35results about How to "Increase the rate of the reduction reaction" patented technology

The invention relates to alloy steel smelting, and particularly relates to a chrome-molybdenum metal self reduction pellet and preparation and direct steel liquid alloying methods thereof. The pellet comprises the following components according to mass percentage: 40-65 percent of high-carbon ferrochrome powder, 15-40 percent of molybdic oxide powder, 5-15 percent of a reductant and 3-5 percent of a flux. The self reduction pellet product is added to a ladle during electric furnace or convertor tapping, under the action of high-temperature molten steel and a pellet inner reductant, metal elements in the pellet are effectively reduced, as a result, the molten steel is directly alloyed; the self reduction pellet product is applied in alloy steel including stainless steel, wear resistant steel and the like, which contain elements Cr and Mo, and not only is the procedure for the production of ferro molybdenum saved, but also the elements Cr and Mo can be added at one time, so that the cost of adding alloy elements is lowered, the smelting cycle is shortened, meanwhile, the use range of high-carbon ferrochrome is widened, and furthermore, the problem that the element Mo is difficult to add and settle and great in volatilization during the steel smelting is solved.

The invention discloses a method for preparing Fe2O3 nano-rod array electrodes by means of in-situ vulcanization and carbon coating and application of the Fe2O3 nano-rod array electrodes. The method includes sintering titanium sheets, iron chloride and sodium sulfate by a hydrothermal synthesis process to obtain nano-rod-shaped Fe2O3 arrays; vulcanizing iron sesquioxide by the aid of thiourea or thioacetamide by solvothermal process to obtain Fe2O3-S; carrying out carbon coating on the Fe2O3-S by plasma-enhanced chemical vapor deposition process to obtain Fe2O3-S@C. The titanium sheets are used as a substrate, the iron chloride is used as an iron source, and the sodium sulfate is used as a precipitator. The thiourea or the thioacetamide is used as a vulcanizing agent. The method and the application have the advantages that the maximum capacity of original Fe2O3 electrodes in 1M KOH electrolyte is only 13.67 mAh / g, can be improved to reach 214.3 mAh / g after the Fe2O3 electrodes are vulcanized, and can reach 768.3 mAh / g after carbon coating optimization is carried out on the Fe2O3 electrodes; the capacity retention rate of the Fe2O3-S is only 7.95% after the Fe2O3-S is cycled by 100 times, and the capacity retention rate of the Fe2O3-S@C can reach 92.13%.

The invention relates to an electrolytic device and provides a device for preparing tetravalent uranium by electrolytic reduction to solve the problems of low tetravalent uranium yield of an existing diaphragm-free electrolysis device and complicated equipment, high cost and the like of a diaphragm electrolysis device. The device comprises an electrolytic tank body with an insulated inner wall, an anodic platinized and titanized rod and a cathodic titanium net, wherein the cathodic titanium net is barrel-shaped, the anodic platinized and titanized rod is arranged on the axial line of the barrel-shaped cathodic titanium net, and the surface area ratio of the cathodic titanium net to the anodic platinized and titanized rod is (10 to 1) to (20 to 1). The device for preparing tetravalent uranium by electrolytic reduction is simple in structure, high in tetravalent uranium yield and more convenient to operate and repair, overcomes the defect of low tetravalent uranium yield of the existing diaphragm-free electrolysis device and solves the problems of complicated equipment, high cost and the like of the diaphragm electrolysis device; the tetravalent uranium yield is more than 90% during a static electrolytic process.

The invention relates to an iron and nitrogen co-doped carbon oxygen reduction catalyst and its preparation method and application. A Fe / Zn bimetallic ZIF with element gradient distribution is prepared, and it is used as a precursor for pyrolysis and carbonization to prepare iron, Nitrogen co-doped carbon oxygen reduction catalyst to improve the utilization of active sites, optimize the pore structure, and then enhance the catalytic activity. The iron and nitrogen co-doped carbon oxygen reduction catalyst prepared by the invention can efficiently catalyze the oxygen reduction reaction, and exhibit better oxygen reduction catalytic activity and electrochemical stability than commercial Pt / C. The preparation method is simple and controllable, the cycle is short, and the raw material reserves are abundant, the cost is low, and large-scale production can be realized.

The method for reducing and dechlorinating chlorinated organic substances in water by surface-modified catalytic iron relates to the reductive dechlorination treatment technology for chlorinated organic pollutants in water bodies, and reduces the concentration of chlorinated organic pollutants Toxicity and pollution, suitable for the control of water pollution and the restoration of polluted water. The present invention first catalyzes the surface of the iron used for water treatment through electroless copper plating to improve the reducing ability of iron, and then uses a surfactant to modify the surface of the copper-plated iron to change the hydrophilicity and lipophilicity of the iron surface Features, increase the dissolution and adsorption of organic matter on the iron surface, improve the mass transfer conditions of organic matter transfer to the iron surface, and significantly increase the reaction rate. The method of the invention adopts simple equipment, convenient operation and management, and low cost. Except for the power consumption of the water pump, there is no other energy consumption. Therefore, the method of the invention is a method with low energy consumption and high efficiency, which is beneficial to popularization and application.

The invention discloses an electrode film and a preparation method thereof. The electrode film comprises a catalytic layer, a current collecting layer and a waterproof gas permeable layer, wherein thecatalytic layer, the current collecting layer and the waterproof gas permeable layer are superposed. The catalytic layer comprises a carbon carrier and a catalyst. The carbon carrier comprises an alkali-washed chemically active carbon and Vulcan XC72R carbon black. The mass ratio of chemically active carbon to Vulcan XC72R carbon black is (3 to 10):1. The catalyst is MnO2-Ag / C. The preparation method of the electrode film comprises the steps that catalytic layer preparation: the carbon carrier, a pore forming agent, the catalyst and a binder are added in a solvent, and a catalytic layer solution is acquired after ultrasonic dispersion; the catalyst layer solution is heated in a water bath to break the emulsion, and suction filtration is performed to acquire catalytic layer paste; the catalytic layer paste is rolled to acquire the catalytic layer; pressing: the acquired catalytic layer, the waterproof gas permeable layer and the current collecting layer are laminated to acquire an electrode film; and the electrode film is used in an aluminum-air battery to improve the rate of catalytic oxygen reduction reaction, so that the aluminum-air battery provides steady power.

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 relates to a sulfur conversion system regulated and controlled in situ for a municipal sewage pipeline and a running method of the sulfur conversion system. The system comprises a sewage well lid of the municipal sewage pipeline, a microbial electrochemical system and a lifting rack system, wherein the upper end of the lifting rack system is fixed on the sewage well lid while the lower end of the lifting rack system is connected to the microbial electrochemical system; the lifting rack system comprises an upper support, a retractable module, a lower support and a fixing object; the retractable module is fixed on the sewage well lid through the fixing object; the upper support and the lower support form an X; the upper end of the upper support and the upper end of the lower support are separately fixed on two sides of the retractable module; the lower end of the upper support is fixed on the lower support; the lower end of the lower support is connected with the microbial electrochemical system; the electrochemical system comprises a cathode group, an anode group, a wire and a retractable sleeve; the cathode group is connected with the anode group by the wire with the retractable sleeve in a sleeving manner; the retractable sleeve is connected with the lower end of the lower support; and the anode group is positioned at the bottom of the sewage pipeline. The system is simple in structure, good in sulfur conversion effect and pollution-free to the environment.

The invention relates to metal reduction equipment, in particular to internally-heating metal reduction equipment for magnesium, calcium and strontium, which solves the problems that the existing reduction equipment is externally-heating structure, the volume of the reduction pot is small, one-time capacity is little, discharging is not continuous, the labor intensity is large, the utilization ratio of the fuel is low, the yield is less and the like. The reduction equipment comprises a furnace body; a charging hopper is arranged above the furnace, a reduction bin is arranged in the furnace body; a vacuum extraction pipe is arranged above the reduction bin; an internally-heating pipe is arranged transversely by the reduction bin; the adjacent heating pipe has a gap for charging and reaction; two ends of the internally-heating pipe are respectively provided with a regenerative chamber; the regenerative chamber is internally filled with heat retainers which are communicated with a combustion-supporting air pipe and is internally inserted with a fuel core pipe which is connected with the fuel; an ignition hole is arranged by the heat retainers; and the middle section of the internally-heating pipe is a combustion chamber. The reduction equipment has simple structure, reasonable design, small construction area of the furnace body, low energy consumption, low production cost and high production efficiency and is applicable to large-scale mechanical production and has large promotion value.

The invention discloses a preparation method of molybdenum dioxide. The preparation method comprises the first step of mixing molybdenum trioxide and molybdenum powder thoroughly and grinding uniformly to obtain mixed powder; the second step of charging the mixed powder into a high temperature resistant boat of a reaction device, then vacuuming, then introducing inert gas to replace the gas in thereaction device and fill the reaction device; the third step of heating the mixed powder in the high temperature resistant boat for reaction, continuously introducing the inert gas and cooling afterthe heating reaction to obtain the molybdenum dioxide. According to the preparation method, the molybdenum trioxide and the molybdenum powder are thoroughly mixed and ground and then placed in the inert gas for reduction reaction to convert the molybdenum trioxide into the molybdenum dioxide, reduction with hydrogen is avoided, the safety of preparation of the molybdenum dioxide is improved, the preparation cost is reduced, the method is simple, the product purity is high, and the method is beneficial to popularization and application.

The invention discloses a method for microwave-assisted extraction of metal minerals. The method includes the first step of microwave-assisted treatment, the second step of cooling, the third step of ore grinding, the fourth step of separation and the fifth step of metal mineral extraction. The method is simple in step, low in input cost and convenient to achieve, the ore grinding workload is reduced, metal mineral extraction can be simply, conveniently and rapidly completed, efficiency is high, the needed reduction and leaching time is short, the reduction rate and the leaching rate of metal are high, energy conservation and environment friendliness are achieved, the using effect is good, and the problems that in a traditional extraction method, the input cost is large, the operation process is complex, energy consumption is large, the reduction and leaching time are long, and the environment is polluted can be effectively solved.