33 results about "Potassium Pyrophosphate" patented technology

The invention discloses a method for preparing a copper-nickel alloy for a solid-state battery through an alkaline system, and belongs to the technical field of solid-state batteries. A pyrophosphate aqueous solution system is used as an electrolyte, and the copper-nickel alloy is prepared through an electro-deposition method; the pyrophosphate aqueous solution system comprises the following components: raw materials of copper pyrophosphate and nickel chloride, a main complexing agent of potassium pyrophosphate, an auxiliary complexing agent of ethylenediaminetetraacetic acid or potassium sodium tartrate, a brightener and an additive. The components and thickness of the alloy are adjusted by changing the metal ion concentration, the input amount of the complexing agent and the like and changing the technological parameters (pH, current density, electrodeposition time and the like), the copper-nickel alloy with the tensile strength reaching 1012.70 MPa, the elongation reaching 5.27% and the nickel content being 8.93% can be prepared, the corrosion resistance is excellent, the coating thickness is uniform, electrodeposition can be conducted at the normal temperature, and the copper-nickel alloy can be used for preparing the copper-nickel alloy with the tensile strength reaching 1012.70 MPa, the elongation reaching 5.27% and the nickel content reaching 8.93%. Therefore, the method is suitable for large-scale industrial production.

The application discloses a production process of electroplating grade potassium pyrophosphate, which uses potassium carbonate and diaphosphorus pentoxide as raw materials, and adds a catalyst to react in a high-pressure reaction kettle. After the reaction is completed, water is added for dissolution, and the pH value of the slurry is controlled to be 9.0-10.0. After being filtered through a precision filter, the slurry is punched into a slurry storage tank, and the slurry storage tank is maintained at 75-95 DEG C. The slurry in the storage tank is punched into an evaporation and concentration device for concentration, and then the concentrated liquid is punched into a continuous crystallization device for continuous crystallization operation. After centrifugal treatment, the filtrate is recycled into the evaporation and concentration device. The potassium pyrophosphate crystals are subjected to vacuum drying treatment in a vacuum drying equipment, and then are packaged into finished products after being crushed and sieved. The potassium pyrophosphate crystals obtained by the application have high purity, less caking phenomenon, and stable and controllable product quality.

The invention belongs to the technical field of catalysts. The invention provides a catalyst for preparing cyclopentanone through cyclopentanol dehydrogenation and a preparation method thereof.The preparation method comprises the steps that S1, 120-126 g of potassium pyrophosphate, 10-13 g of stannous chloride, 8-10 g of copper sulfate and 2-3 g of carbon nano tube powder are added into 1 L of deionized water, the pH value is adjusted to 7-8, and an electroplating solution is obtained; s2, assembling a PS colloidal crystal template on the pretreated copper sheet to obtain a copper sheet with the PS colloidal crystal template; s3, taking a copper sheet with the PS colloidal crystal template as a cathode and a titanium mesh as an anode, performing electro-deposition in the electroplating solution, roasting at 500-550 DEG C for 3-4 hours, stripping and grinding to obtain a Sn-Cu-CNT composite material; s4, etching the Sn-Cu-CNT composite material with 10vol% acetic acid for 30-35 minutes in an ice bath at 0-5 DEG C to obtain an etched material, putting the etched material into an ammonia water-EDTA (Ethylene Diamine Tetraacetic Acid) mixed solution with the pH (Potential of Hydrogen) of 9.5, and oscillating for 10 minutes at 60 DEG C to obtain a carrier; and S5, impregnating the carrier with a nickel nitrate solution, drying, and roasting to obtain the catalyst. The method can effectively improve the conversion rate of cyclopentanol and the selectivity of cyclopentanone.

This invention provides a method for degreasing and whitening battery aluminum casings. The method includes the following steps: preparing a degreasing and whitening solution from powder and water; using the degreasing and whitening solution to degrease and whiten the battery aluminum casing; rinsing the degreased and whitened aluminum casing to obtain a clean battery aluminum casing. The powder is potassium pyrophosphate, and the water includes sodium hydroxyethylidene diphosphonate, surfactant, organic solvent, and deionized water. This invention combines degreasing and whitening, effectively reducing the cleaning process of battery aluminum casings and improving production efficiency. This method does not require the use of a special PVC tank; only a stainless steel tank commonly used in industrial cleaning is needed.

The application relates to a magnesium alloy micro-arc oxidation process, a magnesium alloy and application thereof, and the process comprises the following steps: firstly, a magnesium alloy workpiece to be treated is pretreated and then placed into an electrolyte; the composition of the electrolyte comprises the following components: 5-10 g / L of sodium silicate, 10-15 g / L of potassium pyrophosphate, 1-3 g / L of sodium aluminate, 3-5 g / L of sodium hydroxide and 1-10 g / L of potassium fluorotitanate; then, the magnesium alloy workpiece is subjected to micro-arc oxidation treatment by using the electrolyte; during the micro-arc oxidation treatment, the pH value of the electrolyte is greater than 12, the treatment temperature is 25+ / -5 DEG C, the current density is 1-5 A / dm2, and the treatment time is 5-60 min; then, the electrolyte is subjected to component analysis according to a preset interval, and the concentration of each component of the electrolyte is adjusted according to the analysis result. The application solves the problems that the yield of magnesium alloy prepared by the current magnesium alloy micro-arc oxidation is low, the corrosion resistance is insufficient, and the magnesium alloy is difficult to be used in a cooling liquid corrosion environment for a long time.

A preparation method of a new type of environment-friendly natural latex product. The method comprises the following steps: S1, preparation of a sodium salt solution of shellac resin; S2, adding potassium pyrophosphate, potassium oleate, potassium ricinoleate and sulfur dispersion into natural latex, and stirring and aging to obtain a mixture A; S3, adding calcium salt aggregates of shellac resin and a rubber deodorant into the mixture A, stirring uniformly, immediately transferring the mixed glue liquid into a foaming machine to perform foaming, injecting zinc oxide dispersion and sodium fluosilicate dispersion during the foaming process, and injecting the foamed latex mixture into a pillow mold to enter a steaming oven for vulcanization; and S4, washing and vacuum drying the semi-finished product of the latex product, and completing the production. The method is convenient to process and reliable in environmental protection.

The invention discloses a silicon carbide wafer cleaning method which comprises the following steps: S100, providing a self-rotating to-be-cleaned silicon carbide wafer, and carrying out jet cleaning on the to-be-cleaned silicon carbide wafer by using water-gas two-fluid to obtain a first wafer; s200, a first cleaning solution is used for cleaning the first wafer to obtain a second wafer, a solute of the first cleaning solution comprises a polyoxyethylene ether surfactant, potassium pyrophosphate and a solubilizer, and a solvent of the first cleaning solution is ultrapure water; s300, cleaning the second wafer by using an ammonia water solution to obtain a third wafer; s400, cleaning the third wafer by adopting an SC-2 cleaning solution and a hydrofluoric acid solution in sequence to obtain a fourth wafer; and S500, performing jet cleaning on the fourth wafer through water-gas two-fluid, and drying to obtain a fifth wafer. By using the first cleaning solution comprising the polyoxyethylene ether surfactant, the potassium pyrophosphate and the solubilizer, the surface cleanliness of the silicon carbide wafer is improved.

This invention relates to an outdoor cultivation method for Haematococcus pluvialis to improve astaxanthin yield, belonging to the field of Haematococcus pluvialis cultivation technology. The invention includes four main steps: (1) after Haematococcus pluvialis is cultured indoors, it is separated into outdoor GP pipes and cultured under conventional stress for three days, followed by the addition of red-converting culture medium; (2) the carbon dioxide and air ratio is adjusted the next day to adjust the pH value of the algal solution in the GP pipe to between 9.0 and 10.5; (3) when the pH value reaches between 9.0 and 9.5, potassium pyrophosphate is added; and (4) the Haematococcus pluvialis is then cultured outdoors for 11 to 22 days. By adding potassium pyrophosphate during the outdoor cultivation process, this invention effectively improves the synthesis rate of astaxanthin. After adding potassium pyrophosphate and continuing to cultivate for 11 days, the astaxanthin content in the algal solution can reach 5.7%, shortening the cultivation time and accumulating more astaxanthin in a shorter time, thereby improving the astaxanthin yield.

This invention discloses a dyeing method for fully water-soluble fertilizer and the water-soluble fertilizer itself, belonging to the field of water-soluble fertilizers. The method includes the following steps: M1, dyeing fully water-soluble fertilizer granules with a fully water-soluble fertilizer dyeing solution, the amount of which is 1% to 10% of the fertilizer's weight; M2, granulating the dyed fully water-soluble fertilizer granules in a mechanical extrusion granulation device to obtain the fully water-soluble fertilizer product; the dyeing solution is composed of the following components: 1 to 30 parts by weight of a single metal humate, 15 to 35 parts by weight of glycerol, 3 to 8 parts by weight of sodium lignosulfonate, 0.3 to 5 parts by weight of potassium pyrophosphate, and 25 to 50 parts by weight of pure water. This invention can achieve uniform and firm dyeing of ammonium polyphosphate without damaging its water solubility and fertilizer efficacy. The process is simple and the cost is controllable.

This invention discloses a rose essential oil sleep-aiding latex pillow and its processing method. The latex pillow comprises the following components in parts by weight: 90-100 parts natural latex, 1-9 parts sulfur, 1-5 parts vulcanization accelerator, 1.5-2 parts anti-aging agent, 1-6 parts zinc oxide, 0.5-2 parts sodium fluorosilicate, 1-3 parts potassium ricinoleate, 0.1-2 parts potassium oleate, 0.1-2 parts potassium pyrophosphate, 0.00001-0.001 parts red pigment, and 0.0001-0.1 parts modified rose essential oil. The latex pillow is light pink in color, with the pigment content less than one-thousandth, and does not fade after washing. The modified rose essential oil has a fragrant rose scent. The natural latex content of the rose essential oil sleep-aiding latex pillow reaches 94%. The latex pillow prepared by this invention promotes sleep and is convenient and reliable.

The invention discloses a composition formula for cleaning a school uniform. The composition formula is prepared from the following components: 15 to 20 parts of alkyl glycoside, 8 to 12 parts of cocamidopropyl betaine, 1 to 3 parts of EDTA (Ethylene Diamine Tetraacetic Acid)-disodium, 3 to 5 parts of sodium citrate, 2 to 4 parts of potassium pyrophosphate, 5 to 10 parts of emulsion decomposer, 1 to 2 parts of polyhexamethylene biguanide hydrochloride, 0.5 to 1.5 parts of tea tree essential oil, 0.1 to 0.3 part of stabilizer and the balance of solvent. The preparation process comprises the following steps: firstly adding deionized water according to a formula ratio into a reaction container, then adding alkyl glycoside and cocamidopropyl betaine, then adding EDTA-disodium, sodium citrate, potassium pyrophosphate and polyethylene glycol 400, and finally adding compound enzyme, polyhexamethylene biguanide hydrochloride, tea tree essential oil and xanthan gum. According to the present invention, with the composition, the efficient decontamination and the mild clothes protection can be achieved by compounding the surfactant, the synergist and the functional auxiliary agent according to the fabric, the stain and other requirements of the school uniform cleaning so as to provide the school uniform cleaning composition with the good market prospect in the fields of laundry detergents, washing soaps, soaking washing powder, explosion salt, soap powder and cleaning paste.

The invention discloses a liquid fertilizer for promoting durian expansion and a preparation method thereof, and belongs to the technical field of agricultural fertilizers. The liquid fertilizer is prepared from the following components in mass volume ratio: 450 to 500g / L of potassium pyrophosphate, 60 to 70g / L of ammonium polyphosphate, 2 to 5g / L of benzylamine and gibberellic acid compounding agent, EDTA (Ethylene Diamine Tetraacetic Acid) chelated calcium, EDTA chelated magnesium and the like, and the balance of deionized water. The preparation method comprises the following steps: weighing the raw materials, preparing the basic nutrient solution, adding the medium trace elements and the active components, adding the stabilizer, fixing the volume, filtering, sub-packaging and the like. During application, a mode of combining foliage spraying and root irrigation after dilution is adopted. The formula is high in pertinence, all the components have a synergistic effect, the weight of a single durian fruit can be remarkably increased, the fruit cracking rate is reduced, the fruit sweetness is improved, the components are safe and environmentally friendly, the preparation technology is simple, stability is good, the fertilizer is suitable for large-scale production and durian planting application and popularization, and the planting economic benefits can be effectively increased.

The application provides an anti-high-temperature and anti-pollution organic salt well completion fluid and a preparation method thereof, and raw materials of the well completion fluid include, in terms of weight parts, 100 parts of water, 25-30 parts of potassium formate, 100-130 parts of potassium pyrophosphate, 0.3-0.7 parts of a high-temperature tackifying and filtrate-reducing agent, 1-3 parts of a high-temperature filtrate-reducing agent, 2-5 parts of a manganese powder plugging agent, 0.5-1.5 parts of triphosphite, 0.1-0.3 parts of tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester, 1-2 parts of polyethylene oxide-polypropylene oxide copolymer, 1-3 parts of nano silicon dioxide, 0.5-1.5 parts of sodium carboxymethyl cellulose and 0.3-0.8 parts of polyacrylamide. The anti-high-temperature and anti-pollution organic salt well completion fluid system has good plugging property, can reduce formation filtration and effectively protects a reservoir.

The application relates to a polyanion sodium ion battery positive electrode composite material, and belongs to the technical field of sodium ion batteries. The chemical expression of the positive electrode composite material is sintered by compounding and sintering of specific design carbon-doped potassium pyrophosphate iron powder and a sodium pyrophosphate iron phosphate matrix. The carbon-doped potassium pyrophosphate iron is prepared by a vacuum calcination process by using a structure control agent synthesized by p-ethylphenylthiophenol and triallylamine, and the unique space symmetry structure can chelate iron and potassium ions at the molecular level, form a uniform precursor, and produce an ultra-microstructure wrapped by an edge brittle carbide after calcination. The composite material constructs a continuous three-dimensional electron conductive network and a long-range ion channel in the NFPP matrix, forms an ion conductivity transition zone at the phase interface, significantly improves the ion migration efficiency, and effectively solves the technical bottleneck of poor high-rate performance of the NFPP material.

This invention discloses an defoamer for produced water from natural gas wells and its preparation method, relating to the field of oil and gas field water treatment technology. The defoamer comprises modified organosilicon, modified hydrogenated rosin glycerol ester, modified alkyl glycoside, potassium pyrophosphate, polyethylene glycol monooleate, plant-based dicarboxylic acid ester, and deionized water. The modified organosilicon is obtained by grafting polydimethylsiloxane with terminal hydroxyl polyether and then modifying it with low-carbon carboxylic anhydride. The modified hydrogenated rosin glycerol ester is obtained by esterifying hydrogenated rosin with glycerol and then modifying it with polyoxyethylene branching. The modified alkyl glycoside is obtained by etherification and condensation of alkyl glycoside with small-molecule polyol and then modifying it with weak phosphonate. This invention addresses the complex conditions of high-altitude gas fields, characterized by high temperature, low pressure, high fine silica particles, and high humic content. It solves the problems of existing defoamers, such as easy solidification and stratification at low temperatures, poor fluidity, decreased activity, easy clogging of pipelines, and difficulty in breaking complex foams, making it suitable for the complex conditions of high-altitude gas fields.

The invention discloses a production method of ultralow-density potassium pyrophosphate, which comprises the following steps: mixing phosphoric acid and liquid potassium, preserving heat until slurry is qualified, then cooling, adding hydrogen peroxide for reaction, finally filtering, spray-drying in a polymerization furnace, and polymerizing to obtain the ultralow-density potassium pyrophosphate. Wherein when reaction slurry enters the polymerization furnace, a nozzle with an S-shaped pipeline is adopted for spraying, and spray drying and polymerization reaction are carried out. The potassium pyrophosphate product with lower density, more uniform granularity and better fluidity can be prepared, the product quality is more stable, and compared with a common potassium pyrophosphate product, the profit is higher.

The invention provides a flight control fertilizer composition for promoting wheat growth and increasing yield as well as a preparation method and application thereof, and relates to the technical field of agricultural fertilizers. The invention relates to a flight control fertilizer composition. The seaweed preservative is prepared from the following raw materials: 240 to 320 parts of an amino acid mixture, 40 to 65 parts of an enzymolysis seaweed extract, 6 to 15 parts of sodium dodecyl benzene sulfonate, 6 to 15 parts of sodium alkyl naphthalene sulfonate, 6 to 15 parts of sodium dodecyl sulfate, 110 to 160 parts of anhydrous dipotassium phosphate, 160 to 200 parts of potassium pyrophosphate, 20 to 40 parts of ethylene glycol and 6 to 15 parts of zinc sodium ethylene diamine tetraacetate. The amino acid mixture comprises the following components: aspartic acid, glutamic acid and arginine; the preparation method comprises the following steps: carrying out freeze thawing pretreatment on brown algae, and carrying out enzymolysis treatment by using cellulase, alginate lyase and mannase, so as to obtain the enzymolysis seaweed extract. All the components interact with one another, so that the synergistic effects of promoting wheat growth and germination and increasing the yield are achieved.

The invention provides a novel ship boiler water treatment agent. The invention relates to a novel ship boiler water treatment agent, which comprises the following components by weight: 0.1-1% of hydroquinone; 20 to 30% of DEHA (diethyhexylhydroxylamine 10 to 20% of sodium hexametaphosphate; 5-10% of potassium pyrophosphate; 5-10% of polymaleic acid; 0.1 to 1% of a bio-based surfactant; 5 to 20 percent of NN (N, N-diethylhydroxylamine); and the balance of pure water. The invention provides a novel ship boiler water treatment agent which is prepared by compounding hydroquinone, DEHA, sodium hexametaphosphate, potassium pyrophosphate, polymaleic acid, a bio-based surfactant, NN diethylhydroxylamine and other components, and a dynamic chelation-dispersion system and a nonionic double-effect oxygen removal environment are constructed. According to the present invention, the efficient deoxidizing agent has characteristics of simple preparation process, easy operation, low cost, easy implementation, multi-stage chelating and crystal nucleus steric dispersion on calcium and magnesium ions, significant effects of rapid deoxidizing speed, strong old scale stripping ability and the like, can effectively cope with water quality fluctuation under complex working conditions of ships, can achieve efficient deoxidizing, can provide excellent scale inhibition and old scale self-cleaning functions, and can meet the treatment requirements of complex working conditions of ship boilers.

The invention relates to a polyanion sodium ion battery positive electrode composite material, and belongs to the technical field of sodium ion batteries. The chemical expression of the positive electrode composite material is as follows: the positive electrode composite material is formed by compounding and sintering specifically designed carbon-doped potassium ferric pyrophosphate superfine powder and a ferric sodium pyrophosphate matrix. Wherein the carbon-doped potassium ferric pyrophosphate is prepared by adopting a structure control agent synthesized by p-ethyl thiophenol and triallylamine through a vacuum calcination process, the unique space symmetric structure of the carbon-doped potassium ferric pyrophosphate can be chelated with iron and potassium ions on a molecular level to form a uniform precursor, and an ultrastructure wrapped by edge brittle carbides is generated after calcination. According to the composite material, a continuous three-dimensional electronic conductive network and a long-range ion channel are constructed in an NFPP matrix, and an ion conductivity transition region is formed on a phase interface, so that the ion migration efficiency is remarkably improved, and the technical bottleneck of poor high-rate performance of the NFPP material is effectively solved.

This invention discloses a water-soluble fertilizer coloring method that enhances the coloring process, belonging to the field of water-soluble fertilizers. The method includes the following steps: S1, adding glycerol, fatty alcohol polyoxyethylene ether, dimethyl sulfoxide, and pure water to a stirring container and starting stirring to obtain a mixed solvent; S2, adding sodium lignosulfonate to the mixed solvent and continuing stirring until the sodium lignosulfonate is completely dissolved to obtain a dispersion; S3, adding potassium pyrophosphate to the dispersion and continuing stirring until the potassium pyrophosphate is completely dissolved to form a mixed solution one, adjusting the pH to form a stable system solution; S4, slowly adding a water-soluble pigment to the stable system solution and continuing stirring to obtain a colorant; S5, mixing the colorant from S4 with fertilizer, wherein the weight of the colorant is 1%~10% of the fertilizer weight, and continuing stirring to obtain a water-soluble fertilizer product. This invention completes coloring solely through material mixing. After coloring, it can significantly improve fertilizer nutrient utilization, enhance crop stress resistance, and also help improve pigment dispersibility and the binding effect between the colorant and fertilizer.

This invention discloses a composite modifier for water glass sand used in casting and a method for preparing modified water glass sand, relating to the field of water glass sand technology. The raw material composition of the composite modifier for water glass sand provided by this invention includes zinc oxide powder, magnesium silicate, lithium dihydrogen phosphate, potassium pyrophosphate, and calcium stearate. Using ceramic sand, quartz powder, and slag as sand materials, water glass binder and the composite modifier are added to obtain composite-modified water glass sand for casting. The addition of the composite modifier makes the binder film and binder bridges denser and stronger, and improves the moisture resistance of the water glass sand. When heated to high temperatures, the binder film is broken, forming numerous pores and cracks, thereby reducing the residual strength of the water glass sand. The composite-modified water glass sand for casting provided by this invention has excellent comprehensive performance, overcoming the problems of low room temperature strength, short service life, and poor collapsibility of traditional water glass sand. Furthermore, the preparation method is simple and environmentally friendly.

The application discloses a kind of pyrophosphate copper plating solution maintenance method, comprising the following steps: S1 first measure the copper ion concentration in pyrophosphate copper plating solution, then according to the required copper pyrophosphate concentration in pyrophosphate copper plating solution standard formula to supplement copper pyrophosphate;S2 first measure the pyrophosphate concentration in pyrophosphate copper plating solution treated in step S1, then according to the required mass ratio (P ratio) of pyrophosphate and copper ion in pyrophosphate copper plating solution standard formula to supplement potassium pyrophosphate, and by the supplement of potassium pyrophosphate, the pH of system is adjusted to 8.60-8.77;S3 according to the required pH value in pyrophosphate copper plating solution standard formula to add ammonia water in pyrophosphate copper plating solution treated in step S2 to carry out pH adjustment.The maintenance method of the application can make used pyrophosphate copper plating solution still be able to obtain qualified copper plating layer by maintenance.

The application provides an antibacterial gas adsorbent and a preparation method thereof. The adsorbent comprises a carrier, an antibacterial agent, an adsorption auxiliary agent and a catalytic auxiliary agent. The carrier is a composite carrier of MOFs material and carbon material. The antibacterial agent comprises at least one of copper oxide, copper chloride, copper nitrate, silver salt and zinc salt. The adsorption auxiliary agent comprises at least one of lanthanum oxide, cerium oxide, magnesium oxide and cobalt oxide and at least one of sodium citrate, potassium pyrophosphate, sodium thiosulfate and sodium hydroxyl carboxylate. The catalytic auxiliary agent is prepared by sintering melamine, ferrocene and nano copper oxide. The antibacterial gas adsorbent of the application overcomes the problem of agglomeration, has excellent antibacterial and adsorption treatment performance on organic gas, and improves the repeated application performance and recovery performance of the antibacterial gas adsorbent by matching the adsorption auxiliary agent and the catalytic auxiliary agent. The performance of the used, failed or degraded antibacterial gas adsorbent can be restored after heat treatment.

The application discloses a cleaning method of a silicon carbide wafer, and the cleaning method comprises the following steps: S100, providing a spin rotating silicon carbide wafer to be cleaned; spraying and cleaning the silicon carbide wafer to be cleaned by using a water-air two-fluid, and obtaining a first wafer; S200, cleaning the first wafer by using a first cleaning solution, and obtaining a second wafer; the solute of the first cleaning solution comprises a polyoxyethylene ether surfactant, potassium pyrophosphate and a solubilizing agent; the solvent of the first cleaning solution is ultrapure water; S300, cleaning the second wafer by using an ammonia water solution, and obtaining a third wafer; S400, sequentially cleaning the third wafer by using an SC-2 cleaning solution and a hydrofluoric acid solution, and obtaining a fourth wafer; S500, spraying and cleaning the fourth wafer by using a water-air two-fluid, and obtaining a fifth wafer after drying. By using the first cleaning solution with the components of the polyoxyethylene ether surfactant, the potassium pyrophosphate and the solubilizing agent, the surface cleanliness of the silicon carbide wafer is improved.

This invention belongs to the field of fluorochemical technology, specifically relating to a method for the high-temperature reduction of calcium sulfate to co-produce sulfuric acid and for the preparation of hydrogen fluoride, comprising the following steps: (1) mixing calcium sulfate raw materials, reducing agent and quaternary composite catalytic fluxing agent, and reducing at high temperature to generate tail gas containing sulfur dioxide; (2) after purifying the tail gas containing sulfur dioxide, passing it into a device loaded with a quaternary heteropolyacid catalyst of phosphomolybdenum tin indium, catalytically converting sulfur dioxide into sulfur trioxide and absorbing it to obtain sulfuric acid; (3) sending the pretreated fluorine-containing raw materials, sulfuric acid, and sulfuric acid oxytitanium-potassium pyrophosphate composite activated catalyst into a hydrogen fluoride reaction device to react and generate a reaction gas containing hydrogen fluoride; (4) sequentially performing solid-gas separation, cooling, demisting and deep purification on the reaction gas containing hydrogen fluoride to obtain hydrogen fluoride product. This invention overcomes the defects of existing methods such as dependence on purchased sulfuric acid, easy poisoning / high-temperature decomposition of catalyst, single function of auxiliary agent, reaction passivation, and high energy consumption.

This invention discloses a low-sodium compound phosphate for moisture retention in meat products and its preparation method. The low-sodium compound phosphate comprises the following components by weight: 52-68 parts potassium pyrophosphate; 18-28 parts sodium tripolyphosphate; 6-18 parts potassium metaphosphate; and 4-12 parts coating component. The coating component includes trehalose, potassium gluconate, and maltodextrin, with trehalose accounting for 35%-60%, potassium gluconate for 8%-22%, and maltodextrin for 25%-50%. The low-sodium compound phosphate adopts a core-shell composite particle structure, with the core layer comprising potassium pyrophosphate, sodium tripolyphosphate, and potassium metaphosphate, and the shell layer comprising the coating component. The sodium content in the low-sodium compound phosphate, calculated as sodium oxide, is 4.0%-8.5%. This invention can significantly reduce the sodium content, effectively mask the bitter flavor of potassium salts through microstructural design, and simultaneously possesses excellent moisture-proof and anti-caking properties and a synergistic effect of high water retention.

The invention discloses a slag-free high-temperature manganese phosphating solution as well as a preparation method and application thereof. The slag-free high-temperature manganese phosphating solution comprises the following components in percentage by weight: 22.0%-30.5% of phosphoric acid, 3.0%-8.5% of manganous dihydrogen phosphate, 3.5%-8.0% of manganese carbonate, 4.0%-7.0% of nitric acid, 2.0%-5.0% of nickel nitrate, 0.2%-1.5% of nickel carbonate, 0.2%-1.0% of potassium pyrophosphate, 0.2%-1.0% of tartaric acid, 0.2%-1.0% of EDTA (Ethylene Diamine Tetraacetic Acid), 0.2%-1.0% of sodium citrate, 0.2%-1.0% of EDTMP (Ethylene Diamine Tetraacetic Acid) and the balance of pure water. The phosphating solution has the beneficial effects that a uniform and wear-resistant manganese phosphating film can be formed on the surface of a workpiece, the phosphating solution adopts a specific complexing agent combination, the generation of phosphated residues is reduced, the solution system proportion is adjusted, the influence of the complexing agent on the color of a film layer can be counteracted, the blackness of the original film layer is maintained, and the product quality is improved. Meanwhile, when the phosphating solution is applied, an iron ion concentration monitoring mechanism is established, real-time detection is performed through chemical titration or instrumental analysis, and a deslagging agent is added for centralized treatment when iron ions reach an upper limit value. The problem of surface defects caused by the fact that phosphated residues are attached to workpieces is solved.

The application discloses a reusable compound leaching agent for treating arsenic contaminated soil and a use method. The method comprises the following steps: mixing and dissolving potassium pyrophosphate and potassium hypophosphite to obtain a compound leaching agent, and leaching the soil to be treated under the condition; performing solid-liquid separation on the soil after oscillation leaching, so as to obtain the repaired soil and residual leaching liquid; adding iron hydroxide and aluminum hydroxide into the residual leaching liquid, and performing solid-liquid separation after fully stirring, so that the obtained leaching liquid can be reused for leaching the arsenic contaminated soil. The compound leaching agent is formed by combining potassium pyrophosphate and potassium hypophosphite, so that the content of arsenic in the contaminated soil can be effectively reduced, the leaching liquid can be reused, the removal rate of the reused leaching agent for arsenic is high, the compound leaching agent has simple components, the leaching effect on arsenic is remarkable, the leaching agent can be reused for multiple times, the cost is low, and the compound leaching agent has a good application prospect.

This invention relates to a high-shield galvanized conduit and its preparation process, belonging to the technical field of galvanized conduit. The galvanized conduit comprises, from the inside out, a base layer, an alloy zinc plating layer, and a shielding layer. The plating solution composition of the alloy zinc plating layer is: 30-50 g / L zinc sulfate heptahydrate, 10-30 g / L sodium citrate, 120-180 g / L potassium pyrophosphate trihydrate, and 20-40 g / L sodium hypophosphite. The shielding layer, by weight, consists of: 80-90 parts water-based epoxy resin emulsion, 20-35 parts modified MXene, 10-15 parts graphene, 1-3 parts silane coupling agent, 15-25 parts curing agent, 0.2-0.8 parts defoamer, 0.5-2 parts leveling agent, and 5-15 parts deionized water. The prepared galvanized conduit exhibits excellent electromagnetic shielding effect and corrosion resistance.

The invention provides a chemical nickel plating agent, a preparation method thereof and application of the chemical nickel plating agent in preparation of solar cells, and relates to the technical field of solar cells, the chemical nickel plating agent comprises the following components: nickel sulfate, sodium hypophosphite, a composite complexing agent, a buffer agent, a composite stabilizer and a wetting agent; wherein the composite complexing agent comprises potassium pyrophosphate, sodium succinate and ammonium sulfate; the compound stabilizer comprises isothiourea propanesulfonic acid inner salt, sodium thiosulfate and benzimidazole. The alkaline chemical nickel plating solution (pH > = 8) is adopted, the reaction temperature (T < = 60 DEG C) is low, corrosion of the solution to a silicon nitride film layer on the front face of the BC cell can be reduced, the stability of the plating solution can be maintained, the current efficiency and the deposition rate can be improved under the action of the composite complexing agent and the composite stabilizer, and the electrical performance and the binding force of the BC solar cell can be improved.