104 results about "Potassium sodium" patented technology

The invention relates to the technical field of solid waste treatment, and discloses a lithium slag treatment method which comprises the following steps: (1) mixing lithium slag and an alkaline reactant, and grinding to obtain a mixed raw material; (2) sintering the mixed raw material to obtain sintered clinker; and (3) dipping the sintered clinker in an alkaline solution, and carrying out solid-liquid separation. According to the method, toxic elements in the lithium slag can be effectively removed, environmental risks caused by long-term stockpiling of the lithium slag are avoided, potassium and sodium elements in the lithium slag can be effectively removed, adverse effects of the lithium slag on soil and building materials in building and soil application are avoided, and the utilization rate of the lithium slag is increased.

To provide a piezoelectric element that can improve the insulating properties of the piezoelectric layer. [Solution] A piezoelectric element comprising a substrate, a first electrode provided on the substrate, a piezoelectric layer provided on the first electrode and containing potassium, sodium, and niobium, and a second electrode provided on the piezoelectric layer, wherein the piezoelectric layer has a first layer provided on the first electrode and a second layer provided on the first layer, and the piezoelectric layer has a first region including a first interface between the first layer and the second layer and a second region located within the first layer without including the first interface, and the molar ratio of potassium to sodium in the first region is greater than the molar ratio in the second region.

An object of the present disclosure is to provide a dense potassium sodium niobate sintered body and a sputtering target capable of producing a thin film having a desired composition and crystal phase. A potassium sodium niobate sintered body containing potassium (K), sodium (Na), niobium (Nb), and oxygen (O) satisfies 1 < (K+Na) / Nb ≤ 1.3 in terms of atomic ratio, and has a dimensional density of 3.9 g / cm 3 The above.

This piezoelectric element comprises a columnar laminate and two conductor layers. In the columnar laminate, internal electrodes and a piezoelectric body having potassium sodium niobate as the main component are alternately laminated. The two conductor layers are positioned on the respective lateral surfaces of the laminate and are connected to the corresponding internal electrodes. The piezoelectric body has a first portion and a second portion. The first portion overlaps the internal electrodes in a planar perspective view in the lamination direction. The second portion is located outside the first portion and does not overlap the internal electrodes in the planar perspective view. The concentration of at least one of potassium and sodium contained in the piezoelectric body is constant in the first portion, decreases stepwise at the interface between the second portion and the first portion, and decreases gradually from the interface to the surface in the second portion.

The raw material crusher comprises a machine body shell, a machine door arranged on the upper side of the machine body shell, and a first sealing rubber ring arranged in the middle of the machine door, and further comprises a supporting frame installed at the lower end of the machine door, a spraying opening is formed in the inner side of the supporting frame, and a second sealing rubber ring is arranged in the middle of the supporting frame. A water pump is arranged on the left side of the supporting frame. The raw material crusher capable of preventing dust from escaping and used for potassium-sodium feldspar powder processing has the function of preventing dust from escaping in the using process, so that raw materials are extruded and damaged in the device, a large amount of dust is not prone to being generated and escaping towards the outer side of the device, the escaping dust is prevented from affecting the body health of operators, the using safety of the device is improved, and the service life of the device is prolonged. And meanwhile, when the device is damaged, the device can be conveniently disassembled, assembled and overhauled, the maintenance and overhaul efficiency of the device is prevented from being affected, the maintenance and overhaul cost of the device is reduced, and the better using effect is achieved.

Provided is a piezoelectric element, a head chip, a liquid ejecting apparatus, and a sensor, which can suppress a decrease in efficiency (linearity) of displacement of a vibrating plate. The piezoelectric element of the present application includes a first electrode, a piezoelectric layer formed above the first electrode, and a second electrode formed above the piezoelectric layer, wherein the piezoelectric layer contains potassium, sodium, and niobium, and a Young's modulus of the piezoelectric layer measured by a nanoindentation method exceeds 130 GPa.

A polymer composite having piezoelectric properties that can be formed for flexible and / or thin film applications, where the polymer composite includes a polymer matrix and a piezoelectric ceramic filler embedded in the polymer matrix. The polymer matrix can include at least two polymers: a first polymer and a second polymer. The first polymer can be a fluorinated polymer and the second polymer can be compatible with the first polymer and have a dielectric constant less than about 20. The piezoelectric ceramic filler can be lithium-doped potassium sodium niobate (KNLN) and can be about 40-70 vol% of the polymer composite. The remaining 30-60 vol% can be the polymer matrix, which itself can be about 5-20 wt% of the second polymer and 80-95 wt% of the fluorinated polymer.

The invention discloses a preparation method of potassium sodium hydrogen citrate granules, which comprises the following steps: dissolving citric acid, sodium citrate and potassium citrate raw material medicines by using pure water, adding a proper amount of alcohol solvent, stirring to form a suspended raw material medicine solution, and carrying out spray drying, granulation and other processes to obtain the potassium sodium hydrogen citrate granules. The spray drying process is adopted, the mixed solvent of the pure water and the alcohol solvent is used, the uniform potassium sodium hydrogen citrate raw material medicine fine powder is obtained, the hygroscopicity of the powder is remarkably improved, the drying efficiency is high, the powder can be used for granulation without secondary smashing, and further prepared potassium sodium hydrogen citrate particles are uniform in color and good in stability and meet related quality standards.

This invention discloses a method for preparing activator-free single-component cement. The main technical method involves selecting raw meal containing silicon, aluminum, calcium, magnesium, potassium, and sodium oxides, grinding it into raw meal powder, oxidizing and calcining it at a temperature not lower than 1250°C until the phase is stable, and then rapidly cooling it to obtain clinker; the clinker is then ground into powdered cement. This cement has the characteristics of low carbon, energy saving, waste utilization, and environmental protection, and has good application prospects.

The invention relates to a high-energy planetary ball-milling thermochemical purification method for preparing high-purity silica powder from cobblestones. The invention provides an innovative process based on a wet mechanochemical effect to solve the industrial problems that traditional silica powder raw materials mostly depend on high-quality quartzite or high-purity silicon ore, so that cost is high, resources are short, and cobblestones are difficult to use in a high-valued mode due to high impurity content and high compactness. And in cooperation with high-concentration ore pulp, differential dissolution of impurity ions occurs. The process comprises the steps of raw material pretreatment, first-stage high-energy ball milling dealkalization and iron removal, intermediate washing, second-stage high-energy ball milling deep dealumination, post-treatment and the like. In the first stage, iron, potassium and sodium ions on the surface are preferentially removed by using an organic acid system, and in the second stage, an aluminosilicate skeleton is destroyed by using a fluorine-containing auxiliary agent for deep dealumination, so that the technical bottleneck that impurities such as iron and aluminum in the cobblestones are difficult to deeply remove is solved. The SiO2 purity of the silica powder prepared by the technology can reach 99%-99.9%, and the method opens up a new path for efficient utilization of the cobblestones.

The invention discloses a production process for continuously producing composite fireproof glass by a coating lamination method, and relates to the technical field of building safety material preparation, in particular to the production process for continuously producing the composite fireproof glass by the coating lamination method. Comprising the continuous steps of glass substrate pretreatment, fireproof colloid coating, multi-layer composite lamination, continuous curing, trimming and cutting, quality detection and the like. The pretreatment comprises potassium-sodium ion exchange, cleaning, drying and surface activation; a precise comma scraper and a slit die head are adopted for coating, and the thickness is controllable; the exhaust bonding is ensured through lamination segmented pressurization; curing through preheating, constant temperature and cooling sections; the appearance, the size, the light transmittance, the bubble defect and the fireproof performance are detected, the light transmittance is larger than or equal to 90%, and the fireproof performance reaches the standard. Real-time monitoring key parameters are set to adapt to products of different specifications, functional auxiliaries can be added during coating, and grinding and polishing are conducted after trimming. The process is continuous and efficient, product quality is stable, and fireproof glass production requirements are met.

The present application relates to a potassium sodium niobate based textured piezoelectric ceramic with high Curie temperature and temperature stability, and a preparation method thereof, the textured piezoelectric ceramic has a general chemical formula of (0.99-x)((K 0.5 Na 0.5 )(Nb 0.98 Ta 0.02 )O3)‑0.01(Bi(Ni 0.67 Nb 0.33 )O3)‑x(Bi 0.5 K 0.5 )HfO3+3wt.%NaNbO3, 0≤x≤0.04; the method comprises a solid phase synthesis method, a two-step molten salt method combined with a separation method, a template grain growth method, a casting process, a hot pressing process, a glue removal process, a two-step sintering process, a silver sintering process and a polarization process. Compared with the prior art, the present application can obtain a lead-free textured piezoelectric ceramic with high Curie temperature and high piezoelectric performance by the solid phase synthesis method, the template grain growth method combined with the casting process and the two-step sintering process, more importantly, the ceramic exhibits a single tetragonal phase structure, has high positive and inverse piezoelectric coefficients, and the piezoelectric coefficient and the inverse piezoelectric coefficient have small change rates in a wide temperature range, and has excellent temperature stability.

The application discloses a kind of biphasic bioactive tissue repair scaffolds and preparation method, comprising the following steps: step 1: calcium phosphate ceramic powder is modified on surface, and the modified calcium phosphate ceramic powder is obtained;Step 2: the modified calcium phosphate ceramic powder, potassium sodium niobate piezoelectric ceramic powder, dispersing agent, photoinitiator, photosensitive resin are mixed evenly, and the light-cured resin slurry is obtained after ball milling;Step 3: according to the design, 3D printing model is constructed, and the light-cured resin slurry is printed according to 3D printing model, and the scaffold body can be obtained;Step 4: scaffold body is cleaned, and the required scaffold can be obtained after defatting sintering;The application can prepare biphasic bioactive tissue repair scaffold with good mechanical properties, efficient antitumor ability and better bone regeneration capacity, and provide technical support for the repair of bone tumor postoperative bone defect in clinic.

This invention provides a modified ferroelectric polymer composite film, its preparation method, and its applications, belonging to the field of piezoelectric composite material technology. The modified ferroelectric polymer composite film includes a ferroelectric polymer base film and a plurality of composite nanoparticles and multi-walled carbon nanotubes dispersed within the ferroelectric polymer base film. The composite nanoparticles have a core-shell structure, comprising a core and an inner shell layer and an outer shell layer sequentially surrounding the core. The core comprises a composite piezoelectric ceramic material composed of potassium sodium niobate and barium titanate, the inner shell layer comprises polydopamine, and the outer shell layer comprises MnO2. This invention fully utilizes the synergistic effect of the composite nanoparticles and multi-walled carbon nanotubes on the dielectric and piezoelectric properties of P(VDF-TrFE) materials, thereby preparing a composite material with high dielectric constant, low dielectric loss, and excellent piezoelectric properties to meet the stringent performance requirements of high-performance sensors and other application fields.

The application relates to the technical field of piezoelectric ceramic devices, and particularly discloses a super-high inverse piezoelectric performance anti-reduction sodium potassium niobate-based lead-free piezoelectric ceramic with a chemical formula of (1-x)(Na 1‑y K y ) z Nb 1‑h Ta h O3-xAZr t O3+i% M+k% N, wherein x, y, z, h, t, i and k represent molar fractions, 0.04<=x<0.08, 0.45

The application provides transparent microcrystalline glass and a preparation method and application thereof. The microcrystalline glass contains Al4B2O9 nanorods, or contains Al4B2O9 nanorods and Li x Al x Si 1‑x O2 nanocrystals. The transparent microcrystalline glass is prepared by a melting-shaping-heat treatment method. The transparent microcrystalline glass is applied to the fields of information terminal protective cover plates, transparent protective windows and daily utensils. The application realizes controllable preparation of rod-shaped structure nanorods in the transparent microcrystalline glass, and significantly improves the mechanical properties of the microcrystalline glass. Moreover, the transparent microcrystalline glass has good ion exchange capacity, can realize sodium-lithium ion exchange and potassium-sodium ion exchange, and further improves the mechanical properties of the microcrystalline glass.

The application relates to a potassium-sodium niobate-based lead-free piezoelectric ceramic, the components of the potassium-sodium niobate-based lead-free piezoelectric ceramic are (1-x)K 0.48 Na 0.55 Bi a Nb 0.96 Zr b Sb c O3-a-b-c-CuOx; wherein 0.01<=a<=0.08, 0.02<=b<=0.08, 0.02<=c<=0.08, 0.001<=x<=0.2, x represents the molar fraction of CuO, the application can effectively improve the ceramic oxygen vacancy concentration and enhance the pinning effect of the ceramic ferroelectric domain wall by regulating the proportion of copper oxide, so that a potassium-sodium niobate-based lead-free piezoelectric ceramic with moderate d 33 And high mechanical quality factor Qm is obtained, which is expected to be applied in the field of lead-free medium-power piezoelectric devices. In addition, the process for preparing the potassium-sodium niobate-based lead-free piezoelectric ceramic is simple, the cost is low, and the application has the potential for industrial application.

The invention relates to the field of dielectric energy storage ceramic materials, in particular to potassium-sodium niobate-based energy storage ceramic as well as a preparation method and application thereof. The chemical composition of the potassium-sodium niobate-based energy storage ceramic comprises (1-x) (0.55 K0. 5Na0. 5NbO3-0.45 BaTiO3)-x (Bi0. 5yNa0. 5 + y) Ti0. 9Zr0. 1O3, x is more than 0 and less than or equal to 0.4, and y is more than or equal to-0.05 and less than or equal to 0.1. The potassium-sodium niobate-based energy storage ceramic still keeps excellent energy storage efficiency while having high energy storage density, and can meet the use requirements to a greater extent, specifically, at the room temperature of 100 Hz, the energy storage density of the potassium-sodium niobate-based energy storage ceramic is 7.02 J / cm < 3 >-10.55 J / cm < 3 >, and the energy storage efficiency is 91.7%-94.2%.

The application discloses a multi-sulfur-based heavy metal removal agent for steel plant ash washing wastewater, a preparation method thereof and a method for treating ash washing wastewater by using the same, and high-purity potassium chloride is produced by using high-salt solid waste ash generated by a steel enterprise. Meanwhile, based on the characteristics of the high-salt solid waste ash, such as high thallium, ammonia nitrogen and sulfate radical concentration in the water washing wastewater, a deep thallium removal idea based on weak reduction and complexation breaking, same ion effect precipitation and chelation thallium removal is first proposed, the multi-sulfur-based heavy metal removal agent is used to realize deep removal of thallium in the high-salt wastewater, and combined with the characteristics of the sintering flue gas purification and acid wastewater containing a large amount of sulfite ions and low acidity, the multi-sulfur-based heavy metal removal agent is used for removing sulfur, removing ammonia nitrogen and removing thallium in the ash washing wastewater, and the countercurrent evaporation and potassium and sodium separation are used for the synergistic effect, so that the collaborative treatment and resource utilization of the high-salt solid waste ash and the acid wastewater of the steel plant are realized, and the quality of the recovered potassium salt is greatly improved. Meanwhile, the technical scheme provided by the application also has the advantages of simple process conditions, low energy consumption, no wastewater discharge and the like.

This invention belongs to the field of ceramic technology. It proposes an ultra-thick lightweight foamed ceramic and its preparation method. Expressed in oxide form, the chemical composition of the ultra-thick lightweight foamed ceramic, calculated by mass percentage, includes: 65-70% silicon, 17-20% aluminum, 3-6% potassium, and 2-4% sodium, wherein the silicon-to-aluminum ratio is 3.5 ≤ silicon-to-aluminum ratio ≤ 4.0, and the potassium-to-sodium ratio is ≥ 1.30. The foamed ceramic obtained by this invention has a thickness of 150-170 mm, uniform foaming without large bubbles, and exhibits advantages of low density and high compressive strength, achieving a lightweight and high-strength effect in ultra-thick foamed ceramics.

The invention belongs to the technical field of brazing materials, and particularly relates to a synthesis method of a nanoscale hydroxyl fluorine metal acid potassium / sodium brazing flux for aluminum brazing. The aluminum hydroxide, the potassium hydroxide / sodium hydroxide / calcium hydroxide / magnesium hydroxide and the hydrofluoric acid aqueous solution are used as main raw materials, the novel aluminum brazing flux is prepared in the presence of an organic solvent / water mixed system, and the prepared brazing flux has the advantages of being low in melting point, small in particle size, concentrated in distribution and high in dispersion stability; the comprehensive performance is obviously superior to that of the brazing flux prepared by a traditional method; the prepared brazing flux is low in cost, convenient to use, good in film forming effect, low in dosage and high in surface smoothness after brazing.

According to the method for preparing the vanadium electrolyte through targeted impurity removal and one-step vanadium precipitation of the sodium-modified vanadium solution, high-purity ammonium metavanadate is prepared through targeted impurity removal of the sodium-modified vanadium solution, and calcination is conducted under the protection of inert gas of ammonium metavanadate, so that the consumption of auxiliary materials and the generation amount of waste water are greatly reduced; the manufacturing process cost of the vanadium electrolyte is effectively reduced; by adopting a two-time silicon removal mode, the use amount of a silicon removal agent is reduced while high-efficiency removal of chromium is realized, and the generation amount of silicon removal slag and the vanadium loss in the silicon removal process are reduced. In addition, the pH value of the liquid subjected to deep silicon removal is lower than that of the liquid subjected to chromium removal, so that the aluminum concentration of the liquid subjected to deep silicon removal can be effectively reduced, and conditions are created for improving the subsequent hydrolysis aluminum removal effect; the crude ammonium metavanadate is pulped and washed by adding a complexing agent, the content of cations such as potassium, sodium and calcium is reduced, the ammonium metavanadate is calcined under the protection of inert gas to obtain low-valence vanadium oxide, the acid solubility of the vanadium oxide is improved, and the consumption of a reducing agent in the preparation process of the vanadium electrolyte is reduced.

The application provides a double-rare earth doped photoelectric storage film and a preparation method and application thereof, and the method comprises the following steps: (1) pressing Eu2O3 and Tb4O7 into sheet structures respectively, obtaining Eu2O3 target material and Tb4O7 target material after high-temperature calcination; and placing the Eu2O3 target material and the Tb4O7 target material on a KNN target material to simultaneously perform radio frequency sputtering, and obtaining a photoelectric storage film. The photoelectric storage film of the double-rare earth doped potassium sodium niobate prepared by the application has high transparency, full-waveband fluorescent reading, good stability and bending resistance, and can realize coupling between photochromism and dielectric energy storage in the film material, thereby providing a new opportunity for the application requirement of constructing a future flexible foldable photoelectric storage device.

The invention provides a lead-free piezoelectric ceramic material, a preparation method thereof and a piezoelectric device. The lead-free piezoelectric ceramic material is represented by a chemical general formula as follows: (1-x-y) (K1-aNaa) (Nb1-bMb) O < 3-x > AWO < 4-y > BMoO < 4 >, wherein (K1-aNaa) (Nb1-bMb) O3 represents a potassium-sodium niobate-based ceramic material, a is greater than or equal to 0.4 and less than or equal to 0.6, b is greater than or equal to 0 and less than or equal to 0.1, and M is a doped metal element; x and y are mole fractions and satisfy 0 lt; x is less than or equal to 0.05, 0lt; y is less than or equal to 0.05, and 0 lt; x + y < = 0.1; the AWO4 is tungstate, and the BMoO4 is molybdate. Through the synergistic effect of tungstate and molybdate, the sintering temperature of the lead-free piezoelectric ceramic material is reduced, the piezoelectric constant of the lead-free piezoelectric ceramic material is improved, the dielectric loss of the lead-free piezoelectric ceramic material is reduced, the comprehensive performance of the lead-free piezoelectric ceramic material is greatly improved, and the lead-free piezoelectric ceramic material can be applied to piezoelectric devices such as piezoelectric motors with high requirements for piezoelectric performance.

The invention provides a high-fracture-resistance ceramic material and a preparation method thereof. The high-fracture-resistance ceramic material comprises the following raw materials in parts by mass: 50 parts of potassium-sodium feldspar, 15-25 parts of dolomite, 20-30 parts of anorthite, 3-13 parts of a reinforcing agent, 0.1-0.5 part of solid ceramic microbeads, 1-3 parts of rice hull ash and 1-5 parts of a binder. The reinforcing agent comprises modified molybdenum disilicide, the modified molybdenum disilicide comprises a molybdenum disilicide core and an yttrium phosphate shell layer, and yttrium oxide is loaded on the surface of the molybdenum disilicide core. Through the design of the reinforcing agent, the obtained ceramic material has good fracture resistance, can bear large external force and is not prone to fracture, and the ceramic material is suitable for high-strength application occasions.

The invention provides a piezoelectric element, a liquid ejection head, and a printer, which can reduce the possibility of crack generation of a piezoelectric layer. A piezoelectric element includes: a substrate; a first electrode having an adhesion layer containing titanium provided on the substrate, and a conductive layer provided on the adhesion layer; a diffusion suppression layer that is provided on the first electrode and suppresses diffusion of the titanium; a piezoelectric layer that is provided on the diffusion suppression layer and contains potassium, sodium, and niobium; and a second electrode provided on the piezoelectric layer, the diffusion suppression layer covering an upper surface and a side surface of the first electrode.

The application discloses a kind of potassium sodium fluorite magnetite hydrogen-based shaft furnace direct reduction iron-making methods, specifically comprising: according to mass percentage, potassium sodium fluorite magnetite concentrate: 60%-70%, ordinary iron concentrate: 30%-40%, outside matching bentonite: 3.0%-3.5% are placed in mixer, so that pelletizing raw materials are mixed uniformly;With the pelletizing mixture as raw material, 12-16mm green ball is prepared on disc pelletizer by spraying water;Green ball is obtained after drying, preheating, oxidizing roasting oxidized pellet, and then the oxidized pellet is added from the top of hydrogen-based shaft furnace to carry out direct reduction in hydrogen-based shaft furnace;Reduced metallized pellet is placed in vacuum medium frequency induction furnace and is smelted and separated.The purpose of the present application is to provide a kind of potassium sodium fluorite magnetite hydrogen-based shaft furnace direct reduction iron-making method, and the development of potassium sodium fluorite magnetite hydrogen-based shaft furnace direct reduction iron-making process is an important technical approach for efficient utilization of potassium sodium fluorite magnetite, and has important practical significance.

The invention relates to the field of ceramic preparation, in particular to high-strength ceramic prepared from industrial waste residues and a preparation method of the high-strength ceramic. The high-strength ceramic utilizing the industrial waste residues is prepared from the following raw material components in parts by weight: 12 to 18 parts of pretreated industrial waste residues, 10 to 15 parts of modified kaolin, 5 to 10 parts of quartz sand, 25 to 30 parts of potassium-sodium mixed sand, 10 to 15 parts of black mud, 10 to 15 parts of ultra-white sand, 20 to 30 parts of potassium-sodium feldspar powder, 4 to 8 parts of diopside, 2 to 4 parts of wollastonite, 1 to 3 parts of coupling agent and 1 to 2 parts of stabilizer. And 1-2 parts of reinforced fibers pretreated by a silane coupling agent. The industrial waste residue comprises one or more of fly ash, steel slag and mineral slag. According to the high-strength ceramic, a large amount of pretreated industrial waste residues are adopted as raw materials, solid waste can be recycled, the strength of the ceramic can be improved, and the high-strength ceramic has environment-friendly value and economic benefits.

The invention relates to a Beijing brick ceramic preparation method, which comprises: preparing a green body, weighing 25-35% by weight of kaolin, 35-40% by weight of potassium-sodium feldspar, 3-5% by weight of a high aluminum material, 5-6% by weight of anorthite and 1% by weight of a grinding aid additive, mixing, and ball-milling until the particle size D50 of the powder is less than or equal to 10 [mu] m to prepare a slurry; removing iron from the slurry through a 120-mesh sieve, and performing spray drying to obtain green body dry powder with the water content of 8-10%; surface effect treatment: bidirectionally pressurizing the green body dry powder by using a hydraulic press; and polishing, wherein a diamond grinding block and a fiber grinding block are combined for polishing. On the basis of wear resistance, skid resistance and light sensation optimization, the water-repellent anti-fouling polished tile synchronously has high mechanical strength and water-repellent anti-fouling property, can break through the application limitation of traditional polished tiles, is suitable for scenes such as historic building repair and cultural relic protection which have high requirements on cultural restoration, and also has good water-repellent anti-fouling performance. And the method can also be used for scenes with requirements on performance and texture, such as corridors, kindergarten activity rooms, high-end villa whole houses and the like.

The invention provides a method for recovering metal elements in smoke dust of a rotary hearth furnace, and relates to the technical field of comprehensive recovery of metals. The recovery method comprises the following steps: carrying out water leaching treatment and purification treatment on smoke dust of the rotary hearth furnace to obtain a potassium-sodium solution and a zinc-rich precipitate; the water leaching residues are subjected to first-time acid leaching treatment and second-time acid leaching treatment, and acid leaching liquid and acid leaching residues are obtained; ferric iron in the acid leaching solution is reduced into ferrous iron; and adjusting the pH value to precipitate and separate out bismuth, indium and germanium. According to the recovery method, through selective leaching, two-stage deep extraction and ingenious internal material circulation, efficient recovery of main metal such as potassium, sodium, zinc and lead is achieved, high-value scattered rare metal such as indium, germanium and bismuth is more successfully and comprehensively recovered, and comprehensive utilization of smoke dust resources of the rotary hearth furnace is achieved to the maximum extent.