61 results about "Potassium chlorate" patented technology

The application provides a tantalum-based alloy and a preparation method thereof. The preparation method of the tantalum-based alloy comprises the following steps: sequentially laying a first mixed material, a second mixed material and magnesium chips in a reaction crucible in a top-down direction, igniting the reaction crucible to generate an aluminothermic reduction reaction, and then sequentially performing a temperature reduction treatment and a surface finishing treatment to obtain the tantalum-based alloy. The first mixed material comprises aluminum particles, tantalum pentoxide, titanium oxide, potassium chlorate and aluminum fluoride. The second mixed material comprises aluminum particles, tantalum pentoxide, titanium oxide, potassium chlorate, aluminum fluoride and calcium fluoride. By adopting double dosing and covering the magnesium chips with the upper material, the application improves the ignition efficiency, significantly improves the material loss caused by the slow ignition speed and insufficient ignition of the material in the traditional off-oven method, and introduces a titanium source to form an AlTaTi compound, thereby significantly enhancing the alloy uniformity.

The invention provides an integrated nail shooting primer composition and a preparation method thereof, the integrated nail shooting primer composition comprises the following raw materials: potassium chlorate, antimony trisulfide, lead tetraoxide, fine iron powder, silicon powder and sodium persulfate, the raw materials are prepared, accurately weighed, mixed and stirred, granulated, dried and screened, the dried particles are screened, and too large or too small particles are removed. According to the integrated nail shooting primer composition provided by the invention, the explosion performance can be improved by arranging the Teramine in the potassium chlorate, the antimony trisulfide, the lead tetraoxide, the iron concentrate powder and the silicon powder, the integrated nail shooting primer composition can play a strong explosion role in the fields of military and industrial explosion and the like, and the explosion propagation performance is good; the device can be used for filling detonators and manufacturing booster grains and detonating cords, and the efficiency and safety of blasting operation are improved.

The invention discloses a boiler deashing and decoking agent, and belongs to the field of boiler deashing and decoking. Comprising the following substances in parts by weight: 15-20 parts of sodium carbonate, 5-10 parts of sodium sulfate, 20-25 parts of potassium hydroxide, 12-16 parts of 8-hydroxyquinoline sulfate, 10-15 parts of modified nano silicon dioxide, 1-2 parts of polyvinylpyrrolidone, 3-5 parts of potassium chlorate, 2-6 parts of sodium lignin sulfonate, 3-5 parts of polyoxypropylene triol, 2-4 parts of an ethyl acrylate-acrylonitrile copolymer and 20-30 parts of modified calcium carbonate. The modified nano silicon dioxide can be uniformly dispersed in the medicament by virtue of nano-scale particle size and surface modification treatment, so that the contact area with deposited ash and coke blocks is increased, and the removal efficiency is improved; the polyvinylpyrrolidone is helpful for keeping the components in a good dispersion state in the use process, and agglomeration is avoided; and through the synergistic effect of all the raw materials, a good ash removal and decoking effect can be achieved, so that normal use of the boiler is ensured.

This invention provides a method for producing high-purity aluminum-niobium-tantalum master alloys and co-producing ammonium fluoride, belonging to the fields of metallic materials and inorganic chemicals. The invention involves mixing fluoroniobic acid, fluorotantalic acid, and ammonia water for a precipitation reaction to obtain a precipitate and an ammonium fluoride solution. The ammonium fluoride solution is then concentrated, cooled for crystallization, dehydrated, and dried sequentially to obtain ammonium fluoride. The precipitate is then dried and oxidized and calcined sequentially to obtain an oxide. The oxide, aluminum powder, potassium chlorate, and calcium fluoride are mixed and subjected to a vacuum aluminothermic reaction to obtain the high-purity aluminum-niobium-tantalum master alloy. This invention, considering both broadening the range of raw material selection and optimizing the production process, reacts fluoroniobic acid, fluorotantalic acid, and ammonia water to produce niobium hydroxide and tantalum hydroxide precipitates, which are then oxidized and calcined to form niobium and tantalum oxides. The high-purity aluminum-niobium-tantalum alloy is then prepared using a vacuum aluminothermic reaction. Simultaneously, ammonium fluoride can be co-produced, resulting in high raw material utilization.

The invention discloses an efficient flame-retardant fire extinguishing agent for rapidly extinguishing a lithium battery fire and a preparation formula, and relates to the technical field of fire fighting. The fire extinguishing agent is composed of a liquid-phase component and a solid-phase component, wherein the liquid-phase component comprises ethylene glycol, triethanolamine, fluoroalkyl betaine, sodium dodecyl benzene sulfonate, a phosphate flame retardant, an orange peel extracting solution and purified water; the solid-phase component comprises dodecyl sulfate, ammonium phosphate, potassium perchlorate, sodium carboxymethyl cellulose, polyacrylamide, benzotriazole and the like. The method comprises the following steps: drying and activating solid-phase components after graded crushing, and stirring in a nitrogen atmosphere; carrying out segmented treatment on liquid-phase components, and carrying out ultrasonic emulsification on an orange peel extracting solution; and after solid-liquid mixing, carrying out vacuum defoaming, high-speed shearing dispersion and homogenization treatment. According to the lithium battery fire extinguishing agent, component particle sizes with different dissolution rates are matched through graded crushing, nanoscale dispersion is achieved through ultrasonic emulsification, the bubble residual rate is reduced through vacuum defoaming, and the problems that a traditional lithium battery fire extinguishing agent is low in insulativity, low in cooling efficiency and insufficient in flame retardant efficiency are solved.

The present invention relates to the field of master alloy smelting and discloses a method for improving master alloy yield and reducing gaseous impurities. MgO, CaO, Al2O3, cryolite (Na3AlF6), KCl, and MgCl2 are ground into powder, added with an adhesive, and mixed to form pellets to produce a shielding agent, which is then dried. An ignition agent is prepared using potassium permanganate, aluminum powder, and potassium chlorate in a specific ratio. An oxide, a reducing agent, and a slag-forming agent are uniformly mixed in a specific ratio to prepare a reactant. After the materials are distributed, a reaction is triggered by lower electrical ignition, and the reactant is fully cooled to produce the desired master alloy. The shielding agent isolates the reaction process from air, preventing gaseous impurities from participating in the reaction. This method transforms the conventional off-furnace aluminothermic reduction process into a nearly pure vacuum self-propagating reaction, reducing alloy splashing and achieving an increased alloy yield and a reduced gaseous impurity content.

The invention relates to fire-extinguishing by aerosol flooding, and more particularly to solid-propellant aerosol-forming compositions. The present aerosol-forming composition contains: 1.0-8.0 wt% fuel-binder, 45.0-65.0 wt% first oxidant in the form of an alkali metal nitrate, 10.0-22.0 wt% gas-forming agent, 0.1-5.0 wt% combustion catalyst, 10.0-25.0 wt% second oxidant in the form of potassium perchlorate, and the balance an additive that generates fire retardants. The result is an increase in fire-extinguishing efficiency with a high rate of combustion of the composition.

The invention relates to an energetic material based on a urea-potassium perchlorate eutectic system and a preparation method of the energetic material, and belongs to the technical field of safe and environment-friendly energetic materials. The energetic material based on the urea-potassium perchlorate eutectic system is prepared from the following components in parts by weight: 18 to 35 parts of high-molecular fluorine polymer with the particle size of 50 to 400 microns; 15-40 parts of active metal powder with a particle size of 10-75 [mu] m; 10-30 parts of urea with a particle size of 20-100 [mu] m; 12-35 parts of potassium perchlorate with a particle size of 10-120 [mu] m; 0.5 to 3 parts of a silane coupling agent; 0.5 to 5 parts of a binder; 5 to 10 parts of nano silicon dioxide; 0.5-3 parts of a stabilizer; the urea and the potassium perchlorate are used for constructing a urea-potassium perchlorate eutectic system. According to the energetic material, through co-crystallization treatment of urea and potassium perchlorate, the synergistic effect of an oxidizing agent and a gas generating agent is optimized, and then the problems that a traditional energetic material for emission is large in pollution and poor in safety are solved.

The invention discloses a perovskite solar cell based on potassium chlorate interlayer modification, and belongs to the field of perovskite solar cells. According to the invention, the potassium chlorate intermediate layer is introduced between the transparent conductive substrate and the NiOx hole transport layer, so that the problems of low crystallinity and many defects of the NiOx film caused by magnetron sputtering are solved, O2 generated by decomposition of potassium chlorate can help to improve the ratio of Ni < 3 + > / Ni < 2 + >, the conductivity of NiOx is improved, and the performance of the NiOx film is improved. Therefore, the perovskite solar cell shows excellent photoelectric conversion efficiency. The method is simple in process and compatible with large-area preparation, and a new strategy is provided for efficient and stable perovskite solar cells.

The invention discloses a molybdenum alloy total molybdenum content detection method based on a lead molybdate gravimetric method. The method comprises the following steps: dissolving a ferromolybdenum alloy sample through a nitric acid-potassium chlorate saturated solution and the like, carrying out lead molybdate precipitation through ammonia water, an acetic acid-ammonium acetate buffer solution, lead acetate and the like, carrying out high-temperature gradient sintering on filter residues through a mixed solvent of anhydrous sodium carbonate and zinc oxide, and determining residual molybdenum through a potassium thiocyanate spectrophotometric method after dissolving. And performing correction calculation. According to the method, a gravimetric method and a spectrophotometric method are combined for use, the filter residues are corrected, the precipitation process technology is optimized, the problems that a traditional method is tedious in operation and large in residual molybdenum error of the filter residues are solved, and high-precision, high-efficiency and low-cost molybdenum content detection is achieved.

The invention provides a mixing reactor for preparing potassium perchlorate, and relates to the technical field of chemical equipment, the mixing reactor comprises a tank body assembly, the top of the tank body assembly is provided with a top cover assembly, the center axis position of the top of the top cover assembly is vertically provided with a stirring assembly, and the stirring assembly comprises a stirring main shaft, a driving motor and a quick release flange embedded with the top cover assembly; the top cover comprises a top cover body and a quick-release flange, the quick-release flange is of a double-layer structure, the upper layer and the top cover body are positioned through a bearing, the lower layer and the stirring spindle are positioned in a sleeved mode, and the blade assembly is installed in the middle and at the bottom end of the stirring spindle and sleeved with the surface of the stirring spindle and comprises an installation hoop connected with the stirring spindle in a positioned mode. Stirring blades are symmetrically mounted on the two sides of the mounting hoop, homogenizing holes are uniformly formed in the surfaces of the stirring blades, the homogenizing holes are polygonal holes, burrs are removed from the edges of the stress surfaces of the homogenizing holes, impact grooves are formed in the surfaces of the stirring blades at equal intervals, and the cross section of each impact groove is of a structure with the deep middle and the two gradually shallower sides.

The invention relates to the technical field of electrolytic product treatment, discloses equipment and a method for removing potassium chlorate in electrolytic light salt brine by a formaldehyde catalytic reduction method, and solves the problem of poor removal effect on the electrolytic product potassium chlorate in the prior art. The device comprises a reactor, a mixer, an electrolysis waste brine main pipeline, a plurality of electrolysis waste brine branch pipelines, a hydrochloric acid supply pipe, a formaldehyde supply pipe and a brine discharge pipe, the reactor is connected with the mixer, and the mixer, the hydrochloric acid supply pipe and the formaldehyde supply pipe are all connected with the electrolysis waste brine branch pipelines. The electrolytic waste brine branch pipeline is connected with the electrolytic tank through the electrolytic waste brine main pipeline, the electrolytic waste brine branch pipeline and the electrolytic tank are both connected with the refined brine supply pipe, the brine discharge pipe is connected between the reactor and the electrolytic tank, and the reactor is composed of a shell, a controller, a servo motor, a center supporting sleeve and a mixing and stirring mechanism; by means of the equipment, potassium chlorate in electrolysis products can be efficiently removed.

The invention relates to the technical field of potassium perchlorate wastewater treatment, and discloses a wastewater treatment device for potassium perchlorate preparation, which comprises a pool body for treating wastewater, a plurality of aeration frames mounted at the bottom of the pool body, aeration pipelines mounted in the aeration frames, and a membrane treatment unit mounted at the top of the aeration frames, the membrane treatment unit comprises a membrane frame and a membrane group which is arranged in the membrane frame and consists of a plurality of membranes; a steel shaft body is installed in the aeration frame, a plurality of first spiral blades and second spiral blades are arranged on the steel shaft body, and the first spiral blades and the second spiral blades are connected with the steel shaft body through detachable sleeves. The first spiral blade and the second spiral blade rotate through bubbles generated by aeration, and the first spiral blade and the second spiral blade are arranged in a staggered mode and are designed to be different in diameter, so that the bubbles can be more effectively cut and stirred in the rotating process of the first spiral blade and the second spiral blade.

This invention provides a potassium perchlorate temperature-controlled stirrer, relating to the field of chemical engineering technology. It includes a housing, with a fixed plate fixedly connected to the inner wall of the housing. A motor is fixedly connected to the outer wall of the top of the housing, and a drive rod is fixedly connected to the drive end of the motor. The outer wall of the drive rod is rotatably connected to the inner wall of the housing. This invention employs multiple sets of bevel gears and stirring blades, allowing a single motor to simultaneously drive the stirring blades and stirring rod to rotate in opposite directions. This enables the two parts of the device to stir the solution in reverse, thereby accelerating the stirring rate. Furthermore, the stirring rod is hollow and equipped with an air jet structure, allowing for air jetting into the solution during stirring, further accelerating the reaction rate. Additionally, the stirring blades are adjustable, allowing for changes in their lateral area to increase the stirring range. This provides better stirring results for different stirring conditions, enhancing its practicality.

The invention discloses a method for identifying nitrogen absorption capacity of wheat in a seedling stage based on potassium chlorate culture in combination with field experiments. The method comprises the following steps: (1) screening potassium chlorate with proper concentration; (2) after the seeds of the different wheat varieties germinate, transplanting the seeds into a culture medium containing potassium chlorate with a proper concentration, culturing the seeds to a one-leaf and one-core period, and calculating the growth inhibition ratio of the different wheat varieties so as to evaluate the sensitivity of the different wheat varieties to the potassium chlorate sensitivity; (3) field trials are adopted at the same time, crops of different wheat varieties are planted randomly, the trials take nitrogen fertilizer as main treatment, and three nitrogen element levels are designed in total and are respectively a group without nitrogen fertilizer application, a group with normal nitrogen application and a group with high nitrogen; and in the test process, observing and recording agronomic characters of each test material. According to the method, potassium chlorate screening in the seedling stage is combined with field agronomic character single plant grain weight growth rate comprehensive evaluation, and the efficient nitrogen absorption germplasm can be accurately identified.

The utility model relates to cable technical field discloses a kind of high-strength overhead cable, including protective layer, the inner wall of protective layer is fixedly connected with reinforcing layer, the inner wall of reinforcing layer is fixedly connected with filling layer, the inner wall of filling layer is fixedly connected with shielding layer, the surface of shielding layer is provided with fireproof assembly, the inner wall of shielding layer is fixedly connected with insulating layer, the inner wall of insulating layer is fixedly connected with conductor.The fireproof assembly includes protective sleeve, the inner wall of protective sleeve is fixedly connected with isolation frame.The utility model is by using in cable interior setting fireproof assembly and in the design of fire, interior's expanded graphite extrusion protective sleeve to make potassium chlorate powder and sulfur powder mix and carry out reaction to fire point to extinguish, realize when cable fire can automatically control the purpose of fire, prevent fire spread to other areas and cause greater economic loss, to further improve the practicality of cable.

The utility model relates to the potassium perchlorate precipitation field especially relates to a needle type potassium perchlorate precipitation filtering device. Including the precipitation box, first cooling precipitation mesh plate and second cooling precipitation mesh plate, the precipitation box main part is square box structure, the inside of precipitation box is vertically arranged with a plurality of first cooling precipitation mesh plate and second cooling precipitation mesh plate, first cooling precipitation mesh plate and second cooling precipitation mesh plate level from one side first insertion port and second insertion port insert, first cooling precipitation mesh plate and second cooling precipitation mesh plate staggered arrangement, the top middle part of precipitation box is provided with liquid inlet. Through the refrigeration of refrigerating machine to the precipitation box, makes inside keep a temperature that can fast precipitate, the structure of first cooling precipitation mesh plate and second cooling precipitation mesh plate can make solution can quickly spread, thereby make the precipitation effect better, first cooling precipitation mesh plate and second cooling precipitation mesh plate can be quickly replaced after the precipitation is complete.

The utility model discloses a quicksand type potassium perchlorate production device which comprises a centrifugal machine, a centrifugal head tank, a material mixing device, a material screening device and a soaking tank, the material mixing device comprises a charging barrel, a stirring mechanism, a sealing cover plate mechanism and a discharging port, the stirring mechanism is connected with the charging barrel, the sealing cover plate mechanism is installed on a feeding port of the charging barrel in a sealing mode, and the material screening device is installed on the discharging port of the charging barrel. The discharge port is formed in the bottom of the charging barrel; the stirring mechanism is used for mixing a plurality of materials in the charging barrel; the material screening device comprises a material screening groove, a discharging bin, a filter screen and a vibration motor, the material screening groove is formed in the bottom of the material barrel, the discharging port is communicated with the material screening groove, the discharging bin is installed at an opening in the lower portion of the material screening groove, the filter screen is installed in the material screening groove, the discharging port is higher than the filter screen, and the vibration motor is installed on the material screening groove; the potassium perchlorate production device aims at solving the problem that in the prior art, when a potassium perchlorate production device is used for producing potassium perchlorate, potassium perchlorate is caked.

This invention relates to the field of metallic materials technology, specifically to a method for producing an aluminum-tungsten-tantalum ternary master alloy. The method involves mixing tantalum pentoxide, aluminum powder, and potassium chlorate, placing the mixture in a molten pool, igniting it with a magnesium strip, and cooling it to obtain an aluminum-tantalum alloy ingot. After removing the surface alumina from the ingot, the ingot is machined into chips in a glove box for later use. Tungsten trioxide, aluminum powder, and the chipped aluminum-tantalum alloy are then mixed and placed in a vacuum aluminothermic furnace. The furnace is closed, a vacuum is created, and a mixture of magnesium and potassium permanganate is sprayed in. The mixture is ignited to initiate a vacuum aluminothermic reaction. After the reaction occurs, the vacuum level in the furnace is increased, and the furnace is cooled. The furnace is then opened, and the slag is removed to obtain the aluminum-tungsten-tantalum alloy ingot. This invention combines metallothermic reduction with vacuum aluminothermic processes to prepare the aluminum-tungsten-tantalum ternary alloy, producing an aluminum-tungsten-tantalum alloy with high homogeneity and low gaseous impurities. This solves the problems of high melting point, high density, and high gaseous impurity content in traditional aluminothermic reaction production methods.

The utility model relates to anti-caking stirring equipment in the drying process of potassium perchlorate, and belongs to the technical field of chemical equipment, the anti-caking stirring equipment can fully stir the potassium perchlorate and prevent the potassium perchlorate from caking in the drying process to a certain extent, and the comprehensive practicability is good. The mounting box is detachably mounted at the bottom of the stirring tank; the three supporting discs are fixedly welded to the bottom of the mounting box; the driving motor is detachably mounted in the mounting box, and the output end of the driving motor extends into the stirring tank through an output hole formed in the stirring tank and is fixedly welded with a stirring shaft; the stirring cover is slidably connected to the end, away from the mounting box, of the stirring tank; the plurality of stirring blades are fixedly welded on the stirring shaft, the stirring blades are uniformly arranged in three layers, the included angles between each layer of stirring blades and the horizontal plane are respectively 20 degrees, 40 degrees and 60 degrees, and a pneumatic vibrator is fixedly mounted at one end, far away from the stirring shaft, of each stirring blade.

The present invention discloses a composition for stably flowering longans matured in September and November and its application. The composition is composed of potassium chlorate and sodium tungstate. Application of the composition in improving the flowering rate and / or yield of longans planted in the late season. A method for improving the flowering rate and / or yield of longans planted in the late season, comprising applying the composition of the present invention in spring to chemically induce flowering of the late season longans. The present invention improves the method of using a single potassium chlorate to induce flowering. By adding sodium tungstate when applying potassium chlorate, the flowering rate of plants induced by potassium chlorate in the late season can be effectively increased. The method can adjust the longan production period, reduce the impact of the environment on the flowering effect, break the limitation that the main longan producing areas in my country cannot achieve the production of longans in the late season, extend the longan harvest time, reduce the dependence on imported longans, increase the product value, improve the enthusiasm of fruit farmers for planting and provide them with technical support for the planting of the late season longan.

The utility model provides a kind of potassium perchlorate material conveyor, it is related to conveyor technical field, including base and conveying pipe.The utility model drives second sprocket to rotate by starting first motor, second sprocket rotation will drive second shaft to rotate inside conveying pipe, second shaft rotation will drive helical conveying piece to rotate, helical conveying piece rotation will spiral convey the potassium perchlorate material in conveying pipe to discharge pipe, simultaneously, second sprocket is connected with first sprocket by chain, the rotation of second sprocket will drive chain transmission, and then make first sprocket rotate, first sprocket is fixedly installed on first shaft, so first shaft will rotate with the rotation of first sprocket, the broken rod installed on first shaft will also rotate, when material is conveyed to discharge pipe by helical conveying piece, rotating broken rod can disperse material, avoid because of extrusion, friction and other factors in conveying process cause material to gather and form larger particle.

This invention discloses a method for preparing a self-synthesized graphene-coated manganese-iron precursor, a lithium manganese iron phosphate cathode material, its preparation method, and its application, relating to the field of battery materials technology. The method for preparing the self-synthesized graphene-coated manganese-iron precursor includes: mixing a manganese source, an iron source, a nickel source, graphite powder, perchloric acid, and potassium chlorate; stirring and reacting the mixture at 200–400°C for 7–12 hours under inert gas protection; and washing and drying to obtain the self-synthesized graphene-coated manganese-iron precursor. This invention improves the uniformity of manganese-iron element distribution and carbon coating at the microscopic level by first reacting iron, manganese, and graphite to generate a graphene-coated manganese-iron precursor, and then mixing the resulting precursor with a phosphorus source, a lithium source, and a carbon source through sand milling. The metal-catalyzed synthesis of graphene and the double carbon coating process result in more uniform carbon coating, improving the purity and conductivity of the material, while simultaneously reducing the specific surface area and increasing the capacity.

The utility model discloses potassium perchlorate smashing and screening integrated equipment, and relates to the technical field of potassium perchlorate production equipment, the potassium perchlorate smashing and screening integrated equipment comprises a smashing mechanism and a screening mechanism, the bottom of the smashing mechanism and the top of the screening mechanism are fixedly installed, in the potassium perchlorate smashing and screening integrated equipment, a negative pressure pump conducts negative pressure operation on the interior of a machine body through a negative pressure pipe; the inside of the machine body is in a certain negative pressure environment, external air is difficult to enter the machine body, meanwhile, in the crushing process, a ventilator pumps dust-containing air in the machine body to dust removal equipment through a pipeline, and through the mode that a negative pressure pump and the ventilator are combined, the diffusion range of dust can be controlled, and the safety of the equipment is improved; in the crushing process, the pump body conveys low-temperature cooling liquid in the circulating cooling box into the spiral cooling pipe, the cooling liquid spirally flows upwards through the spiral cooling pipe, heat generated in the crushing process is taken away in time, the situation that the temperature is too high due to heat accumulation is avoided, and the possibility of accidents such as explosion caused by high temperature is reduced.

This fire extinguishing material includes a fire extinguishing agent layer containing a fire extinguishing agent. This fire extinguishing agent contains: a radical generating agent containing an organic potassium salt; and an oxidizing agent containing a potassium salt. The abundance ratio of potassium on the surface of the fire extinguishing material is 36% or more. The potassium salt may be potassium chlorate. The fire extinguishing agent layer may further contain a binder resin. The fire extinguishing material may further include a base material.

The invention provides a preparation method of high-purity metal vanadium, which comprises the steps of raw material selection, aluminothermic reduction, electron beam melting equipment configuration, preheating and vacuumizing, electron beam melting, repeated melting and cast ingot forming, specifically, high-purity V2O3, high-purity aluminum powder and potassium chlorate are mixed and subjected to a vacuum aluminothermic reduction reaction under the protection of argon, and the high-purity metal vanadium is obtained; the vanadium-aluminum alloy with the vanadium content of 75% is generated; electron beam melting: focusing a high-energy electron beam on the vanadium-aluminum alloy through an electron gun, melting the high-energy electron beam and dripping the high-energy electron beam into a molten pool; multiple smelting: smelting twice or multiple times, and respectively removing high-vapor-pressure impurities and low-vapor-pressure impurities; cast ingot forming, wherein molten metal obtained after smelting is cooled and crystallized to form a cast ingot; according to the method, the vanadium-aluminum alloy is prepared by optimizing electron beam melting process parameters and combining an aluminothermic reduction method, and efficient and low-cost production of high-purity vanadium metal is achieved.

A method for preparation of a fire-extinguishing sheet including a fire-extinguishing agent and binding agent, wherein the fire-extinguishing agent is capable of generating a fire-extinguishing component by thermal decomposition upon reaching a prescribed temperature, the fire-extinguishing agent comprises tripotassium citrate and potassium chlorate, and the binding agent comprises polyvinyl butyral. the method includes the steps of dissolving the binding agent into a solvent to obtain a solution of the binding agent, mixing tripotassium citrate and potassium chlorate in a solvent and milling the mixture to obtain a fire-extinguishing agent slurry, mixing the solution of the binding agent and the fire-extinguishing agent slurry and milling the mixture to obtain a coating material, coating the coating material on a sheet and drying the coating material on the sheet and optionally cutting the sheet.

The invention relates to a process for the synthesis of the compound 5,7-diiodo-1-oxaspiro[2,5]octa-4,7-dien-6-one. This process for the synthesis of the compound 5,7-diiodo-1-oxaspiro[2,5]octa-4,7-dien-6-one comprises an oxidation reaction of 4-Hydroxy-3,5-diiodobenzyl alcohol with a hypochlorite oxidant, in particular selected from sodium, calcium and potassium hypochlorite. This process allows a significant improvement in yield in a simple and inexpensive manner.

The invention relates to a novel deodorant for removing formaldehyde, hydrogen sulfide and ammonia and application thereof in deodorant spray. The novel deodorant contains a plant source deodorant, a disinfectant, a biological desulfurizer, sesame oil, a buffer solution and a propellant, wherein the biological source deodorant is selected from one or more of tea polyphenol, a folium eucalypti extract, a bamboo leaf extract, peroxidase, tannic acid or plant straw fermentation liquor; the disinfectant is selected from one or more of potassium hypochlorite, calcium hypochlorite, glutaraldehyde, benzalkonium bromide or hydrogen peroxide; the biological desulfurizing agent is selected from one or more of hydrogen sulfide oxidase, thiocyanate enzyme, Mn / Ce-HMS, CuO-CaCO / BC, Zn-Mn / KIT-1 and sulfur oxidizing bacteria / ceramic carriers. Through the synergistic effect of a chemical method and a biological enzyme method, various harmful ingredients such as formaldehyde, ammonia and hydrogen sulfide are efficiently removed and decomposed at a time, environmental pollution is reduced, meanwhile, the disinfection and sterilization effects are achieved, operation is easy, and the deodorant spray has wide application prospects in deodorant spray.

The invention discloses a method for measuring the arsenic content in copper, lead and zinc raw ores, and particularly relates to a method for measuring the arsenic content in the copper, lead and zinc raw ores by a silver diethyldithiocarbamate spectrophotometric method, which comprises the following steps: decomposing a sample by using a nitric acid-potassium chlorate solution, ammonium bifluoride and sulfuric acid; arsenic is reduced by zinc in a sulfuric acid medium to generate arsenic hydride gas, and the arsenic hydride gas is absorbed by adopting a silver diethyldithiocarbamate trichloromethane solution. Silver in the silver diethyl dithiocarbamate is reduced by arsenic hydride, the separated silver is in a simple substance colloidal state and is red, the absorbance is measured by a spectrophotometer, and the arsenic content is calculated according to a standard curve method. The method has the characteristics of high accuracy, good precision, simplicity in operation, high practicability and the like.