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

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.

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.

Embodiments of the invention provide a positive electrode material and a lithium ion battery. The positive electrode material comprises a base material and a coating material formed on at least a partof the surface of the base material. The general formula of the base material is Li<x>Co<y>M<1-y>O<2>, wherein x is no less than 1.0 and no more than 1.2; y is no less than 0.8 and no more than 1.0;M is at least one selected from the group consisting of Mg, Ti, Al, Zr, Ni and Mn; and the coating material comprises Y<2>O<3> and at least two selected from the group consisting of La<2>O<3>, ZrO<2>and CeO<2>. Compared with positive electrode materials that do not contain coating materials or coating materials therein contain only one or two of the above oxides, the positive electrode material provided in the embodiments of the invention allows a battery core prepared from the positive electrode material to have a low storage expansion ratio and a high capacity retention rate through the co-action of at least three oxides and improves cycle performance at a high charging cut-off voltage.

The invention relates to a method for producing steel for high-efficiency alloy welding wires through continuous billet casting, belonging to the technical field of steel making. The method comprises the following processes: providing low-sulfur molten iron and scrap steel; smelting in a top / bottom blowing converter; pulling off slag and tapping; deoxidizing the ladle; alloying the molten steel; carrying out LF (Ladle Furnace) refining; carrying out RH (Ruhrstahl Heraeus) refining; carrying out fully-protected continuous casting by a continuous billet casting machine; and checking the cast billets, wherein the key processes comprise the end point control during converter smelting, the dose of deoxidizer, the control on the oxygen activity of the molten steel in the production process, thecontrol on the top slag during LF refining, the denitriding effect during RH refining, the regulation of sulfur and titanium contents in the refining process, the effect of protected casting and the like. The method is characterized by controlling oxygen and nitrogen contents in the molten steel through various process measures in the smelting process, thereby achieving the purpose of controllingthe reaction of titanium with oxygen and nitrogen, and reducing the possibilities that a submerged nozzle is blocked and crystallizer protecting slag is agglomerated. By using the method, the steel for high-efficiency alloy welding wires, of which the titanium content is 0.15-0.22%, can be stably produced.

A method for producing hydrogen and / or other gases from steel plant wastes and waste heat is disclosed. The method comprises the steps of providing molten waste from steel plant like molten slag in a reactor. The molten slag is contacted with water and / or steam in the presence of a reducing agent to form a stream of hydrogen and / or other gases. The hydrogen and / or other gases can then be extracted from the stream of gases from the reactor.

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 low-cost manufacturing method for non-quenched and tempered steel for a car, and belongs to the technical field of alloy steel production. The low-cost manufacturing method comprises the following steps: carrying out adaptive modification on an electric furnace, and shortening a smelting period within 45 minutes; carrying out full molten iron smelting, wherein charging amount of the molten iron is 90%-100%; controlling end point carbon content of molten steel to 0.10-0.30wt% and controlling oxygen activity in the molten steel to 0.010-0.020% by utilizing an eccentric bottom tapping mode of an electric furnace; reducing aluminum dosage to 0.35-0.70 kilogram / ton of molten steel; controlling oxygen activity in the molten steel to 0.0003-0.0005%; adding a calcium line into the molten steel, wherein the calcium dosage is 0.04-0.08 kilogram / ton of molten steel; and reducing oxygen content in non-quenched steel to be lower than 0.0020wt%. The low-cost manufacturing method has the advantages that the production cost is low, and using requirements of the non-quenched and tempered steel for the car are met.

The invention belongs to the technical field of steelmaking, and discloses a smelting method for controlling an existing form of boron in steel. The smelting method comprises the following steps of blowing oxygen and smelting: at the early stage of steel tapping, pure aluminum blocks are added along with the flow of steel for pre-deoxidation, and at the final stage of steel tapping, silicomanganese is added along with the flow of steel for final deoxidation; blowing at an argon station: soft blowing is performed for 15 to 20 min; adding silicon carbide for slag surface diffusion deoxidation at the early stage of LF refining; performing titanium micro alloying, and adding ferrotitanium for fixing nitrogen at the middle stage of LF refining; performing boron micro alloying, and adding ferroboron at the final stage of LF refining; performing LF soft blowing for 30 to 40 min; performing continuous casting: casting is protected by adopting a long nozzle and a submersed nozzle. The invention provides the smelting method for increasing the duty cycle of solid solution boron.

The invention relates to a method for treating solid waste through a rotary hearth furnace and belongs to the technical field of steel mill solid waste treatment. The problems that in the prior art, recycled zinc oxide powder is low in grade, and finished metallized pellets are high in pulverization rate are solved. The method for treating the solid waste through the rotary hearth furnace comprises the following steps of pelletizing, reduction and zinc-contained powder recycling, and a drying stage is further performed between the pelletizing and the reduction. The method for treating the solid waste through the rotary hearth furnace provided by the invention can be used for treating solid materials generated in the production processes of sintering, ironmaking and steelmaking.

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 examples of the present application provide a positive electrode material and a lithium-ion battery. The positive electrode material comprises: a substrate material; and a coating material formed on at least one part of a surface of the substrate material; the general formula of the substrate material being LixCoyM1-yO2, wherein 1.0≤x≤1.2, 0.8≤y≤1.0 and M is at least one selected from the group consisting of Mg, Ti, Al, Zr, Ni, Mn; the coating material includes Y2O3 and at least two selected from the group consisting of La2O3, ZrO2 and CeO2. The examples of the present application enable the battery prepared by the provided positive electrode material to have a lower storage expansion ratio, a higher capacity retention ratio, and improved cycle performance at a high charge cutoff voltage by the interaction of at least three kinds of oxides.

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.