919 results about "Sodium chlorate" patented technology

The invention discloses a method for preparing a composite positive electrode material by using a waste battery, and belongs to the technical field of battery recovery. The method comprises the following steps: discharging, disassembling and sorting a waste lithium iron phosphate battery to obtain a positive plate, carrying out water treatment, separating from an aluminum foil to obtain a waste lithium iron phosphate sheet, adding sodium hypochlorite, tetraethoxysilane, deionized water and hydrochloric acid, stirring to obtain SiO2-coated iron phosphate precipitate particles and a lithium-containing solution, adding sodium hydroxide into the lithium-containing solution to adjust the pH value, and carrying out solid-liquid separation to obtain the lithium-ion battery cathode material. Adding sodium carbonate, heating and drying to obtain lithium carbonate precipitate. And adding a carbon source and alcohol into the SiO2-coated iron phosphate precipitate particles and lithium carbonate, carrying out ball milling, taking out, drying, and calcining in a protective atmosphere to obtain the positive electrode composite material. Compared with the prior art, according to the prepared positive electrode composite material, material particles contain a lithium silicate network, so that the specific discharge capacity of a battery material is effectively improved. The method is simple in process and suitable for comprehensive utilization of waste batteries.

The invention provides a preparation method of an acid-resistant and chlorine-corrosion-resistant porous composite electrode and a device constructed on the basis of the electrode and used for preparing hydrogen and chlorine by electrolyzing a sodium chloride solution, two cavities are provided, an acid or neutral saturated sodium chloride solution is filled in the cavities, the cavities are separated by a proton exchange membrane or a diaphragm, and the proton exchange membrane or the diaphragm is filled in the cavities. And in the electrolysis process, the cathode generates high-purity hydrogen, the anode generates high-purity chlorine, the chlorine is absorbed by sodium hydroxide in the gas collection bottle and generates sodium hypochlorite, or the chlorine is introduced into a sodium bromide / sodium iodide solution to replace bromine / iodine elementary substances, and the chlorine is discharged from the gas collection bottle. The sodium hypochlorite solution and the bromine / iodine water are used for disinfection and sterilization experiments. The corrosion-resistant porous composite electrode for electrolysis of an acidic or neutral saturated sodium chloride solution is prepared, the electrolysis voltage of the corrosion-resistant porous composite electrode is further reduced by loading a cathode / anode catalyst, and an acidic or neutral saturated sodium chloride solution electrolysis device constructed based on the electrode can be used for preparing high-purity hydrogen and chlorine.

The invention discloses a composite water purifying agent based on polyaluminum ferric sulfate. The preparation process comprises the following steps: 1, reacting ferrous sulfate heptahydrate, aluminum sulfate, sodium chlorate, phosphoric acid and the like to prepare a polyaluminum ferric sulfate solution; 2, mixing the modified polyacrylamide solution with the polyaluminum ferric sulfate solution for reaction to obtain a composite system; and step 3, adding acidic ochre soil into the composite system to obtain the composite water purifying agent. The preparation method has the beneficial effects that a modified monomer is prepared through organic synthesis, and the modified monomer is copolymerized with monomers such as acrylamide to prepare modified polyacrylamide; then, the organic polymer is compounded with a polyaluminum ferric sulfate solution and acidic ochre soil, and an inorganic-organic-mineral ternary water purification system is constructed; the composite water purifying agent has the high-efficiency electricity neutralization capability of an inorganic flocculating agent, the bridging flocculation effect of organic macromolecules and the adsorption performance of minerals, and shows excellent flocculation and sedimentation effects and pollutant removal capability.

A sodium chlorite synthesis reactor relates to the technical field of reaction devices and comprises a kettle body, a separation cylinder is coaxially and fixedly connected in the kettle body, an inner flow channel is formed through an inner cavity of the separation cylinder, an outer flow channel is formed between the outer wall of the separation cylinder and the inner wall of the kettle body, and the upper and lower ends of the inner flow channel and the outer flow channel are communicated with the inner cavity of the kettle body. A spiral conveying main blade is rotationally arranged in the inner flow channel, a spiral conveying auxiliary blade is rotationally arranged in the outer flow channel, the spiral conveying main blade and the spiral conveying auxiliary blade are synchronously and rotationally arranged, and the thread rotating direction of the spiral conveying main blade is opposite to that of the spiral conveying auxiliary blade. According to the utility model, the problems that in the preparation and synthesis process of sodium chlorite in the prior art, various materials inside are limited by the influence of an internal flow mixing component and easily flow in a fixed direction, so that the various materials cannot be fully stirred and mixed quickly; and raw materials need to be continuously added during the period, so that when the materials are added during the period, internal stimulation gas is easy to leak.

The invention provides a method for synergistically recovering valuable elements from waste ternary lithium battery black powder and a spent automobile catalyst, and belongs to the technical field of solid waste recycling. The method comprises the following steps: mixing waste ternary lithium battery black powder, a spent automobile catalyst, coke and a slag former, and sequentially pelletizing and smelting to obtain lithium oxide-containing dust, PGMs-nickel cobalt manganese and smelting slag; carrying out magnetic separation on the smelting slag, and merging the secondarily enriched PGMs-nickel-cobalt-manganese alloy into the PGMs-nickel-cobalt-manganese alloy in the step (1); the PGMs-nickel cobalt manganese alloy, a hydrochloric acid solution and a sodium chlorate solution are mixed and then subjected to acidolysis, the obtained mixed solution is subjected to extraction, reverse extraction and precipitation, and recovery of platinum group metal, lithium and nickel cobalt manganese is achieved. The collaborative recovery method is adopted, the recovery rate of the platinum group metal is larger than or equal to 98%, the recovery rate of lithium is larger than 92%, the recovery rate of nickel-cobalt-manganese resources is larger than or equal to 90%, a new trapping agent does not need to be added in the platinum group metal trapping process, and valuable elements are fully applied.

The invention relates to a preparation method of a cultivation material for cultivating selenium-rich black fungus, which comprises the following steps: respectively preparing a slow-release sodium chlorate composite material and a slow-release selenium-containing mineral material, and then mixing with carbon nutrition, nitrogen nutrition and mineral nutrition to obtain the cultivation material. The slow-release selenium mineral material is a polymer-coated slow-release selenium mineral material prepared by the following steps: preparing a selenium mineral core material from selenium powder, gypsum, calcium superphosphate, monopotassium phosphate, calcium sulfate, diatomite, nano silicon dioxide and a surfactant OP-10, preparing a coating material, adding the selenium mineral core material, and soaking with a Bis-Tris buffer solution. Sodium chlorate and selenium are respectively prepared into specific slow release systems, and are slowly released in the cultivation material to react to generate a seleninic acid component which can be easily absorbed and utilized by the black fungus, so that the concentration of seleninic acid in the cultivation material is regulated, the growth of the black fungus is promoted, the yield of the black fungus is increased, the quality of the black fungus is remarkably improved, and the cultivation cost is reduced. The selenium content and the amino acid content in the black fungus are obviously increased.

The invention relates to the technical field of sewage treatment, in particular to a wastewater recycling method which comprises the following steps: cyanide breaking: in an alkaline environment, adding an oxidizing agent to oxidize wastewater; first monitoring: monitoring the oxidation reduction potential and the free cyanide concentration in real time, and adjusting the adding proportion of sodium hypochlorite based on the ORP dynamic range and the cyanide concentration attenuation rate; precipitation: adding hydroxide, and carrying out heavy metal precipitation; second monitoring: acquiring component information in the sewage, and adding sodium hydroxide and sodium sulfide in a gradient compensation manner after triggering judgment; membrane treatment: performing filtration and degradation treatment through a biological membrane; 3, monitoring: dynamically adjusting the aeration intensity and the backwashing period according to the coupling relationship between the pressure difference slope and the sludge concentration; and 4, monitoring: calculating a process capability index, judging whether the process capability index is smaller than a third threshold value, and if so, adjusting the sodium sulfide dosage in the precipitation stage. The method has the effect of reducing resource waste in the wastewater treatment process.

The utility model relates to the field of stirring for preparing sodium hypochlorite, and discloses stirring equipment for preparing sodium hypochlorite, which comprises a stirring tank, a stirring cover is arranged at the top of the stirring tank, a stirring assembly is arranged in the stirring tank, a cleaning assembly is arranged in the stirring tank, and the stirring assembly comprises a first connecting frame. The outer side of the first connecting frame is fixedly connected to the outer side of the stirring tank, a first rotating shaft is rotatably connected to the interior of the first connecting frame, a second belt wheel is fixedly connected to the outer side of the first rotating shaft, a square rod is slidably connected to the interior of the first rotating shaft, and a stirring rod is fixedly connected to the outer side of the square rod. According to the material mixing device disclosed by the utility model, through mutual cooperation of structures such as the motor, the rotating shaft, the rotating shaft I, the square rod, the stirring rod and the roller, effective coverage in the horizontal circumferential direction and the vertical direction is realized, and the uniformity and sufficiency of material mixing are greatly improved; the rapid and uniform mixing of chlorine and a sodium hydroxide solution in the sodium hypochlorite preparation process is facilitated.

The invention relates to the technical field of chemical preparations, in particular to a sodium hypochlorite stabilizer, a preparation method and a use method thereof and a stable sodium hypochlorite solution. The sodium hypochlorite stabilizer is prepared from the following components in percentage by mass: 2.5 to 3.5 percent of sodium diethylenetriamine pentaacetate, 2.5 to 3.5 percent of disodium ethylene diamine tetraacetate, 1.0 to 1.25 percent of sodium silicate, 3.5 to 5.0 percent of sodium bicarbonate, 2.5 to 3.0 percent of sodium chloride and the balance of water. The stable sodium hypochlorite solution prepared by adopting the sodium hypochlorite stabilizer disclosed by the invention is higher in stability and longer in validity period.

The utility model relates to the technical field of sewage treatment, in particular to a production system for preparing sodium hypochlorite through electrolysis, which comprises a soft water preparation module, a salt dissolving module, a generator module, a storage module, a feeding module and a pickling module, and the soft water preparation module is respectively connected with the salt dissolving module and the generator module. The soft water preparation module provides soft water for the salt dissolving module and the generator module, saline water output by the salt dissolving module and the soft water conveyed to the generator module by the soft water preparation module are mixed into diluted saline water, then the diluted saline water is input into the generator module, and the generator module electrolyzes to generate a sodium hypochlorite solution and inputs the sodium hypochlorite solution into the storage module. The generator module is further connected with an acid pickling module, the acid pickling module is used for inputting acid liquor into the generator module to clean the generator module, excessive scaling of the generator module is avoided, the production efficiency of the generator module is guaranteed, and the overall production efficiency of the production system is also guaranteed and improved.

The invention discloses a preparation method and application of chlorine dioxide preservative paper.The preparation method comprises the steps that starch, nanocellulose, hydrogen peroxide, ferric sulfate, distilled water and sodium hydroxide are mixed to obtain gelatinized starch, and then the gelatinized starch is mixed with water-based acrylic resin, casein, alkyl glycoside and ammonium persulfate to obtain composite starch glue; mixing sodium chlorite and composite starch glue to obtain fresh-keeping coating liquid A, and then coating the fresh-keeping coating liquid A on fresh-keeping base paper to obtain fresh-keeping coating liquid A paper; citric acid and distilled water are mixed to obtain fresh-keeping coating liquid B, and then fresh-keeping base paper is soaked in the fresh-keeping coating liquid B to obtain fresh-keeping coating liquid B paper; the fresh-keeping coating liquid A paper and the fresh-keeping coating liquid B paper are attached to obtain the chlorine dioxide fresh-keeping paper. The chlorine dioxide fresh-keeping paste is pasted on the inner side of the blueberry packaging box cover to keep the blueberries fresh. The chlorine dioxide preservative paper prepared by the invention can solve the problems of burst release and short retention time of chlorine dioxide, can reduce the problems of easy softening, rot and deterioration of picked blueberries, prolongs the shelf life of the blueberries, and improves the commodity value of the blueberries.

The invention relates to the technical field of sodium hypochlorite production, and discloses an efficient mixed sodium hypochlorite production reaction kettle with an automatic cleaning function, the efficient mixed sodium hypochlorite production reaction kettle comprises a reaction kettle, a mixing mechanism and an auxiliary mechanism, the left side and the right side of the top of the reaction kettle are each fixedly provided with an inlet pipe, and one end of each inlet pipe penetrates through and extends into the reaction kettle; a fixed box is fixedly mounted at the top of the reaction kettle; the mixing mechanism comprises bearing seats fixedly mounted on the left side and the right side of the top of the inner cavity of the fixed box, and transmission rods are movably mounted at the bottoms of the bearing seats. According to the efficient mixed sodium hypochlorite production reaction kettle with the automatic cleaning function, sodium hypochlorite can be fully mixed through the mixing mechanism and the auxiliary mechanism, an arc-shaped stirring rod is lowered to be in contact with the bottom in the reaction kettle through a rotating rod, and then a servo motor is started; sodium hypochlorite attached to the inner wall and the bottom of the reaction kettle and the outer surface of the rotating rod can be brushed down through the cleaning brush, and the good cleaning effect is achieved.

The invention relates to the field of stripping hanger liquid processing, in particular to environment-friendly stripping hanger liquid and a preparation process thereof. The cleaning agent is prepared from the following raw materials in percentage by weight: 10-15% of sulfuric acid, 3-6% of tetrasodium hydroxyethylidene diphosphate, 4-6% of sodium alcohol ether sulphate, 4-8% of N-methyl-2-pyrrolidone, 4-9% of cyclohexanol, 1-2% of phenolsulfonic acid, 4-7% of sodium hypochlorite, 5-9% of hydrogen peroxide, 3-4% of ferrous sulfate, 1-3% of sodium chloride, 4-8% of a wetting agent, 0.5-0.8% of a stabilizer, 2-3% of a thickening agent, 2-3% of a penetrant and the balance of pure water. Mild chemical components adopted in the formula replace strong nitric acid and strong alkali components in a traditional hanger stripping solution, the corrosivity of the hanger stripping solution is reduced, all the raw materials meet the environment-friendly requirement, and harmful substances cannot be generated in the production and use process, and the environment cannot be polluted.

The invention relates to the technical field of precious metal recovery, in particular to a process for separating precious metal from copper-nickel smelting waste, which comprises the following steps: crushing and grading the waste, adding a sulfuric acid solution containing etidronic acid, leaching, and washing, drying and crushing filter residues to obtain a pretreated material; mixing the pretreated material with a sodium peroxide-sodium carbonate composite flux, roasting, leaching with water, and filtering to obtain a filter residue B; adding a leaching agent containing hydrochloric acid, sodium chlorate and 1, 2-cyclohexanediamine tetraacetic acid into the filter residue B according to the ratio of 1: 3-1: 5, and filtering to obtain filtrate C and filter residue C; adjusting the pH value of the filtrate C to 1.5-2.5, adding an ethanol solution of sodium N, N-diethyldithiocarbamate, precipitating, washing and calcining to obtain sponge palladium; adding ammonium chloride into the filtrate D, precipitating and calcining to obtain sponge platinum; and leaching the filter residue C by using a hydrochloric acid-chloroauric acid mixed solution containing diphenylthiourea, and replacing and calcining zinc powder to obtain crude gold. According to the process, the leaching rates of platinum, palladium and gold and the product purity are greatly improved; flux and reagent systems are optimized, consumption and energy consumption are reduced, waste liquid treatment is matched for up-to-standard discharge, and efficient resource recovery and environment-friendly cooperation are achieved.

The invention relates to the technical field of wood manufacturing, in particular to a preparation method of a multifunctional phase-change transparent wood-based composite material, which comprises the following steps: delignification of wood through acidic sodium chlorite, modification with silica sol to obtain a porous template, dipping in a PEG / MMA / AIBN / acetone mixed solution, and hot press molding to obtain a phase-change transparent base material; and finally, coating a PDMS solution containing cesium tungsten bronze and strontium aluminate, and performing low-temperature drying twice to obtain the multifunctional composite material. Silica sol pretreatment is combined with a PEG / MMA impregnation and compression technology, the preparation process is simple and easy to implement, leakage of the phase change material can be effectively prevented, meanwhile, the stability and performance consistency of the composite material are improved, the material is suitable for large-scale production, meanwhile, cesium tungsten bronze and strontium aluminate are introduced, the material is endowed with hydrophobicity, light-emitting characteristics and heat shielding capacity, and the material is suitable for large-scale production. And the intelligent building has the functions of photo-thermal management, self-cleaning and decoration, so that diversified application requirements are met.

The invention discloses porous chlorine dioxide slow-release preservative paper and a preparation method thereof.The porous chlorine dioxide slow-release preservative paper comprises a paper base, a porous carrier is fixed to the paper base through oxidized starch glue, and sodium chlorite, an activating agent and a stabilizing agent are loaded on the porous carrier; the porous carrier is one of aluminum oxide, titanium oxide, cobalt oxide, zinc oxide, copper oxide, iron oxide, cerium oxide, zirconium oxide, nickel oxide, manganese oxide, praseodymium oxide and lanthanum oxide with a porous structure. The slow release of chlorine dioxide can be stably and effectively realized, the release period of chlorine dioxide is prolonged, and long-acting stable sterilization and disinfection effects are realized.

The invention discloses a preparation method of a high-curability environment-friendly dust suppression material, which is characterized by comprising the following steps: (1) weighing locust bean gum, putting the locust bean gum into a container, adding water, uniformly stirring, adjusting the pH value to 2-3 by using hydrochloric acid, adding sodium hypochlorite, heating to 50-60 DEG C, and reacting for 1-2 hours to obtain a mixed solution I; (2) adding waterborne polyurethane into the mixed solution I, heating to 60-80 DEG C, reacting for 1-1.5 hours to obtain a mixed solution II, adding erythritol, and sufficiently and uniformly mixing to obtain a mixed solution III; and (3) cooling the mixed solution III to room temperature, adjusting the pH value of the solution to be neutral, and adding a surfactant into the mixed solution III to obtain the dust suppressant solution. The mechanical property of the dust suppressant is improved, the evaporation rate of water can be reduced, a cured layer is prevented from cracking, the lasting time of the dust suppression effect is prolonged, and the need of repeatedly applying the dust suppressant is reduced.

To provide a method and an apparatus for producing a sodium hypochlorite solution on-site at a high efficiency and at the initial cost and suppressing operating cost without any problems about impurities derived from raw material water and raw salt. A method of producing a sodium hypochlorite solution on-site in the vicinity of a physical plant where a sodium hypochlorite solution is used. In production of a sodium hypochlorite solution by feeding secondary salt water, in an electrolyzer comparted into an anode chamber and a cathode chamber with an ion-exchange membrane, to the anode chamber and allowing components in the anode chamber and the cathode chamber after electrolysis to react in a reaction tank, there are included respective steps of treating raw material water A with a cation-exchange resin B to generate purified water 5, dissolving raw salt D in the purified water to generate primary salt water E, performing an examination for confirming the presence or absence of a precipitate or suspended solid in the primary salt water, and directly performing chelating in the case of no precipitate or suspended solid contained in the primary salt water, or performing chelating after addition of an acid component for dissolution of the precipitate or suspended solid in the case of the precipitate or suspended solid contained therein, to generate secondary salt water 4.

The present invention relates to the field of fresh-keeping technology, and in particular to a fruit, vegetable and flower fresh-keeping package. The fruit, vegetable and flower fresh-keeping package is prepared from the following components: sodium chlorite, a modified activator, an ethylene inhibitor and auxiliary materials, wherein the modified activator is obtained by encapsulating an organic acid activator with sulfonated β-cyclodextrin and then encapsulating chitosan. The fruit, vegetable and flower fresh-keeping package provided by the present invention realizes efficient and long-term fresh-keeping of fruits, vegetables and flowers, and has broad market potential and application prospects.

The invention relates to a BIPB synthesis method, which is characterized by comprising the following steps: S1, raw material feeding: adding tert-butyl hydroperoxide into a reaction flask, adding di-(2-hydroxyisopropyl) benzene under a stirring condition, fully reacting, and adding trifluoromethanesulfonic acid; step S2, condensation reaction: after the trifluoromethanesulfonic acid is completely added and fully reacts, adding water to terminate the reaction, and standing after stirring at controlled temperature; s3, post-treatment alkali washing: separating the reaction liquid after standing, retaining an upper organic phase, sequentially carrying out alkali washing and water washing on the organic phase, discharging reaction wastewater in a layered manner, retaining the upper organic phase, pouring out the organic phase, cooling, solidifying the organic phase, and crushing to obtain a finished product. Compared with the prior art, the preparation method has the advantages that trifluoromethanesulfonic acid is used as the catalyst, no auxiliary means are needed, side reactions and harmful substances generated by reaction of sulfuric acid, sodium perchlorate and the like are avoided, higher-quality BIPB can be obtained, the yield of BIPB is increased, the preparation method is safer and more environmentally friendly, and the cost is greatly reduced.

The invention belongs to the technical field of water treatment, and relates to a method for removing new pollutants in water by using a far ultraviolet assisted sodium hypochlorite system. The method comprises the following steps: S1, adjusting the pH value of a to-be-treated aqueous solution containing new pollutants to 4-10; s2, adding a sodium hypochlorite oxidizing agent into the aqueous solution to be treated and continuously stirring; and S3, carrying out a reaction under the ultraviolet wavelength of 200 to 230 nm. Compared with the prior art, the method has the advantages that the far ultraviolet light source and the sodium hypochlorite are jointly applied, so that the oxidation capacity of the sodium hypochlorite is improved, meanwhile, the high-energy characteristic of far ultraviolet light is fully played, efficient photocatalytic degradation of new pollutants difficult to degrade is realized, and the overall water treatment efficiency is remarkably improved.

The invention provides a porous high-wettability lithium battery diaphragm. The porous high-wettability lithium battery diaphragm comprises a polyolefin diaphragm and a polymer material loaded on the polyolefin diaphragm, the polymer material is obtained by adding imidazole or thiazole organic small molecules into an oxidizing agent solution for hydrothermal reaction and then adding ferric salt for polymerization reaction, and oxidizing agents are sodium hypochlorite, sodium chlorite and hydrogen peroxide. The polymer material provided by the invention has a hydrophilic group and a porous structure, and the polymer material is loaded on the polyolefin diaphragm, so that the wettability of the diaphragm is effectively improved, and the ion transfer rate in the charging and discharging process of the lithium ion battery is improved.

The invention relates to a method for efficiently and selectively extracting vanadium from vanadium shale. According to the technical scheme, the method comprises the steps that vanadium shale is crushed and ground, vanadium shale mineral powder is obtained, a sulfuric acid solution I and the vanadium shale mineral powder are mixed, mixed ore pulp is obtained, a leaching aid is added for pulp mixing, stirring and solid-liquid separation are conducted, and vanadium-containing leaching liquid and leaching residues are obtained; adding sodium sulfite into the vanadium-containing leaching solution, heating and stirring to obtain a reduced solution; adjusting the pH value of the reduced solution, and carrying out solid-liquid separation to obtain an extraction stock solution and neutralization slag; mixing the extraction organic phase and the extraction stock solution, performing countercurrent positive extraction, mixing the obtained loaded organic phase and a stripping agent, and performing countercurrent reverse extraction to obtain a vanadium-rich solution; adding sodium chlorate into the vanadium-rich solution, heating and stirring to obtain an oxidized solution, adjusting the pH value of the oxidized solution, and carrying out hydrothermal reaction and solid-liquid separation to obtain a vanadium precipitation mother solution and a vanadium precipitation intermediate product; and roasting the vanadium precipitation intermediate product to obtain vanadium pentoxide. The method is high in vanadium leaching rate, low in concentration of impurity iron in the extraction solution, short in extraction stage and high in product purity.

The utility model provides a continuous production device of sodium hypochlorite. The continuous production device comprises a first reaction tower, a second reaction tower, a tail gas absorption tower, a sodium hypochlorite finished product tank, a sodium hypochlorite circulating tank and an alkali liquor storage tank which are communicated, the first reaction tower is communicated with a chlorine pipeline, the first reaction tower, the second reaction tower and the tail gas absorption tower are communicated with a sodium hypochlorite circulating tank through a heat exchanger, and liquid outlet pipelines of the first reaction tower, the second reaction tower and the tail gas absorption tower are respectively provided with a first ORP detector, a second ORP detector and a third ORP detector; a sodium hypochlorite finished product valve is arranged on a liquid inlet pipeline of the sodium hypochlorite finished product tank, a sodium hypochlorite circulating valve is arranged on a liquid inlet pipeline of the sodium hypochlorite circulating tank, and the first ORP detector, the second ORP detector and the third ORP detector are respectively linked with the sodium hypochlorite finished product valve and the sodium hypochlorite circulating valve. The device can monitor the temperature and the ORP value of the circulating liquid in real time, the quality and the production efficiency of the sodium hypochlorite solution are greatly improved, and labor is saved.

The invention belongs to the technical field of sodium hypochlorite production, and particularly relates to a method for producing sodium hypochlorite. A method for producing sodium hypochlorite comprises the following steps: adding a compound additive into a sodium hydroxide aqueous solution, and uniformly stirring to obtain a compound alkali-containing raw material solution; respectively introducing the composite alkali-containing raw material solution and chlorine into the micro-channel reactor through a metering pump, and controlling reaction conditions to generate a reaction solution containing sodium hypochlorite; introducing the reaction liquid into a ceramic membrane separation device, separating and removing unreacted solid impurities and by-product salts, and collecting permeate; unreacted sodium hydroxide is recycled and reused; and detecting the permeate liquid to be qualified to obtain a sodium hypochlorite finished product. According to the invention, four key links of compound additive addition, microchannel reaction, ceramic membrane separation and resin recovery are organically linked to form a systematic solution. Aiming at the core pain points of insufficient reaction, more byproducts, raw material waste, equipment corrosion and the like in the traditional process, the product purity is improved through the synergistic effect of all links.

The invention relates to the technical field of precious metal recovery, in particular to a method and system for recovering gold, silver, palladium and platinum from silver anode slime. S2, palladium precipitation: adding a potassium-magnesium mixture and sodium chlorate into the pre-impregnation liquid obtained in S1 to obtain palladium precipitation residues and platinum precipitation liquid; s3, separating gold; s4, platinum and palladium precipitation: adding a potassium-magnesium mixture and sodium chlorate into the gold separation liquid obtained in S3 to obtain platinum and palladium precipitation residues and platinum and palladium precipitation post-liquid; s5, gold is reduced; s6, platinum and palladium separation, wherein hydroxylamine hydrochloride is added into the platinum and palladium precipitation residues obtained in the step S4, and palladium separation liquid and platinum precipitation residues are obtained; 7, platinum purification, wherein hydroxylamine hydrochloride is added into the platinum precipitation residues obtained in the step 6, and platinum separation liquid is obtained; s8, carrying out primary palladium deposition; s9, carrying out secondary palladium deposition; and S10, palladium is reduced. The recovery rate of palladium is 99% or above, the recovery rate of platinum is 99% or above, the purity of platinum is 99.9%, the purity of palladium is 99.95%, the recovery rate of silver is 98.5% or above, and the recovery rate of gold is 99% or above.

The utility model discloses sodium perchlorate production equipment with a mechanical stirring mechanism, which relates to the field of sodium perchlorate production and comprises a transparent glass shell, a first funnel is fixedly mounted at the top end of the transparent glass shell, and a funnel-shaped filter plate is fixedly mounted at the bottom end in the first funnel. The device comprises a transparent glass shell, a hollow cylinder part is arranged in the transparent glass shell, a spiral auger is fixedly installed in the hollow cylinder part, a central column is fixedly installed in the middle of the spiral auger, and a conical part is fixedly installed at the top end of the central column. In the reaction, the collecting shell can continuously collect impurities and spirally convey the impurities to the upper surface of the hopper-shaped filter plate for filtering, and the solution is conveyed together during conveying, so that the dissolving area of chlorine in water can be increased, the efficiency of chlorine participating in the reaction is improved, the yield is further improved, the workload of workers is reduced, and the automation degree of the device is improved.

The application discloses porous chlorine dioxide slow-release preservative paper and a preparation method thereof. The paper comprises a paper base, a porous carrier is fixed on the paper base through oxidized starch glue, sodium chlorite, an activator and a stabilizer are loaded on the porous carrier, and the porous carrier is one of porous structures of aluminum oxide, titanium oxide, cobalt oxide, zinc oxide, copper oxide, iron oxide, cerium oxide, zirconium oxide, nickel oxide, manganese oxide, praseodymium oxide and lanthanum oxide. The application can stably and effectively realize slow release of chlorine dioxide, prolong the release period of chlorine dioxide, and realize long-acting and stable sterilization and disinfection.

The application provides a zinc phosphide negative electrode material, which comprises a zinc sheet substrate and a zinc phosphate protective layer; the zinc phosphate protective layer is obtained in situ on the surface of the zinc sheet by immersing the zinc sheet in a phosphoric acid solution; the phosphoric acid solution comprises phosphoric acid, zinc oxide, sodium fluoride, zinc nitrate, sodium perchlorate, organic ammonium and ammonia water. The zinc phosphide negative electrode material has good reversible deposition / dissolution performance, excellent energy storage performance, high stability and can be stably cycled for a long time.

The invention relates to a wide temperature range electrolyte for a sodium battery. The electrolyte comprises a sodium salt and an organic solvent, the sodium salt is one or more of sodium hexafluorophosphate, sodium perchlorate, sodium tetrafluoroborate, sodium bis (fluorosulfonyl) imide, sodium bis (trifluoromethylsulfonyl) imide, sodium trifluoromethanesulfonate, sodium difluoro (oxalato) borate and sodium bis (oxalato) borate, and the organic solvent is one or more of 1, 2-diethoxyethane or 1, 2-diethoxyethane. The invention relates to a combination of 1, 2-diethoxyethane and tetrahydrofuran. The wide-temperature-range electrolyte provided by the invention has the advantages of high boiling point, low freezing point, low viscosity, high ionic conductivity and the like, and the solvation effect of the electrolyte solvent and sodium ions is weak, so that the desolvation energy barrier of the sodium ions is reduced, the desolvation energy and charge transfer resistance of the sodium ions on a positive and negative electrode interface are reduced, and the service life of the electrolyte is prolonged. The electrolyte can significantly improve the high and low temperature charge and discharge performance and cycle performance of the sodium battery, and can safely and stably operate in a wide temperature range of-70-60 DEG C.