133 results about "Pyrophosphate sodium" patented technology

The invention relates to an emulsifier composition for meat products as well as a preparation method and application of the emulsifier composition. The emulsifier composition disclosed by the invention is prepared from the following components in parts by weight: 5 to 10 parts of sodium caseinate, 0 to 5 parts of sucrose fatty acid ester, 10 to 15 parts of collagen, 5 to 10 parts of glutamine transaminase, 60 to 70 parts of maltodextrin, 0 to 5 parts of sodium pyrophosphate and 0 to 5 parts of trisodium phosphate. The invention relates to a meat product containing the emulsifier composition, wherein the amount of the emulsifier composition accounts for 0.6%-1% of the total weight of the meat product. According to the invention, the obvious compounding effect among the monomer emulsifier, collagen, phosphate and glutamine transaminase is fully utilized, the functional complementation principle of various raw materials is exerted, and the synergistic interaction effect is generated. On the basis of enhancing the taste of the meat product, the oil and water retention property is improved to a greater extent, so that the yield is improved, and the production cost is reduced.

The invention discloses a high-reflection magnesium phosphate / aluminum phosphate radiation refrigeration material and a preparation method thereof, and relates to the technical field of radiation refrigeration materials. The preparation method of the high-reflection magnesium phosphate / aluminum phosphate radiation refrigeration material comprises the following steps: (1) mixing aluminum sec-butoxide and deionized water to prepare a solution A; mgCl2. 6H2O and deionized water are mixed to prepare a solution B; mixing the solution A and the solution B to obtain a solution C; (2) adding 3-sulfopropyl tetradecyl dimethyl betaine into the solution C to obtain a solution D; (3) stirring sodium pyrophosphate and deionized water into a solution E; mixing the solution E and the solution D to obtain a solution F; and (4) reacting the solution F at 150-180 DEG C, cooling, freeze-drying and grinding to obtain H, heating H to 300-400 DEG C at the rate of 3-4 DEG C / min, then heating H to 800-1300 DEG C at the rate of 7-10 DEG C / min, and keeping the temperature for 1-3 hours to obtain the product. The material prepared by the invention has excellent sunlight reflectivity and excellent mid-infrared emissivity, and shows excellent performance in the field of radiation refrigeration.

The invention relates to the technical field of material processing, in particular to a coating method of a pearlescent pigment base material. According to the technical scheme, the preparation method comprises the following steps: dropwise adding a water-soluble ferric salt solution into an acidified amine precipitant aqueous solution, reacting to obtain a precursor solution of ferric oxide, putting an inorganic salt additive and flaky alpha-Al2O3 powder into the precursor solution of ferric oxide, carrying out hydrothermal reaction, and cleaning and drying the precipitate after reaction, the flaky alumina-based pearlescent pigment with a good pearlescent effect is obtained. The preparation method has the beneficial effects that an aqueous solution of an amine precipitator and an iron salt solution react to obtain a precursor solution of iron oxide, the surface of alpha-Al2O3 can be coated with alpha-Fe2O3 only through hydrothermal reaction without high-temperature sintering, and sodium polyphosphate salts such as sodium hexametaphosphate, sodium tripolyphosphate and sodium pyrophosphate are introduced as additives; the coating rate of ferric oxide can be improved within a certain range, the preparation efficiency of the pearlescent pigment taking alpha-Al2O3 as the substrate is effectively improved, and the production cost is reduced.

The invention relates to a sodium ferric fluorophosphate pyrophosphate positive electrode material as well as a preparation method and application thereof, belongs to the technical field of sodium ion batteries, and solves the problems of high fluorine content, high toxicity and poor cycle performance of sodium ferric fluorophosphate pyrophosphate in the prior art. The molecular formula of the sodium ferric fluorophosphate pyrophosphate positive electrode material is Na (3-2y + x) Fe2-y (PO4) (P2O7) (1-y) F (x) (at) C, the value range of y is more than or equal to 0 and less than 1.0, and the value range of x is more than 0 and less than or equal to 1.0. The sodium ferric fluorophosphate pyrophosphate positive electrode material disclosed by the invention has relatively high compaction density, relatively high gram volume and good cycle performance.

The invention discloses a high-entropy ferric pyrophosphate sodium ion battery positive electrode material and a preparation method thereof, and belongs to the field of battery positive electrode materials. The chemical formula of the positive electrode material is Na4Fe3-aMa (PO4) 2P2O7 (0.05 < = a < = 0.5), M is a metal element and comprises at least five of cobalt, magnesium, zirconium, zinc, aluminum, molybdenum, copper, manganese, nickel, calcium and chromium, the high-entropy ferric sodium phosphate pyrophosphate battery positive electrode material is spherical, and the surface of the high-entropy ferric sodium phosphate pyrophosphate battery positive electrode material is coated with an amorphous carbon layer. The preparation method adopts a sol-gel method and comprises the following steps: mixing an iron source, a doped metal source, sodium pyrophosphate, ammonium dihydrogen phosphate and citric acid monohydrate according to a stoichiometric ratio, stirring, gelatinizing and drying to obtain xerogel, and calcining through a two-stage hydrogen-argon mixed gas to obtain the iron-doped metal-doped sodium pyrophosphate / citric acid composite material. The crystal structure is optimized by means of the high-entropy synergistic effect, the electron conductivity and the Na < + > diffusion rate are improved, and the industrial adaptability of the spherical morphology and the structural stability of carbon coating are combined.

The invention relates to the technical field of blast furnace iron making, and particularly discloses a blast furnace composite stemming and a preparation method thereof.The blast furnace stemming is prepared from, by mass, aggregate including (43-X1-X2-X3)% of brown fused alumina, 13% of coke, (16-B)% of SiC, B% of clay, 4.5% of sericite, 7% of kyanite, 7.5% of silicon carbide iron, 4% of ball pitch, 5% of iron area waste mixture, 1% of iron oxide scale Fe3O4 X, 2% of cubic boron nitride c-BN X and 3% of graphene oxide GO X; comprising the following components in percentage by weight: 13-C% of tar, C% of asphalt and 2% of sodium pyrophosphate Na4P2O7; according to the method, stemming softening caused by excessive use of the oxide scale when the cold air pressure is low is prevented, the problems of incomplete internal structure and insufficient strength development of stemming caused by insufficient heat are avoided, excessive use of nanoscale materials is avoided, and the material cost is reduced.

The application discloses a preparation method of sodium iron pyrophosphate phosphate and application thereof in sodium ion batteries, and belongs to the technical field of battery material preparation. The preparation method of the battery positive electrode material sodium iron pyrophosphate phosphate Na4Fe3(PO4)2P2O7 is as follows: sodium pyrophosphate, iron phosphate dihydrate and iron powder are dry-mixed in proportion to obtain a precursor, the precursor is heated by microwaves to 440-460 DEG C for insulation for a certain time, and sodium iron pyrophosphate phosphate is synthesized. According to the characteristics of the target product, the phase transformation of phosphate and pyrophosphate in the sintering process, the metering ratio, the reduction of trivalent iron into divalent iron and the like, a new synthesis mode is designed, including the reselection of raw materials and the redesign of the sintering mode. The sodium iron pyrophosphate phosphate material is synthesized accurately, efficiently and at low cost through solid-phase mixing and then microwave heating, the low-cost synthesis process problem of the sodium iron pyrophosphate phosphate positive electrode of the sodium ion battery is solved, and the application prospect of the method is very wide in industrial production.

The invention discloses a solid windshield washer fluid and a preparation method thereof, the solid windshield washer fluid comprises the following raw materials by weight: 45-55 parts of an acid source, 25-40 parts of sodium carbonate, 9-10 parts of a surfactant, 2.5-3.5 parts of a corrosion inhibitor, 1.5-2.5 parts of an antifoaming agent, and 3.5-4 parts of a builder; the washing assistant comprises sodium pyrophosphate, and the washing assistant further comprises one or more of hydroxypropyl methylcellulose and sodium stearyl fumarate. The preparation method of the solid windshield washer fluid comprises three steps of mixing, tabletting and slicing. The solid windshield washer fluid provided by the invention can achieve the effects of being good in cleaning effect, excellent in spreading performance and capable of protecting a windscreen wiper.

The present application relates to the field of food processing, and particularly relates to a preparation method of quinoa and red date yoghurt. The method comprises the following steps: quinoa is soaked, ground, and treated by gradient temperature enzyme inactivation, and then mixed with red date pulp at a volume ratio of 1:1, and then treated by alpha-amylase liquefaction, saccharifying enzyme and pullulanase compound saccharification, and low-oxygen flavor pre-hybridization, and then mixed with reconstituted milk and compound stabilizer konjac glucomannan and sodium pyrophosphate, and then sterilized, cooled, inoculated with starter culture, and then fermented and ripened to obtain the product. The present application eliminates the peculiar smell of quinoa by gradient enzyme inactivation, and saccharifying enzyme and pullulanase have a significant synergistic effect in the quinoa and red date yoghurt system, and the secondary enzymolysis of liquefaction and saccharification significantly improves the starch utilization rate, and the compounding of konjac glucomannan and sodium pyrophosphate significantly improves the product texture, and the present application solves the technical problems of low starch utilization rate, obvious peculiar smell, poor water holding capacity, and low viable count of traditional quinoa yoghurt.

The invention discloses a method for sequentially extracting forms of heavy metals in an organic fertilizer, which comprises the following steps: (1) mixing the organic fertilizer with a magnesium chloride solution, and separating to obtain a first filtrate and a first residue; (2) mixing and separating the first residue and an acetic acid-sodium acetate buffer solution to obtain a second filtrate and a second residue; (3) mixing and separating the second residue and a sodium pyrophosphate solution to obtain a third filtrate and a third residue; (4) mixing and separating the third residue and the hydrogen peroxide and nitric acid solution, and mixing and separating the obtained residue and an ammonium acetate solution to obtain a fourth filtrate and a fourth residue; (5) mixing and separating the fourth residue and a hydroxylamine hydrochloride solution to obtain a fifth filtrate and a fifth residue; (6) mixing the fifth residue with aqua regia, and filtering to obtain a sixth filtrate; (7) mixing the organic fertilizer with aqua regia, and filtering to obtain a seventh filtrate; and (8) detecting the contents of heavy metal elements in the first filtrate, the second filtrate, the third filtrate, the fourth filtrate, the fifth filtrate, the sixth filtrate and the seventh filtrate.

The invention relates to whitening toothpaste capable of reducing pigment adhesion as well as a preparation method and application of the whitening toothpaste. The whitening toothpaste comprises hydrated silica, a PVM / MA copolymer, sodium phytate, tetrasodium pyrophosphate, hydroxyapatite and polyethylene glycol. The hydrated silica, the PVM / MA copolymer, the sodium phytate, the tetrasodium pyrophosphate, the hydroxyapatite and the polyethylene glycol have a synergistic effect, the effects of whitening, removing stains and removing exogenous stains can be achieved, and the tooth whitening degree is improved from the inside and the outside.

The invention discloses a molded pulp wire coil material and a preparation method thereof, and relates to the technical field of wire coil materials. The raw materials of the environment-friendly and environment-friendly material comprise the following components: 50%-85% of a waste raw material, 5%-20% of epoxy resin, 0.2%-2% of hydrogen peroxide, 0.5%-1% of ozone, 1%-3% of sodium pyrophosphate, 2%-5% of a degradable adsorption material, 1%-3% of super absorbent resin, 0.5%-1% of a sodium chloride solution, 0.5%-1% of a calcium chloride solution, 0.1%-0.5% of a bleaching agent and 0.5%-1% of an antioxidant. According to the paper pulp molding wire coil material and the preparation method thereof, the original color of the wire coil material can be guaranteed, meanwhile, the color protection effect can be achieved when the wire coil material is prepared, harmful substances existing in the wire coil material are reduced, the environmental protection performance of the wire coil material is improved, the water locking strength of the wire coil material is reduced, and the water removal rate can be increased under the condition of heat with the same energy consumption.

The invention provides a polyanionic positive electrode material as well as a preparation method and application thereof. The polyanionic positive electrode material comprises a core particle and a carbon coating layer coating the core particle, the core particle comprises Mn and Mg co-doped iron-based sodium pyrophosphate; the carbon coating layer comprises amorphous carbon and graphitized carbon. According to the invention, the double-doped Mn and Mg can achieve a synergistic effect, Mn doping is beneficial for increasing the average working voltage, Mg can be used as a lattice stabilizer to be beneficial for inhibiting distortion caused by Mn doping, and the structural stability is improved while the capacity is increased; the carbon coating layer contains amorphous carbon and graphitized carbon, so that filling of pores and interface gaps in the manganese and magnesium synergistically doped iron-based sodium pyrophosphate is facilitated. In a word, through the combination of the synergistic doping of manganese and magnesium and specific carbon coating, the gram capacity, the compaction density and the energy density of the material can be effectively improved, and the material is suitable for a high-power sodium ion battery.

The invention relates to the technical field of leavening agents, and discloses a food composite leavening agent, which comprises the following components by mass: 25-30 parts of ammonium bicarbonate; 15 to 23 parts of microencapsulated ammonium citrate; 8 to 16 parts of sodium pyrophosphate; 5 to 9.5 parts of L-potassium hydrogen tartrate; 13 to 17 parts of trehalose; 0.5 to 1.3 parts of surface modified nano silicon dioxide; and 10 to 17 parts of hydroxypropylated cassava starch. The microencapsulated ammonium citrate is formed by coating beta-cyclodextrin, and the thickness of an embedding layer is 16-20 [mu] m. The multi-layer microcapsule structure is constructed by carrying out gradient embedding on ammonium citrate through beta-cyclodextrin, so that staged release of gas production substances is realized. According to the structure, different temperature intervals are accurately matched in the baking process, it is guaranteed that the gas production rate is synchronous with the dough expansion requirement, and the problem of excessive expansion or insufficient gas production caused by concentrated release in the traditional technology is solved.

The present invention provides a production method of instant sodium pyrophosphate, comprising the steps of neutralization, spray drying, polymerization, pre-hydration, cooling, and screening to obtain instant sodium pyrophosphate. Food phosphoric acid and soda ash are neutralized to obtain disodium hydrogen phosphate slurry, controlling the pH to 8.8-9.2 and the specific gravity to 1.4-1.5 g / ml; the neutralized slurry is transported to a pressure spray drying tower, and the tower bottom temperature is controlled to 120°C to 150°C; after drying, it enters a dynamic polymerization furnace, with a polymerization time of 30-40 min and a furnace tail temperature of 180°C to 210°C to obtain a semi-finished sodium pyrophosphate product. The semi-finished product passes through a cooling drum, and water mist is sprayed at the drum entrance for pre-hydration and cooling at the same time; the product is sieved to obtain instant sodium pyrophosphate.

The invention discloses a high-stability liquid silicon fertilizer based on fulvic acid chelation and a preparation method thereof, and relates to the field of agricultural chemistry, the preparation method comprises the following steps: S1, dissolving a silicon source in deionized water at 55-65 DEG C, stirring and dissolving to prepare a silicon source solution; s2, dissolving fulvic acid in deionized water at 45-55 DEG C, stirring and dissolving, and adding an activating agent for activating treatment to obtain an activated fulvic acid solution; the activating agent is sodium pyrophosphate or sodium tripolyphosphate, and the adding amount of the activating agent is 1-3% of the mass of the fulvic acid dry basis; according to the high-stability liquid silicon fertilizer based on fulvic acid chelation and the preparation method of the high-stability liquid silicon fertilizer, the problems of poor stability, low absorption and utilization rate and poor compatibility of the liquid silicon fertilizer are synergistically solved through an activation-directional chelation process and a composite stabilization technology, firstly, sodium pyrophosphate is introduced as an activating agent, inert metal ions in fulvic acid are dissociated in advance, and then the fulvic acid is added into the activating agent to prepare the high-stability liquid silicon fertilizer based on fulvic acid chelation; active sites such as carboxyl and phenolic hydroxyl are fully activated.

The invention discloses a zinc oxide production tail gas purification method based on alkali liquor spraying, and belongs to the field of tail gas purification. The method comprises the following steps: mixing sodium salt, an activating agent, an auxiliary agent and deionized water to prepare alkali liquor, intercepting tail gas through a grid, pretreating the tail gas through a cyclone separator, introducing the tail gas into a spraying device for reaction, demisting, drying, and discharging after the tail gas reaches the standard through detection. The molecular chain of the modified lignin contains amino groups and can neutralize acidic gas; sodium pyrophosphate locks heavy metal ions through coordination, and can maintain a stable weak base environment of the system. According to the method, a weak base system is adopted, the method is more environmentally friendly and weak in corrosivity, all components and reaction products are good in water solubility, equipment blockage is avoided, and synchronous removal of multiple pollutants is achieved.

The application discloses a combined depressor for recovering scheelite from ultra-low-grade tungsten-molybdenum associated ore and a method, the combined depressor comprising sodium humate, sodium mercaptoacetate, ammonium citrate, sodium pyrophosphate, sodium fluosilicate and lead nitrate, and the six kinds of substances are configured into the combined depressor in a proportion of 1:1:(2-5):(1-5):(1-3):(2-5). The application aims at recovering scheelite from low-grade refractory ore, improves the separation effect of scheelite and gangue minerals, improves the scheelite recovery rate and the concentrate grade, and improves the economic benefit.

The invention relates to anti-caries toothpaste capable of freshening breath and a preparation method of the anti-caries toothpaste. The anti-caries toothpaste comprises disodium dihydrogen pyrophosphate, zinc citrate, a grape seed extract, tetrasodium pyrophosphate, sodium fluoride and synthetic fluorophlogopite. The disodium dihydrogen pyrophosphate, the zinc citrate, the grape seed extract, the tetrasodium pyrophosphate, the sodium fluoride and the synthetic fluorophlogopite are combined, so that a synergistic interaction effect is achieved, decayed teeth can be prevented and treated, and fresh breath is remarkably improved.

The invention discloses a micro-arc oxidation film layer on the surface of a magnesium or magnesium-lithium alloy foil and a preparation method of the micro-arc oxidation film layer, and belongs to the technical field of surface engineering. The preparation method comprises the following steps: immersing the magnesium or magnesium-lithium alloy foil into an electrolyte, carrying out micro-arc oxidation treatment by taking the magnesium or magnesium-lithium alloy foil as an anode and a stainless steel plate as a cathode, and generating a compact micro-arc oxidation film layer with a three-layer structure on the surface of the magnesium or magnesium-lithium alloy foil in situ; the electrolyte comprises the following components: 8-12 g / L of sodium pyrophosphate, 2-6 g / L of sodium silicate, 1-3 g / L of a pH regulator, 2-6 g / L of sodium fluoride and the balance of deionized water; the three-layer structure sequentially comprises a loose layer, a compact layer and a transition layer from outside to inside. According to the preparation method, the corrosion resistance and the mechanical property of the oxidation film layer are improved.

The application relates to a fluorophosphoferric pyrophosphate sodium positive electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion batteries. The fluorophosphoferric pyrophosphate sodium positive electrode material solves the problems of excessive fluorine content, excessive toxicity and poor cycle performance of fluorophosphoferric pyrophosphate sodium in the prior art. The molecular formula of the fluorophosphoferric pyrophosphate sodium positive electrode material is Na (3‑2y+x) Fe 2‑y (PO4)(P2O7) (1‑y) F (x) @C, wherein the value range of y is 0<=y<1.0, and the value range of x is 0 The fluorophosphoferric pyrophosphate sodium positive electrode material has high compaction density and high gram capacity, and good cycle performance.

The application discloses an anti-sintering methanol cracking catalyst and a preparation method thereof, and belongs to the field of hydrogen production by methanol cracking catalysis. The anti-sintering methanol cracking catalyst comprises the following raw materials in parts by weight: strontium nitrate 1.8-3 parts, titanium nitrate 6.3-10.5 parts, a Cu active carrier 58-70 parts and polyvinyl alcohol 2-5 parts. The Cu active carrier comprises the following raw materials in parts by weight: copper acetate 12-21 parts and a Zr-HAP-P2O7 carrier 51-60 parts. The Zr-HAP-P2O7 carrier comprises the following raw materials in mole fractions: calcium nitrate 19-22 parts, zirconium nitrate 1.8-2.5 parts, ammonium dihydrogen phosphate 18 parts and sodium pyrophosphate 1.4-1.7 parts. The methanol cracking catalyst provided by the application has strong anti-sintering capacity, can effectively prevent the generation of carbon deposition and prolong the service life of the catalyst.

The invention relates to the technical field of cleaning agent production, in particular to a production process and production equipment of a high-performance cleaning agent for copper materials. The cleaning agent is prepared from the following components in percentage by weight: 5.7 to 10.99 percent of sulfamic acid, 15 to 25 percent of organic carboxylic acid compounded by citric acid and tartaric acid, 1.03 to 14.05 percent of ethanol, 0.58 to 1.28 percent of lauryl sodium sulfate, 1.19 percent of benzotriazole, 10.15 to 14.89 percent of sodium pyrophosphate, 3 to 5 percent of fatty alcohol-polyoxyethylene ether, 2 to 4 percent of EDTA (Ethylene Diamine Tetraacetic Acid) disodium and the balance of deionized water. The cleaning agent has the decontamination ability of an amino acid system and the environmental protection property of an organic acid system, is not easy to over-corrode, and solves the problem of high component decomposition rate in a key reaction stage through precise temperature control.

The invention relates to a fluorescence and colorimetric dual-mode biosensing method for detecting caffeine and application thereof, the method causes CRISPR / Cas13a to regulate and control Fe-MOFs to fall off from a signal probe based on to-be-detected liquids with different concentration gradients, the fallen Fe-MOFs collapses under the action of sodium pyrophosphate to release 2-aminoterephthalic acid and ferric ions, and the 2-aminoterephthalic acid and ferric ions are subjected to fluorescence and colorimetric dual-mode biosensing method is used for detecting caffeine. 2-aminoterephthalic acid is converted into a fluorescence signal, meanwhile, Prussian blue generated by reaction of ferric ions and potassium ferrocyanide is converted into a colorimetric signal, and a fluorescence and colorimetric dual-mode biosensing method is constructed; according to the sensor, interference factors can be effectively eliminated by outputting two detection signals and performing cross validation; the advantages of high sensitivity and wide linear range of a fluorescence method and the advantages of simple operation and visual result of a colorimetric method are combined, so that a target object can be accurately recognized, the lower detection limit can be reduced, and the accuracy of a quantitative result can be ensured; according to the sensing method, visual observation can be achieved, precise instruments are not needed, and good application value is achieved.

The invention belongs to the technical field of disinfectants, and particularly relates to a sodium trichloroisocyanurate effervescent tablet disinfectant which comprises the following raw materials in parts by weight: 50-70 parts of sodium trichloroisocyanurate, 20-30 parts of a composite effervescing agent, 3-8 parts of a composite stabilizer, 1-5 parts of a surfactant, 2-6 parts of a filler and 0.5-2 parts of an odor inhibitor. According to the invention, the composite stabilizer is adopted, and disodium ethylene diamine tetraacetate can chelate metal ions in the raw materials, so that the metal ions are prevented from catalyzing the decomposition of sodium trichloroisocyanurate; sodium pyrophosphate can adjust the pH value of the system and maintain a stable chemical environment; sodium sulfite can inhibit oxidation reaction, the effective chlorine loss rate is effectively reduced through the synergistic effect of sodium sulfite, sodium sulfite and the disinfectant, the disinfectant is stored for 12 months under the conditions that the temperature is 30 DEG C and the relative humidity is 60%, the effective chlorine loss rate is only 3%-5% and is far lower than the loss rate of 15%-20% of an existing product, step-by-step mixing and inert gas shielding are adopted in the preparation method, and the cost is low. The raw materials are prevented from reacting in the mixing process, and stable product quality is ensured.

The invention relates to the technical field of yellow phosphorus chemical industry, in particular to a preparation process of food-grade high-purity sodium pyrophosphate, which sequentially comprises the steps of raw material screening and pretreatment, proportioning and dissolution, neutralization reaction, polymerization dehydration, purification and refining, and drying and crushing. By controlling the purity (the main content is greater than or equal to 98%) and the particle size (80-120 meshes) of the raw material sodium dihydrogen phosphate, the temperature (50-70 DEG C), the pH value (8.5-9.5) and the stirring parameters of the dissolution and neutralization stages, and introducing a heavy metal removal agent after dissolution, and adopting the process conditions of 160-180 DEG C and 0.1-0.3 MPa in the polymerization stage, the heavy metal removal agent is added to remove the heavy metal in the polymerization stage. And then active carbon decoloration, precise filtration, programmed cooling crystallization, vacuum drying and superfine grinding are combined to form a set of complete and controllable preparation process. The problems of insufficient product purity and more harmful impurities (such as heavy metal) residues caused by inaccurate process control in the prior art are effectively solved, efficient preparation and deep purification of sodium pyrophosphate are realized, and the product purity stably reaches 96.5% or above.

The invention relates to the technical field of yellow phosphorus chemical industry, in particular to a method for preparing sodium dihydrogen phosphate by purifying crude sodium pyrophosphate. Comprising the following steps: mixing a byproduct crude sodium pyrophosphate with water, filtering and separating filter residues containing sodium chloride to obtain a sodium pyrophosphate crude filtrate; adding phosphoric acid into the sodium pyrophosphate coarse filtrate, and obtaining sodium dihydrogen phosphate coarse liquid without side reaction after sodium pyrophosphate is completely hydrolyzed into sodium dihydrogen phosphate; adding a decolorizing agent into the sodium dihydrogen phosphate crude solution, removing organic pigments in the sodium dihydrogen phosphate crude solution and reducing the impurity content of iron ions to obtain a decolorized sodium dihydrogen phosphate solution; carrying out filter pressing treatment on the decolored sodium dihydrogen phosphate solution, and removing suspended solids, decoloring agent residues and trace insoluble impurities to prepare a clear and transparent sodium dihydrogen phosphate refined solution; through the mode, the effects of efficiently purifying the byproduct crude sodium pyrophosphate and converting the byproduct crude sodium pyrophosphate into high-quality sodium dihydrogen phosphate, realizing resource cyclic utilization of the byproduct and reducing the purchase cost of raw materials are achieved.

This invention discloses a cultivation method for increasing the starch content of duckweed, relating to the field of plant culture technology, comprising the following steps: taking pig farm biogas slurry, adjusting ammonia nitrogen to 10 mg / L~20 mg / L, total phosphorus to 0.1 mg / L~2.0 mg / L, and pH to 5.0~6.0, then inoculating initial duckweed into it and culturing for 5~7 days to obtain acclimatized duckweed; taking pig farm biogas slurry, adjusting ammonia nitrogen to 40~50 mg / L, total phosphorus to 0.4 mg / L~5.0 mg / L, and pH to 5.0~6.0, then adding sodium pyrophosphate and Bacillus amyloliquefaciens, then inoculating the acclimatized duckweed into it and culturing for 2~3 days to obtain high-starch duckweed. This invention constructs a two-step cultivation system of acclimatization and stress through culture solutions with differentiated nitrogen and phosphorus concentrations, and with the synergistic effect of sodium pyrophosphate and Bacillus amyloliquefaciens, achieves efficient and stable accumulation of duckweed starch.

This invention belongs to the field of sodium-ion battery cathode materials, specifically disclosing a method for preparing a sodium iron pyrophosphate / C composite material. The method involves pre-reacting iron source A and iron source B to obtain a composite iron source, then adding sodium, phosphorus, and carbon sources for mechanical mixing, followed by solvent removal to obtain precursor powder. The precursor powder is then subjected to high-temperature calcination to obtain the sodium iron pyrophosphate / C composite material. This invention also includes the material prepared by the described method and its applications. The material prepared by this method exhibits excellent fast-charging performance and long-cycle stability.