842 results about "Potassium sodium" patented technology

The invention discloses a method of plating Nickel with magnalium alloy without cyanogen and the plating technique. The direction for the plating solution is: 20 to 80g.dm-3 of copper charred phosphate; one or several of the 60 to 320g.dm-3 of sodium charred phosphate or Potassium charred phosphate or 60 to 250g.dm-3 of sodium citric acid, 5 to 20g.dm-3 of Potassium sodium tartaric acid, 60 to 250g.dm-3 of HEDP and 60 to 250g.dm-3 of amine ethylene; one or several of the 5 to 20g.dm-3 of hydrogen amine di-fluorin or 5 to20 g.dm-3 sodium fluoride or 5 to 20g.dm-3 of Potassium fluoride or 5 to 20g.dm-3 of lithium fluoride. The plating solution chooses the nickel sulfate or alkali type nickel carbonate or nickel acetic acid as the main salt and adds the reducing agent, combination agent and stabilization agent. The plating technique adopts the acid plating copper-plating three nickel-plating chromium. The invention has little pollution to the environment, high binding power and erosion-proof property.

A piezoelectric film formed above a Si substrate. The piezoelectric film is formed of a potassium sodium niobate expressed by a general formula (K,Na)NbO3 with perovskite structure. A film thickness of the piezoelectric film is within a range from 0.3 μm to 10 μm. An intermediate film is formed between the Si substrate and the piezoelectric film. The intermediate film generates a stress in a compressive direction in the piezoelectric film.

A thin film piezoelectric element according to the present invention includes a potassium sodium niobate thin film having a structure in which a plurality of crystal grains are present in a film thickness direction; and a pair of electrode films sandwiching the potassium sodium niobate thin film. When the potassium sodium niobate thin film is divided into three regions of the same thickness in the film thickness direction and average crystal grain sizes A1, A2, and A3 of the respective regions are determined, a ratio m / M of the smallest average crystal grain size m among A1, A2, and A3 to the largest average crystal grain size M among A1, A2, and A3 is 10% to 80%. The region having the smallest average crystal grain size m lies next to one of the pair of electrode films.

The invention relates to a comprehensive utilization method for bittern, which belongs to the technical field of salt chemical engineering. The bittern is a liquid mineral product, and is rich in multiple elements such as potassium, sodium, lithium, boron, bromine, iodine and the like; and at present, in the prior domestic bittern development and utilization, some simple components or components with high additional value in the elements are extracted, and the un-extracted components are discharged along with old bittern to be abandoned so as to cause serious waste of resources and pollute the environment. Through reasonable combination of processes of removing H2S from the bittern, settling magnesium, settling calcium and preparing calcium carbonate, preparing potassium-sodium mixed saltthrough primary salt preparation and secondary salt preparation, extracting potassium chloride through flotation, extracting boron, iodine, bromine, rubidium and cesium through acidification, preparing rubidium chloride and cesium chloride, extracting lithium and the like, the method implements step-by-step ordered extraction of main components; the toil yield of several main components reaches over 95 percent; and the method has the advantages of mutually exclusive loss in component extraction, implementation of closed cycle of processes, no mother liquor discharge, simple process control, low cost, high yield, environmental protection and the like.

The present invention relates to the preparation process and preparation of Yanuning. Yanuning is prepared through an esterification reaction and a salt-forming reaction. During the esterification reaction, andrographolide and succinic anhydride react in pyridine solution and the resultant is post-treated to obtain dehydroandrographolide semi-succinate. During the salt-forming reaction, dehydroandrographolide semi-succinate and KOH, KHCO3 or K2CO3 react in water to form monopotassium salt of dehydroandrographolide semi-succinate, and through post-treatment, Yanuning is prepared. The present invention has mild reaction condition and nitrogen protection to avoid oxidation and degradation, excessive pyridine added into the reaction for dewatering without need of vacuumizing, and heating reflux in the later reaction stage for complete reaction.

The invention relates to niobium sodium potassium antimonate-potassium sodium bismuth zirconate leadless piezoelectric ceramic with a high piezoelectric constant and a preparation method thereof, which belong to the field of environmental coordinative piezoelectric ceramic of perovskite structures. The leadless piezoelectric ceramic with a general formula of (1-x) (K1-yNay) (Nb1-zSbz) O3 + xBi0.5 (Na1-uKu) 0.5ZrO3 is prepared by a traditional solid state sintering method, wherein in the formula, x is not smaller than 0 while not larger than 0.05, y is not smaller than 0.40 while not larger than 0.68, z is not smaller than 0.02 while not larger than 0.06, and u is not smaller than 0 while not larger than 1; the d33 of the leadless piezoelectric ceramic disclosed by the invention can be as high as 470 pC / N, kp can reach 47%, and Tc is as high as 313 DEG C. Devices prepared by the ceramic can work under high temperatures, so that the ceramic has a practical application value in high-temperature electronic equipment; since the ceramic contains no expensive tantalum element, the price of the used raw materials is low, so that the cost is saved.

The invention discloses a material for preparing negative ion far-infrared antibiotic functional ceramic product and application, the formulation and the weight percentage of component consumption are that 80-300 nanometer tourmaline powder 5-10%, 12-15 micrometer tourmaline powder (the purity is over 95%) 20-30%, nanometer grade titanium oxide 5-8%, kaolin 20-45%, activated bamboo charcoal 5%, potassium sodium feldspar powder 10-20% and water remainder. The material of the ceramic product can be made into various needed ceramic product utensils or ceramsite and potteries according to the need, and can produce negative ion and far infrared and is provided with antibiotic function, which has the advantages of antibiotic function and excellent inhibition for Staphylococcus aureus, escherichia coli, Candida, mold and the like, and can digest beneficial trace quantity of minerals of human body to lead water micellae to become small, adsorb heavy metal, and adjust pH value of water which is made to approach faintly alkaline.

The invention discloses a potassium-sodium niobate based oxide up-conversion luminescent material with a chemical formula of (Na0.5+sigmaK0.5-yAy)1-x-zMxYbzNbO3:Phi C or (Na0.5-yAyK0.5+sigma)1-x-zMxYbzNbO3: Ph iC, wherein M is selected from one or more of Li, Na, K, Tl and Ag; C is selected from one or more of Li, Na, K, Tl and Ag; A is one or more of K, Na and Li; a value range of x is not smaller than 0.00001 and not bigger than 0.15, the value range of y is not smaller than 0 and not bigger than 0.5, the value range of z is not smaller than 0 and not bigger than 0.35, the value range of sigma is not smaller than 0 and not bigger than 0.1 and the value range of Phi is not smaller than 0 and not bigger than 0.1. The luminescent material disclosed by the invention further has up-conversion luminescent characteristic in addition to piezoelectric performances, ferroelectric performances and dielectric performances, belongs to photoelectric multifunctional materials, and not only can be applied to the piezoelectric field, but also can be applied to the sensor field, the information storage field, the biological detection field and the biomedical field.

The invention discloses a method for preparing potassium dehydroandrographolide succinate or potassium sodium dehydroandroan drographolide succinate, which comprises that firstly, andrographolide serves as a raw material, the andrographolide reacts with succinic anhydride to produce dehydroandroan drographolide disuccinate in a specific non-pyridine solvent under the heating reflux in the presence of a catalyst, and the usage amount ratio (W / W) of the andrographolide and the catalyst is (1:10)-(1:1); and secondly, the purified dehydroandroan drographolide disuccinate reacts with potassium hydroxide, sodium hydroxide, alkalinity sylvite or alkalinity sodium salt to produce the potassium dehydroandrographolide succinate or the potassium sodium dehydroandroan drographolide succinate in methanol, ethanol or hydrosolvent. The method is practical, convenient to operate, low in cost and nontoxic. The potassium dehydroandrographolide succinate or the potassium sodium dehydroandroan drographolide succinate is prepared easily under the normal atmosphere through usage of the solvent, the product quality is guaranteed, and the method is suitable for industrial production particularly.

The invention discloses a system for extracting potassium sodium salt from garbage incineration fly ash and a method for extracting the potassium sodium salt by utilizing the system. The system comprises a fly ash washing and salt dissolution unit, a filtrate precipitation treatment unit and a potassium sodium salt purification unit, wherein the potassium sodium salt purification unit comprises a preheater as well as a NaCl crystallization treatment device and a KCl crystallization treatment device which are connected with the preheater in succession, and the NaCl crystallization treatment device and the KCl crystallization treatment device have a circulation loop structure respectively; the fly ash washing and salt dissolution unit is connected with the filtrate precipitation treatment unit through a vacuum filter arranged in the fly ash washing and salt dissolution unit; and the filtrate precipitation treatment unit is connected with the preheater of the potassium sodium salt purification unit through a water collection tank arranged in the filtrate precipitation treatment unit. The method comprises working procedures of fly ash washing and salt dissolution, filtrate precipitation treatment and salt extraction. By the method, wastes are changed into resources; the method is energy-saving and environment-friendly; the whole system is automatically controlled; the labor is saved; the purities of extracted NaCl crystallized salt and KCl crystallized salt are over 85 percent and 80 percent respectively; and the method benefits both people and country and is easy to popularize and implement.

The invention discloses a method for determining content of potassium, sodium, calcium and magnesium in cigarette paper simultaneously, which includes the following steps: cutting 100+ / -0.1 mg of a cigarette paper sample, using 100mL of 0.02mol / L hydrochloric acid as an extracting agent, ultrasonic-extracting for 18-22min to obtain extract liquor, selecting 5.0mL of the extract liquor to a 25mL volumetric flask, bringing to the volume with 0.02mol / L hydrochloric acid to obtain diluent, and filtering the diluent through a 0.45 mu m filtering film to obtain sample liquid to be detected; selecting sodium chloride, potassium chloride, hexahydrate magnesium chloride and anhydrous calcium chloride, using pure water as solvent, preparing mixed standard solution through gradual diluting, and adding 0.02mol / L hydrochloric acid to prepare series standard working solution; detecting and analyzing the series working solution and the sample liquid to be detected respectively through an ion chromatographic instrument; and drawing a standard curve and calculating results. The method is fast and simple to operate, high in sensitivity, low in detection limit, good in recovery rate, and suitable for batch analyzing of important inorganic elements in the cigarette paper.

The invention provides a low-grade potassium sodium feldspar quarry floatation and purification process and belongs to the technical field of ore separation. The process includes double ore grinding, double magnetic separation, ore concentrate floatation and the like. The process has the advantages that quality and recycling rate of potassium sodium feldspar concentrate are increased evidently, the process is simple, low in cost, especially suitable for the field of ore separation of the low-grade potassium sodium feldspar complex and difficult in separation, high-grade potassium sodium feldspar concentrate with high recycling rate can be floated from low-grade raw ore, ore resource utilization rate is increased, and the process is significant to developing and utilizing low-grade or secondary ore resources.

The invention discloses a process of preparing Dehydroandrographolide Succinate Sodium and Potassium salts with Potassium Dehydroandrograpolide Succinate. The process comprises the steps of: weighing right amount of Potassium Dehydroandrograpolide Succinate, adding absolute ethyl alcohol about 3 to 6 times to make suspension; weighting mole Sodium bicarbonate in equal weight, adding water to dissolve, dripping slowly Sodium bicarbonate solution in potassium dehydroandrograpolide succinate suspension in a water bath at a temperature of between 40 and 60 DEG C, mixing into liquid medicine and defecating, dissolving impurity and filtering, putting on a 0.22 mu m filter membrane, adding absolute ethyl alcohol about 7 to 12 times while mixing, after 10 to 30 minutes of mixing, natural crystallization seeds out after 13 to 18 hours standing in room temperature; filtering and washing 2 to 3 times with right amount of absolute ethyl alcohol; filtering and drying with less pressure. The invention provides a process route of preparing potassium sodium dehydroandroan drographolide succinate for injection with high purity, which is high in process yields, high in product purity, good in solubility, less in impurity and complete in combination of Potassium and Sodium; no obvious toxic and side effect in clinic application, the preparation is more stable compared with the similar and can be prepared into various preparations.

The invention belongs to the technical field of medial material manufacturing, and discloses a biomimetic bone piezoelectric three-dimensional ceramic support material and a preparation method and application thereof. The method comprises the steps that 1, piezoelectric ceramic powder, a dispersing agent, a binder and a thickener are mixed to be prepared into slurry, and a three-dimensional porous ceramic support is obtained through a 3D printing technology; 2, the three-dimensional porous ceramic support is subjected to drying, high-temperature sintering and high voltage polarization, and the biomimetic bone piezoelectric three-dimensional ceramic support material is obtained. The piezoelectric powder is potassium sodium niobate powder or barium titanate powder or other ceramic powder containing potassium sodium niobate; the dispersing agent is polyacrylate, and the binder is a mixture of polyvinyl alcohol and glycerin. According to the biomimetic bone piezoelectric three-dimensional ceramic support material and the preparation method and application thereof, the method is simple, and the cost is low; the material has a good communicating pore structure and piezoelectricity similar to a natural bone itself, and structure and function double bionic design is achieved; the biomimetic bone piezoelectric three-dimensional ceramic support material is a functional bone repair material with great potential.

The invention discloses a potassium-sodium-manganese-iron-based Prussian-blue electrode material, and a preparation method and application thereof, belonging to the technical field of synthesis of new-energy materials. According a technical scheme in the invention, the potassium-sodium-manganese-iron-based Prussian-blue electrode material has a general chemical formula of K<x>Na<y>MnFe(CN)<6>, wherein x and y are both more than 0 and less than 2; and the material has a cubic structure and a particle size of 10 to 200 nm. The invention also discloses the preparation method for the potassium-sodium-manganese-iron-based Prussian-blue electrode material and application of the material to the positive electrode of a sodium-ion battery. The potassium-sodium-manganese-iron-based Prussian-blue electrode material prepared in the invention has the cubic structure and a particle size of 10 to 200 nm; the nanometer three-dimensional structure of the material leads to increase in the specific surface area of the material and effective reduction in transfer distance of ions or electrons in the electrode material, so the rate performance and cycle stability of the electrode material are improved; and the electrode material has excellent electrochemical performance as a positive electrode material for the sodium-ion battery.

The invention aims to provide a method for preparing potassium-sodium niobate textured ceramic and potassium-sodium niobate single crystal. K0.5Na0.5NbO3 is used as a main material and LiBiO3 or BiNiO3 is used as a doping raw material; and the method comprises the following steps of: performing wet-milling on the materials by using anhydrous alcohol as a medium and drying the materials to synthesize a ceramic material; performing secondary ball milling on the ceramic material, drying the ceramic material and adding an adhesive into the ceramic material to granulate; pressing the mixture under the pressure of 110MPa to prepare a biscuit sample; horizontally placing the biscuit sample into a high temperature electric furnace for sintering; and cooling the sintered biscuit sample along with the furnace to the room temperature so as to prepare KNN-based ceramic, wherein the single crystal with size of over 2mm can also be obtained by controlling the sintering temperature and the sintering time. By using the conventional ceramic preparation process, the KNN ceramic with superior preferred orientation is prepared under normal conditions; and the single crystal with size of over 2mm can also be obtained by controlling the sintering temperature and the sintering time.

The invention relates to a posttreatment method capable of reducing the VOC (volatile organic compound) content and odor of polyether polyol. The polyether polyol is prepared from an initiating agent and oxyalkylene through reaction under the effect of an alkali metal catalyst. The method is characterized in that an adsorbent accounting for 1.0 to 1.5 percent of the total mass of coarse polyether polyol is added at 80 to 120 DEG C; after stirring and adsorption, the temperature is lowered to 80 to 90 DEG C; then, water accounting for 8 to 10 percent of the total mass of the coarse polyether polyol is added; next, after secondary stirring, a vacuum system is started; meanwhile, temperature rise is performed for removing water and low-boiling point substances in the coarse polyether polyol; after the moisture is qualified through analysis, filter pressing is performed to obtain a finished product. The potassium-sodium ions are enabled to be adsorbed and removed; meanwhile, the odor and the VOC content of the polyether polyol are reduced.

The invention discloses a low-temperature sintered potassium sodium niobate lead-free piezoelectric ceramic, which is expressed by a low-temperature clinker of a general formula KaNabNbO3-x, wherein a and b express molar fractions of elements respectively, the a is more than or equal to 0.3 and less than or equal to 0.7, and the b is more than or equal to 0.3 and less than or equal to 0.7; x expresses weight percentage of the low-temperature clinker in the KaNabNbO3, and x is more than 0 and less than or equal to 15 percent; and the low-temperature clinker consists of one or more of Li2O, Na2O, K2O, B2O3, SiO2, CaO, BaO, ZnO, CuO, MnO2 and MgO. The invention also discloses a preparation method for the potassium sodium niobate lead-free piezoelectric ceramic. Low-temperature sintering is realized by adding the clinker, the firing temperature range is enlarged at the same time of effectively reducing the sintering temperature of potassium sodium niobate, the stoichiometric ratio is controllable, the chemical component fluctuation is low, and a piezoelectric material with excellent and stable performance is obtained.

The invention discloses a preparation method and application for a fly ash based polymer cementing material and a porous concrete material. The fly ash based polymer cementing material is composed of fly ash, granulated blast-furnace slag, nanometer zeolite powder, gypsum powder, and a compound alkali activator prepared from potassium-sodium water glass and caustic alkali; porous concrete is prepared from the fly ash based polymer cementing material and special-grade coarse aggregates like basalt or granite, is applied in construction of road pavement and has the characteristics of high porosity, good water permeability, skid resistance and sound-absorptive and noise-reducing properties, high strength, stable volume, excellent durability, etc.; meanwhile, the fly ash based polymer porous concrete has simple preparation method and low production cost, and meets industrial production and construction requirements.

A varistor is provided which can be driven at a low voltage, has a small leak current, and can realize a high ESD resistance and a high surge resistance. The varistor is formed using a ceramic composition for a varistor which contains zinc oxide as a primary component and sub-components including praseodymium at a content of 0.05 to 3.0 atomic percent of the total, cobalt at a content of 0.5 to 10 atom percent of the total, at least one of potassium, sodium, and lithium at a total content of 0.005 to 0.5 atom percent of the total, at least one of aluminum, gallium, and indium at a total content of 2×10−5 to 0.5 atom percent of the total, and zirconium at a content of 0.005 to 5.0 atom percent of the total.

The invention relates to a special stainless steel electrode for a deep refrigerating project, belonging to the field of welding material; the special stainless steel electrode is formed by mixing the following powered raw materials b weight parts: 38-46 parts of rutile, 12-15 parts of marble, 1-3 parts of titanium pigment, 1-3 parts of quartz, 4-6 parts of mica, 4-6 parts of silicon iron, 2-4 parts of ferrotitanium, 6-8 parts of electrolytic manganese, 3-5 parts of chromium metal, 1-3 parts of calcium solvent, 1-3 pars of sodium carbonate, 4-7 parts of cryolite, 6-8n parts of feldspar, and potassium sodium water glass with 2 percent of total weight of powered materials; the mixture is stirred uniformly and is press-coated on a stainless steel core wire to form a stainless steel electrode. The ferrite content in weld metal is suitable, ferrite number FN of the weld metal is 6-8; the weld metal has good minus 196 DEG C low temperature impact property, the average value of the V-shaped impact work of the weld metal at below 196 DEG C is 45j, thereby completely meeting engineering needs.

The invention relates to a potassium niobate natrium series leadless piezoelectric ceramics and the manufacturing method. It is expressed by the general equation: (1-u)[(1-n)(LitNa1-w-t1Kw-t2)(Nb1-g-fTagSbf)O3+nBiMeO3]+uM. The invention has stable manufacturing technology and has great usefulness.

The invention relates to a lead-free piezoceramics-polymer piezoelectric composite material and a preparation method thereof. The method comprises the following steps: preparing materials according to compositions in a chemical general formula (1-x)(LiaNabK1-a-b)(Nb1-cSbc)O3-xABO3-yM, taking analytically pure anhydrous carbonates or oxides as raw materials, and preparing ceramic powder by the conventional ceramic preparing process; performing mixing and ball-milling on the ceramic powder and polyvinylidene fluoride in a volume ratio of between 10:90 and 95:5; and drying, performing ultrasonic oscillation for 10 to 100 minutes, performing cold press molding on the mixed powder material by a tablet press, processing by heating through a muffle furnace, finally sputtering gold electrodes on the surface of the powder material, and performing polarization in a silicone oil bath at a temperature of between 80 and 130 DEG C for 10 to 120 minutes to prepare the potassium-sodium niobate-based lead-free piezoceramics-polymer piezoelectric composite material. The piezoelectric composite material has pure perovskite crystalline phase and no impurity phase to prove that the two have good solid solubility, and has good piezoelectric and dielectric properties.

The invention discloses potassium-solium niobate leadless piezoelectric ceramics and a preparation method thereof, and pertains to the functional material field. A chemical constituent of the material is (1-x) (Li0.06Na0.52K0.42)NbO3+xRO, wherein, x is more than or equal to 0 and less than or equal to 0.02, and the RO is metallic oxide. The invention adopts two steps sintering method to produce the potassium-solium niobate leadless piezoelectric ceramics under strictly controlling sinter temperature and the speed of raising temperature; the first step is that temperature raises to 850 - 950 DEG C at a speed of 30 DEG C per minute; the second step is that the temperature is raised to between 1050 and 1150 DEG C at a speed of 10 DEG C per minute and 2 to 10 minutes for insulation; the temperature lowers to 950 - 1050 DEG C at a speed of 20 DEG C per minute and 10 to 20 hours for insulation, and then the temperature is lowered to room temperature; after the steps, the novel piezoelectric ceramics is finally made; compared with the traditional sintering technique, the piezoelectric constant d33 is raised by 10 to 20 percent.

The invention discloses preparation methods of potassium sodium dehydroandroan drographolide succinate and a freeze-dried powder injection thereof. The preparation method of potassium sodium dehydroandroan drographolide succinate comprises the following steps: dissolving potassium dehydroandrograpolide succinate into water for injection with mass being 4-5 times the mass of potassium dehydroandrograpolide succinate, then adjusting the pH value between 7.1-7.5 with 0.1-0.2mol / L of sodium hydroxide solution; and then adding activated carbon to remove the impurities, sequentially using a 0.45mu m microfiltration membrane and a 0.22mu m microfiltration membrane for filtration, collecting the filtrate and freeze drying the filtrate, thus obtaining potassium sodium dehydroandroan drographolide succinate. The preparation method of the freeze-dried powder injection of potassium sodium dehydroandroan drographolide succinate comprises the following steps: dissolving potassium sodium dehydroandroan drographolide succinate and sodium chloride into water for injection at 45-60 DEG C, adding activated carbon for needle with mass being 0.1% of the mass of the solution after uniform mixing, controlling the pH value of the solution between 6.4-6.8, replenishing the water for injection to the required amount; and carrying out filtration for decarbonization, then using a 0.22mu m microfiltration membrane for filtration, using an ultrafiltration membrane with cut-off molecular weight being 10000 dalton and then using the 0.22mu m microfiltration membrane for filtration, collecting the filtrate and freeze drying the filtrate, thus obtaining the freeze-dried powder injection of potassium sodium dehydroandroan drographolide succinate.

The invention discloses a high-performance potassium sodium niobate-based leadless piezoelectric ceramic, expressed by a general formula of (1-x)(KNa)<c>Li<d>(Nb<e>Ta<f>Sb<g>)O3 - xBaZrO3, wherein a, b, c, d, e, f and g are molar fractions, a is greater than 0.35 and not greater than 0.6, b is greater than 0.35 and not greater than 0.6, c is greater than 0.92 and not greater than 0.99, d is greater than 0 and not greater than 0.25, e is greater than 0.74 and not greater than 0.89, f is greater than 0.1 and not greater than 0.3, and g is not less than 0.01 and less than 0.3; and x represents the molar percentage of BaZrO3 for (KNa)<c>Li<d>(Nb<e>Ta<f>Sb<g>)O3, and x is not less than 0 and not greater than 30%. Additionally, a preparation method for the high-performance potassium sodium niobate-based leadless piezoelectric ceramic is further disclosed. The high-performance potassium sodium niobate-based leadless piezoelectric ceramic and the preparation method for the same disclosed by the invention remarkably improve the piezoelectric properties and dielectric properties of ceramic material, thereby obtaining dielectric material excellent and stable in performances; and the high-performance potassium sodium niobate-based leadless piezoelectric ceramic can completely replace traditional lead-based piezoelectric ceramic in application, as well as has important practical significance and social benefits.

The invention discloses a preparing method of a potassium sodium niobate (KNN) piezoelectric nanofiber flexible electricity generating element. According to the method, the preparation of a KNN precursor is provided; KNN nanofiber is prepared in a large area by an electrostatic spinning method; and the KNN nanofiber transfer and the device assembly are carried out, and the KNN piezoelectric nanofiber flexible electricity generating element is obtained. The preparing method has the advantages that excellent lead-free piezoelectric materials are adopted; the KNN nanofiber is used for forming the flexible piezoelectric electricity generating element; the element can be enabled to have high electric output; the length-diameter ratio of the nanofiber prepared by the electrostatic spinning method is high; the nanofiber crystallization can be realized through sintering treatment; equipment and preparation processes are simple; the cost is low; the preparing method can be used for batch production of the elements; the mechanical deformation of the nanofiber under the specific external force effect can be improved through good flexibility of the element; and the collection efficient of the element on mechanical energy is improved.

The invention belongs to the chemical field of inorganic salts, in particular to a preparation method of high-purity anhydrous lithium chloride; wherein, sodium hydroxide and barium chloride are added into the high-potassium sodium brine containing lithium chloride which is used as a raw material; the mixture is stirred and filtered to eliminate a great amount of Mg 2 <+> and SO 4 <2->; and the micro Mg 2 <+> and the SO 4 <2-> can be eliminated by adding sodium carbonate into the mixture, and then is filtered to get a refined mother liquid. The refined mother liquid can be evaporated and filtered to eliminate potassium chloride and sodium chloride; and high-potassium mixed salt containing 60 to 95 percent of lithium chloride can be achieved by spraying and drying the refined mother liquid. After adding low-carbon organic solvent, the high-potassium mixed salt is stirred to extract lithium chloride and filtered to eliminate potassium sodium salt. High-purity anhydrous lithium chloride with the purity of over 99.5 percent can be achieved by depressurizing and distilling the mother liquid. The invention is applicable to the extraction art of the lithium chloride used in all present low-magnesium salt lakes containing lithium, and the extraction process of the lithium chloride from the mother liquid achieved after pressing solid lithium ore. The invention not only has the advantages of simple process and low cost, but also is easy to be operated and used in industrialization and has no three-waste pollution.

The invention relates to potassium-sodium niobate based leadless piezoelectric ceramic and a preparation method thereof and belongs to the field of functional ceramic materials. The chemical formula of the ceramic is as follows: (ABO3)1-x(BaZrO3)y(MnO2)y. The preparation method is as follows: K2CO3, Na2CO3, Nb2O5, Bi2O3, Li2CO3, TiO2, BaCO3, ZrO2 and MnO2 are mixed, absolute ethyl alcohol is added, the mixture is subjected to ball milling and dried, then mixed powder is obtained, and the powder is pre-sintered; absolute ethyl alcohol is added to the sintered powder, the mixture is subjected to ball milling again and dried, and mixed powder is obtained; the mixed powder is subjected to cold press molding, rough ceramic blank is obtained and sintered, and a ceramic sample is obtained; the ceramic sample is subjected to polarization treatment, and the potassium-sodium niobate based leadless piezoelectric ceramic is obtained. The prepared potassium-sodium niobate based leadless piezoelectric ceramic has excellent piezoelectric performance and temperature stability.

The present invention relates to one kind of sodium-potassium andrographolide-semisuccinate and its preparations. On the basis of potassium andrographolide-semisuccinate, which is not enough stable and is likely to produce precipitate and negative effect, sodium-potassium andrographolide-semisuccinate is developed and has relatively high stability and less side effect. The sodium-potassium andrographolide-semisuccinate is prepared into injection, powder for injection and other forms.