45 results about "CHROMIC NITRATE" patented technology

The invention relates to the technical field of preparation methods of nano precursor powder, in particular to a synthesis method of Cr < 3 + > doped magnesium aluminum oxide nano powder, which comprises the following steps: weighing magnesium nitrate, aluminum nitrate and chromic nitrate according to the stoichiometric ratio of MgAl2-xO4: xCr < 3 + >; stirring and mixing the prepared magnesium nitrate solution, aluminum nitrate solution and chromic nitrate solution together to prepare a mixed solution I; ammonia water is dripped into the first mixed solution, then the first mixed solution dripped with the ammonia water is stirred and mixed, and a second mixed solution is prepared; pouring the mixed solution II into a high-pressure reaction kettle, and putting the high-pressure reaction kettle into a constant-temperature box for reaction to prepare a white precipitate; adding deionized water into the white precipitate for washing and precipitating, and centrifuging to obtain white precipitate powder; drying the white precipitate powder at a constant temperature; calcining the dried white precipitate powder to prepare nano precursor powder; the prepared nanometer precursor powder has the advantages of being high in purity and small in particle size.

The invention discloses a catalyst Cr, Co-Ni (OH) 2 (at) NF based on a nickel base. The catalyst is prepared by taking foamed nickel (NF) as a carrier and doping Cr and Co elements, has efficient urea oxidation reaction (UOR) performance, and can be used for hydrogen production by electrolysis of water and urea pollution treatment. The preparation method comprises the following steps: soaking nickel foam in an HCl solution, soaking the nickel foam in a nickel salt solution with a specific concentration for reaction to generate nickel-based hydroxide, and soaking the nickel-based hydroxide in a solution containing chromic nitrate and cobalt potassium cyanide for reaction to finally generate the catalyst doped with Cr and Co. The catalyst shows low overpotential and good stability in a 1M KOH + 0.33 M urea solution, the overpotential of an anode for hydrogen production through electrolysis of water is remarkably reduced, and meanwhile efficient degradation of urea is achieved.

The invention relates to the technical field of carbon capture materials, in particular to a choline chloride-based carbon capture material and a preparation method thereof. The preparation method comprises the following steps: dissolving terephthalic acid in water, adding choline chloride with different concentrations, uniformly stirring, adding chromic nitrate, oscillating in an ultrasonic oscillator for 30 minutes, dropwise adding hydrofluoric acid with the concentration of 40% while stirring, adding reactants into a reaction kettle, and reacting at 220 DEG C for 8 hours to obtain the choline chloride-based carbon capture material n-CHCl-MIL-101 (Cr). According to the invention, the influence of the concentration of choline chloride on the material structure and CO2 adsorption performance is researched, and the result shows that the change trend of the CO2 adsorption capacity is volcanic along with the increase of the concentration of choline chloride, the CO2 adsorption capacity of 0.075-ChCl-MIL-101 (Cr) is optimal, and the unique pore cage structure of MIL-101 (Cr) can well adsorb CO2.

The invention relates to the technical field of sodium ion battery positive electrode materials, and discloses a preparation method of a high-entropy sodium vanadium phosphate electrode, which comprises the following steps: step 1, adding 2.7 g of ammonium vanadate and 16.8 g of oxalic acid into 200 mL of deionized water, and stirring to react for 20-80 minutes at the temperature of 60-120 DEG C; 2, after slight cooling, 0.75 g of ferric nitrate, 0.81 g of manganese nitrate, 0.80 g of chromic nitrate, 0.58 g of cobalt nitrate and 0.49 g of nickel nitrate which are dissolved with 100 mL of deionized water are added; and step 3, after stirring, adding 8.3 g of sodium dihydrogen phosphate which is dissolved by 100mL of deionized water. The precursor is prepared by adopting a chemical synthesis method, and the high-entropy metal doped sodium vanadium phosphate positive electrode material is prepared by adopting a Joule thermal process. Compared with a traditional calcination process, the process has the advantages of high heating speed, low energy consumption, mild reaction conditions, high product purity, good particle size uniformity, easiness in control of the proportion of each component and the like, and continuous preparation can be realized.

The invention relates to an electroplated coating protective agent and a preparation method thereof, and belongs to the technical field of electroplated coating protective agents, and the protective agent comprises the following raw materials: main salt, auxiliary salt, a composite complexing agent, 1-docosanethiol, a sealing agent, absolute ethyl alcohol and deionized water. The succinic acid, the N-sodium lauroyl sarcosinate and the citrazinic acid are used as the composite complexing agent, and starting from different aspects of activating the surface of the coating, accelerating the growth of the protective film layer and increasing the compactness of the protective film layer, the prepared protective agent can effectively improve the corrosion resistance effect of the coating; and the added 1-docosanethiol is used for reducing the defect area of the protective film layer and further effectively improving the corrosion resistance of the protective film. Besides, chromic nitrate is used as a main salt, cerous sulfate and sodium molybdate are used as auxiliary salts, and sodium silicate is used as a sealing agent, so that the prepared protective agent can effectively have remarkable salt spray resistance, and meanwhile, the appearance quality of a formed film layer can also be improved.

The invention relates to the field of ceramic ink, and discloses a black pigment, ceramic ink prepared from the black pigment and a preparation method of the ceramic ink. The high-tinting-strength cobalt black pigment is prepared by adopting cobalt nitrate, nickel nitrate, chromic nitrate and ferric nitrate according to the molar ratio of 38: 6: 31: 25, co-precipitating, drying to obtain powder, and calcining at the temperature of 1100-1200 DEG C to obtain the high-tinting-strength cobalt black pigment. The ink prepared from the high-tinting-strength cobalt black pigment prepared by the preparation method disclosed by the invention is pure in hue and strong in tinting strength, is particularly suitable for producing dark-color ceramic tile layout products such as black golden flowers and the like, and can well solve the problem that the black color is not pure enough.

The invention provides a ceramic impurity removal method and a ceramic product, a ceramic green body is subjected to first-stage heat treatment and cooling treatment, and the ceramic green body subjected to first-stage treatment is obtained; sequentially impregnating and drying the ceramic green body treated in the first stage by adopting a chromic nitrate solution to obtain a completely dried impregnated ceramic green body; performing second-stage heat treatment and cooling treatment on the completely dried impregnated ceramic green body to obtain a ceramic green body subjected to second-stage treatment; performing sintering treatment on the ceramic green body subjected to the second-stage treatment to obtain a ceramic product; the process is simple, efficient degumming can be achieved, generation and deposition of harmful substances in the sintering process can be effectively reduced, and the rejection rate of ceramic products due to bending is reduced.

The invention discloses a black quartz glass material and a preparation method thereof, and relates to the technical field of quartz glass preparation, the black quartz glass material is prepared from the following raw materials by weight: 0.8 wt%-3.8 wt% of a trace element additive, 0.01 wt%-0.05 wt% of a fluxing agent, and the balance of high purity quartz sand; the trace element additive is prepared from the following components in parts by weight: 0.03 to 0.05 part of strontium nitrate, 1 to 3 parts of titanium nitrate, 1 to 2 parts of manganous nitrate, 2 to 3 parts of ferric nitrate, 0.1 to 0.3 part of soluble rare earth salt, 0.05 to 0.1 part of nickel nitrate, 0.03 to 0.05 part of chromic nitrate, 0.05 to 0.08 part of niobium oxalate and 0.03 to 0.05 part of tantalum chloride. The glass material is good in color uniformity, stable in optical performance, simple in preparation process and low in thermal expansion coefficient.

The invention discloses a method for preparing a chromium oxide solid solution coating by adopting a physical vapor deposition process, which comprises the following steps of: firstly, mixing chromium nitrate nonahydrate serving as a chromium source and a polyether compound serving as a dispersing solvent by utilizing a coprecipitation method, and adding a stabilizer to prepare a chromium ion solution with a preset concentration; then dropwise adding a precipitator into a chromium ion solution with a preset concentration, uniformly stirring to obtain a Cr (OH) 3 suspension, naturally precipitating at room temperature, then centrifuging, washing, drying, sieving and carrying out heat treatment to obtain nano chromium oxide powder, and finally building a physical vapor deposition device to obtain the chromium oxide nano material. And depositing on the surface of the alumina ceramic under a high-temperature pressureless sintering condition to obtain the chromium oxide solid solution coating. The preparation process is simple and easy to operate, the repeatability is high, the chromic oxide solid solution coating is uniform, the solid solution degree is controllable, and the prepared coating is uniform in morphology, low in secondary electron emission coefficient and capable of being used in the fields of electric vacuum devices, high-voltage-resistant insulating materials and the like.

The present invention relates to a water-resistant, sulfur-resistant, and poison-resistant ultra-low temperature denitration catalyst and a preparation method thereof, and belongs to the technical field of flue gas denitration catalysts. The mixture of copper nitrate, nickel nitrate, and chromium nitrate in the catalyst synergizes with rubidium nitrate, and after mixing, extrusion, and roasting, a highly active catalytic center is formed, which can effectively promote NO at low temperatures. x The reduction reaction improves the low-temperature activity of the catalyst; the ZSM‑5 molecular sieve and titanium dioxide in the catalyst carrier have excellent selectivity and hydrophobicity, which can effectively prevent SO2, SO3, water molecules, etc. from occupying and destroying the active sites of the catalyst. The addition of silane coupling agent KH550 further enhances the sulfur and water resistance of the carrier, so that the catalyst can still maintain a high catalytic activity in a sulfur-containing and water-containing flue gas environment; the auxiliary agent ammonium heptamolybdate in the catalyst helps to improve the catalyst's anti-poisoning ability.

The invention discloses a fireproof flame-retardant plastic and a preparation method thereof, and relates to the technical field of plastics. The modified flame retardant is innovatively added into the polyolefin plastic, so that efficient flame-retardant and fireproof effects are achieved. The modified flame retardant is prepared by coating and modifying layered hydroxides with prepolymers of 1, 2-diallyl phthalate and diallylmalonic acid when ferric nitrate and chromic nitrate are subjected to coprecipitation to generate layered hydroxides, and has the effects of inhibiting smoke diffusion and blocking oxygen, so that the flame-retardant and fireproof effects are realized, and meanwhile, the flame-retardant and fireproof effects are realized. When the plastic is subjected to shrinkage or external stress caused by high temperature, the layered structure can be used as a stress dispersion center, so that the plastic can still keep relatively good mechanical properties at high temperature, and a molecular skeleton of the polymer contains a plurality of rigid benzene rings, so that the stability in a high-temperature environment can be improved, and the flame-retardant and fireproof effects of the plastic can be enhanced.

The invention discloses a graphene-doped high-entropy Prussian blue analogue material as well as a preparation method and application thereof, and belongs to the technical field of materials. The preparation method comprises the following steps: preparing a high-entropy Prussian blue analogue from nickel nitrate hexahydrate, iron nitrate nonahydrate, cobalt nitrate hexahydrate, chromium nitrate nonahydrate, zinc nitrate hexahydrate, potassium ferricyanide and graphene to form a turbid liquid, collecting a solid material in the turbid liquid by using a centrifugal method, cleaning with ethanol and deionized water, and drying to obtain the high-entropy Prussian blue analogue. And drying and grinding to obtain the high-entropy prussian blue analogue material which can effectively perform electro-catalytic oxygen evolution under an alkaline condition. The graphene-doped high-entropy Prussian blue analogue is prepared by a coprecipitation method, and the method has the characteristics of simplicity in operation, short preparation period, low cost and the like, and is beneficial to popularization and application.

The invention relates to the field of passivation solutions, and particularly discloses a trivalent chromium black zinc passivation solution free of fluorine, nickel and phosphorus and a preparation process of the trivalent chromium black zinc passivation solution. The passivation solution comprises the following components: 400-600 g of pure water, 10-15 g of chromic nitrate, 1-3 g of maleic acid, 2-4 g of tartaric acid, 3-5 g of citric acid, 1.5-3 g of borax, 3-5 g of sulfosalicylic acid, 5-8 g of ferrous sulfate, 4-6 g of sodium nitrate, 2-4 g of a corrosion inhibitor, 1-1.5 g of a membrane surface conditioning agent, 1-3 g of an antioxidant and 2-5 g of a blackening enhancer. A complexing system is adopted to stabilize release of trivalent chromium ions, a passivation film layer is compact, uniform and not prone to floating, stable generation of the passivation film is facilitated, the passivation time range is wide, and the corrosion inhibitor is added for efficient corrosion inhibition; the blackening effect of the combined action of the blackening enhancer containing the molybdenum element and ferrous ions is adopted, and through the synergistic effect of the corrosion inhibitor, the blackening enhancer and other raw materials, the existing technical problems that an existing passivation solution is poor in appearance texture, high in equipment corrosion, insufficient in environmental protection property, low in film forming stability, high in blackening system cost, large in pollution and the like are solved.

The invention provides a preparation method of a hole sealing coating for a plasma spraying thermal barrier coating, and relates to the technical field of high-temperature thermal insulation materials. The hole sealing coating comprises the following raw materials in parts by weight: 40-50 parts of ammonia water (with the concentration of 25%), 30-50 parts of enamel powder, 30-50 parts of functional powder, 20-30 parts of zirconium oxychloride, 20-30 parts of yttrium chloride, 5-10 parts of ytterbium nitrate, 5-10 parts of gadolinium nitrate, 5-10 parts of dysprosium nitrate, 5-10 parts of chromic nitrate, 5-10 parts of tantalum pentoxide, 5-10 parts of niobium pentoxide, 3-5 parts of titanium dioxide, 3-5 parts of silicon dioxide, 3-5 parts of a binder, 60-90 parts of absolute ethyl alcohol and 40-60 parts of a solvent. The nano ceramic powder is prepared by using a hydrothermal reaction method, then the enamel powder, the nano ceramic powder and the like are mixed, wet grinding, drying, tabletting and calcining are performed to prepare a ceramic block which is applied to film plating, and the hole sealing coating is high in density and bonding strength, and can slow down the transmittance of oxygen, improve the oxidation resistance, improve the radiation coefficient of the coating and prolong the service life.

The invention discloses a high-wear-resistance and corrosion-resistance sintering machine grate and a preparation method thereof, and belongs to the technical field of metallurgical materials. The method comprises the following steps: selecting polystyrene foam plastic to prepare a foam model; the preparation method comprises the following steps: preparing high-entropy oxide nano powder from ferric nitrate, chromic nitrate, nickel nitrate, manganous nitrate and ammonium molybdate according to a mass ratio, stirring, precipitating, drying, calcining and ball-milling to obtain powder; preparing a water-based binder from polyvinyl alcohol, hydroxypropyl methyl cellulose, lauryl sodium sulfate, p-benzoquinone imine and deionized water according to a mass ratio; preparing an inner-layer coating solution from high-entropy oxide nano powder and a binder in proportion, dip-coating the foam model, and drying to form an inner layer; preparing an outer layer coating solution from nano chromium powder and a binder according to a ratio, and performing dip-coating and drying to form an outer layer; filling refractory sand, pouring high-chromium cast iron alloy melt, and demolding; and tempering at low temperature and strengthening the nano permeation layer. The grate substrate and the double-layer nano coating are cooperated, so that the service life is prolonged, and the cost is reduced.

The invention belongs to the technical field of metal surface treatment, and discloses an efficient and low-corrosivity ash removal agent as well as a preparation method and application thereof. The ash removal agent comprises the following components: organic acid, an oxidizing agent, organic amine ester TPP, methylbenzotriazole, polyaspartic acid, a complexing agent, a nonionic surfactant and water. The ash removal agent is high in ash removal efficiency and small in corrosion to an aluminum (alloy) matrix, and meanwhile, the ash removal agent does not contain nitric acid, chromic anhydride and other ammonia nitride components which severely pollute the environment.

The invention discloses a production method of high-content p-menthane, a crude p-menthane product is produced by using a catalyst and a dipentene hydrogenation method, the crude p-menthane product is rectified by a rectification device to obtain a high-content p-menthane product, the raw material is dipentene, the catalyst is a high-performance alumina-loaded nickel-chromium catalyst, and the catalyst is a high-performance alumina-loaded nickel-chromium catalyst. Comprising the following raw materials in parts by weight: 10.2 to 15.4 parts of aluminum oxide, 0.5 to 3 parts of polyethylene glycol, 5.7 to 8.5 parts of nickel nitrate, 4.1 to 6.2 parts of chromic nitrate, 0.3 to 0.45 part of hexadecyl trimethyl ammonium bromide, 1 to 1.5 parts of tetrabutyl titanate, 0.2 to 0.3 part of sodium tripolyphosphate, 5 to 6.5 parts of absolute ethyl alcohol and 1 to 3 parts of glacial acetic acid. By applying the catalyst provided by the invention, the content of p-menthane can be remarkably increased.

The invention discloses a wide-optical-band-gap transparent conductive copper chromate epitaxial thin film and a preparation method thereof.The preparation method of the thin film comprises the following steps that according to the stoichiometric ratio, copper nitrate and chromic nitrate are added into a mixed solvent of ethylene glycol and glacial acetic acid, and precursor colloid is obtained; al2O3 is used as a growth substrate, after cleaning, the precursor colloid forms a film on the surface of the growth substrate through a spin-coating method, and then an amorphous film is obtained through pyrolysis; and carrying out post-annealing treatment on the amorphous film in a reducing atmosphere to obtain the wide-optical-band-gap transparent conductive copper chromate (CuCrO2) epitaxial film. The wafer-level transparent conductive CuCrO2 epitaxial film with excellent performance is prepared in a non-vacuum environment, the operation process is simple, the requirement for expensive equipment is low, mass production is facilitated, and the method has good application prospects in the field of photoelectric devices.

The present invention discloses a surface treatment method for an aluminum foil current collector and a battery electrode. The surface treatment method comprises the following steps: S1, preparing a first treatment liquid of phosphoric acid or nitric acid with a mass concentration of 1 to 10%, immersing the aluminum foil in the first treatment liquid, and ultrasonically cleaning the aluminum foil for 0.1 to 10 minutes; S2, adding a chromium-containing compound, a polyacrylic resin, and a fluoride to deionized water to prepare a second treatment liquid, wherein the chromium-containing compound is chromium phosphate or chromium nitrate, and the fluoride is one or more of chromium fluoride, magnesium fluoride, ammonium fluoride, and hydrofluoric acid; rolling the second treatment liquid onto the surface of the aluminum foil obtained in step S1, and drying the liquid to obtain the aluminum foil current collector. The first and second treatment liquids of the present invention have simple formulations and a simple process. The prepared aluminum foil can achieve a dyne value of 55 or above, significantly improves corrosion resistance in electrolyte, and enhances adhesion to the carbon coating layer.

The invention discloses a surface confinement long afterglow luminescent probe, and a preparation method and application thereof, and the preparation method comprises the following preparation steps: mixing zinc nitrate, gallium nitrate and sodium germanate, dissolving in deionized water, stirring, reacting, centrifugally washing, and collecting a product; dissolving the product, zinc nitrate, sodium germanate, gallium nitrate and chromic nitrate in deionized water; reacting to obtain a reaction product; performing centrifugal washing, and collecting a product; dispersing the product into dimethylformamide, dropwise adding 3-aminopropyltriethoxysilane, and condensing and refluxing to obtain a product; dispersing the product into dimethylformamide, adding succinic anhydride and 4-dimethylaminopyridine, and stirring for reaction to obtain a reaction product; adding the reaction product into 1-ethyl-(3-dimethylaminopropyl) carbodiimide and N-hydroxysuccinimide, carrying out stirring reaction, centrifuging the solution, and dispersing the solution into PBS (Phosphate Buffer Solution); adding BHQ-3-NH2 into the solution, reacting, and centrifuging to obtain a probe; the probe provided by the invention has better FRET efficiency.

The application discloses a camouflage coating simulating spectral reflection characteristics of green vegetation and a preparation method thereof. The camouflage coating is prepared by adopting a solution casting method after a mixed solution is configured according to a mass ratio of 1:(0.5-2):(0.01-0.1) of chromium modified molecular sieve, a film forming agent and a defoaming agent. The chromium modified molecular sieve is obtained by ion exchange of X-type molecular sieve and a chromium nitrate solution. The spectral similarity of the camouflage coating prepared by the application to green vegetation can reach 0.947, and the camouflage coating has similar spectral reflection characteristics of green vegetation leaves. Meanwhile, the camouflage coating overcomes the defects of traditional camouflage, such as not having a "water absorption valley" spectral characteristic in a near-infrared spectral band.

The present invention discloses a passivating agent, a passivating solution, a preparation method, and applications thereof. The passivating agent comprises 3-10 parts chromium nitrate; 1-5 parts ammonium fluoride; 3-8 parts cobalt nitrate; 2-5 parts sodium nitrate; 0.5-2 parts malonic acid; and 1-5 parts acetic acid. The passivating agent does not contain a surfactant. The passivating agent has a low concentration, mild operating conditions, a short passivation time, and can effectively improve the adhesiveness of the zinc-plated surface of NdFeB.

The invention relates to the field of metal surface treatment, and particularly discloses a gray passivation solution for zinc alloy and a passivation method. The gray passivation solution for the zinc alloy comprises the following components: 60-85 g / L of nickel chloride hexahydrate, 60-75 g / L of sodium thiocyanate, 5-10 g / L of ammonium chloride, 20-30 g / L of chromic nitrate nonahydrate, 10-15 g / L of cobalt chloride hexahydrate, 15-20 g / L of monopotassium phosphate, 40-60 g / L of zinc dihydrogen phosphate, 80-110 mL / L of a zinc nitrate solution, 20-30 g / L of manganese dihydrogen phosphate and 0.05-0.2 g / L of a surfactant, and a solvent of the gray passivation solution for the zinc alloy is pure water. The content of zinc nitrate in the zinc nitrate solution is 300g / L. The gray passivation solution for the zinc alloy has the advantages of being uniform in coating film surface, high in binding force and resistant to abrasion and corrosion.

The invention discloses a composite solid electrolyte taking chromium carbide as a filler and a preparation method thereof, and the method comprises the following steps: adding glucose into a chromic nitrate solution, uniformly stirring and mixing, and drying to obtain a mixture A; mixing the mixture A with carbon black, grinding, adding isopropanol, carrying out ball milling, and drying to obtain a mixture B; under the nitrogen atmosphere, the mixture B is subjected to carbonization treatment, and chromium carbide is prepared; the preparation method comprises the following steps: blending chromium carbide and polyethylene oxide, adding the mixture into N, N '-dimethylformamide, heating and stirring, then adding succinonitrile and lithium bis (trifluoromethanesulfonimide), continuously heating and stirring to completely dissolve the mixture, uniformly mixing, and drying to obtain the composite solid electrolyte taking chromium carbide as the filler. The prepared composite solid electrolyte has excellent ionic conductivity, a stable interface and a wide electrochemical window, and high stability and cycle performance of a lithium metal battery are achieved.

The application discloses a kind of near-infrared long afterglow luminescent nano probes, its preparation method and application, belong to near-infrared long afterglow material field. With mesoporous silica as template, with zinc acetate, gallium nitrate, tin chloride, chromium acetate, chromium nitrate and yttrium nitrate as doped metal raw materials, long afterglow luminescent core is obtained by reaction and calcination;The outer layer of long afterglow luminescent core is coated with manganese dioxide, to obtain pre-product;Pre-product is surface modified, and coupling target molecule plerixafor, i.e. near-infrared long afterglow luminescent nano probe. The near-infrared long afterglow luminescent nano probe has good biological safety, can be effectively enriched in the tumor area in vivo after mouse tail vein injection, can realize high-sensitivity imaging of multiple small tumors in vivo under red light LED irradiation, and the imaging time is short, suitable for intraoperative imaging, can be used for the imaging of breast cancer tumor model to guide tumor resection.

The invention discloses a method for preparing a copper chromite black pigment by recycling organic silicon waste contact bodies in organic silicon production. The method specifically comprises the following steps: adding water into the organic silicon waste contact bodies to be treated in the organic silicon production, stirring and leaching, and then carrying out filter pressing to obtain filtrate a and filter residues b; grinding the filter residue b, adding concentrated sulfuric acid, and carrying out acid leaching to obtain an acid-leached material c; the acid leaching material c is merged into the filtrate a for water leaching, then filter pressing is conducted, filtrate d and filter residues e are obtained, the filter residues e are silicon powder, and the silicon powder enters an organic silicon production system; adding a P204 extracting agent into the filtrate d, and extracting to obtain a P204 extracting solution f and an extracted solution g; sulfuric acid is added into the P204 extraction liquid for reverse extraction, and reverse extraction liquid h and raffinate i are obtained; after the strip liquor h is subjected to oil removal, chromic nitrate, stearic acid and PEG200 are sequentially added and mixed for a reaction, and reaction liquor j is obtained; and evaporating, drying, crushing, calcining and grinding the reaction liquid j to obtain the copper chromite black pigment.

The invention discloses a soil remediation agent for acid soil and a preparation method of the soil remediation agent, and relates to the field of soil remediation. When the soil remediation agent for the acid soil is prepared, 1-amino-1H-imidazole-4, 5-dicarboxylic acid diethyl ester and hydrazine hydrate are subjected to a reaction, and a polymeric monomer is prepared; uniformly mixing calcite powder, a polymeric monomer and benzoquinoline-4, 7-dicarboxaldehyde, so as to obtain modified calcite; the preparation method comprises the following steps: uniformly mixing biochar, 2-(bromomethyl) terephthalic acid and chromic nitrate nonahydrate to prepare modified biochar; the preparation method comprises the following steps: uniformly mixing ferric oxide powder, vinyl trimethoxy alkane, sodium alginate and calcium chloride, and oxidizing with m-chloroperoxybenzoic acid to obtain modified ferric oxide; uniformly mixing the modified calcite and the modified biochar with the modified ferric oxide to obtain the soil remediation agent for the acid soil. The soil remediation agent for acid soil prepared by the invention has excellent heavy metal complexing property, water retention property, carbon sequestration property and acid-base lasting adjustability.

An insulating coating composition for an electrical steel sheet, according to an embodiment of the present invention, comprises: 100 parts by weight of a metal phosphate; 30 to 350 parts by weight of silica; 30 to 350 parts by weight of chromium nitrate; 30 to 350 parts by weight of at least one shielding agent among dolomite, talc, carbonate, and feldspar; and 1 to 100 parts by weight of a carbon structure.