115 results about "Calcium sulfite" patented technology

The invention belongs to the technical field of waste gas desulfurization, and particularly relates to an efficient mass transfer desulfurization tower which comprises a desulfurization tower body, a gas inlet pipe and a gas exhaust pipe, the gas inlet pipe is communicated with the bottom of one side of the desulfurization tower body, the gas exhaust pipe is communicated with the top of the other side of the desulfurization tower body, and a slurry pond is arranged at the bottom of the desulfurization tower body. A gas flow transmission power mechanism, a dynamic mass transfer synergistic mechanism, an atomization spraying mechanism and a demister are respectively arranged in the desulfurization tower from bottom to top, and a compression gas injection forced oxidation mechanism is arranged on the desulfurization tower; the waste gas kinetic energy is converted into mechanical energy, compressed injection of air is achieved through linkage gear transmission, calcium sulfite is forcibly oxidized into calcium sulfate, resource utilization of desulfurization products is achieved, and in the limited space of the desulfurization tower, sulfur-containing waste gas rises in a rotational flow mode and collides with atomized slurry at a high speed, the slurry is cut up, and gas waves continuously collide with one another to conduct rotary cutting. Liquid particles are crushed to be finer and thinner, and gas and liquid are fully mixed, so that the desulfurization efficiency is improved.

The present application pertains to processes for making calcium oxide and / or sulfuric acid from calcium sulfate. In some embodiments the processes comprise reacting a component comprising calcium sulfate with a second component comprising magnesium sulfite under conditions to form a solid comprising calcium sulfite and a solution comprising magnesium sulfate. Next, at least a portion of the solid comprising calcium sulfite is decomposed to form a second solid comprising calcium oxide, or calcium hydroxide, or cement, or clinker, or any combination thereof.

The invention discloses a double-shell calcium carbonate / calcium sulfide loaded charcoal adsorbent as well as preparation and application thereof, and belongs to the technical field of adsorbents. The double-shell calcium carbonate / calcium sulfide loaded charcoal adsorbent takes kelp charcoal as a core, calcium sulfide as an inner shell and calcium carbonate as an outer shell. The preparation method comprises the following steps: pretreating kelp powder by using calcium sulfite to obtain pretreated kelp particles; carbonizing the pretreated kelp particles to obtain calcium oxide / calcium sulfide loaded biochar; and aging the calcium oxide / calcium sulfide loaded charcoal twice to obtain the double-shell calcium carbonate / calcium sulfide loaded charcoal adsorbent. The double-shell calcium carbonate / calcium sulfide loaded charcoal adsorbent has the characteristics that the raw materials are easy to obtain, the preparation method is green, environment-friendly and convenient, the adsorption sites are rich, and the like, has relatively high adsorption capacity on Cd (II), and can be used for repairing a Cd (II) polluted water body.

The present application pertains to processes for making calcium oxide and / or sulfuric acid from calcium sulfate. In some embodiments the processes comprise reacting a component comprising calcium sulfate with a second component comprising magnesium sulfite under conditions to form a solid comprising calcium sulfite and a solution comprising magnesium sulfate. Next, at least a portion of the solid comprising calcium sulfite is decomposed to form a second solid comprising calcium oxide, or calcium hydroxide, or cement, or clinker, or any combination thereof.

The invention discloses a method for selectively and efficiently removing impurities in desulfurized gypsum and preparing high-quality alpha-semi-hydrated gypsum, which comprises the following steps: (1) removing organic impurities in the desulfurized gypsum by utilizing flotation, then removing soluble impurities by washing, and aerating air to oxidize calcium sulfite into calcium sulfate dihydrate while washing, then carrying out acid leaching in a hydrochloric acid solution to remove insoluble impurities, taking out and drying to obtain treated desulfurized gypsum; and (2) adding the desulfurized gypsum treated in the step (1) into a carboxylic acid aqueous solution to carry out solution crystallization reaction, adding potassium carboxylate into the carboxylic acid aqueous solution to regulate and control the crystallization rate and crystal morphology, carrying out solid-liquid separation after the reaction is finished, and washing, drying and ball-milling the solid to obtain the high-quality alpha-semi-hydrated gypsum powder. The alpha-semi-hydrated gypsum product obtained by the invention is high in purity, and the hydrated body has high absolute dry compressive and flexural strength.

The invention discloses a novel wet flue gas desulfurization composite synergistic additive and a preparation method thereof, and relates to the technical field of flue gas desulfurization. The novel wet flue gas desulfurization composite synergistic additive comprises the following raw materials in parts by weight: 15-25 parts of organic acid, 10-20 parts of organic salt, 5-10 parts of inorganic salt, 4-5 parts of a wetting agent, 5-8 parts of a moisture absorbent and 5-15 parts of an accelerant. The prepared novel wet flue gas desulfurization composite synergistic additive has good calcium carbonate dissolution rate and calcium sulfite oxidation rate, and the desulfurization efficiency is high.

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.

The utility model discloses a kiln flue gas cooling device with a desulfurization and denitrification structure, which is characterized in that a flue gas heat exchanger is mounted on the side surface of a flue gas pipe, and a gas outlet pipe is connected to the side surface of the flue gas heat exchanger; according to the kiln flue gas cooling device with the desulfurization and denitrification structure, a gas outlet pipe can extend through sliding between a fixing plate and a second fixing block, after the gas outlet pipe extends to a designated position, the fixing plate is extruded through threads, so that the gas outlet pipe is fixed, and the length of the gas outlet pipe is adjusted; a gas outlet pipe can be conveniently adjusted according to needs when being connected with a pipeline, a reducing agent in a storage tank is sprayed into a denitration reactor through a denitration spray gun so as to react with nitrate in flue gas, and oxides are selectively reduced into nitrogen and water, so that the flue gas can be denitrated by the device; and finally, limestone is sprayed and wetted through a spray head, and the wet limestone can react to produce calcium sulfite when being in contact with sulfur in the flue gas, so that the environmental protection is further improved.

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 application discloses a magnesium metal reduction slag and limestone wet combined desulfurization process and belongs to the technical field of limestone desulfurization. The preparation method of the magnesium metal reduction slag and low-grade limestone wet combined desulfurization process comprises the following steps: S1, uniformly mixing the magnesium metal reduction slag with water to carry out hydration reaction, preparing a hydrated magnesium slag slurry, uniformly mixing the prepared hydrated magnesium slag slurry with prepared low-grade limestone slurry, and obtaining SO2 absorption liquid; S2, using the SO2 absorption liquid to carry out a desulfurization reaction on flue gas in an absorption tower, generating calcium sulfite, and blowing air into the absorption tower to make the generated calcium sulfite tend to be completely oxidized to obtain calcium sulfate; and S3, slowly cooling the slurry in the absorption tower with cooling water in the desulfurization reaction process, and making the obtained calcium sulfate form gypsum crystals. The desulfurization process has high desulfurization efficiency, little gypsum scale is generated in the desulfurization process, the magnesium metal reduction slag is effectively utilized, and the environment is prevented from being polluted.

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 double-shell calcium carbonate / calcium sulfide loaded biochar adsorbent and its preparation and application, belonging to the technical field of adsorbents. The double-shell calcium carbonate / calcium sulfide loaded biochar adsorbent uses kelp biochar as the core, calcium sulfide as the inner shell layer, and calcium carbonate as the outer shell layer. The preparation method is as follows: pretreat kelp powder with calcium sulfite to obtain pretreated kelp particles; carbonize the pretreated kelp particles to obtain calcium oxide / calcium sulfide loaded biochar; the calcium oxide / calcium sulfide loaded biochar is subjected to two aging treatments to obtain the double-shell calcium carbonate / calcium sulfide loaded biochar adsorbent. The double-shell calcium carbonate / calcium sulfide loaded biochar adsorbent of the invention has the characteristics of easily available raw materials, green, environmental-friendly and convenient preparation method, rich adsorption sites, etc., has a high adsorption capacity for Cd(II), and can be used for the repair of Cd(II)-polluted water bodies.

The present invention relates to the technical field of desulfurized gypsum treatment, and discloses a method for treating arsenic-containing desulfurized gypsum. The method comprises the following steps: (1) successively ball-milling the arsenic-containing desulfurized gypsum and screening it through a 100-mesh sieve; (2) soaking the arsenic-containing desulfurized gypsum in a soaking solution, and then performing solid-liquid separation, wherein the soaking solution contains an acid and a water-soluble organic matter, and the acid is selected from one or more of citric acid, nitric acid, and oxalic acid; (3) reacting the first solid-phase product, an alkaline solution, and a first oxidant, wherein the base in the alkaline solution is ammonia water and / or sodium hydroxide, and the first oxidant is hydrogen peroxide; (4) reacting the second solid-phase product, an acidic solution, and a second oxidant; (5) reacting the third solid-phase product with an organic alcohol solution. This method can effectively remove arsenic in the desulfurized gypsum and simultaneously oxidize calcium sulfite in the desulfurized gypsum.

The invention discloses a method for oxidizing sulfite in desulfurized gypsum in the technical field of sulfite oxidation, which effectively solves the problem of oxidation of calcium sulfite in the desulfurized gypsum by adding carbonate and performing oxidation treatment, realizes recycling of resources and has remarkable environmental benefits and economic benefits.

The invention belongs to the technical field of high-value utilization of non-ferrous metal solid waste, and relates to a method for preparing high-purity vanadyl sulfate through calcification roasting countercurrent leaching extraction.The method comprises the steps that converter vanadium slag serves as a raw material, a calcification agent is added for roasting, and transformed vanadium slag is obtained; secondary countercurrent is conducted on the transformed vanadium slag, calcium sulfite is added in the leaching process, and reduced vanadium-containing acid leaching liquid is obtained; the leaching residues can be used for preparing ferrotitanium alloy products; vanadium and impurities are separated through the extraction circulation process of extraction, washing and reverse extraction, and the high-purity vanadyl sulfate electrolyte is prepared. According to the method, the converter vanadium slag is adopted as a raw material, and high-value utilization of the converter vanadium slag in the field of energy storage is achieved. And meanwhile, resource utilization of leaching residues obtained through secondary countercurrent leaching is achieved, and whole-process harmless treatment is achieved.

The present invention provides an air circulation purification device, which relates to the technical field of air circulation purification. The air circulation purification device includes a wall, a circulation mechanism is provided in the middle of one side of the front end of the wall, a processing mechanism is provided in the middle of the front end of the wall, and a purification mechanism is provided in the middle of the other side of the front end of the wall; the purification mechanism includes an installation box, and automatic injector 2 and automatic injector 1 are provided on both sides of the upper and middle part of the front end of the installation box. The air in the cargo shower room and the air shower room is circulated and purified by a circulation purification method, and during the purification process, dust and impurities in the air are first filtered out by a water curtain dust filter, and then harmful substances in the air exhaust are neutralized by a chemical reaction, thereby generating calcium sulfite that can purify water, thereby reducing the pollution level of the air emissions in the cargo shower room and the air shower room to the surrounding environment.

The intelligent direct drinking water supply and return device comprises a bottom plate, the top of the bottom plate is fixedly connected with a water tank, a sealing inclined plate is fixedly connected between the circumferential inner walls of the water tank, the top of the sealing inclined plate is provided with a filtering cavity, the bottom of the sealing inclined plate is provided with a water storage cavity, and the left end of the sealing inclined plate is provided with a plurality of water outlet holes. A filter plate, an activated carbon filter box, a medical stone filter box and a calcium sulfite filter box are arranged in the filter cavity from right to left. According to the utility model, unused water at each user water taking point flows back through a pipeline, is collected to a floor water return interface and continues to flow back through a water return pipeline, the conductivity is detected through a conductivity probe, and the return water flows into a filter cavity in the water tank through an unqualified water return pipe when the conductivity is unqualified; the filter plate, the activated carbon filter box, the medical stone filter box and the calcium sulfite filter box are used for filtering return water, and then the return water flows into the water storage cavity from the water outlet hole so as to be recycled.

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 utility model discloses a desulfurization water bed with a forced oxidation nozzle structure, which comprises a desulfurization water bed connected with a carbide slag slurry feeding pipeline; the flue gas pipeline is arranged above the desulfurization water bed, and a plurality of flue gas branch pipes are connected to the flue gas pipeline in the length direction of the flue gas pipeline; the forced oxidation spray pipe is transversely arranged in the desulfurization water bed and is positioned below the plurality of flue gas branch pipes, a pipe orifice of the forced oxidation spray pipe extends out of the desulfurization water bed, a plurality of nozzles are mounted on the forced oxidation spray pipe, and the plurality of nozzles are respectively arranged right opposite to pipe orifices at the lower ends of the plurality of flue gas branch pipes; an air outlet of the oxidation fan is connected with a pipe orifice of the forced oxidation spray pipe; and the mechanical stirrer is mounted in the desulfurization water bed and is positioned below the forced oxidation spray pipe. The nozzle can increase oxygen into the desulfurization water bed, and under the action of the mechanical stirrer, the oxygen, the flue gas and the desulfurization agent are fully mixed and react, so that the generation of calcium sulfite can be reduced, and the desulfurization effect can be improved.

The present invention discloses a lime desulfurization variable cement device, which relates to the technical field of cement desulfurization equipment, including a spray tower, a transmission component and a linkage component, wherein a demister is arranged in the spray tower, a scraper is vertically slidably connected in the spray tower, an annular water pipe is rotatably connected in the spray tower, a plurality of nozzles are arranged in a circular array on the annular water pipe, each nozzle is rotatably connected with an atomizing cover, each atomizing cover is provided with a plurality of atomizing holes, the transmission component is driven by the rotation of the annular water pipe to rotate each atomizing cover, and the linkage component is driven by the rotation of the annular water pipe to make the scraper slide vertically up and down. When the invention needs to be cleaned, the annular water pipe is rotated, and each atomizing cover is rotated through the transmission component, so that the water flow sprayed by each nozzle becomes larger, and the inner wall of the spray tower and the demister are washed, and the scraper is moved vertically up and down through the linkage component to scrape off the calcium sulfite scale on the inner wall of the spray tower.

The invention provides a preparation method of high-purity isosulfur blue, which comprises the following steps: by taking 2-chlorobenzaldehyde as a raw material, after sulfonation reaction of fuming sulfuric acid, adding calcium carbonate to convert excessive sulfuric acid into calcium sulfate precipitate, and filtering to remove the calcium sulfate precipitate, thereby reducing inorganic salt residues in an intermediate I; carrying out substitution reaction on the intermediate I under the action of sodium sulfite and sodium hydrogen sulfite, adding a calcium chloride solution after the reaction to enable sulfite to form calcium sulfite precipitate, and carrying out filtration, vacuum concentration and methanol pulping to obtain a high-purity intermediate II; the intermediate II reacts with N, N-diethylaniline to generate an intermediate III, then the intermediate III is oxidized by silver oxide to generate an isosulfur blue silver salt, sodium carbonate is added to directly convert the silver salt into a sodium salt form, and a high-purity isosulfur blue finished product is obtained through ethyl acetate crystallization. According to the method, inorganic salt residues are remarkably reduced, the product purity and yield are improved, meanwhile, the technological process is simplified, the solvent usage amount is reduced, operation is safe and environmentally friendly, and industrial production is facilitated.

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 present application pertains to processes producing oxides using a weak acid intermediate. In one embodiment a material comprising calcium carbonate is reacted with a solution comprising aqueous carboxylic acid to form a gas comprising carbon dioxide and a solution comprising aqueous calcium carboxylate. The solution comprising aqueous calcium carboxylate is reacted with sodium sulfate to form a solution comprising aqueous sodium carboxylate and a solid comprising calcium sulfate. The solution comprising aqueous sodium carboxylate is reacted with sulfur dioxide to form sodium sulfite and an aqueous carboxylic acid. The sodium sulfite is separated from said aqueous carboxylic acid and reacted to form a solid comprising calcium sulfite which is decomposed to form calcium oxide and sulfur dioxide.

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.

The invention belongs to the technical field of artificial soil, and relates to flow-state solidified soil as well as a preparation method and application thereof. The invention provides flow-state solidified soil. The flow-state solidified soil is composed of soil, a flow-state solidifying agent and water according to the mass ratio of 100: (5-20): (10-40), the fluid curing agent is composed of slaked lime, fly ash, zinc oxide, calcium sulfite, a high-molecular compound and a complexing agent according to the mass ratio of (10-20): (10-20): (5-10): (5-10): (20-40): (1-5); the high-molecular compound is selected from at least one of propylene glycol monolaurate, polyacrylamide and hydroxypropyl methyl cellulose; the complexing agent is selected from at least one of EDTA, EGTA and DTPA. The technical problems that when the slaked lime and the fly ash are used for preparing the flow-state solidified soil, a solidified body formed by the slaked lime and the fly ash and the soil is insufficient in anti-collapse capacity, low in early strength and poor in water stability are solved.

The invention provides a method for preparing manganese sulfate from low-grade pyrolusite based on sulfite circulation, a manganese-based material is prepared through the difference of the solubility of sulfite by utilizing the characteristic that the solubility of manganese sulfite is far smaller than that of calcium sulfite and magnesium sulfite, and manganese sulfate widely applied to the battery positive electrode industry is obtained. The by-product sulfur dioxide is used as a reducing agent to leach pyrolusite, the leaching cost is reduced, compared with a pyrite leaching method, the slag yield is reduced, recyclable ammonium sulfite is used as an intermediate manganese precipitation impurity removal agent, compared with an existing high-purity manganese sulfate preparation technology, the method is more efficient, the reagent cost is reduced, the quality of the prepared manganese sulfate is kept at the high-purity level, and the method is suitable for industrial production. The calcium and magnesium impurity removal effect is good, materials are simple, cost is low, recycling of main substances can be achieved, and environment friendliness is achieved.

The present invention relates to the field of post-processing and purification of sulfur oxides, and discloses a method and application for preparing calcium polysulfide using a desulfurization intermediate product from a power plant. The method comprises the following steps: (1) adjusting the pH of the desulfurization intermediate product from the power plant, and then mixing the adjusted product with a reducing agent, a catalyst, an auxiliary agent, and a stabilizer to obtain a slurry; (2) subjecting the slurry to a catalytic reduction reaction to obtain a powder product; (3) boiling and crystallizing the powder product to obtain calcium polysulfide; wherein the desulfurization intermediate product from the power plant contains calcium sulfite. The method provided by the present invention has the characteristics of a short process flow, a small amount of raw materials, a low reaction temperature, and a fast reaction rate. It can also reduce desulfurization costs and reduce solid waste in power plants, and is therefore of great practical value. Moreover, the calcium polysulfide product prepared by the method provided by the present invention has a high recovery rate.