1113 results about "Sodium Bicarbonate Solution" patented technology

The invention discloses a process of preparing Dehydroandrographolide Succinate Sodium and Potassium salts with Potassium Dehydroandrograpolide Succinate. The process comprises the steps of: weighing right amount of Potassium Dehydroandrograpolide Succinate, adding absolute ethyl alcohol about 3 to 6 times to make suspension; weighting mole Sodium bicarbonate in equal weight, adding water to dissolve, dripping slowly Sodium bicarbonate solution in potassium dehydroandrograpolide succinate suspension in a water bath at a temperature of between 40 and 60 DEG C, mixing into liquid medicine and defecating, dissolving impurity and filtering, putting on a 0.22 mu m filter membrane, adding absolute ethyl alcohol about 7 to 12 times while mixing, after 10 to 30 minutes of mixing, natural crystallization seeds out after 13 to 18 hours standing in room temperature; filtering and washing 2 to 3 times with right amount of absolute ethyl alcohol; filtering and drying with less pressure. The invention provides a process route of preparing potassium sodium dehydroandroan drographolide succinate for injection with high purity, which is high in process yields, high in product purity, good in solubility, less in impurity and complete in combination of Potassium and Sodium; no obvious toxic and side effect in clinic application, the preparation is more stable compared with the similar and can be prepared into various preparations.

The invention discloses a disinfectant used in the breeding industry. The disinfectant comprises the components in percent by volume: 20-30mL of a sodium hydroxide solution with the mass percent of 30-45 percent, 3-7mL of peroxyacetic acid, 5-9mL of chloramine, 12-17mL of a sodium bicarbonate solution with the mass percent of 20-45 percent, 4-12mL of absolute ethyl alcohol and 12-19mL of a saponated cresol solution. All components are stirred for a certain time at a normal temperature and a normal pressure, and sub-packaged and plastic-packaged to obtain the disinfectant. By adopting the mode, according to the disinfectant used in the breeding industry, disclosed by the invention, the components adopted by the disinfectant are low in price, so that the total cost of the disinfectant is reduced, the disinfection effect is good, a good medication effect can be achieved by only consuming less disinfectant, the medication efficiency is high, toxic and hazardous effects on bred livestock and fishes are avoided, and no toxin accumulation is caused.

The invention provides a fabric post-finishing agent based on a modified silk fibroin solution and a preparation method of the fabric post-finishing agent. The preparation method comprises the following specific operational steps: (1) removing impurities from waste silk, putting the impurity-free waste silk in a sodium bicarbonate solution for boiling and degumming, taking out and wringing out the degummed waste silk, washing with clean water till the greasy feel is eliminated, putting the primarily treated waste silk in the sodium bicarbonate solution again for boiling and degumming, taking out and wringing out the degummed waste silk again, washing again with clean water till the greasy feel is eliminated, putting the secondarily treated waste silk in an oven for drying, so as to obtain degummed silk; (2) putting the degummed silk in a lithium bromide solution for standing and dissolution, taking out the treated silk, and performing cooling, dialysis and concentration to obtain a silk fibroin solution; and (3) adding glycerin and gelatin into the silk fibroin solution, uniformly stirring to form a membrane solution, adjusting the pH value of the membrane solution and then adding glutaraldehyde and chitosan, uniformly stirring, and finally mixing the treated membrane solution with a solvent containing additives, so as to obtain the fabric post-finishing agent. The fabric post-finishing agent obtained according to the preparation method covers the fabric surface in the form of a composite membrane; and the preparation method is beneficial to improvements in the membrane forming property, the ductility and the like of a silk fibroin finishing agent.

The invention provides a reactive dye ecological dyeing method of silk fabrics, which comprises the following steps of: (1) even dyeing: using reactive dye and decamethyl cyclopenta siloxane (D5) according to the mass ratio of 1:10 to 50 to prepare a reactive dye / D5 suspending dispersed liquid; padding the silk fabrics in 30 to 90 g / l of sodium bicarbonate solution; and dyeing the silk fabrics in the reactive dye / D5 suspending dispersed liquid with the rolling liquid rate of 160 to 200% at room temperature for 25 to 35 minutes, wherein the rolling liquid rate is used for ensuring even dyeing of the silk fabrics; and (2) color fixing: heating a mixture system obtained from the step (1) to 40 to 50 DEG C, and keeping the temperature for 20 to 30 minutes; then heating to 70 to 90 DEG C, and keeping the temperature for 20 to 30 minutes; and taking the silk fabrics out, and performing soap boiling. In the process of dyeing provided by the invention, an electrolyte is not added for dyeing acceleration, the dyeing rate of the dye is close to 100%, the fixing rate is higher than that of traditional bath dyeing, and the fastness of the fabrics is good after dyeing. Because the electrolyte is not needed for dyeing acceleration, the burden of treating dyeing waste water is effectively reduced, and the ecological environment is protected.

The invention provides a preparation method of an organic chelate fertilizer. The preparation method comprises the steps that (1) typha angustifolia and crop straw are cleaned, crushed and mixed; compound bacterium liquid and a sodium bicarbonate solution are added; stirring and sealing fermentation are conducted; a potassium hydroxide solution is added; humic liquid is obtained; (2) compound amino acid and inorganic salt of medium trace elements conduct chelation reaction with the humic liquid; a pH value is adjusted by an acid solution to be 5-6; temperature rise and stirring are conducted for reaction; the pH value is adjusted by an alkaline substance to be 7; a chelation product solution is obtained; (3) a nitrogenous fertilizer, a phosphate fertilizer, a potash fertilizer and water are added to a mixer by weight percentage, and mixed uniformly; pelleting slurry is prepared; and (4) the chelation product solution and the pelleting slurry are driven into a guniting neutralization geosyncline, mixed uniformly, transferred to a pelletizer for guniting and pelleting, and dried, and then the organic chelate fertilizer is obtained. The organic chelate fertilizer prepared by the method is small in application amount, high in stability, and high in plant absorptivity.

The invention discloses a method for preparing sodium metavanadate / potassium metavanadate, which comprises the following steps: heating sodium modified vanadium extraction leach liquor to 80-90 DEG C, adding calcium chloride saturated solution into the sodium modified vanadium extraction leach liquor with the mass ratio of Ca: V= 1.5: 2, stirring the mixture uniformly while the temperature of 80-90 DEG C is kept, and filtering the mixture after reaction for 30-40 minutes to obtain vanadic acid solid; washing and filtering the obtained vanadic acid solid; putting the washed vanadic acid solid in a container, adding sodium bicarbonate solution or potassium bicarbonate solution with the mass concentration of 20-30% by a molar ratio of CO3<2-> to Ca<2+> in the range of 1 to 1.2 into the container, fully stirring the mixture at temperature of 60-70 DEG C, , filtering the mixture after reaction for 30-40 minutes to obtain calcium carbonate solid and sodium metavanadate or potassium metavanadate solution, evaporating, concentrating, crystallizing, and finally, separating the obtained crystal and dring at a temperature below 40 DEG C to obtain the sodium metavanadate or potassium metavanadate solid.

The present invention relates to a nano alumina material, and its production method includes the following steps: using sodium aluminate and sodium hydrogen carbonate solutions to make them directly implement reaction, then filtering, dispersing, washing and adding acid to make beat-dispersion and ageing to obtain the transparent sol for preparing nano alumina material, and using said sol to directly produce nano alumina powder or nano alumina ceramic filter membrane.

The invention discloses a preparation method of a compound-type starch modification super absorbent resin. The preparation method comprises the following steps of: adding deionized water to corn starch, stirring, slowly heating to 70 DEG C, and after completely dextrinizing the starch, reducing pasting liquid to a room temperature for standby application; weighting a right amount of acrylic acid solution under the action of ice water cooling, neutralizing by a 25% sodium hydroxide solution, adding 15% sodium bicarbonate as a pH buffering agent, and obtaining a monomer solution; after uniformly mixing the monomer solution and the pasting liquid in the presence of nitrogen, adding ammonium persulfate, and slowly heating to 58 DEG C to 62 DEG C; adding a sodium alginate saturated solution, dropwise adding a cross-linking agent, and reacting for 2-2.5 hours; after reaction is ended, stopping the feeding of nitrogen, drying copolymers to constant weight at 75-80 DEG C, smashing, screening by a 60-80 screen and obtaining the compound-type starch modification super absorbent resin. The environment-friendly water-absorbent resin with high salt tolerance and high water retention rate is prepared by starch graft copolymerization and alginate crosslinking.

The invention belongs to the technical field of new energy resources and discloses a preparation method of a special solid base catalyst for biodiesel preparation. The method includes: taking sodium dodecyl benzene sulfonate as a surfactant to obtain saturated sodium bicarbonate solution at a high temperature, performing polymerization reaction in a same vessel to obtain polystyrene emulsion, adopting emulsion microspheres for adsorbing the saturated sodium bicarbonate solution, then dropwise adding tetraethyl orthosilicate to realize hydrolysis and coating of surfaces of the emulsion microspheres, decomposing potassium bicarbonate at a lower temperature to generate gas and form a porous structure, and calcining at a higher temperature to remove an polystyrene inner core, so that the special solid base catalyst for biodiesel preparation is obtained. By adoption of the polymer emulsion for adsorption of sodium bicarbonate to form the spongy porous solid base catalyst through two-step calcination, a carrier and an effective component are both in porous structures, and the problem that catalysts prepared according to a traditional impregnation method are prone to causing pore passage blockage and influences on catalysis efficiency is effectively solved.

The invention relates to a method of preparing light ceramisite by use of muck. The method comprises the following steps: 1) uniformly mixing raw muck with carbonized rice hull ash and fly ash to obtain a batch; 2) putting the batch into a disc granulator and granulating into balls, atomizing and spraying in 3-6% sodium bicarbonate solution (by mass) accounting for 10-20% of the batch mass, and preparing 5-20mm spherical pellets by a stirring-rolling-granulating method; 3) putting the pellets into a container and sintering in a heating cavity of a microwave sintering furnace, wherein the sintering conditions are that the microwave frequency is 2.45GHz, the microwave sintering temperature is 800-1,200 DEG C, and the heat preserving time is 10-30 minutes; 4) naturally cooling the sintered material in the microwave sintering furnace to room temperature to obtain high-quality light muck ceramisite. The method provided by the invention effectively utilizes the industrial and agricultural solid wastes to improve the ceramisite performance, also solves the problems such as high energy consumption, severe pollution and low capacity in existing ceramisite sintering process and can be used for preparing high-quality light muck ceramisite.

The invention dislcoses a coating preservation method of pseudosciaena crocea. The method includes following steps: (1) pre-treatment; (2) a soaking process; (3) a film-forming process; and (4) a packaging and refrigerating process. In the method, a sodium bicarbonate solution with a mass percentage concentration being 0.5-1% is employed for washing the pseudosciaena crocea, a composite film-forming preservative agent is developed on the basis of biochemical characteristics of the pseudosciaena crocea and an air-drying film-forming operation is carried out through cold air. The coating preservation method in operation process, is less in equipment investment, is environmentally-protective and safe, is suitable for industrialized production and can greatly prolong a preserving time of the pseudosciaena crocea on the premise of ensuring an edible quality and a sensory quality of the pseudosciaena crocea. The method is significant in preserving effect and is high in film-forming efficiency.

The invention relates to a method for precipitating rare earth carbonate, belonging to the field of production technology of rare earth carbonate. The method comprises the following steps of: adding sodium carbonate into rare earth liquid; precipitating the rare earth metal ions until the concentration of the rare earth metal ions in the supernate is 0.2-0.002mol / L; continuously precipitating by taking a sodium bicarbonate solution as a precipitator until the pH value of the supernate is 6-7; and dehydrating the precipitate, and washing to obtain the rare earth carbonate. In the rare earth precipitation process, the rare earth carbonate with low content of calcium oxide and calcium oxide is obtained by combining sodium carbonate and sodium bicarbonate as a precipitator; and after thorough precipitation, the concentration of rare earth ions in the mother liquid is less than 0.0001mol / L.

A method for producing precipitate silicon dioxide by using sodium bicarbonate to control a supersaturation degree comprises the steps of taking quartz sand and soda as raw materials, roasting, dissolving a sodium carbonate solution to prepare a sodium silicate solution, allowing the sodium silicate solution to react with a sodium bicarbonate solution, separating out a hydrated silicon dioxide precipitate by a method for controlling the reaction crystallization supersaturation degree, washing and drying the filtered precipitate, and finally obtaining precipitate silicon dioxide, namely white carbon black. Filtered filtrate is the sodium carbonate solution which is recycled for absorbing carbon dioxide from a roasting working section to prepare a concentrated sodium bicarbonate solution required for crystallization reaction, dissolving solid sodium silicate, and returning to the quartz sand roasting working section after evaporation and concentration. Precipitate silicon dioxide prepared by the method is high in purity and uniform in particle size distribution; materials are recycled during the whole production flow; and the problem of sodium sulfate sewage discharge in conventional production is solved.

The invention discloses a modified hydrogel material used for 3D printing and application of the same to drug loading, belonging to the technical field of 3D printing materials. The modified hydrogel material is prepared through the following steps: adding a hydrogel material, acryloyl chloride and triethylamine into a solvent, carrying out a reaction in an ice bath for 12 h and then carrying out a reaction at normal temperature for 12 h; and washing a reaction product with a saturated sodium bicarbonate solution and then carrying out rotary evaporation so as to obtain the modified hydrogel material. The modified hydrogel is of a long-chain structure and has an active chemical group at its tail end; and as a photopolymerization initiator is added into the aqueous solution of the modified hydrogel, a crosslinking reaction occurs under the illumination of light with a wavelength of 365 nm, so rapid shaping of the material is realized. The modified hydrogel material prepared by using 3D printing technology and used for drug loading can be subjected to injection and printing at normal temperature without extra high-temperature apparatuses, low-temperature apparatuses or the like; and the material is easy to shape, fast in gelating speed, excellent in mechanical properties and beneficial for loading and effective release of different medicine molecules.

The invention provides recombinant collagen and thermo-sensitive hydrogel of the recombinant collagen. The invention further provides a preparation method of the thermo-sensitive hydrogel, comprisingthe following step: standing chitosan, collagen, carbodiimide, N-hydroxysuccinimide, beta-sodium glycerophosphate and a sodium bicarbonate solution at the temperature of 37 DEG C.

A method for measuring COD and total organic carbon by utilizing flow injection mode includes obtaining ozone with known concentration, carrying out oxidation reaction by mixing ozone solution with water sample then mixing obtained mixture with sodium acid carbonate solution and luminal solution as well as cobalt ion solution, using photoelectric multiplier tube to detect generated chemical luminous signal and calculating out COD and total organic carbon of water sample.

The invention belongs to the field of fire prevention or inhibition, and particularly discloses a fireproof door which comprises a door frame, rolling door bodies matched with the door frame, and rotary shafts rotatably connected to the top of the door frame. The rolling door bodies are mounted on the rotary shafts. The fireproof door further a protective cover, a mounting rack, plastic bags, a telescopic plate, an electromagnet and a balance weight plate. The protective cover is arranged outside the rotary shafts in a covering mode. The mounting rack is fixed into the protective cover. The balance weight plate is fixed to the free ends of the rolling door bodies. The telescopic plate is connected between the protective cover and the balance weight plate. Reaction cavities are formed by the balance weight plate, the telescopic plate and the rolling door bodies. The two ends of the plastic bags are separately fixed to the protective cover and the balance weight plate. The rolling door bodies are provided with extinguishing ports. The electromagnet is fixed to the protective cover. The balance weight plate is an iron balance weight plate, and the balance weight plate and the electromagnet attract each other. The plastic bags are internally provided with a sodium bicarbonate solution. The reaction cavities are internally provided with an aluminum sulfate solution. By adoption of the scheme, the door can be automatically closed when a fire occurs, and operation is convenient.

The invention discloses a board softening and mould proofing method. Softening and mould proofing are carried out at the same time, the treatment period is short, the method is simple, the working efficiency is improved by 15.3%, batch treatment can be carried out, softening and mould proofing are carried out through three steps, the effect is durable, traces are not left, and the cost is saved by 14.2%. A board is soaked with fermentation liquor, generated micromolecule matter can change the organization structure, fibers are initially softened, restraining on growth of infectious microbes is achieved, and deep pigments are dissolved; the board is soaked with a Chinese drug solution, rapid permeability is achieved, outside-to-inside even antibiosis is achieved, the using amount is small, antibacterial treatment can be carried out after diluting with water, safety and high efficiency are achieved, the cost is low, and the effect is durable; the board is subject to ultrasonic soaking with a sodium bicarbonate solution, antibiosis and disinfection are carried out, blots are removed, mould proofing and moth proofing are carried out, and the fibers are softened; and the board is dried in a low-temperature and low-humidity room, so that the pliability of the board is kept, preparation is facilitated, the fracture rate is reduced by 6%, the color and luster of the board can be kept natural, even and new, and color and luster treatment in the later period is facilitated.

The invention discloses an attapulgite and biomass compound biological ceramsite. The biological ceramsite contains solid powder and a liquid adhesive, wherein the solid powder contains the following components in percentage by mass: 50-90% of attapulgite powder, 5-30% of a biomass material, and 10-40% of an accessory, wherein the accessory is first-level fly ash, the liquid adhesive is a sodium bicarbonate solution or an ammonium chloride solution, the amount of the used liquid adhesive accounts for 15-35% of the mass of all the solid powder, and the concentration range of the liquid adhesive is not more than 2%. The attapulgite and biomass compound biological ceramsite prepared according to the invention uses the fly ash and the sodium bicarbonate solution to replace conventional adhesive, plasticizer and fluxing agent, so that the raw material cost is saved, the strength and porosity of the ceramsite are improved, and the ceramsite has the advantages of high porosity, large specific surface area, high strength, strong water resistance and the like. The ceramsite disclosed by the invention can be used as a filler for an adsorbing material, a biological filter and a denitrification filter.

The invention provides a preparation method of high-purity butylphthalide. The preparation method comprises the following steps: A. adding a crude product of rac-3-n-butylphthalide to a reaction flask and reducing the pressure until the system vacuum degree is 1-2mbar; raising the temperature and collecting a 130-140 DEG C fraction, thus obtaining a rac-3-n-butylphthalide fraction; B. adding the rac-3-n-butylphthalide fraction and methanol to the reaction flask, stirring to dissolve the materials, adding a methanol solution of inorganic base, heating till reflux reaction, carrying out filtration, removing methanol through concentration, adding dichloromethane, stirring the materials to precipitate solids, and carrying out filtration and drying, thus obtaining 1-hydroxypentyl-2-benzoate; and C. adding 1-hydroxypentyl-2-benzoate to water, stirring to dissolve 1-hydroxypentyl-2-benzoate, then adding the solution to a reaction flask with a hydrochloric acid solution, stirring to react at a temperature of 35-45 DEG C, standing for layering, washing an oil phase with a sodium bicarbonate solution and water in sequence, and carrying out drying and filtration, thus obtaining the pure product of rac-3-n-butylphthalide.

The invention belongs to the technical field of medicines and particularly relates to a preparation method of cefditoren pivoxil. The preparation method particularly includes following steps: (1) carrying out a reaction between cefditoren mother nucleus 7ATCA and AE-activated ester with dichloromethane as a solvent under an alkaline condition at 0-5 DEG C; (2) performing extraction with pure water and adding a sodium iso-octoate / acetone solution to obtain cefditoren sodium; (3) carrying out a reaction between the cefditoren sodium and iodomethyl pivalate under the alkaline condition at -40 DEG C to obtain a cefditoren pivoxil solution; (4) adding pure water to separate out a crystal to obtain a crude product of the cefditoren pivoxil. The technical scheme also comprises steps of dissolving the crude product of the cefditoren pivoxil in a mixed solution including dichloromethane and anhydrous ethanol, washing the material solution with a 1% sodium bicarbonate solution and pure water, collecting an organic phase, and performing a pressure-reducing evaporate-drying process to obtain the cefditoren pivoxil being higher than 99% in purity and less in impurities. The preparation method is simple in operation, is easy to control, is high in yield, allows the raw material to be obtained easily and is suitable for industrialized large-scale production.

The natural fruit and vegetable preservative is prepared through mixing lilac flower extract and adsorbent, which is bentonite and active carbon. The lilac flower extract is prepared with lilac flower and through crushing, water soaking, distilling to obtain distillate, the first extraction of the distillate with solvent, the second extraction of the supernatant with sodium bicarbonate, the third extraction of the second supernatant with sodium bicarbonate, and volatilizing the solvent in the lower layer to leave the lilac flower extract. Mixing bentonite and active carbon first and mixing with the lilac flower extract then can produce the fumigating fruit and vegetable preservative. The fruit and vegetable preservative has obvious and lasting inhibition on blue mold and Aspergillus niger with serious infection to cut of fruit and vegetable, has active effective period as long as 15 months, and may be used in preserve various kinds of fruits and vegetable.

The invention discloses a preparation method of silk fibre with a function of removing formaldehyde, mainly comprising the following steps: (1) dissolving procyanidin with the weight equivalent to 8-12 percent of the silk fibre into water, adding 0.2-0.5 milliliters of glacial acetic acid per each litre of water into the solution and uniformly stirring, adding ferrous sulphate into the solution according to the mass ratio of the ferrous sulphate to the procyanidin of 1 to 1-3 and stirring, adding a sodium bicarbonate solution into the solution to regulate the pH value of the mixing solution to 5-8, increasing the temperature of the mixing solution to 50-60 DEG C, and preserving the heat of the mixing solution for 20-40 minutes; (2) adding 0.5 gram of peregal O and 2-10 grams of salt intoeach litre of the obtained mixing solution and uniformly stirring; (3) adding the silk fibre into the obtained mixing solution and processing for 1-12 hours under the conditions that temperature is 25-90 DEG C and liquor ratio is 1 to 20-40, and then taking the silk fibre out and washing and drying the silk fibre. The obtained silk fibre can enable the removal rate of the formaldehyde contained inindoor air to achieve more than 75 percent.

The invention discloses a preparation method and application of an ultrasonic impregnation modified resin. The preparation method comprises: adding a certain volume of fresh resin into a sodium chloride solution to conduct soaking pretreatment; subjecting the pretreated resin and a KMnO4 solution to mixing impregnation, and conducting rapid stirring, then performing washing with deionized water and conducting filtration until the filtrate is colorless; adding the obtained impregnated resin rapidly into an FeSO4.7H2O solution by certain volume ratio, and carrying out sealing and ultrasonic impregnation, after full reaction, using a sodium bicarbonate solution and deionized water to perform alternating flushing to neutral pH, and conducting vacuum drying, thus obtaining the ultrasonic impregnated FeOOH modified resin. Compared with unmodified resin, the resin provided by the invention has greatly improved nitrate removal performance, has a removal rate to 10mg / L nitrate water up to 100%, shows very high adsorption efficiency, and can be widely applied in the field of water treatment.

The invention relates to a preparation method for a visible-light-driven photocatalyst compositing bismuth oxychloride / silver carbonate. The preparation method comprises the following steps: preparing bismuth oxychloride; adding bismuth oxychloride into distilled water, performing ultrasonic stirring, adding silver nitrate, performing stirring, adding a sodium bicarbonate solution dropwise, performing stirring, performing centrifugation, washing the product by ethanol and water in turn, and drying the product. The preparation method is simple, and the preparation condition is easy to control. Moreover, the prepared visible-light-driven photocatalyst compositing bismuth oxychloride / silver carbonate is a green catalyst with high performance, is pollution-free, has high catalytic efficiency, and has a certain application value.

The invention relates to a method for preparing high-molecule-ratio cryolite by using phosphoric acid industrial fluorine-containing waste gas, belonging to the field of inorganic chemical engineering. Fluorine-containing waste gas is absorbed by adopting circulation of a sodium bicarbonate solution, so that the problems of secondary pollution and high processing cost in a process of treating the fluorine-containing waste gas are solved, and chemical products such as cryolite, white carbon black, and the like with high additional value are prepared at low cost by using the fluorine-containing waste gas. The principle is as follows: HF and SiF4 in the fluorine-containing waste gas are absorbed by using sodium bicarbonate so as to generate NaF and SiO2.H2O; by using the characteristic that the NaF is slightly dissolved in water and SiO2.H2O is not dissolved in a NaHCO3 solution, the SiO2.H2O is removed through filtering and further processed into white carbon black; and the white carbon black with high specific surface area can be prepared through changing the pH of an absorption solution. The filtered NaF solution reacts with NaAlO2, and CO2 is blown, so that the cryolite can be prepared; and the cryolite with molecule ratio of more than 2.90 can be prepared through controlling excessive percentage of the NaF. The invention can be used in treatment of the fluorine-containing waste gas in phosphoric acid and phosphatic fertilizer industries.

The invention discloses a method for plating chromium by using trivalent chromium. The method comprises that rare earth oxide is dissolved in acid and is prepared into rare earth salt solution; water is used to dissolve chromium sulfate salt, aluminum sulfate, sodium fluoride, urea and complexing agent, the obtained mixture is added with the obtained rare earth salt solution, sodium hydrogen carbonate solution is used to adjust the pH value of the solution and the obtained solution is prepared into plating solution containing chromium sulfate salt, aluminum sulfate, sodium fluoride, urea, complexing agent and rare earth salt; a part to be plated is put into the plating solution and is plated, and the technological conditions for plating control are that: current density is 28-90A / dm2, the pH value of the plating value is 1-4, the temperature is 25-60 DEG C, the agitator speed is 100-600rpm and the plating time is 30-90min; and after the plating is completed, the plated part is washed by water and is air-dried, so the plating of the part to be plated by using the trivalent chromium is completed. The rigidity and the wear resistance of the obtained chromium-plated layer are obviously improved, the rigidity is more than or equal to 815HV and the wear mass is less than or equal to 0.08mg.