730results about How to "Promote leaching" patented technology

The invention relates to a saline-sodic land reclamation and control method. Wide and deep research is long developed on the reclamation of saline-sodic land at home and abroad, and more focuses on engineering measures than applies biological techniques; although achievement has been made, some insurmountable difficulties still exist. The saline-sodic land reclamation and control method comprises the following steps: bulk deep loosening, applying soil deep loosening agents and saline-sodic soil improvement agents to deep loosening soil, purposefully and proportionally applying biologically organic fertilizer according to the composition of soil detected by adopting a nutrient balance method and a nitrogen phosphorus and potassium proportioning method which both comprise the following steps: subtracting soil nutrient-supplying amount from the fertilizer requirement of target yield, supplementing the balance through fertilizing, hathpace ridge forming, draining water and controlling salt, planting green manure-saline alkali tolerant high-yielding grass crop jerusalem artichoke to thoroughly improve the soil.

The invention provides a production method of fructus monordicae extract with over 60% of mogroside V content. In the method, the fresh momordica grosvenori is subjected to the following technique processes: smashing, saccharification, extraction by water, concentration, sedimentation and centrifugation, ion exchange resin refining, macroporous resin refining, concentration, aluminum oxide refining, concentration, spray drying and finishing product. The method can produce high-quality fructus monordicae extract products, reduce material loss, shorten period of production, increase product yield, lower production cost, and is suitable for industrial production. The mogroside V content in the fructus monordicae extract produced by the method is more than or equal to 60%; the fructus monordicae extract has high product purity, single composition, pure white color, good color and taste, fresh and cool sweet taste like that of sugar, simultaneously overcomes the technical problem for industrial production of the high-content and high-quality fructus monordicae extract, and successfully realizes large-scale production.

In one aspect, a vacuum-sealed can is used during the bonding process to improve the properties of an infiltrated TSP cutting element. In one embodiment, ultra hard diamond crystals and a catalyst material are sintered to form a polycrystalline diamond material (PCD). This PCD material is leached to remove the catalyst, forming a thermally stable product (TSP). The TSP material and a substrate are placed into an enclosure such as a can assembly, heated, and subjected to a vacuum in order to remove gas, moisture and other residuals that can inhibit infiltration of the infiltrant into the TSP layer. The can assembly is then subjected to high temperature, high pressure bonding to bond the TSP material to the substrate. During bonding, material from the substrate infiltrates the TSP layer.

The invention provides a production method for extracting sweet tea glucoside from sweet tea leaves. The method comprises the following process flows of: smashing a sweet tea crude drug; extracting a solvent; concentrating; precipitating with alcohol; purifying with macroporous resin; concentrating; carrying out chromatography with polyamide resin; concentrating; crystallizing and recrystallizing; drying; and obtaining a finished product. By using the method, a high-quality sweet tea glucoside product can be produced, and the method also has the advantages of reducing the material loss, shortening the production period, improving the product yield and reducing the production cost and is suitable for the industrial production; the purity of the sweet tea glucoside produced by utilizing the method is higher than 98 percent, so that the product purity is high, and the component is single; the color of the sweet tea glucoside is white and good; and meanwhile, the technical difficulty of industrially producing a high-content and high-quality sweet tea glucoside extractive is overcome, so that large-scale production is smoothly produced.

The invention provides a method for preparing a titanium pigment by adopting a novel direct reduction flow. A novel raw material is provided for the production of a titanium pigment with a sulfuric acid process, and a process flow is provided for downstream utilization of a direct reduction product of vanadium titano-magnetite simultaneously. A novel hydrochloric acid pretreatment process with a novel direct reduction flow for titanium residues is adopted, so that dyeing elements such as aluminum, calcium, magnesium, iron, chromium, vanadium and the like in the titanium residues in the novel process are removed effectively, pretreated titanium-rich hydrochloric acid leaching residues are directly applied to production of a titanium pigment with a sulfuric acid process, the conventional refrigeration iron removing and concentration purifying processes are not required, special aluminum, chromium and vanadium processes are not required, ferrous sulfate is not produced, and ammonia alum waste as well as chromium, vanadium and ferrous sulfide residues which are difficult to treat are not produced. Moreover, the used hydrochloric acid and sulfuric acid are completely recycled in an enclosed loop, and a diluted waste acid liquid is not produced.

The invention discloses a preparation method for a tea extract, belonging to the technical field of extraction of effective components of tea leaves. The preparation method comprises the following steps: firstly, carrying out low-temperature rapid freezing treatment on high-quality commercial tea leaves; then immediately crushing; then combining a high-voltage pulsed electric field (PEF for short) technology, an ultrasonic treatment technology and a low-temperature enzymolysis technology; and carrying out low-temperature extraction in a whole process. According to the preparation method for the tea extract, the loss of effective components, caused by high-temperature processing, is avoided, and the extraction rate of the effective components of the tea leaves is also improved. The process is simple and low in cost; the introduction amount of extraneous food additives, processing auxiliary agents and chemical substances is reduced; the natural nutritional ingredient and the flavor of the tea leaves are kept to the greatest extent, the low-carbon production is realized and the environment is protected.

The invention discloses a method for extracting citrus pericarp essential oil, which comprises the following steps: selecting fresh citrus pericarps, removing the white pericarp layer until the pericarp thickness is 0.1-0.2cm, mincing, repeatedly freezing and thawing for 2-5 times, preparing a compound enzyme from pectinase and cellulose at a mass ratio of (1-6):1, preparing an enzyme solution, mixing the pretreated citrus pericarp particles with the compound enzyme solution, and performing enzymolysis in a dark place for 5-30min; and performing condensation and reflux extraction of the hydrolyzed citrus pericarps with n-hexane, and removing n-hexane to obtain essential oil. The method disclosed by the invention adopts a physical process of repeated freezing and thawing to conduct initialbreak of cell walls of citrus pericarps, and then performs enzymolysis of the citrus pericarps with the compound enzyme, so as to greatly increase the extraction rate of citrus pericarp essential oil. The method also has the following advantages: the extraction process is simple, the natural fragrance is less damaged, and the use value of the citrus processing byproduct - citrus pericarps - can be utilized to a maximum extent. The essential oil extracted using the method disclosed by the invention has pure texture and has the natural fragrance of citrus fruits.

The invention discloses a moderate thermophilic enriched substance used for mineral leaching of copper pyrites, comprising five mineral leaching microorganisms: acidithiobacillus caldus S2, leptospirillum ferriphilum YSK, sulfobacillus acidophilus ZW-1, sulfobacillus thermosulfidooxidans YN22 and ferroplasma thermophilum L1; the pH value and the temperature which are most suitable for the growth of the enriched substance are respectively 1.4-2.0 and 45-48 DEG C. Compared with the existing microorganisms used for brass bio-heap leaching, the enriched substance not only improves the leaching reaction kinetics and shortens the leaching period, but also reduces the passivation inhibition phenomenon and increases the bioleaching speed and the leaching rate of the copper pyrites; furthermore, the enriched substance can endure high concentration metallic ion at the late stage of bioleaching.

The invention discloses a method for continuously leaching sulfide ore by using the synergy of autotrophic ore leaching bacteria and heterotrophic ore leaching bacteria, which comprises two main steps of preparing a compound ore leaching strain and leaching ore by using the compound strain. The step of preparing the compound ore leaching strain comprises the steps of selecting a strain, preparing a culture medium, compositely culturing the strain and domesticating the compound ore leaching strain. The step of leaching ore by using the compound strain comprises the steps of pretreating an ore sample, preparing an ore leaching culture medium, leaching the ore by using the compound ore leaching strain, selecting and adding semiconductor sulfide ore and extracting metals in the leaching liquids. In the method, the characteristic of the semiconductor sulfide ore to provide electrons to promote the ore leaching action of microbes in the electron transition process is utilized, so that the operating cost of the whole process is lowered, the ore leaching efficiency of the process is improved, and the method has broad application prospect in the field of metallurgy.

The invention discloses a treatment method for a rare earth phosphate rock and an enrichment method for rare earth. The treatment method comprises the following steps: mixing the rare earth phosphate rock and phosphoric acid to form mixed slurry; adding concentrated sulfuric acid into the mixed slurry in such a manner that the concentration of Ca<2+> in the mixed slurry is decreased from at least 1 wt% to the equilibrium concentration of Ca<2+> and SO4<2->, then the concentration of SO4<2-> in the mixed slurry is increased from the equilibrium concentration of Ca<2+> and SO4<2-> to at least 2 wt% and the mixed slurry is added during addition of the concentrated sulfuric acid to allow the rare earth phosphate rock to be dissolved so as to obtain hemihydrate gypsum; and subjecting the obtained hemihydrate gypsum to recrystallization to obtain dihydrate gypsum. The enrichment method for rare earth comprises a step of recovering rare earth elements from liquid obtained after recrystallization of the hemihydrate gypsum and / or liquid obtained after heating of the mixed slurry. In the process of generation of the hemihydrate gypsum, the addition speed of the concentrated sulfuric acid is controlled, and SO4<2-> in the mixed slurry is allowed to be insufficient at first and then controlled to be excess, which aids rare earth in entering into the phosphoric acid.

This invention relates to wet process of recovering zinc from leach slag containing zinc. It belongs to a wet process for zinc ore, in particular to a process for slag containing zinc produced from the systerm of wet zinc metallurgy. This method comprises the following steps: washing residue with water or diluted acid to get slag, selecting P204 as extractant and coal oil as thinner to extract them to water phase, configuring the solution containing zinc and sulfuric acid, eluting the impurity loaded in organic phase, back extracting the load organic phase with depleted electrolyte and sulfuric acid, transferring zinc in organic phase to water phase, deoiling all water phases which contact with organic phase, finally, taking the liquid which has been back extracted as fresh liquid, and adding it into zinc electrodeposition systerm. The invention has high metal recovery ratio, and can recovery zinc from leach slag containing zinc, save resource, avoid environmental contamination. And it perfectly joins with the process of wet processing of zinc oxide ore, decreases the consumption of acid in the leaching of zinc oxide, and reduces the cost.

The invention relates to a method for preparing active polysaccharide, flavone and dietary fiber in a united manner by taking peanut hulls as raw materials, belonging to the technical field of natural product extraction and comprising the following steps of:carrying out ultrasonic treatment, enzymolysis and filtration on pretreated peanut hull powder by taking water as an extracting agent to obtain filtered liquor and filtered slag; extracting the filtered liquor with an organic solvent after concentrating, and recovering the organic solvent in an extraction phase to obtain a crude flavone product of the peanut hulls; carrying out alcohol precipitation on a raffinate phase to obtain crude polysaccharide of the peanut hulls; and decoloring the filtered slag, cleaning and drying to obtain adietary fiber product of the peanut hulls. The method is simple in process route, and three valuable products such as the polysaccharide, the flavone and the dietary fiber of the peanut hulls are prepared by utilizing the same batch of raw materials, so that the loss of other functional ingredients is avoided when a single product is prepared.

The invention discloses a method for recovering copper and cadmium from copper and cadmium slag and a device for recovering cadmium from a zinc sulfate solution rich in cadmium. The method comprises the following steps of firstly mixing copper and cadmium slag with a gas carrier substance uniformly; then using a sulfuric acid solution to carry out acid leaching on the copper and cadmium slag under certain conditions to leach all copper, cadmium and zinc in the copper and cadmium slag into the solution; then adopting zinc powder as a reducing agent to preferably reduce copper ions in the acid leachate into elemental copper to be precipitated under certain conditions, and adopting the device for recovering cadmium from a zinc sulfate solution rich in cadmium to selectively extract cadmium from the obtained zinc sulfate solution rich in cadmium, thus obtaining a high-grade sponge cadmium and zinc sulfate solution, wherein sponge cadmium can be directly subjected to casting-electrorefining or rectifying to obtain high-purity cadmium, and the zinc sulfate solution can be directly returned to an electrolytic zinc system to produce electrolytic zinc.

An extracting and concentrating process for Chinese medicine includes such steps as loading raw Chinese-medicinal materials in extractor adding solvent, steam heating to obtain liquid, boiling evaporating in vacuum state, condensing the secondary vapour to obtain liquid, switching it to the liquid distributor of extractor, spraying it on the surface of Chinese-medicinal materials, and repeating said steps for extracting while concentrating. Its apparatus is composed of extractor, condenser, vacuum switching device, heater and evaporator. Its advantages are simple and compact structure, simple process, high extraction rate, less loss and low secondary pollution.

An apparatus for extracting active components from raw Chinese-medicinal material features that the first circulating loop is composed of extractor, pipeline, condenser and oil-liquid separator and the second circulating loop is composed of said first one, pipeline and circulating pump. Its process includes such steps as loading the raw Chinese-medicinal material in basket, putting it in extractor, filling solvent, heating by steam, extracting cyclically, condensing the aromatic oil vapor, oil-water separating, and reusing the separated solvent.

The invention relates to a method for recovering metal materials in waste ternary power batteries, and belongs to the technical field of battery material recovery and cyclic utilization. The method comprises the steps that positive and negative electrode mixed powder, phosphoric acid solution and the like react with each other, filtering is conducted to obtain a first solution; a potassium permanganate solution is added into the first solution for recovering manganese dioxide, a second solution is obtained, a butanone oxime solution is added into the second solution, butanone oxime nickel precipitation and a third solution are obtained, butanone oxime nickel is dissolved in hydrochloric acid, separating is conducted to obtain a fourth solution, and the fourth solution is subjected to electrodeposition to recover metal nickel; then mixed extractant is used for extracting cobalt ions in the third solution, separating is conducted to obtain an organic phase and a fifth solution, cobalt inthe organic phase is extracted by using sulfuric acid, a sixth solution is obtained, and the sixth solution is subjected to electrodeposition to recover metal cobalt; and a sodium carbonate solutionis added to the fifth solution, and lithium carbonate is recovered. The method for recovering the metal materials in the waste ternary power batteries adopts a mild and stable phosphoric acid-sodium bisulfite system; the multiple purification methods of precipitation, extraction and electrodeposition are used without interference to each other, and the separation effect is good; and the recoveredproducts have many types, and application is wide.

The invention relates to a method for removing heavy metal from sludge. The method comprises the following steps of: extracting the heavy metal by using citric acid and hydrogen peroxide, performing microwave heating and solid-liquid separation, and adding sodium hydroxide to precipitate the heavy metal. The method is simple in process, the removal rate of the heavy metal is high, and consumption of acid is low; the citric acid solution can be recycled; the method is low in cost and does not harm the environment; and by adding the hydrogen peroxide into the extract, the extraction rate is improved, the reaction is quickened, and loss of available chemical elements such as N and P is reduced.

The invention discloses a process for brewing high-degree aromatic grape spirit, which mainly comprises the steps of: juice and slag separation, skin and slag as well as juice fermentation, distillation, blending and the like. Compared with the prior art, in the process of the invention, grape pips in grapes are firstly removed and grape juice and a certain amount of grape pip-removed grape skin are mixed and fermented, a high-acidity and low-temperature fermentation process is adopted, thus the obtained grape spirit has quality characteristics of the grappa and the flavor of the high-qualitypure-grain white wind; the indexes of the total acid and the total ester are far higher than that of the grappa and slightly lower than that of the white wine, and the total quantity of ethyl acetateand ethyl lactate accounts for above 90 percent of the total ester quantity.

The present invention discloses a pomegranate fermented lactic acid drink. The pomegranate fermented lactic acid drink is made from the following raw materials: pomegranates, skim milk, pomegranate peels, pomegranate flowers, pomegranate barks, pomegranate leaves, sophora japonica leaves, calyx kaki, picrasma quassioides, isomaltitol, gentiooligosaccharide, lactic acid bacteria, compound enzymes, and antioxidants of bamboo leaves. The drink is sour and sweet in mouthfeel, moderate in concentration, stable in state, and rich in nutrition, can promote metabolism, enhance immunity, dispel toxins and beautify feature, and prevent oxidation, aging, and tumors. The pomegranates are rich in organic selenium, help absorption and utilization, and promote the body function; each of the organs of the pomegranate is fully used and scientifically matched with other traditional Chinese medicines, the effects are complementary to each other, the raw materials are extensive, the price is low and cheap, and the costs are saved; a first lactic acid bacterium high-temperature fermentation is conducted, the lactic acid bacterium growth is promoted, and the pollution is avoided, at a second time, the gentiooligosaccharide is added, the activities of the lactic acid bacteria are enhanced, and a low-temperature long-time fermentation is conducted, which is conductive to the produce of flavor substances; and the fermented lactic acid drink is filled, and the filled lactic acid drink is subjected to low-temperature cold storage, which can maintain the activities of the lactic acid bacteria in the drink, so that the pomegranate fermented lactic acid drink promotes gastrointestinal functions.

The invention discloses a method for producing cathode nickel by the selective leaching-electrodeposition of high nickel matte, which relates to a method for producing the cathode nickel by hydrometallurgical refining of the high nickel matte. The method is characterized in that the cathode nickel production process comprises the following steps of: (1) performing first-stage normal-pressure leaching on the high nickel matte; (2) removing cobalt from first-stage normal-pressure leachate for purification and producing electric nickel by electrodeposition; (3) adding a sulphur fixing agent into a first-stage leaching residue to perform second-stage pressing and sulphur fixing leaching, and returning the leachate which is obtained by the second-stage pressing and sulphur fixing leaching to perform first-stage normal-pressure leaching; and (4) desulfurating and roasting the leaching residue obtained by the second-stage pressing and sulphur fixing leaching to obtain a roasted product, and returning the roasted product which is used as the sulphur fixing agent in the step (3). The method of the invention effectively solves the problem of acid excess of a production system, has a high nickel recovery rate and low production cost, is highly adapted to different high nickel matte raw materials and favorable for environmental protection, and can obviously reduce the waste water emission in the production.

The invention discloses a saline-alkali soil modified microbial inoculum and a preparation method thereof. The microbial inoculum comprises, by weight, 10-30 parts of bacillus megatherium HB bacteriapowder, 35-65 parts of phosphorus tailings powder, 12-18 parts of phosphogypsum, 8-25 parts of sugar refinery wastes, 6-26 parts of seaweed residue and 1-8 parts of mannitol. Components of the saline-alkali soil modified microbial inoculum have synergistic interactions with each other to enhance effects, if any one of the components lacks, expected effects cannot be reached, and only when the saline-alkali soil modified microbial inoculum with whole formulas is adopted and 30-80 kg of the microbial inoculum is used per mu, can the effects of increasing fertilizer utilization rate and crop yields, and improving quality and saline-alkali lands be achieved.

The invention discloses a method for extracting vanadium from a vanadium-containing raw material. The method comprises the following steps: a, uniformly mixing the vanadium-containing raw material, sulfuric acid and / or a sulfate, and water, so as to obtain a mixed material; b, performing aerobic roasting on the mixed material, so as to obtain a roasted clinker; c, performing leaching on the roasted clinker by using a leaching agent, so as to obtain a leaching slurry; and d, performing filtration separation on the leaching slurry, so as to obtain tails and a vanadium-containing solution. The method has relatively strong adaptability on composition variation of the vanadium-containing raw material, and helps to realize economic feasible industrial production and extraction of vanadium by using steel slag, vanadium slag and other vanadium-containing raw materials with relatively high calcium and magnesium content. The method is simple, practicable, low in equipment requirement, convenient to operate, low in material consumption and energy consumption, and easy for industrialization, and has extremely good economic benefit and social benefit.

The invention discloses a health-care juice wine for enhancing body immunity. The health-care juice wine is prepared from a wine base and auxiliary materials, wherein the wine base is a distilled spirit of which the alcoholic strength is 30-38 degrees; the dosage of the distilled spirit accounts for 10 times of the weight of the auxiliary materials; the auxiliary materials comprise the following raw materials in parts by weight: 10-30 parts of Chinese wolfberry seedling, 10-30 parts of Chinese wolfberry fruit, 5-30 parts of wine siberian solomonseal rhizome, 7-40 parts of hawthorn fruit, 3-20 parts of fragrant solomonseal rhizome, 10-30 parts of common yam rhizome, 10-30 parts of momordica grosvenori, 2-20 parts of Indian buead, 1.5-15 parts of fried gardenia and 0.5-5 parts of honey-fried licorice root. The preparation method comprises the steps of replacing an acidulant by using the hawthorn fruit, replacing a coloring agent by using siberian solomonseal rhizome, gardenia and momordica grosvenori, and replacing a sweetening agent by using momordica grosvenori; dividing the auxiliary materials into two parts by using the distilled spirit of 30-38 degrees, and leaching; blending two parts of leaching liquor, placing in a room at 10-35 DEG C, aging for 2-3 months, and then filtering and clarifying. By adopting the health-care juice wine disclosed by the invention, the problems that the auxiliary materials are low in effective component extraction rate and high in ineffective component extraction rate in the prior art can be solved; the waste of resources can be reduced, and the production cost can be reduced; a product does not contain any chemical composition pigments, essences and additives, so that the health-care juice wine has the effects of nourishing the five internal organs, invigorating the spleen and supplementing qi, and enhancing the body immunity.

The invention provides a processing technique for producing condiment oil with fresh peppers and tea oil, belonging to the field of edible oil. The processing technique comprises the steps of pepper selecting, washing, dewatering, edible oil selecting, heating, soaking, filtering, centrifuging, storing and the like. The invention aims to provide the processing technique for preparing the health-care condiment oil which is wholesome, nutritional and safe and has unique flavor by taking the tea oil as a solvent to extract the active ingredients such as the pepper-flavored and fragrant substances of the fresh peppers.

The invention belongs to the field of waste battery resource recycling, and discloses a leaching system and leaching method for valuable metal in a waste lithium battery. According to the leaching method, a sulfamic acid-glucose leaching agent is pre-heated, positive electrode powder is added, and stirring and leaching in a reaction kettle are performed, Co (III) and Mn (IV) are reduced to Co (II)and Mn (II) which are dissolved in a leaching liquid with Li<+> and Ni<2+>, Li, Co, Ni and Mn leaching rate in the waste battery positive electrode powder can reach 95% or above, and recycling or reusing of Li, Co, Ni and Mn can be achieved after further processing the leaching liquid. Compared with a traditional leaching liquid, the leaching system has the advantages of greenness, environmentalfriendliness, safe and controllable leaching process and relatively good industrial application prospect.

The invention provides a kumquat tea and its preparation method. The kumquat tea is prepared through cleaning, kumquat pretreatment, pulp removal, first roasting, tea filling, second roasting, and naturally air-drying. The kumquat tea comprises a kumquat shell and tea leaf located in a container; the kumquat shell comprises a kumquat main body and a kumquat cover body; air holes are arranged on the kumquat main body and the kumquat cover body; after fully filling tea in the kumquat tea container, the kumquat cover body is buckled in an opening of the kumquat main body by means of the kumquat elasticity, so that the kumquat cover body is located on the tea leaf. The kumquat tea is featured by good air permeability, easy dryness, long tea expiration date, uneasily-leaked tea leaf in the process of brewing and aromatic flavor.

The invention discloses a method and device for immobilizing CO2 in industrial tail gas by enhancing mineral carbonation. The device comprises a packed column absorber, a mineral leaching tank, a carbonation reactor and a belt type filter. The method comprises the steps of: enabling the industrial tail gas containing CO2 to enter the packed column absorber filled with immobilization carbonic anhydrase, rapidly transforming the CO2 into HCO3<-> under the catalysis action of the carbonic anhydrase; with a weak acidic solution containing the HCO3<-> as a mineral leaching agent, effectively leaching calcium ions from minerals in the mineral leaching tank under the action of ultrasonic waves to form a slurry enriching Ca<2+>; introducing the slurry enriching Ca<2+> into the carbonation reactor, adding a calcium-containing alkali material, regulating the pH of the slurry to be 7-9 to ensure that the HCO3<-> is transformed into CO3<2->, and generating a carbonation reaction with the Ca<2+> leached from the minerals to generate CaCO3. The invention can promote the CO2 to be rapidly transformed into the HCO3<->, can promote the calcium ions to be leached from the minerals and the carbonation reaction, and further realizes that the CO2 in the industrial tail gas is immobilized through direct carbonation under normal pressure.

The invention discloses a method for recovering molybdenum from waste catalyst containing molybdenum. The method mainly comprises the following steps of: carrying out pretreatment to the waste catalyst containing molybdenum, leaching the molybdenum into the solution, and purifying and recovering the molybdenum from the solution; wherein, the pretreatment carried out to the waste catalyst containing molybdenum is as follows: the crushed waste catalyst containing molybdenum, alkaline matters and magnesium oxide are mixed fully by proper proportion, and then high temperature roasting treatment is carried out. The treatment method has simple operation, low cost, little pollution, little hazard, low requirements on equipment and easy industrialization; and the adding proportion of the alkaline matters and magnesium oxide is proper, thus being capable of absorbing harmful substances released when the waste catalyst is roasted; in addition, the adding of the proper magnesium oxide can lead the waste catalyst to keep loose state, avoids the phenomenon that the waste catalyst containing oil is roasted directly to lead partial temperature to be overhigh, which then causes the sublimation of the molybdenum and further causes the recovery rate to be reduced, thus improving the recovery rate of the molybdenum.

The invention discloses a method for separating and recycling valuable metal in tungsten slag. The method can be used for recycling artificial scheelite, electronic-grade cobalt chloride, silver sponges, copper sponges, nickel carbonate and low-grade tantalum-niobium ore from the polymetallic tungsten slag. The method comprises the steps that the tungsten slag is subjected to ball milling in a wet mode to obtain fine powder slurry; tungsten is separated and recycled through an ozone alkali leaching method; nickel, cobalt and copper are separated and recycled through a hydrochloric acid leaching method; silver is recycled through a hydrochloric acid complexing leaching method; a leaching agent obtained in the hydrochloric acid leaching procedure is subjected to deironing and calcium-magnesium removal through fluoride in a sodium jarosite method to obtain pre-extraction liquid, the pre-extraction liquid is subjected to P204 extraction, copper, manganese and zinc are separated through deep purification, and the electronic-grade cobalt chloride is obtained by separating nickel and cobalt from sodium ions through P507 extraction. By the adoption of the ozone alkali leaching technology, by-products only produce O2 and H2O, no harmful effect is generated on the environment, tungsten, cobalt, copper, nickel, silver, tantalum and niobium can be separated efficiently, the recovery rate is high, and the comprehensive recycling effect is good; moreover, energy consumption is low, and the method is environmentally friendly, simple, easy to implement and suitable for industrial production.