40results about How to "Control chemical composition" patented technology

The invention relates to a method for synthesizing LiFePO4 / C material by chemical vapor deposition supporting the solid phase reaction method, namely, the method for preparing carbon coating lithium iron battery anode material, belonging to the Li-ion battery material preparation art technical field. The characteristics of the method for synthesizing LiFePO4 / C materials by solid phase and auxiliary chemical vapor deposition are that auxiliary chemical vapor deposition supporting the solid phase reaction method is adopted to synthesize the carbon coating phosphate lithium iron, namely, the LiFePO4 / C material. In the method for synthesizing LiFePO4 / C material by chemical vapor deposition supporting the solid phase reaction method, a precursor comprising raw materials of lithium, iron and phosphor is adopted to prepare the carbon coating phosphate lithium iron after being blended, grinded by a globe mill, treated by preheating and calcined as well as vapor deposition. The method for synthesizing LiFePO4 / C material by chemical vapor deposition supporting the solid phase reaction method has the advantages that the chemical composition, carbon contents and grain size of LiFePO4 can be controlled effectively; the Li-ion battery anode material prepared has sound conductive performance and can improve the charge-discharge rate and cycling performance of the material.

The invention provides a method for preparing reconstituted tobacco leaves. The preparation method comprises the following steps: extracting tobacco raw materials to obtain extracts and solid slag, passing the tobacco extract through a decanter centrifuge and a disc separator, and then passing Activated carbon adsorption device A and activated carbon adsorption device B obtain the concentrated liquid of tobacco refining liquid B, and then obtain the finished reconstituted tobacco leaves after concentration, beating, coating, drying and cutting. The present invention utilizes the adsorption of different activated carbons, adopts coal-based columnar activated carbon to absorb part of the protein, pectin and other macromolecular substances in the tobacco extract, and adopts coconut shell granular activated carbon to absorb part of the nicotine and total nitrogen in the tobacco extract. , total sugar and other components, so as to achieve the purpose of regulating the chemical components of reconstituted tobacco leaves and improve the quality of reconstituted tobacco leaves.

The invention discloses a method for preparing a lignin-based high specific surface area carbon material. The method comprises the following steps: by taking lignin as a carbon material precursor, preparing a solution from the lignin, performing freeze-drying so as to obtain lignin aerogel, carbonizing the lignin aerogel in a tubular furnace in an argon atmosphere, and cooling, thereby obtaining the lignin-based high specific surface area carbon material. Through freeze-drying and high-temperature carbonization, the carbon aerogel material of a high specific surface area and low density is prepared, the activation process is avoided, and compared with a conventional preparation method of carbonization and activation later, the method has the advantages that the energy consumption is effectively reduced and the environment pollution is avoided.

The invention provides a method for preparing high-nitrogen steel from micro-carbon ferrochrome. First, micro-carbon ferrochrome powder is subjected to nitrogen addition, high-nitrogen ferrochrome intermediates are prepared, and then the high-nitrogen ferrochrome intermediates are employed to prepare high-nitrogen steel. In the method, micro-carbon ferrochrome powder is employed to prepare high-nitrogen ferrochrome intermediates self, the quality is good, the material quality is controllable, which is helpful for smooth and steady smelting of high-nitrogen alloy and high-nitrogen steel melt, chemical components of high-nitrogen steel can be controlled effectively, and high-quality high-nitrogen steel bases and castings can be obtained. Micro-carbon ferrochrome powder is employed as a main raw material for preparing high-nitrogen steel, the source is wide, the quality is reliable, the preparation cost of high-nitrogen steel bases and castings can be lowered when the method is compared with a method employing nitride ferrochrome and high-nitrogen ferrochrome raw materials directly.

The invention discloses a flux-cored wire used for super duplex stainless steel gas shielded welding and a preparation method thereof. The flux-cored wire is composed of an external use steel belt andflux powder, wherein the external use steel belt is made of an austenitic stainless steel belt with 17.0%-18.0% of chromium and 11.0%-12.5% of nickel; and the flux powder comprises the following components of, in percentage by weight, 36.0%-38.0% of chromium powder, 9.0%-13.0% of high-nitrogen chromium iron, 2.5%-3.0% of electrolytic manganese metal, 4.0%-5.0% of molybdenum powder, 0.5%-1.0% of ferrosilicon, 1.0%-1.5% of ferrotitanium, 0.5%-1.0% of aluminum-magnesium alloy, 18.0%-20.0% of rutile, 1.0%-2.0% of quartz, 5.0%-6.0% of zircon sand, 1.0%-1.5% of potassium feldspar, 3.0%-3.5% of albite, 1.0%-1.5% of fluorite, 0.5%-1.0% of sodium cryolite, 1.0%-1.5% of potassium titanate, 0.1%-0.3% of bismuth oxide and the balance iron powder. According to the flux-cored wire used for super duplexstainless steel gas shielded welding and the preparation method thereof, the components and the two-phase proportion of deposited metal can be balanced, thus obtaining a duplex stainless steel welding joint which is good in forming quality and excellent in corrosion resistance.

The invention provides a method for preparing high-nitrogen steel from chromium concentrate powder. In the method, chromium concentrate is employed to replace carbon reduced chrome oxide as a main raw material for preparing intermediates of high-nitrogen steel and preparing high-nitrogen steel directly. The raw material source is wide and reliable, the operation of calcination of carbon-reduced chrome oxide by utilization of high-carbon ferrochrome is omitted, the production cost is lowered, the production efficiency is raised, smoke pollution is reduced, a low carbon content and a high and controllable nitrogen content can be ensured, melting of high-nitrogen steel with different component requirement can be controlled to ensure a low carbon content and a high and controllable nitrogen content, and high-quality high-nitrogen steel bases and castings can be obtained.