649 results about "Sulfur containing" patented technology

A process system and process method for treating hydrogen sulfide-containing acid gas. The process system comprises a sulfur recovery unit, a tail gas treatment unit having an acid gas concentration function, and a flue gas alkaline scrubbing unit. The method comprises: subjecting sulfur-containing tail gas to concentration treatment by means of an absorption column (1) of the tail gas treatment unit, and then introducing same into the sulfur recovery unit to undergo a Claus reaction for separation, so as to obtain sulfur and sulfur recovery tail gas; introducing the sulfur recovery tail gas into the tail gas treatment unit, successively carrying out combustion and hydrotreating, and introducing the obtained gas into the absorption column (1) of the tail gas treatment unit; and in the tail gas treatment unit, introducing gas absorbed by the absorption column (1) into the flue gas alkaline scrubbing unit, and successively carrying out incineration and alkaline scrubbing, so as to discharge desulfurized gas. The content of SO2 in the tail gas treated by the process system is ≤50 mg / Nm3, and the requirements for full-period standard reaching of sulfur dioxide emission of tail gas during startup, shutdown and normal operations can be satisfied.

The invention provides a method for identifying natural gas causes of a high-sulfur-content gas reservoir and application. The method comprises the following steps: S1, measuring carbon and hydrogen isotope and component data of high-sulfur-content natural gas of a research target layer and data of potential hydrocarbon source rock kerogen isotope and vitrinite reflectivity; s2, carrying out a natural gas sulfate thermochemical reduction reaction simulation experiment, and determining influence factors of the sulfate thermochemical reduction reaction on carbon and hydrogen isotopes and components of natural gas isotopes; s3, carrying out a potential hydrocarbon source rock hydrocarbon generation simulation experiment, and determining the influence of the hydrocarbon source rock thermal maturity on natural gas carbon and hydrogen isotopes and natural gas components; s4, selecting methane carbon and hydrogen isotopes of the natural gas as identification parameters according to the result, and establishing an identification chart of the gas source cause of the high-sulfur-content natural gas; and S5, substituting the measured carbon and hydrogen isotope values of the high-sulfur-content natural gas into the high-sulfur-content natural gas source cause judgment chart, and determining the cause and thermal evolution maturity of the high-sulfur-content natural gas sample.

The invention belongs to the technical field of activated carbon preparation, and relates to sulfur-doped activated carbon and a preparation method thereof. The method comprises the following steps: firstly, adding a cleaned and crushed biomass raw material into an aqueous solution of a sulfur-containing dopant, carrying out dipping treatment, separating, drying, and carrying out high-temperature carbonization in an oxygen-free environment to obtain a sulfur-doped carbonized material; and crushing the sulfur-doped carbonized material into particles, and activating at high temperature in a carbon dioxide atmosphere to obtain the sulfur-doped activated carbon particles. The sulfur-doped active carbon particles prepared by utilizing a sulfur in-situ doping and physical activation combined method are stable in structure, the active carbon with rich mesopore and micropore structures can be obtained by doping a small amount of sulfur, the surface hydrophobicity of the active carbon is improved, meanwhile, the adsorption sites on the surface are increased, and the adsorption performance on hydrophobic organic pollutants is remarkably improved. The method is simple in process, low in cost, environment-friendly and easy for commercialized application.

The invention discloses a gas-sensitive material based on double noble metal doped holmium iron oxide and application of the gas-sensitive material to detection of hydrogen sulfide in a sulfur-containing ore body exploration environment, and relates to the technical field of gas-sensitive materials. HoFeO3 is used as a substrate material, and two elements of Au and Pt are used for doping modification of the HoFeO3 to prepare the gas sensitive material based on double noble metal doped holmium iron oxide. Au and Pt are combined to perform doping modification on HoFeO3, a synergistic effect is achieved on improving the temperature stability of the gas-sensitive material, the sensitivity of the gas-sensitive material in a high-humidity environment can be improved, in addition, due to the synergistic catalysis effect of Au and Pt, an energy barrier of H2S adsorption reaction can be remarkably reduced, surface electron transfer and reaction activity are promoted, and the sensitivity of the gas-sensitive material in a high-humidity environment is improved. Therefore, the working temperature is reduced, the response value is improved, and the method is suitable for detecting hydrogen sulfide gas in a sulfur ore body exploration environment.

The invention relates to a method for preparing sponge iron from laterite-nickel ore hydrometallurgy tailings, which comprises the following steps: (1) carrying out acid leaching on laterite-nickel ore hydrometallurgy tailings to obtain leached residues without at least part of CaSO4; (2) oxidizing and roasting the leaching residues obtained in the step (1), so that at least part of sulfate is discharged as sulfur-containing gas; performing hydrogen reduction to obtain a reduced material; and (3) the reduction material in the step (2) is sequentially subjected to ore grinding and magnetic separation, and the sponge iron with the Fe content being 90 wt% or above and the S content being 0.01 wt% or below is obtained. According to the method, iron resources in the laterite-nickel ore hydrometallurgy tailings are recycled, desulfurization and reduction are carried out step by step, the desulfurization efficiency is improved, the reduction temperature is reduced, and the sponge iron with the Fe content being 90 wt% or above and the S content being 0.01 wt% or below is obtained.

The invention relates to a surfactant oil displacement composition suitable for a high-temperature and high-salt oil reservoir and application of the surfactant oil displacement composition. The surfactant oil displacement composition comprises the following components in percentage by mass: 0.10-0.50 wt% of a nitrogen-containing surfactant, less than 0.12 wt% of a sulfur-containing surfactant or hydrophobic salt and the balance of water. The surfactant oil displacement composition stably exists under the conditions that the temperature is 70-130 DEG C, the total mineralization degree of formation water is (10-25) * 10 < 4 > mg / L, and the concentration of calcium and magnesium ions is (1-2.5) * 10 < 4 > mg / L, and is kept clear without forming precipitates. The interfacial tension of the surfactant oil displacement composition can reach 10 <-2 > mN / m order of magnitude under high-temperature and high-salt conditions, the oil washing efficiency can reach 80% or above, and the surfactant oil displacement composition is suitable for improving the recovery efficiency of a high-temperature and high-salt oil reservoir in tertiary oil recovery.

The present invention provides a ship exhaust gas desulfurization device and a desulfurization method, which include a sulfur-containing ship exhaust gas pretreatment system, a seawater pretreatment system, a membrane contactor, and a seawater post-treatment system; the outlet end of the sulfur-containing ship exhaust gas pretreatment system is connected to the shell-side inlet end of the membrane contactor for sending the dust- and oil-removed exhaust gas into the shell side of the membrane contactor; the outlet end of the seawater pretreatment system is connected to the tube-side inlet end of the membrane contactor for sending the pretreated seawater into the tube side of the membrane contactor; the membrane contactor is a membrane contactor filled with polytetrafluoroethylene hollow fiber hydrophobic microporous membranes; the inlet end of the seawater post-treatment system is connected to the tube-side outlet end of the membrane contactor for post-treating the seawater after absorbing sulfur dioxide and oxidizing sulfite into sulfate. The ship exhaust gas desulfurization device described in the present invention has a high integration degree, a compact volume, and a high desulfurization efficiency, can achieve efficient desulfurization of ship exhaust gas, and has good application prospects.

The invention discloses a pretreatment method and system for sulfur-containing and arsenic-containing ore. The method comprises the steps of crushing, alkaline wet ore grinding, strong alkaline pre-oxidation, cyanidation leaching, cyanogen removal treatment and high alkaline flotation. In the pretreatment process, liquid caustic soda is added into an ore grinding system, and oxygen is introduced into a cyanidation serial stirring tank for pre-oxidation treatment, so that the oxidation activation effect of the arsenic-sulfur minerals is remarkably enhanced, and the gold release efficiency and the cyanidation leaching rate are improved. The same group of serially connected stirring tanks is adopted for pre-oxidation and cyanidation leaching, and the first three stirring tanks are used for pre-oxidation and subsequently communicated with the stirring tanks for cyanidation reaction, so that process integration and equipment reuse are realized. Experimental results show that the comprehensive recovery rate of gold can be remarkably increased, the agent consumption can be reduced, and the method has good industrial application value.

The invention discloses a high-sulfur-content natural gas elbow sulfur particle deposition simulation experiment device and a testing method, and relates to the technical field of high-sulfur-content natural gas gathering and transportation pipeline sulfur particle dynamic deposition. The sulfur particle deposition simulation experiment device for the high-sulfur-content natural gas pipeline can simulate the dynamic deposition process of sulfur particles under various working conditions such as different flow rates of the sulfur particles, different flow rates of gas, different particle sizes of the sulfur particles, different pipeline pressures, different pipe bending angles and different pipe bending materials; through the two-stage recovery and two-stage purification scheme of the activated carbon adsorption device, the cloth bag dust collector and the secondary filter screen, the sulfur particle recovery rate is highly reliable, and the danger to the environment and testers is remarkably reduced; and through the coupling design of the micro vibrator and the sulfur particle injection device, the problem of blockage caused by sulfur particle agglomeration is effectively solved, and the manual intervention frequency is reduced.

The invention discloses a dynamic early warning method for a high-sulfur-content natural gas leakage influence range in the field of leakage gas monitoring. The method comprises the following steps: arranging an intermediate infrared laser remote measurement system in a high-sulfur-content natural gas field to monitor the concentration of hydrogen sulfide gas in the gas field in real time; judging whether the gas field is leaked or not according to the concentration of the hydrogen sulfide gas, if so, executing the next step, otherwise, repeating the judgment; calculating leakage flow and leakage hole radius; and substituting the leakage hole radius and the leakage flow into the optimized time sequence Gaussian smoke cloud model to obtain the concentration values of the hydrogen sulfide gas at different moments and different spatial positions, namely the influence ranges of the leakage gas at different moments. According to the method, the size of the leakage hole can be calculated, the dynamic correction process of the three-dimensional leakage range of the Gaussian model is completed, various conditions of mixed gas leakage factors are considered at the same time, and the dynamic calculation process of the influence range of the leakage gas is achieved.

The invention discloses a sulfur-containing magnetite beneficiation method which specifically comprises the following steps: S1, raw material preparation: crushing sulfur-containing magnetite to obtain small-particle sulfur-containing magnetite; s2, physicochemical property determination: detecting the particle size of the small-particle sulfur-containing magnetite, the content of magnetite in the small-particle sulfur-containing magnetite and the content of sulfur minerals in the small-particle sulfur-containing magnetite; s3, magnetic separation: according to the physicochemical properties of the small-particle sulfur-containing magnetite detected in the step S2, automatically controlling the magnetic field intensity of a magnetic separation process through a controller, and carrying out magnetic separation to obtain magnetite and sulfur-containing ore; the magnetic field intensity of the magnetic separation process is dynamically adjusted according to the iron ore particle size of the sulfur-containing magnetite, the magnetite content in the sulfur-containing magnetite and the sulfur mineral content, the trends of iron minerals and sulfur minerals are accurately controlled, optimal adjustment of the element trends is achieved, and the recovery rate of iron and sulfur is increased.

The invention discloses a method for efficient photo-thermal catalytic degradation of sulfur-containing organic gas. A preparation method of a sulfur-resistant catalyst comprises the following steps: (1) salt containing sulfur-resistant active metal A and an accelerant are added into water to obtain a salt solution of the active metal A, and the active metal A is selected from more than one of Fe, Co, Cu, Mn, Ni, Pt and Sr; (2) adding a salt solution containing an active phase metal B into the carbon dioxide nanotube, carrying out vacuum-assisted confinement, drying and reducing to obtain an active phase material for degrading the sulfur-containing organic gas in the confinement of the titanium dioxide nanotube, the active phase metal B being selected from more than one of Fe, Co, Cu, Mn, Ni, Pt and Sr; and (3) adding the active phase material of the titanium dioxide nanotube for confinement degradation of the sulfur-containing organic gas into the salt solution of the active metal A for coupling to obtain the sulfur-resistant catalyst. According to the method provided by the invention, the catalyst shows excellent catalytic performance in light and heat catalytic systems.

The invention relates to a method for removing sulfur in sulfur-containing sludge. The method comprises the following specific steps: S1, calcining the sulfur-containing sludge at high temperature; s2, mixing the high-temperature calcined sulfur-containing sludge obtained in the step S1 with a sodium chloride solution, and performing wet ball milling to obtain mixed slurry; s3, filtering the mixed slurry obtained in the step S2, and carrying out solid-liquid separation to obtain a solid phase and a liquid phase; s4, an acid leaching reagent is added into the solid phase obtained in the step S3 for acid leaching, and an acid leaching solution is obtained; and S5, carrying out solid-liquid separation on the acid leaching solution obtained in the step S4 to obtain a solid phase and a liquid phase, and washing and drying the solid phase to obtain sulfur-removed sludge. Compared with the prior art, the method is different from a single ion regulation and control technology through a salt dissolution effect mechanism, so that impurities are more effectively removed.

The invention discloses a low-temperature-bending-resistant sulfur-free fireproof coating for packaging aerogel felt and a preparation method thereof. The coating comprises the following components in parts by weight: 35-50 parts of sulfur-free resin, 20-45 parts of pigment paste, 0-20 parts of a flame retardant, 0.1-2 parts of a defoaming agent, 0.1-2 parts of a substrate wetting agent, 0.5-2 parts of a thickening agent, 0-10 parts of an anti-freezing agent and 0-10 parts of a plasticizer. According to the invention, the sulfur content of the resin, the pigment and the additive adopted by the coating is measured, and the resin with the sulfur content not detected in the test result is selected to design the formula of the sulfur-free coating, so that the sulfur-free coating which passes a dryness test and a low-temperature flexibility test is obtained and can be applied to aerogel felt packaging. Furthermore, by adding a specific flame retardant, the fireproof performance (grade to 1-5) and good heat insulation performance can be achieved at the same time.

A method for applying a scavenger material to a wellbore includes providing a precursor scavenger material to a location within a wellbore extending through an earth formation, the precursor scavenger material comprising an acetal or a hydroxyaldehyde, reacting the precursor scavenger material in the wellbore or the earth formation in-situ to form a scavenger material comprising propenal, and reacting the scavenger material with at least one of hydrogen sulfide or a mercaptan to reduce a concentration of the at least one of hydrogen sulfide or the mercaptan. Related methods and systems for applying the scavenger material to the wellbore are also disclosed.

The invention discloses a three-dimensional porous sulfur-doped tin-antimony-nickel electrode and a preparation method and application thereof.The specific operation process includes the steps that a carrier is pretreated, the titanium carrier is used as a substrate, a sulfur-containing surfactant and tin-antimony-nickel metal salt are used as precursors, absolute ethyl alcohol and hydrochloric acid are used as solvents, and the three-dimensional porous sulfur-doped tin-antimony-nickel electrode is obtained; loading a sulfur-containing nanoparticle precursor material on the surface of the titanium carrier through a hydrothermal method; and drying the hydrothermal precursor material, and roasting in a muffle furnace to finally obtain the three-dimensional porous sulfur-doped tin-antimony-nickel-titanium substrate electrode. The catalyst disclosed by the invention has a three-dimensional porous spherical structure, the active specific surface area is obviously increased, the path of diffusing reactants to active sites is effectively shortened, the mass transfer resistance is reduced, the transfer of electrons and protons is promoted, and the reaction performance is improved. Sulfur doping not only improves the electrochemical reaction rate, conductivity and stability, but also shows high activity and high Faraday efficiency in electrocatalytic ozone production and chlorine evolution reactions.

The invention belongs to the technical field of oil and gas measurement, and discloses an experimental method and device for obtaining a compression factor of high-sulfur-content natural gas, and the method comprises the following steps: mixing purified natural gas and hydrogen sulfide through a checking system according to gas component parameters of a high-sulfur-content natural gas site to obtain sulfur-containing natural gas; determining the molar mass, the mass flow rate and the volume flow rate of the sulfur-containing natural gas through a standard measurement system; according to the flow value and the pressure value of the purified natural gas measured by the checking system and the volume flow of the hydrogen sulfide, whether the mass flow of the sulfur-containing natural gas measured by the standard measurement system is accurate is determined; and if so, determining the compression factor of the sulfur-containing natural gas according to the gas molar mass, mass flow and volume flow of the sulfur-containing natural gas. The device can simulate working conditions of a high-sulfur-content field, configure gas components consistent with the field conditions and determine the compression factor of gas at a standard detection system, and is clear in overall measurement principle, simple in system and easy to maintain.

The invention relates to the field of sulfur-containing waste treatment, and discloses a method and a system for recovering sulfur element in sulfur-containing waste, and the method comprises the following steps: firstly, decomposing the sulfur-containing waste into first process gas containing sulfur dioxide; carrying out a first catalytic oxidation reaction on the first process gas, and condensing to obtain a second process gas; performing a second catalytic oxidation reaction on the second process gas, and condensing to discharge tail gas to be treated; according to the method, sulfur-containing waste is decomposed into gas containing sulfur dioxide through the reaction furnace, sulfur dioxide is catalytically oxidized into sulfur trioxide through the reaction tower, sulfur trioxide is condensed into concentrated sulfuric acid through the condensing tower, and the sulfur element recovery liquid is obtained. The sulfur-containing waste is decomposed into process gas containing sulfur dioxide in the reaction furnace, and the recovery rate of the sulfur element is not lower than 99% through two times of catalytic oxidation and two times of condensation.

The invention relates to the field of industrial wastewater treatment, in particular to an oxidation flocculation treatment system for sulfur-containing wastewater in mancozeb production. The system comprises a parameter acquisition module, a loss evaluation module, a boundary prediction module, a strategy selection module and a dynamic execution module. The system performs feature extraction in combination with the multi-dimensional state parameters of the fluid, and quantifies the buffer capacity loss degree of the sulfur-containing wastewater by using a mapping model; the method is characterized in that the speed of approaching a system failure boundary is predicted based on loss degree change, a fluid regulation and control strategy is generated in combination with a dangerous threshold value, and an oxidizing agent and / or a flocculating agent are / is dynamically controlled to be added for fluid state reconstruction; according to the method, the traditional passive dosing depending on a single instantaneous index is abandoned, a control object is expanded to hidden system buffer toughness, colloidal sulfur enrichment is recognized in advance and other potential risks, the hysteresis defect of a conventional sensor is overcome, prospective early warning is realized, and sludge floating and harmful gas dissipation are effectively avoided.

The invention relates to the technical field of concentrated sulfuric acid production, and particularly discloses a sulfuric acid thickening device which comprises a waste acid regeneration unit for burning sulfur-containing waste acid and acid gas to produce sulfuric acid and a sulfuric acid thickening unit for thickening the sulfuric acid generated by the waste acid regeneration unit, the sulfuric acid thickening unit comprises a combustion chamber, and liquid sulfur is combusted in the combustion chamber to generate sulfur dioxide. A steam generating device is arranged in the combustion chamber, the combustion chamber is connected with the reactor through a process gas conveying pipe, sulfur dioxide is subjected to a catalytic reaction in the reactor to generate sulfur trioxide, and the reactor is connected with the absorption tower through a process gas discharging pipe; unqualified sulfuric acid and reflux sulfuric acid in the waste acid regeneration unit absorb sulfur trioxide in an absorption tower to generate sulfuric acid, and the sulfuric acid is thickened; the invention also provides a method for producing concentrated sulfuric acid by using the device. According to the device, sulfuric acid with the concentration lower than 98wt% can be prepared into concentrated sulfuric acid with the concentration higher than 98wt%, the product income is increased, meanwhile, steam is generated as a byproduct, and the benefits of the device are increased.

The invention relates to a pipeline integrity analysis technology, and discloses a method for determining the integrity of an extra-high sulfur-containing production device, which comprises the following steps of: acquiring acquired data of the extra-high sulfur-containing production device, and extracting safety risk factors from the acquired data; according to the safety risk factors, the integrity of the ultrahigh-sulfur-content production device is predicted through a pre-constructed integrity prediction model, an integrity prediction result is obtained, the pre-constructed integrity prediction model comprises a flow erosion model, a corrosion prediction model, a rigidity and strength prediction model and a sealing life prediction model, and the flow erosion model, the corrosion prediction model, the rigidity and strength prediction model and the sealing life prediction model are used for prediction of the integrity of the ultrahigh-sulfur-content production device. The integrity prediction result is obtained by fusing an output result of the flow erosion model, an output result of the corrosion prediction model, an output result of the rigidity and strength prediction model and an output result of the sealing life prediction model. The invention further provides a digital intelligent cloud platform, equipment and a storage medium. The method can improve the prediction accuracy and efficiency of the integrity of the extra-high sulfur-containing production device.

The utility model discloses a sulfur-containing gas field produced water gas stripping integrated device which comprises a gas field water pump and a gas stripping tower which are connected with each other, a water inlet which is used for introducing gas field gas and is connected with an outlet of the gas field water pump is arranged at the upper part of the gas stripping tower, and a gas stripping nitrogen gas incoming line pipe which is connected with an air nitrogen station system is arranged at the lower part of the gas stripping tower; a gas stripping gas outlet pipeline connected with a purification station sulfur recovery unit is arranged at the top of the gas stripping tower, a gas field water output pipeline connected with a sewage treatment device is arranged at the bottom of the gas stripping tower, and the underground gas field water tank introduces gas field water from the separator through a gas field water inlet pipeline; a first outlet in the top of the underground gas field water tank is connected with an inlet of the gas field water pump through an acid water pipe, and a flash evaporation mechanism is arranged in the underground gas field water tank and connected with a second outlet of the underground gas field water tank and a gas stripping gas outlet pipeline. The device has the advantages of good desulfurization effect, factory prefabrication and convenience in site construction, and can be widely applied to the technical field of desulfurization.

A combined beneficiation method for low-grade, high-mud-content and fine-grained tin tailings, comprising the following steps: (1) gravity pre-enrichment: preparing a pulp from raw ore having a particle size of -0.074 mm, and then using a suspended vibration concentrator to perform primary roughing pre-enrichment on the obtained ore pulp to obtain a pre-enriched product; (2) desulfurization flotation: concentrating and dehydrating the pre-enriched product, and if the pre-enriched product contains sulfur, performing desulfurization flotation, wherein the desulfurization flotation comprises roughing, scavenging and concentration, and if the pre-enriched product does not contain sulfur, directly entering step (3); (3) cassiterite flotation: performing cassiterite flotation on the sulfur-free pre-enriched product or desulfurized product in step (2), wherein the cassiterite flotation comprises roughing, scavenging and concentration; and (4) gravity concentration: using a gravity concentrator to separate the finally concentrated product in the cassiterite flotation in step (3) to obtain high-grade tin concentrate and low-grade tin concentrate. The beneficiation method has the advantages of reducing the costs, and improving the beneficiation recovery rate and the product quality.

The invention relates to a catalyst for removing CO in sulfur-containing sintering flue gas and a preparation method thereof. The preparation method comprises the following steps: sulfur-resistant treatment: soaking TiO2 in concentrated sulfuric acid for 12-24 hours, treating for 5-10 minutes under the microwave power of 300-500W, treating for 5-10 minutes under the microwave power of 500-700W, treating for 2-5 minutes under the microwave power of 700-800W, washing and drying; co-impregnation: adding the TiO2 carrier into a mixed solution containing a Pt precursor, a La precursor and a Ce precursor, and carrying out ultrasonic auxiliary impregnation for 1-3 hours; and drying and roasting: drying the impregnated product at 80-120 DEG C for 4-12 hours, and roasting at 400-600 DEG C for 2-4 hours. The catalyst prepared by the method has the advantages of high specific surface area, stable surface sulfur and high utilization rate of active components, and can realize efficient oxidation removal of CO in sulfur-containing sintering flue gas.

The invention discloses a sulfur-containing waste gas and waste liquid treatment method and equipment, and particularly relates to the technical field of sulfur-containing waste gas and waste liquid treatment.The sulfur-containing waste gas and waste liquid treatment method is characterized in that a cracking incineration unit, a catalytic oxidation unit, a condensation and concentration unit and a tail gas purification unit are included; sulfur-containing waste gas and waste liquid are sequentially cracked and incinerated into sulfur dioxide, then converted into sulfur trioxide and condensed to form sulfuric acid, sulfur dioxide in tail gas is converted and washed to form dilute acid, sulfuric acid trioxide mist in the tail gas is removed under the action of a high-voltage electric field, and the tail gas is discharged from a chimney. And the effects of ultra-clean emission and high total sulfur recovery rate are achieved under the condition of meeting tail gas emission indexes.

This disclosure relates to methods of determining the sulfur-content in a gas sample or liquefied petroleum gas sample comprising sulfur-containing compounds, including derivatizing the sulfur-containing compounds and analyzing the derivatized sulfur-containing compounds.

This invention discloses an S-type heterojunction photocatalyst composed of sulfur-defect-containing indium zinc sulfide and tungsten oxide, its preparation method, and its application. Specifically, this invention involves preparing WO3 nanosheets via a hydrothermal method, then loading them onto the surface of Zn3In2S6 using a solvothermal method, followed by introducing sulfur defects through phototreatment to obtain the S-type heterojunction photocatalyst WO3 / V. S -Zn3In2S6. The S-type heterojunction photocatalyst WO3 / V obtained in this invention. S -Zn3In2S6 exhibits excellent activity, enhanced CH4 selectivity, and good stability in the photocatalytic CO2 reduction reaction. Its preparation method is simple and easy, and it has good application prospects in the photocatalytic CO2 reduction reaction.

The invention relates to a method for firing calcium sulphoaluminate-containing cement by using ferrous metallurgy dust, and belongs to the technical field of Portland cement preparation. According to the method, limestone slag, siliceous slag, basalt slag and ferrous metallurgy dust are used as raw materials, the ZnO content (0.10%-0.25%) and mineral composition (KH is equal to 0.88-0.92, SM is equal to 1.7-2.7, and IM is equal to 0.8-1.7) in the raw materials are controlled, and clinker is fired at the low temperature of 950-1300 DEG C. Through the synergistic effect of ZnO, CaF and sulfide in the dust, the firing temperature of the clinker is reduced, the absorption of CaO is promoted, the coexistence of CS and CA6S minerals is realized, and the obtained cement is high in early strength, slight in expansion, high in erosion resistance and capable of being constructed in winter.

The high-efficiency biological treatment method comprises the following steps: (1) conveying the high-concentration sulfur-containing waste gas to a gas inlet at the bottom of a biological washing tank through an exhaust fan, uniformly distributing the high-concentration sulfur-containing waste gas through a perforated aeration pipe, entering the bottom of the biological washing tank, and penetrating through a biological washing solution from bottom to top in a bubble form, so that the high-concentration sulfur-containing waste gas enters the bottom of the biological washing tank; most H2S in the bubbles is firstly adsorbed by the activated sludge and then is gradually biodegraded; (2) residual H2S continuously rises in the biological washing liquid along with bubbles and enters a three-phase separator, the bubbles are broken, the waste gas is separated from the biological washing liquid and activated sludge, the residual H2S continuously ascends to enter a combiner box to be mixed with air / low-concentration waste gas and then enters the bottom of a biological filtering tank, and the waste gas penetrates through a biological filtering filler layer from bottom to top and is separated from the biological washing liquid; the purified gas is discharged to the ambient atmosphere from a gas outlet in the top of the biological tower. According to the method and the device, low-cost and high-efficiency operation can be realized, elemental sulfur recovery is realized, emission of biodegradable products is promoted, and resource reutilization is realized.

The invention discloses a method for evaluating the machinability of sulfur-containing free-cutting steel. The method comprises the following steps: (1) testing the hardness of a section; (2) assigning hardness test data; (3) grade evaluation of sulfide inclusions; and (4) comprehensive assignment calculation is conducted, specifically, the product of the hardness absolute value grade assignment, the hardness standard deviation grade assignment and the sulfide inclusion grade assignment serves as the comprehensive assignment, the turning performance of the materials is sequenced according to the comprehensive assignment, and the smaller the comprehensive assignment is, the easier machining is. According to the evaluation method disclosed by the invention, before the sulfur-containing free-cutting cold-drawing bar is cut, the machinability of the bar is visually evaluated by detecting the hardness, the uniformity of the hardness and the distribution pattern of non-metallic inclusions and through assignment calculation, so that bar processing enterprises can be helped to estimate the processing efficiency and calculate the cost, and the processing efficiency of the bars is improved. And a guiding effect is achieved on enterprise production and operation.