27results about How to "Increase oxidation rate" patented technology

The invention belongs to the technical field of semiconductor manufacturing, and particularly relates to an ultraviolet light catalysis assisted gallium nitride wafer polishing method which comprises the following steps: S1, fixing a ground and flushed gallium nitride wafer on a clamp of a polishing machine; s2, the sealed cabin of the polishing machine is vacuumized until the vacuum degree reaches a set vacuum degree threshold value, and then the sealed cabin is filled with oxygen until the pressure value of the oxygen in the sealed cabin reaches a set pressure threshold value; s3, an ultraviolet lamp and a heater are turned on, the ultraviolet lamp irradiates the polishing solution, the heater heats the polishing solution to a set temperature and keeps the temperature constant, and then the polishing machine is started to polish the gallium nitride wafer; and S4, cleaning the polished gallium nitride wafer. According to the method, the oxidation rate is increased, and the polishing efficiency of the gallium nitride wafer is further improved.

The utility model discloses a battery-grade manganous-manganic oxide preparation system which comprises a reaction kettle as well as a first storage tank, a second storage tank and a third storage tank which are connected with a feeding hole of the reaction kettle, the first storage tank is used for storing a slow-release agent, and a first feeding pump is arranged on a conveying pipe, connected with the reaction kettle, of the first storage tank; the second storage tank is used for storing a manganese sulfate solution; a second feeding pump is arranged on a conveying pipe for connecting the second storage tank and the reaction kettle; the third storage tank is used for storing alkali liquor, and a first feeding pump is arranged on a conveying pipe, connected with the reaction kettle, of the third storage tank; the reaction kettle is also connected with an oxidizing agent conveying pipe; a control valve is arranged on the oxidizing agent conveying pipe; a sampling port is formed in the reaction kettle and is connected with the particle size analyzer and the pH monitor respectively; a discharge hole is formed in the bottom of the reaction kettle. According to the utility model, the battery-grade manganous-manganic oxide product with higher purity and better performance can be obtained while the particle size is controlled.

The method comprises the following steps that the lithium slag is sequentially subjected to first magnetic separation treatment, ore grinding treatment and second magnetic separation treatment, and iron concentrate and magnetic separation treatment tailings are obtained; the magnetic separation treatment tailings are sequentially subjected to first-stage acid treatment and second-stage acid treatment, and iron-removed and desulfurized lithium slag is obtained; wherein the acids used in the first-stage acid treatment are citric acid and hydrochloric acid, and the acids used in the second-stage acid treatment are citric acid and nitric acid. According to the method, two times of high-strength magnetic separation and two times of acid treatment are combined, the removal process of iron and sulfur in the lithium slag is optimized, and the iron removal and sulfur removal efficiency is remarkably improved.

The invention provides a preparation method of high-temperature-resistant polyacrylonitrile-based carbon fiber and application of the high-temperature-resistant polyacrylonitrile-based carbon fiber in fireproof fabric. 2-acrylamido-2-methylpropanesulfonic acid is added, so that the limit oxygen index of the pre-oxidized fiber is increased, and the fireproof performance is enhanced; the coalescence rate of the pre-oxidized fibers is reduced by dipping perfluorolaurinol polyoxyethylene ether and spraying carbon powder; by spraying the basic aluminum chloride, the crimp number of the pre-oxidized fiber is increased, and the flexibility is improved; hydrogen bromide is added into oxygen, so that the oxidation rate and the limit oxygen index are improved; a pre-oxidation reaction is carried out in a radiation heating mode, and formation of a skin-core structure is inhibited; tar-shaped impurities deposited on the surfaces of the pre-oxidized fibers are removed under the action of ultrasonic waves, so that the quality of the carbon fibers is improved; the pre-oxidized fibers are treated through beta-anthraquinone sodium sulfonate, oxygen absorbed by the pre-oxidized fibers is removed, and the tensile strength of the carbon fibers is improved; therefore, the high-temperature-resistant and high-strength carbon fiber is prepared and is applied to a fireproof fabric.

The invention discloses a non-carbonized lead metallurgical device and method, and belongs to the field of non-carbonized lead metallurgy. The non-carbonized lead metallurgical device comprises a metallurgical equipment shell, a low-temperature heating chamber is formed in the metallurgical equipment shell, an exhaust chamber is further formed in the metallurgical equipment shell, and a material fishing rod is further arranged in the low-temperature heating chamber; the material fishing rod can fish flying materials in the low-temperature heating chamber into the high-temperature reduction chamber, and a turning-up assembly for turning over the materials at the bottom of the low-temperature heating chamber is arranged in the low-temperature heating chamber. According to the device, the turning-up assembly is arranged, the turning-up assembly can push up lead sulfide particles to enable the lead sulfide particles to fly in the low-temperature heating chamber, the heating uniformity of the lead sulfide particles can be improved in the process, part of the lead sulfide particles which cannot be in complete contact with oxygen can fully react with the oxygen, and therefore within the same oxidation time, the lead sulfide particles can be fully oxidized. More lead sulfide particles can be oxidized, the oxidation rate is effectively increased, and the oxidation efficiency of lead sulfide can be effectively improved in this way.

The wastewater treatment system comprises a wastewater treatment tank mechanism, and the wastewater treatment tank mechanism comprises a main tank body base, a main tank body, an auxiliary tank base, an auxiliary tank body, a heating opening, a liquid inlet, an auxiliary tank liquid outlet, a main tank liquid inlet pipe, a liquid inlet control valve, a main tank liquid outlet, a left sealing end cover, a right sealing end cover, a heat preservation layer and a lining layer. The main tank body is fixedly arranged on the main tank body base, the auxiliary tank bodies are fixedly arranged on the main tank body through the multiple sets of auxiliary tank bases, a liquid inlet is fixedly formed in the top of each auxiliary tank body, and a heating opening is formed in the end face of one side of each auxiliary tank body. The whole tank body is optimized for anti-corrosion treatment, so that the production cost of equipment is reduced; the corrosion to the inner wall of the tank body in a wastewater preheating link is improved. The pressure control precision is improved, the oxygen inlet mode is improved, and the phenomenon that the tank body and the pipeline are blocked due to the fact that inorganic salt settles or is attached to the pipe wall due to the long reaction period is reduced.

The invention relates to the technical field of motorcycle exhaust purification, and discloses a motorcycle secondary gulp valve which comprises a valve body protection shell, the right side of the valve body protection shell is fixedly connected with a negative pressure protection shell, and the top face of the valve body protection shell is fixedly connected with an exhaust protection shell. The left side of the valve body protection shell is fixedly connected with an air inlet protection shell, sealing connection assemblies are arranged between the valve body protection shell and the negative pressure protection shell and between the exhaust protection shell and the air inlet protection shell, an exhaust assembly is arranged on the inner side of the exhaust protection shell, and a negative pressure sealing assembly is arranged on the inner side of the negative pressure protection shell. Through the action of the communicating assembly, the valve plate can seal the communicating cavity more quickly, the reed valve is closed in time, the problem of oil accumulation in the valve body caused by reverse flow of exhaust gas of an engine is solved, liquefied gas in the valve body can be volatilized in time, and the air supply flow can be increased; the waste gas emission is improved.

The invention discloses a short-cut nitrification-iron coupling sulfur cycle biological denitrification method, and belongs to the technical field of nitrogen-containing wastewater treatment. According to the method, ammonia nitrogen in the wastewater is converted into nitrite by utilizing a domesticated nitrosobacteria agent; then, sulfate reducing bacteria and thiobacillus denitrificans are inoculated into a culture medium containing iron ions or ferrous ions together for domestication to obtain a complex microbial inoculant, and nitrite and nitrate in the wastewater are further removed through the complex microbial inoculant. In a sulfur circulating microorganism system, Fe < 2 + > can promote the activity of a biological denitrification key enzyme in a biological system by forming an iron carrier in the form of FeS, S < 2-> is fixed in the system and prevented from escaping, and when electron donors in the system are insufficient, the Fe < 2 + > can be used as a substitute electron donor for biological denitrification, so that the requirement on an external organic carbon source is reduced, and the energy consumption is reduced. And meanwhile, the impact load resistance of the system can be enhanced. Through sulfate reduction and sulfur autotrophic denitrification and iron coupling, sulfate in wastewater is converted into electron donors, a carbon-nitrogen-sulfur-iron biological co-reaction system is formed, the defects of a single-strain denitrification system are overcome, the denitrification effect is enhanced, and energy consumption and cost are reduced.

This invention discloses an ammonia-based desulfurization system and method based on zoned control, comprising a desulfurization tower, an absorption circulation tank, an ammonia water tank, a washing tank, and a process water tank. The desulfurization tower, from top to bottom, has a flue gas outlet, a demisting section, a second-stage absorption layer, a first-stage absorption layer, and a concentration section. The absorption circulation tank is divided into an upper oxidation tank and a lower absorption circulation section by a partition. The recovered liquid from the first-stage absorption is connected to the absorption circulation section of the absorption circulation tank via a pipeline; the oxidation tank has an aeration pipe connected to the spray inlet of the second-stage absorption via a pipeline; the lower concentration section of the desulfurization tower is connected to the oxidation tank via a liquid delivery pipeline. The washing tank supplies water to the demisting section and the absorption circulation tank; the ammonia water tank replenishes ammonia water to the oxidation tank, the first-stage absorption layer, and the absorption circulation section of the absorption circulation tank. This invention eliminates coupling interference between absorption and oxidation by dividing the tank into zones within the same tank; combined with two-stage absorption and demisting recovery, it effectively controls ammonia escape while ensuring efficient sulfur dioxide removal.

This invention proposes a solar-powered electrocatalytic AOR coupled with biological denitrification for complete nitrogen removal, comprising a solar power unit, an ammonia electrolyzer, and a biological denitrification unit. In the ammonia electrolyzer, the anode and cathode are connected to the positive and negative terminals of the solar power unit, respectively. The anode includes a conductive substrate and a heteroatom-doped nickel-based metal catalyst loaded on it. Solar power reduces energy consumption, and the battery allows for continuous operation even at night, extending the unit's lifespan. The solar-powered electrocatalytic AOR coupled with biological denitrification provided by this invention has a reasonable design, uses a low-cost conductive substrate as the catalytic electrode, has a simple preparation method, is easy to scale up, is highly efficient, and produces green and pollution-free products. It achieves a nitrogen removal efficiency of over 98%. Electrocatalytic ammonia oxidation combined with multiple electrode sets accelerates the ammonia oxidation process, saving significant time and costs and enhancing ammonia nitrogen treatment capabilities.

The invention provides a method for improving the biological manganese oxidation performance of manganese oxidizing bacteria and application, and belongs to the technical field of sewage treatment. According to the method, the biological manganese oxidation performance of the manganese oxidizing bacteria is improved by adding the biochar, and after the biochar is added into the manganese oxidizing bacteria, the divalent manganese is added, so that the oxidation rate of the divalent manganese can be obviously improved, and the removal efficiency of heavy metals in the wastewater is improved. Wherein the biochar can be used as an electron shuttle, so that the transfer capability of electrons can be improved, and the oxidation rate of divalent manganese can be increased; the biochar also improves the gene abundance and expression ability of the manganese-oxidizing bacteria and the extracellular superoxide concentration, improves the biological activity of the manganese-oxidizing bacteria, and accelerates the oxidation of divalent manganese. Moreover, the biochar is wide in source and low in cost, resource recycling can be achieved, meanwhile, the treatment cost is reduced, and the biochar is easy to prepare and put and convenient to use in practical application.

The application discloses a kind of cooperation expired medicine, bauxite iron recovery method of pharmaceutical wastewater, comprising the following steps: S1, bauxite is crushed, grinds, and then mixed with hydrogen peroxide solution, and bauxite slurry is prepared;S2, the expired medicine, pharmaceutical wastewater after crushing is added in bauxite slurry, and is prepared as reaction raw material;S3, after stirring, reaction raw material is added in high temperature and high pressure reaction kettle, and after reaching supercritical state, electric heating is closed, and reaction is carried out by relying on oxidation self-heating until end;S4, after cooling, gas-liquid separation is carried out, and liquid-solid mixture is carried out magnetic separation, and Fe3O4 is recovered.The application realizes the dealkalization treatment of bauxite, and the iron in bauxite is stably recovered, and the remaining solid components can be better utilized, and due to the supercritical water oxidation on organic matter super strong oxidizability, the expired medicine in system is completed harmless degradation, and the heat generated by organic matter oxidation is relied on to reduce energy consumption cost.

The invention discloses a sulfur and nitrate synergistic removal material, a preparation method and application, and the preparation method of the sulfur and nitrate synergistic removal material comprises the following steps: uniformly mixing CaO, NH4HCO3, feldspar minerals and a high-molecular carboxyl polymer in an organic solvent, and carrying out ball milling to obtain a desulfurizer; the feldspar mineral is one or more of orthoclase, albite, anorthite, baryta feldspar, baryta ice feldspar, microcline feldspar and sandite; the organic solvent is one or more of ethanol, isopropanol, normal propyl alcohol and acetone; the high-molecular carboxyl polymer is one or more of vinyl acrylate copolymer, maleic acid copolymer, polyacrylic acid, polyethylene acid and polyamic acid polybutenoic acid. The preparation method of the synergistic sulfur and nitrate removal material is simple, all the materials are mixed and then subjected to ball milling to prepare high-homodisperse and small-particle-size desulfurizer pug, and then desulfurization and denitration of industrial tail gas can be achieved through a spraying device.

The present invention relates to a method for preparing a semiconductor structure and a semiconductor structure, and relates to the field of semiconductor manufacturing technology. The method comprises: providing a substrate, wherein the substrate comprises a gate structure and a first doped region located in the substrate on two opposite sides of the gate structure along a first direction; forming a protective sidewall covering a portion of the first doped region on the outer sidewall of the gate structure; subjecting the first doped region to thermal oxidation treatment to form a sacrificial oxide layer; cleaning and removing the sacrificial oxide layer to obtain an initial groove exposing the bottom surface of the protective sidewall; etching the substrate exposed by the initial groove by adjusting the etching parameters of the etching ions to obtain a reference groove opening directly below the gate sidewall; adjusting the crystal orientation at the opening corner of the reference groove by using ions of a fourth main group element; and after obtaining a sigma groove by wet selective etching of the reference groove and removing a portion of the substrate, forming a stress layer in the sigma groove whose top surface is not lower than the top surface of the substrate, so as to at least accurately control the horizontal spacing between the stress layer and the channel region.

The utility model discloses a cattle farm cow dung and wastewater ecological treatment pond, which belongs to the technical field of livestock breeding and comprises a pond body, a filter box is arranged in the pond body, a cover plate is arranged at the upper end of the pond body, a feeding pipe for feeding materials into the filter box is fixedly arranged at the upper end of the cover plate in a penetrating manner, a turnover plate is hinged to one side of the filter box, and the turnover plate is provided with a water inlet and a water outlet. A cleaning opening matched with the turnover plate is formed in one side of the tank body, and an aeration assembly is arranged in the tank body. The device has the beneficial effects that by arranging the filter box, the overturning plate and the cleaning opening, excrement and liquid excrement are filtered and separated, the overturning plate is opened after the excrement is drained and dried, so that a worker can conveniently clean the excrement, and by arranging the aeration assembly, the liquid excrement is aerated, the content of dissolved oxygen in the liquid excrement is increased, the oxidation rate is increased, and the working efficiency is improved. When the aeration assembly works, gas circularly flows, the flowing rate of air in the pool body is increased, and then the drying efficiency of excrement is improved.

The invention discloses a chamfering device and a chamfering method for intelligently manufacturing a compressor cylinder block, and relates to the technical field of chamfering equipment. The device comprises two device bodies, a fixing table is fixedly installed between the sides, close to each other, in the two device bodies, a storage table is fixedly installed on the front face of the fixing table, a driving mechanism is arranged between the sides, close to each other, in the back ends of the two device bodies, and a machining mechanism is arranged on the outer wall of the driving mechanism in a penetrating mode; an electric threaded rod is rotationally mounted in one end of the front face of the machining mechanism, and a sliding plate penetrates through and is movably mounted on the outer wall of the electric threaded rod. The air dryer is prevented from being eroded by external dirt during standing, the dirt is blown to the chamfering head or the surface of a workpiece during working of the air dryer, scraping is further caused, the chamfering precision is reduced, continuous blowing is achieved during machining, and the situation that workpiece flying wires are attached to the surface of the chamfering head due to high chamfering temperature is effectively avoided.

This invention relates to a method for enhancing the stirring intensity during vanadium extraction, belonging to the field of steel pretreatment. The method includes the following three steps: first, vanadium-containing molten iron is added to a converter; then, a top-and-bottom blowing process is used for smelting; coolant is added according to the composition and temperature at the smelting endpoint; finally, semi-steel is removed from the lance at the smelting endpoint. The top-blown gas is an oxygen-nitrogen mixture, and the total flow rate of the oxygen-nitrogen mixture is 31,000~35,000 Nm³. 3 / h; the oxygen consumption per ton of iron, the top blowing lance position, and the nitrogen consumption per ton of iron are controlled in segments according to the blowing period; the bottom blowing gas is nitrogen, and the nitrogen supply intensity is controlled in segments according to the blowing period. This invention significantly enhances the stirring intensity of the molten pool without significantly increasing the temperature rise rate through the synergistic effect of the high-flow-rate oxygen-nitrogen mixed gas from the top and the variable-flow-rate nitrogen from the bottom, thereby shortening the mixing time and enhancing the slag-metal reaction, further increasing the vanadium oxidation amount and further reducing the TFe content in the vanadium slag.

The invention discloses an application of a germanium-silicon etching solution with a high selection ratio. Specifically, the invention provides an application of the germanium-silicon etching liquid in selective etching of a sacrificial layer in a GAA MOSFET (Good Acrylic Acid Metal-Oxide-Semiconductor Field Effect Transistor) structure. The germanium-silicon etching liquid is prepared from the following components in percentage by mass: 0.1%-5% of fluoride, 5%-70% of an oxidizing agent, 0.1%-2% of an inhibitor and 1%-5% of a buffer component and a solvent, the sum of the mass percents of all the components is 100%, and the mass percents are the mass percents of all the components in the total mass of the germanium-silicon etching liquid; and the inhibitor is an EO-PO polymer. The germanium-silicon etching liquid can selectively accelerate the etching rate of a silicon-germanium alloy, and has a relatively high selection ratio.

This utility model relates to the field of wastewater treatment technology, specifically an ozone disinfection device for wastewater treatment. It includes a reaction chamber with multiple stirring drums fixedly installed inside. A transmission assembly is fixedly installed on the upper surface of the reaction chamber, and a gas distribution assembly is fixedly installed at the lower end of the reaction chamber. The gas distribution assembly includes multiple connecting pipes fixedly installed on the lower surface of the reaction chamber, with multiple gas distribution pipes equidistantly fixed on the outer surface of each connecting pipe. In this utility model, by setting multiple stirring drums inside the chamber, wastewater enters each stirring drum separately for reaction, reducing the cross-sectional area of ​​wastewater in a single space. This facilitates the reaction between ozone and wastewater. Simultaneously, ozone is injected into the wastewater inside the multiple stirring drums at different heights, ensuring that wastewater at different heights directly contacts the ozone, maintaining sufficient ozone exposure for all wastewater levels and accelerating the ozone oxidation rate.

The utility model relates to the technical field of ammonia desulphurization devices, and discloses an ammonia desulphurization device which comprises an absorption tower, a slurry section is arranged at the lower end in the absorption tower, the left side of the absorption tower is connected with a backwash pump, flue gas from a boiler induced draft fan enters the absorption tower, and the back wash pump is connected with a backwash pump. The right side of the lower end of the absorption tower is connected with a pulse pump, the right lower end of the absorption tower is respectively connected to a gypsum dehydration pool and a recycling pool through a slurry pump, a plurality of circulating pumps are connected to the absorption tower, and an air blower penetrates through the absorption tower through an air pipe and is connected to a distribution pool and a pulping pool through a slurry feeding pump; the ammonia-process desulfurization device disclosed by the utility model improves the ammonia utilization rate, improves the efficiency, reduces the energy consumption, reduces the power consumption by more than 10% as compared with the similar desulfurization device, and is high in flue gas load elasticity, good in gas equalizing effect, suitable for different working conditions, high in system stability and high in reliability. The desulfurization efficiency can be adjusted by adjusting the slurry level height to adapt to different coal types and chimney load changes.

The invention discloses a methane-oxidizing nitrogen-fixing bacterium and application thereof, and belongs to the technical field of agriculture. The bacterial strain is preserved in Guangdong Microbial Culture Collection Center on September 25, 2025, the preservation number is GDMCC 67018, and the bacterial strain is named as Methylocystis iwaonis in taxonomy. The bacterial strain can grow by using methane and methanol as a unique carbon source, nitrogen is used as a unique nitrogen source for nitrogen fixation, and the bacterial strain belongs to type II methane-oxidizing bacteria with methane oxidation and nitrogen fixation functions; meanwhile, the gene has a pmoA methane monooxygenase gene and a nifH nitrogenase gene cluster, and has dual metabolic potentials; a relatively high methane oxidation rate can still be kept in a low-nitrogen environment, and an excellent nitrogen self-sufficiency characteristic is shown; the method has potential rice field emission reduction and nitrogen fixation synergistic application value, can be applied to the fields of rice field methane emission reduction, biological nitrogen fertilizer research and development, low-carbon agriculture, carbon-nitrogen coupling cycle regulation and the like, can provide new microbial resources for rice field greenhouse gas emission reduction, and also provides an important theoretical and application basis for development of sustainable agriculture with low nitrogen input.

The invention discloses preparation of a low-density vermiculite-based nano zero-valence confinement iron-manganese composite complex and application of the low-density vermiculite-based nano zero-valence confinement iron-manganese composite complex in advanced treatment of novel pollutants. The preparation method comprises the following steps: firstly, mixing expanded vermiculite mineral powder, manganese-containing nano mineral powder and iron-containing nano mineral powder, vacuumizing and standing; and then reducing and roasting in a hydrogen atmosphere to obtain the vermiculite-based nano zero-valence confinement iron-manganese composite material. And finally, mixing the vermiculite-based nano zero-valent confinement iron-manganese composite material with a thiophene carboxylic acid ligand, vacuumizing and standing to obtain the low-density vermiculite-based nano zero-valent confinement iron-manganese composite complex. The low-density vermiculite-based nano zero-valent confinement iron-manganese composite complex is mixed with persulfate, so that active species mainly comprising sulfate free radicals, hydroxyl free radicals and singlet oxygen can be generated, and novel pollutants can be efficiently catalyzed and degraded.

The present application belongs to the field of steel metallurgy and comprehensive utilization of vanadium-titanium resources, and particularly relates to a method for efficiently extracting vanadium from molten iron with top and bottom composite reinforcement. The technical scheme solves the problems of traditional converter vanadium extraction, such as difficult temperature control, uneven stirring, low vanadium oxidation rate, long converter blowing time, and fluctuation of vanadium slag quality. In the blast furnace tapping stage, modified cold solid balls and iron oxides are used as composite solid oxidants to pre-oxidize and extract vanadium using the impact kinetic energy of iron flow and quickly form initial slag. After the molten iron is poured into the vanadium extraction converter, top blowing of nitrogen-oxygen mixed gas and bottom blowing of CO2 are used for sectional stirring and composite reinforcement. No additional cooling agent is added in the converter, and precise temperature control is achieved to realize vanadium extraction and carbon preservation and improve the quality of vanadium slag. The vanadium oxidation rate is stable at ≥92%, the converter blowing time is shortened by more than 30%, the TFe of vanadium slag is reduced, the V2O5 grade is improved, and the efficiency of vanadium extraction and the recovery rate of vanadium resources are significantly improved.

The invention provides a waste gas after-treatment device and method, and particularly provides a methanol fuel engine waste gas after-treatment device and method, the waste gas after-treatment device comprises a first gas inlet pipeline, a catalytic oxidation module, a second gas inlet pipeline, a mixing area, a denitration module and a gas outlet pipeline which are connected in sequence in the waste gas flowing direction; an ammonia spraying component is arranged on the second gas inlet pipeline; a first flow guide cover and a cylindrical barrel with holes in the peripheral side are arranged in the mixing area; the side, close to the ammonia spraying component, of the cylindrical barrel is open, and the side, away from the ammonia spraying component, of the cylindrical barrel is closed; all the modules have a synergistic effect, unburnt methanol, formaldehyde, formic acid, CO and NOx in waste gas are fully converted into harmless CO2, H2O and N2, so that the emission standard of methanol fuel motor vehicles is met, and pollution to the environment is reduced.

The invention discloses a bromine extraction method and application of an improved bromide ion oxidation method, belonging to the technical field of bromine extraction. When the invention is used, the oxidation rate of bromide ions is high, all above 95%, and the yield of bromine is also relatively high, no waste is caused during operation, less power is consumed, the operation cost is low, and the obtained bromine products meet the quality standards of industrial bromine. At the same time, the following technical effects are brought about: providing a low-cost and efficient method for industrial production of bromine without chlorine oxidation, which is safe and environmentally friendly to operate, does not generate a large amount of acidic high-salt wastewater, greatly reduces the production cost of the enterprise, and solves the technical problems existing in the prior art.

The invention discloses a bromide ion electrooxidation electrode and a preparation method and application thereof. The preparation method comprises the following steps: providing a first deposition solution containing a surfactant, fluoride, a transition metal soluble salt and water; electrifying a first electro-deposition system comprising a first working electrode, a counter electrode and a first deposition solution, and performing first electro-deposition on the first working electrode to form a first electro-deposition layer; providing a second deposition solution comprising a surfactant, a transition metal soluble salt, and water; and electrifying a second electro-deposition system containing a second working electrode, a counter electrode and a second deposition solution, and carrying out second electro-deposition on the second working electrode to form a second electro-deposition layer so as to prepare the bromide ion electro-oxidation electrode. The bromide ion electrooxidation electrode provided by the invention is used for electrocatalytic oxidation of bromide ions, and can realize catalytic oxidation of low-grade bromide ions in brine.

The invention discloses a germanium-silicon etching solution with a high selection ratio. Specifically, the germanium-silicon etching liquid provided by the invention consists of the following components in percentage by mass: 0.1-5% of fluoride, 5-70% of an oxidizing agent, 0.1-2% of an inhibitor, and 1-5% of a buffer component and a solvent, the sum of the mass percents of all the components is 100%, and the mass percents are the mass percents of all the components in the total mass of the germanium-silicon etching liquid; and the inhibitor is an EO-PO polymer. The germanium-silicon etching liquid can selectively accelerate the etching rate of a silicon-germanium alloy, and has a relatively high selection ratio.