56 results about "Sodium nitrate" patented technology

Method for producing a shatter-resistant membrane glass (2) of a glass component of a measuring half-cell (1) of an analyte-sensitive sensor, comprising: - providing at least one membrane glass (2) of a sensor blown onto a shaft (3), which consists of a sodium- and lithium-containing glass, preferably sodium- and lithium silicate glass, or of a lithium-containing glass, preferably lithium silicate glass, or comprises one of these materials; - bringing the at least one membrane glass (2) blown onto a shaft (3) into contact with a pickling solution containing sodium ions, preferably a sodium acetate or sodium nitrate solution or a melt containing sodium ions; - heating the membrane glass (2) at a temperature of 200°C-500°C, preferably 300-450°C, more preferably 400-450°C for 10-20 minutes, wherein the membrane glass (2) is ion-sensitive.

This invention discloses a method for preparing high-elongation bars for cold forging, belonging to the field of aluminum alloy preparation technology. Through optimization of composition and process, the prepared bars possess high purity, uniform and fine equiaxed grain structure, and excellent plasticity, with significantly improved elongation. This meets the stringent requirements of cold forging for high material plasticity, resulting in a bright, crack-free surface and uniform grains after cold forging, overcoming problems such as oxide scale, coarse grains, and poor dimensional accuracy caused by hot forging. Furthermore, the introduction of modified talc and sodium nitrate as refining agents further promotes uniform microstructure, achieving high elongation and excellent cold forging performance.

This invention discloses a culture medium for manganese-oxidizing bacteria suitable for low-carbon source environments in water supply networks and its application. The culture medium is prepared by mixing ferric ammonium citrate, manganese sulfate, ammonium sulfate, sodium chloride, magnesium sulfate, dipotassium hydrogen phosphate, and sodium nitrate, followed by high-temperature and high-pressure sterilization to obtain a culture solution. Manganese sulfate is added to the culture solution to obtain the manganese-oxidizing bacteria culture medium. Manganese-oxidizing bacteria are screened using this culture medium. Cast iron pipe scale is subcultured in the medium to enrich the manganese-oxidizing bacteria culture solution. The enriched manganese-oxidizing bacteria culture solution is diluted and spread onto agar solid medium, and incubated at a constant temperature to obtain manganese-oxidizing bacteria colonies. This invention solves the problem of altered bacterial physiological metabolism caused by high concentrations of added manganese ions, effectively improving bacterial activity and manganese oxidation capacity.

The application provides a method for preparing carbon nitride-carbonate bismuth oxide composite nanosheets by a molten salt one-pot method, sodium bismuthate, melamine and sodium nitrate are mixed and uniformly ground to obtain a solid mixture; the solid mixture is heated at 350 DEG C, sodium nitrate is molten to form an ionic molten salt medium, and a one-pot reaction is simultaneously carried out in the medium: sodium bismuthate and melamine are converted into carbonate bismuth oxide through an oxidation-reduction reaction, melamine is simultaneously converted into graphite phase carbon nitride through a polymerization reaction, and the synergistically generated carbonate bismuth oxide and graphite phase carbon nitride are in-situ compounded to form g-C3N4-Bi2O2CO3 composite nanosheets. The application is based on a synthesis strategy of realizing multiple chemical reactions in a single molten salt environment, in-situ compounding to form a heterojunction, and simultaneously generating g-C3N4 and Bi2O2CO3 in one step and in-situ bonding, and the preparation steps are simple, the operation is convenient, the reaction conditions are mild, and the method is suitable for industrial production.

This invention provides a method for preparing sodium nitrite, belonging to the field of chemical technology. The method includes the following steps: S1, guiding the slurry from the bottom of the thickener of a crystallizer to a primary vertical centrifuge for centrifugation and dehydration, obtaining sodium nitrite solid crystals and sodium nitrite crystallization mother liquor; S2, introducing the sodium nitrite solid crystals into a washing tank, adding soft water and saturated sodium nitrite reflux liquid, and mixing thoroughly under the action of a stirrer; the washed sodium nitrite solid crystals are then transferred to a secondary vertical centrifuge for centrifugation and dehydration, yielding high-quality sodium nitrite and sodium nitrite filtrate. Most of the saturated sodium nitrite overflowing from the secondary centrifuge returns to the washing tank to adjust the solid content entering the secondary vertical centrifuge; a small portion of the overflow overflows to a filtrate tank equipped with a stirrer, and the filtrate is pumped into the original mother liquor pipeline via a discharge pump. This invention's method for preparing sodium nitrite yields high-quality sodium nitrite with a high yield.

The application relates to the technical field of plugging removing agents for oilfield recovery, in particular to a foamed acid plugging removing system and a preparation method thereof. The foamed acid plugging removing system comprises a foamed acid component, a foaming agent and a gas phase component, and the foamed acid component comprises, in mass ratio, oxalic acid, phosphoric acid, triethanolamine, dimethyl diallyl ammonium chloride, acetic acid, disodium phosphate and sodium nitrite in a mass ratio of (10-12):(3-5):4:2:(1.5-2.5):0.05:0.05:1. The total weight m1 of the foamed acid component and the total weight m2 of the foaming agent satisfy the relationship m1:m2=100:(1.5-2.5). The volume V1 of the gas phase component and the total volume V2 of the foamed acid component satisfy the relationship V1:V2>=40:1. The foamed acid plugging removing system can improve the plugging removing effect of an acid plugging removing agent in a heterogeneous formation, so that the plugging material dissolution rate is above 65%, the dissolution rate is above 1.20g / (m 2 ·h), the foaming multiple is above 4.0, and the stable foaming time is above 420s.

Provided is a separator used for a secondary battery. The separator may comprises a complex-containing layer which is provided on a surface in contact with a negative electrode of the secondary battery and which contains an electrolyte complex. The electrolyte complex may contain a nitrate and a coordination substance. The nitrate may include at least one selected from lithium nitrate, potassium nitrate, cesium nitrate, sodium nitrate, silver nitrate, calcium nitrate, zinc nitrate, copper nitrate, magnesium nitrate, indium nitrate, aluminum nitrate, ammonium nitrate, barium nitrate, and iron nitrate.

The application belongs to the technical field of organic synthesis, and relates to an aryl-substituted halogenated s-triazine compound and a preparation method thereof. The aryl-substituted halogenated s-triazine compound is shown as formula (I). The preparation method of the compound is as follows: a benzonitrile derivative, ethylene glycol methyl ether, dicyandiamide and potassium hydroxide are mixed and heated, and compound 1 is obtained through reaction; compound 1 and acetonitrile are mixed, and a sulfuric acid solution, sodium nitrate and a cuprous chloride solution are added dropwise in sequence, and then reaction is carried out after dropwise addition is completed; and a target product is obtained. The synthesis method has the advantages of less impurity generation, high conversion rate and high product quality.

The application discloses a method for electrochemically synthesizing platinum nitrate, and belongs to the technical field of precious metal chemical industry and electrochemical synthesis. The method discards the traditional fixed platinum anode, adopts a chemically inert electrode, and directly suspends platinum powder in a composite electrolyte composed of nitric acid, high-concentration sodium / potassium nitrate supporting electrolyte and sulfamic acid complexing agent. Under strong mechanical stirring, the electrode is subjected to electrolysis by applying a composite waveform current of pulse current or direct current superimposed on alternating current with specific parameters, so that the platinum powder is efficiently oxidized and dissolved through dynamic collision. After the electrolyte is subjected to heat filtration, the electrolyte is concentrated under low-temperature and reduced pressure until a crystal film appears, and then the electrolyte is subjected to cooling crystallization, washing and drying, so that a high-purity platinum nitrate product is obtained. The method solves the problem of anode passivation, significantly improves the current efficiency and reaction rate, is green and environment-friendly, has high product purity, and is easy to realize continuous production.

This invention relates to the field of sodium nitrate processing equipment technology, and discloses a sodium nitrate preparation equipment and preparation method, including a tank, four support frames fixedly connected to the outer wall of the tank, and a feed pipe connected through the top of the tank. This invention addresses the problem of some crystals solidifying on the inner wall of the tank due to high temperature. It incorporates a limiting mechanism and a floating mechanism inside the equipment. When the motor drives the stirring frame to agitate via a drive rod, the vortex-like solution generates rotational force. This rotational force drives the mounting ring to rotate via the floating component. The rotating mounting ring then drives the arc-shaped rubber rod to rotate circumferentially via the fixed frame. During this process, the arc-shaped rubber rod scrapes against the inner wall of the tank. When large ripples appear on the liquid surface due to agitation, the arc-shaped rubber rod can promptly scrape and remove the liquid from the inner wall of the tank, effectively reducing the total amount of crystals adhering to the inner wall of the tank due to high temperature.

The application belongs to the technical field of electrocatalytic materials, and discloses a supported iridium oxide-based catalyst and a preparation method and application thereof. The application provides a preparation method for in-situ carrier production and loading of a supported iridium oxide-based catalyst. A carrier raw material which can be thermally decomposed below 400 DEG C is directly mixed with an iridium raw material in a medium such as sodium nitrate, and a nano-sized oxide carrier is generated in-situ through calcination. The supported iridium oxide-based catalyst IrO2 is uniformly distributed on the surface of a CeO2, TiO2 or ZrO2 carrier in the form of nanoparticles, and the interface is firmly combined, thereby significantly improving the utilization rate of the noble metal iridium and exhibiting excellent catalytic activity and stability in the anode oxygen evolution reaction of proton exchange membrane water electrolysis.

The application discloses a preparation method of high-purity sodium nitrate in the technical field of inorganic chemical industry, and comprises the following steps: dissolving crude sodium nitrate in deionized water and heating and stirring to obtain a crude solution; pre-saturating and activating a multi-dimensional cerium tungsten titanium heteropoly acid salt grafted mesoporous silica-aluminum skeleton material in saturated sodium nitrate aqueous solution; adding the activated material into the crude solution to perform stirring reaction, and filtering to obtain a sodium nitrate mother liquor; performing vacuum concentration, natural cooling crystallization, centrifugal separation and drying on the mother liquor, so that high-purity sodium nitrate is obtained. The method can efficiently remove impurities in sodium nitrate, and the product has high purity.

The application discloses a galena combined inhibitor and a use method thereof, and the combined inhibitor comprises iron sulfate, sodium nitrate and jarosite, and the mass ratio of the amount of the iron sulfate, the sodium nitrate and the jarosite is 20:(4-10):(1-2). The combined inhibitor can be applied to separation of copper-lead mixed concentrate to realize lead inhibition and copper floating, and the combined inhibitor does not need to be removed. In an acid medium, after the combined inhibitor acts, not only can the combined inhibitor decompose the adsorbed reagent on the surface of the copper-lead mixed concentrate, but also can promote the galena surface to be oxidized to generate hydrophilic PbSO4 and PbO, while the chalcopyrite surface is oxidized to generate hydrophobic elemental sulfur (S 0 ), thereby expanding the floatability difference between the copper-lead sulfide, the jarosite is selectively adsorbed on the surface of the galena, further reducing floatability of the lead, and improving the copper-lead separation efficiency. The copper concentrate and the lead concentrate obtained by the application have high recovery rates, low mutual content, reusable acid liquid, low cost and environmental protection.

The application discloses a lithium-carbon fluoride battery electrolyte and application, and belongs to the technical field of lithium / carbon fluoride primary batteries. The lithium-carbon fluoride battery electrolyte comprises lithium salt, solvent and NO3 ‑ additive; the solvent comprises high dielectric constant solvent, ether solvent and nitrogen heterocyclic crown ether solvent; the NO3 ‑ additive is at least one of lithium nitrate, copper nitrate, ammonium nitrate, potassium nitrate, sodium nitrate, barium nitrate, zinc nitrate, lead nitrate, nickel nitrate, magnesium nitrate, calcium nitrate, strontium nitrate and cesium nitrate; the NO3 ‑ additive has a mass fraction of 5% to 20%. The high-concentration nitrate additive is introduced to form a protective layer on the surface of the lithium metal negative electrode, thereby inhibiting the side reaction of the lithium metal and the solvent and accelerating the Li + transporting effect, thereby reducing the polarization phenomenon during battery discharging; the nitrogen heterocyclic crown ether can promote the dissolution of the high-concentration nitrate and the lithium fluoride of the positive electrode in the battery discharging process, reduce the polarization of the battery and improve the energy density of the battery.

This invention discloses a high-temperature resistant downhole emulsion explosive and its preparation method, belonging to the field of emulsion explosive technology. The emulsion explosive comprises an aqueous phase material, an oil phase material, and a sensitizer, with a mass ratio of (88-96):(4-12):(0.8-2.0). The aqueous phase material, by mass parts, includes the following raw materials: 70-80 parts ammonium nitrate, 4-6 parts sodium nitrate, 5-8 parts urea, 0.1-0.6 parts chitosan quaternary ammonium salt, and 10-20 parts water. The oil phase material, by mass parts, includes the following raw materials: 50-70 parts composite oil phase and 20-40 parts composite emulsifier, which includes Span80 and polyisobutylene succinimide derivatives. This invention involves adding the aqueous phase material to the oil phase material, adding the sensitizer to the emulsion matrix formed by emulsification, and stirring to prepare the emulsion explosive. The emulsion explosive provided by this invention is suitable for use in deep well high-temperature environments and exhibits good high-temperature stability.

This invention provides a method for preparing a covering agent through high-temperature modification of electrolytic aluminum cleaning slag, along with its product and preparation system. The method first accurately determines the total molar content of the components to be oxidized in the cleaning slag. Then, sodium nitrate, a strong oxidant, is added according to a stoichiometric ratio. After uniform mixing, the mixture is calcined within a specific high-temperature range. The strong oxidizing environment generated by the decomposition of sodium nitrate completely oxidizes the hazardous component AlN. The final product mainly consists of alumina, sodium aluminate, and stable fluoroaluminate, whose physicochemical properties are highly compatible with those of electrolytic aluminum covering agents and can be directly applied. The system of this invention integrates an online component analyzer and an automatic feeding device, which can be linked with a control unit to accurately and automatically dispense sodium nitrate relative to the molar content of AlN+Al in the cleaning slag, achieving continuous, automated, and clean industrial production of the high-temperature modification method.

This invention relates to the field of galvanized steel technology, and proposes a scratch-resistant galvanized steel strip and its preparation method. The scratch-resistant galvanized steel strip comprises, from bottom to top, a steel strip, a hot-dip galvanized layer, and a passivation layer. During the preparation of the passivation layer, each 1L of passivation solution includes the following components: 5-10g sodium molybdate, 1-2g sodium nitrate, 0.1-0.3g sodium metavanadate, 0.5-0.8g titanylfluoride, and 0.2-0.5g bis(1,6-hexanetriamine)pentamethylenephosphonic acid. This technical solution solves the problems of poor scratch resistance and low surface hardness of existing galvanized steel strips.

This invention discloses a method for crystallizing sodium nitrate in the field of inorganic salt crystallization technology. The method involves dissolving sodium nitrate raw material in deionized water and filtering. Magnesium-aluminum-silicon-boron composite layered oxygen hydroxyl compound nanosheets anchored with fluorine-containing cerium-zirconium hydroxide-hydrated oxides are added to the filtrate. The mixture is then dispersed under heat, cooled in stages, seeded with sodium nitrate under reduced pressure, evaporated under reduced pressure, crystallized under heat, centrifuged, washed with a saturated sodium nitrate solution, and dried to obtain sodium nitrate crystals. The fluorine-containing cerium-zirconium hydroxide-hydrated oxide-anchored magnesium-aluminum-silicon-boron composite layered oxygen hydroxyl compound nanosheets are obtained through co-precipitation of magnesium, aluminum, cerium, and zirconium nitrates, heat treatment with fluorine-containing water, silicon-boron composite modification, and heat-treated grinding and spray drying. This invention can regulate the nucleation and growth of sodium nitrate crystals, improve crystal particle size uniformity, reduce mother liquor entrainment, and improve crystal separation and drying effects.

The application relates to the technical field of fastener processing, and particularly discloses a processing technology of high-strength bolts. The processing technology of high-strength bolts comprises the following steps: pickling a steel wire rod, washing with water, blowing dry, immersing in a phosphating working solution, soaking, taking out, washing with water, blowing dry, immersing in a saponification lubricating working solution, soaking, taking out, washing with water, blowing dry, wire drawing, cold upsetting forming, wire twisting and screwing, quenching, tempering, and obtaining a high-strength bolt; the phosphating working solution is mainly made of the following raw materials: water, phosphoric acid, concentrated nitric acid, zinc oxide, sodium nitrite, manganese nitrate, copper nitrate, a corrosion inhibitor and a complexing agent. The processing technology utilizes the phosphating working solution to form a uniform, complete and tough phosphating film, improves the hardness and compactness, makes the phosphating film have the characteristics of high hardness and small grain size, is beneficial to subsequent wire drawing, cold upsetting forming and wire twisting and screwing, and the obtained high-strength bolt has the characteristic of high tensile strength, and meets the market demand.

The application discloses a method for recovering rhodium from rhodium-containing slag, and adopts a technological process of two-stage oxidation of the rhodium-containing slag, lead removal by oxalic acid, tellurium precipitation by sodium iso-VC, iron powder replacement, sulfuric acid pickling, secondary two-stage oxidation, sodium nitrite refining, ammonium chloride precipitation, acid dissolution and hydrazine hydrate reduction, so that metal rhodium in the rhodium-containing slag is dissolved and then impurity elements are separated, rhodium powder is prepared from the rhodium-containing solution after impurity removal, enrichment and refining, and the purity of the rhodium reaches 88%, and the recovery rate can reach 90%.

The application discloses a ternary mixed molten salt heat transfer and heat storage medium and a preparation method thereof. According to mass percentage, the ternary mixed molten salt comprises 20-60wt% of potassium nitrate, 8-40wt% of sodium nitrate and 10-40wt% of sodium nitrite. The mixed molten salt has a decomposition temperature greater than 600 DEG C, a melting point lower than 135 DEG C and an initial crystallization point at about 150 DEG C, and has a low melting point and a wide use temperature range.

This invention provides a method for preparing bismuth titanate nanoparticles using molten salt assistance. Sodium bismuthate dihydrate, sodium sulfite, titanium sulfate, and sodium nitrate are mixed and ground uniformly to obtain a solid mixture. The solid mixture is then heated at 350°C to melt the sodium nitrate, creating an ion-molten liquid environment. Under this environment, a redox reaction between sodium bismuthate dihydrate and sodium sulfite generates the transition product bismuth oxysulfate, producing sodium hydroxide and creating a self-generated alkaline condition. Simultaneously, under this self-generated alkaline condition, bismuth oxysulfate reacts with titanium sulfate to form bismuth titanate. The reaction product is then post-processed to obtain Bi... 24 Ti2O 40 Nanoparticles. The advantages of this invention are: a synthesis strategy based on an ion-molten liquid environment, accelerated reactant diffusion, and improved chemical reaction efficiency to prepare Bi. 24 Ti2O 40 Nanopowders are easy to prepare, convenient to operate, have a mild reaction, and are low in cost, making them suitable for industrial production.

This invention discloses a separation process for a mixed salt containing rubidium nitrate and sodium nitrate. Based on the ternary system (RbNO3-NaNO3-H2O) phase diagram, the process achieves the separation of rubidium nitrate and sodium nitrate by utilizing the salt precipitation pattern during heating and cooling. The two circulating mother liquors (E2 and E3, or E1 and E3) can be recycled in the production process, resulting in no wastewater or waste residue discharge. The rubidium nitrate and sodium nitrate obtained by this method have high purity, and the process is simple to operate, environmentally friendly, stable, and reliable, making it suitable for industrial production.

This invention discloses a process for the recovery and resource utilization of wastewater and waste gas generated during silver powder production. It effectively recovers and treats four types of wastewater generated during silver powder production: organic-free ammonium nitrate wastewater, organic-free sodium nitrate wastewater, sodium nitrate wastewater containing organic matter, and ammonium nitrate wastewater containing both organic matter and sodium nitrate. The invention effectively recovers and treats all four main types of wastewater and two types of waste gas generated during silver powder production, converting them all into the necessary production materials such as ammonia, concentrated nitric acid, dilute nitric acid, and sodium hydroxide, thus achieving complete recovery and utilization of all wastewater and waste gas.

The application discloses a high-etching-rate selective etching liquid and a preparation method and application thereof, and comprises the following components in parts by mass: 5-10 parts of organic acid, 60-80 parts of inorganic acid, 8-15 parts of oxidizing agent, 1-2 parts of nitrate, 1-2 parts of additive, and 5-15 parts of pure water; the nitrate comprises at least one of sodium nitrate, potassium nitrate, calcium nitrate and ammonium nitrate; and the additive is an organic sulfide substance. The etching liquid is clear and colorless, has high etching rate and high selectivity, is simple to prepare, has good etching uniformity, and can be applied in the field of etching semiconductor display panel manufacturing, and mainly solves the problem of serious shrinkage of upper metal (Al and Mo layers) after etching of a Mo / Al / Ti substrate.

This invention provides a coal-saving agent that stabilizes and improves combustion, its preparation method, and its application, belonging to the field of coal combustion technology. The coal-saving agent provided by this invention comprises: 5-10% oxidant, 1-8% combustion improver, 5-15% catalyst, 1-5% desulfurizer, 2-4% calcium magnesium acetate, 1-4% dispersant, and the balance being water. This invention uses potassium permanganate and sodium nitrate as oxidants, which have different decomposition temperatures and can release oxygen at different temperatures and time periods, thus promoting more complete combustion of coal. It uses manganese tetroxide, cerium dioxide, and ferric chloride as catalysts, which have a synergistic effect, further promoting coal combustion and burnout. The addition of calcium magnesium acetate as an electron transfer medium lowers the activation energy, reduces the ignition temperature, and improves the burnout rate. Controlling the composition and dosage of each component enhances the coal-saving effect of the agent.

The application discloses a controllable-hardness emulsion explosive and a preparation method thereof, and relates to the technical field of industrial explosive preparation. Raw materials include, by weight, 80-102 parts of water-phase materials, 3-7 parts of oil-phase materials, 1-2 parts of emulsifiers, 0.1-1 parts of sensitizers, 0.1-1.5 parts of quick-hardening agents, and 0.25-0.7 parts of catalyst compositions. The water-phase materials include 70-80 parts of ammonium nitrate, 5-7 parts of sodium nitrate and 5-15 parts of water. The oil-phase materials include 2-4 parts of wax and 1-3 parts of fatty acids. The sensitizers contain 0.05-0.5 parts of physical sensitizers and 0.05-0.5 parts of chemical sensitizers. The quick-hardening agent is a silicate. The catalyst composition includes 0.2-0.5 parts of nano tin dioxide microcapsules and 0.05-0.2 parts of gemini surfactants. The nano tin dioxide microcapsules have a core material, an inner layer of ethyl cellulose as a wall material and an outer layer of paraffin as a wall material. The emulsion explosive provided by the application realizes dynamic control of the hardness of the emulsion explosive.

The invention provides a method for intensively and synchronously extracting vanadium and chromium from high-chromium vanadium slag, and belongs to the field of metallurgical chemical industry. The preparation method comprises the following steps: by taking diboron trioxide, lanthanum trioxide and cerium dioxide as catalysts and taking high-chromium vanadium slag, sodium nitrate and sodium hydroxide as raw materials, roasting a mixed material by using a microwave muffle furnace to obtain roasted clinker; the roasted clinker is cooled, crushed, screened and leached again, and leaching liquid containing vanadium and chromium and leaching residues are obtained after solid-liquid separation; after the discharged slag is dried, weighing is carried out; and calculating to obtain the leaching rates of vanadium and chromium. According to the invention, the dosage of the catalyst is 0.25%-2% and is far lower than the dosage of 5%-8% of calcium chloride in the prior art, so that the medicament cost is reduced; and the alkali residue ratio can be reduced, the alkali salt consumption can be reduced, and the leaching rates of vanadium and chromium are still stabilized to be 96% or above. The method is focused on synchronous and efficient extraction of vanadium and chromium elements in the high-chromium vanadium slag, and is mainly used for raw material supply in the high-end fields of vanadium redox flow battery positive electrode materials, aerospace high-temperature alloys and the like.