12results about How to "Reduce sulfur content" patented technology

The invention provides a low-sulfur manganese-silicon alloy and a production method thereof.The method comprises the steps that silica, coke and manganese ore are crushed and then mixed with lime, and smelting raw materials are obtained; a closed electric furnace is filled with smelting raw materials for smelting, and alloy melt is obtained; the alloy melt is transferred into a ladle, a desulfurizing agent is added for the desulfurization process, and manganese-silicon alloy molten iron is obtained; and the manganese-silicon alloy molten iron is poured into a mold for ingot casting, and a manganese-silicon alloy finished product is obtained after cooling. According to the method, the method capable of effectively reducing the sulfur content in the manganese-silicon alloy is provided through the steps of raw material crushing and mixing, in-furnace power transmission refining, out-of-furnace desulfurization, casting molding and the like, the low-sulfur manganese-silicon alloy is produced, and therefore control over the sulfur element content in a steelmaking product is facilitated.

The invention discloses a sulfur-free FR-4 copper-clad plate and a preparation method thereof, and belongs to the technical field of copper-clad plates. The copper-clad plate is prepared from sulfur-free epoxy resin, a sulfur-free curing agent, a sulfur-free flame retardant, organic silicon hybrid macromolecules, tetrafunctional epoxy resin, linear phenolic resin, microencapsulated ammonium polyphosphate, melamine cyanurate, surface grafting modified boehmite nanorods and filler. Through the design of a sulfur-free system, the sulfur content of the product is lower than 50 ppm, and the problems of contact resistance increase, unstable signal transmission and the like caused by sulfide migration of a traditional FR-4 copper-clad plate in a high-temperature and high-humidity environment are thoroughly solved. Meanwhile, the organic silicon hybrid macromolecules and the high-functionality epoxy resin have a synergistic effect, so that the balance of high glass transition temperature and high toughness is realized. The copper-clad plate has excellent dielectric property, flame retardant property and long-term reliability, and meets the development requirements of high reliability and high performance of electronic products.

The application relates to the technical field of ultrahigh-strength steel, and provides an ultrahigh-strength weather-resistant steel bar and a production method thereof.The production method of the ultrahigh-strength weather-resistant steel bar comprises the following steps: preheating waste steel, smelting the waste steel after preheating and smelting auxiliary materials in an electric arc furnace, controlling a smelting end point, transferring the molten steel after electric arc furnace smelting into an LF refining furnace, adding stainless steel waste into the LF refining furnace for refining, adding alloy fine-tuning components, controlling the molten steel component at the refining end point, performing whole-process protective casting on the molten steel after refining, obtaining a continuous casting billet, performing rolling, tempering and cooling treatment on the continuous casting billet after heat supplement, and obtaining the ultrahigh-strength weather-resistant steel bar.The ultrahigh-strength weather-resistant steel bar has a finished product tensile strength Rm of greater than or equal to 1000 Mpa, a yield strength Rel of greater than or equal to 800 Mpa, and a breaking elongation A of greater than or equal to 10%.

The application discloses a dry gas deep desulfurization process. The process comprises the following steps: (1) removing hydrogen sulfide from refinery dry gas through a first-stage amine liquid absorption tower; (2) removing organic sulfur from tail gas of the first-stage amine liquid absorption tower in a low-temperature absorption tower; (3) sequentially exchanging heat between the absorption tail gas and raw dry gas, and between the absorption tail gas and hydrolysis tail gas, and then heating the absorption tail gas, and then inputting the absorption tail gas into a hydrolysis reactor to convert carbonyl sulfur into hydrogen sulfide; and (4) inputting the hydrolysis tail gas into a second-stage amine liquid absorption tower, and countercurrently absorbing the hydrolysis tail gas with lean amine liquid in the tower to remove hydrogen sulfide in the dry gas. The application can purify and remove sulfides in the dry gas, reduce the content of organic sulfur and hydrogen sulfide in the gas, reduce the content of SO2 in flue gas discharged from a heating furnace of each subsequent device, and ensure safe, environmentally-friendly and efficient and stable operation of the heating furnace of the whole plant.

The invention discloses a waste mineral oil multistage coupling heat exchange and gradient cooling energy-saving cooperative treatment method, which belongs to the technical field of heat energy engineering and energy conservation, and comprises the steps of pretreatment refining, fractionation cutting, molecular distillation, hydrofining, gradient cooling and intelligent control. By constructing a multi-stage coupling heat exchange network, hydrofining high-temperature waste heat is used for preheating fractionation feed, and fractionating tower top steam waste heat is used for preheating molecular distillation feed; cooling the high-temperature material flow according to the temperature by stages through a three-stage gradient cooling system, and recycling the low-temperature cold energy of the molecular distillation unit for a pretreatment process; and dynamically optimizing heat exchange and cooling operation based on an energy balance model through the central control system. According to the method, the technical problems of energy utilization splitting and serious waste heat waste in a waste mineral oil regeneration process are solved, the yield and the quality of a base oil product are greatly improved while the system energy consumption and the cooling water consumption are remarkably reduced, and an innovative solution is provided for efficient regeneration of the waste mineral oil.

The invention discloses a method for refining low-carbon low-sulfur steel through vacuum carbon deoxidation, and relates to the technical field of molten steel external refining. The process method comprises the following steps: carrying out pre-deoxidation by adopting a carbon source alloy material without using a metal deoxidation material; vacuum carbon deoxidation treatment is carried out under the condition that the vacuum degree is smaller than or equal to 100 Pa; the flow of the stirring gas is controlled to be 0.2-1.0 NL / (t.min); controlling the vacuum holding time to be not more than 5 minutes and the vacuum period to be not more than 15 minutes; the method comprises the following steps: controlling the tapping temperature of a primary smelting furnace to be 1620-1680 DEG C; in the LF station refining process, the binary alkalinity of refining slag is controlled to be 5.0-8.0, and diffusion deoxidation and white slag making are conducted in cooperation with a metal deoxidizing agent; the low-carbon and low-sulfur steel is produced through organic combination of vacuum carbon deoxidation and LF refining on the premise that a metal deoxidation material is not used for pre-deoxidation, the total oxygen content in the steel can be controlled to be 15 ppm or below, and the sulfur content can be controlled to be 0.005% or below.

This invention discloses a combined production process and system for co-producing needle coke and low-sulfur petroleum coke. The combined production process includes the following steps: a catalytic slurry is mixed with ethylene tar and subjected to a hydrogenation reaction; the hydrogenation reaction products are separated to obtain gas, naphtha, hydrogenated wax oil, and hydrogenated tail oil; the hydrogenated wax oil enters a cracking unit for a cracking reaction; the cracking reaction products are separated to obtain light oil, middle distillate oil, and residual oil; the middle distillate oil is used as feedstock for needle coke production in a needle coke production unit; the residual oil and hydrogenated tail oil are mixed and fed into a low-sulfur petroleum coke production unit to produce low-sulfur petroleum coke. This invention also provides a combined production system for co-producing needle coke and low-sulfur petroleum coke. This effectively solves the problem of excessive hydrogen supply during needle coke production from the hydrogenated slurry, and the problem of short start-up cycles for delayed coking units due to the poor thermal stability of ethylene tar.

The utility model relates to the field of gas field production, in particular to a sulfur-containing natural gas sampling device which comprises a sampling bottle, the sampling bottle is provided with a piston, a sampling bottle valve and an atmosphere communication port, and the atmosphere communication port is provided with an atmosphere communication valve; the sampling joint is communicated with the sampling bottle valve, and a sampling joint valve is arranged between the sampling joint and the sampling bottle valve; the detection joint is communicated with the sampling bottle valve; a detection joint valve is arranged between the detection joint and the sampling bottle valve; the sulfur removal box is communicated with the sampling bottle valve, a sulfur removal box valve is arranged between the sulfur removal box and the sampling bottle valve, the sulfur removal box is provided with an exhaust port, and sulfur removal materials are contained in the sulfur removal box. The sulfur-containing natural gas in the sampling device is discharged into the atmosphere after being treated by the sulfur removal material in the sulfur removal box, so that the sulfur content in the natural gas is reduced, and the pollution to the atmospheric environment is reduced.

The application provides a blast furnace gas desulfurizer regeneration device and a regeneration method, and belongs to the technical field of blast furnace gas fine desulfurization, wherein the blast furnace gas desulfurizer regeneration device comprises a regeneration box body, and the regeneration box body is internally provided with a buffer chamber, a reaction chamber and a material conveying chamber; the buffer chamber is communicated with a circulating water pool; the buffer chamber and the reaction chamber are communicated through a flow passage, and the flow passage is internally provided with a first switch; the reaction chamber is communicated with a feeding pipe; the reaction chamber is internally provided with a first liquid return pipe; the material conveying chamber is communicated with the lower part of the reaction chamber through a flow port and a second switch, and the lower end surface of the material conveying chamber is provided with a first material conveying port and a second material conveying port provided with a filter screen. The blast furnace gas desulfurizer regeneration device and the regeneration method provided by the application realize the regeneration of the desulfurizer in the circulating water by setting the buffer chamber, the reaction chamber and the material conveying chamber to react the circulating water with the iron salt, to generate the precipitation by reacting the sulfur in the circulating water, to reduce the sulfur content in the circulating water and to reduce the desulfurizer.

This invention discloses a 635MPa grade niobium-vanadium-chromium composite reinforced high-performance steel bar and its smelting method. By controlling the chemical composition and V / N mass ratio of the steel bar within the range of 3.35 to 3.75, and employing a multi-element composite strengthening formula of niobium, vanadium, and chromium to replace the traditional single vanadium-nitrogen alloy addition mode, production costs are reduced. During the smelting process, a dedicated dry powder stirring device is used to pre-mix the microalloying reinforcing agent, achieving uniform mixing of powder components and removal of magnetic impurities. Simultaneously, a composite desulfurizing agent is introduced and a step-by-step addition process is adopted, combined with a gradient ladle bottom-blowing argon stirring system, to effectively reduce the sulfur content in the steel. The steel bar prepared by this invention has a uniform microstructure, high grain size, and excellent mechanical properties such as tensile strength, yield strength, strength-to-yield ratio, and elongation. It exhibits good product consistency, low production costs, and can stably mass-produce high-performance 635MPa grade high-strength earthquake-resistant steel bars.

This disclosure provides ferric phosphate, its preparation method, and its application. The preparation method includes the following steps: (1) mixing ferrous salt, phosphorus source, and solvent to obtain a mixed salt solution, and freezing the mixed solution to obtain a frozen mixed salt solution; (2) placing the frozen mixed salt solution in a reflux device, controlling the reflux of hydrogen peroxide solution between the reflux device and the reaction device, controlling the concentration of hydrogen peroxide in the system to carry out the reaction, until the frozen mixed salt solution is completely dissolved; (3) adjusting the pH in the system to carry out an aging reaction, and separating the solid and liquid to obtain the ferric phosphate. In this disclosure, the solution containing ferrous salt and phosphorus source is frozen in advance, and hydrogen peroxide is controlled to flow through the frozen mixed salt solution. By controlling the concentration and flow rate of hydrogen peroxide, the reaction can be carried out slowly, so that the iron and phosphorus elements in the prepared ferric phosphate precursor are evenly distributed and have few surface defects.

The application relates to the technical field of secondary battery positive electrode materials, in particular to a desulfurization method of sulfur-containing metal salt, a battery-grade metal salt and a preparation method and application thereof. The desulfurization method of the sulfur-containing metal salt can effectively reduce the sulfur content in the metal salt, has the advantages of good desulfurization effect, low cost, high repeatability, few by-products and the like. Especially, the S impurity content in the material can be effectively reduced to below 800 ppm, meeting the requirement of 800 ppm sulfur impurity of the battery-grade phosphate or carbonate.