEG C, the coating is firmly combined with a base material, the temperature sudden change resistance is excellent, and the titanium-based enamel coating can bear the temperature difference impact of 700 DEG C.

The invention relates to a BME high-capacity multilayer ceramic dielectric capacitor, rare earth-free dielectric ceramic powder for the BME high-capacity multilayer ceramic dielectric capacitor and a preparation method of the rare earth-free dielectric ceramic powder, and the dielectric ceramic powder is composed of barium titanate, magnesium oxide or carbonate, manganese oxide or carbonate, calcium carbonate or oxalate, strontium carbonate or oxalate, vanadium pentoxide, silicon dioxide and zirconium oxide in proportion. The limited dielectric ceramic powder does not contain rare earth components, and the cost of raw materials is low; in the prior art, rare earth is used as an important auxiliary component for doping in most of high-K-value formulas, so that on one hand, capturing of oxygen vacancies is facilitated, and the service life of the MLCC is prolonged; on the other hand, the rare earth elements are beneficial to adjusting the capacitance-temperature change curve of the MLCC; according to the invention, calcium element, manganese element and strontium element in a proper proportion are used as auxiliary components to be combined to capture movable oxygen vacancies, so that the insulation resistance and the service life of the MLCC prepared from the dielectric ceramic powder are improved; and meanwhile, the vanadium element is used for adjusting the capacitance-temperature change curve of the MLCC, so that the MLCC meets the X5R characteristic.

The invention provides near-infrared adjustable double-perovskite type mechanoluminescence fluorescent powder as well as a preparation method and application of the near-infrared adjustable double-perovskite type mechanoluminescence fluorescent powder. The expression general formula of the double perovskite type mechanoluminescence fluorescent powder is Sr2M1-xSbO6: xCr < 3 + >, wherein M is Al, Ga, Sc, In or Y; x is equal to 1%-7%. The preparation process of the fluorescent powder comprises the following steps: a, weighing strontium carbonate, an oxide of M, antimony pentoxide and chromium sesquioxide according to the element proportion in the chemical general formula Sr2M1-xSbO6: xCr < 3 + >; b, mixing the weighed raw materials, and uniformly grinding to obtain a mixture; and c, carrying out high-temperature calcination on the obtained mixture to obtain the near-infrared adjustable double perovskite type mechanoluminescence fluorescent powder. By regulating and controlling the components of the substrate, the emission main peak can be adjusted from 780nm to 946nm. The fluorescent powder provided by the invention can show a self-recovery near-infrared stress luminescence characteristic without pre-irradiation under continuous stress stimulation, is simple to prepare and convenient for industrial batch production, and has a wide application prospect.

The invention discloses a sintering aid coated lead barium titanate-based thermal sensitive ceramic and a preparation method thereof, and relates to the technical field of material science, the raw materials of the core layer comprise barium carbonate, lead tetraoxide, calcium carbonate, strontium carbonate, zirconium oxide, tin oxide, titanium dioxide, manganese oxide and niobium pentoxide; the raw materials of the shell layer comprise silica sol, an aluminum compound, a calcium compound, a sodium compound, a potassium compound, a magnesium compound and boric acid; the preparation method comprises the following steps: mixing the raw materials of the core layer, calcining at 950-1050 DEG C, adding a deionized water solution of the raw materials of the shell layer, mixing, calcining at 1000-1100 DEG C, adding a polyvinyl alcohol water solution, granulating, forming, degumming and sintering to obtain the sintering aid coated lead barium titanate based thermal sensitive ceramic. According to the invention, the sintering aid is used for coating the lead barium titanate-based thermal sensitive ceramic, so that the densification of the ceramic is promoted while grains are refined, and the ceramic has high voltage resistance and excellent PTC (Positive Temperature Coefficient) effect.

The invention relates to the technical field of insect situation forecasting lamps, in particular to a manufacturing method for improving the strength of a permanent magnetic ferrite wet-pressing magnetic shoe. Comprising the following production steps: 1, weighing iron oxide red with proper granularity, strontium carbonate with proper granularity and an additive, uniformly mixing, and pre-sintering to obtain pre-sintered material magnetic powder; 2, putting the pre-sintered material magnetic powder and a sintering aid into a ball mill, and performing micro-crushing by taking water as a medium; 3, the water content of the micro-crushed slurry is adjusted, the slurry is placed in a magnetic field to be formed, and a magnetic shoe pressed blank is obtained; and 4, sintering the magnetic tile pressed blank in a kiln to obtain a sintered magnetic tile semi-finished product. And 5, grinding the sintered magnetic shoe semi-finished product. According to the method, iron oxide red with the particle size larger than or equal to 1.5 micrometers is adopted for producing the ferrite pre-sintering material, meanwhile, the fine grinding particle size of slurry before wet pressing forming is controlled to be larger than 0.8 micrometer, and then the mechanical strength of the wet pressing magnetic shoe obtained through forming and sintering is obviously improved.

The invention relates to a base metal high-voltage multilayer ceramic dielectric capacitor and a preparation method, the base metal high-voltage multilayer ceramic dielectric capacitor is formed by stacking and firing dielectric layers, and each dielectric layer comprises a dielectric layer and an electrode printed on the dielectric layer. The dielectric layer comprises the following raw materials: a BMYT main matrix, an NN material, magnesium oxide, manganous-manganic oxide, zirconium dioxide, calcium carbonate, strontium carbonate and rare earth oxide; through the raw material composition and the preparation method of the ceramic dielectric capacitor, the prepared ceramic dielectric capacitor has excellent performances of high dielectric constant, high voltage resistance, stable dielectric-temperature characteristic curve, low loss, high insulation resistance, long-term high-voltage reliability and the like under the condition of high dielectric thickness (30 microns before firing).

The invention discloses a dark golden velvet texture ceramic rock plate, base glaze and a preparation method of the dark golden velvet texture ceramic rock plate, the dark golden velvet texture ceramic rock plate is prepared from golden velvet base glaze materials, water, carboxymethyl cellulose and sodium tripolyphosphate according to the mass ratio of 100: 36: (0.1-0.2): (0.3-0.5) through mixing and ball milling; the gold velvet base glaze is prepared from the following components in parts by weight: 3-8 parts of wollastonite, 5-10 parts of dolomite, 10-15 parts of strontium carbonate, 2-5 parts of calcined talc, 30-40 parts of potassium feldspar, 5-10 parts of nepheline, 5-10 parts of calcined kaolin, 5-15 parts of quartz, 1-5 parts of white corundum, 3-8 parts of calcined zinc oxide and 10-15 parts of matte transparent frit; the matte transparent frit comprises the following components in percentage by mass: 55%-60% of SiO2, 12%-15% of AL2O3, 2%-3% of K2O, 3%-4% of Na2O and 20%-25% of CaO, and the burning vector of the matte transparent frit is 1%-5%. According to the scheme, the light transmittance of a glaze layer is improved, the transparency is improved, meanwhile, the surface gloss can be kept to be uniformly dispersed and is not clear, and the glaze touch feeling is soft like velvet.

The invention discloses a glaze with a shell luster effect, a shell pearlescent glazed tile and a preparation method thereof, and the glaze comprises the following raw material components in parts by weight: 14-24 parts of modified shell frit, 10-15 parts of albite, 9-16 parts of dolomite, 6-10 parts of kaolin, 6-9 parts of zinc oxide, 11-16 parts of strontium carbonate, 6-9 parts of limestone, 2-6 parts of barium carbonate and 15-25 parts of lithium feldspar. The modified shell frit is introduced and matched with other specific raw materials to prepare the glaze capable of presenting shell luster, so that a glass phase and a crystal phase with different refractive indexes are separated out in the firing process of the glaze, a shell-shaped iridescent and soft light effect is simulated, and a glaze surface has wear resistance, skid resistance and antifouling properties and has good physical properties.

The invention relates to the technical field of building ceramics, in particular to waxy antifouling matte glaze and a preparation method and application thereof.The waxy antifouling matte glaze is prepared from, by mass, 7-10 parts of kaolin, 6-15 parts of calcined kaolin, 4-8 parts of quartz, 20-30 parts of potassium feldspar, 5-15 parts of albite, 5-10 parts of wollastonite, 1-5 parts of zinc oxide, 5-10 parts of strontium carbonate, 5-12 parts of barium carbonate and 10-20 parts of crystalline frit; the crystalline frit is prepared from the following raw materials in parts by mass: 25 to 35 parts of kaolin, 3 to 8 parts of calcined aluminum oxide, 20 to 35 parts of calcite, 0.5 to 3 parts of dolomite, 5 to 10 parts of zinc oxide, 25 to 35 parts of potassium feldspar, 0.5 to 3 parts of barium carbonate and 1 to 5 parts of anorthite powder. The waxy antifouling matte glaze provided by the invention not only has antifouling performance, but also has high hardness and high wear resistance on the premise of having matte texture and waxy silky hand feeling, so as to overcome the defects in the prior art.

The invention relates to the technical field of building glazed tiles, in particular to an antibacterial glazed tile and a preparation method thereof.The antibacterial glazed tile comprises a green body layer and an antibacterial glaze layer which are sequentially arranged from bottom to top; wherein the antibacterial glaze layer is obtained by calcining antibacterial glaze; the antibacterial glaze is prepared from the following raw materials: high-temperature antibacterial frit, calcined kaolin, corundum, quartz, dolomite, calcined talc, strontium carbonate, wollastonite, potassium feldspar and albite; the high-temperature antibacterial frit is prepared from the following raw materials: zirconium silicate, a silver antibacterial agent, calcined aluminum oxide, calcined talc, quartz, wollastonite, kaolin, calcium phosphate, potassium feldspar, albite, boric acid and lithium carbonate. According to the antibacterial glazed tile and the preparation method thereof provided by the invention, the formula of the antibacterial glaze is optimized, so that the antistatic property and the corrosion resistance can be improved on the premise of ensuring the antibacterial property of the antibacterial glazed tile.

The invention relates to the technical field of architectural ceramics, and discloses an antifouling matte archaized brick and a preparation method thereof.The preparation method comprises the steps that A, a green body layer is prepared; b, applying ground glaze to the surface of the green body layer; c, applying the antifouling matte glaze on the surface of the ground coat layer; d, firing; the antifouling matte glaze is prepared from the following raw materials in parts by weight: 7-10 parts of kaolin, 5-10 parts of calcined kaolin, 4-8 parts of quartz, 20-30 parts of potassium feldspar, 8-15 parts of albite, 5-10 parts of calcite, 5-10 parts of calcined talc, 1-3 parts of zinc oxide, 2-5 parts of strontium carbonate and 20-30 parts of antifouling wear-resistant frit. The antifouling wear-resistant frit comprises the following chemical components in percentage by weight: 32 to 40 percent of SiO2, 18 to 20 percent of Al2O3, 18 to 20 percent of CaO, 0.5 to 1.5 percent of K2O, 10 to 12 percent of ZnO, 1 to 2.5 percent of BaO and 12 to 15 percent of SrO. According to the scheme, the glossiness, the antifouling performance, the hardness, the abrasion resistance and the color development performance can be considered at the same time under the existing firing condition, and the use satisfaction degree of consumers on the archaized brick is improved.

The invention discloses an ultrahigh-strength metal powder core type flux-cored wire and a preparation method thereof, the ultrahigh-strength metal powder core type flux-cored wire comprises a steel strip and a flux core, the steel strip is filled with the flux core, and the flux core comprises 0.03%-0.10% of carbon, 0.3%-1.0% of silicon, 1.0%-3.0% of manganese, 2.6%-3.0% of nickel, 0.5%-1.0% of molybdenum, 0.3%-1.0% of chromium, 0.1%-0.4% of copper, 0.001%-0.020% of boron, 0.03%-0.07% of titanium, 0.05%-1.0% of magnesium, 0.3%-0.6% of aluminum, 1.2%-3.0% of calcium silicate, 0.3%-0.8% of strontium carbonate, 0.3%-0.8% of lanthanum carbonate, and the balance iron. 0.5 to 1.5 percent of sodium fluoride, 0.08 to 1.0 percent of modified titanium dioxide and the balance of Fe and other impurities. The invention belongs to the technical field of welding materials, and the welding wire has the characteristics that all components of the welding wire are fully matched, the melt fluidity is good in the welding process, filling is good, air holes are few, the high welding flux reaction rate is high, and the wire feeding rate is high.

The invention relates to the technical field of architectural ceramics, and discloses a waxy antifouling matte archaized brick and a preparation method thereof.The preparation method comprises the steps that A, a green body layer is prepared; b, applying ground coat; c, applying wax antifouling matte glaze; d, firing; the waxy antifouling matte glaze comprises an antifouling matte glaze and waxy dry particles, wherein the waxy dry particles are composed of particles with the mesh number being larger than or equal to 150 and smaller than 200 and particles with the mesh number being 200-250; the antifouling matte glaze is prepared from the following raw materials in parts by weight: 7-10 parts of kaolin, 5-10 parts of calcined kaolin, 4-8 parts of quartz, 20-30 parts of potassium feldspar, 8-15 parts of albite, 5-10 parts of calcite, 5-10 parts of calcined talc, 1-3 parts of zinc oxide, 2-5 parts of strontium carbonate and 20-30 parts of antifouling wear-resistant frit. According to the scheme, glossiness, antifouling performance, hardness, abrasion resistance and color development performance can be considered at the same time under the existing firing condition, the archaized brick is endowed with fine, oily and smooth waxy hand feeling, and the use satisfaction degree of consumers is improved.

The invention belongs to the technical field of magnetic material preparation, and particularly relates to a production process of high-performance rare earth permanent magnetic ferrite magnetic powder. The process comprises the following steps: preparing iron oxide red and auxiliary materials, wherein the auxiliary materials comprise calcium carbonate, strontium carbonate, lanthanum oxide and cobalt oxide; mixing the raw materials in proportion, and then carrying out dry ball-milling densification to obtain a mixed material; the obtained mixture is subjected to steam treatment, the water content of the mixture reaches 2%-5%, then curing is conducted, the curing time is at least 30 min, and the curing process is completed in the auger transfer process; pelletizing is performed; pre-sintering is performed; and coarsely crushing and sieving the pre-sintered material to obtain the rare earth permanent magnetic ferrite magnetic powder. Through steam pretreatment and curing, the strength and thermal stability of the ball material are remarkably improved, the ball material is kept complete and good in fluidity in the kiln, and the consistency and the qualified rate of products are improved.

The application belongs to the technical field of magnetic material preparation, and particularly relates to a production process of high-performance rare earth permanent ferrite magnetic powder. The process comprises the following steps: preparing iron red and auxiliary materials, wherein the auxiliary materials comprise calcium carbonate, strontium carbonate, lanthanum oxide and cobalt oxide; mixing raw materials in proportion, then performing dry ball milling to obtain mixed materials; performing steam treatment on the obtained mixed materials to make the water content of the mixed materials reach 2-5%, then performing ripening, and the ripening time is at least 30 min, and the ripening process is completed in the screw conveyor; balling; pre-sintering; performing coarse crushing on the pre-sintered materials and sieving to obtain rare earth permanent ferrite magnetic powder. Through steam pretreatment and ripening, the strength and thermal stability of the ball materials are significantly improved, the ball materials remain complete in the kiln, the flowability is good, and the consistency and qualified rate of the product are improved.

The application relates to a three-dimensional hollow network structure boron nitride, and a main process of a preparation method thereof is as follows: taking citric acid, sodium borate and strontium carbonate as raw materials, a boron-containing precursor is obtained through a sol-gel method; then, the boron-containing precursor is pre-nitridated under a nitrogen-containing atmosphere to obtain a pre-nitridation product; next, the pre-nitridation product is uniformly mixed with ammonium borate and ammonium chloride through ball milling, and then is placed into a high-pressure reaction kettle to react, so that the three-dimensional hollow network structure boron nitride is obtained. The three-dimensional hollow network structure boron nitride prepared by the application has a connected network structure formed by multiple cavity units, has high purity, provides a new idea for preparation of a hollow boron nitride structure, and has a good application prospect in the fields of gas adsorption, water pollution treatment, hydrogen storage and a drug carrier.

A preparation method and application of an iron-gold / oxygen-deficient strontium titanate one-dimensional hollow nanotube composite photocatalyst, which relates to a preparation method and application of a photocatalyst. The present invention is to solve the problem that the prior art prepares a strontium titanate-based composite photocatalyst with low photogenerated carrier separation efficiency and lacks methane adsorption sites and catalytic active centers for activating oxidants. In the present invention, strontium ions in strontium nitrate are first coordinated with a complexing agent acetylacetone to form a strontium acetylacetonate intermediate, and then reacted with tetrabutyl titanate to form a strontium titanate precursor, and then the precursor solution is electrostatically spun in combination with subsequent calcination treatment to form a strontium titanate one-dimensional hollow nanotube, and then a sodium borohydride vacuum hydrogen reduction treatment is performed to obtain a strontium titanate one-dimensional hollow nanotube with surface oxygen defects, and finally a step-by-step freezing photoreduction method is used to induce metal gold and iron to be modified on the surface of oxygen-deficient strontium carbonate to obtain an iron-gold / oxygen-deficient strontium titanate one-dimensional hollow nanotube composite photocatalyst.

The invention discloses a preparation method and application of boron-nitrogen-doped strontium titanate. The preparation method comprises the following steps: preparing a precursor I boron-doped titanium dioxide from hydrothermal TiB2; mixing the precursor I with strontium carbonate, and calcining at high temperature to prepare boron-doped SrTiO3; and then nitriding to obtain the boron-nitrogen-doped SrTiO3. The precursor I and strontium carbonate are mixed and then calcined at high temperature to synthesize boron-doped strontium titanate, the boron-nitrogen co-doped strontium titanate can be prepared by nitriding in ammonia gas flow, and the boron-nitrogen co-doped strontium titanate shows corresponding activity in the field of photocatalytic pollutant degradation.

An active cathode material for a chloride-ion battery according to the present invention is a strontium ruthenium oxide with a layered perovskite structure. A process for producing an active cathode material according to the present invention comprises (a) preparing a raw material mixture by mixing strontium carbonate and ruthenium oxide, (b) pelletizing the raw material mixture into pellets, and (c) firing the pellets. A cathode composite material for a chloride-ion battery according to the present invention comprises the active cathode material according to the present invention. The chloride-ion battery according to the present invention comprises a layer of active cathode material, and the layer of active cathode material contains the cathode composite material according to the present invention.

The invention belongs to the technical field of biochemical engineering, and relates to a method for separating and purifying pyrroloquinoline quinone in fermentation liquor by using soluble strontium salt. Performing membrane filtration on the PQQ-containing fermentation liquor to remove solid particles and macromolecular impurities with the molecular weight of not less than 10,000 Daltons in the fermentation liquor; adding a strontium salt solution into the filtrate subjected to membrane filtration, and reacting to generate an organic strontium precipitate; strontium salt adopted in the strontium salt solution is water-soluble strontium salt; adding the organic strontium precipitate into the carbonate solution, adjusting the pH value of the solution to be alkaline to convert the organic strontium precipitate into strontium carbonate precipitate, and then carrying out solid-liquid separation to obtain a separation solution containing pyrroloquinoline quinone anions; and adjusting the pH acidity of the separation solution containing the pyrroloquinoline quinone anions, and filtering to obtain the pyrroloquinoline quinone. The method is completely based on a water phase system, separation and purification of PQQ in the fermentation liquor are achieved through precipitation conversion water phase extraction, the separation and purification process is simplified, and the cost is reduced.

The invention relates to the technical field of zinc hydrometallurgy, and discloses a method for rapidly determining the content of calcium, iron and barium in strontium carbonate by using ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry), a strontium carbonate sample is directly dissolved by using dilute nitric acid, filtration is not needed, and the pretreatment process is simplified; meanwhile, by optimizing instrument parameters and analysis wavelength of ICP-AES, rapid, synchronous and accurate determination of three impurity elements of calcium, iron and barium is realized. The method is easy and convenient to operate, high in analysis speed, good in precision and high in accuracy, can meet the requirement for rapid monitoring of the strontium carbonate raw material quality in the zinc hydrometallurgy industry, and provides reliable technical support for optimizing lead removal process parameters, improving the cathode zinc quality and reducing the production cost.

The invention relates to the field of ceramic technology, and discloses a protective glaze, a marble plate and a preparation method thereof. The raw materials for preparing the protective glaze include, by weight, 20 to 24 parts of albite, 9 to 11 parts of kaolin, 7 to 9 parts of dolomite, 3 to 4 parts of strontium carbonate, 3.5 to 4.5 parts of zinc oxide, 3.5 to 4.5 parts of low-temperature frit, 25 to 31 parts of high-aluminum frit, 8 to 10 parts of quartz powder, and 2 to 3 parts of wollastonite. The protective glaze is composed of special raw materials, especially the combination of high-aluminum frit and low-temperature frit, dolomite and wollastonite, to obtain a glaze with a relatively high-temperature viscosity. The glaze will not basically flow during the firing process, and maintain a molding effect close to the initial shape. When applied to a marble plate with a concave texture, the concave texture formed by the pattern layer can be kept in a concave or convex state, thereby having a better three-dimensional effect.

This invention discloses a slab with a crystalline effect. The slab includes a blank layer, on the surface of which a glaze modifier is applied to form a glaze modifier layer. The glaze modifier comprises the following raw materials in parts by weight: 5-8 parts potassium feldspar, 4-7 parts calcined talc, 3-5 parts modified translucent stone agent, 3-5 parts calcium oxide, 2-4 parts barium oxide, 1-3 parts cobalt oxide, and 2-4 parts strontium carbonate modifier. The slab with a crystalline effect of this invention is formed by applying the glaze modifier. The glaze modifier uses potassium feldspar, calcined talc, calcium oxide, barium oxide, and cobalt oxide as a matrix. By adding strontium carbonate modifier and modified translucent stone agent, the two are synergistically enhanced, improving the crystalline effect of the product and increasing its stain resistance and easy-to-clean properties. Simultaneously, the product exhibits significant improvements in scrub resistance and alkali corrosion resistance.