400 results about "Sodium thiocyanate" patented technology

The invention provides a preparation method of a MoS2 / Fe3O4 nano composite material, belonging to the technical field of preparation of nano inorganic functional materials. The preparation method taking Fe3O4 nano particles as the raw material comprises the following specific steps of: dispersing the Fe3O4 nano particles in de-ionized water, adding sodium molybdate, sodium chloride, sodium thiocyanate and a surface active agent CTAB (Cetyltrimethyl Ammonium Bromide), after stirring for a period of time, adjusting pH by using hydrochloric acid, then, pouring the mixture into a stainless steel reaction kettle with a polytetrafluoroethylene liner, and naturally cooling after reacting at the pre-set temperature for a period of time; and centrifugally washing a reaction product by using the de-ionized water for several times, and drying the product to obtain the MoS2 / Fe3O4 nano composite material. The method disclosed by the invention has the advantages of being simple in process, rapid, high-efficiency and the like; MoS2 is well wrapped on the Fe3O4 nano particles; and the MoS2 / Fe3O4 nano composite material prepared by the invention is good in crystallinity, controllable in morphology and size and good in adsorption property.

A method for treating desulfurization waste liquid of a wet oxidation method. The method comprises the following steps: firstly adding a decolorant into desulfurization waste liquid for decolorizing treatment, filtering after decolorization, adding alkali into the filtrate, controlling the PH to be 8-9, performing evaporation concentration under a condition with a negative pressure, condensing the evaporated ammonia gas and water vapor to obtain concentrated ammonia liquor which can be returned to the system for recycle or be used to produce ammonium sulfate, performing fractional crystallization of the concentrated desulfurization liquid to respectively obtain high-purity sodium thiocyanate and sodium hyposulfite. The invention has a simple process, and stable operations, and effectively solves the problem of difficult HPF desulfurization waste liquid treatment in coking enterprises; the method not only reduces the discharge of the waste liquid, but also recovers a lot of chemical products with economic value, and the method has quite significant economic benefits and environmental benefits.

The invention discloses a method for preparing sodium thiocyanate by using desulphurization waste liquid of coke oven gas, and belongs to the technical field of utilization of desulphurization waste liquid of the coke oven gas. The method comprises the following steps: using the desulphurization waste liquid of the coke oven gas as a raw material, firstly, filtering the waste liquid in vacuum, using tributyl phosphate to extract thiocyanate radicals in the waste liquid, then using sodium hydroxide solution to back-extract the extract, and finally concentrating and crystallizing the extract, and washing and drying the crystals to obtain sodium thiocyanate crystals. The method uses the desulphurization waste liquid of the coke oven gas to prepare a sodium thiocyanate product with the purity as high as 93 to 95 percent so as to change waste into valuable and makes full use of waste resources; and the method is simple, saves energy, has no three-waste discharge, is favorable for environmental protection, has low production cost and good economic benefit, and develops a new path for the utilization of the desulphurization waste liquid resources of the coke oven gas. The sodium thiocyanate product prepared by the method can be widely applied in the industries of medicaments, textile, printing and dyeing, pesticide, chemistry and the like.

The invention relates to a treatment method of industrial wastewater, in particular to a treatment method of two-step wet acrylic fiber production wastewater. The method comprises the following steps of: a, flocculent settling treatment with a composite flocculating agent for removing compounds of nitrile, amine, cyanogen and the like harmful to organisms, preventing the compounds from adhering and poisoning microbes, removing suspension and colloidal chemical oxygen demand (COD) and lightening the load of a biochemical system; b, aerobic biochemical treatment for degrading organic substancesin the wastewater and removing COD; c, Fenton oxidation deep treatment for oxidizing and decomposing residual organic substances and further removing COD; and d, neutralizing treatment, wherein the produced water after the neutralizing treatment reaches the standards and is discharged or is recycled to the production process. After being treated by the treatment method of the two-step wet acrylicfiber production wastewater, the appearance of the two-step wet acrylic fiber production wastewater is colorless and transparent, the COD removal rate is improved by about 10 to 20 percent compared with a method in the prior art, the COD of the produced water is less than 160mg / L, the treated two-step wet acrylic fiber production wastewater reaches the national grade 1 discharge standard of the acrylic fiber industry, and acrylonitrile and sodium thiocyanate in the produced water are lower than the detection limit.

The invention relates to metal oxide semiconductor 2 (MoS2), in particular to a graphene / MoS2 nano self-lubricating composite material and a preparation method thereof. The composite material is prepared through the following steps that: graphene oxide nanosheets are placed into mixed solution which is formed by molybdate, sodium thiocyanate, sodium chloride and deionized water to obtain mixed solution 1, the pH value of the mixed solution 1 is adjusted through hydrogen chloride (HCl) and sodium hydroxide (NaOH) to 1 to 6, the mixed solution 1 is transferred to a hydrothermal reactor which is lined with polytetrafluoroethylene after being ultrasonically treated and uniformly mixed, the mixed solution 1 has hydrothermal reaction under 180 to 200 DEG C after the reactor is well sealed, products are centrifuged and collected after 24 to 48 hours, the products are washed by the deionized water and the absolute ethyl alcohol, and the dried products are heat treated for 2 hours under 800 to 900 DEG C under the protection of the nitrogen (N2) / hydrogen (H2) atmosphere to obtain the graphene / MoS2 nano self-lubricating composite material.

A process for preparing the nanoparticles modified antistatic polyacrylonitrile fibres features that the nano-class metallic oxide as antistatic substance is dispersed in the aqueous solution of polyacrylonitrile solvent containing sodium thiocyanate and N, N-dimethylformamide or dimethyl sulfoxide, and the resultant emulsion is used the solidifying bath prestretching bath, preheating bath, hot stretching bath, or spinning bath before the polyacrylonitrile fibre is spun. Its advantages are excellent antistatic performance and high mechanical property.

At least one of the following compounds is applied as a re-wet solution to media: potassium iodide, sodium iodide, sodium thiosulfate, potassium thiosulfate, and sodium thiocyanate. The addition of at least one of these compounds to the re-wet solution can improve light fastness on the order of eight to thirteen times or more on porous glossy media. These additives are particularly effective with water-soluble dyes, including dyes such as Reactive Black 31 (Pacified) (RB31), Direct Blue 199 (DB199), Magenta 377 (M377), and Direct Yellow 132 (DY132).

This invention discloses a metal cleaning agent with high effect and multi-functions, which uses phosphoric acid and zinc oxide as A material, water, tripoly phosphate, thiourea, and uses tartaric acid, C6H12N4, butanone, thiocyanic acid natrium, triethanolamine, fluorin sodium metasilicate, hydrofluoric acid, lemon acid, nitrous acid natrium, op-10, JFC and alcohol as B material, the main character is that after A material is mixed by a certain weight ratio, it combines B material with a certain weight ratio. This invention combines oil removing, dirty removing, rust preventing, deactivation, inhibiting, phosphate 8 in 1 functions together, which has well cleaning effect, and the work surface quality is high, the dealing technology is simple, the cost is lower.

The invention relates to a cement grinding aid and a preparation field thereof, in particular to a cement grinding aid and a preparation method thereof. The cement grinding aid is prepared from, by weight, 10%-20% of alcohol amine compounds, 1%-5% of molasses, 0.5%-3% of sodium sulfate, 5%-15% of sodium chloride, 10%-20% of sodium thiocyanate and 50%-60% of water. The cement grinding aid has the advantages of being lower in comprehensive cost, low in chlorine ion content, good in effect of enhancing strength of cement at the early stage and the later stage and excellent in aid-grinding enhancing capacity on cement; the preparation method has the advantages of being simple in production process, convenient to operate and high in production efficiency.

A flame-retardant UV curing coating is prepared from the following raw materials in part by weight: 10-12 parts of trimethylol propane triacrylate, 50-55 parts of polyester acrylate, 3-5 parts of isopropanol, 5-8 parts of ethoxylated trimethylolpropane triacrylate, 1-2 parts of tetrabutylphosphonium chloride, 2-3 parts of sodium thiocyanate, 2-6 parts of hexabromocyclododecane, 3-4 parts of diethylene glycol butyl ether, -5 parts of benzil dimethyl ketal, 2-3 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone, 3-4 parts of dispersing auxiliary agent and 4-5 parts of dispersing auxiliary agent. The flame-retardant UV curing coating has excellent chemical resistance and low temperature resistance, and has strong adhesion to difficultly-adhered substrates, such as plastic; after addition of the dispersing auxiliary agents, the flame-retardant UV curing coating is good in leveling property, can form a uniform and thin coating layer, and is high in curing speed; and by adding tetrabutylphosphonium chloride and the hexabromocyclododecane, the flame-retardant UV curing coating has excellent flame retardance.

An improved method of preserving a molecule in a bodily fluid comprises: (1) providing a preservative solution comprising: (a) an amount of a divalent metal chelator selected from the group consisting of ethylenediaminetetraacetic acid (EDTA), (ethylenebis(oxyethylenenitrilo))tetraacetic acid (EGTA), and 1,2-bis(2-aminophenoxy)ethane-N,N,N′,N′-tetraacetic acid (BAPTA) and salts thereof in the range of from about 0.001 M to about 2 M; and (b) an amount of at least one chelator enhancing component selected from the group consisting of lithium chloride, guanidinium chloride, guanidinium thiocyanate, sodium salicylate, sodium perchlorate, and sodium thiocyanate in the range of from about 0.1 M to about 10 M; and (2) adding the preservative solution to the bodily fluid, thus preserving the molecule. The molecule can be a protein or a small molecule, such as a steroid. The invention also encompasses preservative compositions suitable for preserving proteins or small molecules, and kits. Preservative compositions can further include at least one enzyme inactivating component selected from the group consisting of manganese chloride, sarkosyl, and sodium dodecyl sulfate in the range of up to about 5% molar concentration. Compositions and methods according to the present invention have many diagnostic and forensic uses, in addition to being suitable for preparing compositions usable by hunters for attracting animals.

The invention discloses black water-based color paste for acrylic stock solution coloring, and a preparation method of the black water-based color paste. The black water-based color paste prepared by the method takes carbon black after oxidation treatment as a pigment, the disadvantage of poor surface hydrophilicity of the common carbon black is avoided, a butyl sodium naphthalene sulfonate salt and 2-naphthalene sulfonic acid methanal polymer sodium salt composite dispersing agent system is used cooperatively, and a pigment surface treating agent, a cosolvent, sodium thiocyanate, bactericide and deionized water are taken as common ingredients, wherein the dispersing agent is mixed by butyl sodium naphthalene sulfonate salt and 2-naphthalene sulfonic acid methanal polymer sodium salt at a mass ratio of 1:(2-5). The obtained black water-based color paste for the acrylic stock solution coloring has the characteristics of small particle size and high stability in an acrylic spinning stock solution, and blocking of a spinneret orifice and greater chromatic aberration do not appear in a spinning process.

The present invention discloses an emulsion gel based polyacrylonitrile / carbon porous material and a preparation method thereof. The method comprises the following steps: with emulsion gel as a template, dissolving polyacrylonitrile in a salt solution of zinc chloride or sodium thiocyanate, then adding a water-soluble monomer, an initiator, a crosslinking agent and an emulsifier into the obtained solution, carrying out uniform dispersing, then adding an oil phase, and carrying out emulsification so as to prepare an emulsion; and placing the emulsion at a certain temperature, allowing the water-soluble monomer in a continuous phase to polymerize so as to prepare the emulsion gel, then placing the emulsion gel into deionized water, carrying out soaking, removing salt in the continuous phase, carrying out freeze drying so as to prepare a polyacrylonitrile porous material, and carrying out cyclization and carbonization so as to prepare a porous material. The preparation method provided by the invention has the advantages of simple preparation process, cheap raw materials and mild preparation conditions; meanwhile, the prepared polyacrylonitrile / carbon porous material has the advantages of low density, high porosity, large specific surface area, good connectivity of internal pores, etc., and has potential application prospects in the fields of catalyst carriers, oil-water separation, etc.

The invention discloses a harmless treatment method for a sodium alkali desulfurization waste solution. The method comprises: the desulfurization waste solution is adjusted in pH value by sulfuric acid and is filtered and pre-treated; then hydrogen peroxide is added to be uniformly mixed and oxygen is blown; wet oxidation reaction is carried out at high temperature and high pressure; sodium sulfite and elemental sulfur in the desulfurization waste solution are oxidized to sodium sulfate, organic matters are oxidized to carbon dioxide and water, and sodium thiocyanate is not oxidized and is continuously retained in the desulfurization waste solution; after reaction, the desulfurization waste solution is settled and separated to obtain solid sodium sulfate and a clean liquid, wherein the clean liquid is fed to a spraying drier for vacuum spraying and drying; water vapor generated by drying is condensed and fed to a biochemical treatment workshop section of an enterprise to be treated so as to obtain the solid which is mixed salt of sodium sulfate and sodium thiocyanate; and the mixed salt is evaporated and crystalized or extracted and crystalized by virtue of an organic solvent to obtain sodium sulfate and sodium thiocyanate, respectively. The method is simple in process, and chemical products with economical benefits are recovered while the waste solution is treated, so that harmless treatment for the sodium alkali desulfurization waste solution is realized.

A two-step process using sodium thiocyanate as solvent for treating the sewage generated by west spinning of acrylic fibres includes microelectrolyzing to degrade oligomer, adding flocculant, coagulating while depositing, separation, mixing the polymerized sewage with cyanogen contained sewage, homogenizing, hydrolyzing, acidifying, carbonifying, nitrating, denitrating, post-aerating, and separating the deposit mud from supernatant. Its advantage is high treating effect.

The invention relates to a method for extracting sodium thiocyanate from desulfurization waste liquid in a coking plant, which is characterized by comprising the following steps of: adding 2 to 6 weight percent of activated carbon into the desulfurization waste liquid, heating to the temperature of between 70 and 90 DEG C, and keeping stirring for 1 to 2 hours; filtering, adding sulfuric acid into filtrate in a closed container until pH is 3.5 to 4.5, heating to the temperature of between 60 and 80 DEG C, and keeping stirring for 1 to 2 hours; leading escaping sulfur dioxide gas out by using a guide pipe and absorbing by using dilute ammonia water; filtering after reaction is finished, adding sodium hydroxide with the same mol as ammonium thiocyanate in filtrate and calcium hydroxide with the same mol as ammonium sulfate in the filtrate into the filtrate in the closed container, heating to the temperature of between 50 and 70 DEG C, and keeping stirring for 1 to 2 hours; and leading escaping ammonia gas out by using the guide pipe and absorbing by using water to obtain the dilute ammonia water, filtering after reaction is finished, and performing evaporation crystallization on filtrate to obtain a sodium thiocyanate product.

The invention relates to a method for improving the purity of sodium thiocyanate in a coking and desulfurizing waste liquid, which comprises the following sequential steps: (1) pretreating; (2) decoloring and removing impurities; (3) performing primary concentrating crystallization; (4) performing extraction separation; (5) performing secondary concentrating crystallization; and (6) washing, and drying, wherein the sodium thiocyanate product obtained after drying has a purity of 98% or above. According to the invention, the extraction method is simple and convenient to operate, and the salt content in a desulfurizing and decyanation waste liquid generated in a PDS desulfurizing production process of a coke-oven plant is effectively extracted and separated, so that the high-purity sodium thiocyanate product is extracted through concentrating crystallization; and the discharge of waste water from the coke-oven plant and environmental pollution are reduced, the high-purity high-added-value chemical raw material is recovered at the same time, and economic benefits of the enterprise are increased.

A high-performance soloution for chemical plating of Ni-P alloy contains primary salt (nickel sulfate and sodium hypophosphite), composite complexing agent (complexon, citric acid, lactic acid, sterculic acid and butanedioic acid), composite buffer (boric acid and sodium acetate), and composite stabilizer (sodium thiocyanate, ammonium mobybdenate and lead nitrate). Its advantages are high stability and high anticorrosion performance of its plated layer; and the plated layer can be applied with secondary plating.

An improved method of preserving a molecule in a bodily fluid comprises: (1) providing a preservative solution comprising: (a) an amount of a divalent metal chelator selected from the group consisting of ethylenediaminetetraacetic acid (EDTA), (ethylenebis(oxyethylenenitrilo))tetraacetic acid (EGTA), and 1,2-bis(2-aminophenoxy)ethane-N,N,N′,N′-tetraacetic acid (BAPTA) and salts thereof in the range of from about 0.001 M to about 2 M; and (b) an amount of at least one chelator enhancing component selected from the group consisting of lithium chloride, guanidinium chloride, guanidinium thiocyanate, sodium salicylate, sodium perchlorate, and sodium thiocyanate in the range of from about 0.1 M to about 10 M; and (2) adding the preservative solution to the bodily fluid, thus preserving the molecule. The molecule can be a protein or a small molecule, such as a steroid. The invention also encompasses preservative compositions suitable for preserving proteins or small molecules, and kits. Preservative compositions can further include at least one enzyme inactivating component selected from the group consisting of manganese chloride, sarkosyl, and sodium dodecyl sulfate in the range of up to about 5% molar concentration. Compositions and methods according to the present invention have many diagnostic and forensic uses, in addition to being suitable for preparing compositions usable by hunters for attracting animals.

The invention relates to a preparation method of a bismuth sulfide / bismuth molybdenum oxide heterojunction photocatalytic composite material. The preparation method is characterized by comprising the steps of dispersing BiOBr micro-sphere particles in de-ionized water in a proportion of 7.7g / L, and uniformly stirring; adding a molybdenum source: sodium molybdate, sodium chloride, sodium thiocyanate and a surfactant to a solution (1) and stirring for 30-60min; regulating pH value of the solution to be acid through hydrochloric acid; pouring the mixed solution into a stainless steel reaction kettle, and reacting for 24-48 hours at 150-200 DEG C; after reaction, naturally cooling, centrifuging and washing a reaction product for times through de-ionized water and ethanol, and drying the product to obtain the Bi2S3 / Bi2MoO6 heterojunction composite material. The preparation method is simple and convenient to operate and is low in reaction temperature, and the prepared composite material is excellent in photocatalytic performance.

At least one of the following compounds is included on a surface layer of a print medium and in an inkjet ink formulation to be printed thereon: potassium iodide, sodium iodide, sodium thiosulfate, potassium thiosulfate, and sodium thiocyanate. The addition of at least one of these compounds to both the print medium and the inkjet ink can improve light fastness on the order of eight to thirteen times or more on porous glossy media. These additives are particularly effective with water-soluble dyes, including such dyes as Reactive Black 31 (Pacified) (RB31), Direct Blue 199 (DB199), Magenta 377 (M377), and Direct Yellow 132 (DY132).

The invention relates to a two phase stainless steel, which comprises the following chemical components in weight percent: 0 to 0.12 percent of C, 4.0 to 8.0 percent of Mn, 12.0 to 25.0 percent of Cr, 0.20 to 1.5 percent of Al, 0.5 to 3.0 percent of Ni, 0.4 to 3.0 percent of Mo, 0 to 1.0 percent of Cu, 0.2 to 2.5 percent of Si, 0.05 to 0.3 percent of N, 0.02 to 0.05 percent of Re, less than or equal to 0.03 percent of S, less than or equal to 0.035 percent of P, and the balance being Fe. The two phase stainless steel has the advantages of high strength, good toughness, excellent wear resistance and corrosion resistance, in particular the superiorities of stress corrosion cracking resistance, complete corrosion resistance, intergranular corrosion resistance, and pitting corrosion resistance and vacuole corrosion resistance in sea water in solutions such as strong base (such as NaOH), chlor-alkali (NH4Cl), oxidizing acid (such as HNO3), sodium thiocyanate, phosphate solution, good hot and cold processability, and low cost.

The invention relates to a method for producing anti-pilling acrylic fiber by taking polyacrylonitrile as spinning raw material and sodium thiocyanate solution as the spinning solvent. The method for producing anti-pilling acrylic fiber comprises the following steps: (1) forming spinning solution into primary fiber with a spinneret assembly in coagulating bath; (2) heating to stretch the primary fiber by steps at 95-99 DEG C by 5.0-8.5 times; (3) eluting the primary fiber with hot water; (4) heating, drying and densifying the primary fiber in the tensing state with hot air: (5) post-heating to stretch the primary fiber at 110-140 DEG C by 1.0-2.5 times; (6) curling the primary fiber and thermoforming the primary fiber at 10-120 DEG C; and (7) oiling and cutting off the primary fiber to obtain the product of anti-pilling acrylic fiber. The product of anti-pilling acrylic fiber is produced with the process for producing acrylic fiber in one step by taking sodium thiocyanate solution as the spinning solvent, and the product of anti-pilling acrylic fiber has very excellent anti-pilling performance and other various physical performance indexes.

The invention relates to a preparation method of durable low-smoke halogen-free flame-retardant polyacrylonitrile fiber. The preparation method of durable low-smoke halogen-free flame-retardant polyacrylonitrile fiber is characterized by comprising the following steps: 1) blending spinning solution preparation: based on the mass parts of the polyacrylonitrile powder and the phosphorus-containing flame retardant, dissolving 65-80 parts of polyacrylonitrile powder and 20-35 parts of phosphorus-containing flame retardant into a 50-52wt% sodium thiocyanate aqueous solution, and mixing to obtain the blending spinning solution, wherein the ratio of the total mass of the polyacrylonitrile powder and the phosphorus-containing flame retardant to the mass of the 50-52wt% sodium thiocyanate aqueous solution is (10-15):100; 2) wet spinning; and 3) irradiation: irradiating primary flame-retardant polyacrylonitrile fiber in an electron beam accelerator with 0.5-5MeV or a <60>Co device to obtain thedurable low-smoke halogen-free flame-retardant polyacrylonitrile fiber, wherein the irradiation dose is 20-50kGy. The fiber prepared by using the method has good flame-retardant durability and small smoke generation property.

The invention discloses a method for preparing high-quality sodium thiocyanate from a desulfurized and decyanated waste liquid of coke oven gas, which comprises the following steps: decolorizing and filtering the desulfurized and decyanated waste liquid through activated carbon, and adding an assistant A into the waste liquid while stirring, wherein the specific quantity of the assistant A is 50-200% of the molal quantity of sodium thiosulfate in the waste liquid; removing sodium thiosulfate ions in the waste liquid system, filtering to remove insoluble substances, and then adding a small quantity of assistant C into the filtrate to regulate the pH value to 5-10; distilling and concentrating to remove the moisture, and centrifuging to separate out inorganic salt impurities based on the difference of various substances in solubility under different temperatures and concentrations; and decolorizing through activated carbon, and further concentrating and crystallizing to produce the sodium thiocyanate finished product. According to the invention, the process is simple, the cost is low, and the weight content of the produced potassium thiocyanate is more than 99%.

The invention provides a method for preparing erythromycin thiocyanate. The method comprises the following steps of: removing impurities from erythromycin fermentation liquor, and treating by using alkaline liquor; and extracting by using butyl acetate, collecting an organic phase, adding a sodium thiocyanate solution into the organic phase, controlling the pH value to be 4.0 to 6.0, stirring, crystallizing and drying to obtain erythromycin thiocyanate powder. According to the method, the erythromycin fermentation liquor is used as a raw material, and the refined erythromycin thiocyanate is obtained by impurity removal and a mode of combining extraction and the salifying of sodium thiocyanate. The method is easy to operate and low in cost, the requirement of mass production can be met, and a product is high in yield and purity.

The invention relates to a technical formula of black chemical oxidation of a stainless steel. The technical formula comprises the following components in terms of g / L: 450-550 of sodium hydroxide, 8-15 of sodium chloride, 45-55 of sodium thiosulfate, 90-110 of sodium thiocyanate, 2-5 of potassium permanganate and 5-8 of ammonium molybdate. The technical formula has the advantages of wide temperature range, high film-forming speed and short oxidation time, wide color, good film layer property and high efficiency, the color is easily controlled and the film does not fade; after potassium permanganate and ammonium molybdate are added, the film layer is thick and has good brightness and the neutral salt spray test in 96 hours can be ensured; and since no pollutants such as chromic anhydride are added, the less environmental pollution is caused.

The invention discloses a device and a method for extracting refined salt from waste liquid generated during wet ISS-J desulfurization. The device comprises a coarse salt drying assembly, a sodium thiocyanate separating and refining assembly, a sodium thiosulfate separating and refining assembly, a sodium sulfate separating and refining assembly and a solvent recycling assembly. The coarse salt drying assembly comprises a desulfurization waste liquid tank, a heat exchanger, an evaporation kettle, a crystallization kettle and a centrifugal machine; the sodium thiocyanate separating and refining assembly comprises a dissolving kettle, a filter-press kettle, an evaporation kettle, a crystallization kettle, a centrifugal machine, a drying machine and a packaging machine; the sodium thiosulfate separating and refining assembly comprises a dissolving kettle, a condensate tank, a filter-press kettle, a crystallization kettle, a centrifugal machine and a packaging machine; the sodium sulfate separating and refining assembly comprises a dissolving kettle, a concentrate sulfuric acid elevated tank, an evaporation kettle, a centrifugal machine, a drying machine and a packaging machine. The device and the method have the advantages that the waste liquid which can originally pollute environments and is generated by desulfurization systems can be thoroughly treated by the aid of the device and the method, industrial-grade products can be produced from the waste liquid, accordingly, wastewater emission can be truly prevented, and waste can be truly turned into wealth.

The invention provides a composite efficient water reducer and a preparation method thereof. The composite efficient water reducer is prepared from the following components in percentage by weight: 0 to 50 percent of polycarboxylic type water-reducer, 0 to 50 percent of naphthalene-based superplasticizer, 0 to 50 percent of melamine resin water reducer, 0 to 50 percent of aliphatic water reducer, 10 to 50 percent of lignosulfonate, 0 to 50 percent of sulfamate water reducer, 0.1 to 5 percent of sodium gluconate, 0.1 to 5 percent of lauryl sodium sulfate, 0.1 to 10 percent of sodium silicate, 0.1 to 10 percent of potassium methyl silicate, 0.1 to 10 percent of sodium thiocyanate, 0.1 to 10 percent of sodium metaphosphate, 0.1 to 10 percent of triethanolamine, 0.1 to 10 percent of potassium peroxodisulfate and 10 to 65 percent of water. The composite efficient water reducer has the advantages of wide raw material source, simple production method, high production efficiency, remarkable use effect, wide application and suitability for industrial large-scale production.

The invention belongs to the technical field of building materials and relates to an enhanced admixture for a municipal refuse recycled concrete as well as a preparation method thereof and the application thereof. The enhanced admixture comprises the following functional components for water reduction, enhancement, impurity shielding and the like in percentage by weight: 0-50% of polycarboxylic acid water reducer, 0-50% of highly efficient naphthalene water reducer, 0-50% of melamine resin water reducer, 0-50% of highly efficient aliphatic water reducer, 10-50% of lignosulfonate, 0.1-5% of sodium gluconate, 0.1-5% of sodium dodecyl sulfate, 0.1-10% of sodium silicate, 0.1-10% of potassium methyl silicate, 0.1-10% of sodium thiocyanate, 0.1-10% of sodium metaphosphate and 10-65% of water. In addition, the invention further discloses the preparation method and the application of the enhanced admixture. The enhanced admixture for the municipal refuse recycled concrete, provided by the invention, has the advantages of wide raw material source, simple production method, high production efficiency and obvious use effect and is suitable for large-scale industrial production.