532 results about "Sulfur content" patented technology

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.

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 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 petrochemical engineering, and relates to a continuous coking production system and process method for hydrogenated unconverted oil, and the production system comprises a membrane filter, a raw material tank, a homogenizer, a tubular furnace, a coking machine, an oil cooler and a stock bin. According to the invention, the continuous production of the high-quality petroleum coke is realized by combining a synergistic process method of membrane filtration, modification, homogeneous emulsification and tubular furnace coking machine coupling with a graphite adding and hydraulic conveying technology without a noble metal catalyst. The sulfur content, the ash content and the volatile components of the petroleum coke prepared by the technological method all meet the industrial standards, the requirement of pre-culture low-emission anode coke of electrolytic aluminum can be met, and the cost is low.

The invention relates to the technical field of petroleum refining process and industrial automatic control, in particular to a closed-loop intelligent control refined diesel hydrogenation filtration parameter optimization method which comprises the following steps: step 1, acquiring refined diesel sulfur content and raw oil flow data in real time, and generating an effective sulfur concentration sequence through dynamic weighted filtering; 2, calculating a local blockage coefficient of the catalyst; 3, outputting a real-time activity factor of the catalyst through an activity attenuation relational expression; 4, dynamically calculating and predicting the adsorption capacity; 5, generating an instruction for shortening the backwashing period and reducing the filtering rate; 6, generating a backwashing intensity adjusting instruction in proportion according to the absolute value of the sulfur concentration change slope; 7, adjusting the filtering rate, the backwashing period and the washing intensity; and 8, if the target value is not reached, returning to the step 2, and re-evaluating the activity of the catalyst. According to the method, the accuracy and the stability of the data are effectively improved, and reliable real-time data support is provided for subsequent filtering parameter optimization.

The invention provides a method for preparing high-purity vanadium pentoxide from a sodium vanadium solution. The method comprises the following steps: firstly, through chromium removal, calcium removal and silicon removal treatment, reducing the contents of chromium, calcium and silicon in the sodium vanadium solution to a target requirement, namely Crlt; the concentration is 0.005 g / L, and the concentration is Cat; 0.01 g / L, Silt; 0.01 g / L; then, aluminum is removed through a two-step method, the pH of the system can be accurately controlled, and the aluminum content in the solution is reduced to be smaller than 0.001 g / L; finally, ammonium salt is added to obtain AMV sediment, after the potassium content in the AMV sediment is preferably controlled to be reduced to 0.001 wt%, calcination is conducted, a vanadium pentoxide product can be obtained, and the sulfur content can be lower than 0.001 wt%.

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 relates to a preparation method of ultralow-carbon ultralow-sulfur low-nitrogen steel, and belongs to the technical field of ferrous metallurgy. The method comprises the following steps: smelting a raw material containing waste steel in an electric furnace to obtain first molten steel; the first molten steel is subjected to sectional type LF refining, and second molten steel with the preset sulfur content is obtained; wherein the sectional type LF refining comprises LF refining of a light desulfurization section, a slagging-off section and a deep desulfurization section for spraying calcium oxide powder which are arranged in sequence, and the temperature of the first molten steel in the light desulfurization section is controlled; and the second molten steel is subjected to RH vacuum smelting, decarburization and denitrification are conducted, oxygen blowing operation is conducted in the RH vacuum smelting process, and the ultralow-carbon ultralow-sulfur low-nitrogen molten steel is obtained. The ultralow-carbon ultralow-sulfur low-nitrogen molten steel is prepared from the following components in percentage by mass: less than 20 ppm of oxygen, less than 0.0030% of nitrogen, less than 0.0030% of sulfur and less than 0.0020% of carbon.

The invention belongs to the technical field of oil and gas storage and transportation, and discloses a novel device and method for online measurement of gas sulfur content in a sulfur-containing gas field pipeline, and the device comprises a natural gas compressor, a gas tank (variable volume type or fixed volume type), a temperature control refrigeration system, a computer, a pressure sensor, a temperature sensor and a plurality of automatic valves. A natural gas sample in a pipeline is introduced into a gas box, the temperature and / or the volume of the natural gas sample are accurately adjusted under the control of a computer, pressure, temperature and volume data in two different states are obtained, the compression factor ratio of gas is calculated accordingly, and the hydrogen sulfide concentration is indirectly determined based on the preset mapping relation between the compression factor ratio and the hydrogen sulfide concentration. The method does not need an optical or electrochemical sensitive element, avoids the interference of field dust and moisture, has the advantages of simple structure, high reliability and low maintenance cost, and is suitable for long-term stable online monitoring of the sulfur-containing natural gas pipeline.

This application discloses a nuclear-grade polyacrylic acid, its preparation method, and its applications. The nuclear-grade polyacrylic acid has a molecular weight of 100,000 to 200,000 and a sulfur content of 500 ppb to 1000 ppb. This nuclear-grade polyacrylic acid exhibits controllable molecular weight, good polydispersity, excellent scale inhibition performance, and a superior decomposition half-life. The molecular weight is controllable between 100,000 and 200,000, and the polydispersity is 1.0 to 3.5. The preparation method has a short cycle time and simple operation process; the preparation equipment is simple, and the preparation efficiency is high. The volume of the synthesis reactor used in the preparation can be adjusted according to the production volume, greatly improving the production efficiency. The preparation cost of this invention is low, and it is green, clean, and pollution-free. The raw materials used in the preparation process are inexpensive and readily available. The reactor involved only consumes a small amount of electricity, and the addition of a sulfur-free initiator and alcohol and ether-related solvents results in minimal environmental pollution.

The application provides a preparation process and evaluation method of a recarburant taking superfine carbon powder as a raw material, step 1: according to target recarburant components, different carbon content, sulfur content and nitrogen content, and superfine carbon powder with a particle size of more than 200 meshes are dosed and uniformly mixed; step 2: a composite bonding system composed of 1% inorganic binder and 1% organic binder is mixed with the superfine carbon powder to granulate, and graphite recarburant is obtained through extrusion and drying; step 3: the graphite recarburant is subjected to forming property evaluation and high-temperature thermal stability evaluation. The application realizes high-value recycling of the superfine carbon powder, reduces the production cost of the recarburant, and the prepared recarburant has the advantages of high carbon absorption rate, good high-temperature stability and environmental protection without pollution.

The application discloses a beneficiation method for complexly-embedded high-sulfur-content lead-zinc sulfide ore, which comprises one-stage rough separation, three-stage cleaning and three-stage scavenging; a zinc flotation operation comprises one-stage rough separation, three-stage cleaning and three-stage scavenging; a sulfur flotation operation comprises one-stage rough separation, one-stage cleaning and one-stage scavenging; a sulfur concentrate dezincing operation comprises one-stage rough separation, one-stage cleaning and one-stage scavenging, calcium oxide is added in the one-stage cleaning process, a zinc collecting agent is added in the one-stage scavenging process, and tailings after the one-stage cleaning and concentrate after the one-stage scavenging are returned to the one-stage rough separation of the sulfur concentrate dezincing operation. The column machine is combined to improve the recovery rate of useful minerals, the flotation column is used for scavenging to improve the recovery rate of fine particles, the sulfur concentrate is subjected to the dezincing operation, and the dezincing product is returned to the zinc rough separation operation, so that the recovery rate of zinc minerals is improved, and through the column machine combined with the middling regrinding mode, the recovery rates of lead and zinc in the complexly-embedded high-sulfur-content lead-zinc sulfide ore are improved.

The utility model discloses a coke oven gas organic sulfur detection device which comprises a gas input system, a chromatographic separation column, a gas supply system, a detection system and a trace sulfur analyzer connected with the detection system, the gas supply system is used for supplying hydrogen, nitrogen and oxygen, the gas input system is used for conveying detected gas to the chromatographic separation column, the detection system comprises a flame photometric detector, and the flame photometric detector is connected with the chromatographic separation column. According to the device for detecting the organic sulfur in the coke oven gas, the chromatographic separation column is combined with the flame photometric detector, so that the content of the organic sulfur in the coke oven gas can be quickly and accurately detected.

The invention discloses a treatment process and a treatment system for crystallization of photovoltaic wastewater calcium fluoride sludge, limestone particles and photovoltaic sludge are mixed according to a mass ratio of 3%-5% to obtain a homogeneous mixed material, the homogeneous mixed material is pre-dried and then fed into a rotary kiln, sintering is carried out at 1200-1500 DEG C for 1.5-3 hours, and the sintered material is cooled to room temperature. Calcium fluoride is attached to the surface of the silicate framework, sulfur trioxide and calcium oxide are released at the same time, after sintering is finished, the material is subjected to annealing treatment in a rotary kiln, calcium fluoride seed crystals accounting for 0.1%-1.0% of the total mass of the material are added, calcium fluoride crystals are induced to grow directionally and be repaired, and the calcium fluoride is obtained. According to the method, the purity of calcium fluoride is increased to 75%-85%, the sulfur content in the product can be controlled to be 0.1% or below, and the cold compressive strength of the pellets prepared from the product reaches 2.5 MPa or above.

The application discloses a LF refining method of 1.2312 die steel. The LF refining method of the 1.2312 die steel is provided, after complete reaction of deoxidization and desulfurization, the temperature of the molten steel is precisely calculated to 1620 DEG C by the relationship between total power consumption of the electric arc and the electric arc heating amount, and a calculated amount of ferrous sulfate is added to adjust the sulfur content in the molten steel, so that the purpose of precisely adjusting the sulfur content is achieved, the defect that the sulfur content is excessively adjusted by adding ferrous sulfate too early due to incomplete deoxidization and desulfurization reaction of the molten steel in the original smelting method is overcome, the subsequent sulfur content is reduced or increased, the expected effect is not achieved, the precise control of the sulfur content of the molten steel is realized, the manufacturing cost is reduced, and the smelting quality of the molten steel is improved.

This invention belongs to the field of petroleum processing technology, and specifically relates to a production apparatus and method for low-pour-point base oil for aviation hydraulic oil. The production apparatus and method for low-pour-point base oil for aviation hydraulic oil includes the following steps: Hydrorefining of the oil, where the feedstock oil undergoes hydrodesulfurization and dearomatization in a two-stage series process to produce hydrorefined oil with <1% aromatics and <1 mg / kg sulfur content; Fine fractionation of the oil, specifically: the hydrorefined oil is finely fractionated in a fractionation tower to obtain hydrorefined distillate oil at 230℃~280℃; Molecular sieve dewaxing, specifically: the 230℃~280℃ hydrorefined distillate oil is subjected to deep removal of n-alkanes using a 5A molecular sieve, lowering the oil's pour point to below -75℃, producing low-pour-point, low-aromatic aviation hydraulic oil base oil. This invention uses a combined process of "low-pressure hydrorefining-molecular sieve dewaxing" to produce a low-sulfur, low-aromatic, low-pour-point base oil with less than 1% aromatics. The production method has the advantages of low investment and ease of implementation.

The present invention provides line pipe steel comprising, by wt%, 0.04-0.07% of carbon (C), 0.20-0.30% of silicon (Si), 1.2-1.35% of manganese (Mn), 0.02-0.05% of aluminum (Al), 0.10% or less (excluding 0%) of copper (Cu), 0.15-0.25% of chromium (Cr), 0.02-0.08% of molybdenum (Mo), 0.15-0.25% of nickel (Ni), 0.04-0.05% of niobium (Nb), 0.01-0.018% of titanium (Ti), 0.025%-0.035% of vanadium (V), 0.01% or less (excluding 0%) of phosphorus (P), 0.001% or less (excluding 0%) of sulfur (S), 0.0005% or less (excluding 0%) of boron (B), and the balance of iron (Fe) and inevitable impurities, wherein the relative notch tensile strength (RNTS) according to ASTM G142 is 0.86 or greater.

The invention relates to a desulfurization method of oil shale residues, which comprises the following steps: step 1, crushing the oil shale residues at room temperature, and then carrying out ball milling on the oil shale residues in a ball mill to obtain refined particles; 2, carrying out heat preservation and desulfurization on the refined particles in a muffle furnace; 3, the desulfurized refined particles obtained in the step 2 are soaked in an alkaline solution, then neutralized with an acid solution and finally washed repeatedly with clear water; and 4, drying the refined particles obtained in the step 3. The desulfurization method provided by the invention can effectively reduce the content of sulfur element in the oil shale residues and reduce the harm of the oil shale residues to the environment; the invention further provides cement mortar prepared from the oil shale residues prepared by the desulfurization method, the cement mortar is higher in compressive strength and flexural strength, lower in porosity, higher in density and higher in applicability, the production cost is saved, and the environment-friendly concept of recycling solid waste is met.

A treatment composition for being added to petroleum based liquids for reducing total sulfur content in the petroleum based liquids, comprising: sodium sulfide and at least one hydroxide compound. A dosage of the treatment composition may be added to liquids containing sulfur, including crude oil and distillates of crude oil and then allowed to react with such liquids over a period of time, e.g., hours or days. By such reaction total sulfur content of the liquids may be reduced by more than 50%.

The present invention relates to a method of preparing a polymer film using chemical vapor deposition using sulfur as an initiator (sCVD) capable of manufacturing a polymer film through polymerization of sulfur and a monomer using gas-phase sulfur as an initiator. In the manufactured polymer film, any of various monomers and sulfur can be polymerized into a copolymer, and it is possible to manufacture a polymer film having a high content of sulfur, an excellent refractive index, and excellent transmittance.

The application relates to the technical field of ore dressing, and discloses a method for preparing ceramic tile glue raw materials from tungsten tailings, ceramic tile glue raw materials and ceramic tile glue. The method comprises the following steps: (1) preparing the tungsten tailings into ore slurry with a concentration of 10-20 wt%, and sequentially performing magnetic separation and concentration desliming on the ore slurry to obtain magnetic separation concentrate sand with a sand concentration of 25-35 wt%; (2) performing rough flotation of sulfur on the magnetic separation concentrate sand together with an adjusting agent, copper sulfate, a collecting agent I and 2# oil to obtain sulfur flotation tailings with a sulfur content of not more than 0.1 wt%; and (3) performing impurity removal flotation on the sulfur flotation tailings together with a collecting agent II to obtain impurity removal concentrate, and sequentially performing dehydration and drying on the impurity removal concentrate to obtain ceramic tile glue raw materials with a water content of not more than 0.5 wt%. By adopting the method, ceramic tile glue raw materials with a total sulfur content of less than 0.1 wt%, argillaceous mineral content and mica content of less than 1 wt% can be obtained.

The utility model discloses a device for measuring the dry slag rate of liquid reduced lead. The device comprises a sampling mechanism for sampling reduced lead liquid from a liquid lead bag, and an ingot casting mold for preparing the reduced lead liquid taken by the sampling mechanism into a lead ingot for measuring the oxygen content and the sulfur content so as to calculate the dry slag rate of the reduced lead, the sampling mechanism comprises a sampling rod, a sealing plug matched with the sampling rod for sampling, and a handle connected to the outer wall of the sampling rod; the top end of an inner hole of the sampling rod is in a circular truncated cone shape facilitating installation of the sealing plug. The lower part of the sealing plug is in a big-end-up circular truncated cone shape matched with the top end of the inner hole of the sampling rod; the ingot casting mold is in a hollow cylinder shape with a bottom, and the interior of the ingot casting mold is in a big-end-up circular truncated cone shape so that a circular truncated cone-shaped lead ingot can be cast. The dry slag rate measuring device is simple in structure, rapid in dry slag rate measurement and high in accuracy, solves the problems that a conventional wet lead dry slag rate measurement period is long, measured data are easy to interfere, and measured values have deviation, and can better guide adjustment in the production process.

Non-grain-oriented electrical steel sheet, having a thickness of 0.30 mm to 0.38 mm and a composition comprising the following elements, expressed as weight percent: 0.0001% ≤ Carbon ≤ 0.007% 0.09% ≤ Manganese ≤ 0.15% 2.6% ≤ Silicon ≤ 2.95% 0.1% ≤ Aluminum ≤ 0.5% Phosphorus ≤ 0.15% Sulfur ≤ 0.006% Nitrogen ≤ 0.09% 0% ≤ Tin ≤ 0.04% and may contain one or more of the following optional elements: 0% ≤ Niobium ≤ 0.1% 0% ≤ Titanium ≤ 0.1% 0% ≤ Vanadium ≤ 0.1% 0% ≤ Chromium ≤ 1% 0% ≤ Molybdenum ≤ 0.5% 0% ≤ Tungsten ≤ 0.1% 0% ≤ Cobalt ≤ 1% 0% ≤ Arsenic ≤ 0.05% 0.001% ≤ Calcium ≤ 0.01% 0% ≤ Copper ≤ 1% 0% ≤ Nickel ≤ 1% 0% ≤ Boron ≤ 0.05% 0% ≤ Lead ≤ 0.2% 0% ≤ Antimony ≤ 0.2% wherein the remaining composition consists of iron and unavoidable impurities caused by processing, wherein the microstructure of the steel sheet consists of ferrite, comprising 80% to 100% recrystallized microstructure and 0% to 20% non-recrystallized microstructure in area fractions, wherein the average grain size of the recrystallized microstructure is 20 to 110 micrometers, and exhibiting a percentage of eddy current losses in the total iron losses, measured at 1 T and 400 Hz according to standards IEC 60404-2, of 35% to 45%, calculated according to the Bertotti method.

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.

Diesel fuel and / or fuel blending compositions are provided that have improved emissions profiles by blending a narrow boiling range fraction of an alkylate product into the diesel fuel and / or fuel blending composition. The narrow boiling range alkylate fraction that is blended into the product has a reduced or minimized content of both light naphtha components and diesel boiling range components. As a result, the narrow boiling range alkylate fraction is a fraction that contains a substantial portion of C5 to C12 branched paraffin while generally having little or no aromatics content of aromatics as well as having a reduced or minimized sulfur content. Blending of the narrow boiling range alkylate fraction in diesel results in lower T10 values, lower T90 values, lower aromatic content, higher heating value, and a higher molar ratio of hydrogen to carbon as compared to conventional diesel.

The invention relates to the technical field of lead-zinc ore sulfur content determination, and discloses a method for determining the sulfur content in lead-zinc ore and concentrate. The method comprises the following steps: collecting physical and chemical attribute information of a lead-zinc ore or concentrate sample, wherein the information comprises sample quality, particle size distribution and element composition data; generating a fluxing agent proportioning scheme according to the physical and chemical attribute information, wherein the scheme defines the proportional relation of various fluxing agent components; mixing the sample and the fluxing agent according to the proportioning scheme, and putting the mixture into a combustion container; burning the mixture in a high-frequency induction heating mode to generate sulfur-containing gas; measuring a concentration signal of sulfur dioxide in the sulfur-containing gas by adopting an infrared absorption detection technology; and calculating the sulfur content value in the sample based on the concentration signal. According to the method, a fluxing scheme is formulated in combination with sample characteristics, efficient heating and specific detection are matched, the sulfur content is accurately analyzed, and the actual requirements of lead-zinc ore and concentrate detection scenes can be met.

The invention provides a chemical oxidation pretreatment agent system and a method for treating low-grade high-sulfur gold ore through the chemical oxidation pretreatment agent system, and belongs to the technical field of metal hydrometallurgy. According to the method, a pretreatment agent system is designed, and low-grade resources are economically and efficiently recycled by optimizing the whole technological process of sulfur separation enrichment, targeted pretreatment and concentrated leaching and key operation parameters. According to the method, firstly, high-sulfur ore is artificially divided into high-sulfur first-section gold concentrate and low-sulfur second-section gold concentrate through ore grinding and flotation, and most sulfide wrapping gold is concentrated in the high-sulfur first-section gold concentrate; and then, the high-sulfur first-stage gold concentrate is subjected to a pretreatment process, and the wrapping structure of sulfide on gold is deeply destroyed selectively through superfine grinding and a pretreatment agent, so that the subsequent cyanidation leaching rate is effectively increased. Through fine grinding, flotation and step-by-step pretreatment, the pretreatment amount and the total treatment amount in follow-up cyanidation leaching are reduced, and the overall energy consumption and cost of cyanidation leaching of the low-grade high-sulfur-content gold ore are reduced from the source.

The present application relates to the technical field of ore recovery, and particularly relates to a comprehensive recovery and utilization method of complex associated magnetite, which comprises a pretreatment stage, a sulfur tailing reinforced recovery and a desulfurization flotation operation. The magnetic roller separation device designed by the gradient magnetic field realizes effective separation of magnetic minerals and sulfur-containing minerals, and the two-stage wet magnetic separation equipment is used to improve the recovery rate of magnetic minerals, and then the sulfur content of the iron concentrate is reduced by optimizing the reagent adding mode and the flotation conditions. The present application can significantly reduce resource waste, reduce energy consumption and environmental pollution, and provides a green and efficient comprehensive recovery and utilization solution for complex associated magnetite.

The invention relates to the field of desulfurization control, in particular to a double-closed-loop intelligent collaborative desulfurization control method, which comprises the following steps: step 1, SO2 concentration outer-loop control: taking the SO2 concentration at an outlet as a core control target, collecting the SO2 concentration, the flue gas amount and the coal sulfur content of original flue gas in real time, and calculating the theoretical slurry supply amount; according to the technical scheme provided by the invention, the fluctuation range of the SO2 concentration at an outlet is reduced from + / -45 mg / m < 3 > to + / -6 mg / m < 3 >, the ultralow emission requirement (less than or equal to 35 mg / m < 3 >) is met, the limestone consumption is reduced by 13.6%, the content of CaCO3 in gypsum is less than or equal to 5.5%, and the cost of a desulfurizing agent is saved by more than 12 million yuan per year. When the load and the SO2 concentration change drastically, the response time is shortened from 8 minutes to 30 seconds, and manual intervention is not needed. The total power consumption is reduced by 24.2%, the slurry circulating pump saves electricity by 10.1%, and the annual electricity saving is more than 120 million kWh; the average time to failure (MTBF) of the system is increased to more than 8000 hours, and the non-planned shutdown rate is reduced to less than 0.3%.