8 results about "Tube furnace" patented technology

The invention relates to a lithium silicate-coated Ni-Co lithium aluminate positive electrode material and a preparation method thereof. The mass percent of lithium silicate in the material accounts for 1-10wt%, a coating layer with a thickness being 2-20 nanometers is formed from the silicon silicate and is coated on Ni-Co lithium aluminate, and the positive electrode material is a spherical particle with a grain size being 5-15 micrometers. The method comprises the following steps of (1) adding a silicon source into an organic solvent, performing uniform stirring, adding water, adding Co-Alnickel hydroxide, performing heating and stirring reaction, and performing drying to obtain silicon dioxide-coated Co-Al nickel hydroxide precursor powder; and (2) grinding and uniformly mixing the silicon dioxide-coated Co-Al nickel hydroxide precursor powder and a lithium salt, placing the mixture in a tubular furnace, and performing two-segment calcination under an oxidization atmosphere, thereby obtaining the lithium silicate-coated Ni-Co lithium aluminate positive electrode material. The positive electrode has relatively good cycle stability and large-rate discharging performance; and bythe method, the problem of lithium resided on a surface during conventional coating can be effectively reduced, and the method is low in cost and simple in process and is suitable for industrial production.

The invention discloses an in-situ preparation method of carbon nano-sheet-coated nano-silicon composite material, and belongs to the technical field of nano material preparation. The method comprisesthe steps of: mixing magnesium powder, nano-silicon dioxide and inorganic salt according to a predetermined ratio, and then pressing the mixture into a sheet shape by a dry pressing forming process,then calcining the sheet material in a tube furnace with high temperature under a carbon dioxide atmosphere, carrying out a primary pickling and a secondary pickling respectively in a hydrochloric acid solution and a hydrofluoric acid solution after the calcination is completed, centrifugally washing the product to be neutral, and finally carrying out a vacuum drying to obtain a carbon nano-sheet-coated nano-silicon composite material. The in-situ preparation method provided by the invention is simple in operation and mild in conditions, and the preparation of the carbon nano-sheet-coated nano-silicon composite material is realized by a simple device at a relatively low temperature, which is safe and environmentally friendly, thereby effectively reducing the preparation cost of the carbon-modified nano-silicon composite material.

The invention discloses a preparation method of a positive electrode catalyst Mn2O3 of a lithium carbon dioxide battery. The method comprises the following steps of dissolving PVP into absolute ethylalcohol and then adding Mn(CH3COO)2.4H2O; carrying out magnetic stirring and reflux reaction at 40-80 DEG C to obtain a white precipitation product and carrying out vacuum drying to obtain a powdery precursor; and carrying out heat preservation in a tube furnace at 500-700 DEG C for 2-4h to obtain the positive electrode catalyst Mn2O3 of the lithium carbon dioxide battery. The positive electrode catalyst Mn2O3 of the lithium carbon dioxide battery is used for preparing a positive electrode of the lithium carbon dioxide battery. The materials are easy to obtain, and the method is simple in preparation process and technology, low in cost and friendly to environment.

The invention discloses a bifunctional adsorbent of N-TiO2 silkworm-excrement porous carbon and a preparation method of the bifunctional adsorbent of the N-TiO2 silkworm-excrement porous carbon. The preparation method comprises the following steps: (1) firstly mixing and putting silkworm excrement and ZnCl2 in a high-temperature tube furnace, introducing a protective gas to purge, then heating to 300 to 700 DEG C to obtain silkworm-excrement porous carbon (SPC) through reaction; (2) adding butyl titanate to a selective alcohol solvent, drop by drop adding to an aqueous suspension containing the silkworm-excrement porous carbon, enabling the butyl titanate hydrolyzed to generate amorphous TiO2, thus obtaining an A-TiO2/silkworm-excrement porous carbon material; (3) carrying out surface modification on the material through a plasma radiation way to obtain an N doped A-TiO2 silkworm-excrement porous carbon material; (4) calcining the material at the temperature of 180 to 500 DEG C, finally obtaining an N-TiO2/SPC bifunctional adsorption material. The bifunctional adsorption material disclosed by the invention is applied to synchronous adsorption and catalytic degradation of VOCs of aldehydes and benzene series.

The invention provides a preparation method of zeolite-activated carbon composite adsorbent, comprising the following steps: (1) mixing coal gangue powder, asphalt, and white carbon black, drying, and then, in a tube furnace, under the protection of inert gas, Carbonization, and then carbon dioxide gas is introduced to activate to obtain the activated sample; (2) Add the activated sample to the sodium hydroxide solution, react, stand at room temperature for hydrothermal crystallization, then ultrasonically disperse, filter, and filter the residue Washing and drying to obtain the zeolite-activated carbon composite material; (3) Add the obtained zeolite-activated carbon composite material to the glucose solution, stir, filter, dry the obtained filter residue, and then put it into a tube furnace under the protection of an inert gas , carbonized to obtain the zeolite-activated carbon composite adsorbent. The zeolite-activated carbon composite adsorbent prepared by the invention has large BET specific surface area and micropore specific surface area, and has large adsorption capacity for CH4 and N2.

The invention discloses an ammonia-water absorption type refrigerator driven by oilfield waste heat and used for recycling light hydrocarbon. The absorption type refrigerator is composed of a conduction oil generator, a rectifying tower, a condenser, a liquid ammonia tank, a subcooler, a liquid filling bubbling absorber, a solution heat exchanger, a fire tube furnace flue gas finned tube recoverer, a heating medium furnace flue gas finned tube recoverer, a concentrated solution tank, a solution pump, an electric control cabinet, an electric regulating valve and a temperature sensor. The ammonia-water absorption type refrigerator has the characteristics that exhaust flue gas waste heat of a heating medium furnace and a fire tube furnace in an oilfield light hydrocarbon recycling technical process is fully recycled, and the recycled waste heat is used for driving a unit to perform refrigeration for replacing a traditional compression type refrigerator in the oilfield light hydrocarbon recycling technical process, and thus the electric power consumption for recycling the oilfield light hydrocarbon is reduced while the exhaust flue gas temperature of the heating medium furnace and the fire tube furnace is decreased and air environmental pollution is reduced. The binding equilibrium of cold and heat in an oilfield light hydrocarbon recycling technique is achieved, and the unit has multiple advantages that the operation is reliable, easy and convenient, and the electricity consumption is reduced by 90% compared with the traditional compression refrigerator.

The invention provides a preparation method of a high-performance calcium manganate energy storage electrode material. According to the method, with a calcium source and a manganese source used as precursors, and deionized water and absolute ethyl alcohol used as solvents, a calcium manganate nano material can be synthesized through a hydrothermal reaction; the calcium manganate nano material is subjected to centrifuging, cleaning and drying treatment; the calcium manganate nano material synthesized through the hydrothermal reaction is put into a tubular furnace, and annealing treatment is performed for 30-180 minutes at 100-900 DEG C in an ammonia atmosphere, so that the high-performance calcium manganate nano material can be obtained. The preparation method is simple to operate, wide inraw material source, low in cost, safe, non-toxic, environment-friendly and extremely easy for large-scale production. After the annealing treatment, the shape of the sample is changed, the conductivity of the sample is improved, the specific surface area of the sample is increased, and the active sites of the sample are increased; and therefore, the capacitance performance and rate capability ofcalcium manganate are effectively improved, and the calcium manganate can have a very wide application prospect in the aspect of energy storage.