1172 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 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 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 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 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 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 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 method for efficiently leaching waste battery positive electrode powder by using hydrogel to assist bacteria, belonging to the field of resource recovery technology. The invention utilizes hydrogel to assist bacteria to leach valuable metal elements from waste LIBs. The bacteria include L. plants and / or L. acidophilus , the hydrogel is prepared by polyvinyl alcohol and agarose. The present invention creatively applies hydrogel in the bioleaching process, effectively increases the leaching percentage of valuable metals in waste LIBs, and avoids the use of inorganic acid at the same time. Compared with the traditional chemical leaching technology, the method of the present invention has obvious advantages in operational safety and effectively avoids the risk of secondary pollution to the environment. By using microorganisms, not only the efficient recovery of metal resources in the battery is achieved, but also the environmental friendliness of the whole process is ensured.

The invention relates to the technical field of etching liquid, in particular to a copper metal etching liquid composition. Comprising the following components in percentage by weight: 5-10% of hydrogen peroxide, 0.1-0.3% of a first fluorine source, 1-5% of first inorganic acid, 1-5% of alkali, 0.01-0.8% of a first metal corrosion inhibitor and the balance of deionized water; and the auxiliary agent comprises 2-8% of a second fluorine source, 10-55% of second inorganic acid, 0.1-2% of a second metal corrosion inhibitor and the balance of deionized water. The etching liquid is excellent in etching effect, CD-loss reaches 0.6-0.8 [mu] m, the slope angle reaches 40-50 degrees, the highest copper load reaches 20000 ppm, and meanwhile the problem that when copper is high, due to the fact that the nitric acid concentration is too high, metal etching is abnormal is solved.

The invention relates to the technical field of inorganic compound preparation, and particularly discloses a method for preparing high-purity iron phosphate through low-temperature acidolysis of phosphated residues, which comprises the following steps: washing, drying and crushing the phosphated residues to obtain phosphated residue powder; carrying out low-temperature acidolysis reaction on the phosphated residue powder and inorganic acid in an aqueous medium at 60-90 DEG C to obtain an acidolysis solution; adding an oxidizing agent into the acidolysis solution, adjusting the pH value of the system to 2.5-4.5 at 65-85 DEG C, carrying out oxidation impurity removal, and filtering to obtain an iron-containing phosphate solution; and selectively supplementing an iron source according to the molar ratio of iron to phosphorus in the solution, adjusting the pH value to 1.0-3.0, and carrying out precipitation reaction at 65-75 DEG C to generate iron phosphate. According to the method, low-energy-consumption resource utilization of the phosphated residues is achieved by combining low-temperature acidolysis with oxidation impurity removal and component regulation and control, the product purity meets the battery-grade requirement, and the method is suitable for preparing the lithium battery positive electrode material precursor.

A brazing-sheet manufacturing method includes superposing a core-material slab on or adjacent to at least one surface of a filler-material slab to form a clad slab, the core-material slab being composed of an aluminum material and the filler-material slab being composed of an Al—Si—Mg series alloy. Then, the clad slab is hot rolled to form a clad sheet having a core material layer composed of the aluminum material of the core-material slab and a filler material layer composed of the Al—Si—Mg series alloy of the filler-material slab. Then, the clad sheet is subjected to one or more passes of cold rolling. Either between cold-rolling passes or after the completion of the cold rolling, a surface of the clad sheet is etched using a liquid etchant that includes one or more inorganic acids. The liquid etchant does not contain fluorine atoms.

The invention discloses a solar cell and a preparation method thereof, electric equipment and power generation equipment, the solar cell comprises a passivation material, and the passivation material comprises cations and anions; the cations comprise ammonium ions, and the anions comprise acid radical ions; the ammonium ions comprise substituted or unsubstituted alkyl ammonium ions, and the acid radical ions comprise any one of organic acid radical ions and inorganic acid radical ions. The positive ions in the passivation material can enter perovskite crystal lattices to form two-dimensional perovskite to play a role in protecting a light absorption layer, and the electron cloud density on the negative ions is relatively high and can act with excessive lead iodide in the perovskite to stabilize a lead-iodine octahedral framework, so that the passivation material can passivate the defects of a perovskite layer, and the light absorption performance of the light absorption layer is improved. And the photoelectric conversion efficiency and the stability of the solar cell device are improved.

The invention belongs to the technical field of battery materials, and discloses iron phosphate with high specific surface area, a preparation method thereof, lithium iron phosphate and a battery. The specific surface area of the iron phosphate is larger than 8.5 m < 2 > / g, and the particle size of primary particles is 50-150 nm. The preparation method comprises the following steps: preparing amorphous iron phosphate; the method comprises the following steps: firstly adding inorganic acid into slurry prepared by re-pulping amorphous iron phosphate and water for pre-crystallization, and then adding ammonium salt for crystallization; and carrying out solid-liquid separation treatment on the crystallized slurry, and washing, drying and dehydrating the obtained solid phase to obtain the iron phosphate with high specific surface area. The iron phosphate provided by the invention has the advantages of high specific surface area, favorable crystallinity and stable crystal form, and can ensure the stability of the lithium iron phosphate structure obtained by subsequent production. The iron phosphate can be further prepared into lithium iron phosphate, and the electrical property of the battery can be improved when the lithium iron phosphate is applied to the battery.

To provide an acidic disinfectant composition and a cleaning sheet that give no influence to a material of a disinfected surface, cause no reduction of active ingredients, and have excellent disinfecting efficacy.SOLUTION: The present invention provides an acidic disinfectant composition that contains: persulfuric acid or a persulfate salt as a component (A); an acid agent including at least one selected from the group consisting of inorganic acid, organic sulfonic acid, and organic phosphonic acid as a component (B); a surfactant as a component (C); and water as a component (D), as well as a cleaning sheet comprising a base material sheet impregnated with the acidic disinfectant composition.SELECTED DRAWING: None

The invention discloses a method for catalyzing and photo-initiating nitro reduction through ferric trichloride, and belongs to the field of pharmaceutical compound synthesis. According to the method, transition metal salt is mainly used as a catalyst for reaction, inorganic acid and organic acid are used as additives, nitryl is reduced into amino under the condition of air or nitrogen, the catalytic efficiency is high, the yield of reduction products is high, the production cost is greatly reduced, and the method is suitable for synthesis and amplification of later compounds and has good application prospects. The method has the advantages of no expensive metal catalyst or reducing agent, simple preparation process, high efficiency, environmental protection, safety and cost saving.

The invention discloses a deoxidation composition and a preparation method thereof, and relates to the technical field of deoxidation process, the deoxidation composition comprises 1-15% of inorganic acid, 1-5% of organic acid, 5-25% of peroxide, 0.1-3% of complexing agent, 0.01-5% of surfactant and 40-80% of water. According to the deoxidation composition provided by the invention, the complexing agent and the surface complexing agent are added, so that a deoxidation solution has a good etching rate, relatively high copper solubility, excellent copper surface roughness, excellent plating discoloration resistance and high working efficiency, and can be produced and used on a large scale.

The invention relates to the technical field of etching liquid, in particular to a double-dosage-form etching liquid composition. Comprising a main agent and an auxiliary agent, and the main agent comprises the following components in percentage by weight: 8-20% of hydrogen peroxide, 1-10% of a first etching agent, 1-10% of a first inhibitor, 0.1-5% of a first stabilizer and the balance of deionized water; the auxiliary agent comprises 5-30% of a second etching agent, 0.1-5% of a second inhibitor, 1-10% of a chelating agent, 10-40% of a second stabilizer and the balance of deionized water; the first etching agent comprises organic acid and inorganic acid, and the organic acid comprises succinic acid. The etching solution disclosed by the invention shows excellent etching performance, and has good compatibility performance for three-layer film (MTD / Cu / MoNb) and two-layer film (Cu / MoNb) and for different copper thicknesses (3500 / 6000 / 8000).

Disclosed in the present disclosure is a method for selectively leaching scandium from red mud. The red mud contains scandium, and the method comprises: using an inorganic acid solution to pretreat red mud to obtain pretreated red mud slurry; and using a leaching agent to carry out selective leaching on the pretreated red mud slurry to obtain leached slurry, the leaching agent containing organic acid and metal inorganic salt, and the mass ratio of the organic acid to the metal inorganic salt being 0.00015-0.0500.

The invention relates to the technical field of modified biochar, in particular to wood vinegar modified biochar, a saline-alkali soil modifier containing the wood vinegar modified biochar and a preparation method of the wood vinegar modified biochar. The invention provides a preparation method of wood vinegar modified biochar, which comprises the following steps: cleaning and drying biochar, adding the biochar into wood vinegar, stirring at room temperature for 0.5-1 hour, adding a potassium permanganate solution, continuously stirring for 2.5-4 hours, carrying out solid-liquid separation, and collecting solids to obtain the wood vinegar modified biochar. The invention further provides the wood vinegar modified biochar, a saline-alkali soil modifier containing the wood vinegar modified biochar and a preparation method of the wood vinegar modified biochar. The saline-alkali soil improver has excellent sodium ion adsorption capacity and plant growth promoting capacity, inorganic acid, organic acid or various microbial strains do not need to be used in the preparation process, the preparation method is simple and feasible, and the saline-alkali soil improver can be widely applied to development and utilization of saline-alkali soil.