60results about How to "Reduce mass ratio" patented technology

An apparatus for pre-processing and subsequent plastification or agglomeration of synthetic plastic materials, in particular thermoplastic waste plastics for recycling purposes, has a receptacle (1) in which at least one comminuting tool (6) circulates. The housing (7) of a screw (8) is connected to the receptacle (1). The diameter (D) of the receptacle (1) has the following relationship to the screw diameter (d):D=10.{square root over (K.d2)}, wherein D is the inner diameter of the receptacle in mm,d is the screw diameter in mm andK is a dimension-less constant which amounts to at least 190.Thereby the dwell times of the synthetic plastic material within the receptacle (1) are kept at optimal values.

The invention discloses a technological method for extracting zinc, in particular to a technological method for extracting zinc by roasting blast furnace gas mud by virtue of a rotary kiln, belonging to the technical field of metallurgy production. By applying the technological method provided by the invention, zinc oxide in the gas mud can be thoroughly reduced, and the production cost is low. The technological method comprises the following steps of: a) burdening, namely adding coke powder with the mass ratio of 16-20% into the gas mud and mixing to be uniform; b) checking, namely carrying out a sampling test on the calorific value of mixture of the gas mud and the coke powder which are uniformly mixed, wherein the acceptable calorific value is 1600-2000 kcal / kg; c) roasting and reducing, namely directly sending the qualified mixture of the gas mud and the coke powder into a kiln body of the rotary kiln to be roasted and reduced, thus zinc oxide particles and metallized slag are generated; and d) collecting, namely collecting the zinc oxide particles at the tail of the kiln and discharging residual metallized slag from the head of the kiln.

The invention provides a system taking compressed air as a force applying source. The system comprises a compressed air jet engine (14) which takes high-pressure and ultrahigh-pressure compressed air as a jet working medium, a compressed air production and supply device (48) for greatly producing, storing and supplying high-pressure and ultrahigh-pressure compressed air in an economic and environment-friendly manner and a controller, wherein the compressed air jet engine (14) is arranged on aviation, aerospace and navigation equipment such as airplanes, rockets, submarines, trains and the like as well as moving carriers which travel on the ground; the compressed air jet engine (14) comprises an air tank (9) used for storing the compressed air and a jet engine (16) used for generating power; the jet engine (16) comprises a primary jet engine (14) for generating thrust and a plurality of secondary jet engines for reducing air (or seawater) resistance as well as air (or seawater) sliding friction force generated in travelling of the moving carriers, so as to be beneficial for increasing the speed and saving energy, as well as increasing lifting force of wings of the airplane, so as to be beneficial for short-distance or vertical take-off, landing and the like of the airplane.

The invention discloses a circumferential combustion-increasing structure on the outer end surface of the charge of a missile solid motor, including a charge column, a cladding sleeve and a liner. The grain is bonded to the covering sleeve through the lining layer, and the initial combustion surface of the grain can be changed by adjusting the length of the covering sleeve, so that the engine can meet the overall engine initial thrust index requirements. Compared with the prior art, the present invention adopts the hoop-increasing structure, and its advantages and beneficial effects are: the hoop-increasing structure is easy to measure and detect, and at the same time, it eliminates the stress concentration and cracks of the grain caused by the complex profile , so that the risk of engine operation is reduced; the initial burning surface of the grain can be effectively adjusted without losing the amount of medicine, so that the initial thrust of the engine can be increased, thereby ensuring the mass ratio of the engine.

The invention discloses an additive for aquatic feed. The additive comprises 3-10 parts of one or more plant essential oils, 1-5 parts of propylgallate, 10-30 parts of diatomite, 5-20 parts of white carbon black and 20-40 parts of corncob powder, wherein the plant essential oils comprise oregano essential oil, nutmeg essential oil, agastache essential oil, sage essential oil, mint essential oil and thyme essential oil. The additive has the very strong capability to resist common aquatic bacteria, can relieve the damage to fish organs caused by bacterial infection, and can further improve the feed conversion rate for aquatic animals and facilitate the growth properties of the aquatic animals; moreover, the additive has the advantages that the stability is high, the environment is protected from pollution, and no drug resistance is generated.

The invention discloses a method for separating mesitylene via extractive distillation, wherein an extractive distillation solvent adopted in the method is one of N-methyl-2-pyrrolidone and 2-pyrrolidone, and preferably is N-methyl-2-pyrrolidone. The method disclosed by the invention has the advantages of being relatively simple in separation process, low in operating energy consumption, and high in product yield. The extractive distillation solvent adopted in the method is high in separation efficiency for mesitylene and o-methyl-ethylbenzene, so that the separation process can be realized on an extractive distillation tower with few tower plates; and moreover, the solvent is easy to recover and good in chemical thermostability.

The invention discloses a novel hawthorn fruit pit removing and fruit slicing device and application of the hawthorn fruit pit removing and fruit slicing device, and belongs to the technical field of food processing mechanical equipment manufacturing. The novel hawthorn fruit pit removing and fruit slicing device comprises chain wheels, a transmission shaft, a transmission device, chains, an object carrying device, a surface slicing device, a machine frame, a crank sliding block device, a pit removal device, a pit removal sifting mesh, and finished product and waste delivery devices; the novel hawthorn fruit pit removing and fruit slicing device is compact in structure and convenient to operate; the device has a complete whole process of hawthorn fruit pit removing and fruit slicing, the efficiency in pit removing and fruit slicing is high, the operation is simple, the demand for manpower is small, and the yield of the product is sharply increased at the same time while pit removal is guaranteed; through a principle of a crank sliding block mechanism, the rotation input by a transmission system achieves the linear reciprocating movement through a crank connecting rod mechanism, so that a power input sliding block passes the energy of an engine to the crank sliding block mechanism; it is guaranteed that the knife blade has a certain velocity, and the damage caused when the knife blade is too slow can be avoided at the same time.

The invention provides a dual-frequency resonance driving vibration absorber small in mass and low in power consumption. The dual-frequency resonance driving vibration absorber comprises a sinusoidal signal generator and a two-degree-of-freedom electromagnetic vibration absorber, wherein the sinusoidal signal generator transmits sinusoidal signals corresponding to a current motor rotation speed frequency to the two-degree-of-freedom electromagnetic vibration absorber. The two-degree-of-freedom electromagnetic vibration absorber comprises a lower spring, a lower mass block, exciting coils, coil retainers, a middle spring, an upper mass block, an upper spring, a shaft and a support mechanism. The shaft is arranged in the support mechanism, the lower spring, the lower mass block, the middle spring, the upper mass block and the upper spring are sequentially sleeved on the shaft from the bottom to top and capable of vertically moving along the shaft, the coil retainers are fixedly connected to a bottom plate of the support mechanism and surround outside lower magnetism-permeable yokes, the exciting coils are wound on the coil retainers and arranged in a magnetic loop formed by the lower mass block and are connected with the sinusoidal signal generator. The dual-frequency resonance driving vibration absorber is capable of effectively suppressing structural vibration caused by a motor under the variable working conditions of a dual-speed motor.

A method for making reduced iron using blast-furnace sludge is provided. The method includes a mixing step of mixing the blast-furnace sludge and an iron-oxide-containing powder to prepare a mixed material, an agglomerating step of agglomerating the mixed material to form agglomerates, a feeding step of feeding the agglomerates onto a continuously moving hearth, and a reducing step of heating the agglomerates to remove zinc and reduce the agglomerates.

The present invention provides a system of using compressed air as force source, comprising: compressed air jet engines, which use high / ultra-high pressure compressed air as a jet working medium, a compressed air production / supply device to economically, environmentally and quantitatively produce, store and supply the high / ultra-high pressure compressed air, and a controller. The compressed air jet engines are equipped on an airplane, rocket, submarine, train, or other moving carrier for aviation, aerospace, navigation and / or ground travel, comprising an air tank and air engines for generating power. The air engines comprise a main air engine for generating thrust, and a plurality of auxiliary air engines for reducing the air (or seawater) resistance and the sliding friction with air (or seawater) during the carrier movement to facilitate the speed-rising and energy-saving, and for improving the lift force of airplane wings to facilitate airplane short-range or vertical take-off / landing, etc.

The invention relates to chicken feed for increasing immune organ indexes. The chicken feed comprises a feed main ingredient, wherein the feed main ingredient comprises the following components: dry corn, 43% soybean meal, bran, DDGS, corn protein power, flour, north sea fish meal, a mildew preventive and a chicken feed 511E. A traditional Chinese medicine additive comprises the following raw materials: white hyacinth bean, changium smyrnioides, radix isatidis, white atractylodes rhizome, white paeony root, coriolus versicolor and radix glycyrrhizae. The chicken feed for increasing the immune organ indexes, provided by the invention, is reasonable in formula, high in palatability, capable of being quickly digested and absorbed, effectively improving the immunity of chicken, improving the daily gain mass, lowering the mass ratio and remarkably lowering the mortality and elimination rate.

The invention discloses an extraction system for extracting lithium and boron by separating calcium from calcium-containing brine by a secondary amid / alkyl alcohol composite solvent, an extraction method and application of the extraction method. In the extraction system, secondary amid and alkyl alcohol serve as extracting agents for extracting lithium and boron correspondingly and consist of single compound or a mixture of more than two compounds; the total number of carbon atoms in the molecules is 12 to 18 and 8 to 20 correspondingly, and the freezing point of the extraction system is lessthan 0 DEG C. Single-stage or multi-stage countercurrent extraction is conducted under the conditions that the volume ratio of an organic phase to a brine phase is (1-10):1, the density of the brine is 1.30 to 1.56 g / cm<3>, the pH value of the brine is 0 to 7 and the temperature is 0 to 50 DEG C, an aqueous phase with low calcium-lithium ratio is obtained through back extraction, and lithium chloride, lithium carbonate, lithium hydroxide and boric acid are obtained respectively through concentration, impurity removal and preparation. The secondary amide is simple in molecular structure, and the lithium and the boron can be extracted simultaneously by the composite solvent improved by the alkyl alcohol; multi-stage extraction rate is high, back extraction is conducted by using water and acid and alkali consumption is greatly reduced; and the extraction separation flow is shortened, and the extraction system has small solution loss and is suitable for development of oilfield brine.

The invention discloses an extraction system and method for separating magnesium and extracting lithium from magnesium containing brine with a secondary amide / tertiary amide complex solvent and application of the extraction method. The extraction system contains secondary amide and tertiary amide, and each of the secondary amide and the tertiary amide is composed of a single compound or a mixtureof two or more compounds. The total number of carbon atoms in a molecule of the secondary amide ranges from 12 to 18, the total number of carbon atoms in a molecule of the tertiary amide ranges from 18 to 32, and the solidifying point of the extraction system is lower than 0 DEG C. Single-stage or multi-stage counter-current extraction is carried out under the condition that the volume ratio of anorganic phase to a brine phase is (1-10):1, the density of the brine is 1.25-1.38 g / cm<3>, and the temperature ranges from 0 DEG C to 50 DEG C; and a water phase low in magnesium-lithium ratio is obtained through reextraction, and lithium chloride, lithium carbonate and lithium hydroxide products are obtained through concentration, purification and preparation. The extraction system and method for separating magnesium and extracting lithium from the magnesium containing brine with the secondary amide / tertiary amide composite solvent and the application of the extraction method have the excellent effects that a secondary amide extraction agent is simple in molecular structure and easy to produce, and the viscosity and other physical characters of the complex solvent are improved through the tertiary amide; the multi-stage extraction rate of Li+ is high, the magnesium-lithium separation coefficient is large, water is used for reextraction, and acid-base consumption is greatly reduced; and the extraction separation technological process is short, the extraction system is small in dissolution loss, and high industrial application value is achieved.

The invention discloses a graphite paper negative electrode, a graphite paper current collector and a preparation method thereof, and belongs to the field of lithium ion material manufacturing. The graphite paper current collector comprises a first surface and a second surface which are oppositely arranged; wherein the second surface is a surface acting with the active substance, the first surfaceis used for being connected with an external circuit, a plurality of holes are formed in the second surface, and the plurality of holes do not penetrate through the first surface. In addition, the invention also provides a preparation method of the current collector and a graphite paper negative electrode. The lithium ion battery half-cell assembled by the current collector provided by the invention has excellent cycling stability, also has good rate capability, and has excellent charging and discharging performance under large current. Compared with a copper foil and aluminum foil current collector used at present, under the condition of the same capacity, the mass of the whole electrode is greatly reduced, and the mass specific capacity can be improved by 100-200%.

The invention discloses a method for preparing a paint raw material from a paint waste residue, and the method comprises the following steps of: preprocessing the paint waste residue, classifying, removing impurities, then adding an additive and a protecting agent, and uniformly dispersing; sending the preprocessed paint waste residue to an organic waste recycling system, setting a proper temperature and then carrying out separation modification; recycling solid components to form thick plaster-shaped modified resin and packaging; collecting mixed steam of a solvent and water through gas and then condensing so as to separate gas from liquid, carrying out tail gas purification on the gas part and discharging the gas part when the gas part reaches the standard, carrying out oil-water separation on the liquid part to ensure that water is separated from the solvent, collecting the solvent for concentrated utilization, and carrying out wastewater treatment on the water and then discharging when the gas part reaches the standard. A large quantity of organic solvent is not adopted in the method, water can be well separated from the paint waste residue, and the prepared paint raw material has the advantages of lower organic solvent content, lower danger and the like, thus the paint raw material can be safely used in various medium- and low-end coating raw materials.

The invention discloses a glass tube of a novel high-efficiency energy-saving lamp, comprising the following components in percentage by mass: 67.2-67.5 percent of SiO2, 10.3-10.9 percent of Na2O, 5.6-6 percent of PbO, 5.1-5.3 percent of K2O, 3.9-4.1 percent of BaO, 2-2.3 percent of B2O3, 2.1-2.3 percent of Al2O3, 3.1-3.4 percent of CaO and 0.2-0.5 percent of MgO. When used, the invention greatly reduces lead content in a lamp tube and dust precipitation quantity of red lead at the same time and lightens environmental pollution.

The invention relates to a nickel cobalt lithium manganate battery positive electrode active material, an aluminum housing battery core and a manufacturing method thereof. The positive electrode active material is nickel cobalt lithium manganate, and the molar ratio of nickel cobalt manganese in the nickel cobalt lithium manganate is 1: 1: 1 or 5: 2: 3 or 6: 2: 2 or 8: 1; the aluminum housing battery core comprises a positive electrode, a negative electrode, a diaphragm, an electrolyte and an aluminum housing body; the positive electrode comprises a positive electrode active material, a binder, a conductive agent and a positive electrode current collector; the negative electrode comprises a negative electrode active material, a negative electrode binder, a negative electrode conductive agent and a negative electrode current collector; and the battery core adopts a multi-tab winding structure formed by connecting the diaphragm, the positive electrode, the diaphragm and the negative electrode; and the positive electrode active material is lithium manganate or lithium nickel cobalt manganate or a mixture of lithium manganate and lithium nickel cobalt manganate. The prepared battery core has the advantages of good low-temperature performance, good rate capability and good cycle performance.

The invention relates to a chicken feed capable of reducing the death rate of chicken. The chicken feed comprises a feed main material, wherein the feed main material is prepared from the following components: dried corns, 43% soybean meal, bran, DDGS, corn protein flour, poultry feed flour, Beihai fish meal, a mildew preventive and a chicken feed 511E; and a traditional Chinese medicine additive is prepared from the following raw materials: fructus amomi, herba dendrobii, eclipta prostrata, bighead atractylodes rhizome, astragalus membranaceus, trametes versicolor and liquorice roots. The chicken feed capable of reducing the death rate of the chicken provided by the invention is reasonable in formula, high in palatability and rapid to digest and absorb; the immunity of the chicken can be effectively improved; and meanwhile, the daily increasing mass is improved, the feed-mass ratio is reduced and the death and culling rate is remarkably reduced.

The present invention discloses a method for producing lithium carbonate from a low-lithium brine by separating magnesium and enriching lithium. A salt-lake brine is used as a raw material and is converted into halide salts through dehydration by evaporation and separation by crystallization; the halide salts are directly extracted using trialkyl phosphate or a mixture of trialkyl phosphate and monohydric alcohol, and an organic extraction phase as well as remaining halide salts are obtained after solid-liquid separation; reverse extraction is performed on the organic extraction phase to obtain a lithium-rich solution with a low magnesium-to-lithium ratio, and lithium carbonate is obtained after concentration and removal of magnesium by alkalization. The used solid-liquid extraction method is simple with no co-extraction agent used, and a solute distribution driving force is strong, unaffected by phase equilibrium of the brine extraction agent. The mass ratio of magnesium-to-lithium significantly decreases in the extraction phase.

The invention discloses a method for preparing tungsten alloys with different components through same-furnace sintering. The method comprises the following steps of: 1, selecting fine tungsten powderand fine nickel powder, adding ultrafine iron powder, and carrying out mixing to obtain an activated high-tungsten mixture; 2, selecting coarse tungsten powder and nickel powder, adding iron powder, and carrying out mixing to obtain a passivated low-tungsten mixture; 3, obtaining an activated high-tungsten compact and a passivated low-tungsten compact by adopting cold isostatic pressing forming separately; and 4, carrying out same-furnace sintering on the activated high-tungsten compact and the passivated low-tungsten compact to obtain a high-tungsten alloy and a low-tungsten alloy separately.By selecting and designing the raw material components and contents of the high-tungsten alloy and the low-tungsten alloy, the sintering temperature of the activated high-tungsten mixture is reduced,and the sintering temperature of the passivated low-tungsten mixture is increased, so that the sintering temperature and the heat preservation time of the high-tungsten alloy and the low-tungsten alloy tend to be the same, the purpose of same-furnace sintering is achieved, the sintering periods of the tungsten alloys with different components are shortened, the production efficiency is improved,sintering conversion is not needed, and energy waste caused by sintering conversion is avoided.

The invention provides a system taking compressed air as a force applying source. The system comprises a compressed air jet engine (14) which takes high-pressure and ultrahigh-pressure compressed air as a jet working medium, a compressed air production and supply device (48) for greatly producing, storing and supplying high-pressure and ultrahigh-pressure compressed air in an economic and environment-friendly manner and a controller, wherein the compressed air jet engine (14) is arranged on aviation, aerospace and navigation equipment such as airplanes, rockets, submarines, trains and the like as well as moving carriers which travel on the ground; the compressed air jet engine (14) comprises an air tank (9) used for storing the compressed air and a jet engine (16) used for generating power; the jet engine (16) comprises a primary jet engine (14) for generating thrust and a plurality of secondary jet engines for reducing air (or seawater) resistance as well as air (or seawater) sliding friction force generated in travelling of the moving carriers, so as to be beneficial for increasing the speed and saving energy, as well as increasing lifting force of wings of the airplane, so as to be beneficial for short-distance or vertical take-off, landing and the like of the airplane.

The invention provides a lithium ion battery negative electrode current collector and a preparation method thereof. The lithium ion battery negative electrode current collector comprises a polyimide film and copper layers coating two sides of the polyimide film. The polyimide copper-plated film has high flexibility and low density of polyimide and high conductivity of copper at the same time, so that the mass ratio of inactive components in the current collector can be effectively reduced, and the rough surface appearance of the polyimide copper-plated film can also improve interface electron transmission; the reduced contact resistance of the current collector and the electrode layer is reduced, so that the electrode taking the polyimide copper-plated film as the current collector can show higher specific discharge capacity, better rate capability and cycling stability. Moreover, the invention also provides a preparation method of the lithium ion battery negative electrode current collector, two thin copper layers are coated on two sides of the polyimide film through chemical plating, and the preparation method has the advantages of low cost, simple equipment and wide application range.

The invention discloses an extraction system and an extraction method for extracting lithium from magnesium-containing brine by using a secondary amide / alkyl ester complex solvent, and application thereof. The extraction system contains secondary amide and alkyl ester which are respectively prepared from a single compound or a mixture of more than two compounds; in the molecules, the totals of carbon atoms are respectively 12 to 18 and 8 to 20; and the freezing point of the extraction system is smaller than 0 DEG C. The extraction method comprises the steps of carrying out single-stage or multi-stage counter-current extraction under the conditions that the volume ratio of an organic phase and a brine phase is 1 to 10:1, the brine density is 1.25 to 1.38g / cm<3> and the temperature is 0 to 50 DEG C, carrying out back-extraction to obtain a low-magnesium-lithium-ratio water phase, and obtaining lithium chloride, lithium carbonate and lithium hydroxide products through concentration, purification and preparation. The extraction system and the extraction method for extracting the lithium from the magnesium-containing brine by using the secondary amide / alkyl ester complex solvent, and the application thereof provided by the invention have the excellent effects that a secondary amide extraction agent is simple in molecular structure and easy to produce, the physical properties such asviscosity of the complex solvent is improved through alkyl ester, the Li+ multistage extraction rate is high, the lithium-magnesium separation coefficient is large, and the acid-alkali consumption isgreatly reduced due to back-extraction by water; and the extraction separation process flow is short, and the extraction system is low in solution loss and has a favorable industrial application value.

The invention discloses an extraction system and an extraction method for separating magnesium and extracting lithium from magnesium-containing brine with a secondary amide / alkyl ketone complex solvent and application of the extraction method. The extraction system contains secondary amide and alkyl ketone each of which consists of a single compound or more than two mixtures; the total number of carbon atoms in a molecule of the secondary amide and the total number of carbon atoms in a molecule of the alkyl ketone are 12-18 and 8-12 respectively; and the solidifying point of the extraction system is lower than 0 DEG C. Single-stage or multistage counter-current extraction and back extraction are performed under the conditions that the volume ratio of an organic phase to a brine phase is (1-10) : 1, the density of the brine is 1.25-1.38 g / cm<3> and the temperature is 0-50 DEG C to obtain an aqueous phase low in magnesium and lithium ratio, and concentration, impurity removal and preparation are performed to obtain a lithium chloride product, a lithium carbonate product and a lithium hydrate product. The extraction system and the extraction method have the excellent effects a secondary amide extraction agent is simple in molecular structure and easy to produce, and the alkyl ketone improves physical properties, such as the viscosity of the complex solvent, and the like; the multistage extraction rate of Li<+> is high; the magnesium and lithium separation coefficient is big; back extraction is performed with water, so that acid and alkali consumption is greatly reduced; the extraction and separation process flow is short; the extraction system has small solvent loss; and the extraction system and the extraction method have high industrial application value.

The invention discloses a high-meat-quality breeding method for white-feather chickens. The white-feather chickens are divided into four stages of the 0-7-day-old stage, the 8-21-day-old stage, the 22-34-day-old stage and the 35-42-day-old stage, growth stages are reasonably divided by taking 42-day-old slaughter broilers as a standard, and meanwhile, appropriate breeding density, breeding temperature, feeding frequency and feeding formula are used in cooperation, so that the physical quality and disease resistance of the white-feather chickens are improved, the daily gain of the white-feather chickens is improved, meanwhile, the feed-to-mass ratio is reduced, and the death and culling rate is remarkably reduced.

The invention provides an electrode plate for an electric double layer capacitor and a preparation method of the electric double layer capacitor. The preparation method of the electrode plate comprises the following steps: preparing activated carbon fiber cloth; compounding conducting high molecular polymer with the activated carbon fiber cloth to prepare an activated carbon fiber cloth / conducting high molecular polymer combined electrode, wherein the conducting high molecular polymer is poly(3,4-ethylenedioxythiophene), polyaniline or polypyrrole; washing the combined electrode in de-ionizedwater to remove excess foreign ions on the combined electrode; and drying the combined electrode the foreign ions of which are removed to prepare the electrode plate. The invention increases the bonding area of the conducting high molecular polymer and activated carbon fibers, enhances the contact performance among the activated carbon fibers and between the activated carbon fiber cloth and a collector electrode, reduces the mass ratio of the conducting high molecular polymer to the combined electrode, increases the energy density of the electric double layer capacitor and greatly lowers the equipment requirement and manufacturing cost.

The invention discloses an extraction system, an extraction method and an application thereof for separating calcium and extracting lithium from calcium-containing brine by using a secondary amide / alkyl ketone composite solvent. The extraction system contains secondary amides and alkyl ketones which are composed of a single compound or a mixture of two or more, the total number of carbon atoms in the molecule is 12-18 and 8-12 respectively, and the freezing point of the extraction system is less than 0°C. The volume ratio of the organic phase to the brine phase is 1-10:1, and the brine density is 1.30-1.56g / cm 3 , brine with a pH value of 1 to 7 and a temperature of 0 to 50°C for single-stage or multi-stage countercurrent extraction, back extraction to obtain a low-calcium-lithium ratio water phase, after concentration, impurity removal and preparation, lithium chloride, lithium carbonate and lithium hydroxide. Excellent effect of the present invention: secondary amide extractant molecular structure is simple, is easy to produce, and alkyl ketone improves properties such as the viscosity of composite solvent; Li + The multi-stage extraction rate is high, the lithium-calcium separation coefficient is large, and the acid-base consumption of water back extraction is small; the extraction and separation process is short, and the extraction system has little dissolution loss, which is suitable for the development of oilfield brine.

The invention relates to the technical field of solution separation and purification, in particular to a method for separating and enriching lithium. The method comprises the following steps: pretreatment: diluting and filtering the old brine from Yantian to obtain pretreated brine; separation: separating the pretreated brine through a nanofiltration separation system to obtain nanofiltration fresh water and nanofiltration concentrated water; The first concentration: the nanofiltration fresh water is concentrated for the first time through the reverse osmosis system to obtain the reverse osmosis concentrate and the reverse osmosis fresh water; the second concentration: the reverse osmosis concentrate is concentrated for the second time through the electrodialysis system to obtain Electrodialysis concentrated water and electrodialysis fresh water, electrodialysis concentrated water is a solution rich in lithium ions. The present invention utilizes the advantages of different membrane separation technologies and couples several different membrane separation technologies to achieve the purpose of improving the separation efficiency of magnesium and lithium, and improving the efficiency of lithium enrichment, and the enriched lithium ions can achieve the preparation of high-purity The concentration of lithium ions required for lithium salts.