539 results about "Sodium sulphide" patented technology

The invention provides a gold leaching agent for treating high-carbon gold-bearing minerals and a gold leaching process, and belongs to the technical field of hydrometallurgy. According to the gold leaching agent, guanidinium thiocyanate is used as an agent main body, a hydroximic acid compound is used as a complexing synergist, and soluble inorganic salt of ferric iron is used as a competitive adsorbent. In a leaching system, guanidine thiocyanate can be decomposed to generate guanidine, sodium sulfide, sodium thiocyanate and water. Thiourea anions are converted into cyanamide under the alkaline condition, then cyanamide is slowly released and decomposed into cyanide ions, the cyanide ions are complexed with gold ions, and gold leaching is achieved. Namely, guanidinium thiocyanate has the effect of releasing the cyanide ions step by step, and slow release of the cyanide ions is realized. The gold leaching agent system does not contain cyanide (sodium cyanide, potassium cyanide and the like) and is a clean and environment-friendly agent system, and efficient leaching of gold in high-carbon gold-bearing minerals can be achieved through the synergistic effect of all functional agent components.

The invention belongs to the technical field of electrochemical energy storage, and relates to a nitrogen-doped MXene loaded VCo double-monatomic catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: adding a nitrogen-containing precursor into at least one layer of MXene suspension, and uniformly stirring to obtain a suspension; respectively dissolving a cobalt-containing compound and a vanadium-containing compound in water to prepare a cobalt-containing compound solution and a vanadium-containing compound solution, adding the cobalt-containing compound solution and the vanadium-containing compound solution into the suspension, and performing stirring, ultrasonic treatment and crushing to obtain a mixed solution; freeze-drying the mixed solution to obtain a precursor; and carrying out heat treatment on the precursor, and washing, centrifuging and drying the obtained powder to obtain the nitrogen-doped MXene loaded VCo double-monatomic catalyst. According to the invention, VCo double monatomic atoms are anchored on the surface of the few-layer MXene, so that the MXene serving as a sulfur carrier of the room-temperature sodium-sulfur battery can effectively adsorb and catalyze conversion of sodium polysulfide, and the room-temperature sodium-sulfur battery with excellent cycle life and capacity is obtained.

The invention relates to the technical field of water treatment fluorine removal agent production, in particular to a water treatment fluorine removal agent and a preparation method and application thereof. Specific raw materials are added and reasonable treatment steps are adopted for the wastewater containing fluorine, copper and iron ions generated in the semiconductor chip manufacturing etching process, so that the fluorine ions can be effectively removed; the method can remove copper and iron ions or reduce the influence of the copper and iron ions on fluorine removal (especially wastewater simply treated by sodium sulfide which is specially used for removing copper and iron ions), and has strong pertinence and applicability to etching wastewater with specific water quality; the method is good in collaboration, has both operability and flexibility, and ensures the treatment effect.

The invention discloses low-VOC (volatile organic compound) environment-friendly end-capped mercapto silane as well as a preparation method and application thereof.The preparation method comprises the following steps: by taking chloroalkyl trialkoxysilane and linear alkyl polyether alcohol as raw materials, reacting to form an intermediate c; reacting alkyl acyl chloride with sodium sulfide or sodium hydrosulfide to form an intermediate e; and reacting the intermediate c with the intermediate e to obtain a final product. Silane is used as a rubber auxiliary agent, so that the volatilization amount of alcohols in the internal mixing process of a rubber compound can be greatly reduced, the emission amount of VOC during operation is reduced, meanwhile, the vulcanization performance of a rubber material can be improved, the scorching time of the rubber material can be prolonged, the reinforcing effect of vulcanized rubber can be improved, the physical and mechanical properties of the vulcanized rubber can be improved, and the wet skid resistance of tread rubber can be improved; therefore, the environment-friendly rubber auxiliary agent is a multifunctional environment-friendly rubber auxiliary agent.

The invention discloses an arsenic removal method for purifying waste acid, and belongs to the technical field of sulfuric acid preparation. The method comprises the following steps: settling wastewater, and carrying out filter pressing on slurry through a first filter press; in the first-stage reaction tank, the waste acid reacts with a desulfurizing agent from a sodium hydrosulfide preparation tank, and after the reaction is completed, the waste acid is sent to a first-stage FBL filter to be filtered; in the second-stage reaction tank, the waste acid reacts with a desulfurizing agent from the sodium hydrosulfide preparation tank, and after the reaction is completed, the waste acid is sent to a second-stage FBL filter to be filtered; the filtrate of the second-stage FBL filter is sent to a dynamic wave scrubber for recycling; a flocculating agent is added into the first-stage FBL filter and the second-stage FBL filter; tail gas of the first-stage reaction tank, the first-stage FBL filter, the second-stage reaction tank, the first-stage FBL filter and the sodium hydrosulfide preparation tank is sent to a spray tower, washing liquid containing sodium hydrosulfide and sodium sulfide in the spray tower is sent to the sodium hydrosulfide preparation tank, and sodium hydrosulfide solids are added into the sodium hydrosulfide preparation tank.

The invention relates to the technical field of sewage treatment, in particular to a wastewater recycling method which comprises the following steps: cyanide breaking: in an alkaline environment, adding an oxidizing agent to oxidize wastewater; first monitoring: monitoring the oxidation reduction potential and the free cyanide concentration in real time, and adjusting the adding proportion of sodium hypochlorite based on the ORP dynamic range and the cyanide concentration attenuation rate; precipitation: adding hydroxide, and carrying out heavy metal precipitation; second monitoring: acquiring component information in the sewage, and adding sodium hydroxide and sodium sulfide in a gradient compensation manner after triggering judgment; membrane treatment: performing filtration and degradation treatment through a biological membrane; 3, monitoring: dynamically adjusting the aeration intensity and the backwashing period according to the coupling relationship between the pressure difference slope and the sludge concentration; and 4, monitoring: calculating a process capability index, judging whether the process capability index is smaller than a third threshold value, and if so, adjusting the sodium sulfide dosage in the precipitation stage. The method has the effect of reducing resource waste in the wastewater treatment process.

The invention discloses a method for comprehensively recovering lithium beryllium resources in spodumene tailings, and belongs to the technical field of mineral separation. The method comprises the steps that after spodumene tailings are subjected to size mixing, amine and fatty acid serve as a combined collecting agent, flotation I is conducted, and mica concentrate and tailings I are obtained; after size mixing is conducted on the tailings I, sodium sulfide and phosphate serve as a combined inhibitor, a metal-hydroximic acid organic complex and fatty acid serve as a combined collecting agent, flotation II is conducted, and lithium beryllium bulk concentrate and tailings II are obtained; and after size mixing is conducted on the lithium beryllium bulk concentrate, flotation III is conducted with phosphate and EDTA as a combined inhibitor and fatty acid as a collecting agent, and beryllium concentrate and lithium-containing tailings are obtained. By means of the method, the beryllium concentrate with the BeO grade being 4.448% and the recovery rate being 64% can be obtained, meanwhile, the lithium concentrate with the Li2O grade being 4.8% and the recovery rate being 57.6% can be produced, deep comprehensive recovery of the lithium beryllium resources in the spodumene tailings is effectively achieved, and the economic benefit capacity is large.

The utility model discloses a wet-process phosphoric acid purification and arsenic removal system, and relates to the technical field of wet-process phosphoric acid purification and impurity removal. The system comprises a phosphoric acid raw material tank, a Venturi jet reactor, a tubular washing absorber, a reaction washing curing tank and a hydrogen sulfide reactor which are sequentially connected, wherein the hydrogen sulfide reactor is also communicated with the Venturi jet reactor; the reaction washing and curing tank is communicated with an arsenic removal filtering assembly; and the arsenic removal filtering assembly is communicated with the phosphoric acid raw material tank. The problems that an existing arsenic removal system is large in sodium sulfide adding amount, hydrogen sulfide leakage is prone to occurring, the system is complex, and the arsenic index is difficult to control flexibly are solved.

The invention relates to the technical field of denitrification fillers, in particular to an autotrophic denitrification filler for denitrification and a preparation method thereof. The autotrophic denitrification filler comprises the following raw materials in parts by weight: 80-100 parts of sulfur powder, 8-12 parts of zinc carbonate powder, 8-12 parts of clay, 4-6 parts of ferric oxide, 4-6 parts of polyhydroxyalkanoate, 4-6 parts of sugarcane cellulose, 1-3 parts of cotton, 1-3 parts of a binder and 1-3 parts of a cross-linking agent. According to the method, in the high-frequency ultrasonic treatment, the sulfur powder and sodium sulfide are in non-uniform contact, so that non-uniform sunken dissolving positions can be generated on the surface of the sulfur powder, the specific surface area of the sulfur powder is effectively increased, and after the sulfur powder is used as a main raw material to prepare the filler, the filler has a relatively large contact reaction area with sewage; a good attachment and growth environment is provided for denitrifying bacteria, and the purification effect of the autotrophic denitrification filler for denitrification is improved.

The invention relates to the technical field of resource recycling of manganese-containing wastewater, in particular to a process for preparing industrial-grade manganese carbonate by using a recycled manganese chloride solution, which adopts a two-stage purification and impurity removal strategy, performs primary purification and impurity removal by using sodium sulfide and sodium fluoride, and performs secondary impurity removal by using iminodiacetic acid grafted chelating resin. According to the invention, the problems of poor adaptability and incomplete impurity removal of the manganese chloride solution in the prior art are solved, the purity of the product is obviously improved so as to meet the requirements of the industrial grade manganese carbonate, and the process flow is simple.

The present disclosure provides a polymetallic-ore beneficiation and separation reagent, a preparation method therefor and use thereof. The preparation method for a polymetallic-ore beneficiation and separation reagent, includes following steps: (1) mixing a substance A, caustic soda, soda ash and sodium polysulfide, and then heating the same and performing a catalytic reaction, to render an intermediate product B, wherein the substance A includes one or more of urea, glycine, urea peroxide, ammonium cyanate and isocyanic acid; and (2) mixing the intermediate product B with trichloroisocyanuric acid, dichloroisocyanuric acid and 2-amino-3-(4-imidazolyl)propanoic acid, to render the polymetallic-ore beneficiation and separation reagent.

The invention provides a process for preparing high-purity lithium sulfide based on industrial waste salt recycling, which comprises the following steps: S1, mixing sulfur-containing waste salt and a waste carbon material, granulating, reducing, calcining, separating and purifying to obtain solid sodium sulfide; s2, mixing and ball-milling the obtained solid sodium sulfide and lithium chloride, adding a mixture of a catalyst and ethanol, and performing catalytic reaction to obtain a lithium sulfide crude product; and S3, purifying and drying the obtained lithium sulfide crude product to obtain the lithium sulfide. The method not only can break through the bottleneck of the existing production route, but also can realize the strategic direction of high-value utilization of bulk solid wastes, and has far-reaching significance for promoting sustainable development and green transformation of the battery industry.

The invention belongs to the technical field of new energy materials, and discloses a sodium manganese sulfate sulfuration impurity removal method, which is divided into two stages of sulfuration, the first stage is that sodium sulfide reacts with manganese sulfate, the pH value is controlled to be 5-6, the second stage is that a small amount of sodium sulfide is added for continuous sulfuration, the pH value is controlled to be stabilized at 6.4-7.0, and the content of calcium, magnesium and other impurities in manganese sulfate is reduced as much as possible through secondary sulfuration. And the generated manganese sulfide is treated in the later stage to obtain manganese sulfate with low content of impurities such as calcium and magnesium. The quality of the refined manganese sulfate solution is improved by using a simple process, the impurity content is reduced, and the quality stability of the manganese sulfate product is improved, so that the market competitiveness of the high-purity manganese sulfate product is improved.

The invention relates to the technical field of catalyst processing, and discloses a high-activity transition metal phosphide electrolyzed water catalyst and a preparation method thereof, and the high-activity transition metal phosphide electrolyzed water catalyst comprises the following components by weight: 1-3 parts of cobalt chloride hexahydrate; 0.5 to 1.5 parts of ruthenium trichloride; 0.5 to 1.5 parts of iridium chloride (III) hydrate; 1-2 parts of copper sulfate pentahydrate; 2 to 4 parts of sodium hypophosphite; 1 to 2 parts of urea; 1 to 2 parts of glucose; 1-2 parts of sodium sulfide nonahydrate; 0.5 to 1 part of crystalline aluminum chloride; 50 to 100 parts of deionized water; and 0.1 to 0.5 part of hexadecyl trimethyl ammonium bromide. By introducing the plasma auxiliary treatment technology, the electronic structure of the catalyst is optimized, the conductivity and stability of the catalyst are improved, and the efficiency and durability of hydrogen production through water electrolysis are enhanced.

The invention relates to the technical field of high polymer materials, and discloses a synthesis method of low-chlorine polyphenylene sulfide nitrile, which comprises the following steps: carrying out pressurized prepolymerization reaction on a sodium sulfide solution and p-dichlorobenzene to obtain a first prepolymerization reaction product; carrying out copolymerization prepolymerization reaction on the first prepolymerization reaction product and 2, 6-dichlorobenzonitrile to obtain a second prepolymerization reaction product; carrying out heating polymerization reaction on the second prepolymerization reaction product and benzyl chloride to obtain a heating polymerization reaction product; and raising the temperature of the polymerization reaction product, and carrying out phase separation to obtain the low-chlorine polyphenylene sulfide nitrile. Under the condition of no auxiliary agent, the polymerization process of inert gas pressurization and phase separation is adopted, benzyl chloride is applied to adjust the end group, low-chlorine high-molecular-weight polyphenylene sulfide nitrile can be obtained in a short time, the production efficiency of synthesizing polyphenylene sulfide nitrile can be improved, the purification process of byproduct sodium chloride is shortened, auxiliary agent recovery is omitted, and the production cost is reduced. The engineering construction investment is reduced, and the production cost for manufacturing the polyphenylene sulfide nitrile is greatly reduced.

The invention discloses a grading magnetic-flotation combined beneficiation method for sulfur-oxygen mixed copper ore. The grading magnetic-flotation combined beneficiation method comprises the steps of ore grinding and screening, magnetic separation, grading, copper sulfide flotation, copper oxide roughing and copper oxide enhanced scavenging. According to the method, strong magnetic separation is adopted in the mill grading system to recover part of coarse-grain copper oxide, excessive grinding of copper oxide minerals in the ore grinding process is reduced, early recovery can be achieved, the comprehensive recovery rate of copper oxide is increased, meanwhile, release of copper ions in the ore grinding process is reduced, and the adverse effect on follow-up copper sulfide flotation is relieved. The efficient copper oxide vulcanizing agent is composed of sodium sulfide and sodium pyrosulfite, the stability of a film in the vulcanizing process is enhanced, meanwhile, the inhibition effect on pyrite is enhanced, and the flotation separation efficiency of copper oxide is improved. In addition, by adopting an efficient reagent and precise regulation and control, copper oxide concentrate is directly obtained through open circuit of copper oxide roughing and enhanced scavenging concentrate, and the copper metal falling loss caused by closed cycle is reduced.

The invention discloses a polyphenylene sulfide oligomer separation method, which comprises: cooling a polyphenylene sulfide product synthesized by a sodium sulfide polymerization reaction, carrying out centrifugation, and carrying out solid-liquid separation to obtain polyphenylene sulfide and a mother solution; the preparation method comprises the following steps: putting polyphenylene sulfide into an aqueous solution of diethanol amine and 1, 3-dimethyl-2-imidazolinone for washing, and collecting a washing solution; mixing the washing solution and the mother solution, carrying out candle type filtration to obtain a filter cake, washing the filter cake with deionized water, and drying to obtain a polyphenylene sulfide oligomer; according to the method, the polyphenylene sulfide is washed in the aqueous solution of the diethanol amine and the 1, 3-dimethyl-2-imidazolinone, oligomer in the polyphenylene sulfide can be better washed out, meanwhile, the polyphenylene sulfide oligomer in the mother solution and the washing solution can be separated from other substances through the addition of the diethanol amine and the 1, 3-dimethyl-2-imidazolinone, and therefore the polyphenylene sulfide can be better washed out. The yield and the purity of the polyphenylene sulfide oligomer are improved.

The invention relates to a method for recovering platinum in nickel-platinum waste. The method comprises the steps of hot nitric acid dissolution, filtration, pH adjustment, selective precipitation and drying. The characteristic that hot nitric acid can completely dissolve Ni and partially dissolve Pt is utilized to achieve preliminary separation of NiPt, sodium sulfide is used as a precipitator, selective precipitation of platinum is achieved through the Ksp difference of platinum sulfide and base metal sulfide within the pH range of 1-2, the recovery rate of platinum is greatly increased, and energy consumption of the platinum recovery process is reduced. Emission of a large amount of volatile acid is avoided while economic benefits are improved, and the method is more suitable for actual production.

The invention discloses a method for preparing high-purity zinc sulfide by using activated zinc oxide, which comprises the following specific steps: 1) adding activated zinc oxide into a dilute sulfuric acid solution, heating, stirring and filtering to prepare a zinc sulfate solution; (2) dropwise adding dilute sulphuric acid into the sodium sulfide solution, introducing N2 to pressurize, desulfurizing and dehydrating the generated mixed gas of hydrogen sulfide and N2, introducing the mixed gas into the bottom of the zinc sulfate solution to react while stirring, designing a container filled with zinc sulfate into three-stage series connection, after dropwise adding is finished, turning off N2, continuously stirring, after stirring is finished, standing to precipitate zinc, and then carrying out centrifugal suction filtration to obtain zinc sulfide; 3) adding deionized water to wash zinc sulfide to obtain a wet zinc sulfide product; 4, the wet zinc sulfide product is put into a vacuum drying furnace to be dried, then the dried zinc sulfide is crushed into powder through an N2 airflow crusher, and the industrial high-purity zinc sulphide is obtained.According to the method, the complicated process of zinc sulfate refining and sulfide purifying is omitted, and the generated zinc sulfide product is high in purity, few in impurity and extremely low in raw material loss.

The invention provides a method for removing nitrate in water by using a modified zero-valent iron aerogel electrocatalyst, which comprises the following steps: preparing a mixed solution of ferrous sulfate and sodium sulfide, preparing a sodium borohydride solution, mixing and magnetically stirring the mixed solution and the sodium borohydride solution to obtain black colloid, and finally obtaining vulcanized zero-valent iron aerogel, dispersing the obtained sulfurized zero-valent iron aerogel and a Nafion solution in absolute ethyl alcohol to prepare a catalyst mixed solution; potassium nitrate and potassium hydroxide are dissolved in a pure water solution to serve as electrolyte, a sulfurized zero-valent iron aerogel electrode is used as a cathode, a platinum sheet is used as an anode, a mercuric oxide electrode is used as a reference electrode, and an electrocatalytic reduction reaction is carried out by using a three-electrode system. The technology not only can improve the efficiency of water nitrate pollution treatment, but also conforms to the concept of green and low-carbon development, and has a wide environment application prospect.

The invention relates to the technical field of cement preparation, and particularly discloses dry-process clinker cement and a preparation process thereof. The dry-process clinker cement comprises the following raw materials in parts by weight: 180-200 parts of limestone; 30-50 parts of iron tailing powder; 20 to 30 parts of coal gangue; 10 to 20 parts of fly ash; 5-8 parts of calcium fluoride; 5-8 parts of nano silicon dioxide; 1-5 parts of nano calcium carbonate; 1-5 parts of sodium sulfide; 1-5 parts of a charcoal-ferrous sulfate loading material; 100 to 200 parts of water; 5-20 parts of a sintering aid; the biochar-ferrous sulfate loading material is obtained by loading ferrous sulfate on biochar particles. According to the dry-process clinker cement disclosed by the invention, the reduction activity and chromium removal efficiency of the ferrous sulfate can be effectively enhanced through the charcoal-ferrous sulfate loading material, so that hexavalent chromium in the cement can be efficiently removed by using a relatively small amount of ferrous sulfate, and the cement can keep relatively good compressive strength while the cost is reduced.

The invention relates to the technical field of heavy metal adsorption, in particular to a preparation method and application of a heavy metal adsorption material based on lead-zinc tailings, and the preparation method comprises the following steps: S1, grinding the lead-zinc tailings until the particle size is less than 75 microns, and drying; s2, putting the lead-zinc tailings treated in the step S1 into a microwave reactor, and carrying out microwave thermal modification treatment for 5-15 minutes at the power of 600-1000W; s3, the lead-zinc tailings subjected to microwave treatment are soaked in a sodium sulfide solution with the mass concentration being 0.5%-2%, and surface vulcanization treatment is conducted; and S4, heating the lead-zinc tailings subjected to sulfuration treatment to 800-950 DEG C at the speed of 3-10 DEG C / min under the protection of nitrogen, calcining for 1-3 hours, cooling, washing and drying to obtain the heavy metal adsorption material. The adsorption material with a good heavy metal treatment effect is synthesized through microwave thermal modification assisted by surface vulcanization treatment and high-temperature sintering of the lead-zinc tailings.

The invention provides a synthesis method and application of a sulfuration modified palladium-iron bimetallic material. The method comprises the steps that potassium borohydride and sodium sulfide nonahydrate are dissolved in a solvent, sodium hydroxide is added into a sulfuration solution, the pH of the sulfuration solution is adjusted to be alkaline, and an alkaline solution is obtained. The method comprises the following steps: dropwise adding an alkaline solution into a mixed aqueous solution of FeSO4. 7H2O and sodium tetrachloropalladate at a speed of 10mL / min in a nitrogen atmosphere; and separating the precipitate from the mixed aqueous solution in a magnetic separation manner, and washing the precipitate for three times by using oxygen-free water and absolute ethyl alcohol to obtain the palladium iron sulfide bimetallic particles. Through a one-step reduction method of vulcanization and palladium doping, vulcanization modification and bimetal modification are combined to act on zero-valent iron, the stability of the zero-valent iron is enhanced through vulcanization, meanwhile, the reactivity of the zero-valent iron is improved through addition of bimetal, especially the selectivity to pollutants such as chlorinated paraffin and the reactivity after surface passivation are improved, and the stability of the zero-valent iron is improved. And the reliability and efficiency of the zero-valent iron in organic pollution remediation are greatly improved.

The invention discloses an electrolyte interference resistant solid heavy metal cation electrode and a preparation and use method thereof, and belongs to the technical field of electrode preparation. The electrode sequentially comprises a heavy metal wire, a nano heavy metal coating, a heavy metal / selenide sensitive film or a heavy metal / sulfide sensitive film and a nano microporous polyvinyl chloride film from inside to outside. Firstly, a nanometer heavy metal coating is formed on the surface of a to-be-plated heavy metal wire through an electroplating method; placing in a sodium selenide solution or a sodium sulfide solution for chemical deposition reaction to generate a heavy metal / selenide sensitive film or a heavy metal / sulfide sensitive film to obtain a heavy metal ion selective electrode blank; vertically dipping in a film-forming agent, and standing vertically with the detection end facing upwards, so that a nano-microporous polyvinyl chloride film is generated on the surface; and finally, washing to remove the residual film-forming agent, and drying to obtain the electrolyte interference resistant solid heavy metal ion electrode. The electrode is firm in structure and small in size, is matched with a reference electrode for use, and is sensitive in response to metal ions in a solution to be detected.

The invention relates to the technical field of battery materials, in particular to a preparation method of a lithium sulfide material. The preparation method of the lithium sulfide material comprises the following steps: S1, mixing lithium carbonate and sodium sulfide, heating to a first heating temperature to melt lithium carbonate and react with sodium sulfide, separating out a solid phase, and collecting a first solid; s2, the first solid is heated to a second heating temperature, the second heating temperature is higher than the melting point of sodium carbonate and lower than the melting points of lithium sulfide and sodium sulfide, a solid phase is separated out, and a second solid is collected; s3, the second solid is heated to a third heating temperature, the third heating temperature is higher than the melting point of lithium sulfide and lower than the melting point of sodium sulfide, a liquid phase is separated out, and a liquid lithium sulfide material is prepared; and S4, carrying out curing treatment on the liquid lithium sulfide material to prepare a solid lithium sulfide material. The preparation method improves the reaction conversion rate, simplifies the process flow, reduces the cost and improves the product purity.

The invention relates to the technical field of fly ash treatment, in particular to a treatment method of fly ash washing high-salinity wastewater, which comprises the following steps: A) stirring and mixing the fly ash washing high-salinity wastewater and a flocculating agent for flocculation; adjusting the pH (Potential of Hydrogen) value of the supernate to 8.5 to 9.5; b) stirring and mixing the treated wastewater with sodium sulfide and a flocculating agent for removing heavy substances, and then carrying out solid-liquid separation; c) stirring and mixing the wastewater subjected to solid-liquid separation with sodium sulfate for primary calcium removal and solid-liquid separation; d) stirring and mixing the wastewater treated in the step C), sodium carbonate and a flocculating agent for secondary calcium removal and solid-liquid separation; e) filtering the wastewater treated in the step D), mixing with an oxidizing agent, and performing ultrafiltration; and F) adjusting the pH value of the ultra-filtered wastewater to 6.5-7.5, filtering with activated carbon, and carrying out nanofiltration to obtain a purified water body. The treatment method provided by the invention can realize efficient treatment of the fly ash washing high-salinity wastewater, and is simple to operate, relatively low in energy consumption and relatively low in cost.

The invention relates to the technical field of substance detection, in particular to a paper-based chip for detecting cadmium ions by LIBS (Laser-induced Breakdown Spectroscopy) as well as a preparation method and application of the paper-based chip. The preparation method comprises the following steps: 1) mixing a zinc salt solution and a sodium sulfide solution, and reacting to obtain a ZnS nano-particle solution; (2) mixing the ZnS nano-particle solution, polyvinylpyrrolidone and an acid solution to obtain a ZnSNPs (zinc single nucleotide polymorphisms) modified solution; and 3) mixing the ZnSNPs modified solution with a filter paper sheet, oscillating, adding an alcoholic solution, cleaning and drying. The paper-based chip provided by the invention can efficiently enrich the heavy metal element cadmium in the water body so as to carry out LIBS detection, and high-sensitivity, rapid and efficient detection of the heavy metal Cd in the water body can be well realized by combining the LIBS technology with the provided paper-based chip.

The invention discloses a low-viscosity liquid sulfur working medium and a preparation method and application thereof.The low-viscosity liquid sulfur working medium comprises liquid sulfur and at least one doping substance, the doping substance contains sodium sulfide or copper chloride, and the doping substance is preferably sodium sulfide nonahydrate or copper chloride dehydrate; wherein the weight percentage of the sodium sulfide or the copper chloride to the liquid sulfur is preferably 2-10%. The liquid sulfur is doped with metal salts such as sodium sulfide or copper chloride, so that free hydrogen atoms or chlorine atoms occupy the tail end position of chain-shaped sulfur, and the chain segment of long-chain sulfur is broken, thereby reducing the viscosity of the liquid sulfur working medium. Compared with hydrogen sulfide, halogen, organic substances and other dopants with high volatility, the modified sulfur obtained by doping the metal salts has more stable viscosity change and better high-temperature resistance after multiple heat storage and release cycles, the dopant decomposition caused by high temperature is avoided, the doping process is simple, the cost is low, and the method is suitable for industrial production. The large-scale application of the liquid sulfur working medium is favorably realized.

The invention discloses a method for preparing raw material phosphoric acid for monopotassium phosphate by multi-stage synergistic purification of wet-process phosphoric acid, and relates to the technical field of wet-process phosphoric acid purification. The method specifically comprises the following steps: firstly, adding part of SiO2 into dilute phosphoric acid, and pumping the dilute phosphoric acid into a defluorination tower for stripping and defluorination; adding the rest SiO2, pumping into a flash chamber, and carrying out vacuum concentration and defluorination; pumping into a desulfurization reaction tank, adding phosphoric ore pulp according to a calcium-sulfur ratio, clarifying the slurry in a thickener after reaction, and filtering the upper overflow clear liquid to obtain desulfurized phosphoric acid; adding sodium sulfide, reacting at normal temperature, heating, continuously reacting, and carrying out solid-liquid separation to obtain dehydrophosphoric acid; and enabling the de-heavy phosphoric acid to sequentially pass through three activated carbon fiber filtering devices which are connected in series, so as to obtain the raw material phosphoric acid which can be directly used for producing the monopotassium phosphate after being purified. A gradient purification system is constructed through concentration defluorination, phosphoric ore pulp desulfurization, sodium sulfide heavy component removal and activated carbon fiber decoloration in a multi-stage process cooperation mode, and step-by-step efficient removal of fluorine, sulfur, heavy metal and pigment in wet-process phosphoric acid is achieved.

The present invention discloses a treatment agent for inhibiting microbial corrosion of carbon steel pipelines in circulating cooling water and a method for using the same, and belongs to the technical field of treatment agents for circulating cooling water. The treatment agent for inhibiting microbial corrosion of carbon steel pipelines in circulating cooling water comprises a first treatment agent and a second treatment agent, wherein the first treatment agent comprises the following components: sodium thiosulfate, a surfactant, dithiothiomethane, an oxidant, and a first precipitant, sodium sulfide; the second treatment agent comprises the following components: sodium thiosulfate, a surfactant, dithiothiomethane, an oxidant, and a second precipitant. The present invention can form an anti-microbial corrosion layer on the surface of a carbon steel pipeline, isolate the direct contact between the carbon steel pipeline and the circulating cooling water, protect the carbon steel pipeline, and inhibit the corrosion of the carbon steel pipeline by microorganisms in the circulating cooling water for a long time.