31results about How to "Reduce oxygen activity" patented technology

In solid oxygen ion conducting electrolytes for electrochemical cells based on magnesium oxide and calcium oxide, obtained by the addition of metal fluorides selected from elements in the groups of alkali metals and earth alkali metals to the host oxides of magnesium and calcium, conductivity values are obtained, which are comparable with those of stabilized zirconia, but the magnesium oxide and calcium oxide based oxygen ion conducting electrolytes have a superior thermodynamic stability and, therefore, can operate at much lower oxygen concentrations in comparison with other oxygen ion conducting electrolytes and without becoming noticeably electronically conductive.

Method for processing an article comprising mixed conducting metal oxide material. The method comprises contacting the article with an oxygen-containing gas and either reducing the temperature of the oxygen-containing gas during a cooling period or increasing the temperature of the oxygen-containing gas during a heating period; during the cooling period, reducing the oxygen activity in the oxygen-containing gas during at least a portion of the cooling period and increasing the rate at which the temperature of the oxygen-containing gas is reduced during at least a portion of the cooling period; and during the heating period, increasing the oxygen activity in the oxygen-containing gas during at least a portion of the heating period and decreasing the rate at which the temperature of the oxygen-containing gas is increased during at least a portion of the heating period.

The invention provides a method for producing boron steel in a converter, which is characterized in that argon subaeration is performed on a ladle in the whole process; a deoxidizer and alloys required by steel grades are begun to be added into the ladle for preliminary deoxidation and alloying under the condition of 1/4 tapping, and simultaneously a desulfurizer is added for desulfurization treatment; aluminum is added into the ladle in an argon blowing station for final deoxidation, and ferroboron is added into the ladle when the [O] is controlled to be between 0.0020 and 0.0040 percent; and the ferroboron is coated by an aluminum sheet and added into molten steel. The method has the advantages that: firstly, the method saves the refining procedure of an LF furnace and a vacuum furnace and has low production cost, short production procedure and high production efficiency; secondly, the pourability of the molten steel is good; thirdly, no requirement is put forward as for acid-soluble aluminum in the steel, so that the method solves the problems of pastiness of the molten steel, easy bonding of water gaps, reduction of the steel quality and the like caused by the increase of Al2O3 inclusion due to high acid-soluble aluminum; and fourthly, the recovery rate of boron can reach 60 to 75 percent and the wave range of the yield is small. Moreover, the method has good application prospect.

The invention relates to a low-alkalinity synthetic slag for external refining of boiler tube steel, wherein CaO, Al2O3, MgO, SiO2 and CaF2 are used as basic components in the synthetic slag; the alkalinity range of the synthetic slag is controlled; and the synthetic slag comprises the following specific chemical compositions in percentage by weight: 48-55% of CaO, 18-25% of Al2O3, 6-8% of MgO, 14-18% of SiO2, 25% of CaF and smaller than 1% of MnO and FeO, wherein the alkalinity of the synthetic slag is 3-3.5. Compared with the traditional synthetic slag for external refining of boiler tube steel, the oxidbillity of refining slag is strictly controlled so that the content of MnO and FeO is smaller than 1%; the oxygen activity of liquid steel balanced with the synthetic slag is promoted to be decreased; and the total oxygen in the steel can be controlled between 12ppm and 15ppm. The alkalinity of the synthetic slag is kept between 3 and 3.5; and the refining slag keeps good melting, flowing, adsorption and desorption abilities of slag inclusion while having good deoxidating and desulphurizing abilities.

The invention discloses an improved blast furnace soft water closed circulation system and method. The system comprises a host controller, a cooling wall cooling unit, an expansion and degasification unit, a secondary circulation water unit and a primary circulation water supply unit. According to the improved blast furnace soft water closed circulation system and method, multiple water supply main pipes are adopted, the redundancy degree of the system is increased, and blast furnace production safety is guaranteed; a cooling wall is zoned, grading and leakage detecting are facilitated, the time needed for leakage detecting is reduced, and guarantees are provided for stable production and cost reduction; and secondary circulation water setting is reasonable, the work pressure of secondary circulation water cooling equipment is reduced, the risk of water leakage is reduced, and the gas contents in primary circulation water and secondary circulation water are reduced.

Method for processing an article comprising a mixed conducting metal oxide material, which method comprises (a) contacting the article with an oxygen-containing gas and reducing or increasing the temperature of the oxygen-containing gas; (b) when the temperature of the oxygen-containing gas is reduced, reducing the oxygen activity in the oxygen-containing gas; and (c) when the temperature of the oxygen-containing gas is increased, increasing the oxygen activity in the oxygen-containing gas.

In a method for removing a substance from a feedstock comprising a solid metal or a solid metal compound, the feedstock is contacted with a fused-salt melt. The fused-salt melt contains a fused salt, a reactive-metal compound, and a reactive metal. The fused salt comprises an anion species which is different from the substance, the reactive-metal compound comprises the reactive metal and the substance, and the reactive metal is capable of reaction to remove at least some of the substance from the feedstock. A cathode and an anode contact the melt, and the feedstock contacts the cathode. An electrical current is applied between the cathode and the anode such that at least a portion of the substance is removed from the feedstock. During the application of the current, a quantity of the reactive metal in the melt is maintained sufficient to prevent oxidation of the anion species of the fused salt at the anode. The method may advantageously be usable for removing the substance from successive batches of the feedstock, where the applied current is controlled such that the fused-salt melt after processing a batch contains the quantity of the reactive metal sufficient to prevent oxidation of the anion species at the anode.

The invention discloses a method for synergistically and deeply removing oxygen in metal hafnium by super-oxyphilic metal and calcium. The method comprises the following steps: filling specific positions of a reactor with materials such as super-oxyphilic metal, anhydrous calcium chloride, a hafnium raw material and a calcium reducing agent; and carrying out distillation-deoxidation and disassembly-cleaning so as to stably reduce the oxygen content of hafnium to be smaller than 100 ppm. The super-oxyphilic metal has extremely high oxygen affinity, and oxygen in calcium chloride fused salt canbe subjected to solid solution or forms oxide, so that extremely low oxygen potential is created, and the thermodynamic problem of deep deoxidation is solved; and the calcium chloride fused salt has high fluidity and high solubility to the calcium reducing agent and calcium oxide, so that the kinetics problem of deoxidation is solved. Through organic combination of purification and deoxidation ofCa, deep, efficient and stable removal of oxygen in the metal hafnium is realized. The method disclosed by the invention is simple and easy to implement, good in oxygen removal effect and free of secondary pollution, and the product meets the use requirements in the fields of target material manufacturing, optical coating, electronic element manufacturing and the like.

The invention discloses a slow-release deoxidation method for aluminum-containing steel and its application. The method includes converter smelting and refining processes; in the converter smelting process, calcium carbide is added to a ladle before and during tapping. The invention also discloses the application of the aluminum-containing steel slow-release deoxidation method in steelmaking. The present invention adopts the method of slow-release deoxidation of aluminum-containing steel, adding calcium carbide to the ladle before tapping, adding calcium carbide along with the steel flow during the tapping process, and utilizing the weak reducing property of the calcium carbide to slowly release and remove the steel during the entire tapping process. Oxygen in water can reduce the oxygen activity of molten steel to increase the yield of aluminum products, reduce the consumption of aluminum products, calcium alloy wire and other materials, and reduce the number of Al2O3 inclusions in molten steel. The deoxidation product of calcium carbide, CO, enhances the stirring ability of the molten steel during the discharge process, and plays a role in uniforming the composition of the molten steel. The invention has a stable production process, reduces production costs, and is suitable for smelting aluminum-containing steel with a silicon content of ≤0.1% and aluminum-containing steel with a carbon content of ≥0.1%.

The invention discloses a positive electrode material and a preparation method and application thereof. The positive electrode material comprises a single-crystal positive electrode material inner core and a CoxB layer located on the surface of the single-crystal positive electrode material inner core. According to the invention, the surface of the single-crystal positive electrode material is coated with the CoxB layer, so the oxygen activity of the surface/interface is reduced, side reactions are reduced, and the conductivity and the cycle performance of the material are improved. The introduction of the CoxB layer has a particularly remarkable improvement effect on the quaternary positive electrode material, and the conductivity and the cycling stability can be greatly improved under the original conditions of high capacity and low gas production, so the electrochemical performance of the positive electrode material is improved.

The invention relates to the technical field of steel smelting, and particularly discloses an automobile vanadium-titanium-containing steel alloying smelting method. The method at least comprises thefollowing steps that part of vanadium-titanium-containing molten iron is poured into a steel ladle filled with a desulfurizing agent and a dephosphorizing agent; the rest vanadium-titanium-containingmolten iron continues being smelted by a converter to obtain finishing molten steel, the molten steel is subjected to tapping and poured into the steel ladle to be mixed with the vanadium-titanium-containing molten iron, mixed molten steel is obtained, and in addition, in the finishing molten steel tapping process, the steel ladle is subjected to bottom blowing CO and N2 mixed gas stirring; and the mixed molten steel is refined through an LF, and molten steel of vanadium-titanium-containing steel is obtained. According to the method, through the smelting method that the vanadium-titanium-containing steel for an automobile is directly alloyed, the vanadium-titanium-containing molten iron is maxed with the molten steel smelted by the converter, the effect that the automobile vanadium-titanium-containing steel is subjected to vanadium and titanium alloying through the element vanadium and the element titanium in the vanadium-titanium-containing molten iron is achieved, and the automobilevanadium-titanium-containing steel alloying cost can be remarkably reduced.

The invention belongs to the technical field of steel and iron smelting, and relates to a deformed steel bar converter slag washing desulfurization method. The deformed steel bar converter slag washing desulfurization method comprises the following steps: adding a top slag modifier into a steel ladle in a converter tapping process to control the components of steel ladle top slag, deoxidizing molten steel at first to reduce the oxygen activity in the molten steel, and then increasing the O<2-> ion concentration in the steel ladle top slag to desulfurize the molten steel; and stirring the steel ladle top slag and the molten steel by means of kinetic energy of the molten steel in the tapping process, and meanwhile, blowing argon or nitrogen into the steel ladle for stirring to accelerate a reaction between the steel and the slag. The deformed steel bar converter slag washing desulfurization method is optimized on the basis of an original technology, no equipment or facilities are added, original conditions are fully utilized, and implementation is easy; and meanwhile, a desulfurization material utilization rate is high, and the usage amount is reduced, so that the cost is reduced.