41 results about "Calcium sulfite" patented technology

The invention discloses a green roasting method for recycling desulfurized gypsum, and belongs to the technical field of solid waste recycling. According to the process disclosed by the invention, the desulfurized gypsum solid waste rich in calcium sulfate is used for replacing part or all of sulfate to be mixed with lepidolite for roasting reaction, and components such as calcium carbonate and calcium sulfite contained in the desulfurized gypsum are utilized by controlling the step-by-step heating rate and the roasting temperature; under specific roasting process conditions, calcium oxide and calcium sulfide generated through self-reaction serve as purifying agents and react with fluorine and thallium to form stable calcium fluoride and thallium sulfide precipitates, fluorine and thallium are fixed in the high-temperature roasting stage, the pressure of follow-up flue gas treatment and wastewater treatment is effectively reduced through self-purification, and environmental pollution is reduced.

This invention relates to the field of exhaust gas treatment technology, and more particularly to an exhaust gas treatment device for steel tailings treatment. The device includes a base plate, a workbench on top of the base plate, a support on top of the workbench, and a mounting shell on the left side of the top of the support. A first pipe is mounted on the mounting shell, and a second pipe is connected to the right side of the first pipe. The dust removal component of this device uses a servo motor-driven rack and pinion transmission to achieve dynamic switching of multiple filter plates. This allows for the replacement of clogged filter plates without stopping the machine, ensuring continuous dust removal operations. Simultaneously, the double-layer filtration structure improves the interception effect of large particulate impurities. The jet stirring component, in conjunction with the drive component, enables the three treatment chambers to rotate and stir synchronously, ensuring full contact between the exhaust gas and the calcium hydroxide solution. This significantly increases the acid-base neutralization reaction rate, reduces the residue of pollutants such as calcium sulfite and lead hydroxide, and improves the exhaust gas purification effect.

The present application relates to a kind of oxidation separation and reuse process of wet flue gas desulfurization circulating slurry, for processing calcium-based wet flue gas desulfurization system of fluorine chloride containing flue gas.The process is from the high load circulating slurry containing calcium sulfite, calcium sulfate, chloride and fluoride of first-stage washing circulating tank side line extraction, is carried out under the condition of limiting pH and oxidation-reduction potential oxidation conditioning, then the bottom stream containing calcium sulfate as seed slurry returns crystal conditioning unit, promote calcium sulfate particle growth;Subsequently, concentrated separation and filter separation are obtained filter cake, low turbidity filtrate and high turbidity reflux liquid, and high turbidity reflux liquid returns oxidation conditioning unit or crystal conditioning unit.Low turbidity filtrate is according to turbidity, conductivity, chloride concentration and fluoride concentration, and the efficiency of filtrate reuse is improved.

The invention discloses a method for degrading short-chain chlorinated paraffin in soil based on a calcium sulfite-ferric sulfate double slow-release system, and relates to the technical field of soil and groundwater pollution remediation. The invention aims to solve the problems of high energy consumption, high cost and low efficiency and degradation rate when the short-chain chlorinated paraffin in the soil is degraded by the existing method. The method comprises the following steps: drying ferric sulfate-sodium alginate hydrogel until no water exists on the surface to obtain a ferric sulfate-sodium alginate slow-release agent; the method comprises the following steps: adding soil containing short-chain chlorinated paraffin into a container, then adding a ferric sulfate-sodium alginate slow-release agent, pure water and calcium sulfite, placing the container on a shaking table, sealing the container, and reacting for 1-14 days at the temperature of 10-30 DEG C; the method for degrading the short-chain chlorinated paraffin in the soil based on the calcium sulfite-ferric sulfate double slow-release system can be obtained.

The invention provides a method for removing total DNA (Deoxyribose Nucleic Acid) in wastewater with halide ion tolerance, which is used for removing DNA in wastewater containing halide ions based on a potassium ferrate and calcium sulfite coupling system, and belongs to the technical field of sewage purification treatment. The method provided by the invention utilizes Fe (IV) / Fe (V) / Fe (VI) and flocculent precipitate which are not interfered by halide ions in the reaction of potassium ferrate and slightly soluble calcium sulfite to realize efficient removal of DNA in wastewater. According to the method, the oxidation stability under halide ion interference is remarkably improved, better environmental adaptability and more stable removal efficiency are shown, and a new technical scheme is provided for treatment of actual wastewater containing resistance genes.

The present application relates to the field of metallurgical environmental protection technology, and particularly relates to a flue gas desulfurization system and process based on calcium-based desulfurizer. The present application is based on the existing sodium-based desulfurization system for lightweight modification, without the need for new desulfurization production line, greatly reducing the equipment capital investment and transformation cost; at the same time, low-cost calcium-based desulfurizer is used to replace high-priced sodium-based desulfurizer, canceling the special grinding equipment with high operation and maintenance cost, combining with real-time working condition to adaptively adjust the desulfurizer injection amount, which can reduce the invalid consumption of desulfurizer, and comprehensively reduce the enterprise desulfurization operation cost; the present application realizes efficient resource utilization of desulfurization by-products, the calcium sulfite and calcium sulfate by-products generated by desulfurization reaction have high purity and low water content after screening and air separation purification, without toxic and harmful impurities, which can be directly used as building material production raw materials, completely eliminating the land occupation and secondary pollution problems caused by the accumulation and landfill of traditional sodium-based desulfurization by-products, with outstanding environmental protection benefits and social value.

The invention discloses a method for leaching zinc, indium, gallium and germanium from neutralized gypsum residues, and belongs to the technical field of metallurgy and chemical engineering. Comprising the following steps that neutralized gypsum residues and sulfuric acid are mixed and subjected to size mixing, the mixture is added into a reaction kettle, sulfur dioxide is introduced for reduction leaching, and reduction leaching residues and leaching liquid containing zinc, indium, gallium and germanium are obtained. Then the reduction leaching residues and a sulfuric acid solution are mixed and subjected to size mixing, the mixture is added into a reaction kettle, oxygen is introduced for oxidation crystallization, a stirring reaction is conducted, and an oxidation crystallization product and crystallization filtrate are obtained; and carrying out multi-stage countercurrent washing on the oxidized and crystallized product to obtain the byproduct gypsum. According to the method, valuable components such as zinc, indium, gallium and germanium in the neutralized gypsum residues are deeply leached in a reduction leaching and oxidation crystallization mode, meanwhile, residual calcium sulfite in the leaching residues is oxidized and crystallized into dihydrate gypsum, leaching of valuable metal is achieved, the quality of the byproduct gypsum is improved, and the method has the advantages of being short in technological process, high in multi-metal leaching rate, low in cost and the like. The grade of gypsum is high.

The invention provides a method and system for measuring sulfite in desulfurization slurry based on multi-parameter integrated measurement, and the method comprises the steps: carrying out the analysis and research of the anti-corrosion and anti-interference performance and measurement precision of electrodes in an extreme environment of desulfurization slurry, and carrying out the type selection of various electrodes; a plurality of online measurable time sequence parameters are measured, corresponding sulfite concentration test values are synchronously obtained, and a multi-parameter associated data set is generated; based on the multi-parameter association data set, modeling and hyper-parameter tuning are carried out on a nonlinear sequential relationship among multiple variables, and a sulfite concentration prediction model is constructed; and optimizing the anti-interference performance of the prediction model through cross-unit transfer learning, dynamic disturbance test and sensitivity analysis, and outputting the sulfite concentration in the desulfurization slurry to be measured through the optimized prediction model. According to the method, sulfite and original monitoring parameters are subjected to multi-parameter integrated measurement, and the concentration of calcium sulfite in the slurry can be stably and accurately measured in real time.

The present application relates to the field of metallurgical solid waste resource utilization and industrial flue gas purification, and specifically discloses a process method for flue gas desulfurization by steel slag method, which comprises the following steps: using steel plant solid waste steel slag as a calcium source to prepare organic calcium salt or inorganic calcium salt as a circulating desulfurizer, sequentially preparing a desulfurization liquid, wet flue gas desulfurization, calcium sulfite oxidation separation, desulfurizer regeneration, and steel slag tailing resource utilization, to form a desulfurizer closed loop circulation system. The present application realizes synergistic effect of flue gas desulfurization, steel slag consumption and resource recovery, has stable desulfurization efficiency, far exceeds the low emission standard, and is suitable for wide working condition fluctuation. Using steel slag as a calcium source and desulfurizer closed loop circulation, the raw material and operation cost are greatly reduced, and high purity gypsum and iron concentrate powder can be produced to create income. Steel slag realizes 100% resource utilization, and fundamentally solves the problem of pollution caused by stacking. The process can be directly connected to the existing wet desulfurization equipment, has low modification cost and simple operation and maintenance, greatly reduces the equipment failure rate, and has great industrialization promotion value.

This invention belongs to the field of artificial soil technology, and relates to a fluidized solidified soil, its preparation method, and its application. This invention provides a fluidized solidified soil, which is composed of soil, a fluidized solidifying agent, and water in a mass ratio of 100:5~20:10~40; the fluidized solidifying agent is composed of slaked lime, fly ash, zinc oxide, calcium sulfite, a polymer compound, and a complexing agent in a mass ratio of 10~20:10~20:5~10:5~10:20~40:1~5; the polymer compound is selected from at least one of propylene glycol monolaurate, polyacrylamide, and hydroxypropyl methylcellulose; the complexing agent is selected from at least one of EDTA, EGTA, and DTPA. This invention solves the technical problems of insufficient anti-collapse ability, low early strength, and poor water stability in the solidified body formed by slaked lime and fly ash when used in the preparation of fluidized solidified soil.

The invention relates to the field of agricultural resource utilization, and particularly discloses saline-alkali soil conditioning particles rich in humic acid and a use method of the saline-alkali soil conditioning particles. According to the technical scheme, the particles are homogeneous particles prepared from the following raw materials in parts by weight through reactive extrusion granulation: 50-65 parts of weathered coal powder, 5-10 parts of maleic anhydride, 20-30 parts of calcium sulfite, 0.1-0.5 part of manganese sulfate, 5-10 parts of alkyl glycoside, 5-10 parts of sodium lignin sulfonate and 5-15 parts of water. The humic acid content of the weathered pulverized coal is greater than or equal to 50.0%, and the granularity of the weathered pulverized coal passes through a 80-120-mesh sieve; the grafting reaction is initiated by using free radicals generated by auto-oxidation of calcium sulfite, an additional organic initiator does not need to be added, organic residues are avoided, meanwhile, chemical modification of humic acid is achieved, the carboxyl content is increased, and the exchange capacity of conditioning particles for sodium ions in soil is improved.

The utility model discloses a kind of green soil material production systems based on calcium sulfite and sodium sulfite, comprising: reaction kettle shell, a pair of side bearing seat and kettle inner seat;The utility model relates to the technical field of green soil production and processing, the production system is realized by material pushing and stirring structure of accurate calcium sulfite and sodium sulfite with quantitative mixing: two raw materials are proportionally conveyed to reaction kettle shell by independent metering module, ensure uniform mixing by multidimensional continuous turning over after, cooperate with electric auxiliary heating layer and maintain optimum reaction temperature, then catalyst spraying release structure starts, atomizing spray nozzle will catalytic component with droplet form evenly cover material surface, make catalytic reaction efficiently, from process can completely eliminate raw material cross-contamination.

The application discloses a kind of dynamic adjustment method and system based on magnetic suspension fan of desulfurization oxidation air volume, the method real-time acquisition desulfurization system operating parameter, target air volume is calculated based on multi-parameter dynamic correlation model, the model is through the pre-judgment of quantification unit load change to flue gas total amount, the proportional relationship of flue gas flow and oxidation demand and the feedback regulation of calcium sulfite content, dynamically adjust each parameter influence weight to generate target air volume;According to target air volume, the rotational speed of magnetic suspension fan is adjusted, using its wide air volume adjustment range and high-precision frequency control characteristics, outlet pressure is stabilized in set interval and realizes the rapid response of air volume;Through double closed loop feedback mechanism optimization adjustment process, model parameters are periodically corrected in combination with remote operation and maintenance platform to improve long-term operation efficiency.The application can realize the rapid response and accurate matching of desulfurization system oxidation air volume, significantly improve desulfurization efficiency and reduce energy consumption.

This application provides a method for preparing α-hemihydrate gypsum using desulfurized gypsum. The method involves mixing desulfurized gypsum with salt production effluent, then introducing air to allow the calcium carbonate and calcium chloride in the desulfurized gypsum to react with the effluent to form calcium sulfate, while simultaneously oxidizing calcium sulfite to calcium sulfate. After a period of time, the mixture is placed in an autoclave with a certain amount of crystallizing agent added and stirred thoroughly. After the reaction is complete, the mixture is immediately filtered, dried, and ground to obtain α-hemihydrate gypsum. The method for preparing α-hemihydrate gypsum using desulfurized gypsum provided in this application can improve the conversion rate of desulfurized gypsum to α-hemihydrate gypsum and meets the requirements of a green economy, thus possessing significant economic and environmental benefits.

The invention discloses a manganese removal method based on potassium permanganate and calcium sulfite synergistic activation molecular oxygen, and belongs to the technical field of water treatment. The method comprises the following steps: firstly, adding potassium permanganate into manganese-containing water for preliminary oxidation, then adding calcium sulfite with slow release performance, reacting sulfite ions slowly and continuously released by the calcium sulfite with dissolved oxygen in the water to generate sulfate free radicals, oxidizing the residual divalent manganese into manganese dioxide, and filtering and removing the manganese dioxide through coagulating sedimentation. According to the method, the dosage of potassium permanganate is reduced through free radical reaction of calcium sulfite, and potassium permanganate is reduced when the potassium permanganate is excessive, so that the problem of effluent chromaticity is avoided; in addition, the final product calcium sulfate oxidized by calcium sulfite has a coagulation aiding effect, is beneficial to instability and precipitation of manganese dioxide, and guarantees the manganese removal effect. The method is high in manganese removal efficiency, stable in operation and low in cost, is slightly influenced by the fluctuation of the manganese concentration of the inlet water, solves the problems that the dosage is difficult to control and the chromaticity is easy to exceed the standard in the traditional process, and is favorable for guaranteeing the water quality safety of supplied water.

The application discloses high-performance dechlorination mineralization ceramic microspheres and a preparation method thereof. The ceramic microspheres comprise the following components in mass fraction: 90-93% of calcium sulfite, 3-4% of calcium oxide, 3-4% of zinc oxide and 1-2% of silicon dioxide. The particle size of the ceramic microspheres is 1-2 mm. Compared with the existing ceramic material sintering technology, the dechlorination mineralization ceramic microspheres are composed of calcium sulfite, calcium oxide, zinc oxide and silicon dioxide, deionized water and external mechanical pressure are used to help the ceramic powder densification, and rapid forming is realized at a lower ceramic sintering temperature, so that time can be saved and production capacity can be improved in actual production. Meanwhile, the dechlorination mineralization ceramic microspheres prepared by using the preparation process can be filled in a filter container and directly applied, the content of calcium sulfite is as high as 90% or more, the dechlorination performance of the unit gram weight calcium sulfite ceramic microspheres is much better than that of common calcium sulfite powder and particles, and the dechlorination mineralization ceramic microspheres also have a mineralization effect.

The application discloses a kind of collaborative processing method of containing sulfur dioxide waste gas and containing sulphate ion waste water, comprising the following steps: (1) containing metal Ni nanoparticle catalyst is dispersed in sulphate ion containing waste water, and sulfur dioxide containing waste gas is imported, and pH is controlled between 2~5, and reaction is carried out;(2) calcium ion containing salt or alkali is added, and pH is adjusted to 9~10, and stirring reaction is generated calcium sulfite precipitate.The application directly treats sulfate salt waste water using SO2 waste gas, achieves waste collaborative processing, realizes "waste treatment with waste".

The invention discloses a spraying ring pipe of a desulfurizing tower, which comprises more than two spraying heads and a lower supporting plate which are arranged at the bottom of a liquid discharge pipe, the spraying heads are embedded in the lower supporting plate, the spraying heads are communicated with the interior of the liquid discharge pipe, and the bottom of the lower supporting plate is provided with an abdicating hole; the outer side of the liquid discharging pipe is slidably connected with an outer sleeve, the spraying heads are arranged in the outer sleeve, the bottom end of the outer sleeve is provided with a bottom hole, the arrangement distance between the bottom hole and the spraying heads is consistent, the inner side of the liquid discharging pipe is slidably connected with an inner sleeve, the bottom of the inner sleeve is provided with an inner hole, and the arrangement distance between the inner hole and the spraying heads is consistent. And the connecting rod penetrates through the end part of the liquid discharge pipe and is fixedly connected with the inner wall of one end of the outer sleeve. The inner sleeve and the outer sleeve are reset, the outer sleeve hermetically covers the spray head, a physical barrier is formed to block a contact path of residual smoke in the tower and residual slurry in the spray head, the smoke and the slurry are prevented from reacting to generate calcium sulfite and calcium sulfate crystals, and the sealing structure can also prevent external dust from entering the spray head after shutdown.

The application discloses a kind of high-efficiency catalytic oxidation desulfurization ash calcium sulfite method of hydrothermal method, by with steel slag powder and copper sulfate catalyst in lower temperature hydrothermal condition to semi-dry method desulfurization ash unstable sulfite SO3 2‑ Catalytic oxidation is carried out, which can significantly reduce the content of unstable sulfite SO3 2‑ In semi-dry method desulfurization ash, so that it can be better applied in the field of building materials, has higher stability. At the same time, since steel slag powder belongs to solid waste, the cost is low, and the amount of catalyst can be reduced, which is a waste-to-waste treatment method for low-cost and efficient conversion of CaSO3 in desulfurization ash at low temperature, which is beneficial to the resource utilization of desulfurization ash and steel slag, and has important significance for environment and sustainable development.

This invention relates to the field of inorganic composite materials technology, specifically to a lightweight, flexurally resistant gypsum board reinforced with plant fibers. The plant short fibers used in the gypsum board are impregnated with calcium hydroxide solution and fumigated with sulfur dioxide gas, resulting in an in-situ calcium sulfite / calcium sulfate microcrystalline coating layer on their surface. This enhances the interfacial bonding between the fibers and the gypsum matrix. During preparation, a dry-mixing followed by wet-mixing process ensures component uniformity. A combination of vacuum filtration and hot-pressing is used to achieve rapid dehydration and high-pressure compaction of the slurry. The gypsum board produced by this invention maintains its lightweight nature while exhibiting excellent flexural strength and impact resistance, solving the problem of insufficient mechanical properties in traditional lightweight gypsum boards.

The utility model discloses desulfurization and denitrification treatment equipment, which belongs to the technical field of desulfurization and denitrification treatment and comprises a desulfurization tower, a first fan is mounted on one side of the desulfurization tower, a spraying structure is arranged at the upper end in the desulfurization tower, the lower end of a protective cover is connected with a circulating pump water pipe, and a rotating structure is mounted at the lower end in the desulfurization tower. According to the waste gas desulfurization and denitrification device, the heat collection assembly is arranged, cold water enters the spiral water pipes in the first mounting box and the second mounting box, and the heat conduction plate and the heat conduction cotton conduct heat generated during the desulfurization and denitrification reaction of waste gas, so that heat exchange with the cold water in the spiral water pipes can be carried out, and the reaction heat can be conveniently utilized; the filtering assembly is arranged, the filtering cylinder is inserted and fixed to the outer side of the circulating pump water pipe through the positioning insertion rod, a fine filtering net in the filtering cylinder can filter a solution, and the phenomenon that calcium sulfite and calcium sulfate paste enter the circulating pump water pipe along with the solution to block the spraying structure is avoided.

This invention provides a method for preparing calcium sulfate dihydrate from desulfurization ash and the calcium sulfate dihydrate itself. The method includes: (1) treating the desulfurization ash into a slurry; (2) mixing the slurry from step (1), an oxidant, and a catalyst, followed by micro / nano bubble treatment, and obtaining calcium sulfate dihydrate after solid-liquid separation. This method constructs a synergistic system of "oxidant, catalyst-micro / nano bubble" to efficiently and stably treat dry desulfurization ash generated in industries such as steel and coking, achieving efficient and complete conversion of calcium sulfite and controllable growth of calcium sulfate dihydrate crystals, ultimately obtaining a high-quality product that meets the standards for building gypsum. Furthermore, the entire preparation process of this invention is simple to operate, economical, efficient, and environmentally friendly, significantly improving the feasibility and economy of converting desulfurization ash into gypsum.

The present application relates to a kind of for flue gas after oxidation denitration agent and its denitration process.Flue gas is oxidized after oxidizing agent, part NO is converted into NO2;In lime silo or the bottom of circulating fluidized bed semi-dry method reactor, the denitration agent is added, the denitration agent includes Ca base denitration agent and modified Ca base denitration agent, wherein, Ca base denitration agent includes four kinds of core components, such as calcium sulfite, calcium hydroxide, calcium carbonate and calcium sulfate;Modified Ca base denitration agent is added with a small amount of modifier, such as sulfur base denitration enhancer, free radical trapping agent, phase transfer agent, on the basis of four kinds of core components.Ca base denitration agent four kinds of core components realize NO2 and NO removal, compared with the traditional lime simultaneous desulfurization and denitrification technology, the present application can significantly improve NO2 removal effect and remove part NO, reduce O3 usage and escape, improve desulfurization and denitrification slag quality.

The utility model discloses a filter which comprises a main body provided with a water filtering pipe, a water inlet and a water outlet, the water filtering pipe is arranged in the main body, the water inlet is communicated with the water inlet end of the water filtering pipe, and the water outlet is communicated with the interior of the main body through the water outlet end of the water filtering pipe; the filter assembly comprises a filter element, the filter element is arranged in the main body, the filter element is in butt joint with the water inlet end of the water filter pipe, calcium sulfite particles and Shuailing bead particles are sequentially arranged in the filter element, and a first filter screen is arranged on the outer side of the filter element. Tap water enters the main body from the water inlet and is filtered by the first filter screen of the filter element, large-particle impurities such as silt are filtered out, incrustation in water is removed through the water beads, accumulation of the incrustation is avoided, blockage of the filter element is avoided, user experience is improved, chlorine in water is filtered through calcium sulfite, and the filtering effect is further improved.

The present application relates to the field of flue gas desulfurization energy saving technology, disclose a kind of oxidizing fan system, comprising: frequency conversion centrifugal fan unit is input oxidizing air to slurry pool;Calcium sulfite concentration tester obtains calcium sulfite concentration value from slurry pool;Dissolved oxygen meter obtains dissolved oxygen concentration value from slurry pool;When calcium sulfite concentration value≤0.01mmol / L, dissolved oxygen concentration value>0.6mg / L, reduce output frequency;When calcium sulfite concentration value≤0.01mmol / L, dissolved oxygen concentration value<0.6mg / L, improve output frequency;When calcium sulfite concentration value≤0.01mmol / L, dissolved oxygen concentration value is 0.6mg / L, maintain output frequency.The application combines calcium sulfite concentration value and dissolved oxygen concentration value with frequency conversion centrifugal fan unit, adjusts the output frequency of frequency conversion centrifugal fan unit, realizes air volume regulation, and plays the energy saving effect.

This invention discloses a method for producing high-quality nano-calcium carbonate from desulfurization ash, comprising the following steps: magnetic separation of the desulfurization ash; mixing the magnetically separated desulfurization ash with water to obtain a first desulfurization ash slurry; adding a mixed solution of sodium acetate and hydrochloric acid to the first desulfurization ash slurry, reacting to obtain a second desulfurization ash slurry with an acidic pH, and collecting the CO2 generated during the reaction; performing solid-liquid separation on the second desulfurization ash slurry to obtain the byproduct calcium sulfite and a mixed solution of calcium acetate and sodium chloride; adding sodium hydroxide to the mixed solution of calcium acetate and sodium chloride to adjust the pH to alkaline, and then performing solid-liquid separation to obtain metal hydroxide slag and a mixed solution of calcium acetate and sodium chloride; statically mixing the mixed solution of calcium acetate and sodium chloride with a sodium carbonate solution containing sodium tripolyphosphate using a peristaltic pump, and separating to obtain solid nano-calcium carbonate. This invention achieves the resource utilization of desulfurization ash and also prepares high-quality nano-calcium carbonate.

This invention discloses a method for preparing cementitious materials using copper tailings, comprising the following steps: 1) ball milling the copper tailings; 2) adding acid to the ball-milled copper tailings for reaction; 3) adding alkali to the filtered precipitate for reaction; 4) adding acid again for reaction; 5) adding ethanol to the filtered solution for reaction, followed by centrifugation after the reaction is complete; 6) adding alkali to the filtrate for reaction, followed by adding hydrogen peroxide; 7) adding sodium hydroxide and Al2O3 after the reaction; 8) stirring the reaction for at least 2 hours. Using this method, the content of arsenic and heavy metals in the cementitious material product prepared from copper tailings is significantly reduced, with an arsenic removal rate exceeding 92%. The calcium sulfite content in the cementitious material product is also significantly reduced.

The invention discloses a synchronous nitrogen and phosphorus removal method based on a calcium sulfite autotrophic denitrification biofilter, which comprises the following steps: carrying out nitrogen and phosphorus removal treatment on wastewater by using the calcium sulfite autotrophic denitrification biofilter, and filling materials in the calcium sulfite autotrophic denitrification biofilter comprise polyurethane sponge and calcium sulfite, as a biological carrier, the polyurethane sponge is used for providing a microenvironment for rapid enrichment and growth metabolism activity of autotrophic microorganisms; calcium sulfite is used as an electron donor to provide SO3 < 2-> and Ca < 2 + > for reduction of nitrate and chemical precipitation of phosphate respectively, so that synchronous nitrogen and phosphorus removal in the calcium sulfite autotrophic denitrification biofilter is realized. The invention solves the problems that when the traditional sulfur autotrophic denitrification filler is used in the existing low-carbon sewage synchronous nitrogen and phosphorus removal treatment process, the alkalinity needs to be added and supplemented, the pH value of the effluent is reduced, the nitrogen removal efficiency stability is poor due to poor electron donor continuity, synchronous phosphorus removal cannot be realized, the investment and operation cost is high and the like.

The invention discloses preparation and application of a manganese cobalt hydrogen phosphate composite catalyst for rapidly activating calcium sulfite, and belongs to the field of water environment treatment. Manganese nitrate tetrahydrate, cobalt nitrate hexahydrate and sodium dihydrogen phosphate are used as raw materials to prepare manganese cobalt hydrogen phosphate; the manganese cobalt hydrogen phosphate / cerium dioxide composite catalyst is prepared by taking manganese cobalt hydrogen phosphate, cerium nitrate hexahydrate and ethanol as raw materials. The transition metal is combined with the inorganic ligand HPO42-and compounded with cerium dioxide for the first time, valence change of the metal is accelerated, the catalytic activity of calcium sulfite is improved, meanwhile, CeO2 serves as a catalyst carrier, the problem of metal ion leaching is solved, and the catalytic efficiency is improved. The preparation process is simple, convenient and environment-friendly, the removal rate of chloroquine phosphate degraded by calcium sulfite activated by the prepared composite catalyst reaches up to 95.14%, and meanwhile, the composite catalyst shows excellent recyclability and has important application value in the field of water treatment.

The present application relates to the technical field of flue gas treatment, and specifically discloses a flue gas treatment and purification device, which comprises a desulfurization tower and further comprises: a desulfurization assembly arranged on one side of the desulfurization tower, which is used for inputting and discharging slurry in the desulfurization tower and performing spray desulfurization treatment on flue gas; and an aeration assembly arranged on one side of the desulfurization tower, which is used for aerating the slurry in the desulfurization tower and stirring the slurry during aeration. The flue gas is subjected to desulfurization treatment by the desulfurization assembly, the slurry is aerated by the aeration assembly, and the touch control assembly can automatically adjust the spraying amount of the desulfurization assembly and the aeration amount of the aeration assembly according to the change of the slurry density in the flue gas treatment process. The control assembly can detect the oxidation-reduction state of calcium sulfite in the slurry and adjust the aeration amount correspondingly. The adjustment assembly can automatically increase the trigger threshold range of the oxidation-reduction state of the control assembly according to the decrease of the slurry PH.