272 results about "SODIUM METAPHOSPHATE" patented technology

The invention relates to the technical field of biology, in particular to a method for synthesizing S-sulfo-L-cysteine through multi-enzyme cascade catalysis. The invention provides a new route for biosynthesis of S-sulfo-L-cysteine, and a test result shows that serine, AMP, sodium hexametaphosphate and sodium thiosulfate are used as substrates, and the S-sulfo-L-cysteine is synthesized by a one-step method. A crude enzyme liquid which contains serine kinase, polyphosphoric acid-AMP phosphotransferase and phosphoserine dependent type S-sulfo-L-cysteine synthetase in which the background of tryptophanase and glutaredoxin cells is knocked out is used for synthesizing the S-sulfo-L-cysteine, the steps are simple, the product yield is high, the cost is low, and the method has a relatively strong industrial application prospect.

The invention belongs to the field of fermentation, and particularly relates to a complex microbial inoculant, original cheese, processed cheese with a blood sugar reducing function and preparation and application of the complex microbial inoculant. Wherein the processed cheese is prepared by the method comprising the following steps: mixing the components including raw cheese, sugarcane juice, corn oil, casein, concentrated milk protein, blueberry powder, mono / diglycerol fatty acid ester, sodium citrate, sodium tripolyphosphate, sodium hexametaphosphate, salt guar gum, potassium sorbate and water, and then emulsifying to obtain the processed cheese, the sugar cane juice, the corn oil, the casein, the concentrated milk protein, the blueberry powder, the mono / diglycerol fatty acid ester, the sodium citrate, the sodium tripolyphosphate, the sodium hexametaphosphate, the salt guar gum, the potassium sorbate and the water, the original cheese is prepared from a complex microbial inoculant, and the complex microbial inoculant comprises lactococcus lactis bacterial powder, lactococcus lactis subsp. Lactis bacterial powder, lactobacillus delbrueckii subsp. Lactis bacterial powder, lactobacillus plantarum bacterial powder and lactobacillus paracasei bacterial powder. The processed cheese provided by the invention has a better function of controlling blood sugar, and meanwhile, the processed cheese is fine and uniform in texture and has good smearing performance.

The invention discloses acid-resistant calcium carbonate and a preparation method thereof, and belongs to the technical field of calcium carbonate filler production. According to the invention, industrial waste carbide slag is used as a calcium source, and calcium hydroxide slurry is obtained through impurity removal; then adding sodium polyacrylate and sodium hexametaphosphate, stirring and dispersing, then introducing carbon dioxide for carbonization, adding a surfactant for ultrasonic activation after carbonization, and finally sequentially adding zirconium oxychloride and sodium silicate to prepare the acid-resistant calcium carbonate. The defects of traditional silicon dioxide and titanium dioxide coated calcium carbonate products are overcome, the prepared calcium carbonate product is compact and uniform in coating layer and good in stability, meanwhile, excellent acid resistance and mechanical property are considered, the calcium carbonate can be suitable for more acid environments, and the application range of calcium carbonate is effectively widened.

The invention relates to the technical field of reverse osmosis membrane maintenance, in particular to a cleaning scale inhibitor special for a reverse osmosis membrane and application of the cleaning scale inhibitor. The cleaning scale inhibitor provided by the invention comprises an agent A, an agent B and an agent C, the agent A comprises the following components in percentage by mass: 10-20% of organic phosphonic acid, 10-20% of polycarboxylic acid polymer, 5-10% of sulfamic acid, 3-8% of sodium gluconate and the balance of water; the agent B comprises 8-15% of an isothiazolinone bactericide, 5-10% of a nonionic surfactant, 3-8% of a chlorine bactericide, 2-5% of sodium dodecyl benzene sulfonate and the balance of water; and the agent C comprises 10-20% of sodium polyacrylate, 8-15% of sodium hexametaphosphate, 5-10% of citric acid, 3-8% of silicate and the balance of water. The cleaning scale inhibitor provided by the invention has an efficient cleaning effect on various pollutants, is environment-friendly, and does not cause chemical damage to a reverse osmosis membrane.

The invention relates to a self-dispersing pigment nano color paste for digital ink-jet printing and a preparation method thereof, and the self-dispersing pigment nano color paste is prepared from the following raw materials: 15-25 parts of carbon black, 10-17 parts of a surfactant, 8-13 parts of a dispersant, 13-30 parts of ethylene glycol, 3-5 parts of a stabilizer, 3-8 parts of a pH value regulator and 20-35 parts of deionized water. Methylisocyanate modified styrene-acrylic resin is used as a dispersing agent to act together with a surfactant, so that the uniform dispersion performance of pigment in the nano color paste is improved, the risk of blockage is reduced, sodium benzoate modified lauryl sodium sulfate is used as a stabilizer, the liquidity and spraying stability of the nano color paste in a spray head are enhanced, and the spraying effect is improved. In the system provided by the invention, ethylene glycol is used as a solvent, 2-aminopropanol, triethanolamine, sodium carbonate, sodium hexametaphosphate and sodium polyacrylate are mixed to be used as a pH value regulator, and deionized water is used for further enhancing the compatibility of the dye.

The invention belongs to the technical field of fire-extinguishing building materials, and discloses a microencapsulated efficient automatic fire-extinguishing patch and a preparation method thereof.The fire-extinguishing patch contains a fire-extinguishing microcapsule, the fire-extinguishing microcapsule is of a double-layer structure, the inner layer contains gelatin, kaolin, perfluorohexanone, sodium hexametaphosphate, resorcinol and glutaraldehyde, and the outer layer contains gelatin, kaolin, perfluorohexanone, sodium hexametaphosphate, resorcinol and glutaraldehyde; and the outer layer comprises a vinylidene fluoride-acrylic acid copolymer and glutaraldehyde. According to the invention, the flaky kaolin is used for enhancing the formaldehyde-free phenolic aldehyde inner layer and the vinylidene fluoride-acrylic acid copolymer outer layer to form a double-layer shell layer with high air tightness, so that the compactness and long-term stability of the shell layer of the microcapsule are greatly improved.

The invention relates to the field of polishing solutions, in particular to a cerium oxide micro powder grinding and settling method, a multi-core optical fiber connector polishing solution and a preparation method thereof.The cerium oxide micro powder grinding and settling method comprises the steps that sodium hexametaphosphate is added into deionized water and stirred to be dissolved, and dispersion liquid is obtained; adding cerium oxide coarse powder into the dispersion liquid, and stirring to obtain cerium oxide dispersion liquid; the cerium oxide dispersion liquid is subjected to grinding, sedimentation and centrifugal grading treatment, and supernatant is collected in the sedimentation and centrifugal grading treatment process; and precipitating, drying and crushing the supernate to obtain the cerium oxide micro powder. The cerium oxide micro powder prepared by the method is narrow in particle size range, can prevent large particles from scratching the end face of the multi-core optical fiber connector, and the prepared polishing solution is good in suspension property, free of scratching the end face of the multi-core optical fiber connector and easy to clean.

The invention provides a beneficiation method of low-grade superfine silt containing lithium, rubidium and cesium, which comprises the following steps: adding sodium hexametaphosphate and a collecting agent JXL-01 into ore pulp, stirring, and roughing to obtain lepidolite rough concentrate and flotation tailings I; a collecting agent JXL-01 is added into the flotation tailings I for two times of scavenging, the flotation tailings and two scavenging middlings are obtained, and the scavenging middlings are sequentially returned to the upper layer for operation; sodium hexametaphosphate is added into the lepidolite rough concentrate for two times of concentration, lepidolite concentrate and two concentrated middlings are obtained, and the two concentrated middlings are sequentially returned to the upper layer for operation. And the collecting agent JXL-01 is obtained by mixing dodecylamine and sodium alpha-olefin sulfonate according to the mass ratio of 3: 2. According to the method, comprehensive utilization of the lithium-rubidium-cesium-containing superfine silt is achieved, the recovery effect of the lithium-rubidium-cesium-containing superfine silt is effectively improved, and the method is a novel mineral separation method which is stable, efficient, high in adaptability and high in recovery index and is suitable for application and popularization.

The invention provides a high-selectivity flotation method for micro-fine particle lepidolite containing rubidium and cesium, which comprises the following steps: levigating raw lepidolite ore, and desliming to obtain a flotation material and slime; adding sodium hexametaphosphate and a collecting agent HT8-01 into the flotation material, stirring, and roughing to obtain lepidolite rough concentrate and flotation tailings I; a collecting agent HT8-01 is added into the flotation tailings I for two times of scavenging, flotation tailings and two scavenging middlings are obtained, and the scavenging middlings are sequentially returned to the upper layer for operation; sodium hexametaphosphate is added into the lepidolite rough concentrate for two times of concentration, lepidolite concentrate and two concentrated middlings are obtained, and the concentrated middlings are sequentially returned to the upper layer for operation; the collecting agent HT8-01 is obtained by mixing octadecylamine and sodium dioctyl sulfosuccinate according to the mass ratio of 5: 3. According to the method, the separation effect of the rubidium-cesium-lithium-containing mica and gangue minerals such as quartz and feldspar is improved, the problems that foam is too stable, the viscosity is too high and the size is too large are solved, and high-selectivity separation of the micro-fine-particle rubidium-cesium-lithium-containing mica is achieved.

The invention discloses a micro-arc oxidation surface modified biomedical titanium alloy with good friction corrosion resistance and a preparation method of the micro-arc oxidation surface modified biomedical titanium alloy. The micro-arc oxidation surface modified biomedical titanium alloy comprises a titanium alloy base material and a micro-arc oxidation coating located on the surface of the titanium alloy base material. The micro-arc oxidation coating comprises a compact layer and a sparse layer which are sequentially connected with the titanium alloy base material. EDS element analysis shows that the micro-arc oxidation coating contains a sodium element, an oxygen element, an aluminum element, a phosphorus element, a potassium element, a titanium element and a niobium element. The preparation method comprises the following steps: preparing a micro-arc oxidation electrolyte, wherein the micro-arc oxidation electrolyte comprises sodium titanate, potassium hydroxide, sodium hexametaphosphate and niobium particles; the titanium alloy base material serves as an anode, a stainless steel sheet serves as a cathode, the micro-arc oxidation electrolyte is loaded into an electrolytic cell, then a micro-arc oxidation electrolytic reaction is conducted, and the micro-arc oxidation coating is generated on the surface of the titanium alloy base material.

The invention belongs to the technical field of fine chemical engineering, and discloses hydroxypropyl crosslinked starch as well as a preparation method and application thereof. The preparation method of the hydroxypropyl crosslinked starch comprises the following steps: mixing starch and water to prepare starch milk; adding sodium phytate and urea; adding sodium sulfate and sodium hydroxide after cooling; adding epoxypropane for reaction; and adding sodium trimetaphosphate to react to prepare the hydroxypropyl crosslinked starch. The hydroxypropyl crosslinked starch prepared by the preparation method disclosed by the invention has excellent shear resistance, acid resistance and oxidation resistance.

The invention discloses a micro-arc oxidation coating for an artificial hip joint Ti6Al4V alloy and a preparation method of the micro-arc oxidation coating. The preparation method comprises the following steps that S1, pretreatment is conducted; s2, preparing a micro-arc oxidation electrolyte; s3, preparing a micro-arc oxidation coating; s4, cleaning and drying treatment; a preparation method of the electrolyte comprises the steps that 6 g of sodium metaaluminate solid powder, 4 g of potassium hydroxide solid powder, 2 g of sodium hexametaphosphate solid powder, 4 g of sodium silicate solid powder and 4 g of yttrium oxide nanoparticles are sequentially weighed and added into a beaker, then 980 mL of ultrapure water at the temperature of 60 DEG C is added into the beaker, and stirring is conducted for 2 min while the temperature is kept; the yttrium oxide particles are approximately spherical or ellipsoidal, the particle size range is 20-50 nm, and the purity is 99.99%. The yttrium oxide nanoparticles are introduced into the electrolyte, the micro-arc oxidation coating containing the yttrium oxide is prepared on the surface of the Ti6Al4V alloy, and compared with a traditional micro-arc oxidation coating, the surface porosity of the micro-arc oxidation coating containing the yttrium oxide is remarkably reduced, and the compactness is remarkably improved.

The invention provides a pitaya wine processing technology. The pitaya wine processing technology is optimized aiming at the problems that pigments are easy to degrade, the fermentation efficiency is low, and the flavor is single in a traditional technology. According to the raw material pretreatment, ultrasonic cleaning (0.05% sodium hexametaphosphate solution) is combined with metal ion control (Fe2 / Cu2 is less than or equal to 0.1 mg / L), and the juice yield is increased through composite enzymolysis (pectinase and cellulase). In the low-temperature fermentation stage, the period is shortened to 10 hours by utilizing fed-batch strain activation, and the retention rate of characteristic aroma is remarkably improved by combining pulse ultrasound and nitrogen protection (the oxygen content is less than or equal to 0.5 ppm); and through infrared monitoring and gradient cooling, accurate control of the alcoholic strength being 12% vol and the residual sugar being less than or equal to 4g / L is realized. In the aging stage, nitrogen is adopted to isolate oxygen (high-purity nitrogen is greater than or equal to 99.99%) and a KPA stabilizer, so that the degradation rate of betacyanin is less than or equal to 10%. Finally, the stability is improved through ceramic membrane filtration, cold stabilization and pasteurization, and the product is purplish red in color and luster and complex in flavor and has industrial application potential.

The invention discloses a formaldehyde-free composite board for a cabinet and a preparation method of the formaldehyde-free composite board, and relates to the technical field of artificial board manufacturing. The preparation method of the formaldehyde-free composite board for the cabinet comprises the following steps: mixing high amylose with a choline chloride / urea deep eutectic solution, stirring, adding concentrated hydrochloric acid for reaction, adjusting the pH value, and adding ammonium persulfate to obtain pretreated oxidized starch; methacrylic acid dehydrated glyceride is added into the pretreated oxidized starch for a grafting reaction, then modified polyvinyl alcohol is added for blending, sodium metaphosphate is added for crosslinking, finally, heating and curing are conducted, modified titanium dioxide nanoparticles are added, and the formaldehyde-free starch adhesive is obtained. The wood shavings and the formaldehyde-free starch adhesive are mixed, and a core material is obtained; and arranging the core material between the formaldehyde-free veneers, and carrying out hot press molding to obtain the formaldehyde-free composite board. The formaldehyde-free composite board for the cabinet has excellent mechanical strength, bonding performance and water resistance.

The invention provides a beneficiation method for low-grade fluorite ore containing magnesium carbonate, and belongs to the technical field of fluorite beneficiation. According to the method, the fluorite raw ore is subjected to classification and waste pre-discarding treatment, and pre-enriched minerals are obtained; the pre-enriched minerals are subjected to ore grinding treatment, and first ore pulp is prepared after water is added; carrying out flotation operation on the first ore pulp by adopting a flotation reagent; the flotation reagent comprises a compound inhibitor and a compound regulator, the compound inhibitor comprises aluminum sulfate, sodium hexametaphosphate, tannic acid, citric acid and sodium alginate, and the compound regulator comprises calcium lignosulphonate, hydroxyethyl cellulose and potassium dichromate. Through the mode, the beneficiation method for the magnesium-containing carbonate type low-grade fluorite ore can utilize the synergistic effect between the specific beneficiation technological process and the improved reagent system, acid leaching operation is omitted, meanwhile, the recovery rate and grade of fluorite are improved through the simpler process and the lower reagent cost, and the beneficiation efficiency is improved. And the method has an extremely high industrial application prospect.

The invention discloses large-temperature-difference low-density well cementation cement slurry for an ultra-deep well and a preparation method of the large-temperature-difference low-density well cementation cement slurry. The preparation method comprises the following steps: preparing a phosphoric acid solution from a 60% HEDP solution, sodium hexametaphosphate and water according to the ratio of 6: 3: 41; preparing a 10% zinc nitrate aqueous solution; the preparation method comprises the following steps: uniformly dry-mixing 450 parts of oil well G-grade cement, 120 parts of silicon powder, 100-85 parts of low-density light material and 120-80 parts of active strength enhancer to obtain dry-mixed aggregate; the method comprises the following steps: dissolving 22-15 parts of a high-temperature fluid loss agent G33S in 435-340 parts of tap water to obtain an aqueous solution of the high-temperature fluid loss agent; uniformly mixing an aqueous solution of a fluid loss agent with the dry-mixed aggregate to obtain mixed cement paste; 4.8-14 parts of a zinc nitrate aqueous solution is taken and poured into the cement paste mixed slurry to be mixed, then 9-35 parts of the hydrolyzed phosphoric acid solution is poured into the cement paste mixed slurry to be mixed evenly, and the cement paste is obtained. The cement paste can play a role in retarding at the high temperature of the well bottom and can prevent gas channeling at the low temperature of the top.

The invention relates to the technical field of water quality purification treatment, in particular to a water quality purifying agent for aquaculture and a preparation method. The water quality purifying agent is prepared from potassium peroxymonosulfate composite salt, citric acid, humic acid, sodium carbonate, magnesium carbonate, sodium hexametaphosphate, probiotics, polyethylene glycol, anhydrous sodium sulphate, a composite plant cell additive, plant active ingredients and water. According to the water quality purifying agent disclosed by the invention, various effective components are scientifically compounded, so that the water quality purifying effect of the water quality purifying agent is more outstanding, and the compound plant cell additive is specially added, so that the metal trapping agent is limited and fixed in pores, and gelated plant active cells are wrapped; the water quality purifying agent has the advantages that secondary pollution to a water body after metal ions are adsorbed and chelated is avoided, and damage to plant active cells caused by microorganisms and phosphate is also avoided, so that the water quality purifying agent is more stable, the efficacy time is prolonged, and good economic benefits are achieved.

The invention discloses a method and system for preparing nano barium sulfate uniform particles based on ultrasonic assistance, and the method comprises the steps: conveying a sodium sulfate solution and a barium chloride solution into a reaction container in an isopyknic manner, adjusting the position and parameters of an ultrasonic transducer, and adjusting the power and frequency according to a preset curve; slowly transferring the slurry obtained by the reaction into a post-treatment container, adding a sodium hexametaphosphate solution, and carrying out dispersion treatment in an ultrasonic cleaning device; and subpackaging the product into a sealed container subjected to cleaning treatment in a continuous flowing manner, controlling the filling amount, and sealing for constant-temperature storage. According to the scheme of the invention, nano barium sulfate particles with small particle size and uniform distribution can be generated.

The invention relates to the technical field of starch, and discloses a preparation method of hydroxypropyl distarch phosphate, which comprises the following steps: adding deionized water, sodium sulfate and sodium hydroxide into a reaction kettle, stirring, adding starch, introducing nitrogen, adding epoxypropane, and carrying out etherification reaction; and then adding sodium trimetaphosphate and a catalyst molecular sieve loaded calcium chloride, and carrying out a cross-linking reaction to obtain the hydroxypropyl distarch phosphate. The molecular sieve loaded calcium chloride catalyst can more effectively catalyze a phosphate cross-linking reaction of etherified starch and sodium trimetaphosphate, the obtained hydroxy propyl distarch phosphate has the advantages of low sedimentation volume and large cross-linking degree, and the cross-linked starch can still keep a complete particle form after being subjected to high-temperature gelatinization treatment, so that the cross-linked starch has good stability. And after high-speed shearing, the viscosity and viscosity reduction amplitude are relatively small, and the viscosity retention rate and the anti-shearing performance are very good.

The invention discloses a method for extracting DNA from marine sediments, and belongs to the technical field of DNA extraction. The method comprises the following steps: adding sodium hexametaphosphate and a cell lysis solution into the marine sediment, uniformly mixing, incubating and centrifuging to obtain supernate; adding a chloroform-isoamyl alcohol mixed solution into the supernate, uniformly mixing, centrifuging, and removing an organic phase to obtain a water phase; and adding linear polyacrylamide and sodium chloride into the water phase, uniformly mixing, adding ethanol, precipitating in a dark place, and centrifuging to obtain the DNA extract. Compared with the prior art, the method provided by the invention has the advantages that the DNA in the marine sediment can be effectively extracted, the extraction amount is high, the concentration is high, and the obtained DNA can better meet the metagenome sequencing requirement and the subsequent PCR reaction requirement.

The invention discloses a fluoride-free strong-acid-free reverse flotation method for extracting a high-purity quartz sand flotation product from granite pegmatite, and belongs to the technical field of mineral flotation. The method comprises the following steps: carrying out graded crushing and ore grinding on granite pegmatite to obtain slurry to be treated; carrying out wet magnetic separation on the to-be-treated slurry to obtain ore pulp after magnetic separation and magnetic-containing minerals; the pH value of the ore pulp is not adjusted, reverse flotation is carried out in the presence of a quartz mixed inhibitor, and a feldspar product and a quartz product are obtained; the quartz mixed inhibitor is a combination of a component A and a component B, wherein the component A is selected from at least one of sodium metasilicate, sodium tripolyphosphate, sodium hexametaphosphate, carboxymethyl cellulose and salinized water glass; the component B is selected from at least one of guar gum, Arabic gum, sodium humate and citric acid. The method is free of fluorine and strong acid, green and efficient, and is a method for preparing high-purity quartz sand from pegmatite with high industrial application feasibility.

The invention relates to a flow battery electrolyte and an application thereof. The flow battery electrolyte comprises vanadium ions, a supporting electrolyte and an additive, the additive is selected from one, two or more of ammonium sulfate, ammonium phosphate, potassium phosphate, sodium metaphosphate, diammonium hydrogen phosphate and hydrogen peroxide. According to the vanadium battery electrolyte provided by one embodiment of the invention, the specific additive is added, so that vanadium ions can be in a liquid state or a microemulsion state, separation or precipitation of the vanadium ions is prevented, and the efficiency of the battery is remarkably improved.

The invention relates to the technical field of etching solutions, and discloses a molybdenum-aluminum-niobium etching solution for a TFT-LCD (Thin Film Transistor Liquid Crystal Display), which comprises the following components in percentage by mass: 50 to 60 percent of phosphoric acid, 3 to 8 percent of nitric acid, 5 to 10 percent of glacial acetic acid, 1 to 5 percent of aluminum nitrate, 0.1 to 0.5 percent of diphenyl thiourea, 1 to 5 percent of etidronic acid, 3.0 to 5.0 percent of sodium hexametaphosphate, 0.1 to 0.2 percent of fatty alcohol-polyoxyethylene ether, 0.5 to 0.8 percent of amino trimethylene phosphonic acid and the balance of ultrapure water. The invention further discloses a preparation method of the molybdenum-aluminum-niobium etching solution. According to the invention, a phosphorus nitrate vinegar system, a composite additive, a novel corrosion inhibitor, a metal ion chelating agent and a surfactant matched with the etching liquid are adopted, so that the molybdenum-aluminum-niobium multi-layer composite metal film can be simultaneously etched at one time; the etching solution has the advantages of being uniform in etching, capable of inhibiting Mo / Nb etching, high in selectivity, controllable in etching rate, free of residues, long in service life, high in stability and the like.

The invention relates to the technical field of ceramic diaphragms, and particularly discloses a ceramic diaphragm for separating waste lubricating oil and a preparation method of the ceramic diaphragm. The preparation method of the ceramic diaphragm for separating the waste lubricating oil comprises the following steps: preparing pretreated fibroin nanofibers; mixing the pretreated silk protein nanofiber and hydroxyapatite powder, stirring, adding water, gelatin and sodium hexametaphosphate, carrying out ball milling, pouring into a mold, freeze-drying, sintering, cooling, and polishing the surface to obtain a ceramic base material; the preparation method comprises the following steps: calcining diatomite, cooling, adding absolute ethyl alcohol and water, stirring, adding triethylamine, stirring in a constant-temperature water bath, filtering, washing and drying to obtain pretreated diatomite; and mixing water, gamma-aminopropyltriethoxysilane and polyethylene glycol, stirring, adding the pretreated diatomite, stirring, immersing the ceramic base material, drying, and curing to obtain the ceramic diaphragm for separating the waste lubricating oil. According to the ceramic diaphragm for separating the waste lubricating oil, the membrane flux can keep self-adaptive constant-speed stability in a reasonable interval.

The invention discloses an inhibitor for relieving cement false setting as well as a preparation method and application thereof. The inhibitor comprises the following components in parts by weight: 5-10 parts of a retarding component, 0.5-3 parts of a surface active component and 87-94 parts of a metal impurity component, the retarding component is selected from one or more of sodium tripolyphosphate, sodium hexametaphosphate, hydroxyethylidene diphosphonic acid, amino trimethyl phosphonic acid, ethylenediamine tetra (methylene phosphonic acid), pentasodium diethylene triamine penta (methylene phosphonic acid) and 2-phosphonobutane-1, 2, 4-tricarboxylic acid; the metal impurity component is monovalent or divalent metal sulfate. The inhibitor can effectively relieve / solve the problems that the flowing property of fresh concrete becomes poor and the viscosity is sharply increased due to cement false setting, the working performance of the concrete is kept stable, and it is guaranteed that the concrete is easy to construct.

The invention relates to the technical field of chemical mechanical polishing solutions, in particular to a chemical mechanical polishing solution for silicon carbide and a preparation method thereof, the polishing solution comprises a catalyst, abrasive particles, a dispersing agent, an oxidizing agent, a surfactant, an acid-base regulator and deionized water; the catalyst is nano platinum particles; the abrasive particles are aluminum oxide; the dispersing agent is at least one of sodium polyacrylate, sodium hexametaphosphate, hexadecyl trimethyl ammonium bromide and the like. The oxidizing agent is at least one of permanganate, pypocholoride, dichromate and the like; the surfactant is at least one of sodium dodecyl benzene sulfonate, organic bentonite and the like; the pH regulator is at least one of phosphoric acid, nitric acid, oxalic acid and citric acid. The polishing solution can effectively improve the removal rate of silicon carbide, and meanwhile, a polished silicon carbide wafer is high in flatness and free of scratches.

The application discloses a layered silicate gangue inhibitor for fine-grained copper ore flotation and a preparation method thereof. The inhibitor is composed of the following components: modified polysaccharide organic polymer 15-30%, sodium hexametaphosphate 10-30%, acrylic acid 7-15%, acrylamide 1-5%, ammonium persulfate 2-5%, hydroxyethylidene diphosphonic acid 5-15%, aluminum sulfate 2-5%, and deionized water in a residual amount. The preparation method comprises the following steps: mixing modified polysaccharide and deionized water according to a mass ratio of 1:1-1:2 to prepare solution A; polymerizing acrylic acid and acrylamide to prepare solution B; mixing solution A and solution B, and adding a formula amount of sodium hexametaphosphate to react; then adding a formula amount of hydroxyethylidene diphosphonic acid and a formula amount of aluminum sulfate to carry out complex adjustment; and finally, aging, filtering and obtaining the product. The inhibitor has a strong selective inhibiting effect on talc, phlogopite and other layered silicate gangues, can significantly improve the copper concentrate grade and recovery rate, has a small dosage, is non-toxic and environment-friendly, and can be biodegraded.

The invention relates to the technical field of fertilizers, and discloses a treatment method for preventing caking of a fertilizer, which comprises the following steps: firstly, coating the fertilizer with a polymer coating film to form the polymer coating film which can effectively prevent the fertilizer from absorbing moisture and reduce the possibility of moisture absorption of particles, so that the caking resistance of the fertilizer particles is effectively improved; in addition, the used humic acid and glucan are biodegradable high-molecular substances and can achieve a certain improvement effect on soil to a certain extent, secondly, the added anti-caking agent can reduce adhesion and caking among particles caused by moisture by reducing direct contact among the particles, absorbing a small amount of moisture and the like, and the soil conditioner has the advantages that the soil conditioner has a good anti-caking effect. The effect of preventing caking can be achieved by reducing the capillary adsorption capacity of moisture to the particles, and the sodium hexametaphosphate can play a good positive role in dispersing the particles, so that the agglomeration and caking phenomena among the fertilizer particles are reduced.

Provided according to an embodiment of the present invention is a liquid composition for tooth whitening, which comprises sodium metaphosphate and sodium fluoride (NaF), and has a pH of 4 to 6. The liquid composition for tooth whitening according to the present invention can provide excellent whitening effects while reducing oral irritation.

The invention provides a chlorine-containing disinfectant and a preparation method thereof, and belongs to the technical field of disinfectants. The disinfectant is prepared from bromochlorohydantoin, sodium dichloroisocyanurate, rosmarinic acid, octenidine, sodium hexametaphosphate, polyhexamethylene biguanidine hydrochloride, potassium monopersulfate, potassium chloride, dialkyl dimethyl ammonium chloride, laurocapram, squalane, carvacrol and benzalkonium chloride. The composition formula is constructed by taking bromochlorohydantoin and sodium dichloroisocyanurate as core components, the potassium monopersulfate has an efficient and broad-spectrum microbial inactivation effect, the squalane is originally used for moistening, moisturizing, resisting oxidation, regulating grease secretion and the like, and the potassium chloride has a broad-spectrum bactericidal effect, and is non-toxic and residue-free; after the components are compounded, a more prominent killing effect is shown. The disinfectant has a good surface sterilization effect, the killing rate reaches 99.999%, and the killing rate on spores and amoeba cysts also reaches 98% or above.