21 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 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 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.

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 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.

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 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.

The application discloses a preparation method of lignin sulfonate and application of the lignin sulfonate in high-temperature dyeing of polyester, and belongs to the technical field of dye dispersants. The preparation method is as follows: SBA-15 after alkali etching is immersed in a precursor solution, and is subjected to aging, drying and calcination treatment; the obtained metal-loaded SBA-15 is immersed in a 3-mercaptopropyltrimethoxysilane toluene solution, and tetraethyl orthosilicate is added to perform a reaction, so as to obtain a silanization modification catalyst; the silanization modification catalyst is oxidized through a peroxymonosulfuric acid aqueous solution, so as to obtain a Mn-Cu@SO3H / SiO2 catalyst; lignin is added into deionized water, polyformaldehyde and the Mn-Cu@SO3H / SiO2 catalyst are added to perform a reaction, and sodium sulfite is added to perform a reaction, so as to obtain the lignin sulfonate. The prepared lignin sulfonate has excellent high-temperature dispersion stability, low fiber staining and high dispersing force characteristics, and can be applied to high-temperature dyeing of polyester fabrics.

The present application relates to the technical field of rare and precious metal refining, and particularly relates to a method for preparing high-purity gold ingot from silver anode slime and high-purity gold ingot, comprising the following steps: crushing and grinding the silver anode slime, mixing the silver anode slime with a chlorine-free composite leaching agent, and filtering to obtain gold-containing leaching residue and impurity-containing leaching solution; washing and drying the gold-containing leaching residue to obtain gold-enriched residue; mixing the gold-enriched residue with a decontamination agent, and filtering to obtain pure gold residue and decontamination waste liquid; mixing the pure gold residue with a reducing liquid, adjusting the pH value to 1.0-2.0, and filtering to obtain sponge gold; washing the sponge gold to neutral, melting and casting ingot at 1100-1200 DEG C, naturally cooling after heat preservation for 20-30 min, and obtaining high-purity gold ingot. The present application realizes efficient separation of most impurities such as silver and copper by using a nitric acid-sulfuric acid composite leaching agent, and then removes residual trace impurities such as palladium and silver by using a hydrochloric acid-sulfuric acid decontamination agent, and finally, the purity of the high-purity gold ingot is greater than or equal to 99.99% by using an oxalic acid-hydrochloric acid reducing system to accurately control the reduction process.

The invention belongs to the technical field of wastewater treatment, and particularly discloses a molybdenum smelting flue gas acid-making wastewater classification treatment system and method, and the system comprises a purification wastewater treatment unit and a dry absorption wastewater treatment unit, the purified wastewater treatment unit comprises a collection module A, a neutralization and precipitation module, a heavy metal removal and decalcification module, a multi-medium-resin softening module and an ultrafiltration-reverse osmosis treatment module which are arranged in sequence, and the dry absorption wastewater treatment unit comprises a collection module B, a deep treatment module and an evaporation treatment module which are arranged in sequence. The purified wastewater treatment unit is used for treating the purified wastewater to obtain recycled water, concentrated water A and concentrated water B, the recycled water can be reused as industrial new water, the concentrated water A, the concentrated water B and the dry absorption wastewater are combined and treated by the dry absorption wastewater treatment unit, finally condensate water and industrial-grade sodium nitrite are obtained, the condensate water can be reused as industrial new water, and the industrial-grade sodium nitrite is recycled. The industrial sodium salt can be sold as a product, and zero discharge of the molybdenum smelting flue gas desulfurization dry absorption wastewater is realized.

The present application relates to a kind of high-sulfur lead-zinc ore split flow and speed flotation high-grade zinc concentrate method, the method uses sodium carbonate, humic acid salt, yeast powder, sodium sulfide, sodium pyrosulfite One or several combinations of sulfur depressant Ts4, zinc collector LY consisting of N, N-dialkyl dithiocarbamic acid ester, hydrocarbyl dithiophosphoric acid sulfide ester, octanol and non-polar oil portion, the method of split flow and speed flotation is carried out for zinc dressing, in the presence of high sulfur, can not add lime or strong base, it is conducive to environmental protection requirement, while can reduce reagent dosage, save reagent cost, reduce zinc concentrate amount, reduce equipment use and maintenance cost, while being able to obtain high-quality high recovery rate zinc concentrate, reach the final goal of efficient recovery of zinc mineral.

The invention relates to an inhibitor for zinc sulfide ore flotation and a flotation method, in particular to the technical field of mineral processing, and the inhibitor for zinc sulfide ore flotation comprises sodium pyrosulfite, tannin, carbonized sodium cyanurate and caustic alkali. According to the inhibitor provided by the invention, good selective inhibition performance is achieved when flotation is carried out on zinc sulfide ore through the synergistic effect of all the components, sodium pyrosulfite is decomposed to generate sulfite, the sulfite, tannin and carbonized sodium cyanurate form a composite adsorption layer, the surface of pyrite is firmly covered with the composite adsorption layer, meanwhile, the adsorption effect of a composite system on sphalerite is extremely weak, and the flotation effect is good. And the reaction of the sphalerite and the collecting agent is not affected, so that selective separation of the sphalerite and the collecting agent is achieved, and a good inhibition effect can be achieved with a small dosage in the flotation process.

A preparation method of a secondary copper sulfide-containing copper-lead-zinc ore partial mixed flotation regulator, first, hexamethyl tetramine and ferrous nitrate are added into an organic solvent ethylene glycol monoethyl ether, a nitrolysis reaction is fully carried out at a temperature of 0-20 DEG C, and a strong solubility solvent A is obtained; then, sodium pyrosulfite, zinc sulfate and a catalyst ferrous ammonium sulfate are added into the solvent A, heating is carried out until the solid is completely dissolved, then the heating is stopped, a solution B is obtained; sodium hydroxide is added into the solution B, stirring is uniformly carried out, then rapid cooling is carried out to-20-0 DEG C, a solid is separated out in the cooling process, filtration is carried out, the solid is collected, the solid is repeatedly washed with deionized water, and the secondary copper sulfide-containing copper-lead-zinc ore partial mixed flotation regulator is obtained. The prepared regulator can effectively reduce the mutual inclusion of copper, lead and zinc in the partial mixed flotation, improve the separation efficiency of copper and lead from zinc and copper and lead, and thus improve the resource utilization efficiency.

The invention discloses an efficient and green synthesis method for preparing 1, 3-propene sultone, and relates to the field of preparation of 1, 3-propene sultone. The preparation method comprises the following steps: carrying out addition reaction on allyl alcohol and sodium hydrogen sulfite or sodium metasulfite in water; acidizing and separating to obtain gamma-hydroxypropane sulfonic acid; in a cyclization dehydration stage, gamma-hydroxypropane sulfonic acid, an inactive dehydrating agent and a catalyst modified by special resin are mixed, and heating and normal-pressure reaction are performed; and finally recrystallizing and purifying. The method is low in raw material cost, the catalyst can be repeatedly used, the yield and the product purity are remarkably improved, operation is mild, waste is few, and the method is suitable for large-scale industrial production.

The invention discloses a kit for carrying out sulfite conversion on nucleic acid. The invention provides a reagent for carrying out sulfite conversion on nucleic acid. The reagent comprises sulfite conversion liquid; the sulfite conversion liquid contains sodium metabisulfite with the final concentration of 0.4-0.8 g / L and ammonium hydrogen sulfite with the mass percent of 10%-20%; the pH value of the sulfite conversion liquid is 5-6. Sodium metabisulfite and ammonium bisulfite are selected as sulfite, the cost is low, the research and development cost of an enterprise can be effectively reduced, large-scale industrial production is promoted, and the method is more suitable for the development requirement of the market. Besides, the temperature of the conversion procedure step in the kit using method is adjusted, so that the whole conversion reaction time is only 70 minutes, the preparation efficiency is high, the preparation time is shorter, and the product is long in preservation time, low in price and stable in supply.

The invention relates to a recovery method of hexazinone production wastewater, and belongs to the technical field of waste liquid recovery. According to the recovery method, high-efficiency separation of methanol and high-boiling-point impurities is realized through pressurized rectification and precise temperature control of tower top and tower kettle temperatures in cooperation with high-efficiency stainless steel wire mesh filler; by constructing a ferric oxide-activated carbon catalyst, sodium sulfite and circulating amine salt solution ternary synergistic toxicity breaking system, the efficiency bottleneck of a traditional single reducing agent is broken through, and synergistic interaction is achieved; efficient capture and high-value conversion of ammonia nitrogen are realized through precise stoichiometric control and an electrochemical innovation scheme; and a carbon dioxide saturated aqueous solution with the pH value of 5.3-5.7 is innovatively adopted to replace an organic solvent for adsorption column desorption, so that the desorption efficiency is greatly improved, and the VOCs emission and hazardous waste disposal risks caused by the use of methanol are effectively eliminated. According to the recycling method, the recycling rate and the purity are guaranteed, and meanwhile the recycling rate of substances such as organic amines is increased.

The method comprises the following steps: mixing concentrated hydrochloric acid and concentrated sulfuric acid according to a certain ratio to form a mixed acid system, adjusting the acidity with distilled water, then adding the matte slag and MnO2 according to a certain mass ratio, carrying out normal-pressure oxidation leaching to obtain a leachate, adding anhydrous sodium sulfite into the leachate according to a ratio, and carrying out a reduction reaction to obtain tellurium. And washing and drying a precipitation product obtained by the reaction to obtain the tellurium elementary substance with the purity of more than or equal to 98%. According to the method, hydrochloric acid and MnO2 react to release a strong oxidant Cl2, the strong oxidizing property of Cl2 directly destroys crystal lattices of telluride, tellurium exists in the leachate in the form of Te4 +, meanwhile, Cl2 has a weak oxidation effect on copper, leaching of copper can be effectively reduced, efficient separation of tellurium and copper is guaranteed, and the problems of precious metal loss and low separation efficiency in a traditional process are solved.