15results about How to "Reduce the amount added" patented technology

This invention discloses a method for controlling sulfides in sulfur-containing gear steel, belonging to the field of metallurgical technology, including converter, LF refining, RH refining, and continuous casting processes. Converter process: molten steel tapping temperature 1630±20℃, carbon-oxygen product controlled below 0.0020; LF refining process: aluminum content in molten steel controlled at 0.035-0.045%, LF slag composition adjusted to R: 1.5-2.5, FeO+MnO: 1.0-2.0%; RH refining process: ferrotitanium added in one step to adjust the composition appropriately; Continuous casting process: argon-blown stopper rods and submerged entry nozzles are used for continuous casting, and 150-200 kg of low-basicity tundish covering agent is added to the tundish. The sulfur-containing gear steel produced by this invention can be continuously drawn for more than 10 heats, and the level of Class A inclusions can be stably controlled at A coarse ≤ 1.0 grade and A fine ≤ 1.5 grade, with a pass rate of over 99.9%.

The application relates to the technical field of rubber materials, and discloses fluorine rubber for high-temperature oxygen sensors and a processing technology thereof. The processing technology comprises the following steps: S1: fluorinated modified methyl vinyl silicone rubber is prepared from methyl vinyl silicone rubber and 1H, 1H, 2H, 2H-perfluorodecanethiol; S2: glycerol modified silicone rubber is prepared from methyl vinyl silicone rubber and 1-thioglycerol; the glycerol modified silicone rubber is taken, mixed uniformly in a mixed solvent of tetrahydrofuran and water, urea is added, phosphoric acid is added dropwise under heating, and the mixture is kept for reaction, the solvent is removed, and the mixture is dried to obtain phosphoric acid ester modified methyl vinyl silicone rubber; S3: the fluorine rubber after being broken, the fluorinated modified methyl vinyl silicone rubber and the phosphoric acid ester modified methyl vinyl silicone rubber are added into an open mill and mixed uniformly, a composite filler and magnesium oxide are added, mixing is carried out, a vulcanizing agent and a crosslinking aid are added, mixing is carried out uniformly, and vulcanization is carried out to obtain the fluorine rubber for high-temperature oxygen sensors.

The invention provides an intelligent control method for heat balance in the aluminum alloying process. The intelligent control method comprises the steps that S1, the target aluminum content of molten steel in an RH refining device, the total mass of the molten steel and the specific heat capacity of the molten steel are obtained; s2, according to the actual production state and the production steel type, the oxygen value of the molten steel before alloying and the refining entering temperature are collected according to the time sequence, and the aluminum yield is calculated; s3, based on the aluminum yield, heat balance operation judgment conditions are set, and if yes, calculation is conducted according to an empirical formula; if yes, executing the step S4; s4, calculating the heat effect of the aluminum dissolving process, the heat effect of the aluminum melting process and the heat effect of the aluminum-oxygen reaction; s5, calculating the total heat effect; s6, the temperature change value of the molten steel system in the alloying process is calculated; and S7, according to the difference value between the temperature change value of the molten steel system in the alloying process and the target refining final temperature, a compensation heating or cooling instruction is output, the actual final temperature is made to be consistent with the target value, the instruction is automatically executed to complete aluminum alloy affiliation, and the temperature-controlled molten steel with the aluminum content reaching the standard is obtained.

This invention discloses a method for controlling the nitrogen content of molten steel in a converter with low iron consumption mode, belonging to the field of steel manufacturing technology. The method includes the following steps: controlling the molten iron inlet temperature to 1310-1330℃, controlling the silicon content in the molten iron to 0.30%-0.50%, controlling the molten iron charging ratio to 65-70%, and the scrap steel charging ratio to 30-35%; controlling the converter iron-to-steel ratio to 720-750 kg / t; after adding scrap steel into the furnace, shaking the furnace back and forth until the furnace mouth flame is normal, and baking the scrap steel; adding 50% of the slag in the first 4 minutes of the converter blowing process, and then adding the remaining slag in small amounts multiple times over 4-8 minutes, controlling the furnace temperature, and stirring the molten pool back and forth from high to low with an oxygen lance before the end point; using nitrogen-argon switching bottom blowing during the converter blowing process; adding ladle slag modifier before tapping, and then adding deoxidizer for alloying, while simultaneously performing ladle bottom blowing with argon. The control method of the present invention can control the nitrogen content of converter steel to within 40 ppm under the condition that the iron-to-steel ratio in the converter is as low as 720-750 kg / t.

The invention discloses a low-cost H340-grade high-strength steel rail smelting method based on rare earth treatment and cooperative control under continuous casting soft reduction, which comprises the following steps: 1) optimization of mass percent component design: on the basis of a low-vanadium high-manganese component system, introducing rare earth elements to form a Mn / V / RE multi-element cooperative strengthening mechanism; (2) controlling a continuous casting process; 3) adding and treating rare earth; and (4) other key procedures are accurately regulated and controlled. The invention aims to provide the low-cost H340-grade high-strength steel rail smelting method based on rare earth treatment and cooperative control under continuous casting soft reduction, and unification of high strength, high toughness and low cost of the steel rail is realized by optimizing a component system (introducing rare earth) and cooperatively and accurately regulating and controlling a continuous casting process.

A preparation method of a new type of environment-friendly natural latex product. The method comprises the following steps: S1, preparation of a sodium salt solution of shellac resin; S2, adding potassium pyrophosphate, potassium oleate, potassium ricinoleate and sulfur dispersion into natural latex, and stirring and aging to obtain a mixture A; S3, adding calcium salt aggregates of shellac resin and a rubber deodorant into the mixture A, stirring uniformly, immediately transferring the mixed glue liquid into a foaming machine to perform foaming, injecting zinc oxide dispersion and sodium fluosilicate dispersion during the foaming process, and injecting the foamed latex mixture into a pillow mold to enter a steaming oven for vulcanization; and S4, washing and vacuum drying the semi-finished product of the latex product, and completing the production. The method is convenient to process and reliable in environmental protection.

This invention discloses a low-cost rare earth weathering steel and its production process. The chemical composition and mass percentage of the weathering steel are as follows: C 0.06%~0.12%, Si 0.25%~0.50%, Mn 0.60%~1.00%, P 0.07%~0.12%, S≤0.005%, Cu 0.15%~0.40%, Cr 0.30%~0.50%, Ce 0.002%~0.015%, Alt 0.020%~0.050%, Ti 0.02%~0.08%, N≤0.006%, with the balance being Fe and unavoidable impurities. This weathering steel uses rare earth oxides added to refining slag, and a high-alkalinity, low-oxidizing refining process to improve rare earth yield. Rare earth inclusions and nozzle turbulence are modified through calcium-magnesium composite treatment, achieving rare earth micro-alloying to replace high-alloy additions. While meeting the mechanical properties and high corrosion resistance of 355MPa grade weathering steel, it significantly reduces alloy costs by more than 15% compared to traditional weathering steel. The process flow is compatible with existing production lines and is suitable for industrial mass production.

The present application relates to the comprehensive field of mineral resources and the technical field of energy saving and consumption reduction, and particularly relates to application of coal ash in reduction of phosphate ore to obtain yellow phosphorus and a method for reduction of phosphate ore to obtain yellow phosphorus. The method comprises: in a non-oxidizing atmosphere, reduction reaction is carried out on a mixture containing phosphate ore, a reducing agent and a flux, yellow phosphorus furnace gas obtained is subjected to water washing and cooling, so that phosphorus steam in the yellow phosphorus furnace gas is stored in water in liquid or solid form, and yellow phosphorus is obtained; wherein the flux is selected from coal ash and optional silica; wherein the temperature of the reduction reaction is not lower than 1300 DEG C. The method provided by the present application can effectively improve the reduction rate of phosphate ore and shorten the reduction reaction time; the method realizes recycling utilization of coal ash resources.

The present application relates to a kind of quick heat-conducting sand mould material and its preparation method, and the sand mould material is mainly composed of heat-conducting aggregate and high-temperature working matrix, and the raw material is alpha-alumina powder, additional high-thermal-conductivity aggregate, magnesium oxide aggregate, binder RTV silicone rubber, wherein the main raw material of heat-conducting aggregate is sintered magnesium oxide particle aggregate, graphite particle, water glass solution and silica ash.By using the present application as a casting mold, the stress cracking phenomenon on the surface of zirconium-chromium corundum blank is significantly reduced, and the product qualification rate of the material is significantly increased.The present application can effectively solve the stress cracking problem during the annealing process of melting and casting zirconium-chromium corundum.

This invention relates to a method for preparing micro-modified rubber powder, belonging to the field of road engineering technology, and solves the problem of poor workability of rubber-modified asphalt prepared using existing rubber powder when applied to national and provincial trunk roads and urban highways. The preparation method includes the following steps: Step 1: Activating the rubber powder for the first time and then cooling it; Step 2: Activating the cooled rubber powder for the second time to obtain micro-modified rubber powder. The rubber-modified asphalt prepared using the micro-modified rubber powder of this invention has a viscosity of 0.3-0.9 Pa·s at 135℃, exhibiting good workability.

The application provides a converter smelting control method for HRB500E steel grade. In the case that the total amount of scrap steel is unchanged, the content of chromium elements entering the converter is increased by changing the ratio of loading structure types, that is, the reasonable matching of different types of scrap steel, and the converter smelting control process is optimized, the slagging system, the oxygen supply system and the end point system are adjusted, the early slagging of the initial slag, the process slagging of the slag and the sticky final slag are realized, and the content of chromium elements in the initial molten steel can be significantly improved. The application can greatly improve the residual chromium ratio of the initial molten steel, and then reduce the addition amount of chromium alloy, and the alloy cost is significantly reduced.

The application relates to the technical field of fine chemical production, and particularly discloses a crystallization process of short-rod-shaped ivermectin, which comprises the following steps: dissolving ivermectin crude product in a crystallization solvent, heating to 50-55 DEG C, adding a crystallization agent, uniformly mixing, then cooling to 35-40 DEG C at a rate of 0.1-0.3 DEG C / min, adding ivermectin crystal seeds, continuously cooling to 5-15 DEG C, and incubating and crystallizing to obtain ivermectin products. The crystallization process of ivermectin provided by the application realizes effective control of the particle size and crystal habit of ivermectin products in the crystallization process by adopting a combination strategy of selecting a specific crystallization solvent, adding a crystallization agent and crystal seeds at specific stages, controlling the cooling rate and the incubation time, obtaining short-rod-shaped ivermectin products with uniform particle size distribution, and the products have good fluidity, are convenient for subsequent preparation application, do not need repeated crystallization for multiple times, effectively reduce the cost of the crystallization process, and have extremely high practical application value.

The application provides a lithium ion battery, which comprises a positive electrode sheet and an electrolyte; the positive electrode sheet comprises a positive electrode active material lithium iron phosphate; the electrolyte comprises an additive a and an additive b; the additive a comprises vinylene carbonate; and the additive b comprises a compound with a structure shown in formula (I) and a compound with a structure shown in formula (II). The two additives are used in combination, partially replace VC, reduce the addition amount of VC, and compared with the SEI formed by the reduction of VC, the SEI structure formed by the compound with the structure shown in formula (I) and the compound with the structure shown in formula (II) is more compact, the inhibition effect of the interface side reaction is stronger, and the effect of improving high-temperature cycle is better compared with VC.

The application discloses a carbon nanotube and carbon black composite conductive filler and a PVC conductive composite material and a preparation method thereof. The carbon nanotube and carbon black composite conductive filler comprises a composite of carbon nanotubes and carbon black obtained by mixing carbon nanotubes after surface grafting and carbon black after surface grafting through ball milling and grinding, and forms a conductive filler with a "grape cluster" structure. The structure utilizes the long-axis structure of the carbon nanotubes, prolongs the axial length of the carbon black, forms a rich conductive network, changes the point-like conduction of the carbon black into linear conduction, and after coupling, the conductive performance can be greatly improved.

The invention discloses a preparation method of an anthraquinone hydrogenation fluidized bed catalyst doped with black phosphorus, relates to the field of catalysts and carriers, and mainly solves the problem of loss of active components of an existing hydrogenation catalyst. The preparation method comprises the following specific steps: step 1, dissolving pseudo-boehmite or boehmite with an acid solution, stirring to prepare glue, mixing the prepared glue with acid, activated aluminum oxide powder and water, stirring, and adding a proper amount of auxiliary materials and dispersing agents to obtain a mixture; 2, granulating the mixture prepared in the step 1 by using a spray centrifugal dryer to obtain a carrier precursor, and roasting to obtain a fluidized bed catalyst carrier; and 3, modifying the fluidized bed catalyst carrier obtained in the step 2 by using black phosphorus, then loading an active component, and finally drying and roasting to obtain the anthraquinone hydrogenation fluidized bed catalyst. The anthraquinone hydrogenation fluidized bed catalyst prepared by the preparation method retains the advantage of high hydrogen efficiency of a fluidized bed catalyst, more importantly, active components are not easy to lose after the catalyst is used, the service life is prolonged, and the anthraquinone hydrogenation fluidized bed catalyst is beneficial to recycling. In addition, the preparation method is simple and suitable for large-scale production.