161 results about "Boric acid" patented technology

A boron-containing polyethylene glycol fatty acid ester surfactant belongs to the field of organic chemistry and functional materials. The boron-containing polyethylene glycol fatty acid ester surfactant is prepared as follows: polyethylene glycol (PEG), boric acid and fatty acid are used as raw materials, first esterification reaction of the PEG and the boric acid is performed, then esterification reaction of the PEG and the fatty acid is performed to obtain boron-containing poly ethylene glycol fatty acid ester; by changing the species of fatty acids and catalysts and molecular weight of the PEG, the esterification rate can be enhanced, the boron-containing poly ethylene glycol fatty acid ester product can be used as a surfactant, and the boron-containing poly ethylene glycol fatty acid ester can reduce water surface tension and has good emulsifying properties.

The invention provides a thermal response self-ceramization fireproof coating and a preparation method thereof. The thermal response self-ceramization fireproof coating is prepared from the following raw materials in parts by mass: 3 to 10 parts of acrylic monomer, 3 to 10 parts of organic sulfonate, 1 to 4 parts of silane coupling agent, 0.5 to 3 parts of silicate ester, 4 to 6 parts of ceramic precursor, 3 to 6 parts of fluxing agent and 0.05 to 0.4 part of initiator. The fluxing agent comprises a component A and a component B, the component A is one of boric oxide, zinc borate or low-melting-point glass powder, and the component B is one of phosphorus pentoxide and ammonium polyphosphate. The silane coupling agent can be copolymerized with an acrylic monomer to construct a C-C main chain, the C-C main chain and silicate ester are subjected to hydrolytic condensation to form a Si-O-Si three-dimensional network, a chemical cross-linked skeleton is formed, and the chemical cross-linked skeleton can generate silicon dioxide at high temperature to participate in a ceramization reaction; the ceramic precursor and silicate ester can form a strong physical cross-linking effect, so that the fireproof coating with a chemical and physical double-cross-linked network can be formed, and the fireproof coating has excellent mechanical property and machinability at normal temperature.

The invention discloses a wood-based composite phase-change material and a preparation method thereof, and belongs to the technical field of phase-change materials.The preparation method of the wood-based composite phase-change material comprises the following steps that wood is cut and then added into delignification liquid to be heated, the wood is taken out and washed with water, and delignified wood is obtained; the delignification wood is added into the modification liquid to be heated, and after being taken out, the delignification wood is washed and dried to obtain pretreated wood; mixing polyethylene glycol, citric acid and boric acid, heating and stirring to obtain a phase change material; dipping the pretreated wood into the phase change material for vacuum dipping, taking out and drying to obtain the phase change material. The modified liquid is prepared from an ethanol water solution, a modified filler, 2-(3, 4-cyclohexene oxide) ethyltrimethoxysilane and triethylamine. The delignification liquid and the modification liquid are adopted for pretreating the wood, so that the wood can be better firmly combined with the phase change material, leakage is prevented, and the finally prepared wood-based composite phase change material has excellent heat management capacity and stability.

The invention relates to a method for preparing high-purity bismuth by removing impurity lead in refined bismuth through oxidation slagging, and belongs to the technical field of non-ferrous metals. Melting and oxidizing: melting a lead-containing refined bismuth raw material at 300-400 DEG C, adding bismuth oxide into the molten bismuth, and fully stirring to enable the bismuth oxide and lead to generate oxidation reaction to generate lead oxide; slagging reaction: adding boric anhydride (B2O3) into the melt, and enabling the boric anhydride (B2O3) to react with the generated lead oxide to generate lead borate slag; slag salvaging and lead removal: stirring for 30-60 minutes at the temperature of 300-400 DEG C in a heat preservation manner, so that the slagging reaction is fully carried out, generated lead borate slag with lower density floats to the surface of a melt, and a lead-containing slag phase is removed in a mechanical or manual slag salvaging manner; and after the slag salvaging process is finished, cooling the bismuth melt under a protective atmosphere until the bismuth melt is solidified to obtain a lead-removed high-purity bismuth product. According to the method, bismuth oxide and boric anhydride are introduced, metal lead is converted into lead borate slag easy to float, efficient and deep separation of lead and bismuth melt is achieved through the density difference, and the lead content can be reduced to 1 ppm or below.

The invention discloses a method for measuring the content of calcium fluoride in dolomite-containing fluorite mine. The method comprises an acetic acid solution, a hydrochloric acid solution, a triethanolamine solution, a potassium hydroxide solution and boric acid. The method for measuring the content of calcium fluoride in the dolomite-containing fluorite mine comprises the following steps: S1, reagent proportioning; s2, preparing a calcium standard solution; s3, preparing an EDTA standard titration solution; s4, selecting an instrument; s5, preparing a sample; s6, step analysis; s7, content correction and determination; and S8, calculating a result. The invention belongs to the technical field of calcium fluoride content determination, and particularly relates to a method for measuring the content of calcium fluoride in dolomite-containing fluorite mine, compared with the prior art, the method solves the problem of dolomite dissolution when calcium carbonate is leached by acetic acid, and the content of calcium fluoride in the fluorite mine can be measured by accurately calculating the dissolution amount of dolomite. The measured calcium fluoride content is clearer, more reasonable and more reliable and approaches to a true value, and the process operation is simple and rapid, and is suitable for the requirements in the fields of mine production, assay detection and the like.

The invention relates to the technical field of power cables, and provides a flame-retardant power cable and a preparation method thereof. The flame-retardant power cable comprises a conductor, an insulating layer and a sheath layer which are sequentially arranged from inside to outside, and the sheath layer is prepared from, by weight, 40-60 parts of polyethylene, 60-80 parts of ethylene-vinyl acetate copolymer, 8-10 parts of compatilizer, 3-5 parts of auxiliaries, 15-20 parts of filler and 60-70 parts of flame retardant. The flame retardant is prepared from magnesium hydroxide, antimony trioxide, hydrated zinc borate and an aromatic bromine-containing compound in a mass ratio of 45: 8: 12: (25-30), and the number of bromine atoms of the aromatic bromine-containing compound is 6-8. According to the technical scheme, the problem of insufficient flame retardant property of the power cable in the prior art is solved.

Methods for the production of rare earth magnetic materials including magnetic crystals of Nd2F14B and the magnetic materials produced thereby. The methods lead to the formation of magnetic materials having a high concentration of Nd2F14B crystals. The method comprises steps of: admixing a neodymium borate powder, iron powder and calcium hydride to form a precursor powder; compacting the precursor powder to form a compacted precursor powder body; and heating the compacted precursor powder body to form a consolidated powder body.

The application discloses a kind of determination methods and program products of core reactivity state, the method includes: the key state parameter in the process of core reaction is collected, key state parameter includes at least one of core power distribution parameter, coolant temperature, coolant density, control rod position, boric acid concentration and burnup;Determine the burnup step of fuel, the evolution process of fissile nuclide and fission product in core is modeled based on the burnup step of fuel and burnup model, to obtain the reactivity parameter related to the burnup of fuel, the burnup model is used to describe the nuclide transmutation and consumption logic of fuel during the operation of core;Corresponding digital twin is constructed with the reactivity state of the core, the reactivity state of the core is mapped by the digital twin based on the reactivity parameter and the key state parameter driving, can realize high-precision, real-time, full life cycle dynamic digital mapping and intelligent detection of core reactivity state.

Provided herein are compositions and methods to improve plant resistance to abiotic and biotic stress, thereby improving crop yield. Provided herein are compositions including zinc, copper, and an acid, where the acid is selected from citric acid, sulfuric acid, oxalic acid, humic acid, fulvic acid, boric acid, acetic acid, and a combination thereof. Certain embodiments optionally include ammonium sulfate. Compositions described herein have plant priming activity where the plant's defenses against abiotic and biotic stress are boosted.

The application discloses a kind of north fruit tree spring frost injury freeze protection fluid and its preparation and application method, the freeze protection fluid is by plant growth regulator, saccharide, amino acid component, mineral nutrient component, boric acid and film-forming protective component and water compound, each raw material is mixed uniformly according to defined mass fraction ratio. When using, stock solution dilution 300-700 times, 24-72h before frost, it is suitable for cherry, apple, pear, apricot and other north fruit tree flowering freeze protection. The application has multiple effects of freeze protection, membrane stabilization, repair and nutrient supplementation, can maximize protect cell integrity and reduce irreversible necrosis at low temperature. Even if suffering from low temperature freeze injury, the flower organ is less damaged after spraying the freeze protection fluid, and recovers quickly.

The present application relates to a special coating for water-cooled wall surface of coal-fired boiler, in particular to a coating for water-cooled wall surface of coal-fired boiler, a preparation method and application thereof. The coating comprises nano-tungsten powder, tungsten carbide, rare earth compound, sodium borate, potassium chromate, rock asphalt, binder, modifier, dispersant, defoaming agent, curing agent and solvent. The coating is fused on the water-cooled wall surface of coal-fired boiler, the obtained coating has good interface bonding with the water-cooled wall base material, low porosity, avoids the penetration of corrosive gas and liquid, solves the corrosion problem of water-cooled wall, and also avoids the reduction of coating hardness and wear resistance; the coating is not easy to wear and damage in long-term use, can improve the high-temperature resistance, hardness, corrosion resistance and wear resistance of the water-cooled wall surface of boiler, effectively prolongs the service life of the water-cooled wall surface of boiler, and further ensures the safe and stable operation of coal-fired boiler.

This invention provides an antistatic and privacy-protecting polarizing film and its preparation process, belonging to the field of polarizing film preparation technology. The preparation process includes the following steps: preparation of an antistatic agent; preparation of a modified adhesive; preparation of a composite polarizing film; and preparation of the polarizing film. This invention introduces an antistatic agent and POSS-modified graphene oxide into the modified adhesive, making the adhesive layer a conductive medium connecting multiple layers such as the polarizing film (PVA), TAC layer, and privacy film, forming a cross-layer conductive path. This avoids static electricity accumulation at the interface, improving the antistatic effect. Boric acid is first used to crosslink the PVA film, followed by glyoxal crosslinking, achieving long-term reliability of the polarizing film under high temperature and high humidity environments.

The invention discloses high-temperature underglaze Chinese red glaze as well as a preparation method and application thereof, and belongs to the technical field of ceramic high-temperature underglaze colored glaze materials. The high-temperature underglaze Chinese red glaze comprises a high-temperature red pigment, a glaze matrix and related additives, wherein the high-temperature red pigment comprises a base material and a coloring element and is a core coloring component of the Chinese red glaze; the glaze matrix comprises potassium feldspar, muscovite, quartz sand, boric acid and wollastonite, and can be fused at high temperature to form a transparent or semitransparent vitreous layer to wrap and protect the pigment and provide good glaze gloss and flatness at the same time; related additives comprise a shaping agent, a dispersing agent and a mineralizing agent, and the colored glaze processing property can be improved. In addition, the invention further provides a preparation method and a sintering process of the high-temperature underglaze Chinese red glaze, Chinese red can be sintered at the temperature of 1300-1400 DEG C, the glaze color is bright, the chroma is full, the color is normal, darkening and blackening are avoided, and the high artistic value and process practicability are achieved.

The application provides an Ag etching solution, a preparation method and application thereof. The Ag etching solution comprises the following components in a weight ratio: 40-80 parts of inorganic acid; 10-50 parts of organic acid; 0.05-1.5 parts of corrosion inhibitor; 0.1-2 parts of chelating agent; 1-7.5 parts of buffer; and 30-50 parts of ultrapure water. The application further discloses a preparation method of the Ag etching solution and application thereof in the field of etching ITO-Ag-ITO composite layers. The inorganic acid is selected from one or more of phosphoric acid, sulfuric acid, carbonic acid, boric acid, hydrobromic acid, iodic acid, hypoiodous acid, hydrofluoric acid and nitric acid. The inorganic acid is preferably phosphoric acid and nitric acid. The Ag etching solution has a stable etching rate for ITO-Ag-ITO, and is not damaged to the insulating layer and photoresist, and can be used in the OLED pixel electrode manufacturing process, and the Ag layer is not provided with burrs and is not shrunk after etching.

The invention relates to the technical field of fireproof materials, and discloses a fireproof plugging material and a preparation method thereof, and the fireproof plugging material comprises the following components by mass: 20-40 parts of a metal oxide enriched phosphate gelling system, 10-25 parts of an expansion main body, 5-15 parts of a synergistic fluxing and heat absorbent, 30-50 parts of an in-situ reactive aggregate, and 1-5 parts of reinforced fibers. According to the preparation method, a four-stage chain reaction system of expansion, synergistic fluxing, volatilization inhibition and in-situ welding is constructed, an oxygen-enriched phosphate gelling system provides BO volatilization inhibition capability and a POprecursor, boric acid provides a low-temperature endothermic effect and a BO precursor, the oxygen-enriched phosphate gelling system and the boric acid form a phosphorus borate eutectic melt at the temperature of 600-900 DEG C, and the low-temperature heat absorption effect and the BO precursor form a low-temperature heat absorption effect and a low-temperature heat absorption effect at the temperature of 600-900 DEG C; and the melt further reacts with wollastonite to generate a calcium-magnesium-boron-phosphorus-silicate glass phase, and a loose carbon layer obtained after expandable graphite is expanded is welded, so that the core contradiction that high expansion rate and high-temperature residual strength cannot be considered at the same time in the prior art is effectively solved.

This application belongs to the field of water quality testing technology, specifically relating to a method for testing ammonia nitrogen in wastewater from the hydrometallurgical process of laterite nickel ore. The method includes the following steps: adding sodium thiosulfate and zinc sulfate to the wastewater, adjusting the pH with a boric acid-sodium hydroxide buffer solution to pH 9.5, and allowing the solution to stand; filtering, taking an appropriate amount of filtrate into a colorimetric tube, and adjusting the volume, then adding potassium sodium tartrate and Nessler's reagent, mixing well, and allowing it to stand; measuring the absorbance, and calculating the ammonia nitrogen concentration in the wastewater based on the absorbance. This method can effectively eliminate the interference from high sulfate content and metal ions in high-sulfate industrial wastewater. The resulting colorimetric system is highly stable and has the advantages of being simple to operate and providing reliable results. It holds significant importance for the testing and treatment of wastewater from the hydrometallurgical process of laterite nickel ore.

The invention discloses a wax recovery treatment method which comprises the following steps: stirring, dissolving and precipitating wax in a sodium hydroxide solution to obtain supernate; adding the supernatant into boric acid, stirring to obtain jelly, filtering the jelly, washing, and drying to obtain a dried substance; mixing and stirring the dried substance and methanol, and drying to obtain a wax solid substance; and purifying the wax solid with a distillation extract of petroleum ether. According to the method, impurities in the wax are effectively removed, and the recovery purity and quality of the wax are improved, so that the service life of the wax is prolonged, the production cost is reduced, and the aims of saving resources and protecting the environment are fulfilled.

The application relates to the technical field of saline-alkali soil improvement, and particularly discloses a preparation method of a saline-alkali soil improvement slow-release fertilizer, which comprises the following steps: (1) uniformly mixing carbon powder, plant nutrient solution, molasses and seaweed acid powder, granulating the obtained mixture, mixing the obtained granules with carbon powder again to coat the granules, separating the granules, drying the granules, and obtaining a nutrient core; (2) uniformly mixing gypsum powder, carbon powder and water to form a coating slurry; coating the slurry on the surface of the nutrient core, and drying the nutrient core to obtain precursor granules; (3) uniformly mixing boric acid or lactic acid, carbon powder, gypsum powder and water to form a coating slurry; coating the slurry on the surface of the precursor granules, and drying the precursor granules to obtain the saline-alkali soil improvement slow-release fertilizer. The slow-release fertilizer prepared by the process can improve the exchange capacity of sodium ions in the soil, improve the soil nutrition degree and air permeability, and is beneficial to the growth of plants.

The invention relates to an efficient phosphorus removal embedded bioactive filler and a preparation method thereof, and belongs to the fields of sewage and wastewater treatment and low-carbon and water pollution control. Activated sludge of an urban sewage treatment plant is used as a bacterium source for separation, enrichment and directional culture of a phosphorus-accumulating bacterium flora. The preparation method comprises the following steps: preparing a colloidal embedding material from components (phosphorus-accumulating bacteria culture, PVA, diatomite, wooden activated carbon, calcium carbonate, trace elements and the like); extruding into a pipe strip shape by using an extruder; placing the extrudate in a saturated boric acid solution for cross-linking for 4 hours, washing with clear water, curing and cutting; and finally, soaking the obtained filler in a saturated phosphate solution for 4 hours, and cleaning with clear water to obtain the efficient phosphorus removal embedded bioactive filler. The biological phosphorus removal effect is enhanced by the phosphorus removal embedded bioactive filler, and the system has good mud-water separation performance, supports efficient recovery and resource utilization of phosphorus in water, and has both environmental benefits and economic benefits.

The invention provides a flame retardant capable of replacing antimony trioxide, a preparation method and application in a PVC cable material, and the flame retardant comprises the following components in parts by weight: 20-40 parts of zinc borate, 0-20 parts of zinc oxide, 10-30 parts of spherical silicon dioxide, 0-10 parts of diethylene glycol monobutyl ether, 20-40 parts of low-temperature glass powder and 0-5 parts of a silane coupling agent. The spherical silicon dioxide also needs to be modified by the following method: adding the spherical silicon dioxide into an organic solvent for dispersing, adding a siloxane monomer for stirring, then adding a siloxane coupling agent for stirring, and freeze-drying to obtain a powder product; adding the powder product and the pentaerythritol type chlorinated diphosphate into a container, adding a catalyst, and reacting for 1-2 hours under the conditions of 30-50 DEG C and normal pressure to obtain an intermediate product; and carrying out rotary evaporation drying on the intermediate product, washing to be neutral, and drying in a drying oven to obtain the modified spherical silicon dioxide. The flame-retardant PVC cable material has excellent flame-retardant performance, and can replace more than 50% of antimony trioxide in the formula of the PVC cable material.

The utility model relates to a pulverization device for chemical raw materials, which belongs to the field of boric acid bulk drug preparation and comprises a barrel, a feed hopper fixedly communicated with the top of the barrel, a controller fixedly mounted outside the barrel, a grinding disc detachably connected to the inside of the barrel and a filter plate arranged inside the barrel. And a vibrating mechanism used for vibrating the filter plate is arranged in the barrel, a grinding mechanism is arranged in the grinding disc, and the vibrating mechanism comprises a mounting box, a first double-shaft motor, a rotating shaft, a cam, a spring and a connecting base. According to the pulverizing device for the chemical raw materials, a first double-shaft motor is started to work through a controller, an output shaft of the first double-shaft motor drives two cams to rotate through a rotating shaft, the cams drive a filter plate to vibrate under the elastic acting force of springs, and filter holes of the filter plate are effectively prevented from being blocked by particle raw materials; and the continuity and efficiency of the powder making process are improved, and the advantage of high powder making quality is achieved.

The application discloses a hydrogen peroxide photocatalytic generation method in the technical field of hydrogen peroxide processing, and a graphene-like preparation method. Urea and boric acid are used as reactants to prepare graphene-like BN by a calcination method; a Sv-MoS2 / BN composite material is synthesized by dissolving BN in deionized water, ultrasonic treatment for 30 min, then adding 1.4 g of thiourea and 0.6 g of (NH4)6Mo7O 24 4H2O into the solution, stirring for 30 min, hydrothermal reaction for 18 h, cooling to room temperature, then cleaning and drying for 8-12 h, obtaining defect-rich Sv-MoS2 / BN, and then obtaining samples with Sv-MoS2 / BN contents of 0.01, 0.03, 0.05 and 0.07 g, which are respectively marked as Sv-MoS2 / BN-1, Sv-MoS2 / BN-3, Sv-MoS2 / BN-5 and Sv-MoS2 / BN-7; H2O2 generation: the obtained samples are respectively dissolved in 50 ml of deionized water, the reaction solution is stirred in the dark for 30 min before reaction, a 420 nm filter 300 w xenon lamp is used as a light source, the reaction is kept at 25 DEG C through a water circulation system, 3 ml of reaction suspension is taken out every certain time, solid substances are removed through a filter membrane, and then the generated H2O2 concentration is measured. The scheme aims to improve the efficiency of photocatalytic generation of H2O2.

The application discloses a kind of weather-resistant PVB resin and its preparation method and application.A kind of preparation method of weather-resistant PVB resin includes the following steps: polyvinyl alcohol aqueous solution is cooled to 4-12 ℃, then emulsifier, acid catalyst is added, stirring, aldehyde is added to perform acetalization reaction, after heat preservation 0.5-1.5 h, temperature is raised to 60-75 ℃, then boric acid salt is added, and it is maintained at 60-75 ℃ for 1-2 h;Add base to perform acid-base neutralization reaction, wash with water after acid-base neutralization reaction, then adjust pH value to 11-12 by adding base again, wash with water again, centrifugal to obtain final product.The PVB resin preparation method of the application, by adding boric acid salt additive, improves the oxidation corrosion resistance and heat resistance of the resin, thereby further improving weather resistance.

This invention discloses a process and coating structure for rare earth modified trivalent chromium pearl chromium plating on zinc alloys. The process includes sequentially preparing a cyanide-free copper plating layer, a cyanide-free copper-zinc alloy plating layer, a high-corrosion-resistant nickel-phosphorus alloy plating layer, a bright nickel-cobalt alloy plating layer, a pearl nickel plating layer, a rare earth modified trivalent chromium pearl chromium plating layer, and an anti-discoloration protective film on a zinc alloy substrate. The rare earth modified trivalent chromium pearl chromium plating process is as follows: chromium chloride hexahydrate 90-130 g / L, potassium chloride 90-160 g / L, ammonium chloride 90-160 g / L, ammonium bromide 18-28 g / L, ammonium formate 40-60 g / L, boric acid 45-65 g / L, rare earth additives 8-12 mL / L, leveling agent 2-4 mL / L, accelerator 1-3 mL / L, plating bath pH 2.5-3.2, plating bath temperature 25-35℃, and cathode current density 8-16 A / dm². The rare earth additives have a synergistic effect on improving the performance of trivalent chromium plating solution. No rust was observed on the surface of the plated parts after undergoing a neutral salt spray test for 132 hours according to GB / T 10125–2021 standard.

The invention belongs to the technical field of nuclear power station operation, and particularly relates to a method for maintaining a thermal state of a VVER nuclear power unit through an atmosphere release valve. Comprising the following steps that 1, after a primary loop reaches a hot state, the steam sides of four steam generators are separated from a main steam collecting pipe; 2, the temperature of the first loop is maintained within the thermal state temperature range through an atmosphere release valve; 3, primary loop leakage is supplemented in the form of distributing water to the drainage collecting box, and the liquid level of the primary loop is maintained; and 4, after the secondary loop rebuilds vacuum, the steam pipelines of the four steam generators are communicated with the main steam collecting pipe. The method has the beneficial effects that the extra cooling and heating process of the reactor after defect elimination can be avoided, and waste liquid generated in the process is greatly reduced; extra cooling and heating processes of the reactor can be avoided, and the unit starting time after overhauling is greatly shortened; the problem that the degasser cannot distribute water and only can supplement boric acid during a thermal state can be solved.

The invention belongs to the technical field of microbial fertilizers, and particularly relates to a low-temperature activated humic acid microbial agent and a preparation method thereof. The low-temperature activated humic acid microbial agent is prepared from the following raw materials in parts by weight: 5 to 10 parts of microbial powder, 30 to 50 parts of low-temperature activated humic acid, 2 to 8 parts of modified diatomite, 10 to 20 parts of urea and 3 to 6 parts of boric acid. After the low-temperature activated humic acid microbial agent is applied to soil, the physicochemical properties of the soil can be effectively improved, and the soil fertility is improved, so that the growth of crops is promoted, the yield and quality of the crops are improved, and the low-temperature activated humic acid microbial agent has a wide application prospect.

The invention discloses a biomass-based multi-light-source excited X-ray response type long-afterglow phosphorescent material as well as a preparation method and application thereof, and belongs to the technical field of functional materials. According to the invention, a novel long-afterglow luminescent material is synthesized by using natural ellagic acid, boric acid, urea and the like as raw materials by using a microwave-assisted strategy. The long-afterglow luminescent material disclosed by the invention shows excellent multi-mode excitation responsiveness, can generate long-afterglow luminescence through irradiation of ultraviolet rays, natural sunlight and X rays, can emit afterglow as long as several hours under the ultraviolet rays and the sunlight, and can still generate luminescence under the irradiation of the X rays under the detection limit as low as 192.2 mu Gy s <-1 >; the method has the potential of anti-counterfeiting and X-ray imaging application.

The invention discloses light-color-adjustable Al < 3 + >-doped LiMgBO3: Dy < 3 + > fluorescent powder for an LED (Light Emitting Diode) and a preparation method thereof. The chemical formula of the fluorescent powder is LiMg (1-x-y) BO3: xDy < 3 + >, yAl < 3 + >, 0 < = x < = 0.03, and 0 < = y < = 0.04. The preparation method comprises the following steps: weighing raw materials according to a metering ratio, adding 2 wt% of boric acid as a cosolvent after a lithium source is excessive by 5-20%, grinding, mixing, calcining in air at 500-1000 DEG C for 2-15 hours, cooling and grinding to obtain a product. The fluorescent powder generates blue, yellow and red emission under excitation of near ultraviolet light, Al < 3 + > co-doping enhances Dy < 3 + > red light emission, white light output with good color rendering performance is obtained, and the fluorescent powder can be used for packaging near ultraviolet chip WLED devices.

In one embodiment, a building material derived from a geopolymer formulation comprises sand, ground granulated blast furnace slag (GGBFS), fly ash, sodium tetraborate, boric acid, zeolite, sodium caseinate, and SC-9. Optionally, the formulation also comprises additional constituents like sodium metasilicate, sodium hydroxide, magnesium oxide, hemp, basalt fibers, aggregates, and fillers. The building materials have high compressive strength, flexural strength, tensile strength, impact resistance, and thermal resistance.