47 results about "Sodium sulfite" patented technology

The invention relates to an indole hair dye based on air oxidation. The hair dye provided by the invention is characterized in that a chemical strong oxidant is not added, and oxygen in air can be catalyzed by using an air oxidation catalyst and a metal ion catalyst to naturally finish the oxidative polymerization process of indole substances (natural bionic melanin precursor substances). The used reducing agent is a combination of cysteine and a derivative thereof and sodium sulfite and a derivative thereof, the oxidative polymerization speed of indole substances can be controlled, and finally generated melanin macromolecules are embedded in hair cortex, so that white hair is obviously blackened. The natural oxidation process does not need hydrogen peroxide, destructive strong base or organic base, so that the use of harmful chemical reagents is reduced, the formula is simplified, the hair dyeing process is milder, potential hazards to hair and scalp are reduced, and the natural oxidation hair dye is safe, environmentally friendly and sustainable.

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 deflocculating agent for concrete washed sand and a preparation method of the deflocculating agent. The deflocculating agent is prepared from 0.5 to 1 part of air entraining agent, 0.1 to 0.2 part of sodium lauryl sulfoacetate, 15 to 30 parts of sodium pyrosulfite, 20 to 32 parts of sodium thiosulfate, 0.5 to 1 part of triethanolamine, 35 to 49 parts of diquat, 2 to 5 parts of maltodextrin, 0.4 to 1 part of cellulose and 0.5 to 1 part of glyceryl monostearate. The anti-flocculating agent provided by the invention can play a role in suspension stabilization, prevents undesirable phenomena of system instability and fluidity reduction caused by particle aggregation, can effectively solve the undesirable problems of high concrete viscosity, insufficient slump retaining performance, easy segregation and bleeding and the like caused by a flocculating agent, effectively reduces the concrete viscosity, and improves the concrete quality. And the construction performance and the quality of hardened concrete are ensured.

The invention discloses a titanium dioxide calcination tail gas dust content ultralow emission method, relates to the technical field of titanium dioxide production tail gas treatment, and solves the technical problem of high tail gas dust content caused by the fact that actual tail gas treatment cannot meet the emission standard in the existing titanium dioxide calcination process. The method comprises the following steps: S1, carrying out primary spraying treatment on tail gas obtained after titanium dioxide is calcined so as to preliminarily remove dust and sulfur dioxide pollutants in the tail gas; s2, the tail gas treated in the step S1 is subjected to secondary water spraying treatment so as to absorb sodium sulfite generated in the step S1; and S3, the tail gas treated in the S2 is subjected to demisting treatment, so that acid mist in the tail gas is removed, and the tail gas reaches the emission standard. The device has the advantages that pollutants generated in the tail gas calcination process can be fully absorbed, and the tail gas dust content is reduced.

The present application relates to the technical field of mineral processing and metallurgy, and particularly relates to a processing technology for full combustion of sulfur ore in a fluidized bed furnace, which comprises the following steps: after the pyrite is crushed, the pyrite is screened and then compounded, and then the pyrite is floated with a high-efficiency inhibitor to obtain pretreated pyrite powder; the pretreated pyrite powder is then added into the fluidized bed furnace, is leveled and then is fully combusted to obtain furnace gas and furnace slag; the high-efficiency inhibitor is obtained by mixing sodium hyposulfite, sodium mercaptoacetate, sodium humate and a buffer; wherein the furnace temperature during the full combustion is 910-930 DEG C, the combustion duration is 4-5 h, and the oxygen concentration at the outlet of the fluidized bed furnace is 2.5%-3.0%. The specific particle size and high-quality combination roasting process of the pretreated pyrite powder make the present application have higher burning-out rate, higher iron grade of the furnace slag and longer service life of the circulating pump compared with the prior art, and the application prospect is also wider.

The application discloses a kind of sulphur oxygen mixed type copper ore grading magnetic-flotation combined beneficiation method, including grinding screening, magnetic separation, grading, copper sulphide flotation, copper oxide roughing, copper oxide strengthening scavenging.The application is by using strong magnetic separation recovery part coarse grain copper oxide in mill grading system, reduce the overgrinding of copper oxide mineral in the process of grinding, realize the ability to collect early collection, improve copper oxide comprehensive recovery rate, while reducing the release of copper ions in the process of grinding, reduce the adverse effect on subsequent copper sulphide flotation.By using sodium sulphide and sodium pyrosulphite to form efficient copper oxide sulphidizing agent, the stability of the film in the sulphidation process is strengthened, and the inhibition of pyrite is also strengthened, improving the separation efficiency of copper oxide flotation.In addition, by using efficient reagents and precise control, the copper oxide concentrate is directly obtained by opening the circuit of copper oxide roughing and strengthening scavenging concentrate, reducing the copper metal loss caused by closed loop circulation.

The utility model discloses a sulfur adding hopper for sodium pyrosulfite production, which comprises a storage hopper, a feeding port arranged at the upper end of the side surface of the storage hopper, a double-roller grinding mill arranged inside the outlet at the bottom of the storage hopper, a weighing box fixedly arranged at the outlet at the bottom of the storage hopper, and an electronic metering scale fixedly arranged on the inner bottom surface of the weighing box. A scale pan of the electronic metering scale is in a funnel shape, the center of the bottom of the scale pan is communicated with a discharging pipe, and the discharging pipe penetrates through the weighing box and extends out of one end below the weighing box to be communicated with and fixedly provided with an auger conveying mechanism. Sulfur is accurately metered, uniform adding and accurate control of the sulfur are guaranteed, the double-roller grinding machine is adopted for grinding the sulfur, uniform particle size of the sulfur is guaranteed, the hardening problem is solved, due to the design of the auger conveying mechanism, adding of the sulfur is more uniform and controllable, and the problem of insufficient combustion of the sulfur is avoided.

The invention discloses a multi-stage series absorption process for sulfur dioxide generated by incineration of sulfur-containing waste gas. SO2 in flue gas of an incinerator is subjected to multi-stage absorption, and then a solution containing sodium hydrogen sulfite can be obtained. The flue gas absorption device is formed by connecting a washing tank, a first-stage alkali liquor absorption tower, a second-stage alkali liquor absorption tower and a third-stage alkali liquor absorption tower in series, so that the aim of multi-stage absorption is fulfilled; and purified gas which is extracted from the top of the third-stage alkali liquor absorption tower and absorbed is discharged by a chimney. The device has the beneficial effects that the washing tank can effectively remove particle impurities such as carbon black and sulfur in the flue gas of the incinerator, the temperature of the flue gas from the incinerator can be reduced, and then the flue gas is cooled by the tower top condenser of the first-stage alkali liquor absorption tower, so that the absorption efficiency of the absorption tower is maintained at the optimal temperature to absorb sulfur dioxide in the flue gas of the incinerator; sodium hydroxide and sodium sulfite mixed alkali liquor is adopted for absorption, a sodium hydrogen sulfite solution is obtained, the content of sulfur dioxide (smaller than 100 ppm) in flue gas is effectively reduced, and the online monitoring requirement is met.

The invention relates to the technical field of mineral separation and metallurgy, in particular to a processing technology for sufficient combustion of sulfur ore in a fluidized bed roaster, which comprises the following steps: crushing pyrite, screening, compounding, and carrying out flotation by using an efficient inhibitor to obtain pretreated pyrite powder; the pretreated pyrite powder is added into a fluidized bed furnace, and sufficient combustion treatment is carried out after the pretreated pyrite powder is spread flatly, so that furnace gas and furnace slag are obtained; the efficient inhibitor is obtained by mixing sodium hydrosulfite, sodium thioglycollate, sodium humate and a buffering agent; wherein the furnace temperature during sufficient combustion treatment is 910-930 DEG C, the combustion time is 4-5 h, and the oxygen concentration of an outlet of the fluidized bed furnace is 2.5%-3.0%. The specific particle size and high quality of the pretreated pyrite powder are combined with a roasting process, so that compared with the prior art, the method has the advantages that the firing rate is higher, the iron grade of slag is higher, the service life of a circulating pump is longer, and the application prospect is wider.

The utility model relates to the technical field of sodium metabisulfite processing, in particular to a sodium metabisulfite sulfur feeding mechanism which comprises a barrel, a top cover is arranged at the top of the barrel, a sulfur feeding pipe is rotatably mounted in the center of the top cover, a plurality of sulfur discharging holes are formed in the lower portion of the outer side wall of the sulfur feeding pipe, and the sulfur discharging holes are communicated with the top cover. The top of the sulfur inlet pipe is connected with a gas conveying pipe through a rotary joint, the outer side wall of the sulfur inlet pipe is communicated with a plurality of stirring pipes, and a plurality of auxiliary holes are formed in the stirring pipes. According to the utility model, the sulfur inlet pipe is rotatably mounted on the top cover, when the sulfur inlet pipe needs to be cleaned, the rotary joint box gas conveying pipe is firstly disassembled, then the two lifting lugs are hooked by using a crane, and then a worker presses the fixing rod to enable the fixing rod to leave the through hole and enter the connecting hole, so that the fixation of the upper plate and the lower plate can be cancelled, and the separation of the top cover and the cylinder body is realized; the top cover can be lifted upwards by a crane, the sulfur inlet pipe is taken out from the cylinder, and a worker can conveniently clean the sulfur inlet pipe and the cylinder.

A method for preparing and using a high-carbon high-alloy steel isothermal quenching structure etchant, which belongs to the field of analysis and testing. It solves the problem that the existing Lepera etchant raw material picric acid is prohibited, and the conventional nitric acid alcohol etchant is difficult to efficiently and accurately etch and display the metallographic structure of high-carbon high-alloy steel after isothermal quenching. Preparation: A nitric acid alcohol solution with a volume fraction of 4% to 10% is mixed with a sodium metabisulfite solution with a mass fraction of 0.5% to 1%. Use: 1. Wire cutting sample preparation; 2. Grinding and polishing sample preparation; 3. Sample corrosion; 4. Metallographic structure observation. The present invention has low cost, convenient and safe operation, and no pollution; under the premise of ensuring safety, the etchant is used to achieve efficient and accurate observation, analysis and evaluation of the isothermal quenching structure of high-carbon high-alloy steel, so as to further evaluate the effectiveness of the isothermal quenching process; when used, it only takes 25 seconds to obtain an ideal tissue morphology. The present invention is suitable for metallographic etching of the isothermal quenching structure of high-carbon high-alloy steel.

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 hexavalent chromium polluted underground water green remediation system and application. The hexavalent chromium polluted underground water green remediation system comprises a remediation well body and a non-contact sustainable electron injection system arranged in the remediation well body. The repair well main body comprises a shaft and a through hole formed in the wall of the shaft; the non-contact sustainable electron injection system comprises a medicament chamber and a graphite cathode plate; the medicament chamber is a closed space enclosed by a proton exchange membrane and a sealing plug, and a graphite anode plate and a sodium dithionite solution are accommodated in the medicament chamber; the graphite cathode plate is electrically connected with the graphite anode plate; according to the non-contact sustainable electron injection hexavalent chromium polluted underground water green remediation method, a reducing agent does not need to be added into a water-containing layer, the secondary pollution risk caused by the reducing agent and a product thereof is avoided, and green and efficient hexavalent chromium underground water remediation is achieved.

The invention discloses a resource utilization method of sulfur dioxide in incineration flue gas, and relates to the technical field of incineration flue gas purification processes, and the method comprises the following steps: S1, introducing flue gas after hydrogen chloride is removed by a quench tower, a bag-type dust collector and a water absorption process into a multi-stage sulfur dioxide absorption tower, absorbing sulfur dioxide in the flue gas by taking a sodium hydroxide solution as an absorption medium to generate a mixed solution of sodium sulfite and sodium sulfate; s2, transferring the saturated absorption liquid into an oxidation device, and introducing air for oxidation reaction to obtain an oxidation reaction liquid; s3, cooling and crystallizing the oxidation reaction liquid, separating to obtain sodium sulfate decahydrate crystals, detecting and treating mother liquor, and recycling the mother liquor in an absorption tower. Resourceful treatment of sulfur dioxide in flue gas of waste incineration, coal-fired boilers, oil-fired boilers, thermal power plants, coking plants and other acid gases containing sulfur, chlorine and the like is realized; and resource utilization of sulfur dioxide in the flue gas is realized, no waste is generated, and the method is simple and efficient.

The invention discloses a kind of concrete water-washed sand deflocculant and preparation method thereof, the deflocculant includes 0.5 1 parts of air entraining agent, 0.1 0.2 parts of sodium lauryl sulfoacetate, 15 30 parts of sodium metabisulfite, 20 32 parts of sodium thiosulfate, 0.5 1 parts of triethanolamine, 35 49 parts of dimethicone, 2 5 parts of maltodextrin, 0.4 1 parts of cellulose, 0.5 1 parts of glyceryl monostearate.The deflocculant of the present invention can play the role of suspension stability, prevent the undesirable phenomenon that the system is unstable and fluidity is reduced due to particle aggregation, can effectively solve the concrete viscosity brought by flocculant, slump retention performance is insufficient, easy to separate the bad problems such as bleeding, and effectively reduce concrete viscosity, ensure construction performance and the quality of concrete after hardening.

The present invention belongs to the field of semiconductor materials, and specifically relates to a gallium antimonide reduction protective agent and an oxidation prevention method. The gallium antimonide reduction protective agent is prepared from a reducing agent and a solvent, the reducing agent is selected from one or more of sodium thiosulfate pentahydrate, sodium pyrosulfite, sodium bisulfite and sodium disulfite, and the solvent is water; the reducing agent accounts for 26-34% of the total weight of the gallium antimonide reduction protective agent, and the rest is water. The gallium antimonide reduction protective agent can be used as an immersion liquid to effectively remove the oxide layer on the surface of gallium antimonide in a short time, and add a protective layer on the surface of the gallium antimonide substrate, thereby achieving the protection of the gallium antimonide surface, solving the oxidation defects on the surface of gallium antimonide, and making gallium antimonide meet the production requirements without affecting subsequent processing.

The invention discloses a service-state austenitic stainless steel metallographic corrosive agent and a metallographic structure display method. The corrosive agent comprises the following raw materials: 1 g of copper sulfate, 1 g of sodium pyrosulfite, 1.5 g of sodium dodecyl benzene sulfonate, 1.5 g of hexamethylenetetramine, 8-12 ml of concentrated hydrochloric acid and 35-40 ml of deionized water. The corrosive agent disclosed by the invention has a good adaptation effect on austenite structures with different service degrees, so that the corrosion time and the eroded structure condition are easier to master, and the conditions of excessive corrosion and over-light corrosion are not easy to occur. Meanwhile, the grain boundary, the intragranular phase and the grain boundary precipitated phase, especially the sigma phase can be clearly displayed, and detection personnel can conveniently obtain key information such as the grain size level and the structure aging level. The corrosive disclosed by the invention is simple and cheap to prepare, the used proportioned raw materials are relatively high in safety degree, if the corrosive is carelessly adhered to the skin in an erosion process, the corrosive can be immediately cleaned by water or alcohol, the use risk is small, and the corrosive basically does not cause damage to the skin.

A method for recovering tin and indium from lead ore refining slag, comprising: adding limestone and crushed coal to lead ore refining slag, uniformly mixing same, then feeding same into a side-blown furnace for smelting under oxygen-enriched air conditions, cooling collected slag, and then adding a sulfuric acid solution and sodium dodecyl sulfate for grinding to obtain slag powder; adding an acid solution to the slag powder for acid leaching, filtering and separating same to obtain a filtrate A and a residue B, drying and pulverizing the residue B, and then smelting and recovering same to obtain crude tin; adding sodium sulfite to the filtrate A for stirring treatment, then adding calcium carbonate to adjust the pH to 4.5-5.5, performing stirring treatment, and then filtering to obtain a filtrate C and a residue D; adding an acid solution to the residue D for secondary acid leaching to obtain a leaching solution, adding zinc powder into the leaching solution for displacement and recovery to obtain crude indium, and at the same time, collecting the post-displacement solution and mixing same with the filtrate C to prepare zinc sulfate. The method can improve the recovery efficiency of tin and indium elements in refining slag, thereby facilitating recovery and utilization of lead ore refining slag.

The present invention relates to a reducing scale inhibitor and a preparation method thereof, comprising the following components in mass percentages: thiourea dioxide 1-1.5%, sodium bisulfite or sodium metabisulfite 10-15%, urea 3-5%, sodium hexametaphosphate 10-20%, hydrolyzed maleic anhydride 8-10%, oxalic acid 5-10%, and the balance being water. The reducing scale inhibitor of the present invention can significantly reduce the ORP and residual chlorine in wastewater with only a small dosage, and at the same time has a good scale inhibition effect on calcium ions, iron ions, manganese ions, etc. in the wastewater.

The invention discloses a copper sulfide ore flotation combined inhibitor and application thereof, and belongs to the technical field of mineral flotation inhibitors. The combined inhibitor is formed by mixing sodium pyrosulfite, 1, 2, 4-triazole sodium and sodium thiophosphate, and the mass ratio of the sodium pyrosulfite to the 1, 2, 4-triazole sodium to the sodium thiophosphate is 2: 2: 1. The combined inhibitor can be applied to flotation of copper sulphide ore, and the specific method comprises the steps that the combined inhibitor is added into ore pulp obtained after ore grinding so as to preferentially inhibit iron sulphide minerals, copper concentrate is obtained through one-time roughing, two-time concentration and two-time scavenging in cooperation with a collecting agent and a foaming agent, and efficient separation of copper ore and pyrite is achieved. The combined inhibitor can effectively replace traditional lime, overcomes the defects of foam stickiness, pipeline equipment scaling corrosion, tailing water pollution and the like caused by a lime high-alkali method, and achieves environment-friendly and efficient recovery of copper sulphide ore resources.

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 waterproof and antioxidant nuclear medicine dry printing film and a preparation method thereof, and relates to the technical field of printing films. The printing film adopts a three-layer structure of a bottom coating, a nuclear-sensitive imaging layer and a waterproof anti-oxidation layer. The preparation method comprises the following steps: pretreating a PET film, and coating and curing each coating. The bottom coating liquid contains hydroxyl acrylic resin, an isocyanate curing agent, nano silicon dioxide particles and ethyl acetate, and the core-sensitive imaging layer coating liquid takes gelatin and silver bromide as cores and is added with benzotriazole, sodium sulfite, polyethylene glycol diglycidyl ether and a fluorocarbon surfactant. The waterproof anti-oxidation coating liquid is prepared from polyvinylidene fluoride resin, an ethylene trifluorochloroethylene copolymer, nano titanium oxide particles and the like. The printing film has excellent surface performance, high image resolution and good long-term storage stability, and can meet the requirements of nuclear medicine clinical diagnosis and long-term archiving.

According to the copper and sulfur co-lattice doped nanoscale zero-valent iron and the preparation method and application thereof, based on the iron affinity and sulfur affinity of elements, the content of copper doped into nanoscale zero-valent iron lattices is successfully increased, the physicochemical property of the nanoscale zero-valent iron lattices is changed, and the stability and the trichloroethylene and florfenicol removal capacity are improved. When the material is synthesized, copper chloride is used as a copper source (thiophilic), ferric trichloride is used as an iron source, and a sulfur source (sodium dithionite) with both iron affinity and sulfur affinity is added as a'bridge '; the copper and sulfur co-lattice doped nano zero-valent iron material is synthesized by a simple and convenient one-step method through the modes of dissolving, mixing, stirring, drying and grinding. The crystal structure of the prepared copper and sulfur co-lattice doped nano zero-valent iron material is completely preserved, and copper and sulfur co-lattices are doped in nano zero-valent iron instead of covering the surface of iron to form a copper simple substance. The sulfur content and the electron transfer capability of the copper and sulfur co-lattice doped nano zero-valent iron material are improved, and the copper and sulfur co-lattice doped nano zero-valent iron material has super-hydrophobicity; the stability of the material is remarkably improved, that is, the service life of the material in water can reach more than 2 years, and 80% of zero-valent iron content and hydrophobicity can be maintained after the material is exposed in air for 30 days; and the capability of removing organic pollutants such as trichloroethylene and florfenicol in underground water can be enhanced. The synthesis method provided by the invention is simple and easy to operate, the performance of the material is remarkably improved, a new design idea can be provided for the co-lattice doped iron-based nano material, and the material is applied to remediation of polluted underground water.

The invention discloses a synthesis method of a novel sulfuryl heterocyclic compound. According to the method, sulfur dioxide released by sodium pyrosulfite is adopted as a double synthon, sulfonate free radicals and a single stable sulfur dioxide source are obtained through electrochemical oxidation of sulfur dioxide and methanol, and the sulfuryl heterocyclic compound with double-component sulfur dioxide inserted can be directly and orderly constructed without transition metal. And the method is mild in conditions, efficient and high in atom economy.

The invention relates to the technical field of nitroaniline wastewater treatment, and discloses a waste acid treatment process for co-producing sodium pyrosulfite, comprising the following steps: (1) waste acid stripping, (2) absorption reaction, (3) centrifugal separation, (4) drying and packaging, and (5) tail gas treatment, wherein the alkali solution for absorbing tail gas in step (5) is saturated and then mixed into the sodium sulfite solution for absorbing sulfur dioxide in step (2); the process uses the waste acid generated in the dye production process as a raw material for sodium pyrosulfite production, and after passing through a sodium pyrosulfite production section, the waste acid is neutralized and can be directly sent to a subsequent wastewater treatment section, and the process of the invention uses sodium sulfite to replace the liquid alkali in the traditional process to neutralize the waste acid.

The embodiment of the utility model provides a system for producing sodium pyrosulfite by using coke oven flue gas and coke oven gas, which comprises an absorption tower, a first desorption device, a washing tower, a second desorption device, an oxidation burner and a sulfur dioxide absorption device, the desorption device is used for desorbing saturated activated carbon to form first sulfur dioxide gas; the washing tower is used for absorbing hydrogen sulfide in coke oven flue gas by using turbid liquid prepared from iron oxide powder to form an intermediate liquid; the second desorption device is connected with the washing tower and is used for desorbing the intermediate liquid to form a sulfur-containing substance; the oxidation combustor is used for incinerating the dried sulfur-containing substances to form second sulfur dioxide gas; the sulfur dioxide absorption device is used for producing sodium pyrosulfite. On one hand, sulfur dioxide in the coke oven flue gas can be removed, pollution to the environment is reduced, on the other hand, the coke oven flue gas and coke oven gas can be used for producing sodium pyrosulfite, higher value and wider application are achieved, and the utilization rate of vulcanization resources can be increased.

This invention relates to the field of photocatalytic materials technology, and in particular to a method for molten salt-assisted synthesis of a sulfur-doped carbon-nitrogen supported iron single-atom photocatalyst and its application. The method includes: mixing and separating ferric chloride, hydrochloric acid, and melamine to obtain a solid precursor; subjecting the solid precursor and sodium sulfite to a first-stage heat treatment under a protective atmosphere to obtain a pyrolysis product; mixing the pyrolysis product with molten salt, grinding, and then subjecting it to a second-stage heat treatment under a protective atmosphere to obtain an intermediate; and acid washing and freeze-drying the intermediate to obtain the sulfur-doped carbon-nitrogen supported iron single-atom photocatalyst. This invention utilizes a two-step pyrolysis process and the molten salt template effect to achieve a nanorod-like structure for the photocatalyst, exhibiting both high specific surface area and stable anchorage of iron elements in an atomically dispersed form on the sulfur-doped carbon-nitrogen support. When applied to the photocatalytic water splitting reaction for hydrogen production, it demonstrates excellent catalytic activity, structural stability, and reaction reproducibility.

The invention discloses a method for preparing an NFS positive electrode material by using a sodium electrode layer oxygen precursor re-dissolving material, and relates to the technical field of sodium ion battery positive electrode material recovery, and the method comprises the following steps: adding bottom water into a dissolving kettle, starting stirring, adding the sodium electrode layer oxygen precursor re-dissolving material into the dissolving kettle for pulping, and then adding concentrated sulfuric acid for dissolving; adding water to dissolve sodium pyrosulfite, and pumping the dissolved sodium pyrosulfite into the dissolving kettle; adding reduced iron powder into the dissolving kettle to reduce Fe < 3 + >, filtering the material liquid after the reaction is finished, and transferring the filtered filtrate into an NFM precursor production line; replacing filter residues with nickel, filtering feed liquid, transferring filtrate into an NFS positive electrode material production line, and transferring the filter residues into a dissolving kettle for recycling; according to the method, the recovery of the sodium electrode layer oxygen precursor re-dissolution material is combined with the NFM precursor preparation and NFS spray drying process, so that the re-dissolution yield is systematically improved, and the nickel loss and hazardous waste treatment are reduced.

The invention discloses a combined inhibitor and application thereof. The combined inhibitor comprises the following raw material components in percentage by weight: 40%-70% of sodium pyrosulfite, 20%-40% of sodium thiosulfate, 1%-15% of tannin extract and 1%-10% of humate. The invention further discloses application of the combined inhibitor in lead zinc ore beneficiation. Compared with a conventional lime-free inhibitor, the combined inhibitor has the advantages of being high in adaptability, good in inhibition effect, environmentally friendly and the like, can replace lime, can be widely applied to lead-zinc ore dressing, not only can obtain higher lead and zinc concentrate grade and recovery rate, but also can remarkably improve the recovery rate of silver in lead concentrate, and has a good application prospect. And meanwhile, the content of zinc and sulfur in the lead concentrate can be remarkably reduced, so that the problems of pipeline scaling and low associated gold and silver recovery rate caused by mass use of lime can be avoided, the use value is high, and the application prospect is good.

A cleaning process for chromium-containing waste liquid storage containers, relating to the fields of metallurgical machinery and energy environmental protection, includes the following steps: S1, the system operation is controlled by a PLC. An industrial water valve is opened to inject a certain level of industrial water into the reaction tank. The pump from the reaction tank to the chromium-containing waste liquid storage container is turned on, injecting the solution into the chromium-containing waste liquid storage container through a solution spray pipe. Simultaneously, the pump from the chromium-containing waste liquid storage container to the reaction tank is turned on to pump the solution back into the reaction tank. Sulfuric acid and sodium metabisulfite solution are added to the reaction tank. This process is repeated for a certain period of time. Finally, after all the solution has been pumped into the reaction tank, an online hexavalent chromium detector is started to detect the hexavalent chromium content. In this invention, multiple chromium-containing waste liquid storage containers can be treated using a small amount of industrial water and chemical reagents. The hexavalent chromium content in the treated wastewater can be less than 0.05 mg / L, saving tens of times the amount of industrial water used and reducing the amount of chromium-containing wastewater treated by tens of times, thus saving treatment costs.