33results about How to "Guaranteed nitrogen content" patented technology

The invention provides a preparation method of activated carbon with capability of efficiently adsorbing CO2. The preparation method comprises the following steps: adding p-aminophenol after reaction of melamine and formaldehyde, carrying out reflux reaction for 4-8h, cooling until room temperature, then adding a methanol solution of F127 or P123, respectively segmenting at temperatures of 100-120 DEG C, 130-160 DEG C, 170-190 DEG C, 210-230 DEG C and 240-260 DEG C, respectively curing to obtain nitrogen-containing prepolymer, then carbonizing, mixing a carbonized material and KOH, activating for 0.5-2.0h, repeatedly washing by deionized water until neutrality finally, and drying to obtain the product. The activated carbon has the advantages of high specific surface area, high nitrogen content and high CO2 adsorption performance.

The invention discloses a urea sulfate coated urea slow-release granular fertilizer. The urea sulfate coated urea slow-release granular fertilizer is prepared through the following steps of: adding 100kg of urea granules of which the diameters are 2-4.5mm to a rotary drum type coating machine, preheating the urea granules to 40-45 DEG C, spraying 1-10kg of a binder namely urea sulfate, uniformly mixing the preheated urea granules and the urea sulfate so as to obtain a mixture, spraying 1-20kg of metasilicate powder, cooling the mixture and the metasilicate powder, spraying 1-10kg of mounting addition agents (a mixture of solid paraffin and liquid paraffin) of which the temperature is 50-60 DEG C, cooling the mixture, the metasilicate powder and the mounting addition agents to a room temperature, and repeating the coating operation 2-3 times. The binder namely the urea sulfate is prepared through the steps of slowly adding1-2kg of concentrated sulfuric acid of 90-98wt% to every 1-10kg of urea and performing a reaction in a reaction tank. The urea sulfate coated urea slow-release granular fertilizer disclosed by the invention adopts a urea sulfate metasilicate slow-release film, tests prove that the urea sulfate metasilicate slow release film has a favorable slow-release effect, and in the slow-release process, the slow-release film is not liable to collapse and is easy to degrade. The urea sulfate has subacidity, so that the application range of the urea sulfate is wider than that of sulfur coating urea. The urea sulfate coating film realizes double-film double-control effects, and has the advantages of high efficiency, environmental protection, low cost and the like.

One aspect of the present invention provides a consumable electrode for pressurized electroslag remelting high-nitrogen steel, which includes a base material of the consumable electrode and at least two cored tubes embedded in the base material of the consumable electrode; the cored tube includes The iron pipe and the nitride alloy filled in the iron pipe, the first end of the cored pipe is located at the end where the consumable electrode base material is inserted into the slag pool, and the second end of the cored tube is located at the end where the consumable electrode base material is away from the slag pool one end. It avoids the leakage of nitrided alloy in the process of electroslag remelting, and improves the composition distribution from the core to the edge of the remelted steel ingot. Another aspect of the present invention provides a method for preparing a consumable electrode for pressurized electroslag remelting high-nitrogen steel, which avoids the oxygenation of molten steel caused by welding, and has a simple preparation process and low cost.

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 belongs to the field of alloys, in particular to a nitrogen-containing high-entropy alloy composite material and a preparation method thereof. The nitrogen-containing high-entropy alloy composite material has a mixed crystal structure in which one layer of coarse grains and one layer of fine grains are alternately distributed. The preparation method includes: step 1, preparing nitrogen-containing high-entropy pre-alloyed powder; in the nitrogen-containing high-entropy pre-alloyed powder, metal elements are selected from at least three of Fe, Co, Cr, Ni, and Mn; In step 2, the nitrogen-containing high-entropy pre-alloyed powder obtained in step 1 is formed by using a selective laser melting technology; and a nitrogen-containing high-entropy alloy is obtained. The preparation process of the present invention is simple and controllable; the structure of the product is fine and uniform, the nitrogen element distribution inside the blank is uniform, the overall nitrogen element distribution is also relatively uniform, the mechanical properties are good, and the corrosion resistance is good; this is to realize the nitrogen-containing high-entropy alloy. Engineering applications provide the necessary conditions.

The invention discloses a method for preparing vanadium nitride, which comprises the following steps: step 1, carrying out pre-reduction on a test specimen prepared from ammonium metavanadate powder and carbon powder in a heating furnace by nitrogen, wherein in the pre-reduction process, a temperature in the heating furnace is 650 to 670 DEG C, nitrogen flow is 210 to 270mL / min, and heat preservation time of the heating furnace is 2 to 4 hours; step 2, after ending heat preservation in the step S1, warming the heating furnace to a temperature of 1,300 to 1,500 DEG C and carrying out final reduction on the test specimen, wherein the final reduction process, nitrogen flow in the heating furnace is 210 to 270mL / min, and heat preservation time of the heating furnace is 4 to 5 hours; step 3, after ending heat preservation in the step S2, carrying out furnace cooling on the test specimen in nitrogen atmosphere, so that the obtained test specimen is the vanadium nitride. According to the method disclosed by the invention, the vanadium nitride is prepared by the ammonium metavanadate, so that a calcination section can be omitted, and the aims of simplifying a production process, reducing production cost of an enterprise and reducing pollution are fulfilled.