1654 results about "Mineral acid" patented technology

A forest fire retardant composition contains a retardant compound that includes a potassium salt. The potassium salt may include a potassium salt of an organic acid, a potassium salt of an inorganic acid, or mixtures thereof. The organic acid may include formic acid, acetic acid, propanoic acid, butanoic acid, lactic acid, oxalic acid, malic acid, gluconic acid, tartaric acid, uric acid, malic acid, or citric acid. The inorganic acid may include sulfuric acid, phosphoric acid, carbonic acid, or hydrochloric acid. The composition may be in the form of a dry concentrate, a liquid concentrate, or a final diluted product. The final diluted product is effective in suppressing, retarding, and controlling forest fires while exhibiting corrosion resistance and low toxicity.

The present invention provides a method for preparing a high purity nickel sulfate solution comprising the steps of: i. providing an aqueous feed solution comprising nickel, cobalt, calcium and magnesium; ii. extracting cobalt, calcium and partially magnesium from said aqueous feed solution using a first solvent comprising a first alkyl phosphorus based acidic extractant, thereby obtaining an aqueous raffinate comprising nickel and magnesium; iii. extracting magnesium from said aqueous raffinate comprising nickel and magnesium using a second solvent comprising a second alkyl phosphorus based acidic extractant, thereby obtaining a high purity aqueous nickel sulfate solution comprising nickel and magnesium; and iv. stripping the first entraining solvent comprising cobalt, calcium and magnesium with an aqueous solution comprising a mineral acid.

The preparation method comprises the following steps: treating sepiolite serving as a raw material with 3-aminopropyltriethoxysilane to prepare aminated sepiolite, ultrasonically blending the aminated sepiolite and a modified filler, then treating with phytic acid to prepare a flame-retardant filler, melting bisphenol A polycarbonate, blending with the flame-retardant filler, and carrying out extrusion molding to obtain the flame-retardant fireproof plastic. When the flame-retardant fireproof plastic is combusted, the flame-retardant filler is subjected to evaporation of hot water molecules to cause structural expansion and form an isolation layer, meanwhile, evaporation of the water molecules can take away heat, released ammonia gas can reduce the content of smoke so as to achieve the flame-retardant effect, and generated inorganic acid and phosphate ester are dehydrated and carbonized, so that the flame-retardant fireproof plastic has a good flame-retardant effect. The carbon layer with large interlayer spacing is formed through cooperation with the isolation layer, an organic silicon structure is contained, Si-C can be formed, then the density of the carbon layer is increased, aluminum oxide and magnesium oxide can be formed after internal aluminum ions and magnesium ions are combusted at high temperature, then the flame retardance of the carbon layer is improved, and the flame-retardant and fireproof effects of the plastic are improved.

The present invention belongs to the technical field of electrolytic copper foil. The present invention provides an electrolyte for ultra-thin electrolytic copper foil, in which the mass concentration of copper sulfate is 175-260 g / L, the mass concentration of inorganic acid is 80-100 g / L, the mass concentration of additive is 1-5 g / L, the mass concentration of complexing agent is 3-8 g / L, the mass concentration of conductive polymer is 0.5-3 g / L, and the mass concentration of hydrolyzed collagen is 0.1-0.5 g / L. The present invention also provides an ultra-thin electrolytic copper foil and a preparation method thereof. The present invention significantly reduces the thickness and roughness of the copper foil by controlling the components of the electrolyte and their concentrations and the electrodeposition process parameters, while improving the mechanical properties, antioxidant properties and electrochemical properties of the copper foil. The ultra-thin copper foil of the present invention can be produced continuously without tearing, achieving a double breakthrough in the ultra-thin thickness and mechanical properties of the copper foil.

The invention relates to the field of chemical engineering, and particularly discloses multi-component composite coated titanium dioxide and a preparation method thereof. The preparation method of the titanium dioxide comprises the following steps: S1, mixing titanium dioxide slurry with a silicate solution, and then controlling the pH value by using an inorganic acid solution twice; s2, adding a zirconate solution within a certain period of time, and controlling the pH value by using an alkali solution; s3, adding a meta-aluminate solution within a certain period of time, and meanwhile, adding an inorganic acid solution in a countercurrent manner to control the pH value; s4, continuously adding a meta-aluminate solution within a certain period of time, and simultaneously adding an aluminum sulfate solution in a downstream manner to control the pH value; and S5, adjusting the pH value at the end point, continuously stirring and curing, and then homogenizing, filtering, washing, dehydrating, drying, crushing and carrying out organic treatment. The titanium dioxide prepared by the invention is relatively good in optical performance index and weather resistance, and can meet the development requirements of coatings in the fields of ships, bridges, solar energy, wind power and the like which are high in weather resistance and emerging in environmental protection.

The invention provides a metal organic sulfonic acid-based solid acid catalyst applied to nylon 6 recovery and depolymerization and a preparation method thereof, and realizes upgrading and recovery of waste nylon 6. The main contents are as follows: (1) a structural design and a preparation method of the metal organic framework sulfonic acid-based solid acid catalyst; and (2) the solid acid is used for catalytic depolymerization of nylon 6. The problems that equipment corrosion is aggravated by inorganic acid in the nylon 6 recovery process and a liquid-phase catalyst is difficult to separate and recover are solved, and the application prospect is good.

The invention provides a detoxification method and system based on nanofiltration treatment of lithium ore smelting slag, and the method comprises the following steps: step S1: carrying out acid leaching treatment on the lithium ore smelting slag by using an inorganic acid liquid, so that acid-soluble components in the lithium ore smelting slag are dissolved in the inorganic acid liquid to obtain an acid leaching liquid and detoxified smelting slag; s2, the acid leaching solution is subjected to oxidation treatment, metal ions with intermediate valence in the acid leaching solution are oxidized into metal ions with high valence, and an oxidized acid leaching solution is obtained; s3, carrying out nanofiltration treatment on the oxidized pickle liquor to intercept high-valence metal ions in the oxidized pickle liquor so as to obtain concentrated liquor and permeate liquor; s4, using the permeate liquid as the inorganic acid liquid in the step S1 for acid leaching treatment. According to the method, toxic components in the lithium ore smelting slag can be fully separated, and resource utilization is easier.

The invention provides an electrolytic etching solution, an electrolytic etching method, a metal-plastic composite material and electronic equipment, and the electrolytic etching solution comprises 5-20 wt% of bromide, 1-10 wt% of inorganic acid, 1-5 wt% of a complexing agent, 0.1-5 wt% of a wetting agent, 1-10 wt% of a corrosion inhibitor, 1-5 wt% of conductive salt and 60-75 wt% of a solvent on the basis of the total mass of the electrolytic etching solution. The bromide, the inorganic acid, the complexing agent, the wetting agent, the corrosion inhibitor, the conducting salt and the solvent are efficiently compounded, and the metal material surface treatment agent can be used for metal material surface treatment.

The embodiment of the invention provides a lithium slag-based composite cementing material and a preparation method thereof, and relates to the field of composite materials. The preparation method of the lithium slag-based composite cementing material comprises the following steps that S100, lithium slag and an inorganic acid solution are mixed and then activated, an activated material is obtained, and the component of the lithium slag comprises aluminosilicate; s200, an alkaline substance and the activated material are mechanically mixed, a modified material is obtained, the pH of the modified material is 7-10, then the modified material is dried, and modified powder is obtained; and S300, grinding the modified powder and auxiliary materials to obtain the lithium slag-based composite cementing material. The preparation method provided by the invention is high in lithium slag mixing amount and relatively low in cost, and the prepared lithium slag-based composite cementing material is also relatively high in compressive strength.

The invention provides a method for preparing analcime from lithium slag, and belongs to the field of zeolite preparation. The method comprises the following steps: acid pickling and impurity removal: mixing lithium slag with an inorganic acid solution, stirring and reacting at 50-70 DEG C for 0.5-3 hours, and then filtering, washing and drying in sequence to obtain impurity-removed lithium slag; activation: mixing the impurity-removed lithium slag with a NaOH solution, carrying out continuous stirring reaction at 75-95 DEG C for 35-72 hours, and aging for 10-30 minutes to obtain a mixture colloid; and crystallization: carrying out hydrothermal reaction on the mixture colloid at 110-130 DEG C for 24-72 hours, and then sequentially filtering, washing and drying to obtain the analcime crystal material. According to the method, the lithium slag obtained after leaching and lithium extraction of spodumene by a sulfuric acid method is taken as a raw material, and on the basis of not calcining and activating and not additionally adding the raw material, the NaOH concentration, the activation temperature and time during activation and the temperature and time during hydrothermal reaction are controlled, so that the high-purity analcime crystal can be obtained.

The invention provides a method for preparing battery-grade iron phosphate by recovering iron phosphorus slag based on ultrasonic induced crystallization, and belongs to the field of waste lithium ion battery recovery and metallurgical environmental engineering. The method comprises the following steps: leaching the iron-phosphorus slag by adopting an inorganic acid, and filtering after the reaction is finished, so as to obtain a leaching solution containing iron and phosphorus; deionized water is added into the leachate for dilution, then the temperature is increased, and a crystallization reaction is carried out under the assistance of ultrasonic waves; after the crystallization reaction is finished, filtering to obtain iron phosphate dihydrate precipitate and crystallization mother liquor, concentrating the crystallization mother liquor, returning to recycle, and dehydrating the iron phosphate dihydrate at high temperature to obtain the battery-grade anhydrous iron phosphate. According to the method, the battery-grade iron phosphate can be efficiently prepared, resource recycling and high-value utilization of iron and phosphorus elements in the iron-phosphorus slag are achieved, and the method has the advantages of being short in process, recyclable in solution system, free of wastewater discharge and the like and has good application prospects.

The invention relates to cerium dioxide and a preparation method and application thereof, and the preparation method of the sphere-like cerium dioxide comprises the following steps: (1) carrying out first mixing on cerium salt, doped metal salt, a solvent, inorganic acid and organic acid to obtain a first mixture; the doped metal salt comprises praseodymium salt and / or neodymium salt; (2) under a hydrothermal condition, carrying out second mixing on the first mixture, ammonia water and ammonium salt to obtain a second mixture with the pH value of 8-10, and carrying out sol-gel reaction to obtain sphere-like cerium dioxide sol; and (3) carrying out post-treatment on the sphere-like cerium dioxide sol to obtain the sphere-like cerium dioxide. According to the preparation method of the sphere-like cerium dioxide, provided by the invention, a mixing process and a reaction process of cerium salt and specific raw materials are designed, so that the sphere-like cerium dioxide with regular particle shape, good size uniformity and high purity and crystallinity is obtained.

The invention belongs to the technical field of preparation of retinol derivatives, and particularly relates to a preparation method and application of a retinol derivative. The preparation method provided by the invention comprises the following steps: 1) mixing hydroxyethyl cellulose powder, water, inorganic acid and an oxidizing agent, carrying out heating reaction, and after the reaction is finished, cooling, filtering, washing and drying to obtain oxidized cellulose; 2) mixing and stirring retinol powder and hydroxyl silicone oil, and filtering after stirring to obtain hydroxyl silicone oil coated retinol; and 3) mixing the oxidized cellulose, the hydroxyl silicone oil coated retinol, a catalyst and a first organic solvent, carrying out a heating reaction, carrying out ultrasonic treatment on the reaction liquid after the reaction is finished, filtering after the ultrasonic treatment is finished, concentrating the filtrate, extracting with a second organic solvent, and drying the extract liquid to obtain the retinol derivative. The retinol derivative prepared by the invention has excellent photo-thermal stability.

The invention belongs to the field of waste artificial graphite regeneration, and particularly relates to a waste artificial graphite regeneration method, a regenerated material and application thereof, the regeneration method comprises the following steps: carrying out normal pressure liquid phase modification on waste artificial graphite in an organic acid solution in advance, and then putting the modified waste artificial graphite in an inorganic acid solution for positive pressure liquid phase modification to prepare a modified material; mixing the modified material with a Mn source, a metal N source, a first carbon source and a binder to obtain a mixture, then performing heat treatment on the mixture in a hydrogen-containing atmosphere, and then performing negative-pressure annealing treatment to obtain a heat-treated material; the metal N source comprises a compound of at least one of iron, cobalt and nickel; and mixing the heat-treated material with lithium salt and a second carbon source, and carrying out roasting treatment to obtain the graphite regenerated material. The regeneration method disclosed by the invention is particularly suitable for repairing the artificial graphite waste which is difficult to treat, so that the artificial graphite waste can be repaired to obtain a material with excellent capacity, long circulation and particularly low-temperature stability.

The invention relates to a composite reverse osmosis membrane acidic cleaning agent, a preparation method and a cleaning process thereof, and belongs to the technical field of environment-friendly water treatment. The cleaning agent comprises the following components in percentage by mass: 4-8% of inorganic acid, 20-40% of organic acid, 1-3% of a surfactant, 0.5-1% of a chelating agent, 0.5-1% of a compound corrosion inhibitor and the balance of deionized water. The composite corrosion inhibitor is formed by compounding 2-mercaptobenzothiazole and the like according to a specific mass ratio, the molecular weight of polyaspartic acid is 5000, and the molar ratio of Zn to Mo in the zinc-molybdate compound is 2: 1. The preparation method comprises the following four steps: firstly preparing a compound corrosion inhibitor premix, then preparing an acidic base solution, and then sequentially adding the components to finally obtain the cleaning solution. According to the cleaning process, a cleaning agent and deionized water are mixed, the membrane flux recovery rate is larger than or equal to 85% through cleaning of a specific process, the reverse osmosis membrane can be effectively cleaned, and the performance of the reverse osmosis membrane can be recovered.

The invention relates to retarded acid for a carbonate rock reservoir and application thereof, and aims to solve the problems of poor high temperature resistance and too high acid rock reaction rate of the current retarded acid for the carbonate rock reservoir. The retarded acid for the carbonate rock reservoir comprises an acid agent, a functional aid and water; the acid agent comprises inorganic acid, organic acid, a chelating agent and organic ester in a mass ratio of 1: (10-13): (5-6): (3-4). According to the retarded acid provided by the invention, the acid agent is specifically designed, and the inorganic acid, the organic acid, the chelating agent and the organic ester in a specific ratio are matched, so that the retarded acid has high temperature resistance, and meanwhile, the problem that the acid-rock reaction rate is too high is avoided. And the deep transformation of the acid liquid in the reservoir is realized under the clamping of a low acid rock reaction rate. And by means of the high resistance reduction capacity after weight increasing, it is guaranteed that the construction operation pressure is reduced in the deep well and ultra-deep well reservoir transformation process, and therefore the efficient reservoir transformation capacity is achieved.

The invention discloses an actinide purification method and device, and belongs to the technical field of medical radioactive isotope separation and purification. The method comprises the following steps: passing a thorium target solution containing actinide through a cation exchange column, and leaching with inorganic acid to obtain a first effluent containing Ac < 3 + >; enabling the first effluent containing the Ac < 3 + > to pass through a TK221 resin extraction column to obtain a second effluent containing the Ac < 3 + >; the second effluent containing Ac3 + passes through a TRU resin extraction column, and actinide is obtained. The TK221 resin also contains phosphine oxide and a small amount of long alkyl chain alcohol on the basis of diglycolamide, and shows better performance on purification of Ac < 3 + >. Meanwhile, the elution acidity in the TRU resin separation process is properly improved, and the outflow speed of Ac, La and Ce can be delayed, so that the effect of separating Ac from La and Ce is achieved, and the yield of 225Ac is improved while the concentration of metal impurities is reduced.

The invention relates to the technical field of thallium recovery and treatment, in particular to a method for efficiently recovering thallium from a complex solution. The invention discloses a method for efficiently recovering thallium in a complex solution. The method comprises the following steps: S1, multi-stage replacement; a metal displacer is added into the thallium-containing feed liquid, a multi-stage displacement reaction is carried out, and the pH value during the multi-stage displacement reaction is 3-5; after the reaction is finished, separating to obtain thallium-removed feed liquid and thallium-containing solid; s2, dissolving; dissolving the thallium-containing solid with an inorganic acid to form a thallium-containing solution; s3, oxidizing and precipitating; and adding an oxidizing agent into the thallium-containing solution, adjusting the pH value of the solution to 1-3 after the oxidation is finished, generating a precipitate, and separating to obtain a thallium hydroxide solid. The method disclosed by the invention is wide in application range, can be used for treating thallium-containing wastewater with various concentrations, is simple in process and easy to implement, and meanwhile, thallium and other valuable metals can be recycled, so that efficient recovery and utilization of resources are realized.

The invention relates to a low-cost high-stability urease inhibitor and a preparation method and application thereof.The preparation method includes the steps that montmorillonite is modified with inorganic acid to obtain inorganic acid modified montmorillonite, then hydrogen ions in the inorganic acid modified montmorillonite are exchanged with a cationic surface active agent to obtain quaternary ammonium salt surface active agent modified organic montmorillonite, and the quaternary ammonium salt surface active agent modified organic montmorillonite is used for preparing the urease inhibitor. After montmorillonite is subjected to organic modification, the hydrophobicity is greatly improved, and the organic modified montmorillonite has hydrophilicity and hydrophobicity. The organic modified montmorillonite interacts with amino acid residues in a urease flap region due to the hydrophobic effect, so that the amino acid residues are gathered in the organic modified montmorillonite due to the hydrophobic effect, urease conformational change is caused, catalytic activity on urea is lost, and the organic modified montmorillonite has a remarkable urease inhibition effect, is stable in chemical property and non-toxic in material, and can be used for preparing a novel urease inhibitor. The fertilizer is easy to disperse in fertilizer and soil and low in price.

The invention relates to the technical field of pendimethalin wastewater treatment, in particular to a pendimethalin wastewater treatment method which comprises the following steps: step 1, adding ferrous oxide or ferrous hydroxide into wastewater, and adjusting the pH value of the wastewater to be neutral; 2, adjusting the pH value of the primary filtrate to 2-5 by using an inorganic acid, and adding an iron-carbon mixture with the mass ratio of 1: (0.5-2) to carry out an oxidation-reduction reaction; and step 3, introducing the secondary filtrate into 2-5 reaction kettles which are connected in series, and adding hydrogen peroxide for 1-3 times according to the mass ratio of hydrogen peroxide to COD (Chemical Oxygen Demand) of (15-25): 1. According to the pendimethalin wastewater treatment method provided by the invention, the iron-carbon mixture generates a primary battery effect in the solution, nitrate radicals can be quickly reduced into nitrogen oxides or ammonia gas, the nitrate radicals are efficiently and quickly treated, and meanwhile, iron ions and ferrous ions can finally generate corresponding hydroxides to be separated out.

The present invention provides a method for preparing analcime using lithium slag, and belongs to the field of zeolite preparation. The method comprises the following steps: acid washing and impurity removal: mixing the lithium slag with an inorganic acid solution, stirring and reacting at 50-70°C for 0.5-3h, and then filtering, washing, and drying in sequence to obtain the lithium slag after impurity removal; activation: mixing the lithium slag after impurity removal with a NaOH solution, stirring and reacting continuously at 75-95°C for 35-72h, and aging for 10-30 min to obtain a mixture colloid; crystallization: hydrothermally reacting the mixture colloid at 110-130°C for 24-72h, and then filtering, washing, and drying in sequence to obtain analcime crystal material. The method uses lithium slag after lithium extraction by leaching of spodumene sulfuric acid method as raw material, and can obtain high-purity analcime crystals by controlling the NaOH concentration, activation temperature and time during activation, and the temperature and time during hydrothermal reaction without calcination activation and without adding raw materials.

The invention discloses an aluminum-based circuit acidic etching solution, which relates to the technical field of etching, and comprises the following components by mass concentration: 30-60 g / L of composite inorganic acid, 10-20 g / L of a wetting agent, 5-15 g / L of a stabilizer, 5-15 g / L of an accelerator, 6-15 g / L of a brightener, 0.5-2.5 g / L of a composite anti-lateral corrosion agent, and 2-4 g / L of a complexing agent. According to the acid etching solution for the aluminum-based circuit, the lateral etching rate of a 50-75-micron thin circuit can be lower than 30%, the etching rate is stable, the etched appearance is bright and uniform, and the circuit does not have a burr phenomenon; the wetting agent is added, so that the etching uniformity can be improved, the burr phenomenon can be prevented, the adsorption rate of inorganic acid can be increased for the burr part which is difficult to treat, and the corrosion efficiency of the burr part can be improved; by adding the brightener, the phenomena of uneven partial etching and blackening of the surface after etching can be solved.

The invention discloses a process for producing oligosaccharide from lignocellulose and performing acid circulation, which comprises the following steps of: (1) performing swelling reaction on the lignocellulose by using more than 70wt% of inorganic acid solution to obtain high-acid biomass candy pomace; (2) extracting the high-acid biomass candy pomace with an organic solvent to obtain low-acid biomass candy pomace and an acid-containing organic phase; (3) removing insoluble substances of the low-acid biomass candy pomace to obtain an oligosaccharide solution; and (4) adding water into the acid-containing liquid obtained in the step (2) for reverse extraction, standing and layering to obtain an acid solution and an organic phase. According to the method, the acid in the high-acid and solid biomass candy pomace is effectively recycled, the process is efficient and mild, energy does not need to be additionally provided, and all used reagents can be recycled and reused.

The invention relates to the technical field of immunodetection and immunodiagnosis, in particular to a chemiluminescence substrate solution, a chemiluminescence detection kit and a detection method. The chemiluminescent substrate solution comprises a substrate solution 1, or comprises the substrate solution 1 and a substrate solution 2, the substrate solution 1 comprises sodium hydroxide, a surfactant and a blue light absorbent for absorbing blue light with the wavelength of 400-500 nm; the substrate solution 2 comprises inorganic acid and hydrogen peroxide. According to the application, the blue light absorbent is added into the chemiluminescent substrate liquid, so that blue light emitted by acridinium ester can be absorbed, a luminescent signal is reduced, and particularly, the luminescent value of a background caused by non-specific adsorption is reduced, so that the signal-to-noise ratio is increased.

The embodiment of the invention provides a method for detecting the content of acrylamide in polyacrylamide and application of the method. The detection method comprises the following steps: respectively reacting acrylamide standard solutions with different concentrations with an inorganic acid solution and thiosalicylic acid in a water bath to obtain standard samples with different concentrations; performing high performance liquid chromatography ultraviolet detection on the standard samples with different concentrations to obtain peak areas of acrylamide in the standard samples with different concentrations, and obtaining a linear equation of a corresponding relationship between the concentration x and the peak area y; performing high performance liquid chromatography ultraviolet detection on the to-be-detected sample to obtain the peak area of acrylamide in the to-be-detected sample; and substituting the peak area of acrylamide in the to-be-detected sample into the linear equation, and calculating to obtain the concentration of acrylamide in the to-be-detected sample, the detection method provided by the embodiment of the invention is convenient to operate, and the separation effect, the detection accuracy and the precision can be effectively improved.

The invention discloses stable silicon dioxide microspheres as well as a preparation method and application thereof. Mixing a sodium silicate diluent and an organic acid aqueous solution to form colloidal particles, and carrying out a sol-gel reaction to obtain silica sol; the preparation method comprises the following steps: in an air environment, throwing silica sol into water under stirring to form microspheres, injecting inorganic acid into the water at the same time, then injecting a sodium silicate diluent for reaction, and then adjusting the pH value of the system to 6-7; and aging, washing, drying and roasting to obtain the silicon dioxide microspheres. The preparation method comprises the following steps: mixing a sodium silicate diluent and an organic acid aqueous solution by an acid mixing method, granulating by air to form microspheres, and finally injecting inorganic acid to quickly remove heat, reduce pressure drop and maintain the state of the microspheres, thereby obtaining the stable silicon dioxide microspheres. The porous silicon dioxide microsphere with larger surface area and pore volume is obtained, has better catalytic performance when being used as a catalytic oxidation carrier, and has the advantages of high conversion rate and high stability.

The invention provides a wet treatment process for laterite-nickel ore. The wet treatment process comprises the following steps: S1, carrying out acid leaching treatment on the laterite-nickel ore by adopting inorganic acid to obtain leached ore pulp; s2, the leached ore pulp is sequentially subjected to liquid-solid separation and countercurrent washing, and washed pulp and leached residues are obtained; s3, a first oxidizing agent and a first neutralizing agent are added into the washed slurry for iron and aluminum removal treatment, and a solution with iron and aluminum removed and iron and aluminum slag are obtained; s4, carrying out nickel and cobalt precipitation treatment on the solution subjected to iron and aluminum removal, so as to obtain precipitated slurry; s5, continuously carrying out dense separation treatment on the precipitated slurry to obtain underflow and overflow; and S6, the underflow is subjected to washing aftertreatment in sequence, and a cobalt nickel hydroxide product is obtained. The invention provides a short-process wet treatment process for laterite-nickel ore, the production cost and energy consumption are reduced, and meanwhile, the recovery rate of nickel and cobalt, the overall recovery rate of scandium and the quality of nickel-cobalt oxide products are improved.

The invention discloses a method for determining the content of total carbon, inorganic carbon and organic carbon in titanium tetrachloride, and belongs to the technical field of analytical chemistry. The determination method comprises the following steps: under inert atmosphere protection and a low-temperature environment, adding a titanium tetrachloride sample into an inorganic acid solution, fully hydrolyzing, and fixing the volume to obtain hydrolysate; analyzing the concentration of total carbon and inorganic carbon in the hydrolysate by using a TOC (Total Organic Carbon) analyzer; and calculating the contents of total carbon, inorganic carbon and organic carbon in the titanium tetrachloride sample according to the concentrations of total carbon and inorganic carbon in the hydrolysate. According to the method, inorganic carbon and total carbon in the hydrolysate can be directly measured, the content of organic carbon is calculated through a difference value method, and accurate typing of carbon forms is achieved. The method is simple to operate, short in detection period, high in efficiency and lower in cost. The method can effectively solve the problem that blind areas exist in impurity traceability and accurate control due to the fact that detection data of total carbon, inorganic carbon and organic carbon cannot be accurately separated through an existing method for measuring the carbon-containing compounds in titanium tetrachloride.

The invention discloses a refining method of a norepinephrine bitartrate intermediate. The refining method of the norepinephrine bitartrate intermediate comprises the following steps: S1, reacting a crude product of the norepinephrine bitartrate intermediate 3 with inorganic acid in an organic solvent to obtain inorganic acid salt of the norepinephrine bitartrate intermediate 3; s2, in the presence of an antioxidant, enabling the inorganic acid salt of the norepinephrine bitartrate intermediate 3 to react with inorganic alkali in water to obtain a refined product of the norepinephrine bitartrate intermediate 3; the structural formula of the norepinephrine bitartrate intermediate 3 is as shown in formula I in the specification. # imgabs0 #

A method of producing a magnetic powder includes performing a phosphorus treatment to obtain a phosphorus compound and a rare earth-iron-nitrogen-based magnetic powder, the phosphorus treatment including adding an inorganic acid to a slurry containing: a rare earth-iron-nitrogen-based magnetic powder containing R, Fe, and N, where R represents at least one of rare earth elements selected from the group consisting of Y, Ce, Pr, Nd, Gd, Tb, Dy, Ho, Er, Tm, Lu, and Sm, and if R contains Sm, Sm constitutes less than 50 atm % of a total R atomic content; water; and a phosphorus-containing substance.