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201results about How to "Many steps" patented technology

Preparation method of transition metal oxide/carbon-based laminated composite material

InactiveCN104733712ALengthy process routeLong process routeHybrid capacitor electrodesCell electrodesNew energyConductive materials
The invention relates to a preparation method of a transition metal oxide / carbon-based laminated composite material. According to the preparation method, a conducting material such as metal carbide, metal nitride or metal carbonitride with a two-dimensional laminated structure is taken as a precursor, a gas containing oxygen elements is taken as an oxidant, and the two-dimensional conducting material is converted into the transition metal oxide / carbon-based laminated composite material by in-situ oxidation under the condition of controlling the oxidation temperature at 300-1000 DEG C and controlling the oxidation time at 1-300 min. The method disclosed by the invention has the advantages of simplicity and easiness in operation, controllable structure and morphology, controllable crystal form and electrochemical properties of metal oxides, and the like; the preparation method is environment-friendly, and nuisanceless, has no by-product, can be used for reducing the economic costs of traditional preparation methods, and can be popularized; and the transition metal oxide / carbon-based laminated composite material not only can be used as a key electrode material of a new energy storage device, but also can be used as a denitration catalyst, so that the material can be applied to the fields of environmental remediation, and the like.
Owner:EAST CHINA UNIV OF SCI & TECH +1

Method for separating and recovering vanadium and chromium from vanadium-chromium slag

ActiveCN104152704AImplement step-by-step extractionHigh yieldProcess efficiency improvementSlagMaterials science
The invention discloses a method for separating and recovering vanadium and chromium from vanadium-chromium slag. The method comprises the following steps: (1) carrying out first roasting on the vanadium-chromium slag and first sodium-containing materials and carrying out solid-liquid separation after leaching the product obtained after first roasting in water, thus obtaining first solid phases and a first liquid phase; (2) carrying out solid-liquid separation after carrying out vanadium precipitation on the first liquid phase, thus obtaining second solid phases and a second liquid phase; (3) carrying out secondary roasting on the first solid phases and second sodium-containing materials and carrying out solid-liquid separation after leaching the product obtained after secondary roasting in water, thus obtaining third solid phases and a third liquid phase; (4) carrying out solid-liquid separation after contacting the second liquid phase with the third liquid phase and carrying out precipitation, thus obtaining fourth solid phases and a fourth liquid phase; (5) calcining the second solid phases and the fourth solid phases and extracting vanadium; and (6) reducing the fourth liquid phase and precipitating chromium. By the method, vanadium and chromium can be simply separated and recovered from the vanadium-chromium slag at high yield.
Owner:PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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