21 results about "Sodium bisulfate" patented technology

This invention relates to the field of lithium-ion battery technology, specifically to a method for recycling aluminum metal from high-aluminum cathode material black powder in waste lithium batteries. The method includes: dry mixing the black powder with anhydrous sodium sulfate, acidifying with concentrated sulfuric acid, spraying with an aqueous sodium sulfate solution and adding sodium bisulfate monohydrate to obtain a pretreated material; after staged acidification and roasting, lithium is extracted by water leaching; the water leaching residue is leached under low-acid conditions; the low-acid leachate is precipitated with sodium fluoride to obtain cryolite; the post-aluminum precipitate is then treated with iron removal and pH adjustment to prepare a nickel-cobalt-manganese extraction pre-liquid. This invention, by controlling the distribution of sulfate ions on the aluminum surface and staged roasting, reduces the gas production and aluminum load during low-acid leaching, combined with the directional precipitation of aluminum using low-pH cryolite. This achieves efficient lithium recovery while significantly reducing the loss of nickel, cobalt, and manganese with the aluminum slag. Aluminum is recovered in the form of cryolite for high-value recovery, greatly improving resource utilization and process safety.

This application provides a method for recycling lithium-aluminum-silicon glass waste, relating to the field of solid waste resource utilization. The method includes: mixing lithium-aluminum-silicon glass waste powder with additives, calcining to obtain a calcined material, wherein the additives include sodium and calcium salts, the sodium salt including at least one of sodium sulfate and sodium bisulfate, and the calcium salt including at least one of calcium sulfate and calcium bisulfate. The molar amount of calcium in the additives is more than 0.4 times the molar amount of aluminum in the lithium-aluminum-silicon glass waste, and the molar amount of sodium is more than 0.9 times the molar amount of aluminum in the lithium-aluminum-silicon glass waste. The calcined material is then mixed with a leaching agent for leaching. The lithium-containing leaching solution of this application contains few types and amounts of impurities, and high-purity lithium compounds can be prepared after simple impurity removal treatment. This enables efficient recovery and reuse of valuable elements in low-value lithium-aluminum-silicon glass waste, solving the environmental pollution problem caused by glass waste stockpiling and reducing space occupation.

The application discloses a high-stability and low-irritation oxytetracycline long-acting injection and a preparation method thereof. 2+ EDTA-2Na and sodium formaldehyde bisulfite are coordinated to stabilize, and forsythia extract reduces irritation; the pH of the finished product is 8.2-8.8. The method comprises acid pre-coordination, pre-filtration, ultrafiltration, reduction and deoxygenation (dissolved oxygen is less than or equal to 2 ppm) and 0.22 mu m terminal sterile filtration. The application realizes long-term clarification and content stability under high loading, and inhibits metal catalytic oxidation and alkali-sensitive degradation.

The application discloses a kind of polymeric quaternary phosphonium salt fungicides and its preparation method and application the method includes steps: S1, 3, 5-dihydroxyacetophenone, water, organic acid, organic phosphine reaction obtains intermediate product A;S2, brown intermediate product A is reacted in alcohol and halogenated hydrocarbon, and brown viscous product is obtained;S3, brown viscous product is dissolved in ester solvent, filtration is carried out, and the polymeric quaternary phosphonium salt fungicide monomer separated in filtrate is taken;S4, polymeric quaternary phosphonium salt fungicide monomer is added in water, and aqueous solution of potassium persulfate, aqueous solution of sodium bisulfite are sequentially added dropwise, and viscous liquid is obtained;S5, viscous liquid is filtered to obtain light yellow solid, and the light yellow solid is placed in oven and dried overnight, and polymeric quaternary phosphonium salt fungicide is obtained.The polymeric quaternary phosphonium salt fungicide of the application has killing effect on SRB, TGB and IB in oil-containing sewage, and has the advantages of low use concentration and high sterilization efficiency.

This invention provides a method for lithium extraction from lepidolite, comprising the following steps: S1, mixing lepidolite ore with ferrous sulfate heptahydrate and sodium bisulfate, followed by mechanical activation to obtain a pretreated mixture; the mass ratio of lepidolite ore, ferrous sulfate heptahydrate, and sodium bisulfate is 1:0.07-0.5:0.07-0.5; S2, calcining the pretreated mixture to obtain clinker; the calcination temperature is 700-900℃; S3, sequentially subjecting the clinker to water leaching and solid-liquid separation to obtain a lithium leachate. This invention can increase the lithium extraction efficiency from lepidolite to over 98% at a relatively low calcination temperature.

This invention discloses a refining process and equipment for high-concentration sulfur dioxide byproducts of chemical production tail gas, relating to the field of chemical tail gas treatment and resource recovery technology. The process includes pretreatment, adsorption and regeneration, extractive distillation, double-effect distillation, and finished product collection. In this invention, micro-oxygen pre-removal utilizes the reaction of sodium bisulfite with oxygen to remove trace amounts of oxygen from the tail gas. Simultaneously, the crystals precipitated from the reaction capture residual micron-sized acid mist, blocking the sulfite oxidation side reaction at its source and preventing equipment scaling and clogging. Gradient reverse adsorption changes the gas flow direction, matching different concentrations of impurities to corresponding adsorbents, achieving synchronous saturation of each adsorption layer and improving adsorbent utilization. Pressure swing extractive distillation sets different pressure ranges within a single tower to increase the relative volatility of carbon disulfide and sulfur dioxide, enhancing the separation of difficult-to-separate impurities. Finally, a four-stage separation system is constructed to remove impurities of different properties at each stage for progressive depth removal.

An embodiment provides a method for making a non-hazardous iron product for treating wastewater, including: adding sodium bisulfite to a solution comprising iron, creating an aqueous solution; adding an amount of sodium hydroxide to the aqueous solution to increase the pH of the aqueous solution to between 2-2.5; determining an amount of sodium bicarbonate and adding the identified amount of sodium bicarbonate to the aqueous solution, wherein the sodium bicarbonate adjusts the pH of the aqueous solution to a desired pH; and providing a buffer to the aqueous solution to generate a slurry. Other embodiments are described and claimed.

The application relates to the field of adhesive stickers, and discloses a 3D-printable intelligent self-adaptive adhesive sticker as well as a preparation method and application thereof, which comprises the following steps: dissolving PVA in a DMSO mixed solvent, adding 3,5-dihydroxybenzoic acid, performing esterification reaction under the action of a catalyst sodium bisulfate for 24 hours, performing dialysis purification and freeze-drying drying after the reaction is completed to obtain a PVA-DHBA graft copolymer; dissolving the PVA-DHBA graft copolymer and PVA-SbQ in deionized water or a water / alcohol mixed solvent to form ink which is uniform and has certain viscoelasticity; using an extrusion type or photocuring 3D printer to print the ink into a preset structure; immediately or in the molding process, using a UV light source to irradiate to trigger the crosslinking of the PVA-SbQ, realize the rapid stability of the structure, and obtain the printed structure; the application solves the problems of low biocompatibility, inability to realize wet-state self-adaptability, low safety of photocuring characteristics and low freedom degree of structure manufacturing capacity in the prior art.

The application discloses a microwave-assisted preparation method of a lignin sulfonate dye dispersant, and belongs to the technical field of dye dispersants. The preparation steps are as follows: purified lignin is prepared by taking papermaking black liquor as raw material; the purified lignin is dispersed in water, the pH value is adjusted to 10-12, and then the purified lignin is transferred to a microwave reaction kettle; formaldehyde and sodium sulfite are added, and a microwave-assisted heating mode is adopted to perform reaction, so that sulfonated lignin is prepared; the sulfonated lignin is added into water, the pH value is adjusted to 5, and under the protection of nitrogen, acrylic acid is added, sodium bisulfite solution is added dropwise, and ammonium persulfate solution is added dropwise; under the protection of nitrogen, the reaction is performed under light shielding and heating, so that an LS-AA grafting product is obtained; the LS-AA grafting product and polyethylene glycol diglycidyl ether are used as raw materials, a microwave heating mode is adopted to perform crosslinking reaction, and the lignin sulfonate dye dispersant is prepared. The application can improve the heat-resistant stability and dispersing force of the dispersant product, reduces the staining property, and achieves the resource recycling and product upgrading targets.

This invention belongs to the field of dyeing and printing auxiliaries technology, specifically relating to a sulfonic acid-based polyamide-polyether copolymer hydrophilic finishing agent and its preparation method. The invention provides a method for preparing a sulfonic acid-based polyamide-polyether copolymer hydrophilic finishing agent, using maleic anhydride, polyetheramine, adipic acid, and hexamethylenediamine as raw materials. Through an amidation polycondensation reaction, a polyether-modified polyamide condensate is obtained. Sodium bisulfite solution is added to the polyether-modified polyamide condensate, and a sulfonation reaction is carried out at 120-140°C for 3-4 hours. After the reaction, water is removed to obtain the sulfonic acid-based polyamide-polyether copolymer hydrophilic finishing agent. It can improve the hydrophilicity of nylon fiber fabrics.

The application discloses a method for promoting the Fenton-like oxidation effect of ferrous silicate under weak acid conditions, which comprises the following steps: adjusting the pH of organic wastewater to 4.5-5.5, adding ferrous silicate catalytic material and a promoter (sodium bisulfite and / or disodium malonate), and then slowly adding hydrogen peroxide for oxidation reaction. The method uses ferrous silicate catalytic material and sodium bisulfite or disodium malonate as the promoter, can catalyze the rapid and complete oxidation and degradation of hydrogen peroxide to organic wastewater under weak acid conditions, and solves the technical problems of the existing Fenton-like oxidation, such as the limitation to strong acid environment, low reaction rate under weak acid conditions, unstable effect of the promoter and low activity of the catalytic material, and is especially suitable for the treatment of dye wastewater, beneficiation wastewater and other water bodies containing refractory organic matters.

The application provides a Cu etching liquid compatible with multiple thickness film layers and a use method thereof, and relates to the technical field of metal film layer etching. The Cu etching liquid is composed of hydrogen peroxide, a weak organic acid, an alcohol amine corrosion inhibitor, polyethylene glycol, phosphoric acid, sodium bisulfate, polyaspartic acid sodium, and tri-potassium glycyrrhizinate, and the ratio of the sum of the mass percentages of the phosphoric acid and the sodium sulfate to the sum of the mass percentages of the polyaspartic acid sodium and the tri-potassium glycyrrhizinate is less than or equal to 1.5. The application overcomes the defects of the prior art, and the obtained Cu etching liquid can effectively etch Cu / MTD substrates with different thicknesses, and ensures the stability of etching under different copper concentrations.

This application relates to a low molecular weight, high viscosity polyacrylamide and its preparation method, belonging to the field of polymer material synthesis. The raw materials for preparation include the following components in parts by weight: 70-80 parts acrylamide, 8-12 parts 2-acrylamido-2-methylpropanesulfonic acid, 3-5 parts hydrophobic associating monomer, 3-6 parts reversible crosslinking monomer, 1-2 parts crosslinking agent, 0.3-0.5 parts surfactant, and 0.07-0.1 parts redox initiation system; the redox initiation system includes persulfate, sodium bisulfite, and N,N-dimethylethanolamine. The preparation method includes the following steps: adding the above monomers to water, stirring to prepare a mixed aqueous solution, adjusting the pH of the mixed aqueous solution to neutral, removing oxygen, adding the redox initiation system to react, and obtaining a polymer colloid; granulating, washing, drying, and pulverizing the polymer colloid to obtain the low molecular weight, high viscosity polyacrylamide. The polyacrylamide prepared in this application has high viscosity, good salt resistance, and shear recovery properties.

The present application belongs to the technical field of profile control agent preparation, and particularly relates to a profile control agent for shale oil reservoirs and a preparation method thereof. The profile control agent for shale oil reservoirs is prepared by using acrylamide and 3-((2-(methacryloyloxy)ethyl)dimethylamino)propionate inner salt as comonomers, using modified nano-Fe3O4 dispersion liquid and modified sodium-based montmorillonite dispersion liquid as modifiers, using four-arm polyethylene glycol acrylate as a crosslinking agent, and using ammonium persulfate-sodium bisulfite as an initiator system to initiate copolymerization and crosslinking reaction between raw materials, so as to obtain an organic-inorganic composite hydrogel profile control agent. The profile control agent has good plugging rate and shear resistance.

This invention discloses a high-impurity copper electrolytic anode mud treatment technology, belonging to the field of non-ferrous metal hydrometallurgical technology. Addressing the problem of high copper, nickel, selenium, and tellurium content and difficulty in precious metal recovery in anode mud, this invention provides a magnetic field-assisted treatment method: after crushing and ball milling the anode mud into a slurry, oxygen and hydrogen peroxide are introduced under a vertical magnetic field for oxidative acid leaching, efficiently recovering nickel, selenium, and tellurium; the leached residue is then reduced and enriched with sodium bisulfite and iron powder under a parallel magnetic field, and finally dissolved stepwise with aqua regia and nitric acid to obtain gold and silver powder. This invention achieves copper and nickel leaching rates ≥96.8%, selenium and tellurium leaching rates ≥70%, and enriched slag with a gold grade ≥5000 g / t and a silver grade ≥20%, offering advantages such as a short process, low energy consumption, and high recovery rate.

The application relates to the technical field of organic synthesis, and provides a preparation method of 4-[(2,4-diaminophenyl)azo]benzenesulfonic acid. The p-aminobenzenesulfonic acid, hydrochloric acid, sodium nitrite and a solvent are mixed, a diazotization reaction is carried out under strong acid conditions to generate a diazonium salt solution; the m-phenylenediamine, formaldehyde, sodium bisulfite and a solvent are mixed to generate 1,3-benzene di(iminomethyl sulfonic acid sodium) coupling solution; then the coupling solution is slowly added into the diazonium salt solution, and stirring is carried out at room temperature overnight; and after alkaline hydrolysis and acidification, the target product is obtained. The diazo coupling reaction is adopted to successfully synthesize a 4-[(2,4-diaminophenyl)azo]benzenesulfonic acid compound, the reagent used in the method is cheap and easy to obtain, the operation is simple, the yield is high, and the method is suitable for industrial production.

The application discloses a salt additive melt blending pretreatment method of PET products. After the PET products are crushed, the salt additive is mixed, melt blending is carried out at 268-275 DEG C for 4-5 minutes, direct cooling is carried out without quenching, crushing and 80 mesh screening are carried out, and a pretreatment product is obtained. The salt additive is selected from one or more of sodium nitrate, sodium nitrite, potassium nitrate, potassium nitrite, calcium nitrate, calcium nitrite, sodium bisulfate, potassium bisulfate, sodium phosphate and potassium phosphate, and the addition amount is 0.5%-1.0% of the mass of the crushed PET material. The method can control the crystallinity increase, improve the powder yield, and the obtained product can be used for subsequent enzymolysis.

This invention provides a method and reaction purification equipment for recovering and preparing lithium carbonate from waste lithium batteries, relating to the field of battery material preparation. The method for recovering and preparing lithium carbonate from waste lithium batteries includes the following steps: S1, disassembling, crushing, and sieving waste ternary lithium-ion batteries to obtain a mixture of electrode active material powders; S2, mixing the electrode active material powders with water to form a slurry, adding sodium bisulfate and sulfuric acid for a leaching reaction, filtering and separating after leaching to obtain a lithium-containing leachate. The method for recovering and preparing lithium carbonate from waste lithium batteries provided by this invention efficiently recovers lithium from waste ternary lithium batteries and prepares lithium carbonate battery material for reuse, reducing environmental pollution; simultaneously, the recovery and utilization of the byproduct anhydrous sodium sulfate further reduces production costs and improves economic efficiency. Furthermore, the method has clear steps, is simple to operate, and is easy to implement for industrial production.

The present application belongs to the field of steel material metallographic detection, and particularly relates to a display method of phosphorus element distribution of cord steel. The present application provides a phosphorus element distribution etchant solution which is composed of sodium bisulfite, calcium bisulfite and distilled water, wherein the concentration of sodium bisulfite is 1.2-1.4 g / mL, and the concentration of calcium bisulfite is 0.03-0.06 g / mL. The display method of phosphorus element distribution of cord steel comprises the following steps: preparing a cord steel metallographic sample, immersing the polished surface of the metallographic sample into the etchant solution for etching, observing the etched surface of the sample under an optical microscope, and observing the bright yellow linear strip as the phosphorus segregation area. The stability research shows that the etchant solution of the present application has high stability and does not need to be prepared and used immediately; the energy spectrum component analysis result shows that the etchant of the present application can clearly and reliably display the distribution of phosphorus element in the cord steel, and provides efficient, convenient and reliable detection technical support for the research of phosphorus element distribution of cord steel wire rod.