95results about How to "Low pH" patented technology

The invention discloses a polymeric aluminum sulfate synthesis method and discloses a preparation method of a novel alkali-free liquid accelerator based on synthesis of polymeric aluminum sulfate. According to the alkali-free accelerator, an aluminum sulfate solution is neutralized by ammonia water, active aluminum hydroxide gel is prepared, active aluminum hydroxide is filtered, dried and ground into powder, then the aluminum sulfate solution is added, and the polymeric aluminum sulfate is prepared. The alkali-free accelerator comprises, in percentage, 45%-55% of the polymeric aluminum sulfate, 0%-5% of inorganic acid, 0%-2% of a stabilizer, 0%-2% of an organic early strength agent, 0%-2% of an organic tackifier and the balance of water. The cement setting time and the colloidal mortar strength of the accelerator can meet the requirement of first-class accelerators for JC477-2005 sprayed concrete under the condition of the lower mixing amount, and meanwhile, the accelerator is an alkali-free liquid accelerator and can effectively avoid adverse effects caused by excessively high alkali content. The cement types of the accelerator have good adaptability.

A method of processing a substrate having a conductive material layer disposed thereon is provided which includes positioning the substrate in a process apparatus and supplying a first polishing composition between to the substrate. The polishing composition comprises phosphoric acid, at least one chelating agent, a corrosion inhibitor, a salt, an oxidizer, abrasive particulates, at least one pH adjusting agent to provide a pH from about 4 to about 7 and a solvent. The method further includes forming a passivation layer on the conductive material layer, removing the passivation layer to expose a portion of the conductive material layer, applying a first bias to the substrate, and removing at least about 50% of the conductive material layer. The method further includes separating the substrate from the first polishing composition, exposing the substrate to a second polishing composition and a second bias, and continuing to remove the conductive material layer.

The invention discloses a lactic acid bacteria semi-solid fermentation product. The product is prepared by the following processes: inoculating lactic acid bacteria in raw materials and fermenting at a temperature of 24-44 DEG C for 24-40h to obtain the product. The raw materials comprise 4.0-5.0g of wheat bran, 1.2-1.8g of soybean meal, 0.8-1.2g of glucose or brown sugar, and water, wherein water is added until the total amount of the raw materials is up to 100mL. The inoculation amount of the lactic acid bacteria is 1.0-2.0*10<7>cfu / 100mL, wherein the lactic acid bacteria is composed of Lactobacillus plantarum and Pediococcus pentosaceus with a strain viable count ratio of (3:10)-(10:3). The lactic acid bacteria semi-solid fermentation product for increasing growth performance of animals provided by the invention is the first fluid fermentation feed independently developed in China according to the national conditions for culture, inherits the advantages of the traditional solid fermentation feeds, and at the same time has the advantages of being more convenient, fresher, more significant in feeding effects, lower in cost and the like.

There is described a method for converting oripavine to hydromorphone or a physiologically acceptable salt thereof such as hydromorphone hydrochloride involving generation of 8,14-dihydrooripavine utilising diimine.

The invention discloses a high-nickel positive electrode material with a composite coating layer and a preparation method thereof. The preparation method comprises the following steps: (1) uniformly mixing a high-nickel positive electrode material and a nano-coating material, and carrying out high-temperature sintering, cooling, crushing and sieving in a preheated muffle furnace under an oxygen atmosphere to obtain a nano-material-coated high-nickel positive electrode material; and (2) adding the high-nickel positive electrode material coated with the nano material into deionized water dissolved with a soluble lithium compound, uniformly stirring, slowly adding soluble phosphate, uniformly stirring, carrying out vacuum filtration, drying and re-burning in a kiln, cooling, crushing and sieving to obtain the high-nickel positive electrode material with the composite coating layer. According to the high-nickel positive electrode material with a composite coating layer and the preparationmethod thereof, multi-layer uniform coating of the nano material and phosphate is realized through dry-process and wet-process coating, and the prepared positive electrode material has the advantagesof good cycle performance, good thermal stability and the like, and the preparation process is simple, and the positive electrode material can be used for industrial mass production and has a wide application prospect in lithium ion battery production.

The invention discloses a dephosphorization flocculating agent and a preparation method thereof. The dephosphorization flocculating agent is formed by compounding an inorganic flocculating agent and an organic flocculating agent. The raw materials of the inorganic flocculating agent comprise sodium ferrate, borax, ferrous sulfate, silicate or aluminate; the raw materials of the organic flocculating agent comprise modified chitosan or modified polyacrylamide. The preparation process comprises the following steps: firstly adding a non-oxidizing acid into the silicate or aluminate to obtain a polysilicate colloid or an aluminum hydroxide colloid, then adding a borax solution and a sodium ferrate solution sequentially while stirring, further dropping a ferrous sulfate solution, mixing to form the inorganic flocculating agent, standing, then adding the modified polyacrylamide or modified chitosan into the inorganic flocculating agent, curing and adding the acid till the pH value is less than 7 to obtain the finished dephosphorization flocculating agent. The flocculating agent is suitable for a wide range of water quality, is little affected by co-existing salts, the pH value of sewage and temperature and is particularly effective for dye wastewater, oilfield sewage and the like.

The invention relates to a chemical reagent and especially relates to a novel sewage treatment agent and belongs to the field of sewage treatment. The novel sewage treatment agent comprises, by weight, 25 to 40 parts of polyferric chloride, 10 to 15 parts of polyacrylamide, 7 to 12 parts of polymine and 28 to 43 parts of bentonite. The polyferric chloride can be dissolved in water easily and has excellent coagulation effects and good product stability. The novel sewage treatment agent has a wide pH application range. A pH value of water treated by the novel sewage treatment agent is reduced slightly. Through utilization of an inorganic-organic component mixture as a coagulant, excellent coagulation effects are obtained. The novel sewage treatment agent has the advantages of fast purification rate, good effect, environmental benefits and no toxicity.

The invention discloses a preparation method of a high-capacity ternary positive electrode material. The method comprises the steps of carrying out dry mixing on nickel, cobalt and aluminum hydroxideand a lithium salt and then carrying out primary sintering; washing a product of primary sintering by using pure water, drying the product and carrying out solid-phase mixing on the product and nano metal oxide; and carrying out secondary calcining and then preparing a high-capacity ternary LiNi0.8Co0.15Al0.05O2 positive electrode material of primary spherical particles. When the LiNi0.8Co0.15Al0.05O2 positive electrode material prepared by adopting the preparation method is applied to a button battery at 4.3V and 0.1C, the gram volume can reach 200mAh g<-1>, the capacity retention ratio after100 cycles at the rate of 1C is higher than 96% and the amount of residual alkali on the surface is lower than 0.3wt.% and the pH is smaller than 11.7.

The invention discloses a self-healing environment-friendly type steel normal-temperature blackening agent which takes a molybdate / sulfur-copper system as a main membrane component and which consists of 12-22g / L of copper nitrate, 14-24g / L of ammonium molybdate tetrahydrate, 8-12g / L of sodium thiosulfate, 18-28g / L of monosodium phosphate, 3-5g / L of oxalic acid, 6-13g / L of nickel sulfate, 3-5g / L of dimethylformamide, 0.5-1g / L of lanthanum oxide, 30-40g / L of aluminum potassium sulfate, 4-10g / L of sodium chloride, 2-6g / L of citric acid, and a surfactant. The blackening agent is high in blackening capability, free of selenium, environment-friendly, low in production cost and simple in process; a steel normal-temperature blackening film layer obtained through blackening has the characteristics that the corrosion resistance and the healing capability are good, a blacking film is free of crack, the film layer is uniform and dark and bright in color, and the adhesion capability and the corrosion resistance are excellent; and the technical indexes of the blackening film layer are that the 3% copper sulfate drop test lasts for 65 seconds (the blackening film layer is not dipped into anti-rust oil), the 3% sodium chloride soaking test lasts for 8 hours, and the binding force is greater than 187 times.

The invention provides a nickel and manganese blended lithium ion battery positive material and a preparation method thereof. The method comprises the following steps: carrying out two-stage roasting on a high-nickel material precursor and a lithium source as raw materials to prepare a high-nickel positive material, and blending the prepared high-nickel positive material with a lithium manganate positive material to prepare the nickel and manganese blended lithium ion battery positive material for a power battery. The prepared positive material has the advantages of high safety and good cycle performances, and the preparation method of the positive material has the advantages of simplicity, easy implementation, wide sources of the raw materials, and low cost.

The invention provides a fermented meat. The fermented meat comprises, by weight, 80-100 parts of raw meat, 1-20 parts of fat, 1-15 parts of carbohydrate, 1.602-21.75 parts of a curing agent, 0.001-1 part of a fermenting agent, 0.205-3.55 parts of a spice, 0.0005-0.01 parts of an edible pigment, 0.05-1 part of a water retaining agent, and 1-10 parts of soybean protein isolate. The fermented meat has the advantages of high heat energy density, long shelf life (above two years), strong plasticity, eating convenience and abundant nutrition. A fermented meat product, especially once a block of a fermented meat product, has the characteristics of convenient carrying (small size and light weight), eating convenience (instant eating after bag opening, and convenient one-handed operation), high heat energy density, rapid energy supplement, and long shelf life, and is suitable for the energy supplement during long-time motor vehicle driving, long-distance flying, long marches and intensive excises.

The invention discloses a preparation method of a high-nickel positive electrode material, which comprises the following steps: uniformly mixing up a Ni-containing hydroxide, a lithium-containing compound and a doping element, and calcining to obtain a base material A after the mixing operation; adding the base material A into a washing solution, controlling the temperature of the washing solution, washing away residual lithium carbonate and lithium hydroxide on the surface, adding a lithium-containing compound into the washing solution, and drying the washed base material to obtain a mixtureB; uniformly mixing the mixture B, a coating element and a lithium-containing compound, calcining, and crushing to obtain the finally modified high-nickel positive electrode material. The high-temperature stability of the nickel material is improved through doping. The residual lithium carbonate and lithium hydroxide on the surface are reduced through washing. The water absorption and processing performance of the material is improved. The damage to the surface of the material during washing can be repaired through coating. The direct contact between the positive electrode material and the electrolyte can be reduced, so that the high-temperature characteristic and long-cycle performance of the battery cell are improved.

The invention relates to an application of a compound leavening agent in a pork fermented sausage, discloses Leuconostoc mesenteroides with the collection number of CGMCC (China General Microbiological Culture Collection Center) 11479 and further discloses a compound leavening bacterium containing the strain. Pork is taken as a main raw material, and through inoculation of the leavening bacterium comprising staphylococcus xylosus CGMCC3474, Leuconostoc mesenteroides CGMCC11479, lactobacillus plantarum CGMCC11480 and Debaryomyces hansenii CGMCC3473, the edible safety, the trophism and the sensory quality of the pork fermented sausage are improved. Further, the pH of the fermented sausage added with the compound leavening agent is remarkably lower than that of the traditional fermented sausage, growth and propagation of harmful bacteria are inhibited effectively, and the shelf life of the pork fermented sausage can be prolonged to a certain extent.

The present invention relates to the technological process of film extracting L-phynylalanine as medicine intermediate. To L-phynylalanine solution prepared with pyenyl-pyruvic acid through enzyme process, the film separation process, including eliminating thallus and cell fragment, ultrafiltration to elimiante hybrid protein, nanometer filtering to desalt and decolor and concentrate, to separate and extract target product. The said process has L-phynylalanine yield over 85%, and compared with available extraction process including ion exchange and metal salt precipitation, the said process has higher yield, and less consumption of acid, alkali, water and steam.

Milk or a milk derivative is treated with a chelating agent in a manner that provides sufficient turbulence during mixing to avoid localized protein precipitation. The chelating agent is added to the milk or the milk derivative between a pH of about 5.8 and 6.6. The milk or the milk derivative is then subjected to ultrafiltration wherein calcium freed from the milk or the milk derivative is passed as a permeate and a retentate is retained as the cheese base.

The invention relates to a Lactobacillus plantarum strain JP-8 and a process for fermentation of sea asparagus puree by the strain to prepare ready-to-eat crisp chips. The strain is preserved in China General Microbiological Culture Collection Center on September 29, 2013 with a preservation number of CGMCC No.8289. The employed technical scheme includes: (1) using am MRS culture medium to prepare a Lactobacillus plantarum JP-8 seed bacterial liquid; (2) pulping sea asparagus, inoculating the seed bacterial liquid, and conducting anaerobic fermentation; and (3) preparing sea asparagus ready-to-eat crisp chips by means of material mixing, material spreading in a tray, hot air drying, microwave vacuum drying, and nitrogen-filled packaging. Through fermentation by the Lactobacillus plantarum, the quality (nutrition, flavor, shelf life and the like) of the sea asparagus ready-to-eat crisp chips is improved. According to the invention, hot air drying and microwave vacuum drying technologies are adopted successively, while the taste of the crisp chips is improved, and the flavor and nutrients of sea asparagus are reserved to the utmost, the production cycle is shortened, the energy consumption is reduced, and the production cost is lowered.

The invention relates to an improved method for producing pigment carbon black. The method comprises the following steps: heating and dehydrating raw oil, conveying the heated raw oil to a vaporizing tank through a pipeline, heating the vaporizing tank so as to vaporize the raw oil, enabling preheated combustible gas to pass through a liquid level of the raw oil in the vaporizing tank so as to mix the oil vapor with the combustible gas, conveying the mixed gas to a carbon black reactor for incomplete combustion and cracking through an oil gas header pipe to produce carbon black, cooling the carbon black and then conveying the cooled carbon black into a pelletizer for pelletizing, performing magnetic separation on the pelletized carbon black, then conveying into an oxidizing machine for performing thermal oxidation treatment, conveying the thermal oxidation-treated carbon black into a cooling tank for cooling to normal temperature, and then conveying to a carbon black storage tank for packaging and storing. The water-soluble pigment carbon black produced by adopting the method is high in volatile matters and dispersity as well as color intensity and low in pH value. The application performances of the pigment carbon black on oil ink, leather, coating, paint and the like can be greatly improved.

The invention relates to a method for preparing full-plant corn silage by cellar pressing, which comprises the steps of cleaning a storage cellar, pressing the cellar, sealing the cellar and fermenting. The pressure storage of each silage layer adopts specific parameters, each ton of silage is added with 2-6 grams of a fermenting agent and 8-10 grams of a silage additive; after compaction, the thickness of each silage layer is 10cm-20cm, and the density is 700kg / m <3>;; The temperature of the silage cellar is selected to be in a normal temperature environment; the cellar-pressing silage is completed within 10 hours after the silage raw materials are harvested; wherein the water content of the silage raw material is ensured to be between 62% and 74% when harvesting; lactobacillus plantarumand pediococcus lactis are selected as the silage fermenting agent, and the dosage ratio of the lactobacillus plantarum and the pediococcus lactis is 2: 1; the silage additive is selected from cellulase, xylanase and calcium sodium silicate hydrate, and the dosage ratio of the cellulase to the xylanase to the calcium silicate hydrate is 5: 3: 2; according to the invention, the prepared silage hashigher water content, and the silage is fresh, tender and juicy; The content of soluble sugar and the consumption rate of crude protein in the silage are reduced to a lower degree, and nutrients in the silage are better retained; the pH value is lower, thereby being more beneficial to long-term stable storage of the silage.

The invention discloses a Lactobacillus paracasei 761, application of the Lactobacillus paracasei 761, a silage additive and silage. The Lactobacillus paracasei 761 is deposited at China General Microbiological Culture Collection Center, and the deposit number is CGMCCNo.18234; the Lactobacillus paracasei 761 can improve the quality of the silage in high-temperature and high-humidity areas, and the silage treated by the Lactobacillus paracasei 761 has better aerobic stability, can reduce pH, aflatoxin B1 and dry matter loss and has good high-temperature resistance and acid resistance and goodadaptability to the environment, under culturing in high-temperature conditions, the growth and acid production of the Lactobacillus paracasei 761 has no significant lag phase, and can achieve rapid acid production to achieve the effect of lower pH .

The invention discloses an oil-containing sludge resourceful treatment technology, which comprises the following steps: oil-containing sludge in a raw material sludge storage pond is introduced in a sludge mixing tank for demulsification treatment, the oil-containing sludge after demulsification is introduced in a spiral sludge dewatering machine for solid-liquid separation to obtain a filtrate and mud cakes, the filtrate is introduced in a gas-liquid mixing tank for mixing with air, a mixture is introduced in a separation tank for oil, water and mud three-phase separating. According to the technology, water content of the oil-containing sludge is decreased from 80-98% to about 50%, most crude oil in the oil-containing sludge can be recovered, and subsequent processing difficulty of sludge can be greatly reduced. The technology has the advantages of wide application scope, and is especially suitable for treatment of oil sludge at bottom of pot, scum and activated sludge, and can be used for treating various kinds of oil-containing sludge generated by petroleum exploitation, storage and transportation enterprises.

The invention discloses an alkaline compound fertilizer for preventing and improving soil acidification and a preparation method of the alkaline compound fertilizer, belonging to the technical field of compound fertilizers. The alkaline compound fertilizer comprises the following raw materials in percentage by weight: 10-30% of urea, 6-40% of diammonium phosphate, 0-30% of potassium sulfate, 1-5% of calcium oxide and 1-15% of calcium carbonate. The preparation method comprises the following steps: taking calcium oxide, calcium carbonate, urea and potassium sulfate in a proportion, respectively crushing the obtained raw materials into powder, uniformly mixing, heating the obtained mixture, feeding the obtained object into a drum-type granulator to granulate, after granulating is completed, feeding the obtained product and diammonium phosphate particles in a proportion into a mixer, and uniformly mixing, so that a finished product is obtained. In the alkaline compound fertilizer, by taking calcium oxide as an alkaline component and taking calcium carbonate as an isolating agent and a pH value buffering agent, an alkaline raw material and physiologically acidic potassium sulfate are premixed so as to obtain particles, and then the particles are mixed with diammonium phosphate particles with a pH value similar to that of the particles, so that a situation that the alkaline raw material reacts with the diammonium phosphate so as to cause the loss of nitrogen elements and the activity reduction of phosphorus elements does not occur.

Negative-working imageable elements can be imaged and then developed using a lower pH organic-based single-phase developer that is less toxic and corrosive and that can be more readily disposed of after use. This developer has a pH less than 12 and comprises a) an amphoteric surfactant comprising a nitrogen-containing heterocycle, b) an amphoteric surfactant having two or more nitrogen atoms, or c) an amphoteric surfactant of a) and an amphoteric surfactant of b).

The invention belongs to the technical field of biological analysis, and provides prefabricated test powder for rapidly preparing a nucleic acid electrophoretic buffer solution based on taurine and ause method thereof. The prefabricated test powder comprises the following components by weight: based on preparation of 1 L of the electrophoretic buffer solution with one-time (1*) concentration, each part of the prefabricated test powder contains 9.6-12 g of Tris base, 3.755-7.51 g of taurine, and 0.186-0.744 g of Na2EDTA.2H2O. At room temperature, each part of the test powder is fully mixed andmutually soluble with 1 L of deionized water, 1L of the electrophoretic buffer solution with 1* concentration is obtained, and the pH value of the electrophoretic buffer solution is 8.7-9.2. The prepared prefabricated test powder provided by the invention can rapidly prepare the nucleic acid electrophoretic buffer solution with fixed concentration and fixed pH value. The prepared buffer solutionhas long electrophoretic life and good positive and negative electrode stability. The prepared electrophoretic buffer solution is in favor of protection of DNA and RNA against degrading during electrophoresis, maintains a stable double-helix secondary structure, and enhances the accuracy and sensitivity of fluorescence detection after nucleic acid electrophoresis.

The invention mainly relates to the technical field of fruit tree planting, and discloses a planting method of selenium-rich carya illinoensis. The method comprises the steps of stock selection, scion selection, grafting treatment, management after grafting, winter top-dressing and fructescence fertilization spraying. Through the simple method, the selenium content of ripe carya illinoensis reaches 16.72 microgram / 100 g, the shell thickness is reduced by 28.6%, which makes it easy to eat by removing shells, and thus the sales volume of the ripe carya illinoensis is increased by 14.8%, and the economic income of farmer households is remarkably increased; ginkgo seedlings which are 2-3 years old are selected as stocks, the main stems are thick, so many nutrients are accumulated, the stocks are prepared after leaves fall in autumn, and are wrapped with nonwovens soaked with chitosan to promote wound healing and avoid germs breeding caused by too much tree flow at big wounds after grafting, scions are promoted to survive, and thus the survival rate reaches 98%, and the manpower and material resources are saved greatly.

The invention provides a feed acidifying agent and a preparation method thereof. The feed acidifying agent comprises 1-10 wt% of hydrochloric acid, 20-80 wt% of an organic acid, 1-30 wt% of bentonite,5-30 wt% of a filler and 5-30 wt% of a coating material. The preparation method comprises the following steps: 1) adding the hydrochloric acid and bentonite into a mixer, and uniformly mixing the hydrochloric acid with bentonite; 2) adding the organic acid and the filler into the mixer, and uniformly mixing above materials to obtain a soft material; 3) placing the soft material prepared in step 2) in a swing machine, and swinging the soft material by a screen to prepare granules; 4) drying the granules obtained in step 3) in a boiling bed, and allowing the dried granules to go through a screen; and 5) processing the coating material to form a coating solution, placing the granules in a coating pan, coating the granules by using the coating solution, drying the coated granules after spraying of the coating solution is completed, and allowing the dried coated granules to go through the screen in order to obtain the feed acidifying agent. The hydrochloric acid and the organic acid are successfully cooperatively used to make the acidifying agent have a good pH value adjusting effect, and has a stronger inhibition effect on existing acidifying agents.

The invention is suitable for the medicinal technical field and provides a charge conversion type nanometer drug carrier and a preparation method thereof. The charge conversion type nanometer drug carrier comprises an inner core and an outer core, wherein the inner core is served as a carrier main body; the outer core is served as a carrier lock for performing charge conversion on the carrier main body; the inner core and the outer core are combined under the effects of positive and negative charges; the carrier main body is made from the target peptide modified polyethylene glycol-hydrophobic modified chitosan with positive charges; the carrier lock is made from polylysine with the side chain modified with 2,3-dimethyl maleic acid. The charge conversion type nanometer drug carrier provided by the invention has a dual-charge conversion function; the negative charges are loaded on the surface of the charge conversion type nanometer drug carrier; under a weak acid condition, the carrier lock is opened, the carrier charges are reversed, the negative charges are reversed into positive charges, the target peptide is exposed on the micellar surface, a targeting function is achieved and the blood brain barrier is overcome.

The invention mainly relates to the technical field of weaving handicrafts, and discloses a method for drying and preventing cracking of rattan, comprising: rattan fermentation, primary drying, and secondary drying; the method is simple, easy to operate, and reduces the fracture rate of rattan weaving by 8.5% %, drying and anti-cracking are treated at the same time, the treatment time is shortened to 17-18 days, the utilization rate of the rattan is improved, and the production cost is saved; after the fresh rattan bark is stacked, the fermentation liquid is sprayed and covered with a black plastic film, Promote the proliferation of Lactobacillus plantarum and yeast in the fermentation broth, slowly ferment the rattan, gradually reduce the pH to 4.6~4.8, and produce extracellular metabolites rich in polypeptides, polysaccharides and fats, which gradually penetrate into the rattan tissue and soften the rattan bark And the fiber structure of the rattan core, so that both the rattan bark and the rattan core can be used for weaving, which improves the weaving performance of the rattan and reduces breakage.

The invention is suitable for the technical field of medicines and provides a charge transfer type nano pharmaceutical composition and a preparation method thereof. The charge transfer type nano pharmaceutical composition is prepared from a drug-loading inner core and an outer core; the outer core is a carrier lock for carrying out charge transfer on the drug-loading inner core; the drug-loading inner core is combined with the outer core by a positive and negative charge action; a carrier of the drug-loading inner core is positively-charged and targeting peptide-modified polyethylene glycol-hydrophobic modified chitosan; the drug is a hydrophobic drug and loaded in the carrier; the carrier lock is polylysine of which a side chain is modified with 2,3-dimethyl maleic acid. According to the charge transfer type nano pharmaceutical composition provided by the invention, the combination of multiple drugs and multiple diagnosis and treatment methods is realized, so that a new path is opened for tumor diseases.

The invention discloses a method for recovering nickel sulfate from nickel electroplating waste liquid. The method comprises the following steps: (1) adding alkali liquor and sodium hydrosulfite intothe nickel electroplating waste liquid, carrying out heating and stirring, and carrying out solid-liquid separation after a reaction to obtain filter residues and a filtrate; (2) carrying out acid dissolution on the filter residues to obtain an acid-soluble solution, wherein a pH value of an acid dissolution end point is 5 or below; (3) adding an extraction agent into the acid-soluble solution toextract nickel so as to obtain a water phase and an oil phase enriched with nickel ions, and adding sulfuric acid into the oil phase enriched with the nickel ions for reverse extraction so as to obtain a nickel sulfate solution; and (4) carrying out evaporation concentration, cooling crystallization and solid-liquid separation on the nickel sulfate solution to obtain a liquid phase and a solid phase, and collecting the solid phase to obtain nickel sulfate. According to the method, on the premise that the treatment cost of the nickel electroplating waste liquid of an enterprise is greatly reduced, high-quality and high-value byproducts can be obtained, and an economic value is high.