1213 results about "Sulfur content" patented technology

The invention discloses ultralow-temperature high manganese steel and a manufacturing method of an ultralow-temperature high manganese steel plate. The ultralow-temperature high manganese steel comprises the following components in percentage by weight: 0.35-0.55% of C, 0.01-0.10% of Si, 20.00-30.00% of Mn, 0.01-0.10% of Al, less than or equal to 0.005% of P, less than or equal to 0.003% of S, 3.0-5.0% of Cr, 0.3-1.0% of Cu, 0.2-1.20% of Ni, less than or equal to 0.008% of N, less than or equal to 0.002% of O, less than or equal to 0.0002% of H and the balance of Fe and inevitable impurity elements. The manufacturing method of the ultralow-temperature high manganese steel plate comprises the steps of molten iron pretreatment, K-OBM-S converter smelting, LF refining, continuous casting, annealing and coping, hot rolling, online solution treatment and the like. According to the method, high steel purity, low phosphorus and sulfur content, small segregation of the casting blank and the steel plate, good macrostructure of the casting blank and no crack on the surface and in the casting blank can be guaranteed, and the finished steel plate has the characteristics of low yield ratio, high tensile strength, high ultralow-temperature toughness, small thermal expansion coefficient, good fatigue resistance and the like; through the implementation of the invention, the manufacturing cost of the steel for the liquefied natural gas storage tank can be reduced to 1 / 3 of that of 9% Ni steel in the prior art.

The invention relates to the technical field of petrochemical engineering, and particularly discloses a preparation method of a high-sulfur and high-acid crude oil demulsifier, which comprises the following steps: uniformly mixing 40-60 parts by mass of modified polyether, 25-30 parts by mass of zwitterionic surfactant and 10-12 parts by mass of solvent, heating to 50-70 DEG C, reacting for 1-2 hours, and cooling to room temperature to obtain the high-sulfur and high-acid crude oil demulsifier. Adding 3-8 parts by mass of activated aluminum oxide, 8-16 parts by mass of an antacid and 2-4 parts by mass of a corrosion inhibitor, uniformly mixing, adding 0.5-1 part by mass of a defoaming agent, uniformly mixing, cooling, and standing for layering to obtain a demulsifier; the antacid comprises ethanolamine and zinc oxide. The demulsifier prepared by the invention not only has excellent performance in the aspects of dehydration and promotion of oil-water separation, but also can improve the quality of crude oil and reduce the acid value and the sulfur content to a certain extent.

The invention provides a treatment method for low-grade multi-metal gold concentrate, and relates to the technical field of comprehensive utilization of minerals. According to the treatment method of the low-grade multi-metal gold concentrate, most of iron and copper form iron-copper matte through pyrogenic smelting, meanwhile, gold is captured into the iron-copper matte, then iron-copper matte powder is obtained after water quenching and ball milling, the iron-copper matte powder is subjected to oxidation ammonia leaching, copper in the iron-copper matte is extracted, and the iron-copper matte powder is subjected to oxidation ammonia leaching to obtain the low-grade multi-metal gold concentrate. The obtained copper-containing ammonia leaching liquid is subjected to a traditional extraction-reverse extraction-electrodeposition process to obtain an electrodeposited copper product, ammonia leaching residues obtained after copper extraction are subjected to cyanidation leaching, gold in the ammonia leaching residues is extracted, cyanidation liquid is subjected to a traditional gold extraction process to obtain a gold product, the cyanidation tailings mainly comprise iron sulfide, the content of iron and sulfur in the tailings is high, and the content of sulfur in the tailings is high. And the subsequent cinder can be directly sold as an iron-making raw material. The amount of iron-silicon slag generated by the method is extremely low, and compared with a traditional molten pool smelting method, the comprehensive utilization rate of iron in the multi-metal gold concentrate is greatly increased.

The invention relates to the technical field of steel and iron smelting, and particularly discloses an ultra-low sulfur steel smelting method, which comprises the following steps of: washing a converter and washing a steel ladle before converter smelting; in the desulfurization process, high-temperature molten iron is used, deep desulfurization is conducted through a KR desulfurization method, and the sulfur content of the molten iron is smaller than or equal to 0.003%; converter working procedure: smelting by using a top-bottom combined blown converter, adopting a single-slag remaining method, adding self-produced first-class scrap steel, using low-sulfur lime, dolomite and iron-containing oxide, and controlling the end point of the converter: controlling the tapping carbon to be less than or equal to 0.04%, sulfur to be less than or equal to 0.005% and the temperature to be more than or equal to 1610 DEG C, adding lime for slag washing in the tapping process, adding part of lime for thick slag treatment after the tapping is finished, and then performing slagging-off operation; a refining process: adding lime and refining slag for slagging and desulphurizing, and finely adjusting components and raising the temperature; a continuous casting process: carrying out continuous casting; and finally, sulfur in a casting blank smelting finished product is less than or equal to 6ppm.

The invention discloses a high-specific-surface-area low-sodium-sulfur ternary precursor as well as a preparation method and application thereof. The preparation method comprises the following steps: adding a nickel-cobalt-manganese salt solution, a precipitant and a complexing agent into a first reaction kettle, and carrying out a co-precipitation reaction in an inert atmosphere to obtain a crystal nucleus with the particle size D50 of 1.0-1.6 [mu] m; and adding the crystal nucleus, a nickel-cobalt-manganese salt solution, a precipitator and a complexing agent into a second reaction kettle, carrying out a coprecipitation reaction in an inert atmosphere, then carrying out a coprecipitation reaction in an oxidizing atmosphere, and stopping the reaction when the product granularity D50 is 3.8-4.2 microns to obtain the high-specific-surface-area low-sodium-sulfur ternary precursor. The ternary precursor prepared by the method is narrow in particle size distribution and good in sphericity, primary particles are flaky and grow in the radial direction, secondary particles are porous, the product batch stability is high, and production operation is convenient.

The present invention belongs to the technical field of desulfurization activated carbon regeneration, and relates to a blast furnace gas desulfurization activated carbon regeneration process and device, the regeneration device includes a washing and extraction tank, a regeneration reactor, a gas detection and analysis system, an automatic control system, a temperature monitoring system, and a deoxygenation reactor; the regeneration process includes S1, washing and extraction, S2, heating regeneration: according to the sulfur content of the outlet gas of the regeneration reactor, the heating temperature is adjusted by gradient, and the temperature range of the regeneration reactor is controlled: 150-300°C, and the temperature gradient is 30-50°C; S3, gas circulation, air oxidation, so that elemental sulfur is precipitated from polysulfide. The regeneration process of the present invention has a small carbon loss rate, increases the number of regenerations, and further reduces costs; the temperature of the thermal regeneration process is 150-300°C, the regeneration temperature is low, and the regeneration temperature can be adjusted according to the outlet gas concentration gradient, reducing energy consumption, and at the same time ammonia resources can be recycled, reducing the amount of solution used and the amount of waste liquid discharged, and the regeneration process can obtain elemental sulfur with economic value.

High quality coke products including unique properties, such as Coke Reactivity Index (CRI) properties, fixed carbon content, and sulfur content.

The application provides a method for grading diesel deep hydrodesulfurization catalysts, which comprises the following steps: loading catalysts containing AlPO4-5 phosphorus aluminum molecular sieves and catalysts containing ETS-10 titanium silicon molecular sieves in the upper and lower parts of a fixed bed hydrogenation reactor respectively according to a loading mass ratio of 1:3-3:1, so that diesel is subjected to hydrodesulfurization reaction through catalysts containing AlPO4-5 phosphorus aluminum molecular sieves first and then through catalysts containing ETS-10 titanium silicon molecular sieves; the carrier of the catalysts containing AlPO4-5 phosphorus aluminum molecular sieves comprises AlPO4-5 phosphorus aluminum molecular sieves and aluminum oxide powder, the carrier of the catalysts containing ETS-10 titanium silicon molecular sieves comprises ETS-10 titanium silicon molecular sieves and aluminum oxide powder, and the active components of the two kinds of catalysts respectively comprise a combination of two or three of nickel oxide, molybdenum oxide and cobalt oxide. The sulfur content of the hydrogenated diesel obtained through the method can be as low as 10 μg / g or below.

The invention provides a coal gelatinous layer index prediction method and system based on machine learning, and relates to the technical field of coal detection, and the method comprises the steps: S1, collecting a coal sample, and carrying out the parameter measurement of the coal sample to obtain a plurality of coal sample features; s2, selecting strong correlation coal sample features related to the coal gelatinous layer index from the coal sample features through feature screening; and S3, inputting each strong correlation coal sample feature into a pre-trained machine learning model to obtain a predicted value of the coal gelatinous layer index. The method has the beneficial effects that the machine learning model is adopted, coal sample characteristics such as moisture, ash content, volatile components, sulfur content and caking index of the coal sample are collected and input into the machine learning model obtained through pre-construction and training to predict the gelatinous layer index, the determination process of a traditional physical heating method is not needed, the problems of low efficiency, high pollution and large error of a traditional technology are solved, and the method is suitable for popularization and application. And rapid, lossless and high-precision index prediction is realized.

The present invention relates to a method for producing a carbon material having a sulfur content of less than 0.8 wt%, a BET specific surface area of less than 20 m2 / g, and an average grain size (Lc) in the direction of the c-axis of less than # imgabs0 # as determined using X-ray diffraction. The method comprises the steps of: providing a bio-based carbon precursor, the bio-based carbon precursor having a sulfur content in the range of 1.0 to 5.0 wt%; subjecting the bio-based carbon precursor to a heat treatment in an inert atmosphere to obtain a carbon material; and subjecting the carbon material to a desulfurization treatment in an inert atmosphere comprising hydrogen and / or at least one carbonaceous gas to remove sulfur from the carbon material and obtain a carbon material having a sulfur content of less than 0.8 wt%.

The invention discloses an iron-doped manganous-manganic oxide material and a preparation method and application thereof.According to the iron-doped manganous-manganic oxide material and the preparation method and application thereof, manganese sulfate serves as a manganese source, DTPA ferric ammonium salt serves as a complexing agent and a doping agent, ammonia water serves as alkali liquor, ethyl alcohol serves as a dispersing agent, and the preparation process is optimized in a targeted mode; the iron-doped manganous-manganic oxide material with uniform particle size distribution is prepared, the doping uniformity of the iron element in large-size micron-sized manganous-manganic oxide particles is improved while the sulfur content in the material is reduced, and the product is good in particle size uniformity and high in tap density. In addition, the process provided by the invention also has the characteristics of simple flow, easiness in operation, low input cost, high economic benefit and large-scale popularization and application.

Even when used for polishing a semiconductor wafer provided with a silicon nitride film, there is provided sulfonic acid-modified colloidal silica capable of forming a highly flat polished surface at high speed. Sulfonic acid-modified colloidal silica, wherein the sulfur content of the silica particles is 700 mass ppm or more and less than 3000 mass ppm per 1 g of the silica particles, the sulfur content in the solvent is 250 mass ppm or less per 1 g of the solvent, and the content of coarse particles having a particle size of 0.2 μm or more contained in the silica particles is 10,000,000 particles / mL or less when the silica particle concentration is 1 mass%.

The present application relates to the technical field of battery materials, and provides iron phosphate having low sulfur content and a high iron-phosphorus ratio, a preparation method therefor, and a use thereof. The preparation method for the iron phosphate having low sulfur content and a high iron-phosphorus ratio comprises: providing amorphous iron phosphate; adding water and phosphoric acid into the amorphous iron phosphate for slurrying treatment, and then heating and aging to obtain an aged slurry; carrying out slurry washing and filter pressing on the aged slurry to obtain a first filter cake; adding water and a first pH regulator into the first filter cake for slurry washing to obtain a first slurry having a pH value range of 3.0-5.0, and carrying out filter pressing on the first slurry to obtain a second filter cake; and rinsing, drying and calcining the second filter cake to obtain iron phosphate having low sulfur content and a high iron-phosphorus ratio. The present application facilitates preparation of iron phosphate having low sulfur content, a high iron-phosphorus ratio, and a large specific surface area. The iron phosphate can be used for preparing lithium iron phosphate having good electrochemical performance, and the lithium iron phosphate can be further used for preparing a positive electrode sheet and a secondary battery having good electrochemical performance.

A method and system for determining coal blending schemes for different coal types in a thermal power plant. The method comprises: acquiring coal type data of a coal yard and historical operation data of a coal treatment apparatus and a coal environmental protection system; on the basis of the coal type data of the coal yard and the historical operation data of the coal treatment apparatus and the coal environmental protection system, establishing constraint conditions for minimum calorific value, ignition stability, sulfur content, moisture content and ash content of blended coal fed into a boiler; on the basis of the constraint conditions, determining the blending and firing ratio for different coal types, so as to obtain a plurality of coal blending schemes; and by using the lowest comprehensive power supply cost as an objective, establishing an objective function, solving objective function values for the plurality of coal blending schemes, and, on the basis of the objective function values, obtaining a final coal blending scheme of the thermal power plant. The present invention determines various constraint conditions for blended coal on the basis of the current operation status of unit apparatuses, such that the coal blending and firing scheme better conforms to the actual operation conditions of a unit. In addition, since the coal blending scheme is obtained by performing big data analysis on various data, the method is simple and feasible, involves relatively low cost, and can increase the blending proportions of economical coal types, thereby lowering power generation cost, improving resource utilization efficiency, and realizing sustainable development of energy.

The invention discloses an RFID-based blowout preventer group full life cycle evaluation method, which belongs to the field of petroleum well safety monitoring, and comprises the following steps: installing an RFID tag on a blowout preventer, monitoring functional data such as pressure, flow, temperature and sulfur content parameters in a blowout preventer group cavity, and establishing a blowout preventer group simulation model; further establishing a blowout preventer group full information storage database; correcting and predicting the simulation model; carrying out full life cycle monitoring on the blowout preventer group according to the RFID tag; according to the simulation model and the prediction model, performing safety prediction on a blowout preventer group flashboard, a blowout preventer group rubber core and a blowout preventer group flange connection seal of the blowout preventer assembly; and S6, the blowout preventer assembly is maintained according to the safety prediction result, based on the RFID technology, the pressure, the temperature, the sulfur content, the flow and other environmental parameters in a blowout preventer cavity under the blowout working condition can be more truly sensed, and more reliable data are provided for safety prediction of the blowout preventer assembly.

The invention discloses an intelligent coal blending method and system for dual-engine staged solution in a power coal scene. The method comprises the following steps: performing structured processing on coal source data and establishing a hundred-ton integer batch variable; the method comprises the following steps of: constructing a hard constraint integer programming (ILP) model, and sequentially executing three stages of solving of cost minimization, heat value deviation minimization under the fixed cost and coal source quantity minimization under the fixed cost and deviation; when any stage is not feasible, automatically switching to a soft constraint target planning (GP) model, performing soft constraint on the coal quality index through a deviation variable, and sequentially performing deviation minimization, cost minimization and coal source quantity minimization; and calculating a combustion stability index (CSI) on the basis of volatile component fluctuation, fixed carbon, ash content change and sulfur content change, and carrying out stability verification on a final coal blending scheme. The system comprises a data management module, a first engine module, a second engine module, an automatic rollback module, a combustion stability index module and a result output module.

The invention belongs to the technical field of soil content testing, particularly relates to a device and a method for testing the content of sulfur in soil based on an infrared absorption principle, and aims to solve the problems that gas flows into another detection pool along with introduction, and the residence time is difficult to control during detection, so that the detection time is insufficient, data errors are easy to occur and the like. In order to solve the problems that gas in a single detection pool cannot be uniformly distributed, and the distribution of the gas in the single detection pool is not uniform, the invention provides the following scheme: the device comprises a base bracket, the top of the base bracket is fixedly connected with a combustion bottom bin, the outer wall of the combustion bottom bin is fixedly connected with a connecting bracket, and the outer wall of one side of the connecting bracket is fixedly connected with a combustion bin; a mounting opening is formed in the top of the combustion bin. The device and method for testing the sulfur content in the soil based on the infrared absorption principle have the effect of improving the accuracy of detection data, the residence time of sulfur-containing gas in the detection chamber is prolonged during use, meanwhile, the sulfur-containing gas is distributed more uniformly, and the accuracy of the detection data is improved.

According to the ultralow-sulfur ultralow-oxygen electrolytic high-purity iron preparation method, electrolyte adopts a chlorate system, the removal rate of the sulfur element can be increased by 90% or above, the sulfur content in an electrolytic iron product is lower than 0.1 ppm, quality improvement of the electrolytic high-purity iron is facilitated, in addition, a reduction furnace is adopted for deoxidation, the oxygen content of the electrolytic iron can be reduced by 90% or above, and the quality of the electrolytic high-purity iron is improved. And the oxygen content in the electrolytic iron reaches below 10ppm, so that the difficulty of high oxygen content in the electrolytic iron is solved.

The invention discloses a method for measuring high and low calorimetric values of blast furnace fly ash, which relates to the technical field of blast furnace fly ash calorimetric values, and comprises the following specific steps: step 1, calibrating the thermal capacity of a calorimeter, continuously measuring a plurality of groups of thermal capacity data, and carrying out average value calculation to obtain the average thermal capacity data of the calorimeter to finish calibration; 2, measuring as received basis moisture of the sample; 3, measuring the air dry basis moisture of the sample; 4, measuring the air dry basis total sulfur content of the sample; 5, measuring the air dry basis hydrogen content of the sample; 6, measuring the cylinder calorific value of the sample; and 7, calculating high and low calorific values. According to the method, a rapid calorimeter is adopted as a detection instrument, a blast furnace dedusting ash sample is put into a sealed oxygen bomb filled with high-pressure pure oxygen to be burnt, the calorific value of a bomb cylinder is obtained, the moisture, total sulfur and hydrogen content of the bomb cylinder are measured and brought into a calorimeter testing system to be calculated, and therefore the high and low calorific values of the blast furnace dedusting ash are measured.

A process for reducing the environmental contaminants in a ISO 8217 compliant Feedstock Heavy Marine Fuel Oil, the process involving: mixing a quantity of the Feedstock Heavy Marine Fuel Oil with a quantity of Activating Gas mixture to give a feedstock mixture; contacting the feedstock mixture with one or more catalysts to form a Process Mixture from the feedstock mixture; separating the Product Heavy Marine Fuel Oil liquid components of the Process Mixture from the gaseous components and by-product hydrocarbon components of the Process Mixture and, discharging the Product Heavy Marine Fuel Oil. The Product Heavy Marine Fuel Oil is compliant with ISO 8217 for residual marine fuel oils and has a sulfur level has a maximum sulfur content (ISO 14596 or ISO 8754) between the range of 0.05% wt. to 0.5% wt. The Product Heavy Marine Fuel Oil can be used as or as a blending stock for an ISO 8217 compliant, IMO MARPOL Annex VI (revised) compliant low sulfur or ultralow sulfur heavy marine fuel oil. A device for conducting the process is also disclosed.

The invention discloses a multispectral combined coal multi-index on-line rapid detection system and a multispectral combined coal multi-index on-line rapid detection method. The multispectral combined coal multi-index on-line rapid detection system comprises a coal sample conveying device, a spectrum fusion analysis device and a control device. The coal sample conveying device is used for conveying coal samples; the spectrum fusion analysis device is used for detecting and analyzing the coal sample and comprises an X-ray spectrum detection unit, a near-infrared detection unit and a laser-induced breakdown spectroscopy unit, the X-ray spectrum detection unit is used for obtaining an X-ray fluorescence spectrum of the coal sample, and the near-infrared detection unit is used for obtaining a near-infrared spectrum of the coal sample; the laser-induced breakdown spectroscopy unit is used for acquiring a plasma spectrum of the coal sample; and the spectrum fusion analysis device is electrically connected with the control device. According to the rapid detection system provided by the embodiment of the invention, online real-time prediction of the caking index, the calorific value, the ash content, the total moisture content, the total sulfur content, the volatile component and the ash fusion point of the coal is realized, and real-time data support is provided for coking coal blending process optimization and metallurgical coke quality control.

The invention discloses a ship high-sulfur fuel oil monitoring method based on a Gaussian plume model, and the method aims at ship flue gas remote sensing monitoring, based on the diffusion concentration of sulfur dioxide discharged by a ship at a monitoring point, an optimization algorithm is utilized, an emission source intensity inversion problem is resolved into an objective function unconstrained multi-dimensional extreme value problem, and a ship high-sulfur fuel oil monitoring result is obtained. According to the method, the emission source intensity of the ship is calculated, and the ship fuel oil consumption amount calculated by the basic information of the ship is combined, so that an underway ship fuel oil sulfur content back calculation method without the help of the carbon dioxide concentration is established, and the ship with the sulfur content exceeding the standard is effectively identified. Meanwhile, in consideration of the fact that the wind direction and the line source direction are not completely consistent in the actual navigation environment, a Gaussian plume model corrected by combining the included angle between the wind direction and the line source, the effective height of the ship flue gas emission source, the effective wind speed and the diffusion coefficient is constructed, and the accuracy of the ship high-sulfur fuel oil monitoring result is further improved.

The invention discloses a high-temperature and high-pressure visual elemental sulfur reaction device and an elemental sulfur analysis method. The reaction device comprises a reaction kettle mechanism, a heating mechanism, a pressure control mechanism and a visual monitoring mechanism; the analysis method comprises the following steps: (1) transferring a sample under simulated temperature and pressure conditions; (2) checking the gas tightness of the natural gas elemental sulfur equipment; (3) measuring elemental sulfur and the like. The device can be used for elemental sulfur reaction under high-temperature and high-pressure conditions, meanwhile, the visual window can observe the whole reaction evolution process in real time and online through a high-definition camera monitoring system, videos are recorded, and a playback viewing function is achieved; the problem of detecting the content of natural gas dissolved elemental sulfur in oil and gas reservoir fluid is solved.

The present invention relates to a crop nutrition and fortifying composition comprising an effective amount of the following ingredients: elemental sulfur; one or more magnesium salt derivatives or mixtures thereof; one or more potash fertilizers or salts or derivatives or mixtures thereof; one or more iron salts or derivatives or mixtures thereof; one or more zinc salts or derivatives or mixtures thereof; and one or more excipients. The composition comprises particles having a particle size ranging from 0.1 to 50 [mu] m wherein the elemental sulfur content is from 5% to 90% by weight; the content of the element magnesium is 0.1%-40% (weight percentage); the content of the element potassium is 0.1%-40% (weight percentage); the content of the element iron is 0.1%-45% (weight percentage); and the content of the element zinc is 0.1-45% of the total weight of the composition. The invention also relates to a method for preparing the crop nutrition and fortifying composition, and a method for treating a plant, a seed, a crop, plant propagation material, a locus, parts thereof or soil using the crop nutrition and fortifying composition.

The invention relates to a method for stably controlling the pH value of desulfurization slurry based on theoretical slurry supply amount, which belongs to the field of desulfurization and comprises the following steps: (1) calculating the mass and the amount of substance of SO2; (2) calculating the mass of CaCO3 required for absorbing SO2; (3) calculating the basic slurry supply flow for keeping the pH value of the absorption tower unchanged during SO2 absorption, obtaining the CaCO3 mass required for SO2 absorption through the step (2), obtaining the limestone slurry density through a limestone slurry densimeter, and obtaining the required limestone slurry supply amount; (4) calculating the pH deviation limestone slurry flow compensation amount; and (5) obtaining a theoretical slurry supply amount. The method has the advantages that the problem that the slurry supply amount cannot rapidly track the change of boiler load and the sulfur content of fire coal during normal operation of a normal thermal power generating unit is solved, the fluctuation range of slurry supply is reduced, and the pH value of slurry in an absorption tower is kept within a proper change range.

The invention discloses a method for detecting the content of trace sulfur in high-purity red phosphorus based on ion chromatography. The method comprises the following steps: (1) weighing 0.1-0.3 g of high-purity red phosphorus as a sample; (2) adding 2mL of nitric acid into the sample, wherein the nitric acid is electronic-grade nitric acid or high-quality pure nitric acid; (3) taking 2mL of nitric acid as a reagent blank; (4) respectively heating and digesting the sample added with nitric acid and the reagent blank under the same condition; (5) respectively heating the completely digested sample and the reagent blank under the same condition to remove acid; (6) firstly, respectively transferring the sample subjected to thorough acid removal and the reagent blank to a 50mL volumetric flask, and then respectively diluting the sample and the reagent blank with high-purity water to scales; (7) respectively taking the diluted sample and the reagent blank, and determining the content of sulfate ions in the sample and the content of sulfate ions in the reagent blank through ion chromatography; (8) calculating the content S of sulfur in the sample, wherein the content of sulfur in the sample is the content of sulfur in the high-purity red phosphorus; the method is simple, convenient to operate, good in reproducibility and low in cost.

The invention belongs to the technical field of ferrous metallurgy, particularly relates to a method for determining the LF refining slag amount of ultralow-sulfur pipeline steel, provides a molten iron-free pretreatment-single slag method ultralow-sulfur pipeline steel production process, and establishes an optimal refining slag system of the ultralow-sulfur pipeline steel. According to the method, the sulfur capacity of a refining slag system is calculated through a KTH model, the sulfur distribution ratio of the refining slag is further obtained by combining current molten steel components, the theoretical adding amount of the refining slag is accurately obtained according to the requirements of the sulfur distribution ratio, the molten steel amount, the LF refining station entering sulfur content and the LF refining station exiting sulfur content, and a refining slag amount rapid calculation model based on LF station entering sulfur content classification is provided. And when the sulfur content of the entering molten steel is less than or equal to 0.030 wt%, the optimal desulfurization efficiency of the LF is ensured based on the LF slag system optimization and accurate slag quantity control technology, stable production of the ultra-low sulfur steel can be realized under the condition of no molten iron pretreatment, and the sulfur content of a finished product is controlled within 10ppm.

The invention provides a titanium carbide preparation process, and relates to the technical field of carbide preparation, the titanium carbide preparation process comprises the following steps: S1, selecting ilmenite with the phosphorus content of less than 100 ppm, crushing, reducing, concentrating, hydrolyzing, washing and filtering to generate a titanium dioxide filter cake; the pore diameter of titanium dioxide is controlled to be 1-5nm, the phosphorus content is less than 50ppm, and the sulfur content is less than 0.1%; s2, pulping the titanium dioxide filter cake obtained in the step S1 to form primary slurry, adding carbon black according to the content of titanium dioxide, and uniformly stirring to form secondary slurry; s3, continuously stirring the secondary slurry, and pumping the secondary slurry into a spray dryer for spray drying to generate titanium dioxide-carbon black particles; and S4, the titanium dioxide-carbon black particles pass through a high-temperature roasting area under the action of airflow and gravity to generate titanium carbide powder. According to the method, the mixing uniformity of the carbon black is larger than or equal to 95%, the yield of the titanium carbide is increased to 99.5% or above, and the quality and the yield of the finished titanium carbide are greatly improved.

The invention relates to the technical field of metal smelting, in particular to a smelting method for desulfurizing a nickel-based superalloy by adding a nickel-calcium alloy, a small amount of nickel-calcium alloy is added into molten steel, the content of a harmful impurity sulfur element in the molten steel can be effectively reduced by adding the nickel-calcium alloy into the molten steel, the desulfurization rate exceeds 70%, and the nickel-based superalloy can be completely desulfurized. And the sulfur element in the finished product is controlled to be lower than 10 ppm, and the calcium content in the finished product is lower than 5 ppm, so that the subsequent process is not influenced, and the technical problems that the sulfur content in the finished product is relatively high, the high-temperature performance of the alloy is very low when the S element content of the alloy is 30 ppm and the requirement is difficult to meet due to the fact that desulfurization cannot be carried out in the smelting process and the vacuum self-consumption process in the prior art are solved in this way.

Disclosed herein is a gold powder comprises gold particles, and sulfur present on a surface of at least a part of the gold particles. A sulfur amount of the sulfur present on the surface per unit surface area is 220 μg / m2 or more and 1500 μg / m2 or less. The sulfur amount is obtained by dividing a surface sulfur amount per unit mass by specific surface area of the gold particles. The surface sulfur amount is obtained by a quantitatively analysis of a treated liquid obtained by nitric acid extraction of the gold particles.