930 results about "Sulfur oxide" 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 belongs to the technical field of adsorbent preparation, and relates to a preparation method of a series of M-TCBB metal organic framework materials and application of the M-TCBB metal organic framework materials to adsorption of sulfur dioxide and ammonia gas. The preparation method comprises the following steps: dispersing [9, 9 '-dicarbazole]-3, 3', 6, 6 '-tetracarboxylic acid (H4TCBB) serving as an organic ligand and any one or more of yttrium salt, zirconium salt, hafnium salt, cerium salt and thorium salt in a solution according to a certain mass ratio, and carrying out solvothermal reaction at 100-120 DEG C; and after the reaction is finished, centrifuging to take a precipitate, washing and drying to obtain a series of M-TCBB metal organic framework materials. The series of M-TCBB metal organic framework materials prepared by the invention have relatively good adsorption acting force on sulfur dioxide and ammonia gas, and are high in adsorption cycle stability; under a humid condition, capture of sulfur dioxide and ammonia gas shows a humidity enhancement characteristic, namely, water vapor promotes enhancement of the adsorption capacity of sulfur dioxide and ammonia gas.

The invention discloses a flue gas sulfur dioxide concentration prediction method based on variational mode decomposition and integrated learning, which comprises the following steps: for a flue gas SO2 concentration sequence collected in a flue gas desulfurization system, firstly decomposing the time sequence into a plurality of internal mode functions by using a variational mode decomposition method; then, a feedforward cascade neural network, a long short-term memory network and an autoregressive integral moving average model are used as base learners, and the dynamic characteristics of each modal function are learned; and finally, training element learners based on prediction results of all the base learners, and establishing an integrated model of each modal function. And recombining the predicted values of all the integrated models to realize the prediction of the SO2 concentration of the discharged flue gas. Accurate prediction of sulfur dioxide in discharged flue gas is beneficial to reduction of air pollution, prevention of formation of acid rain and protection of an ecological system and biological diversity. By adopting emission reduction measures and optimizing the production process in advance, enterprises can reduce the environmental protection treatment cost and improve the green production level.

The invention relates to the field of environment restoration, and discloses a semi-coke ecological system environment restoration method which comprises the following steps: waste gas treatment: treating sulfur-containing gas, nitric oxide and particulate matters generated in semi-coke production by adopting a multi-stage gas purification device, and further purifying residual harmful substances by adopting a low-temperature plasma technology; wastewater treatment: carrying out multi-stage purification on industrial wastewater generated in semi-coke production through physical filtration, chemical precipitation and biological treatment, and carrying out advanced treatment on the wastewater in combination with a membrane separation technology; and solid waste treatment: carrying out high-temperature gasification treatment on solid wastes generated in semi-coke production, recovering energy and using residues for regenerated material production. The comprehensive treatment of various pollutants generated in the production process is realized through the technologies of multi-stage waste gas purification, waste water deep treatment and solid waste resource utilization, and the removal efficiency of sulfur oxides and nitrogen oxides is remarkably improved by the waste gas treatment system through the combination of wet desulfurization and dry desulfurization.

The invention discloses an instrument for detecting sulfur dioxide residue in traditional Chinese medicine, and relates to the technical field of traditional Chinese medicine detection, the instrument comprises a main machine, and also comprises a distillation flask arranged at the top of the main machine and used for containing a sample to be detected; the condensation assembly is arranged at the top of the distillation flask and comprises a condensation pipe and a sleeve, and the sleeve is fixedly arranged in the condensation pipe and divides the condensation pipe into a water passing cavity and a condensation cavity. The condensation cavity is divided into the upper condensation section and the lower condensation section through the separation part, heat can be effectively prevented from spreading to the whole condensation cavity, a certain temperature difference is kept between the upper condensation section and the lower condensation section, it is ensured that gas subjected to primary condensation can be effectively condensed on the upper condensation section, and therefore the condensation effect on distilled gas is improved; the hydrochloric acid component doped in the gas can be further reduced through twice condensation, the hydrochloric acid component is prevented from entering the absorption bottle along with nitrogen and sulfur dioxide to influence the absorption liquid, and the detection accuracy is improved.

The invention discloses a preparation device and a preparation method of electronic-grade sulfuric acid. The device mainly comprises a sulfuric acid storage tank, a wiped-film evaporator, a liquid storage tank, a sulfur trioxide absorption tank, a packing absorption tower, a heat exchanger, a filter and the like. A fuming sulfuric acid storage tank is conveyed to a wiped-film evaporator through a diaphragm pump to evaporate sulfur trioxide, the evaporated sulfur trioxide is subjected to circular absorption reaction to generate sulfuric acid, and electronic-grade sulfuric acid is obtained after filtration. The method is simple in technological process, low in evaporation process temperature, high in efficiency and low in metal residue, and high-quality electronic-grade sulfuric acid is obtained.

The invention relates to the technical field of coal-fired power plant environmental protection, in particular to a coal-fired power plant intelligent environmental protection island control system based on multi-source data fusion. Comprising a multi-source data acquisition module, a data transmission module, a data preprocessing module, a multi-source data fusion module, an operation state analysis module, an intelligent control decision module, a control instruction execution module and a man-machine interaction module. According to the coal-fired power plant intelligent environmental protection island control system based on multi-source data fusion, equipment operation, environmental monitoring, power grid, fuel and meteorological data are widely acquired through the multi-source data acquisition module, the limitation of a single data source of a traditional system is broken through, a distributed Kalman filtering algorithm is combined with a neural network algorithm for data fusion, and the data fusion efficiency is improved. According to the method, the incidence relation between data can be deeply mined, temperature and pressure parameters of desulfurization equipment and flue gas sulfur dioxide concentration data are subjected to fusion analysis, the reason of desulfurization efficiency reduction can be accurately positioned, and compared with traditional single data source judgment, the fault diagnosis accuracy is improved.

The invention relates to the technical field of waste gas treatment, in particular to a heat supply plant boiler flue gas desulfurization device which comprises a desulfurization tower, a gas inlet is formed in one side of the bottom of the desulfurization tower, a gas outlet is formed in the top of the desulfurization tower, and the heat supply plant boiler flue gas desulfurization device further comprises a fixing frame fixedly arranged on the inner side of the desulfurization tower; the constant-speed spraying units are rotationally arranged on the fixing frame, and a speed reducing mechanism is arranged between every two adjacent constant-speed spraying units; the driving assembly is arranged on the fixed frame and is used for driving the constant-speed spraying unit to rotate in the desulfurizing tower; the gas distribution assembly is arranged at the bottom of the fixing frame and can uniformly disperse flue gas introduced from the gas inlet into the desulfurization tower, according to the boiler flue gas desulfurization device for the heat supply plant, through the designed gas distribution assembly and the constant-speed spraying unit, the flue gas can be uniformly distributed in the desulfurization tower and is fully mixed and reacted with alkali liquor, so that an efficient desulfurization effect is achieved, and the desulfurization efficiency is improved. The content of sulfur oxides in the flue gas is greatly reduced, and the environmental protection requirement is met.

The invention discloses a method for preparing high-purity manganese sulfate and co-producing manganese dioxide for a battery by reducing manganese oxide ore with sulfur dioxide, metal smelting SO2-containing flue gas or sulfur acid-making industry SO2 gas is used as a reducing agent, discharged tail gas after absorption can be as low as 30 mg / m < 3 > or below, and the leaching rate of manganese element can reach 98% or above. By adopting the technical scheme of the process, the comprehensive recovery rate of manganese is easy to achieve more than 95%, and two high-value products of high-purity MnSO4 and MnO2 for batteries are produced; s2O6 < 2-> is decomposed and removed in the same reaction kettle by adopting a high-temperature oxidation process to obtain a manganese sulfate solution and co-produce a high-quality MnO2 product suitable for batteries; a speed-controlled crystallization method is adopted for high-temperature crystallization, the one-time crystallization separation and purification rate of impurity ions such as magnesium, calcium, potassium and sodium is stably increased from 70-80% to 90% or above, and the purpose of obtaining a battery-grade high-purity manganese sulfate product through two times of recrystallization is achieved.

The invention discloses an integrated wet-process waste gas multi-pollutant efficient cooperative treatment device and method. The device is provided with a pre-oxidation section, a centrifugate membrane gas-solid separation section, a wet spraying absorption section, a rotational flow dehydration section, an electrostatic reaction section, a filler demisting section and an adsorption and catalytic reaction section, an air inlet pipe and a liquid discharge pipe are arranged at the bottom of the device, and an exhaust pipe is arranged at the top; the pre-oxidation section comprises a gas inlet pipe, an oxidant injection pipe and a mixing plate; the centrifugate membrane gas-solid separation section, the wet spraying absorption section, the rotational flow dehydration section, the electrostatic reaction section, the filler demisting section and the adsorption and catalytic reaction section are sequentially arranged from bottom to top. By means of the device and method, particulate matter, sulfur dioxide, nitric oxide, fluoride, HCl, heavy metal, VOCs, dioxin, malodorous gas and other waste gas multiple pollutants generated in the solid hazardous waste co-treatment process of the industrial kiln and the industrial boiler can be removed, and waste gas emission meets the emission standard and sensory requirements.

The invention belongs to the technical field of masonry cement, and particularly discloses all-solid-waste low-carbon-emission masonry cement and a preparation method thereof. Comprising the following steps: 1, finely grinding iron tailings, carbide slag, fly ash and silica fume, and proportioning according to a design to obtain a cement raw material; 2, agglomerating or pelletizing the cement raw material, and calcining according to a designed temperature to obtain a cement clinker; and 3, mixing the cement clinker with a certain proportion of gypsum, and grinding to the target fineness to obtain the masonry cement. The masonry cement is prepared from all solid wastes, meanwhile, a calcium source is mainly provided by the carbide slag with low carbon emission, compared with cement fired by calcium carbonate calcium sources, the carbon emission is greatly reduced, the goal of high-valued and green utilization of various solid wastes including iron tailings is achieved, and the method is suitable for industrial production. The compressive strength, the sulfur trioxide content and the screen residue of the prepared masonry cement meet the national standard requirements of masonry cement. In addition, the masonry cement is prepared from all solid waste raw materials, so that the preparation cost of the masonry cement is reduced.

The invention discloses a sulfur dioxide pollution source diffusion simulation and prediction method. The method comprises the following steps: analyzing and collecting real-time monitoring data of pollution source emission by using multispectral imaging, classifying pollution sources, identifying a concentrated area of the pollution sources, and defining the concentrated area of the pollution sources as pollution hot spots; estimating the emission intensity of a pollution source by using a reverse calculation technology, and modeling and predicting the time change of pollutant emission; integrating meteorological data, and considering the influence of terrain on a pollutant diffusion path; simulating a motion path of each unit pollutant in the air and a superimposed effect among a plurality of pollution sources; according to the method, the complete process of pollution source identification, diffusion modeling, dynamic prediction, health exposure assessment and mitigation measure optimization is realized, the innovative steps of virtual pollution cloud modeling, dynamic population exposure assessment and pollution mitigation path optimization expand the capability of traditional pollutant diffusion prediction, and it is ensured that the method is more comprehensive and accurate.

The invention relates to a device and a method of a high-sensitivity suspension single-droplet sensor for monitoring PM2.5 pollution, belongs to the technical field of aerosol microdroplet spectrum trace analysis, and solves the problem that ppb-magnitude gas cannot be monitored in the prior art. The method comprises the following steps: pumping aerosol into a sample cell of a droplet suspension system in a single droplet form; introducing required reaction gas into the sample pool through an atmosphere control system; scattered light signals of the single liquid drops are respectively input into the dynamic signal processing system and the microdroplet imaging system; acquiring the characteristic peak displacement change of the metal ion sensing microdroplet; establishing a gas particle distribution Mie scattering inversion model based on micro-droplet dynamic response; inverting the radius of the liquid drop according to the stimulated Raman scattering / stimulated elastic scattering signal; according to the quantitative relationship of the reaction, calculating the generation of sulfate by the droplet suspension system (sensor); and judging which gas in the actual atmosphere is a main oxidation pathway for oxidizing sulfur dioxide to generate sulfate pollutants according to a calculation result.

The invention discloses a carbon capture and amine recovery system. The system comprises a rough washing tower, an absorption tower, a decarbonization tower and a deamination tower which are sequentially connected through a pipeline system, the rough washing tower is used for removing pollutants in the flue gas, including sulfur oxides, PM particles, hydrogen sulfide and the like; an amine solution spraying module is arranged at the upper part of the absorption tower, flue gas enters from a lower layer area of the absorption tower, and the amine solution spraying module sprays an amine solution to capture carbon dioxide in the flue gas so as to form a carbon capture solution and decarbonized flue gas; the decarburization tower is used for receiving the carbon capture solution and treating the carbon capture solution to obtain high-purity CO2 and a recovery solution; wherein the high-purity CO2 is discharged or retreated; the recovery solution flows back to an amine solution spraying module in the upper layer area of the absorption tower through a pipeline system to realize cyclic utilization; and the decarbonized flue gas is upwards conveyed to a deamination tower, and is discharged after deamination. Through one set of system, three-stage flue gas purification treatment of desulfurization, carbon capture and amine capture and recovery is realized, and the whole set of system is high in recovery efficiency.

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 provides a BAPV photovoltaic module, high-temperature colored glazed glass and a tempering method thereof, and the method comprises the following steps: providing colored glazed glass to be tempered, the thickness of the colored glazed glass being less than a preset thickness; obtaining tempering parameters corresponding to the colored glazed glass according to the thickness of the colored glazed glass; the tempering parameters at least comprise tempering temperature, tempering time and tempering speed; introducing sulfur dioxide gas into the ceramic roller way of the toughening furnace so as to form a protective film on the surface of the ceramic roller way; providing a plurality of pieces of drilling glass; performing tempering in a ceramic roller way according to a preset number of drilled glass so as to adsorb redundant sulfur dioxide gas when a protective film is formed in the furnace body; and after adsorption of the sulfur dioxide gas is completed, tempering of the colored glazed glass is completed in a ceramic roller way according to tempering parameters, and the tempered colored glazed glass is obtained. The provided high-temperature colored glazed glass toughening method not only solves the problems of single appearance color and glare of a traditional BAPV assembly, but also improves the toughening quality and the production efficiency, and has remarkable environmental protection and economic benefits.

The invention discloses a coal bunker mixed gas concentration detection method based on a BSA algorithm and a BP neural network, and belongs to the technical field of gas detection. The coal bunker mixed gas concentration detection method based on the BSA algorithm and the BP neural network comprises the following steps: collecting gases including carbon monoxide, nitrogen dioxide, sulfur dioxide, hydrogen sulfide and methane, and constructing the BP neural network by taking normalized gas data as an input layer; and optimizing BP neural network parameters by using a BSA bird flock algorithm, carrying out network training by using a back propagation algorithm, and inputting gas concentration data collected in real time into the trained neural network in real time to obtain a predicted value of the gas concentration. According to the method, the parameters of the BP neural network are optimized through the BSA algorithm, the accuracy of network prediction is greatly improved, the gas concentration in the coal storage bunker can be monitored in real time, and once it is detected that the hazardous gas concentration exceeds the standard, quick response can be made and corresponding measures can be taken, so that potential safety risks are reduced.

The invention relates to the technical field of industrial waste gas treatment, in particular to a waste gas treatment system and method based on wet desulphurization. The system comprises a waste gas pretreatment unit, a composite absorption reaction unit, a gas-liquid separation unit, an absorption liquid circulation system, an intelligent control system and a waste liquid treatment unit, wherein each unit is communicated with a shielding signal line through a corrosion-resistant pipeline to form a closed-loop operation system; industrial waste gas is subjected to pre-dedusting and cooling through the waste gas pretreatment unit and then enters the composite absorption reaction unit to be in countercurrent contact with a composite absorbent to achieve sulfur dioxide removal, a gas-liquid mixture obtained after reaction is separated through the gas-liquid separation unit, purified gas is directly discharged, and absorption liquid enters the absorption liquid circulation system to be recycled. And the saturated absorption liquid with the density of 1.15-1.25 g / cm < 3 > is conveyed to a waste liquid treatment unit for treatment. According to the invention, sulfur dioxide in waste gas can be efficiently removed through synergistic absorption and intelligent control, the operation cost is reduced, and equipment corrosion is reduced.

The invention relates to the technical field of atmospheric science and remote sensing, in particular to a volcanic sulfur dioxide vertical section inversion method based on a Lagrange diffusion model, and the method comprises the steps: obtaining volcanic eruption total mass constraint, satellite sulfur dioxide column concentration and effective pixels, three-dimensional meteorological driving data and chemical clearing parameters; calculating a vertical weighting function by utilizing a radiation transmission mode, and generating initial vertical distribution by combining with a column concentration layering ratio; constructing a diffusion model to simulate an air mass backward track and match observation pixels to obtain attribution air mass distribution; optimizing a volcanic sulfur dioxide vertical emission profile time sequence based on attribution distribution and total mass constraint; and inputting the sequence into a diffusion model for forward simulation, comparing satellite observation data to calculate a verification index, correcting a diffusion coefficient according to a threshold value, and outputting a target vertical emission profile time sequence. According to the method, through backward trajectory attribution and forward verification closed-loop optimization, the volcanic sulfur dioxide vertical distribution inversion precision is remarkably improved.

A thin-film composite membrane incorporating a gas separation layer from a polyphenylene ionomer, a nonporous high-diffusion rate layer, and a porous layer support is disclosed. The thin-film composite membrane may be used in a process to separate carbon dioxide, sulfur dioxide, hydrogen sulfide, or an alkene from a mixture with a less permeable component in a gaseous feed stream.

The system comprises a mixed gas pipeline, a heat exchanger a, a heat exchanger b, a heat exchanger c and a multi-stage refrigerating unit, the heat exchanger a, the heat exchanger b and the heat exchanger c are sequentially connected in series, the multi-stage refrigerating unit feeds cold media into the heat exchanger a, the heat exchanger b and the heat exchanger c for heat exchange, and the mixed gas pipeline is communicated with the heat exchanger a; and the output ends of the heat exchanger a, the heat exchanger b and the heat exchanger c are respectively provided with a gas-liquid separation tank a, a gas-liquid separation tank b and a gas-liquid separation tank c. According to the system and the method for separating and purifying the ammonium sulfate in the electrolytic manganese residues, gaseous sulfuric acid, sulfur dioxide, ammonia gas and nitrogen in mixed gas are respectively condensed and gradually recovered by utilizing the characteristic that the boiling points of the gaseous sulfuric acid, the sulfur dioxide, the ammonia gas and the nitrogen are different, components are used for recovering the ammonium sulfate and the nitrogen, and the sulfur dioxide is separated out; the ammonium sulfate recovery efficiency reduction caused by sulfur dioxide influence is avoided.

The invention discloses a platinum chemical plating solution and a preparation method and application thereof in semiconductors, the platinum chemical plating solution comprises the following raw materials: 0.5-10.0 g / L of platinum salt PEP, 2.1-10.0 g / L of ethylenediamine sulfate, 1.2-8.9 g / L of malonic acid, 5-50 g / L of ammonium acetate, 1.2-9.2 g / L of thiourea dioxide, and the balance of ultrapure water and ammonia water; and the pH value of the solution is adjusted to 7.0 by ammonia water. The platinum chemical plating solution disclosed by the invention is suitable for nano precision manufacturing and processing on the surface of an electronic element product of a semiconductor device, and a formed platinum metal film has excellent uniform distribution, compactness and high wear resistance; a semiconductor electronic component product with excellent plugging performance, corrosion resistance, high-precision conductivity and high-quality electronic signal transmission performance is obtained.

The invention discloses a continuous preparation method of sodium tanshinone IIA sulfonate based on a single-tube thin-layer liquid membrane reactor. Comprising the following steps: (1) dissolving tanshinone IIA in an organic solvent as a feed liquid; (2) reacting gas-phase sulfur dioxide with air, and cooling to obtain sulfur trioxide mixed gas; (3) enabling the feed liquid and sulfur trioxide mixed gas to enter a single-tube thin-layer liquid membrane reactor in a parallel flow or reverse flow manner, and carrying out continuous sulfonation reaction to obtain reaction liquid; and (4) adding a sodium salt aqueous solution into the reaction solution to carry out salt forming reaction, centrifuging, drying and purifying to obtain the tanshinone IIA sodium sulfonate. According to the invention, a novel method is adopted to carry out sulfonation reaction on tanshinone IIA, and sulfur trioxide is basically completely consumed after the reaction is finished, so that the generation of waste acid is greatly reduced, and the method has important significance on environmental protection and cost reduction. The green, safe, efficient and continuous preparation of the high-purity tanshinone IIA sodium sulfonate is realized.

Methods and associated production plants are disclosed for producing concentrated oleum or sulfur trioxide therefrom with high purity, and particularly with minimal sulfur dioxide. The methods involve use of a single contact, single absorption sulfuric acid plant operating under an unconventional set of parameters including: reacting sulfur and high purity oxygen in a combustion reactor to form sulfur dioxide at a concentration between 11.5 and 20% by volume and with an atypical oxygen to sulfur dioxide molar ratio ≥ 1; atypically catalytically converting > 96% by volume of the sulfur dioxide to sulfur trioxide in a contact apparatus; and atypically recycling > 95% by volume of the total gases from an absorption apparatus to the combustion reactor. Concentrated oleum with < 300 ppm dissolved sulfur dioxide can desirably be produced with sulfur utilization ≥ 80% using a smaller, cost-effective sulfuric acid plant. The co-production of unnecessary sulfuric acid can also be reduced.

The invention discloses a desulfurizing agent for a cement kiln as well as a production method and application of the desulfurizing agent. The desulfurizing agent is prepared from the following raw material components in percentage by weight: 88-96 wt% of limestone; 2-6 wt% of an iron raw material; 1-6 wt% of gypsum; and 0-4 wt% of a silicon-aluminum material. The desulfurizer is produced by utilizing a kiln line of a cement enterprise, is dried and ground with raw materials according to a mass ratio of 1: 100 to 3: 100, and then is put into a cement kiln system for cement clinker production, so that the emission concentration of sulfur oxides in kiln tail flue gas produced by sulphoaluminate cement clinker can be reduced from more than 2000mg / Nm < 3 > to less than 35mg / Nm < 3 >; and for other types of cement clinker, the content of the cement clinker can be reduced from 1000 mg / Nm < 3 > or above to 35 mg / Nm < 3 > or below, the desulfurization effect is stable, and the environment-friendly emission requirement can be continuously met.

The invention provides a coal-based solid waste foamed cement material for filling a coal mine tunnel and a preparation method of the coal-based solid waste foamed cement material. The coal-based solid waste foamed cement material comprises 10-30 parts of coal gasification coarse slag micro powder, 0-30 parts of first-grade fly ash, 70-90 parts of cement, 0.3-0.8 part of a foam stabilizer and 0.1-0.5 part of an additive, the coal-based solid waste foamed cement material is further doped with foam, the mixing amount of the foam is 2-5 times of the volume of the cement slurry, the coal gasification coarse slag micro powder is coal water slurry furnace gasification coarse slag, and the coal gasification coarse slag micro powder is prepared from, by mass, 40% of silicon dioxide, 19% of aluminum oxide, 15% of ferric oxide, 16% of calcium oxide, 3% of sulfur trioxide, 3% of sodium oxide, 1% of magnesium oxide and 0.5% of titanium oxide. And 0.5% of potassium oxide. According to the invention, a physical foaming method is utilized, coal-based solid waste is used as a raw material to replace part of cement, and the foamed cement material with light weight and high strength is prepared, so that the foamed cement material meets the use requirements of underground roadway filling.

The invention relates to the field of carbon dioxide capture and utilization, in particular to a method and system for producing formate through synergistic capture and conversion of flue gas carbon dioxide, formate is obtained through electrochemical conversion of carbon-rich capture liquid, capture liquid is generated, the capture liquid directly captures flue gas carbon dioxide, and the carbon-rich capture liquid is obtained again. And the carbon-rich trapping liquid is continuously recycled for electrochemical conversion. The carbon-rich capture liquid electrochemical conversion process and the flue gas carbon dioxide capture process do not need to be alternately carried out step by step, but are synchronously and continuously carried out in the same system, the whole process does not need to pre-treat a small amount of oxygen and trace nitrogen oxide and sulfur oxide gas impurities in the flue gas, and a high-energy-consumption carbon dioxide gas regeneration step is avoided; the method overcomes the defect of low single conversion rate of electrochemical conversion of carbon dioxide gas, realizes collaborative capture and conversion of flue gas carbon dioxide to produce formate, and finally realizes direct conversion and utilization of carbon dioxide from flue gas to a high-value product formate.

The invention belongs to the technical field of catalysts, and provides an oxygen-doped carbon nitride catalyst and a preparation method and application thereof.The preparation method comprises the steps that melamine, a hydrogen peroxide aqueous solution and acetonitrile are mixed and subjected to a hydrothermal reaction, and a precursor material is obtained; and calcining the precursor material to obtain the oxygen-doped carbon nitride catalyst. The method has the following advantages: (1) the synthesis process of the catalyst is simple, the raw materials for synthesizing the catalyst are cheap and easily available, the equipment requirement for synthesizing the catalyst is simple and convenient, and the operation is easy; and (2) the catalyst has excellent reaction catalytic performance for selective oxidation of sulfides, has good substrate adaptability, is easy to recycle and reuse, and still has high yield after being used for many times. And (3) the adaptability of photocatalytic heterogeneous oxidation to substrate expansion in drug molecules is rarely reported at present, and the invention provides an application method of a metal-free photocatalyst for efficiently and selectively oxidizing sulfide under the condition of no additional additive.

The application provides a preparation method of ergothioneine and application of a mercapto compound in the method. The method comprises the following steps: in the presence of a catalyst system, a sulfur oxide is reacted to generate ergothioneine. The catalyst system comprises a first catalyst and a second catalyst. The first catalyst is ergothioneine synthase, and the second catalyst is one or more of a mercapto-containing amino acid and a mercapto-containing polypeptide. The preparation method of ergothioneine provided by the application does not need to use a large amount of a chemical mercaptan reagent with a foul smell, has the advantages of high efficiency, green environmental protection, and friendly production scene, and is beneficial to industrial production of ergothioneine.