214 results about "Lepidolite" patented technology

The invention relates to a method for efficiently extracting lithium by roasting lepidolite at low temperature by using composite organic acid. The invention relates to a method for efficiently extracting lithium by roasting lepidolite at low temperature by using composite organic acid, which comprises the following steps of: adding an activating agent into lepidolite concentrate, and pre-activating to obtain activated lepidolite concentrate powder; the lepidolite concentrate powder and a composite organic acid roasting agent are mixed, acidified and roasted, and a roasted product is obtained; adding water into the roasted product for leaching, and carrying out suction filtration to obtain a lithium-containing leachate; the composite organic acid roasting agent at least comprises methanesulfonic acid. According to the method, the problem that the lithium ion extraction efficiency is low due to the fact that the TOT layered structure in the lepidolite is difficult to damage is solved, and the problem that the lithium ion extraction efficiency is low due to the fact that Si-O bonds with high bond energy in an existing lepidolite crystal framework are difficult to dissociate is also solved.

The invention discloses a method for extracting lithium by coupling roasting of lepidolite and spodumene, and belongs to the technical field of metal smelting, the method comprises the following steps: calcining a mixture to obtain a roasted material, and then leaching the roasted material to obtain a lithium-containing solution and slag; the mixture comprises mixed stone and a roasting aid, and the mixed stone comprises lepidolite and spodumene. According to the method, the lepidolite and the spodumene are subjected to coupled calcination, and the reaction activity of the lithium element is improved through fluorine in the lepidolite, so that the roasting temperature and the doping amount of a roasting auxiliary agent required by phase transformation of the lepidolite and the spodumene are reduced, and the energy consumption and the generation of slag in the lithium extraction process are further reduced.

The invention provides a high-selectivity flotation method for micro-fine particle lepidolite containing rubidium and cesium, which comprises the following steps: levigating raw lepidolite ore, and desliming to obtain a flotation material and slime; adding sodium hexametaphosphate and a collecting agent HT8-01 into the flotation material, stirring, and roughing to obtain lepidolite rough concentrate and flotation tailings I; a collecting agent HT8-01 is added into the flotation tailings I for two times of scavenging, flotation tailings and two scavenging middlings are obtained, and the scavenging middlings are sequentially returned to the upper layer for operation; sodium hexametaphosphate is added into the lepidolite rough concentrate for two times of concentration, lepidolite concentrate and two concentrated middlings are obtained, and the concentrated middlings are sequentially returned to the upper layer for operation; the collecting agent HT8-01 is obtained by mixing octadecylamine and sodium dioctyl sulfosuccinate according to the mass ratio of 5: 3. According to the method, the separation effect of the rubidium-cesium-lithium-containing mica and gangue minerals such as quartz and feldspar is improved, the problems that foam is too stable, the viscosity is too high and the size is too large are solved, and high-selectivity separation of the micro-fine-particle rubidium-cesium-lithium-containing mica is achieved.

The invention belongs to the technical field of lithium-containing mineral treatment, and relates to a method for selectively extracting lithium from lepidolite. The method mainly comprises the following steps: carrying out roasting defluorination treatment on lepidolite, and grinding to obtain a lepidolite defluorination roasting material in which the mass content of lithium is 0.8-1.5% and the mass content of aluminum is 20-30%; carrying out acid leaching treatment on the lepidolite defluorination roasting material by using a first acid solution, and carrying out solid-liquid separation to obtain a leaching solution and leaching residues; adjusting the pH value of the leachate to 2-3 by adopting a neutralizer, and then adding a mixture of the neutralizer and benzoic acid into the leachate to obtain aluminum benzoate precipitate and aluminum-removed liquid; adding the aluminum benzoate precipitate into a second acid solution, dissolving, and carrying out solid-liquid separation to obtain regenerated benzoic acid and an aluminum-rich solution; and cooling the aluminum-rich solution to obtain an aluminum salt and a recyclable acid solution. According to the method, efficient separation of lithium and aluminum in lepidolite can be achieved, benzoic acid and the acid solution can be recycled, and the lithium extraction cost can be effectively reduced.

The application discloses a kind of multi-element combination collector and its application in low-grade lepidolite flotation, belong to mineral processing technical field.The multi-element combination collector provided by the application is composed of cationic amine collector, anionic promoter and long-chain anionic collector, which significantly improves the reaction activity of the collector and the capture behavior of the mineral particles during the flotation process, reduces the foam viscosity and increases the fluidity, effectively solves the problem of overstable foam and the difficulty of flotation separation of different silicate minerals under acidic conditions, reduces environmental pollution and equipment corrosion, and also strengthens the hydrophobic floating behavior of lepidolite surface, resulting in high grade Li2O concentrate, further realizing the clean recycling of low-grade lepidolite resources.

The invention discloses a method for strengthening flotation recovery of micro-fine particle rubidium and cesium co-associated lepidolite. The method mainly comprises the following steps: blending the micro-fine particle rubidium and cesium co-associated lepidolite into ore pulp by using micro-nano bubble deionized water; sequentially adding a regulating agent and an anion-cation combined collecting agent, fully stirring, and regulating the pH value of the ore pulp; and a flotation machine is used for sorting the evenly-stirred ore pulp, and rubidium and cesium co-associated lepidolite concentrate is obtained. According to the flotation result, on the premise that the using amount of the collecting agent is the same, the recovery rate of the cavitation micro-nano bubble flotation is increased compared with that of conventional bubble flotation, and the flotation recovery rate of the micro-fine particle rubidium-cesium co-associated lepidolite which is an important metal mineral resource can be remarkably increased through the method; and efficient recovery of the rubidium-cesium carrier minerals is effectively realized.

The application discloses a low-grade lepidolite flotation combined collector and application thereof, and belongs to the technical field of mineral processing. The lepidolite flotation combined collector SDI-101 of the application is composed of a cationic collector and an anionic collector, and includes the following raw materials in mass fraction: 20%-80% of an amine collector and 20-80% of an amino carboxylic acid collector. The combined collector is used to cooperatively improve the flotation efficiency of the low-grade lepidolite ore. In the case that the Li2O grade of the lepidolite raw ore is lower than 0.5%, a lepidolite concentrate with a Li2O grade of about 2% and a recovery rate of more than 80% can be obtained through a 'one-roughing-one-cleaning-one-scavenging' flotation process. The lepidolite combined collector of the application is applicable to the low-grade lepidolite ore, and the raw ore does not need desliming treatment. The lepidolite combined collector of the application has the advantages of strong collecting property and adaptability, can effectively improve the grade and recovery rate of the lepidolite concentrate, and promotes the efficient use of lepidolite resources.

The invention relates to a method for deeply removing beryllium and thallium from lepidolite smelting slag and obtained purified lithium slag, and the method comprises the following steps: (1) mixing the lepidolite smelting slag with water to obtain mixed slurry; (2) adding an acid solution into the mixed slurry obtained in the step (1) until the pH value is 3-3.5, then adding a complexing agent, uniformly mixing, leaching, and carrying out first solid-liquid separation to obtain a beryllium and thallium-containing leachate and lithium slag; and (3) sequentially adding a precipitator and an adsorbent into the beryllium and thallium-containing leaching solution obtained in the step (2), and carrying out second solid-liquid separation to obtain a purified leaching solution and beryllium and thallium-containing waste residues. The method is easy and convenient to operate, high in reaction rate and stable in beryllium and thallium removal effect, low-cost, efficient and deep removal of beryllium and thallium toxic components in the lepidolite smelting slag is achieved, and the lithium slag obtained after deep removal of beryllium and thallium can be directly applied to the large-scale absorption field of building materials, roadbed materials and the like.

The invention provides a lepidolite flotation wastewater treatment device and a flotation process, and relates to the technical field of wastewater treatment, the lepidolite flotation wastewater treatment device comprises an oxidation reaction tank, a multi-point feeding mechanism and a swing mechanism; the multi-point feeding mechanism comprises a mounting plate, a liquid outlet pipe and a two-way threaded screw rod, the two sides of the mounting plate are fixedly connected with the inner wall of the oxidation reaction tank, a sliding rail is fixedly arranged at the top of the mounting plate, and a moving seat is slidably connected to the surface of the sliding rail. According to the scheme, when the amidoxime lepidolite-containing flotation wastewater is treated, ferrous sulfate and hydrogen peroxide are added into the flotation wastewater, so that oximido and amino of amidoxime are destroyed, complexed heavy metals are released, macromolecular organic matters are degraded, the heavy metals are ensured to be completely free, and the heavy metals in effluent are prevented from exceeding the standard; in addition, the hydrogen peroxide is gradually added in a multi-point mode, bumping caused by local over-concentration is avoided, inner side spraying is adopted during spraying, and bumping of the liquid level due to the fact that the hydrogen peroxide is directly sprayed downwards and settles to the bottom of the pool under the action of gravity is avoided.

The invention discloses a lightweight lithium mineral microscopic image real-time detection and instance segmentation method, and belongs to the technical field of computer vision and image segmentation, and the method comprises the steps: constructing a sample data set; wherein the sample data set comprises lithium mineral microscopic images and corresponding segmentation labels; the YOLO11-seg segmentation model is improved, and the improved YOLO11-seg segmentation model is obtained; the sample data set is used to train the improved YOLO11-seg segmentation model; and the trained and improved YOLO11-seg segmentation model is utilized to realize lithium mineral microscopic image real-time detection and instance segmentation. The model provided by the invention can be deployed in resource-constrained equipment and embedded equipment, and can realize accurate detection and segmentation of main components (lepidolite, quartz and feldspar components) in lithium ore.

The invention discloses a technological method and system for extracting lithium from lepidolite through fluidized roasting and water leaching, and belongs to the technical field of treatment methods of lithium-containing minerals. The method comprises the following steps: S1, mixing lepidolite mineral powder with a sulfate auxiliary agent to prepare a roasted raw material, adding a fluorine fixing auxiliary agent, and mixing to prepare a mixture; s2, the mixture and fluidizing gas are subjected to preheating treatment; s3, the preheated mixture and fluidizing gas are fed into a fluidized bed roasting furnace to be subjected to a fluidized roasting reaction, and roasting clinker, a fluorine fixing auxiliary and thallium-containing tail gas are obtained through separation; s4, the thallium-containing tail gas is subjected to cyclone preheating and wet defluorination and reacts with metal sulfide, a gaseous thallium compound is removed, and solid thallium sulfide is prepared; and S5, cooling the roasted clinker, performing water leaching, filtering, neutralizing and precipitating lithium, so as to obtain lithium carbonate and leaching residues. The method is more environmentally friendly and efficient, the lithium smelting slag amount can be remarkably reduced, and fluorine recycling is achieved.

The present application is to provide a harmless treatment method for removing thallium and beryllium from lithium residue, which overcomes the above-mentioned difficulties. The method uses waste lithium residue after lithium extraction from lepidolite as the main raw material, adopts a combination of ball milling machinery and chemical treatment with chemical reagents, further grinds and crushes the waste lithium residue, increases the surface area of the waste lithium residue to make the subsequent stabilization reaction more thorough, releases the soluble salts of potassium, sodium, beryllium and thallium wrapped by the waste lithium residue, and makes them dissolve into water during washing. At the same time, the mechanical ball milling can convert a part of insoluble lithium into soluble lithium to increase the recovery rate of metallic lithium. Through water washing and spray washing, harmful elements such as beryllium and thallium in the waste lithium residue are removed, so that the treated lithium residue meets the standards for beryllium and thallium. The content of beryllium and thallium in the treated lithium residue is as follows: Tl < 0.01 mg / L, Be < 0.02 mg / L. It is beneficial to resource utilization, more environmentally friendly and safer, and realizes the reuse of waste lithium residue.

This invention provides a method and equipment for preparing compound fertilizer using lepidolite slag as raw material. The method includes the following steps: S1, pretreatment: lepidolite slag is taken, crushed, and screened to obtain lepidolite slag particles with a particle size of 40 to 400 mesh; S2, activation: lepidolite slag is thoroughly mixed with an activator and a flux, and then ground to obtain powder with a particle size less than 80 mesh, wherein the activator is sodium hydroxide and anhydrous sodium carbonate, and the flux is calcium oxide; S3, sintering: the activated and ground powder is sintered at a temperature of 650℃-1000℃ for 0.5 h-5 h; S4, compounding: trace elements are added to the sintered fertilizer, mixed evenly, and ground into powder. The method for preparing compound fertilizer using lepidolite slag as raw material provided by this invention can effectively utilize lepidolite slag to prepare compound fertilizer, solving the environmental problem of large-scale accumulation of lepidolite slag and realizing the resource utilization of waste.

This invention relates to the field of lepidolite calcination technology, and particularly to a high-temperature calcination process and apparatus for lepidolite based on tail gas purification. The apparatus includes a calcination kiln body, and a feed hopper and a discharge cylinder rotatably connected to both ends of the kiln body. The kiln body is equipped with a conveying and screening mechanism for graded calcination of lepidolite, and a recovery and purification mechanism for multi-stage treatment of calcination tail gas is located on one side of the kiln body. This invention achieves graded conveying and processing of lepidolite through the counter-rotation of the kiln body and the rotating cylinder, controlling the transit time of lepidolite within the kiln body. This avoids the phenomenon of some lepidolite being discharged too slowly or too quickly, leading to local over-calcination or incomplete calcination. The graded screening calcination process for lepidolite allows small lepidolite particles to be retained by the screening mesh, delaying discharge and extending the calcination interval, creating a difference in calcination time between small and large lepidolite particles. This effectively avoids the problems of over-calcination of small particles and incomplete calcination of large particles.

The invention provides a method and a device for preparing an adsorbent for adsorbing rubidium and cesium from lepidolite leachate. The preparation method of the adsorbent for adsorbing rubidium and cesium from the lepidolite leachate comprises the following steps: S1, weighing straw powder, and carrying out soda boiling treatment on the straw powder; s2, filtering while hot, collecting filter residues, washing with deionized water, and drying; s3, transferring the filter residues into a high-pressure kettle, and adding deionized water for hydrothermal reaction to obtain a reaction product. According to the preparation method and device of the adsorbent for adsorbing rubidium and cesium from the lepidolite leaching solution, the adsorbent has the effects of high adsorption capacity, good selectivity and stability in the aspect of rubidium and cesium adsorption, and the material can adsorb a large number of rubidium and cesium ions due to the rich pore structure and ion exchange sites; and the enrichment capacity on low-concentration rubidium and cesium is improved.

The invention discloses a bifunctional ionic liquid as well as a preparation method and application thereof, and belongs to the technical field of lithium resource extraction and hydrometallurgy. According to the invention, the dual-functional ionic liquid is prepared, and the dual-functional ionic liquid can be used for synchronously realizing efficient extraction of lithium ions from the lepidolite acid leaching solution and synergic deep removal of fluorine and chlorine, so that the limitation and defects of a traditional solvent extraction agent are effectively overcome; the problems that an existing lepidolite lithium extraction technology is long in process, low in separation efficiency and serious in equipment corrosion can be solved.

The invention provides a novel lithium extraction method and device for low-grade lepidolite. The novel lithium extraction method for the low-grade lepidolite comprises the following steps: S1, mechanical activation pretreatment: crushing raw ore, treating the crushed raw ore for 2 hours by adopting a planetary ball mill, adding a sodium polyacrylate dispersing agent, and carrying out ultrasonic treatment; according to the novel lithium extraction method and the novel lithium extraction device for the low-grade lepidolite, the specific surface area of the treated mica is increased by 3-5 times, the contact area between the treated mica and assistants and a leachate is greatly increased, the subsequent roasting reaction rate and the lithium leaching efficiency can be improved, the waste of raw materials is reduced, two assistants are matched for segmented roasting, and the cost is reduced. Compared with a traditional process, the roasting temperature is greatly reduced, the energy consumption is greatly reduced, the production energy consumption cost is reduced, calcium fluoride reacts with substances generated in the reaction process (to generate calcium sulfate), fluorine element in-situ fixation is achieved, fluoride dissipation is avoided, the industrial environment-friendly problem of fluorine pollution in the traditional process is solved, and the environment-friendly emission requirement is met.

The invention discloses a lepidolite steam fluidization roasting method and system, and belongs to the technical field of treatment methods of lithium-containing minerals. The roasting method provided by the invention comprises the following steps: S1, mixing lepidolite mineral powder with a sulfate auxiliary agent to prepare a roasted raw material, adding a fluorine fixing auxiliary agent, and mixing to prepare a mixture; s2, the mixture and fluidizing gas are subjected to preheating treatment; s3, the preheated mixture and the preheated fluidizing gas are fed into a fluidized bed roasting furnace to be subjected to a fluidized roasting reaction, and roasting clinker, a fluorine fixing auxiliary and thallium-containing tail gas are obtained through separation; and S4, carrying out cyclone preheating and wet defluorination on the thallium-containing tail gas, and reacting the thallium-containing tail gas with metal sulfide to prepare thallium sulfide. The method is environment-friendly and efficient, the lithium smelting slag amount and loss of harmful elements can be remarkably reduced, the utilization rate of lithium resources is increased, and the problem that hydrofluoric acid corrodes equipment in the acid leaching process is solved.

The invention provides a high-grade lepidolite separation method which comprises the following steps: taking high-grade lepidolite, and carrying out ore grinding-screening to obtain oversize materials and undersize materials; carrying out flotation operation on the oversize material to obtain lithium concentrate 1 and an underflow product; the underflow product and the undersize material are mixed and then subjected to magnetic separation through a 2-4 T high background field intensity magnetic separator, and lepidolite pre-enriched rough concentrate and an argil product are obtained; and the lepidolite pre-enriched rough concentrate is subjected to flotation operation, and lithium concentrate 2 and tailings are obtained. The problem that the high-grade lepidolite ore dressing recovery rate is low is solved, tailing discharge is reduced, and the separation index is improved.

The invention discloses a high-strength ceramic and a blank mud preparation method thereof, and belongs to the technical field of domestic ceramics. The invention provides blank mud for preparing high-strength ceramic. The blank mud is prepared from the following raw materials in parts by weight: 28-34 parts of quartz sand, 26-32 parts of kaolin, 12-18 parts of ceramic kiln slag, 5-8 parts of red clay, 3-6 parts of lepidolite, 2-3.2 parts of copper-based alloy powder and 1-1.5 parts of aluminum borate fiber. Meanwhile, the invention also provides a matched glaze material which comprises the following components in parts by weight: 16-24 parts of ceramic kiln slag, 8-15 parts of potassium feldspar, 4-8 parts of leucite, 5-7 parts of zirconite, 3-6 parts of calcite and 0.2-0.8 part of aluminum titanate. The ceramic waste is effectively utilized to replace part of ore raw materials, the prepared ceramic has excellent strength, hardness and thermal shock resistance, the process cost is reduced, and meanwhile the application requirements of most daily use scenes can be met.

The invention discloses a method for solidifying lepidolite tailings through cooperation with fly ash under assistance of multi-stage ultrasonic heat and a derivative material for solidifying the lepidolite tailings, and belongs to the technical field of harmless and resourceful treatment of soil bodies and gravel materials. The method comprises the following steps: performing first-stage heat assistance and first-stage ultrasonic treatment on nano silicon dioxide, hydroxide and silicate to obtain a compound activator; carrying out second-stage heat assistance and second-stage ultrasonic treatment on the compound exciting agent and fly ash to obtain a mixed curing agent; mixing the mixed curing agent with the lepidolite tailings, and carrying out third-section heat assistance to obtain mixed slurry; the mixed slurry is subjected to injection molding under fourth-section heat assistance, then third-section ultrasonic treatment is conducted, then sealed curing and fifth-section heat assistance are conducted, demolding is conducted, and the lepidolite tailing slag curing derivative material is obtained. According to the method, the solidification of heavy metals in the lepidolite tailings can be enhanced in a manner of multi-section ultrasonic heat-assisted cooperation with the fly ash, and harmlessness, stabilization and recycling of the lepidolite tailings are realized.

The present application relates to a kind of composite organic acid low-temperature calcination lepidolite high-efficiency lithium extraction method.Composite organic acid low-temperature calcination lepidolite high-efficiency lithium extraction method includes the following steps: adding activating agent to lepidolite concentrate, pre-activation treatment, obtain the activated lepidolite concentrate powder;Lepidolite concentrate powder is mixed with composite organic acid calcining agent acidification calcination, obtain the calcination product;Water is added to the calcination product and leaching, suction filtration, obtain the lithium-containing leaching solution;Composite organic acid calcining agent at least includes methyl sulfonic acid.The present application solves the problem that TOT layered structure in lepidolite is difficult to destroy, resulting in low lithium ion extraction efficiency, also solves the problem that Si-O bond in the existing lepidolite crystal framework is difficult to dissociate, resulting in low lithium ion extraction efficiency.

The present application relates to the technical field of metallurgy, and particularly relates to an extraction device for rubidium and cesium salts in lepidolite. The present application can improve the efficiency of extracting rare metal elements from lepidolite, reduce the waste of rare resources, and help to simplify the process operation of extraction. The present application comprises a support, an extraction cylinder, a plate cover, a bolt and the like. The extraction cylinder is fixedly connected to the upper part of the support. Plate covers are clamped on both sides of the middle part of the extraction cylinder. Bolts are inserted into the left and right sides of the middle part of the extraction cylinder. The present application drives the six-sided rod to rotate by rotating the threaded rod driven by the motor, so that the stirring rod rotates and stirs the solid-liquid mixture of the mixed lithium mica powder and dilute sulfuric acid solution on the high-temperature rubber plug, avoids the precipitation of the lithium mica powder, and further makes the lithium mica powder and the dilute sulfuric acid solution fully mixed, so that the chemical reaction occurs rapidly, and the metal elements such as rubidium, cesium and lithium in the lithium mica powder are extracted.

The invention discloses a lepidolite roasting waste gas separation device, and relates to the technical field of solid waste pollution, the lepidolite roasting waste gas separation device comprises a storage base, and the top of the storage base is fixedly connected with a filter cartridge. According to the lepidolite roasting waste gas separation device disclosed by the invention, after gas is guided into a hollow rotary column, a driving motor II is started, a driving rotary tooth drives a driven rotary tooth to rotate, so that each rotary blade on the hollow rotary column is driven to rotate at a high speed, and in the gas rotary separation process, the separation efficiency is improved; the first hydraulic cylinder is adjusted to drive the gas blowing-out frame to move up and down in a reciprocating mode, so that gas evenly passes through all positions of the filter cartridge, the situation that the filtering effect of the filter cartridge is reduced due to accumulation of solid particles is avoided, and then the waste gas separation efficiency is improved; the rotating blades collide with gas sprayed out of the part in the rotating process, and the effect of separating solid particles in waste gas is improved.

The application provides a beneficiation method for lithium extraction from iron lepidolite ore by magnetic suspension, which adopts a process flow of "high-gradient high-intensity magnetic separation pre-concentration-flotation recovery-flotation tailings returning to magnetic separation operation" to separate and recover the iron lepidolite, and the magnetic separation operation adopts a high-gradient magnetic separator to recover the iron lepidolite through one or more high-intensity magnetic separation operations and preliminarily separate the iron lepidolite from muscovite and other gangues; the magnetic products obtained through the magnetic separation operation are combined and subjected to flotation, and a high-efficiency iron lepidolite flotation collector LYP is used to obtain high-quality iron lepidolite concentrate; the flotation tailings are returned to the high-gradient magnetic separation operation, and finally the efficient separation of the iron lepidolite is realized. The application is a new beneficiation method for iron lepidolite ore, which is stable, efficient, has strong adaptability, good separation effect and high recovery index, and is suitable for popularization and application.

The present application relates to a kind of weak magnetic lepidolite pre-elution waste-flotation enrichment method, belong to mineral processing technical field.The present application carries out coarse grinding, slurry conditioning to low-grade weak magnetic lepidolite, is pre-elution waste by high gradient magnetic separation, obtains coarse-grained high-grade lithium-containing magnetic product, again by concentration, fine grinding treatment, adds composite regulator and composite collector to carry out the selective regulation of slurry environment and mineral surface characteristics, using two roughing, once scavenging, once concentration can obtain high-quality lithium concentrate.The present application removes most of the gangue in the ore by magnetic separation, and once enrichment of weak magnetic lepidolite greatly reduces the ore processing capacity of subsequent process;Adopting fine grinding realizes that lithium mica is fully dissociated, and the new composite reagent developed is used to carry out selective hydrophobic flotation to lithium-containing magnetic product, which can realize secondary enrichment of weak magnetic lepidolite, and provides a new method for clean separation and efficient recovery of low-grade complex and difficult-to-select lithium ore.

The present invention discloses a lithium mica clinker waste heat recovery and utilization system, which includes a two-stage heat exchange and conveying device; each heat exchange and conveying device includes a kiln shell and a heat exchange pipe arranged outside the kiln shell, the inside of the kiln shell is used to transport lithium mica clinker, and the two ends of the kiln shell have a feed port and a discharge port; the discharge port of the previous stage heat exchange and conveying device is connected to the feed port of the next stage heat exchange and conveying device; the lithium mica clinker waste heat recovery and utilization system also includes an airflow generating circuit, and the airflow generating circuit is connected to the inside of the kiln shell. The present invention radiates heat outward through the wall surface of the kiln shell, and the heat is absorbed by the medium of the heat exchange pipe and recycled; during the cooling process, the airflow generating circuit forms an airflow inside the kiln shell, so that the air temperature inside the kiln shell is more uniform, thereby improving the heat exchange efficiency. In addition, the lithium mica clinker transported from the second-stage heat exchange and conveying device is cooled, which is suitable for subsequent production and processing. Compared with water spray cooling, it reduces the thermal pollution caused to the environment.

The application discloses a kind of low-grade lepidolite efficient clean lithium extraction methods, comprising the following steps: S1: lithium mica ore is mixed with sodium potassium sulfate, calcium sulfate, calcium hydroxide, lime, quartz uniformly, then mixed raw material is pressed into brick billet;S2, the brick billet is stacked, preheating drying, high-temperature calcination, cooling, crushing, powder after grinding to obtain fine powder clinker;S3: the fine powder clinker is immersed with water liquid, then through solid-liquid separation to obtain leaching solution;The application can accelerate the solid-phase reconstruction reaction of lepidolite by using sodium sulfate potassium salt, thereby improving the conversion rate of lithium;On the other hand, by adding quartz, the free energy of the solid-phase reaction between lepidolite and sulfate can be effectively reduced, so that low-grade lepidolite can also have a good transformation rate;Adding lime and calcium hydroxide is significantly better than adding calcium carbonate, not only can effectively absorb the HF gas generated in the reaction, but also can avoid the reduction of lithium leaching due to the combination of fluorine and lithium, which is beneficial to improve the leaching rate of lithium.

This invention relates to a process for extracting high-white feldspar from lithium-containing kaolin ore, comprising: Step S1, grinding and classifying the lithium-containing kaolin ore, using a high-frequency screen for inspection and screening, merging the undersize material with the overflow from a hydrocyclone, and then feeding it into a weak magnetic separator for iron removal, while the oversize material continues to be ground in a ball mill; Step S2, subjecting the material obtained after iron removal in Step S1 to a first-stage high-gradient magnetic separation; Step S3, controlling the non-magnetic material obtained in Step S2 to enter a second-stage high-gradient magnetic separation; Step S4, subjecting the non-magnetic material obtained in Step S3 to desliming in a hydrocyclone and then entering the flotation stage; Step S5, proceeding to the roughing operation; Step S6, feeding the roughing tailings from Step S5 into the scavenging operation; Step S7, feeding the scavenging tailings from Step S6 into the scavenging operation, obtaining high-white feldspar as the scavenging tailings. This invention achieves high-white feldspar with low iron content and improves the recovery rate of lepidolite.

The application discloses a method for recovering lepidolite by composite magnetization magnetic separation. The method comprises the following steps: mixing and ball-milling raw ore containing lepidolite and an activator containing iron powder, a sulfate and ferroferric oxide, dispersing the obtained ball-milling product in a solvent to form a slurry, performing superconducting low-intensity magnetic separation on the slurry to obtain an iron-removed slurry, and performing superconducting high-intensity magnetic separation on the iron-removed slurry to obtain magnetized lepidolite. The method greatly improves the surface activity of lepidolite through the synergistic effect of high-energy ball-milling mechanical energization and activator chemical energization. Furthermore, the method uses a multi-stage composite magnetization magnetic separation process of surface magnetization-low-intensity magnetic separation-high-intensity magnetic separation, thereby greatly improving the concentrate grade while improving the recovery rate of lepidolite. The method is simple in process, low in equipment investment, and suitable for industrial production and application.