330 results about "Powder injection" patented technology

The invention discloses a direct-current hollow electrode hydrogen plasma furnace mineral powder smelting system and method and application, and belongs to the technical field of hydrogen metallurgy. The system comprises a hollow electrode gas powder injection hydrogen plasma gun system, a direct current bottom electrode ore-smelting electric furnace system, a fine ore and hydrogen supply system and the like. The hollow electrode and the furnace bottom electrode form a direct-current arc, hydrogen carrying mineral powder is sprayed into an arc area to generate high-temperature hydrogen plasma, mineral powder reduction is achieved, and metal and slag are separated. According to the method, hydrogen serves as a reducing agent, carbon emission is reduced, the reaction efficiency is high, energy consumption is low, and the method can be used for steelmaking, smelting of micro-carbon ferromanganese and titanium slag and recovery of valuable metal in nonferrous smelting waste slag and has good green metallurgy application prospects.

The utility model relates to the technical field of powder injection, and discloses a device for solving air trapping caused by non-injection of metal powder, which comprises a lower die, an upper die is clamped at the top of the lower die, a connecting seat is fixedly connected with the top of the upper die, and first injection pipes are communicated with two ends of the connecting seat. A first injection pipe is fixedly installed in the upper mold, a second injection pipe is fixedly installed in the upper mold, the first injection pipe communicates with the second injection pipe, a fixing base is arranged in the second injection pipe, a stirring helical ribbon is fixedly connected to the top of the fixing base, and a pressing plate is fixedly connected to the top of the stirring helical ribbon; and the top of the pressing plate is rotationally connected with the top of the inner wall of the second injection pipe, and a driving mechanism is embedded into the connecting base. According to the device for solving the problem of air trapping during non-injection of the metal powder, the injected flowing metal powder is stirred to be more uniformly distributed in the second injection pipe and the mold, gaps and bubbles among powder particles are reduced, and the air trapping phenomenon is prevented.

The utility model relates to a metal powder injection machine which comprises a supporting frame, an injection mechanism and a feeding hopper, the injection mechanism is arranged on the supporting frame, the feeding hopper is communicated with the injection mechanism, the metal powder injection machine further comprises a stirring rod and a driving rod, a feeding port is formed in the top of the feeding hopper, and the stirring rod is connected with the feeding port. The stirring rod is arranged on the top face of the feeding hopper and rotationally connected with the feeding hopper, a plurality of stirring blades are evenly distributed on the outer wall of the position, located in the feeding hopper, of the stirring rod, and the driving rod and the stirring rod are arranged in a linkage mode. The utility model provides the metal powder injection machine which can stir and loosen metal particles in the feed hopper when the metal particles are blocked.

The invention discloses a compound liposome, a freeze-dried powder injection as well as a preparation method and application of the freeze-dried powder injection. The compound lipidosome comprises a lipidosome membrane and an inner water phase encapsulated in the lipidosome membrane, the paclitaxel palmitate is encapsulated in a lipid bilayer of the liposome membrane; the gemcitabine or the salt thereof is encapsulated in the inner water phase; the compound liposome comprises the following raw materials: paclitaxel palmitate, lecithin, a polyethylene glycol derivative, gemcitabine or a salt thereof, an organic solvent and a buffer solution A; the molar ratio of the lecithin to the polyethylene glycol derivative is 1: (0.01-0.15). The compound liposome disclosed by the invention is relatively high in encapsulation efficiency (especially the encapsulation efficiency of PTX-PA is relatively good) and relatively high in safety, the preparation method is simple and easy to operate, the industrialization degree is high, and the prepared compound liposome has a relatively good long-circulation effect, a relatively good anti-tumor effect and good in-vivo tolerance.

The invention relates to a preparation method of Cr alloyed low-density steel, powder and complex parts, and the Cr alloyed low-density steel is characterized by comprising the following components in percentage by weight: 13% < = Mn < = 43%, 9% < = Al < = 15%, 0.5% < = C < = 1.5%, 4% < = Cr < = 6% and the balance of Fe; on the basis, other elements can be added for strengthening. The preparation method of the complex part comprises the following steps: preparing the powder of the low-density steel through smelting, and preparing the complex part through a powder injection molding process. The sintered blank prepared through the method is of an austenite and ferrite dual-phase structure, a small amount of k-type carbide is contained on the basis of the austenite-based dual-phase structure, the sintering density is smaller than or equal to 6.4 g / cm < 3 >, the yield strength is larger than or equal to 900 MPa, and the ductility is larger than or equal to 5%.

The invention relates to the technical field of ferrous metallurgy and solid waste treatment, in particular to an efficient utilization production process of iron-containing ore powder and slag powder, which comprises the following steps: preheating the iron-containing ore powder ground by a grinder by a preheater, and feeding the iron-containing ore powder into a reduction furnace; a fan provides aerodynamic force, high-temperature gas obtained after air is preheated by a hot-blast stove and hydrocarbon such as pulverized coal sprayed from a pulverized coal feeding port are combusted, and generated reducing gas such as CO and H2 enters a reduction furnace through an annular exhaust outlet of a hearth and is subjected to a reduction reaction with iron-containing ore powder entering the reduction furnace and the high-temperature gas such as CO and H2 at high temperature; and reducing into metal iron powder and slag. Iron ore powder does not need to be made into prefabricated lump ores such as pellets and sinter, and dependence of a blast furnace on metallurgical coking coal is avoided; iron ore powder can be directly used for producing metal iron powder, water is saved, and the risk that high-temperature molten iron explodes when encountering water is eliminated; green hydrogen can be used as a reducing agent, and the method is a preferable scheme in the ferrous metallurgy industry.

The invention relates to the technical field of external refining, in particular to an external refining device and method suitable for desulfurization, degassing and inclusion removal of low-sulfur steel. The external refining device comprises a vacuum chamber, a receiving steel ladle, a carrying-in steel ladle, a water gap and a powder spraying disc; the receiving steel ladle is arranged in a vacuum chamber, a carrying-in steel ladle is arranged above the vacuum chamber, and a water gap is formed in the bottom of the carrying-in steel ladle; a powder spraying disc is arranged at the top of the vacuum chamber, a steel flowing channel is arranged in the middle of the powder spraying disc, and a powder spraying channel is arranged in the powder spraying disc outside the steel flowing channel. The lower end of the water gap extends into the steel flowing channel, and the powder spraying channel is connected with a powder supply and gas supply system through a powder supply and gas supply pipeline. And the vacuum chamber is provided with an argon circulating cooling system. The desulfurizing and inclusion-removing powder is sprayed to the molten steel on the path from the molten steel carried into the steel ladle to the vacuum chamber for pouring of the steel ladle, so that the time for desulfurizing, removing inclusions and degassing in the refining process can be effectively shortened, the refining efficiency is improved, and the production cost is reduced.

The invention relates to a multi-section type heat pipe automatic powder filling machine. The rotating mechanism is arranged below the machine frame, the vibration powder filling mechanism is arranged on the rotating mechanism, the powder cup circulating mechanism and the powder discharging mechanism are arranged on the machine frame and located on the side face of the vibration powder filling mechanism in a staggered mode, and the powder temporary storage mechanism is located over the vibration powder filling mechanism. The lifting mechanism and the rotating mechanism are respectively used for driving the temporary powder storage mechanism to lift and rotate; the height adjusting mechanism is used for adjusting the height of the powder discharging mechanism; the powder discharging mechanism is driven by the height adjusting mechanism, can discharge powder to the vibration powder filling mechanism and the temporary powder storage mechanism and can be filled with at least two different kinds of metal powder. By additionally arranging the temporary powder storage mechanism, powder can be injected into a plurality of copper pipes on the vibration powder filling mechanism at the same time, a large amount of powder injection waiting time is saved, the working efficiency is greatly improved, the structure of the powder discharging mechanism is optimized, the structure of the powder discharging mechanism is simpler and more compact, and the overall size of the powder discharging mechanism is reduced.

The application discloses a converter top gun multifunctional combined injection equipment, which comprises a gas main pipeline, a top gun, a first weighing bin for containing a first powder, a second weighing bin for containing a second powder, a fluidized bed connected with the first weighing bin and the second weighing bin, and a first powder injection bin and a second powder injection bin connected with the fluidized bed, wherein the first weighing bin and the second weighing bin are connected with the gas main pipeline, and the first powder injection bin and the second powder injection bin are connected with the top gun; the first powder is a lime powder or a carbon powder, and the second powder is a lime powder or a carbon powder. The top gun multifunctional combined injection equipment can reduce the consumption of lime and steel materials in the converter process, improve the dephosphorization rate and the quality of molten steel, increase the scrap steel ratio and production efficiency, and realize high efficiency and green smelting. The application further discloses a converter top gun multifunctional combined injection process.

The invention relates to a component (50) obtained by injection molding, in particular from a mixture comprising an adhesive and a powder, the component having a plurality of protrusions (40) protruding from a main surface (241) of the component (50), the plurality of protrusions (40) comprising at least one first rib (41) and at least one second rib (42) intersecting at an intersection point (400) comprising a midpoint (44) of the component (50).

1. Name of the Design Product: Claw of the Unlocking Device. 2. Use of the Design Product: It is used to unlock the powder injection port of the printer so that the powder injection port of the printer is exposed. 3. Design Key Points of the Design Product: It lies in protecting the partial shapes of Design 1 and Design 2. 4. Picture or Photograph that Best Illustrates the Design Key Points: Perspective view of Design 1. 5. Design 1 is designated as the basic design. 6. Other Situations Requiring Explanation: Other Explanation: The yellow part is the main body of the unlocking device, the red part is the claw of the unlocking device, and the red structures of Design 1 and Design 2 are the protected parts.

The application discloses a method for breeding Ptereleotris radiata by using siRNA molecules interfering with melanin tyr gene expression, wherein the sequence of the siRNA molecules is shown as SEQ ID NO. 6-35, and the siRNA molecules can interfere with the expression of melanin tyr gene in the skin tissue of Ptereleotris radiata. The siRNA sequence is designed and synthesized by using the melanin gene of Ptereleotris radiata, and a powder injection preparation containing the siRNA is obtained. The powder injection preparation is dissolved and injected into the body of Ptereleotris radiata. The individuals with faded melanin in the skin tissue of Ptereleotris radiata are screened out for breeding of parent fish and cross breeding, and the offspring of Ptereleotris radiata is obtained, wherein the skin tissue traits of the offspring are the same as those of the parent fish. By using the breeding method provided by the application, the melanin in the skin tissue of Ptereleotris radiata can be reduced and stably inherited, a foundation for obtaining Ptereleotris radiata varieties is laid, and the economic value of Ptereleotris radiata is improved.

The application relates to a compound cefoperazone and avibactam powder injection and a preparation method thereof. The compound powder injection is obtained by uniformly mixing cefoperazone hydrochloride and avibactam sodium, tabletting and crushing. When the powder injection is prepared into an injection solution, the powder injection is easy to disperse and dissolve, is convenient to use, ensures the content of cefoperazone, is not prone to produce beta-lactamase bacterial drug resistance, and has a good market application prospect.

The invention discloses vidarabine monophosphate lipidosome freeze-dried powder injection and a preparation method and application thereof, and belongs to the technical field of medicine, and the lipidosome is composed of vidarabine monophosphate, phospholipid, cholesterol, pegylated phospholipid and a freeze-drying protective agent (such as trehalose). By optimizing a formula and a preparation process, the liposome disclosed by the invention has excellent placement stability and freeze-drying stability, and can still keep good encapsulation efficiency and particle size distribution after long-term storage. By introducing polyethylene glycol (PEG), the retention time of liposome in systemic circulation is remarkably prolonged, and passive targeting enrichment of liver and spleen is reduced, so that the toxicity of immune organs is reduced, and the accumulation of drugs at focus parts is facilitated. The liposome has an excellent slow release characteristic, can improve the antiviral ability and cell entry ability of drugs and reduce toxic and side effects, and is suitable for treating viral infectious diseases, such as hepatitis B, herpes and the like.

The invention belongs to the technical field of biological enzyme preservation, and particularly relates to a bromelain freeze-drying protective agent and a preparation method thereof. The trehalose and pulullan compound freeze-dried powder injection is prepared from the following components in parts by weight: 30 to 50 parts of trehalose, 8 to 10 parts of pulullan, 3 to 10 parts of maltodextrin, 12 to 22 parts of mannitol, 1 to 4 parts of sorbitol, 4 to 12 parts of glycine, 0.05 to 0.2 part of polysorbate-20, 1.5 to 4.5 parts of a buffering agent, 0.2 to 0.8 part of N-acetylcysteine, 0.05 to 0.3 part of oxidized glutathione, 0.8 to 2.5 parts of PEG (Polyethylene Glycol) and 0.05 to 0.3 part of an antioxidant. According to the invention, trehalose-pullulan is taken as a main skeleton, so that the growth of ice crystals is inhibited, and the water activity is reduced; mannitol constructs a crystal phase support network, and polysorbate-20 stabilizes an interface; sulfydryl is temporarily sealed through oxidized glutathione, and controllable reduction during redissolution is realized through microencapsulated N-acetylcysteine; and a sodium phosphate buffer system keeps the pH stable.

The invention relates to the technical field of freeze-dried powder injections, in particular to a polypeptide conjugate fluorescent developer preparation composition as well as a preparation method and application thereof. The polypeptide conjugate fluorescence imaging agent preparation composition is prepared from the following raw materials: a combination of a polypeptide conjugate fluorescence imaging agent raw material medicine, an excipient and a pH buffering agent, and at least one of a solubilizer and a chelating agent is included or not included. By improving the formula and the process of the freeze-dried powder injection, the problems that a polypeptide conjugate fluorescence imaging agent is insoluble and poor in stability are solved, and the formability, the resolubility and the stability are remarkably improved.

The utility model relates to the technical field of pulverized coal preheating, and discloses a preheating device for pulverized coal injection. The preheating device for pulverized coal injection comprises a pulverized coal pipe, one side of the top of the pulverized coal pipe is movably connected with a conveying pipe, a control valve is fixedly installed at the bottom of the middle of the conveying pipe, a heating device is fixedly installed on one side of the control valve, and a connecting pipe is fixedly installed on the top of the heating device; and a mounting valve is fixedly mounted on one side of the connecting pipe, a temperature detector is fixedly mounted at the top of the conveying pipe, and a merging pipe is fixedly mounted at the top of the conveying pipe. Smoke enters through the smoke inlet pipe and then is shunted through the shunting pipe, the shunted smoke is filtered through the two filters, particulate matter in the smoke is filtered out, the problem that the smoke enters the shell to be accumulated and blocked is avoided, the filter on one side can be detached and cleaned by closing the fixed valve and the switch valve on one side, and therefore the smoke purifying device is convenient to use. And the convenience of the preheating device for pulverized coal injection is improved.

This application discloses a method for offline analysis of powder ionization conditions, comprising the following steps: placing a silicon wafer on a target plate of a plasma device; generating a plasma beam under preset powder ionization conditions using the plasma device; injecting powder into the plasma device so that the plasma beam bombards the powder until powder injection is complete; detecting whether a first condition and a second condition are met, wherein the first condition includes at least 70% of the powder injected into the plasma device ablation and brightening upon bombardment by the plasma beam and / or forming a coating on the silicon wafer; the second condition includes the coating containing chemical bonds formed by elements of the powder and / or detecting spectral lines generated by ionization of the powder upon bombardment by the plasma beam. If the first and second conditions are met, the powder is determined to be effectively ionized. Otherwise, the powder is determined to be ineffectively ionized. The method of this application can obtain basic research data on the boronization of boron powder.

A powder treating apparatus using microwave torch plasma having a high edge area density is disclosed. The powder treating apparatus includes a microwave waveguide, wherein when a dominant mode waveguide for transmitting an electromagnetic wave of a specific frequency is a, the microwave waveguide has a width of na, where n is an integer greater than or equal to 2; a discharge tube vertically extending through the waveguide such that all of two or more peaks of an electric field distribution within the waveguide are positioned in an inner space of the discharge tube; a plasma discharge gas injection unit disposed at a side of one end in a vertical direction of the discharge tube and configured to inject the plasma discharge gas into the discharge tube; and a treatment target powder injection unit disposed at a side of the other end in the vertical direction of the discharge tube and configured to inject the treatment target powder into the discharge tube.

The invention relates to the technical field of ceramic metal powder production, and provides a ceramic metal powder injection-compression molding, blanking and demoulding all-in-one machine which comprises a tray feeding device, a turnover device and a discharging device. The mold discharging device is used for feeding a mold into the overturning device, and the mold is internally provided with a product formed through injection molding of ceramic metal powder. The overturning device is used for locking the mold, arranging the tray above the mold, pressing the tray at a forming notch of the mold, enabling the tray and the mold to overturn at the same time, separating the mold from the tray up and down, enabling the product to fall off from the mold to the tray, overturning the mold again after the tray is pushed out, and unlocking the mold; the pushing device is used for pushing the tray to the discharging device from the overturning device, the tray bears the product, and then the mold is pushed to the mold returning device from the overturning device. The automatic turnover demolding machine has the advantages that the turnover device automatically receives the mold and the tray for turnover demolding, and the tray and the mold are automatically and separately conveyed out under the cooperation of the pushing device and the turnover device.

The pre-encapsulation quantitative injector comprises a needle cylinder, a push rod and a push rod plug, the needle cylinder is internally provided with an injection cavity which is through front and back, the head end of the injection cavity is provided with an encapsulation connector, the tail end of the injection cavity is provided with the movable push rod, and the push rod plug is arranged at the tail end of the injection cavity. The head, arranged in the injection cavity, of the push rod is sleeved with the push rod plug; the head end of the needle cylinder is provided with an installation connector used for installing a needle head, and the installation connector is arranged on the outer side of the packaging connector in a wrapping mode. A sealing rubber plug is arranged on the inner side of the packaging connector, and liquid medicine is pre-filled and packaged between the sealing rubber plug and the push rod plug. And the inner diameter of the injection cavity is smaller than that of the mounting joint. According to the needle cylinder, by controlling the inner diameter size of the injection cavity in the needle cylinder, a user can conveniently and accurately grasp the medicine injection dosage after liquid medicine is mixed with medicine powder, and the needle cylinder structure matched with the universal two-end needle is designed according to the size of the injection cavity.

The present application relates to the technical field of medicine, in particular to a safe and stable nimodipine for injection and a preparation method thereof, and provides a nimodipine cyclodextrin freeze-dried powder injection containing sulfobutyl ether-beta-cyclodextrin, which can significantly improve the solubility, drug safety and dilution stability of nimodipine, increase the compliance of patients and the convenience of clinical use. Compared with the commercially available nimodipine injection, the safety and dilution stability of the present application are significantly improved, and the present application has obvious advantages.

The invention discloses a green low-carbon smelting reduction short-process smelting process and system. The green low-carbon smelting reduction short-process smelting process comprises the following steps: 1) screening an iron-containing material into an iron-containing fine material and an iron-containing coarse material; the iron-containing fine material is fed into a mineral powder blowing device; carrying out hydrogen group pre-reduction on the iron-containing coarse material, and mixing the iron-containing coarse material with an iron-containing fine material to obtain an iron-containing mixture; 2) grinding and drying the reduced material to obtain reduced powder; 3) cooling high-temperature coal gas discharged from the smelting reduction smelting furnace through heat exchange, purifying the coal gas into clean coal gas, and pressurizing one part of the clean coal gas into high-pressure clean coal gas; 4) taking a part of the high-pressure clean gas as injection carrier gas of the reduction powder, and injecting the reduction powder into an iron bath molten pool of the smelting reduction smelting furnace; the other part of the high-pressure clean gas is used as injection gas to inject the high-temperature gas, and the injected mixed injection gas is used as injection carrier gas of the iron-containing mixture. The method has the advantages of being short in process, low in carbon, green, environmentally friendly and the like, and the green and low-carbon smelting purpose of short smelting reduction process can be achieved.

The utility model discloses a slotting powder spraying device for a powder spraying system, and relates to the technical field of powder spraying devices. The device comprises a bottom plate, wherein the top of the bottom plate is in transmission connection with a conveying belt; a powder spraying assembly is arranged at the top of the bottom plate and comprises a box body, the box body is fixedly connected to one side of the top of the bottom plate, a rotating rod is arranged in the box body, vertical plates are fixedly connected to the two sides of the surface of the rotating rod, and nozzles are fixedly connected to the bottoms of the vertical plates. The transmission motor works to drive the transmission rod to rotate so as to drive the rotating plate to rotate, the rotating plate drives the connecting rod to rotate through the rotating shaft, the connecting rod drives the sliding plate to move through the rotating shaft, the sliding plate drives the movable rod to swing, the movable rod drives the rotating rod to rotate, the rotating rod drives the vertical plate to swing, and the vertical plate drives the nozzle to swing. Therefore, the spraying uniformity and the coverage range are improved, and the problem of uneven spraying caused by a traditional fixed nozzle is solved.

The utility model discloses a bi-component medicine powder racking machine which comprises a racking mechanism, the racking mechanism comprises a first powder injection part, a second powder injection part and a racking rotating disc capable of rotating, and a plurality of racking stations are arranged on the racking rotating disc. The first powder injection part and the second powder injection part are arranged above the subpackaging rotary disc in a spaced mode and used for injecting powder into the subpackaging bottles in the different subpackaging stations, and the multiple subpackaging stations are distributed in the circumferential direction of the subpackaging rotary disc at intervals. The utility model has the advantages of simple structure and low cost. The utility model has the advantages of simple structure and low cost.

The utility model belongs to the technical field of pulverized coal injection devices, and particularly relates to a wear-resisting and deformation-resisting pulverized coal spray gun which is provided with a high-temperature end gun barrel assembly, a low-temperature end steel pipe and a pulverized coal inlet wear-resisting steel pipe. The other end of the low-temperature end steel pipe is connected with one end of a pulverized coal inlet abrasion-resistant steel pipe, a cold-end protection steel pipe is welded to the outer portion of the connecting position of the low-temperature end steel pipe and the pulverized coal inlet abrasion-resistant steel pipe, and the high-temperature end gun barrel assembly is formed by connecting an inner composite ceramic steel pipe, a middle-layer anti-deformation steel pipe and an outer-layer anti-deformation steel pipe in a sleeved mode from inside to outside. A high-temperature end protection steel pipe is arranged outside the high-temperature end gun barrel assembly and the low-temperature end steel pipe, and two shock-stopping balls are welded outside the high-temperature end protection steel pipe; the utility model has the beneficial effects of strong anti-deformation capability, wear resistance, long service life, high production efficiency, convenience in installation and the like.

A contrast agent powder injection capable of forming a supersaturated solution in absolute ethanol, comprising a contrast agent and a crystallization inhibitor. The contrast agent powder injection is an amorphous product, and can significantly increase the solubility of the contrast agent in absolute ethanol. In the contrast agent powder injection, the crystallization inhibitor can increase the stability of the supersaturated solution, change the viscosity of the supersaturated ethanol solution, and prolong the retention time in the blood vessel. Further provided are a preparation method for and use of the contrast agent powder injection. The contrast agent powder injection can achieve real-time and dynamic monitoring of the flowing direction of absolute ethanol and prevent ethanol from overflowing into normal tissues with the help of digital subtraction angiography and other instruments in the sclerotherapy process, thereby achieving the effects of precise and visualized treatment and reduction of treatment risks and complications. Meanwhile, the viscosity of the ethanol solution can be increased, prolonging the contact time with the blood vessel wall and the acting time and enhancing the efficacy of ethanol sclerotherapy.

The invention belongs to the technical field of coal gas heating, and particularly discloses a metallurgical coal gas staged heating system and method, and the metallurgical coal gas staged heating system comprises a first-stage electric heating device and a second-stage electric heating device which are connected in sequence. The first-stage electric heating device adopts a resistance tube heating mode to preliminarily heat the metallurgical gas to 800 DEG C; the second-stage self-heating device is used for carrying out combustion reaction with high-temperature coal gas by blowing oxygen and carrying out quenching and tempering under the assistance of pulverized coal blowing, and finally, the coal gas is heated to 1400 DEG C or above. Thermocouples are arranged in the system to monitor temperature and pressure, and heating power and reaction gas flow are dynamically adjusted through a central controller, so that accurate temperature control is realized. Meanwhile, the system is provided with nitrogen switching, steam injection carbon deposition prevention and multiple safety protection facilities, the problems of insufficient temperature rise precision, high energy consumption, poor safety and the like in the prior art are solved, and efficient, safe and stable preparation of the high-temperature coal gas is achieved.

The invention discloses a water-soluble degreased metal powder injection molding process, which belongs to the technical field of metal powder injection molding, and comprises the following steps: pre-drying metal powder; the preparation method comprises the following steps: weighing the following raw materials in parts by weight: 40-60 parts of polyethylene glycol, 0-15 parts of high-density polyethylene, 0-30 parts of polypropylene, 10-30 parts of polymethyl methacrylate, 0-5 parts of polyformaldehyde, 0-7 parts of ethylene-vinyl acetate copolymer, 1-5 parts of stearic acid, 0-10 parts of dioctyl phthalate and 0-10 parts of maleic anhydride grafted polypropylene; performing mixing; dicing is performed; injection molding; degreasing is conducted; performing drying; and sintering. By optimizing a mixed binder formula and a feed preparation process, the fluidity stability of the feed is effectively improved, the feed is prevented from being adhered in a screw rod of an injection molding machine, the continuous and smooth charging barrel feeding and mold filling processes are ensured, the forming interruption or equipment cleaning frequency caused by the feeding problem is reduced, and the production efficiency is improved. And the batch production requirement of metal powder injection molding is met.

The invention discloses a method for producing low-nitrogen ultralow-sulfur steel by spraying powder on an RH furnace, which comprises the following steps of: vacuumizing after RH furnace molten steel enters a station, controlling the vacuum degree of a vacuum chamber of the RH furnace to be less than 10kPa, and then spraying denitrification powder for denitrification, adjusting components and spraying desulfurization powder for desulfurization to obtain the low-nitrogen ultralow-sulfur steel with the nitrogen content of less than or equal to 30ppm and the sulfur content of less than or equal to 30ppm. The problems that the denitrification efficiency of a traditional RH furnace is limited, and desulfurization and denitrification coupling control means are lacked are solved, and low-nitrogen ultra-low-sulfur steel is produced through the RH furnace.