40results about How to "Act as a reducing agent" patented technology

The invention discloses a reduction method based on a reduction pretreatment process and used for the iron oxide scale of hot-rolled strip steel. The reduction method comprises the following steps: rapidly heating the hot-rolled strip steel to 400-550 DEG C at a speed of 80-150 DEG C / s; carrying out isothermal reduction for 30-600s, wherein the reduction product is multigap sponge iron; after intermediate cooling, heating to 700-1100 DEG C at a speed of 80-150 DEG C / s; and carrying out isothermal reduction for 30-600s, wherein iron particles in the multigap sponge iron are mutually bound, thecrystal grains grow, the gaps, air holes and crystal boundaries in the reduction product are gradually reduced through material transfer, the total volume is reduced, a compact multi-crystal pure ironlayer with a microstructure is formed, and reduction for the iron oxide scale is completed. The reduction method is capable of remarkably increasing the reduction efficiency for the iron oxide scaleof the hot-rolled strip steel in a continuous annealing furnace, and capable of obtaining lots of reduced pure iron in a short reduction time, so that the influence of the residual of the iron oxide scale on the formability and adhesivity of the subsequent plated layer is avoided, and then the industrial promotion of a pickling-free reduction annealing hot-galvanizing prototype technology is ensured.

The invention relates to a blister copper blowing process in the technical field of blister copper smelting, which comprises mixing copper-containing waste and copper-containing waste treatment tailings, adding them to a side-blowing melting and incinerator, and adding a cosolvent, a reducing agent, and a fuel, At the same time, oxygen is blown in, and mixed blowing is carried out at 1200-1250°C; finally, blowing tailings, blister copper and flue gas are discharged separately, and the flue gas is discharged after treatment. Limestone has a low melting point, which can promote the melting of quartz stone and iron oxide and improve fluidity. Iron, molybdenum, magnesium, calcium, silicon, etc. in the furnace charge are oxidized in an oxygen-rich environment to form oxides, which combine with quartz stone to form tailings, and realize the separation of non-copper metal elements from copper. Iron oxide can convert copper oxide and copper in copper sulfide Reduction, increase copper content, semi-coke as fuel, high fixed carbon, sufficient energy for combustion, high chemical activity, and can also function as a reducing agent; the combination of these can increase the reduction rate of copper.

The invention proposes a Pt-rare earth alloy material and its preparation method and application, belonging to the technical field of fuel cell material preparation, which is composed of small particles with an average particle diameter of 5-7nm and has a face-centered cubic structure. The average particle size of the flower-shaped particles is 23-26nm. The Pt-rare earth alloy material is a single alloy phase and the Pt-rare earth alloy material is surrounded by {111} crystal planes. The Pt-rare earth alloy material of the present invention has a definite morphology and structure, and presents a single alloy phase, has good dispersion and uniformity, and has superior performance when it is used as an active component in the fuel cell cathode oxygen reduction reaction. Catalytic activity and stability.

The invention relates to a method for preparing a foam aluminium sandwich structure. Foam aluminium is processed into samples of any required size by using wire cutting or other machining methods. The method comprises the following steps: performing derusting and deoiling treatment on the surface of the foam aluminium; mixing k3AlF6 and KAlF4 in a ratio of 1:1-2, heating the mixture till the mixture is in a molten state, cooling the mixture for crystallization, grinding crystals into powder, adding water into the powder to prepare a suspension in a ratio of 1:2 to 4, and spreading the suspension on the surface of a foam aluminum work piece uniformly; and putting the treated foam aluminum work piece in a mold, placing the mold in a furnace at the temperature of between 520 and 585 DEG C, keeping the temperature for 2 minutes, taking the mold out, injecting molten alloy melt heated to 500 to 580 DEG C into the mold, and cooling the melt to obtain the foam aluminum sandwich structure. The method for preparing the foam aluminum sandwich structure has the characteristics of high preparation efficiency, simple process, low cost and easy realization of line production.

The invention provides a method for directly preparing Mg-Zr alloy by electrolyzing MgCl2, K2ZrF6 and ZrO2. KCl and K2ZrF6 are dried under 600 DEG C, and anhydrous MgCl2 and KF are dried at 130 DEG C under the vacuum condition; KCl, K2ZrF6, anhydrous MgCl2, KF and ZrO2 are ground and mixed evenly in the ratio of 35 percent to 45 percent : 5.3 percent to 15 percent:35 percent to 45 percent:0.1 percent to 4.5 percent:2 percent to 4 percent, and then heated and melted in an electrobath; a metal molybdenum wire is taken as the cathode, a cathode product collecting sleeve is arranged on the cathode, a graphite rod is taken as the anode, the electrobath temperature is between 650 DEG C and 800 DEG C, the cathode current density is 6A / cm<2> to 13A / cm<2> and the electrobath voltage is 5V to 9V; the temperature is preserved for 10min to 40min after one hour of electrolysis, and the Mg-Zr alloy is deposited near the cathode in the molten salt electrobath; the whole process is carried out underthe protection of argon. With the method, even alloy components can be obtained; and the method solves the technical difficulty of component segregation of the Mg-Zr intermediate alloy, and is characterized by greatly shortened technological process, low operation temperature and low production cost.

The invention relates to a nanomagnetic material of iron oxide and the fabrication method, and belongs to the nano-material fabrication field; the invention adopts glycol as a solvent and a reducing agent, and adopts sodium dodecyl benzene sulfonate as a surfactant, and adopts dissoluble trivalent iron sodium and alkali as a raw material, a mixing process under a room temperature is conducted to make a homogeneous suspension; the mixed liquid is turned into a polytetrafluoroethene lining to conduct a microwave water thermal reaction, after the reaction is over, the product from the reaction is separated, washed and dried to make a precursor nano-powder which is calcined to make a ferroferric oxide nano-powder or gamma ferric oxide nano-powder; the nano-powder body has a hollow ball structure assembled by a nano-piece, the hollow ball dimension is two to four micron while the inner hollow dimension of the hollow ball is one to three micron; the invention is characterized in low raw material cost, easy process, easy operation, controllable profile and so forth; the specific surface area is high, the magnetic performance is favorable.