28results about How to "High extraction purity" patented technology

The invention relates to the technical field of grease processing, in particular to a preparation method for extracting refined vegetable oil fatty acid. A preparation method for refined vegetable oil fatty acid extraction comprises the following steps: vegetable oil refining treatment and refined vegetable oil fatty acid separation and extraction. In the vegetable oil refining treatment process, the degummed vegetable oil is subjected to deacidification and decolorization treatment by using the modified rice hull-based porous carbon, so that pigments, free fatty acids and heavy metal components in the vegetable oil can be efficiently adsorbed, the effects of adsorption, deacidification and decolorization are achieved at the same time, and the vegetable oil refining efficiency is effectively improved; vegetable oil refining quality is improved, so that the extraction effect of refined vegetable oil fatty acid is improved; in the separation and extraction process of fatty acid in the refined vegetable oil, the contact between urea and saturated fatty acid in the refined vegetable oil can be promoted by adding the crystallization inclusion additive, and a stably-clathrated composite crystal is quickly formed, so that the extraction purity of unsaturated fatty acid is improved.

The invention discloses an exosome extraction method based on plant juice characteristics. The method comprises the following steps: firstly, according to the characteristics of plant juice, dividing samples into four types, namely a clear low-viscosity type sample, a medium-thick type sample, a high-viscosity type sample and a high-fiber type sample, and adopting different pretreatment modes: washing the clear type sample, cutting into blocks, and directly juicing; performing enzymolysis after medium-concentration washing and juicing; performing enzymolysis after high-viscosity homogenate juicing; and the high-fiber type is firstly subjected to enzymolysis and softening, and then homogenate and squeeze juice. Removing impurities through two-step differential centrifugation, and finally obtaining the high-purity exosome through ultrafiltration concentration, PEG precipitation, PBS resuspension and filtration. According to the method disclosed by the invention, various means such as physical crushing, enzymolysis, differential centrifugation, ultrafiltration and precipitation are comprehensively utilized, so that the yield and purity of the exosome are greatly improved, the varieties of plants for preparing the exosome are widened, and a technical support is provided for application research of the plant exosome.

The invention belongs to the technical field of spectral analysis, and particularly relates to a pharmaceutical volatile oil extraction interface detection method and system based on spectral analysis, and the method comprises the following steps: synchronously collecting water transmission light intensity and oil transmission light intensity at a plurality of vertical sampling heights, and combining initial calibration light intensity to obtain a phase state contrast; obtaining a scattering penalty weight in combination with the reference transmission light intensity; acquiring a compensation interface gradient based on the scattering penalty weight and the phase state contrast; performing global peak search on the compensation interface gradient to extract the interface height and the compensation interface gradient extreme value, and further obtaining the emulsification turbidity; and obtaining a safe oil collection index based on the set reference elevation, the interface height and the emulsification turbidity, and carrying out automatic liquid outlet control based on the safe oil collection index. According to the method, physical noise is effectively filtered to accurately lock a real chemical interface, a decision model of comprehensive purity and reserves is constructed, and the extraction purity and batch-to-batch stability of volatile oil are improved.

The application belongs to the technical field of natural substance separation and extraction, and particularly relates to a kind of Haematococcus pluvialis multi-product cascade separation method based on eutectic solvent sequential extraction and enzyme membrane reactor coupling, comprising the following steps: (1) cell wall weakening pretreatment step; (2) water-soluble component extraction step; (3) pigment component extraction step; (4) astaxanthin extraction step; (5) enzyme conversion step. Through the synergistic effect of eutectic solvent sequential extraction and enzyme membrane reactor, efficient, green and continuous cascade separation of water-soluble components, pigments, astaxanthin and xylo-oligosaccharides in Haematococcus pluvialis is realized, and product purity and resource utilization are improved.

The invention discloses a preparation method and application of a kava extract with soothing and anti-allergy capacities, and the preparation method comprises the following steps: putting kava pepper root powder into an extraction tank, and carrying out subcritical extraction on the kava pepper root powder by using an organic solvent as an extraction solvent to obtain an extraction liquid; sequentially carrying out reduced pressure evaporation and filtration on the extract to obtain a crude extract; adding the crude extract into a feeding bottle of molecular distillation equipment, and carrying out molecular distillation treatment to obtain yellow oily liquid; and finally, drying the yellow oily liquid to obtain the kavalactone extract. The method has the characteristics of high extraction efficiency, no solvent residue and low preparation cost.

The invention discloses an intelligent nutrient content extraction device and an extraction method thereof. Belongs to the field of food science and nutriology. The device comprises a pupa removing machine, intelligent algorithm regulation and control equipment, a pulverizer, a dryer, an ultrasonic extractor, membrane separation equipment, a soft capsule machine and detection equipment, according to the extraction method, tussah is selected to prepare medicines according to daily nutritional requirements of old people; the method comprises the following steps: collecting high-quality tussah, separating, cleaning, drying, crushing, and efficiently extracting effective components by utilizing ultrasonic waves; and separating and purifying the extracting solution through a membrane to obtain a high-purity medicinal component, and processing the high-purity medicinal component into a gelatin capsule. Process parameters are strictly controlled in the whole process; performing quality detection and safety evaluation; the tussah is rich in required energy, protein, mineral substances and vitamins, and the finished product of the tussah not only meets nutritional requirements, but also has various health-care effects. The method has the characteristics of integrated equipment and system optimization, efficient extraction technology, high-purity purification process and customized nutrition.

The application belongs to the technical field of medicines, and specifically discloses an anti-depression m-hydroxybenzoic acid compound and a preparation method and application thereof; the m-hydroxybenzoic acid compound Hyperioxides A-F provided by the application has not been reported; the six compounds have good anti-depression effects, and further research shows that the compounds Hyperioxide A, Hyperioxide D, Hyperioxide E and Hyperioxide F have significant protective effects on SH-SY5Y cells induced by corticosterone, and are superior to positive drugs fluoxetine and Luoyoutei, and can be used for developing drugs for treating depression.

The application provides a traditional Chinese medicine purification device, which comprises a first medicine liquid alcohol precipitation tank and a second medicine liquid alcohol precipitation tank, the first medicine liquid alcohol precipitation tank is connected with a first liquid storage tank, the second medicine liquid alcohol precipitation tank is connected with a second liquid storage tank, the first liquid storage tank and the second liquid storage tank are connected with a third liquid storage tank, a central transmission shaft is arranged in the first medicine liquid alcohol precipitation tank and the second medicine liquid alcohol precipitation tank, a spraying stirring structure and a medicine liquid extraction structure are arranged on the central transmission shaft, and a heating system is arranged on the spraying stirring structure. The use method of the traditional Chinese medicine purification device is characterized in that the spraying stirring structure uniformly sprays alcohol liquid in the medicine liquid alcohol precipitation tank and stirs the alcohol liquid at the same time, so that the alcohol liquid and the medicine liquid fully act on each other, the alcohol liquid is injected into the alcohol precipitation tank through the hole and is stirred at the same time, and the mixed liquid is sucked into the liquid storage tank through the hole, so that the structure is simple, the stirring is sufficient, the flow is controllable, and the filtration is sufficient.

The present application belongs to the field of electric digital data processing, and relates to a kind of digital data processing system of corrugated production line operating state, comprising: data acquisition unit, feature storage unit, offset solving unit and parameter compensation unit, data acquisition unit obtains the heterogeneous time sequence data stream of controlled node;Feature storage unit carries out dimensional alignment in digital storage space to construct historical delay feature matrix;Offset solving unit calculates addressing address increment according to the correlation mapping relationship between reference feature and auxiliary feature;Parameter compensation unit carries out logical shift to read pointer according to addressing address increment, points to the historical state slice with correlation, and outputs the feedforward compensation control parameter for hedging response delay, the present application eliminates causal drift generated by flexible medium transmission through asynchronous addressing mechanism of digital storage space, realizes accurate matching of control parameter time sequence and mechanical response phase, and guarantees tension stability under high-speed operating state.

The present invention relates to the technical field of enzymatic extraction of functional peptides, and more particularly to a method and application thereof for extracting hypoglycemic active peptides from sheep bones, S1: bone residue is prepared; S2: bone powder is prepared; S3: first defatting treatment is carried out with a composite degreasing agent, and the composite degreasing agent is mixed by food-grade lipase and sodium glycocholate according to a mass ratio of 1: (0.1-0.15); S4: second defatting treatment is carried out with anhydrous ethanol; S5: enzymolysis treatment is carried out to the obtained defatted bone powder B in sequence by the first protease and the second protease, and the first protease is collagenase, and the second composite protease is mixed by aminopeptidase and serine protease according to a mass ratio of 1: (1-3); S6: after the obtained active peptide suspension is de-enzymed, centrifuged and freeze-dried, hypoglycemic active peptides are obtained. The present invention uses sheep bones as raw materials for the first time, and is efficiently extracted with small molecule hypoglycemic active peptides through secondary defatting and two protease segmented enzymolysis treatments.

The invention provides an aloe capsule and a preparation method thereof, the capsule comprises purified aloe gel powder, an aloe polysaccharide extract, composite prebiotics, an antioxidant plant extract, vitamin E, dietary fibers, glycerin and other components, and has the effects of relaxing bowel, enhancing immunity and the like. The preparation method comprises the steps of ultrafiltration, ultrasonic treatment, freeze drying and the like, so that the high purity of the aloe gel powder and the retention of active components are ensured. In addition, the invention further provides a preparation process of airflow mixing granulation filling, nitrogen or carbon dioxide is used as mixed gas, and uniformity and stability of capsule components are guaranteed. The aloe capsule prepared by the method has the characteristics of definite components, remarkable effect, easiness in absorption and the like, and is suitable for people who need to improve intestinal health and enhance the antioxidant capacity of organisms.

The utility model discloses a traditional Chinese medicine purification separator which comprises a supporting leg I, a shell and a supporting leg II, the number of the first supporting legs is four, the top ends of the four first supporting legs are fixedly connected with the lower surface of a heating barrel, an electric heating wire is arranged in an interlayer of the inner wall of the heating barrel, and an inclined table is arranged on the bottom wall of the heating barrel; the shell is fixedly connected to the top end of the heating barrel, a stirring mechanism is arranged in the shell, and the bottom end of the stirring mechanism extends into the heating barrel; the top ends of the four second supporting legs are fixedly connected with the lower surface of a cooling barrel, a discharging hopper is arranged at the bottom end of the cooling barrel, a condensation pipe is arranged in an interlayer of the inner wall of the cooling barrel, and a connecting pipe is installed between a connecting opening in the middle of the upper surface of the cooling barrel and a connecting opening in the right end of the upper surface of the heating barrel through a flange. According to the traditional Chinese medicine purification separator, traditional Chinese medicine materials and solvents can be fully mixed, substance transfer between the traditional Chinese medicine materials and the solvents is accelerated, and the extraction quality and purity are improved.

The present invention discloses a novel skeleton diterpene alkaloid compound and a preparation method and application thereof, wherein the novel skeleton cleaved ring C 20 The diterpene alkaloid compound Carmiseconapline A showed significant antidepressant activity in the mouse behavioral despair model experiment, which was significantly better than the positive drug fluoxetine and can be used to develop antidepressant drugs.

The invention discloses a bergamot pear polygalacturonase inhibitory protein extraction and purification method, which comprises: 1, crushing bergamot pears to obtain crushed bergamot pears; 2, precipitating the filtered crushed material by using an ammonium sulfate solution; 3, dissolving the precipitate with a buffer solution, and performing dialysis and primary purification to obtain a crude extract; and 4, purifying the crude extract by using a gel filtration chromatography column to obtain a purified extract, and drying to obtain the traditional Chinese medicine composition. The natural bergamot pear fruits are used as raw materials, and the method does not depend on chemical synthesis or genetic engineering technology, and accords with green, environment-friendly and sustainable development concepts; the extraction and purification process comprises multi-step purification processes such as filtration, precipitation, dissolution, dialysis and filter membrane filtration, and conventional laboratory technologies such as filter paper filtration, centrifugation and dialysis are used, so that the whole process is easy to implement and repeat, the feasibility and the reliability of experiments are improved, and the cost is reduced. The purity, the biological activity and the extraction rate of the extract are remarkably improved.

The utility model discloses a novel smashing device which comprises a smashing box, a base is welded to the bottom of the smashing box, a feeding hopper is arranged at the top of the smashing box, the bottom of the feeding hopper is communicated with a stock bin arranged at the top of the smashing box, a material distributing round bin is arranged at the bottom of the stock bin in a communicated mode, and a smashing round bin is arranged at the bottom of the material distributing round bin. A communicating groove is formed in the center of the top of the round smashing bin and communicates with the bottom of the round distributing bin, an arc-shaped bottom bin plate is arranged in the center of the bottom of the round smashing bin, and moving chambers are arranged at the left end and the right end of the round smashing bin. The curcumin extraction device is simple in structure and convenient to operate, can uniformly and efficiently crush the curcumin material, improves the extraction efficiency and purity of curcumin, and can realize automatic control of the whole crushing and collecting process by controlling the motor and the electric telescopic rod through the controller.

The application relates to the technical field of archaea DNA extraction, in particular to a preparation method and application of auxiliary wall-breaking nanometer magnetic beads for archaea DNA extraction. The method comprises the following steps: (1) constructing an inverse emulsion droplet microfluidic chip: washing, drying and hydrophobic modification treatment are performed on a PDMS base material to prepare a microfluidic chip; (2) preparing an inverse microemulsion system: the continuous phase and the dispersed phase are respectively pumped into the microfluidic chip at a predetermined flow rate, so that Fe 2+ and Fe 3+ undergo a coprecipitation reaction to generate Fe3O4 nanoparticles; (3) maturation crystallization; (4) demulsification separation and washing; and (5) drying to obtain auxiliary wall-breaking nanometer magnetic beads. The method has the beneficial effect of solving the problems in the prior art that the cell wall is difficult to effectively break, the DNA release rate is low, the extraction purity is poor, the repeatability is insufficient and the standardization and continuous preparation are difficult to realize when DNA extraction is performed on archaea samples in extreme environments.

This invention discloses a method for extracting target products from dairy raw materials, relating to the field of food processing technology. Before strong anion exchange chromatography, this method introduces a synergistic pretreatment step of ultrafiltration and conductivity adjustment, achieving "speed increase, efficiency enhancement, quality improvement, and cost reduction" in the chromatography process. It overcomes the technical bottlenecks of traditional ion exchange chromatography in processing dairy raw materials, such as slow speed, susceptibility to contamination, and instability, providing a solution for the efficient, high-purity, and large-scale production of β-lactoglobulin and α-lactalbumin. This method can also combine strong and weak anion exchange chromatography to further improve the extraction purity of β-lactoglobulin and α-lactalbumin. Furthermore, this method can simultaneously achieve efficient extraction of multiple target substances such as casein micelles, lactose, and milk mineral salts, thereby significantly increasing the added value and resource utilization efficiency of dairy by-products.

This invention belongs to the field of chemical analysis and relates to the extraction of 6,7-dihydroxy-2,4-dimethoxyphenanthrene, specifically a method for extracting high-purity 6,7-dihydroxy-2,4-dimethoxyphenanthrene. This invention, by improving extraction efficiency, simplifying purification steps, increasing product purity, and reducing preparation costs, helps promote the application development and market application of this compound, and also contributes to the sustainable development of related industries. This invention fully utilizes the abundant resources of yam and its by-products, turning waste yam by-products into valuable resources. This not only extends the yam industry chain and increases added value, but also makes full use of resources, resulting in significant economic and social benefits. This invention also has significant advantages in improving separation efficiency, reducing environmental pollution, simplifying operations, increasing yield, and fully utilizing resources, and is expected to be widely applied and promoted in the field of yam compound extraction.

This utility model discloses a lithium extraction system for salt lakes, comprising a magnesium removal module, a boron removal module, and a lithium ion precipitation module connected in sequence. The magnesium removal module includes an ion exchange resin magnesium removal device, a nanofiltration membrane magnesium removal device, and a deep reverse osmosis membrane magnesium removal device connected in sequence, with the permeate outlet of the deep reverse osmosis membrane magnesium removal device connected to the inlet of the boron removal module. The boron removal module includes a nanofiltration boron removal device and a reverse osmosis boron removal device connected in sequence, with the permeate outlet of the reverse osmosis boron removal device connected to the inlet of the lithium ion precipitation module. The lithium ion precipitation module includes an ion exchange resin lithium adsorption device, a MVR device, and a lithium precipitation device connected in sequence. The MVR device further includes an evaporation recovery device, with a portion of the permeate from the MVR device entering the lithium precipitation device through the evaporation recovery device, and the other portion directly entering the lithium precipitation device.

This invention relates to the field of sludge treatment technology, and more particularly to a method for preparing struvite by acid leaching of phosphorus from sludge gasification residue with kaolinite assistance. The method includes the following steps: S1, calcining a mixture of kaolinite and sludge in a certain proportion at 800-1000℃ for a period of time; S2, dissolving the calcined product with an acid solution, separating the solid and liquid, and collecting the phosphorus-containing supernatant; S3, adding a certain amount of magnesium and ammonium sources to the phosphorus-containing supernatant, adjusting the pH to 9.4-10, stirring for a period of time, separating the solid and liquid, washing the filtered solid with deionized water, and drying to obtain struvite crystals. This invention introduces kaolinite before sludge calcination, increasing the phosphorus content in the calcined product, improving the utilization rate of sludge gasification residue, and solidifying heavy metals in the sludge. It avoids a large amount of heavy metals entering the phosphorus-containing supernatant during acid leaching, resulting in a stable and reliable MAP struvite material.

The invention relates to the technical field of sparkling wine, and particularly discloses a sparkling wine preparation method based on radix ophiopogonis active ingredient solid alcohol, which comprises the steps of radix ophiopogonis active ingredient extraction, solid alcohol preparation, sparkling wine compound blending, sterilization and packaging. By matching with centrifugal filtration, rotary evaporation concentration and freeze drying processes, the extraction efficiency and purity of active ingredients such as saponin and polysaccharide in the radix ophiopogonis are remarkably improved, the problem of insufficient release of the active ingredients caused by traditional normal-temperature soaking is avoided, and the solid alcohol matrix can be used for flexibly regulating sweetness, acidity and flavor auxiliary materials; the dwarf lilyturf tuber sparkling wine has the advantages that the strong taste of the traditional highly-soaked wine is obviously improved, the dwarf lilyturf tuber sparkling wine is more in line with the preference of modern consumers on light-alcohol and easy-to-drink drinks, has the natural health-care property of dwarf lilyturf tuber and the relaxed and pleasant feeling of sparkling wine, meets the consumption requirements of the current market on low-alcohol and functional drinks, and expands the application scene of the traditional medicinal and edible materials.

This invention discloses a method for preparing purslane exosomes with anti-allergic effects and their applications, specifically relating to the field of natural active substances. The method includes washing fresh purslane and then juicing or homogenizing it, separating solid residue from the liquid juice to obtain a plant homogenate supernatant as a precursor. The precursor is then subjected to low-temperature differential centrifugation to remove cell debris and large particulate impurities, and the clarified supernatant is collected. The clarified supernatant is then filtered through one or more multi-stage filter membranes, with pore sizes selected from 5 μm, 1.2 μm, 0.45 μm, 0.22 μm, and 100 nm. Through optimized extraction processes, such as specific enzymatic hydrolysis steps, centrifugation conditions, and ultrafiltration technology, the extraction efficiency and purity of exosome-like nanovesicles are significantly improved. Compared to traditional extraction methods, this method can more accurately remove impurities, preserve the integrity and bioactivity of exosome-like nanovesicles, and ensure their stability and effectiveness in subsequent applications.

The present invention relates to the technical field of egg processing and utilization, and in particular to a method for extracting active substances containing eggshell membranes, comprising: step S1, mixing eggshells with water and performing temperature pretreatment to achieve preliminary eggshell membrane separation; step S2, heating and stirring to achieve secondary separation of the eggshell membranes, and adjusting the stirring speed and / or stirring time according to the residual degree of the eggshell membranes and eggshells; step S3, adjusting the pH value after heating the eggshell membranes and water, adding keratinase and stirring to obtain an enzymolysis solution. The preset amount of enzyme / enzymolysis time / enzymolysis temperature is adjusted according to the product generation rate characterization value, and the adjustment cycle of the pH value of the enzymolysis solution is determined according to the product generation rate characterization value or the pH value of the enzymolysis solution; step S4, high-temperature enzyme inactivation, filtration, and nanofiltration of the enzymolysis solution to obtain a nanofiltration concentrate; step S5, high-temperature sterilization of the nanofiltration concentrate and drying to obtain the eggshell membrane active substances. The present invention improves the extraction rate of eggshell membranes, and improves the extraction purity and yield of eggshell membrane active substances.

This invention relates to the field of nuclear radiation monitoring technology, specifically a remote online tritium monitoring system, comprising: a data acquisition module for synchronously acquiring end-point tritium concentration, pipeline environmental parameters, and background radiation data; a coupling model construction module for constructing a coupled model of gas-solid interface adsorption kinetics and fluid transport, and establishing a dynamic transfer function; a source term inversion and reconstruction module for performing deconvolution operations to inversely deduce the true tritium concentration at the source; a state assessment and threshold adjustment module for real-time calculation of pipeline adsorption saturation and dynamic adjustment of alarm thresholds; an early warning generation module for generating early leak warning commands; and an operation and maintenance prediction module for identifying pipeline maintenance needs based on the trend of adsorption performance degradation. This invention overcomes the defects of signal lag and peak clipping, achieving a second-level response to sudden pulse leaks.

The invention discloses a biopesticide composition as well as a preparation method and application thereof, and the biopesticide composition comprises the following components in parts by weight: 10-30 parts of xyveratrane diterpenes; and 10 to 50 parts of a flavonoid compound. According to the present invention, the resveratrol diterpenes extracted from the pieris formosa or the vaccinium bracteatum thunb and the flavonoid compounds are adopted as the active components, are mixed according to the specific ratio, and are compounded with the specific auxiliary components so as to provide a certain synergistic effect, such that the pesticide composition has significant insecticidal and antibacterial effects, can be directly sprayed on crops, and further has characteristics of environmental protection and environmental protection. And plant diseases caused by pests and pathogenic bacteria can be effectively prevented and treated.

This invention relates to the field of agricultural microbiology, and discloses a highly effective fungal agent for controlling ginger stem base rot and its preparation method. The agent includes *Trichoderma harzianum* (accession number CCTCC NO:M 20253070), which is first inoculated onto potato dextrose agar to obtain plates covered with fresh spores. Then, wheat bran and soybean meal are mixed to adjust the initial moisture content and initial pH to prepare a solid fermentation substrate. A diluted spore suspension is uniformly inoculated into the substrate for fermentation to obtain a fermentation product. The fermentation product is mixed with an extract and shaken, then filtered through sterile gauze to obtain a crude spore solution, which is finally diluted to obtain the final product. This invention achieves control by using *Trichoderma harzianum* to antagonize the pathogen and disrupt its cell structure. The use of wheat bran and soybean meal to construct a microenvironment with a high carbon-to-nitrogen ratio yields a fermentation product with high spore production. The combination of extract elution and gauze filtration to intercept residues and prepare a crude spore solution improves the purity of the fungal agent.

The utility model belongs to the technical field of extraction tank, concretely is a kind of spice extraction tank, including tank body, extraction mechanism and deslagging mechanism, the extraction mechanism is arranged in the inside of the tank body, the deslagging mechanism is arranged in the inside of the tank body and is connected with the extraction mechanism;The extraction mechanism includes the separation cylinder fixedly connected in the inside of the tank body, the inside of the separation cylinder is equipped with filter cylinder, the top of the tank body is fixedly connected with first motor, the output of first motor is connected with the rotating shaft extending to the inside of the tank body, the outside of the rotating shaft is fixedly connected with several groups of stirring piece.This spice extraction tank, by first helical shaft vertical transfer slag to second helical shaft, realize efficient deslagging, first helical shaft is connected with rotating shaft by magnetic coupling, rely on electromagnetic control to realize flexible start-stop, when deslagging, magnetic coupling drives first helical shaft to rotate by the driving force of first motor, and slag material is smoothly discharged from tank body.

The utility model discloses a kind of three-stage preheating simulation devices of hydrometallurgy of nickel, including simulation room, heating assembly, power supply assembly and temperature control assembly, first reaction kettle, second reaction kettle and third reaction kettle are respectively provided in the simulation room, the heating assembly includes first heating pipe, second heating pipe and third heating pipe, the first heating pipe is fixedly arranged in the both sides of first reaction kettle, the second heating pipe is fixedly arranged in the top and bottom of second reaction kettle, the third heating pipe is arranged around in the circumferential side of third reaction kettle, the first heating pipe, second heating pipe and third heating pipe are all connected power supply assembly, the first reaction kettle, second reaction kettle and third reaction kettle outside are all provided with temperature control assembly, three reaction kettles and corresponding heating pipe set, the preheating temperature of different stages can be accurately controlled, so as to meet the different temperature needs in hydrometallurgy of nickel process.