31results about How to "Shorten the reduction reaction time" patented technology

The invention discloses a system of inductive heating continuous magnesium smelting and a continuous magnesium smelting technique. The system comprises a continuous feeding device, an inductive heating reaction chamber, a magnesium steam condensing device and a continuous discharging device; wherein the feeding device consists of a feeding housing and a spiral feeding mechanism, the reaction chamber comprises an inductive heating winding, a heating element, a clapboard with holes and a slag cooling device, the condensing device consists of a mesh clapboard, a dust deposition chamber, the magnesium steam condensing chamber, the continuous discharging device comprises spiral slag discharging mechanism and slag housing. The continuous magnesium smelting technique consists of the processes of the continuous feeding of reacting burden into the reaction chamber, the continuous condensation of the magnesium steam and the discharge of liquid magnesium, and also comprises steps of the continuous feeding of reacting slag into the slag housing and slag discharging. The invention has high heat energy utilization rate, and can realize the low cost continuous production of the metal magnesium.

The invention discloses a magnesium reduction process through a micro-wave heating silicothermic method; the process comprises the following steps: 1. dolomite calcinations: the dolomite is heated to 1100 DEG C to 1200 DEG C and becomes calcined dolomite; 2. the calcined dolomite, silicon nitride powder and fluorite powder are weighed, mixed, milled and then pressed into a ball which meets technological requirements; 3. the ball is put into a closed non-metal reduction tank of a micro-wave heating oven to be heated under 1000 DEG C to 1200 DEG C, so that the magnesium compound in the ball reacts with the silicon nitride powder; 4. the vacuum degree of the closed non-metal reduction tank is kept to be 13.3Pa or higher for 4h to 6h; magnesium vapor is condensed in a condenser and becomes crude magnesium; 5. the crude magnesium is heated, melted and refined by solvent, to obtain refined magnesium; 6. acid washing and the like. The method evenly and quickly heats in the principle of micro-wave heating with high heating efficiency, is easy to be controlled, saves production cost, is safe, environment protective and harmless.

The invention elates to the technical field of inorganic chemical application, and specifically relates to a method for preparing graphene through ball mill aided oxidation and reduction. The method comprises the following steps: 1, preparing graphite oxide; and 2, preparing a graphene oxide solution through the graphite oxide obtained in step 1, and then refluxing to obtain graphene. With the adoption of the method, the time of subsequent refluxing reduction reaction is reduced, the efficiency of preparing graphene by the oxidation and reduction method is increased, and the reduction degree of graphene oxide is raised.

The invention discloses a method for continuously preparing metal samarium through direct thermal reduction, and belongs to the technical field of nonferrous metallurgy. The preparation method comprises the following steps: Sm2O3, Al, CaO or MgO are mixed, wherein a reducing agent is Al, and can be replaced by an Si-Fe alloy with 75 mass% of Ca or Si; the batching and the pelletizing are performed; and then, the high-temperature reduction reaction is performed for pellets in flowing inert gas or nitrogen atmosphere; and finally, high-temperature samarium steam carried out by flowing inert carrier gases or nitrogen in a high-temperature reduction furnace is condensed to obtain the metal samarium. The method adopts the relative-vacuum manner, cancels a vacuum system and a vacuum reduction tank, realizes the continuous preparation of the metal samarium, shortens the reduction period, and improves the preparation efficiency; the recovery rate of the metal samarium can reach above 97%; as the energy consumption is obviously reduced, the method is a novel energy-saving green process for preparing the metal samarium with low cost; and the method is simple in operation, is simpler in equipment, is low in requirement, and reduces the equipment investment and the operation cost.

The invention discloses a method for improving material heating speed in a reduction kettle for vacuum metal smelting, which comprises the following steps of: arranging heat conductors (1) on the wall of a reduction kettle for vacuum metal smelting or on a radiation pipe (2) penetrating in the reduction kettle, thus increasing the contact area between the radiation pipe and a reduction material in the reduction kettle, reducing the heat conduction distance between the radiation pipe and the reduction material and improving the heating speed of the reduction material. By arranging the plurality of heat conductors on the kettle wall and on the radiation pipe connected with the reduction kettle, the invention can increase the contact heat conduction area between the radiation pipe and the reduction material in the reduction kettle for vacuum metal smelting, shorten the heat conduction distance from the reduction material and improve the heating speed of the reduction material, thus improving heat utilization rate, achieving energy saving effect, reducing reduction reaction time and improving the production capacity.

The invention discloses a carbon-containing pellet reducing system and method. The carbon-containing pellet reducing system comprises a dechlorination device, a first material mixer, a first pelletizer, a second pelletizer, a pellet drying machine and a rotary hearth furnace, wherein a thermal dechlorination plastic outlet of the dechlorination device is connected with a thermal dechlorination plastic inlet of the first material mixer; a first mixture outlet of the first material mixer is connected with a first mixture inlet of the first pelletizer; a primary pellet outlet of the first pelletizer is connected with a primary pellet inlet of the second pelletizer; a compound pellet outlet of the second pelletizer is connected with a compound pellet inlet of the pellet drying machine; a dry pellet outlet of the pellet drying machine is connected with a dry pellet inlet of the rotary hearth furnace. According to the carbon-containing pellet reducing system and the method which are disclosed by the invention, waste plastic is fully used, the porosity of compound pellets is increased, generation of harmful substances is avoided, the use amount of coal ash is reduced, and the energy consumption of the rotary hearth furnace is reduced.

The invention discloses a vacuum regenerative and reduction furnace system for metal smelting, which comprises a reduction furnace (1), a reduction kettle (2), a regenerative burning system and a liquid-state metal collection system. The reduction kettle with a bevel bottom structure is provided with a radiation pipe (3) penetrating in the reduction kettle and is arranged at the middle section of the reduction furnace to divide the reduction furnace into an upper or a left combustion chamber (4) and a lower or a right combustion chamber (5), and the two combustion chambers are communicated with each other through the radiation pipe (3), so that the hot smoke in the combustion chambers can pass through the radiation pipe (3). The two combustion chambers are respectively connected with each other a regenerative combustion system, which is used for storing the heat of smoke discharged from the reduction furnace after heating materials through the radiation pipe and for controlling the alternate combustion of the combustion chambers and the flow direction of the high-temperature gas in the radiation pipe. A reduction material in the reduction kettle produces a metal vapor after reduction reaction, and the metal vapor is collected by the liquid-state metal collection system and is directly cast or conveyed to a refining furnace. The invention has the advantages of high heat utilization rate, good power saving effect, complete combustion and short reduction reaction time.

The invention discloses a method for eliminating local differential pressure in a vacuum smelting reduction kettle, which comprises the following steps of: arranging a metal vapor vacuum pumping hole or a crystallizer interface on the reduction kettle; and disposing a metal vapor guide channel in the reduction kettle, so that the metal vapor can escape into a metal collector or the crystallizer along the guide channel. The reduction kettle (4) adopted by the method has a rectangular or round box body with a bevel bottom structure and has a bottom inclined by an angle of 30 to 60 DEG. The metal vapor vacuum pumping hole (6) is provided on the kettle body on the highest point side on the top of the reduction kettle, an air guide groove (2) pointing to the metal vapor vacuum pumping hole is provided on the inner wall of the reduction kettle, a radiation pipe (1) with the air guide groove and penetrating in the kettle is vertically or horizontally arranged in the reduction kettle, or an air guide groove is provided on a heat conductor arranged on the radiation pipe. The invention can effectively eliminate local differential pressure in the vacuum smelting reduction kettle to successfully guide the metal vapor produced by reduction reaction, thus holding the pressure environment in the reduction kettle and ensuring the smooth execution of the reduction reaction.

The invention relates to an air cooling device for a large cover of a titanium sponge I-type reactor, which comprises a cover plate, air cooling areas are distributed on the left side and the right side of the cover plate, one air cooling area is provided with an air inlet, the other air cooling area is provided with an air outlet, the middle part of the cover plate is provided with a feed port, an air distribution plate is arranged below the cover plate through a connecting plate, and the air distribution plate is provided with an air outlet. The air inlet and the air outlet penetrate through the air distribution plate, the air inlet is located above the air distribution plate, air distribution plate outlets are evenly formed in the air distribution plate, a guide plate is vertically arranged between the upper side of the air distribution plate and the cover plate on the lower side of the air inlet, and a temperature measuring opening is formed in the bottom of the cover plate. The device can monitor and reduce the surface temperature of the large cover, avoids high-temperature deformation, improves the feeding speed, shortens the reduction reaction time, and is high in safety coefficient.

The invention discloses a reduction kettle, comprising a kettle body (1) which appears as a box or cylinder structure. The bottom or top part of the kettle body is arranged in an inclined form. Radiation pipes (2) arranged to be parallel with both the front and back side walls of the reduction kettle or in a horizontal array form run through the kettle body. A slag draining port (3) is arranged on the side kettle body of the lowest point of the kettle bottom part, and an assistant slag draining port (4) is arranged on the kettle body, namely on a position where the highest point of the kettle bottom is opposite to the slag draining port. A charging inlet (5) is arranged on the highest point of the top part of the kettle body, and a metal steam vacuum adsorbing port (6) is arranged on the side kettle body of the highest point of the kettle body top. The invention can reduce reduction action time, enhance manufacturing capability, and also can reduce energy cost. The invention prolongs the service life of reduction kettle. The design of the invention leads slag draining to be easier and can enhance slag draining efficiency and reduce heat energy loss. The collection of the metal steam becomes convenient and the purity of the products is high.

The invention discloses a reduction method of methanol synthesis catalyst. The reduction method comprises the following steps: conveying hydrogen from a gas storage tank of a hydrogen drainage and irrigation vehicle to a hydrogen depressurizing valve of the hydrogen drainage and irrigation vehicle to depressurize; conveying hydrogen after the depressurizing treatment to a synthesis gas compressor through a general hydrogen supplementing pipe to boost; conveying the synthesis circular gas containing hydrogen and nitrogen to a nitrogen inlet of the synthesis gas compressor so as to mix with the hydrogen after the boosting treatment, wherein the volume percent of every component in the synthesis circular gas is: 0.3-0.5% of hydrogen and 99.5-99.7% of nitrogen; conveying the mixed gas to a catalyst bed layer of a methanol synthesis reactor through a gas conveying pipe to participate in the reduction reaction. By adopting the technical scheme of the invention, the reduction reaction speed is accelerated, the reaction time is saved, and working efficiency is improved; the system is completely and stably ran without a series of assistant systems and the gas required by reduction is supplied, and thus cost is saved.

The invention relates to a preparation process for 4-trifluoromethoxy. The preparation process comprises the followings steps of: (1) undergoing a nitridation reaction on o-toluidine serving as a starting raw material to obtain benzene diazonium chloride; (2) further undergoing a reduction reaction on the benzene diazonium chloride obtained in the step (1) under the action of a reducing agent to obtain a reduction product; and (3) undergoing a hydrolysis reaction on the reduction production obtained in the step (2) under the action of hydrochloric acid to generate 2-procarbazine hydrochloride, wherein particularly, in the step (2), the reduction reaction is undergone by taking sodium pyrosulfite as a reducing agent under the condition that the temperature is 15-25 DEG C and the pH is 7-9. A method disclosed by the invention has high yield, production period can be shortened, and production cost is lowered simultaneously.