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

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 discloses a set of induction heating continuous magnesium smelting device and continuous magnesium smelting process. The device includes a continuous feeding device, an induction heating reaction chamber, a magnesium steam condensing device and a continuous slagging device; wherein, the feeding device is composed of a silo and a screw feeding mechanism, and the reaction chamber is composed of an induction heating coil, a heating element, a belt The baffle plate of the hole and the slag cooling device are composed. The condensing device is composed of a baffle plate with a mesh structure, a dust settling chamber, and a magnesium steam condensing chamber. The continuous slag discharge device includes a spiral slag pushing mechanism and a slag bin. The continuous magnesium smelting process includes the continuous push of the reaction charge into the reaction chamber, the continuous condensation of magnesium vapor, and the discharge of liquid magnesium, as well as the continuous entry of reaction slag into the slag bin and slag discharge. The invention has high thermal energy utilization rate and can realize continuous production of metal magnesium at low cost.

The invention discloses an aluminum-barium wire and a production process thereof. The aluminum-barium wire comprises a coating and a core powder, wherein the core powder comprises (wt%) 70 to 80% of aluminum powder, 5 to 10% of aluminum granules and 15 to 25% of barium carbonate, and the coating is made of strip steel. The production process comprises a step of preparation of a core material and a step of coating. The aluminum-barium wire produced in the invention is hard to break off, can realize in-depth deoxidation, reduces loss of elemental aluminum and barium, improves an alloy recovery rate and decreases cost for each ton of steel.

The invention discloses an electric heating method for a reducing pot and the reducing pot used by the method, wherein, a heat conductor is arranged inside a pot body of the reducing pot; an electrical bar is embedded into the heat conductor; heat generated after the electrical bar is electrified is conducted through the heat conductor, and reducing materials in the reducing pot are heated. The reducing pot (1) takes the structure of a cylinder, wherein, a charging hole is arranged on one end of the reducing pot; the other end of the reducing pot is closed or provided with a slag notch; the heat conductor (2) is arranged inside the reducing pot (1); the heat conductor (2) and the inner wall of the reducing pot (1) are integrated into a whole or the heat conductor (2) is a movable structure which is closely embedded and sleeved into the reducing pot (1); shape and set mode of the heat conductor (2) are random; the electrical bar (3) is embedded into the heat conductor (2). The invention can be used for auxiliary heating of the prior heating method and also can be completely used for electric heating, and has the advantages of great reduction of reaction time of reducing materials, improvement of production rate per unit time, reduction of production cost and capability of reducing environmental pollution.

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 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 ofthe 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 eachother 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 rapid reduction process of a rotary kiln for laterite nickel ore. The rapid reduction process of the rotary kiln for the laterite nickel ore includes the following steps that laterite nickel ore and a composite adding agent are mixed and then are pressed into block masses, and the composite adding agent comprises pulverized coal and limestone; the block masses are dried and pre-heated, and then enter the rotary kiln, reduction coal is added in, and reduction is performed under the reduction atmosphere so that reduced products can be obtained; the reduced products are cooled, screened and magnetically separated so that magnetic products can be obtained; and the magnetic products are crushed, subjected to ore grinding and magnetically separated, and high-nickel concentrate is obtained. According to the rapid reduction process of the rotary kiln for the laterite nickel ore, the low grade laterite nickel ore serves as raw materials, three manners that fuel is matched in the block masses, the block masses are preheated in a vertical furnace and coal is fed through hot air are developed to guarantee that the laterite nickel ore block masses are contained in the kiln while being hot, high temperature rapid reduction of the whole kiln is achieved, and therefore the rotary kiln temperature is lowered, the reduction time is shortened, and the high-nickel concentrate is effectively manufactured from the low grade laterite nickel ore.

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 magnetically immobilized yeast cell and its application in the preparation of (R)-2-hydroxy-4-phenylbutyrate ethyl ester. The magnetically immobilized yeast cell is made of lysine-modified magnetic nano The particles are mixed with the yeast cell solution, fixed in a shaker at 20°C-40°C, 130-170r / min for 2-6h, after the reaction, magnetically separated, the precipitate is washed with deionized water, and freeze-dried to obtain magnetically immobilized yeast cell. The immobilization method of the invention effectively improves the stability of the yeast cells and enhances the tolerance of the cells to the substrate solution. Under the action of an external magnetic field, the magnetically immobilized cells are easier to separate from the reaction system, which is beneficial to the separation and extraction of products and simplifies the process flow. Appropriate magnetic field frequency and magnetic field strength in the alternating magnetic field reactor can effectively enhance the mass transfer process of the reaction system, significantly shorten the reduction reaction time, and then improve the biotransformation efficiency.

The invention discloses a reduction kettle, which comprises a kettle body (1), the kettle body is a box body or a cylinder structure, the bottom or the top of the kettle body is arranged at an inclination, and the front and rear side walls of the reduction kettle in the kettle body are arranged in parallel or in a horizontal array The radiant tube (2) runs through the kettle body, a slag discharge outlet (3) is provided on the side kettle body at the lowest point of the bottom of the kettle body, and an auxiliary slag discharge outlet (3) is provided on the kettle body opposite to the slag discharge outlet at the highest point of the bottom of the kettle body ( 4), the highest point on the top of the kettle body is provided with a charging port (5), and the kettle body on the side of the highest point on the top of the kettle body is provided with a metal vapor vacuum exhaust port (6). The invention can reduce reduction reaction time, improve production capacity and reduce energy consumption. Extend the service life of the reduction kettle. The slag discharge is easier, which can improve the slag discharge efficiency and reduce the loss of heat energy. The collection of metal vapor is convenient. The product has high purity.

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.

A process for producing reduced ilmenite in a rotary kiln. The ilmenite, reducing agent, and desulfurizing agent are prepared as raw materials, added to the rotary kiln, and heated to 1050-1180°C in a reducing atmosphere for reduction. The pressure of the reducing atmosphere is kept at Between 0-4mm water column, obtained by cooling, screening, magnetic separation, impact winnowing, and blending. The weight ratio of reducing agent and ilmenite in the raw material is 0.3-0.6:1, and the weight of desulfurizing agent and reducing agent The ratio is 0.02~0.2:1. The method realizes continuous flow operation, greatly improves production efficiency, shortens the reduction reaction time, and is easy to control the uniformity of temperature, thereby ensuring stable product quality and meeting the needs of producing welding electrodes.

The invention discloses an environmentally-friendly synthetic method for the metal nanoparticle, and belongs to the field of the nanometer material. The existing ingredients in a microorganism nutrient solution are used as reducing agent, stabilizing agent and morphological control agent to synthetize metal nanometer material in one step. The environmentally-friendly synthetic method for the metal nanoparticle comprises the following steps of: (1) blending a reducing stable morphology control agent solution, and meanwhile, adding sodium chloride or dipotassium phosphate; (2) regulating the pH (potential of hydrogen) value of the solution to 2-13; (3) adding the soluble metal salt water solution of the metal nanoparticle while stirring the solution; and (4) at the temperature of 15-50DEG C, reacting for 5 seconds to 24 hours to obtain the metal nanoparticle. The environmentally-friendly synthetic method for the metal nanoparticle, which is disclosed by the invention, has the moderate reaction condition, short synthesis time and low production cost, the particle diameter of the obtained metal nanoparticle is 1-100nm, the particle diameter of the nanometer material is relatively even, and the morphology of the generated metal nanoparticle can be controlled. Compared with the biosynthesis method, the environmentally-friendly synthetic method for the metal nanoparticle is simpler, efficient and environmentally-friendly.