90results about How to "Reduce the amount added" patented technology

The invention discloses a room-temperature-cured high-strength high-thermal-conductivity and high-electric-conductivity silver adhesive which is characterized by comprising the following components in parts by weight: 100 parts of hydroxyl-terminated polydimethylsiloxane, 2-6 parts of carbon nanotubes, 200-450 parts of conductive particles, 1-5 parts of a silane coupling agent, 5-12 parts of a cross-linking agent and 0.5-5 parts of a catalyst. The invention further discloses a preparation method of the room-temperature-curing high-strength high-thermal-conductivity and high-electric-conductivity silver adhesive. The room-temperature-cured high-strength high-thermal-conductivity and high-electrical-conductivity silver adhesive has the advantages of short curing time, low volume resistivity, high bonding strength and good electrical conductivity. The product is tested after being placed in an outdoor environment for 12 months for a long time, the volume resistivity and the bonding strength of the conductive silver adhesive disclosed by the invention are hardly influenced, and the conductive silver adhesive shows excellent weather resistance; the product has high stability and can be used for a long time.

The invention relates to the technical field of high polymer materials, and particularly discloses a nuclear-grade cable for spent fuel aftertreatment and a preparation method of the nuclear-grade cable. Comprising the following steps: S1, taking hydroxyl-containing cyclotriphosphazene, tetra (4-hydroxybenzene) ethylene, oleic acid acyl chloride, guar gum hydroxypropyl trimethyl ammonium chloride, triethylamine and a mixed solvent, cooling, dropwise adding triethylamine in a nitrogen atmosphere, dropwise adding a phenoxyphosphoryl dichloride solution, stirring for reaction, filtering, and performing rotary evaporation to obtain a composite flame retardant; s2, polyethylene, aluminum hydroxide, a composite flame retardant and an anti-radiation agent are added into an internal mixer for mixing, a cross-linking agent is added, uniform mixing, extrusion and granulation are performed, and a cable material is obtained; the cable material is used for preparing an outer sheath layer of a nuclear-grade cable. S3, twisting a plurality of copper metal monofilaments to form a conductor, wrapping the conductor with an insulating layer, and wrapping the conductor with a polyimide film to form a wire core; a plurality of wire cores are twisted to form a cable core; a non-woven fabric wrapping tape layer and an outer sheath layer are wrapped outside the cable core; and obtaining the nuclear-grade cable.

The invention discloses a preparation method of tert-amyl peroxypivalate and an initiator, and belongs to the technical field of preparation of initiators. The preparation method comprises the following steps: by taking water as a solvent, when tert-amyl hydrogen peroxide and caustic soda liquid react to generate tert-amyl peroxide salt, the tert-amyl peroxide salt and pivaloyl chloride are subjected to substitution reaction to obtain the tert-amyl peroxide, and the substitution reaction speed of the pivaloyl chloride is higher than the hydrolysis speed of the pivaloyl chloride. Auxiliary materials are dispersed in an oil phase, shearing and emulsifying are carried out, the peroxide pivalate initiator is obtained, the auxiliary materials comprise an emulsifying agent, a dispersing agent, an anti-freezing agent and water, and the oil phase adopts the peroxide pivalate obtained through the method. The oil-phase raw material residue is low, and the storage stability time of the initiator emulsion prepared from the oil phase is longer than 30 months.

The invention discloses a preparation method of a flame-retardant viscose fiber with an antibacterial function, which comprises the following steps: (1) under sufficient stirring, sequentially adding a phosphorus flame retardant, a dispersant and graphene oxide into deionized water with an alkaline pH value, and stirring and ball-milling to obtain a flame retardant dispersion liquid; (2) preparing a spinning stock solution by taking cellulose pulp as a raw material, and adding the flame retardant dispersion liquid into the spinning stock solution by adopting a pre-spinning injection method to prepare a blended spinning stock solution; (3) spinning the blended spinning stock solution in a coagulating bath, and reducing the blended spinning stock solution in an oxidation-reduction bath to obtain a formed tow; and after drafting, carrying out a post-treatment process to obtain the flame-retardant viscose fiber with the antibacterial function. The production process is optimized from multiple aspects such as selection of raw materials for preparing the flame retardant, oxidation reduction and the like, and the prepared flame-retardant viscose fiber has excellent flame retardance, good physical and mechanical properties and antibacterial properties and good wearability.

The invention belongs to the technical field of resin polymerization additives, and particularly relates to an antioxidant type suspended emulsion terminator for PVC (polyvinyl chloride) and a preparation method thereof, the antioxidant type suspended emulsion terminator comprises the following raw material components in parts by mass: 5-30 parts of phenolic antioxidant; 5 to 20 parts of a thioester antioxidant; 0.1-5 parts of an ultraviolet light absorber; 0.1 to 5 parts of a chain terminator; 1-10 parts of a heat stabilizer; 0.1 to 7 parts of a stabilizer; 0.1 to 5 parts of an emulsifier; 0.1-5 parts of a wetting dispersant; according to the invention, through the combination of the selected main and auxiliary antioxidants and the combination of the ultraviolet light absorber and the heat stabilizer, the defect structure of PVC is improved at the end of PVC polymerization, and meanwhile, the combination of the main and auxiliary antioxidants can quickly decompose peroxide and hydroperoxide at the later stage of processing; compared with the prior art, the whiteness and thermal stability of PVC in the early stage are good, the anti-yellowing effect and the long-term aging resistance of PVC in the later processing are more emphasized, the performance of PVC in the dynamic thermal stability is improved, and the volume impedance and the initial coloring are low.

The invention provides a method for preparing ferrous sulfate from iron-containing solid waste, and relates to the field of solid waste treatment. The method for preparing ferrous sulfate from the iron-containing solid waste comprises the following steps: mixing concentrated sulfuric acid and the iron-containing solid waste, and curing in a reducing atmosphere or a protective atmosphere to obtain a cured material; the cured material is subjected to water leaching and centrifugal separation, and silicon-containing slag and leachate are obtained; carrying out deepening treatment on the silicon-containing slag to obtain white carbon black; the leachate and iron powder are mixed for a reduction reaction, then a vulcanizing agent is added for vulcanization, precipitation and impurity removal, and copper sulfide slag and a ferrous sulfate solution are obtained through solid-liquid separation; treating the copper sulfide slag to recover valuable metals; and crystallizing the ferrous sulfate solution to obtain ferrous sulfate crystals. According to the method for preparing the ferrous sulfate from the iron-containing solid waste, low-cost, short-process and high-efficiency treatment of the iron-containing solid waste is achieved, and the ferrous sulfate product is obtained.

The invention relates to an automatic acid adding control method for circulating cooling water. The method comprises the following steps that S1, an online monitoring meter is installed in a circulating cooling water system; s2, monitoring data of the online monitoring meter, judging whether abnormity exists or not, if not, executing the step S3, and if not, executing the step S4; s3, processing the data of the online monitoring meter, and controlling the acid pump according to the processed data; and S4, performing decision logic judgment processing on the abnormal data. Compared with the prior art, the automatic acid adding device has the advantages that automatic acid adding and accurate control of the circulating water system are achieved, manual operation of operators is comprehensively replaced, and equipment damage and pipeline corrosion caused by out-of-control acid adding can be effectively prevented.

The present application relates to the field of magnet technology, and specifically discloses a high coercive force NdFeB magnetic material and a preparation method thereof. The high coercive force NdFeB magnetic material of the present application includes a magnetic material body, a heavy rare earth layer and a light rare earth layer. The magnetic material body is mainly made of the following raw materials: neodymium, gadolinium, copper, boron, cerium, aluminum, niobium iron, and iron; the preparation method includes: the preparation of the magnetic material body includes the following steps: melt stripping, hydrogen crushing and grinding, pressing and molding, and sintering to obtain a magnetic material body one; the preparation of the heavy rare earth layer includes the following steps: slicing, mixing, heating and melting, evaporation, and forming a thin film on one side of the slice; infiltration, quenching and tempering treatment to obtain a magnetic material body two; the preparation of the light rare earth layer includes the following steps: preparing a light rare earth alloy sheet, the light rare earth alloy sheet is attached to the side of the magnetic material body two opposite to the heavy rare earth layer, and thermal diffusion and tempering are performed to obtain the magnetic material body two. The NdFeB magnetic material of the present application has high coercive force and low cost.

The invention provides a modified diaphragm for a polyanion solid sodium battery and a preparation method of the modified diaphragm. The modified diaphragm comprises: a base membrane; the solid electrolyte layer is arranged on at least one side surface of the base membrane, and the solid electrolyte layer comprises an oxide solid electrolyte and a polymer solid electrolyte; and the gel electrolyte layer is arranged on the outer surface of the oxide solid electrolyte layer. According to the invention, the diaphragm can better adapt to a high-pressure system, the transmission rate and the diffusion coefficient of sodium ions are improved, so that the cycle life of a polyanion solid sodium battery is prolonged, the rate capability and the low-temperature performance of the battery are improved, the thermal stability of the diaphragm is improved, and the service life of the battery is prolonged. The adverse effects of positive and negative electrode contact, chemical reaction and the like caused by thermal shrinkage of the diaphragm are avoided; in addition, the puncture resistance of the diaphragm is improved while the air permeability is not influenced and the dynamics is ensured, the addition amount of the liquid electrolyte is obviously reduced, and the safety performance of the battery is effectively improved.

The invention discloses a method for preparing fatty acid by anaerobic fermentation of organic solid waste, which comprises the following steps: S1, inoculating activated sludge into an anaerobic reactor, and adding the organic solid waste for anaerobic fermentation; s2, part of fermentation products are discharged from the anaerobic reactor in the anaerobic fermentation process, the discharged fermentation products are subjected to solid-liquid separation to obtain biogas residues, the organic solid waste and the biogas residues are added into the anaerobic reactor, and the volume ratio of the biogas residues to the organic solid waste is 1: (6-10); s3, the step S2 is repeated, anaerobic fermentation is continuously carried out, and organic solid waste treatment is completed. According to the method, the organic carbon source in the organic solid waste can be continuously and efficiently converted into the fatty acid, the method has the advantages of being simple in process, low in cost, high in preparation efficiency, high in substrate utilization rate, high in fatty acid yield, high in medium-chain fatty acid proportion and the like, and a new way is provided for efficient resource utilization of the organic solid waste.

The invention discloses a lutein-loaded functional hollow salt and a preparation method thereof, the functional hollow salt is prepared by taking a Maillard reaction product of whey protein isolate and maltodextrin as a salt carrier, mixing the salt carrier with lutein-loaded vegetable oil and carrying out spray drying, the weight percentage of sodium chloride in the functional hollow salt is greater than 50% and less than or equal to 85%. The particle size of the hollow salt is 1 / 10 of that of common salt. The reduction of the particle size generally shows that a denser particle structure is formed in the spray drying process, so that the exposure of active ingredients can be reduced, the possibility of oxidation or photolysis is further reduced, and the stability of the ingredients is improved; through comparison of sensory evaluation, it is found that when the same salty taste feeling is achieved, 20-30% of salt can be reduced in the hollow salt; the lutein-loaded hollow salt prepared by the invention is relatively dispersed, has no adhesion phenomenon, and can be stored for a long time under a certain condition.

The invention discloses a ladle slag line repairing material which comprises the following components in percentage by mass: 60-85% of magnesia, 5-15% of used magnesia carbon brick powder, 2-11% of iron phosphorus powder, 0.3-2% of metal aluminum powder, 2-6% of superfine graphite powder, 2-8% of pig iron particles, 1-10% of kaolin fine powder and 1-5% of spherical SiO2 micro powder. And 2-20% of additional waste engine oil, 0-16% of aluminum dihydrogen phosphate and 0.2-0.6% of amine-terminated polyisobutene are further included. The steel ladle slag line repairing material has good high temperature resistance and adhesion performance, the adhesion effect on a steel ladle slag line can be effectively improved, the service life of the steel ladle slag line can be prolonged, and the steel ladle slag line repairing material is wide in applicability; and the related preparation method is relatively simple and relatively short in period, can realize resource utilization of various solid and liquid wastes, and has remarkable economic and environmental benefits.

The invention relates to a flame-retardant sponge based on a biomass flame retardant and a preparation method of the flame-retardant sponge. The flame-retardant sponge is prepared from the following components in parts by weight: 90 to 110 parts of polyether polyol, 50 to 90 parts of MDI (methylene diphenyl diisocyanate) or TDI (toluene diisocynate), 0 to 0.5 part of chain extender, 0.05 to 4 parts of efficient foam stabilizer, 0.05 to 0.5 part of efficient composite catalyst, 0 to 6 parts of external foaming agent, 1 to 5 parts of water and 0.1 to 2 parts of biomass flame retardant, the preparation method of the biomass flame retardant comprises the following steps: reacting sodium phytate with hydroxypropyl-beta-cyclodextrin, carrying out suction filtration, washing, and carrying out vacuum drying to obtain the biomass flame retardant of the phytic acid cyclodextrin ester. The preparation method has the advantages that the biomass material-grade halogen-free flame retardant is added in synthesis of a polyurethane flexible foam material, and phytic acid cyclodextrin ester with flame retardance is anchored to PU, so that a durable flame-retardant effect is achieved; the flame retardant is free of pollution and harm, the addition amount of the biomass flame retardant is small, the performance of the PU is not affected, and the effect of being free of smoke poisoning can be achieved.

This invention discloses a method for controlling sulfides in sulfur-containing gear steel, belonging to the field of metallurgical technology, including converter, LF refining, RH refining, and continuous casting processes. Converter process: molten steel tapping temperature 1630±20℃, carbon-oxygen product controlled below 0.0020; LF refining process: aluminum content in molten steel controlled at 0.035-0.045%, LF slag composition adjusted to R: 1.5-2.5, FeO+MnO: 1.0-2.0%; RH refining process: ferrotitanium added in one step to adjust the composition appropriately; Continuous casting process: argon-blown stopper rods and submerged entry nozzles are used for continuous casting, and 150-200 kg of low-basicity tundish covering agent is added to the tundish. The sulfur-containing gear steel produced by this invention can be continuously drawn for more than 10 heats, and the level of Class A inclusions can be stably controlled at A coarse ≤ 1.0 grade and A fine ≤ 1.5 grade, with a pass rate of over 99.9%.

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a refining process molten steel end-point oxygen content prediction and deoxidation process, which comprises the following steps: collecting historical data, training and testing a refining end-point oxygen content prediction model based on a machine learning technology to obtain a constructed end-point oxygen content prediction model; according to the established prediction model, calculating the influence degree of different operation parameters on the end-point oxygen content, and determining the influence effect of each factor on the end-point oxygen content; and applying a particle swarm algorithm to the oxygen content prediction model, and calculating an optimal deoxidation process. According to the method, the particle swarm optimization is combined with the deep neural network technology to be applied to the deoxidation operation in the molten steel refining process, the final oxygen content after molten steel refining is completed is precisely controlled, the deoxidation effect is improved, the production cost is reduced, and the product quality is improved.

The toughened heat-resistant high-transparency modified polyester is characterized by comprising the following components: terephthalic acid, ethylene glycol, hydroxyethoxy arene derivative dihydric alcohol, a flexible copolymerization modified monomer, a catalyst and a stabilizer. The invention also discloses a preparation method of the toughened heat-resistant high-transparency modified polyester. A hydroxyethoxy arene derivative diol monomer is used as a third comonomer for heat-resistant modification, and a flexible comonomer is used as a fourth comonomer for toughening modification, so that the prepared copolyester with high glass transition temperature has excellent heat resistance and toughness.

The application relates to the technical field of rubber materials, and discloses fluorine rubber for high-temperature oxygen sensors and a processing technology thereof. The processing technology comprises the following steps: S1: fluorinated modified methyl vinyl silicone rubber is prepared from methyl vinyl silicone rubber and 1H, 1H, 2H, 2H-perfluorodecanethiol; S2: glycerol modified silicone rubber is prepared from methyl vinyl silicone rubber and 1-thioglycerol; the glycerol modified silicone rubber is taken, mixed uniformly in a mixed solvent of tetrahydrofuran and water, urea is added, phosphoric acid is added dropwise under heating, and the mixture is kept for reaction, the solvent is removed, and the mixture is dried to obtain phosphoric acid ester modified methyl vinyl silicone rubber; S3: the fluorine rubber after being broken, the fluorinated modified methyl vinyl silicone rubber and the phosphoric acid ester modified methyl vinyl silicone rubber are added into an open mill and mixed uniformly, a composite filler and magnesium oxide are added, mixing is carried out, a vulcanizing agent and a crosslinking aid are added, mixing is carried out uniformly, and vulcanization is carried out to obtain the fluorine rubber for high-temperature oxygen sensors.

The invention provides an intelligent control method for heat balance in the aluminum alloying process. The intelligent control method comprises the steps that S1, the target aluminum content of molten steel in an RH refining device, the total mass of the molten steel and the specific heat capacity of the molten steel are obtained; s2, according to the actual production state and the production steel type, the oxygen value of the molten steel before alloying and the refining entering temperature are collected according to the time sequence, and the aluminum yield is calculated; s3, based on the aluminum yield, heat balance operation judgment conditions are set, and if yes, calculation is conducted according to an empirical formula; if yes, executing the step S4; s4, calculating the heat effect of the aluminum dissolving process, the heat effect of the aluminum melting process and the heat effect of the aluminum-oxygen reaction; s5, calculating the total heat effect; s6, the temperature change value of the molten steel system in the alloying process is calculated; and S7, according to the difference value between the temperature change value of the molten steel system in the alloying process and the target refining final temperature, a compensation heating or cooling instruction is output, the actual final temperature is made to be consistent with the target value, the instruction is automatically executed to complete aluminum alloy affiliation, and the temperature-controlled molten steel with the aluminum content reaching the standard is obtained.

The invention relates to the technical field of lithium ion batteries, and particularly discloses a high-stability lithium battery pole piece as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, adding a first binder into deionized water, uniformly dispersing, adding an oxidized conductive filler, stirring and mixing to obtain a first bonding layer solution, adding an active material, stirring and mixing, and carrying out spray drying at 150-160 DEG C to obtain a modified active material; s2, mixing the modified active material, a second binder and a conductive filler for 5-10 hours by a dry method; carrying out fibration treatment for 5-10 hours at the temperature of 150-200 DEG C to obtain a composite active material; s3, rolling the composite active material on the surface of the current collector to form an active layer of 50-300 [mu] m; the high-stability lithium battery pole piece is obtained. The first binder comprises one or more of polyacrylic acid, sodium carboxymethyl cellulose and polyethylene glycol; and the second binder is polytetrafluoroethylene.

The invention belongs to the technical field of battery material recovery, and specifically relates to a method for recovering lithium from lithium iron phosphate black powder. The method comprises the following steps: mixing the lithium iron phosphate black powder with auxiliary materials, burning, and acid dissolving to obtain a lithium liquid; the auxiliary materials include an inorganic compound M that does not undergo redox reaction with lithium iron phosphate at normal temperature and pressure. a N b or a mixture thereof, M includes calcium, magnesium, aluminum, silicon, trivalent iron, titanium, zinc, N includes oxygen, hydroxide, carbonate, sulfate, silicate, aluminate, and a and b are positive integers > 0. The method can effectively improve the yield of lithium, and the addition of specific auxiliary materials can control the burning temperature, reduce the carbon emission in the tail gas, increase the ferrous oxidation rate during the burning process, thereby reducing the use of subsequent oxidants, and even achieve no use of oxidants.

The invention belongs to the technical field of veterinary vaccines, and discloses a vaccine diluter for animal husbandry and veterinary and a method thereof.The vaccine diluter comprises a supporting bracket, the lower side of the supporting bracket is fixedly connected with fixed connecting rings distributed in a circumferential array mode, the fixed connecting rings are slidably connected with ball head sliding rods, and the ball head sliding rods are hinged to a motor mounting frame; a telescopic motor is mounted in the motor mounting frame, a telescopic piston rod is mounted on the upper side of the telescopic motor, an isolation dissolving net is fixedly connected to the telescopic piston rod, and the telescopic piston rod is slidably connected with a dissolving barrel in a penetrating manner; through cooperation of structures such as an isolation dissolving net and an elastic film, a telescopic motor drives a telescopic piston rod and the isolation dissolving net to slide upwards, so that a freeze-dried vaccine in the isolation dissolving net is in contact with the elastic film, and a diluent in a diluent barrel is extruded and dissolved to flow into the dissolving barrel; meanwhile, the freeze-dried vaccine is prevented from being damaged due to excessive stress through the elastic material of the dissolving diluent barrel.

This invention discloses a method for controlling the nitrogen content of molten steel in a converter with low iron consumption mode, belonging to the field of steel manufacturing technology. The method includes the following steps: controlling the molten iron inlet temperature to 1310-1330℃, controlling the silicon content in the molten iron to 0.30%-0.50%, controlling the molten iron charging ratio to 65-70%, and the scrap steel charging ratio to 30-35%; controlling the converter iron-to-steel ratio to 720-750 kg / t; after adding scrap steel into the furnace, shaking the furnace back and forth until the furnace mouth flame is normal, and baking the scrap steel; adding 50% of the slag in the first 4 minutes of the converter blowing process, and then adding the remaining slag in small amounts multiple times over 4-8 minutes, controlling the furnace temperature, and stirring the molten pool back and forth from high to low with an oxygen lance before the end point; using nitrogen-argon switching bottom blowing during the converter blowing process; adding ladle slag modifier before tapping, and then adding deoxidizer for alloying, while simultaneously performing ladle bottom blowing with argon. The control method of the present invention can control the nitrogen content of converter steel to within 40 ppm under the condition that the iron-to-steel ratio in the converter is as low as 720-750 kg / t.

The present application proposes a lightweight reinforced flame-retardant polypropylene composite material and a preparation method thereof, and relates to the technical field of flame-retardant polymer materials. A lightweight reinforced flame-retardant polypropylene composite material is prepared by the following method: 3‑5 parts of polypropylene are dissolved in an appropriate amount of decalin to prepare a polyethylene solution; 3‑4 parts of flame retardant monomers and 0.5‑1.5 parts of multilayer graphene are added to the polypropylene solution; a chemically inert gas is passed into the solution and ultrasonic irradiation is applied to the above solution for 15‑20 minutes. Then the solvent is removed and recovered, and dried. The dried product is mixed with 95‑97 parts of polypropylene and extruded and granulated to obtain a lightweight reinforced flame-retardant polypropylene composite material. The lightweight reinforced flame-retardant polypropylene composite material provided in the present application has a tensile strength of ≥35.4MPa and an impact strength of ≥4.8kJ·m ‑2 , density 0.90g.cm ‑3 , the flame retardant performance reaches V0 level, and it has good mechanical properties and flame retardant properties.

The invention relates to the technical field of papermaking production, in particular to a production method of an anionic garbage capturing agent, when a high-positive-charge low-molecular-weight polymer is prepared, high-density positive charges of the anionic garbage capturing agent can effectively adsorb anionic garbage, fine fibers and fine components in a system; the consumption of aluminum sulfate can be effectively reduced, after the consumption of the aluminum sulfate is reduced, the concentration of sulfuric acid anions is reduced by about 30%, and interference on a wastewater treatment system can be reduced; in the using process, PCD control over white water is stable, the turbidity of the white water has a decreasing trend, it is indicated that colloid retention of the system becomes good, the system is cleaner, and therefore certain benefits can be brought to improvement of the operation performance of a paper machine; as an organic anion garbage trapping agent which is low in molecular weight, high in charge density and free of sulfate radicals, the anion garbage trapping agent is small in adding amount, cannot be accumulated in a system, can be taken away along with a paper web in the papermaking process, and cannot cause any influence on a water system.

The invention discloses a preparation method of white carbon black for a rubber base plate of a high-speed railway fastener system, and belongs to the field of preparation methods of white carbon black, the white carbon black comprises the following raw materials: sodium silicate, sulfuric acid, a nonionic active agent and a silane coupling agent, and the white carbon black is prepared by improving a manufacturing process and setting a specific temperature and a preparation mode. The nonionic active agent and the silane coupling agent can better form specific cooperation, steric hindrance among white carbon black particles is increased, chemical bonding of the white carbon black and the silane coupling agent is enhanced, the reaction efficiency is accelerated, and the reaction environment and stability are optimized, so that agglomeration of the white carbon black particles is prevented, the dispersion effect of the white carbon black in rubber is improved, and the service life of the rubber is prolonged. By setting a two-stage mixing flow rate, uniform primary particles are rapidly formed, gel is reduced, the good state of a reaction system is kept, the particles uniformly grow into balls, the action between the particles and a rubber matrix is enhanced, and the rubber cushion plate is more economical and environment-friendly.

The invention discloses a low-temperature container steel plate for a low-temperature LNG (Liquefied Natural Gas) storage tank and a production method of the low-temperature container steel plate, the thickness of the steel plate is 8mm-50mm, and the steel plate comprises the following chemical components in percentage by mass: 0.02%-0.06% of C, 0.05%-0.15% of Si, 4.50%-5.5% of Mn, less than or equal to 0.005% of P, less than or equal to 0.002% of S, 0.02%-0.03% of Nb, 1.0%-1.5% of Ni, 0.015%-0.035% of Als, 0.002%-0.03% of Ce, 0.08%-0.14% of Mo and the balance of Fe and residual elements. The structure of the obtained steel plate is tempered martensite and reversed austenite through converter alloy smelting, secondary decarburization and dephosphorization in a steel ladle, refining and P and S removal, pouring, rolling and composite structure regulation and control heat treatment, the yield strength of the steel plate is 470-550 MPa, the tensile strength is 600-680 MPa, the elongation is 20-25%, the impact absorption energy at the temperature of 120 DEG C below zero is 198-282J, and the production cost is reduced.

The invention relates to a calcium phosphate pellet and a preparation method thereof.The calcium phosphate pellet is prepared through the following steps that calcium phosphate is ground and screened, the calcium phosphate is screened through 40-mesh, 60-mesh and 100-mesh screens respectively, and calcium phosphate powder mixtures with different granularities are obtained and marked as first materials; adding the first material and the auxiliary powder into a mixer, and uniformly mixing to obtain a second material; adding a binder into the second material, and uniformly mixing to obtain a mixture I; adding a carbon source into the mixture I, uniformly mixing, uniformly adding industrial water through a spraying device, and uniformly mixing to obtain a mixture II; pelletizing the second mixture through a material pressing machine, and then sequentially performing curing treatment, roasting treatment and cooling treatment to obtain the calcium phosphate pellets. The prepared calcium phosphate pellets are high in compressive strength and high in green pellet forming rate, the bulk density of calcium phosphate products is greatly reduced, transportation and storage are convenient, the roasting temperature in the preparation method is low, and energy consumption is greatly reduced.

The invention relates to a low-melting high-impact polypropylene special material and a production process thereof. The problems of poor normal and low temperature impact resistance, low flexural modulus and fast catalyst activity attenuation of polymers in the prior art are mainly solved. The process comprises the following steps: step A, prepolymerization reaction: prepolymerizing a catalyst and propylene to generate a prepolymerization product under prepolymerization reaction conditions; step B, homopolymerization reaction: under the action of a catalyst, the prepolymerization product is subjected to homopolymerization reaction in a multi-zone circulation reactor, and polymer basic powder is obtained under polymerization process conditions; step C, gas phase copolymerization reaction: the polymer basic powder enters a gas phase reactor, and further reacts with propylene and ethylene by utilizing the residual activity of a catalyst to generate impact-resistant copolymer powder; and D, blending, extruding and granulating to obtain a target product. The low-melting high-impact polypropylene special material prepared by the process has excellent normal and low temperature impact resistance, high strength and good processability.

The invention relates to the technical field of coal blending combustion of ammonia gas, in particular to a system and a method for blending combustion of ammonia gas in an opposed firing boiler. The system comprises a boiler body, a coal supply system, an ammonia gas preheating system and an ammonia gas pre-decomposition system, wherein the coal supply system comprises an ammonia gas pre-decomposition device, a premixing device and a secondary fan; an air preheating unit inlet of a tail flue of the boiler body is connected with a secondary fan; an outlet of the air preheating unit is connected with the premixing device; an outlet of the ammonia preheating system is connected with the ammonia pre-decomposition device, and a first outlet of the ammonia pre-decomposition device is connected with the premixing device; the premixing device is connected with a secondary air nozzle of the combustion unit; the coal supply system is connected with a second inlet of the ammonia gas pre-decomposition device, and the ammonia gas pre-decomposition device is connected with the primary air nozzle of the combustion unit. According to the method, the problems that the cost is increased or the system complexity is improved in the existing ammonia-coal mixed combustion technology, and the cost is high and the combustion stability is difficult to guarantee in the coal-fired boiler transformation process are solved.

The invention discloses a low-cost H340-grade high-strength steel rail smelting method based on rare earth treatment and cooperative control under continuous casting soft reduction, which comprises the following steps: 1) optimization of mass percent component design: on the basis of a low-vanadium high-manganese component system, introducing rare earth elements to form a Mn / V / RE multi-element cooperative strengthening mechanism; (2) controlling a continuous casting process; 3) adding and treating rare earth; and (4) other key procedures are accurately regulated and controlled. The invention aims to provide the low-cost H340-grade high-strength steel rail smelting method based on rare earth treatment and cooperative control under continuous casting soft reduction, and unification of high strength, high toughness and low cost of the steel rail is realized by optimizing a component system (introducing rare earth) and cooperatively and accurately regulating and controlling a continuous casting process.