74 results about "Strontium hydroxide" patented technology

The invention relates to a phase transition temperature adjusting cup, which comprises a cup body outer casing, a cup body inner casing and a top cover, and the composite phase transition material is filled between the inner casing and the outer casing. The composite phase transition material comprises phase transition material, a nucleating agent, heat conduction filling material and a thickening agent. The phase transition material is selected from one or more of sodium acetate trihydrate, sodium thiosulfate pentahydrate, twelve disodium hydrogen phosphate, sodium sulfate decahydrate and decahydrate. <{EN4}>The nucleating agent is selected from one or more of borax, sodium phosphate dibasic anhydrous, diatomaceous earth, silica, sodium silicate, eight water strontium hydroxide, hexahydrate chloride strontium. <{EN5}>The heat conduction filling material is selected from one or more of graphite, carbon nanotube, expanded graphite, carbon fiber, graphene, three-dimensional graphite foam, silicon carbide, copper powder. <{EN6}>The thickening agent is selected from one of polyacrylic acid emulsion or carboxymethylcellulose sodium. <{EN7}>Compared with existing temperature adjusting cups, the phase transition temperature adjusting cup of the present invention has the advantages of rapid cooling, simple structure convenient operation, 3-4 hours of comfort temperature zone, and not being restricted from external environment.

The invention relates to a preparation method of secondary alcohol ethoxylate. According to an adopted technical scheme, the method includes the steps of: in the presence of an acidic catalyst, reacting secondary alcohol with ethylene oxide to obtain a secondary alcohol ethoxylate crude product; mixing a first treatment agent with the crude product to obtain an intermediate material I; mixing a second treatment agent with the intermediate material I to obtain an intermediate material II; filtering the intermediate material II to obtain filtrate; mixing the filtrate with water, conducting standing layering above the turbidity point of secondary alcohol ethoxylate to obtain an oil phase; and removing impurity water from the oil phase, thus obtaining a refined secondary alcohol ethoxylate product. Specifically, the first treatment agent is selected from at least one of lithium hydroxide, calcium hydroxide, calcium oxide, calcium carbonate, barium hydroxide, barium oxide, magnesium oxide, magnesium hydroxide, strontium hydroxide and strontium oxide; and the second treatment agent is selected from at least one of potassium hydroxide, sodium hydroxide, sodium methoxide, potassium methoxide, sodium ethoxide and sodium carbonate.

The invention relates to a purification method for strontium carbonate, belonging to the technical field of chemical industry. According to the method, industrial strontium carbonate is used as a raw material; barium and iron impurities are removed from strontium carbonate successively and high purity strontium hydroxide crystals are obtained after three times of crystallization; then the high purity strontium hydroxide crystals are dissolved at a constant temperature; food grade carbon dioxide is blown into the dissolved crystals at a constant speed for a synthesis reaction so as to obtain strontium carbonate slurry; and the strontium carbonate slurry undergoes filtration, drying at a constant temperature, crushing and screening so as to obtain desired calcium carbonate. Compared with traditional production processes for strontium carbonate by using an ammonium bicarbonate method, the purification method provided in the invention has the following advantages: produced effluent is deionized water, which enables pollution of ammonia nitrogen to environment to be avoided; process flow is simple and controllable, and the whole process is carried out in a closed environment, thereby preventing external pollution powder; and finally prepared strontium carbonate has a small particle size, good dispersibility, high purity and activity, etc., and can meet increasingly strict requirements of electronic ceramic elements.

The invention relates to a collinear preparation method for strontium hydrate and strontium carbonate, which comprises the following steps: A, performing hot leaching on a SrS clinker aggregate at the temperature between 75 and 95DEG C, and controlling the concentration of SrS solution in a range between 70 and 110g/L; B, sealing the SrS solution, stirring, and cooling to a temperature of between 30 and 45DEG C for suction and filtration separation to obtain Sr(OH)2 8H2O solid; C, dissolving the Sr(OH)2 8H2O solid with water, adding H2O2, heating to boil for 15 to 30 minutes, and filtering; D, sealing the obtained filter liquor, cooling to a temperature of between 35 and 45DEG C, performing centrifugal dehydration, and separating out crystal Sr(OH)2 8H2O; and E, carbonizing mother liquor remained in the step D with CO2 at the temperature of between 75 and 85DEG C to obtain SrCO3. The method for preparing the strontium hydrate and the strontium carbonate has low cost, and no introduction of other metal ions.

The invention discloses a cooling crystallizer for producing strontium hydroxide. The cooling crystallizer comprises a tank, a blocking plate, a feeding pipe and a tank cover, wherein the blocking plate is arranged at the bottom end of an inner cavity of the tank, and the right side of the blocking plate penetrates the tank; the tank cover is mounted at the top end of the tank, the feeding pipe ismounted on the left side of the top end of the tank cover, a first motor is mounted at the center of the top end of the tank cover, and a rotating shaft is mounted at the bottom end of the first motor. According to the cooling crystallizer for producing strontium hydroxide, the inner wall of the tank can be cleaned by scrapers, and a material is prevented from being attached to the inner wall ofthe tank after crystallization; during cleaning, a water pump can be started to convey water into a ferrule from a water storage tank through a conveying pipe, the water flows into a ring through a circular groove and second through holes, flows into rectangular plates through a rotating shaft and stirring rods, and is spray out through the second through holes to clean the inner wall of the tank,and accordingly, heat exchange capacity between the tank and the outside is improved, and the crystallization effect is improved.

There is provided a chromium-free coating composition for forming an insulation film, the composition having excellent corrosion resistance and excellent film adhesion and film strength after stress relief annealing (SRA), including, based on a 100 g phosphate solution having a solid content of 60% by weight, in which monoaluminum phosphate and monozinc phosphate are mixed at a 1:1 ratio: 0.5˜5 g of a solid in which cobalt hydroxide and strontium hydroxide are mixed at a 1:1 ratio: 100˜300 g of an emulsified polyester resin or an emulsified epoxy resin having a solid content of 20% by weight; 3˜10 g of aluminum silicate having a solid content of 20% by weight; and 0.1˜6 g of a titanium chelate.

The invention discloses a preparation method for high-purity strontium carbonate. The preparation method comprises the steps of adding a bicarbonate solution into a solution in which strontium hydroxide and a surfactant are dissolved through a multi-region material feeding type reaction kettle, performing stirring reaction for certain time, centrifugating products obtained in the reaction, leaching solids with a detergent, and roasting the solids by adopting an on-line temperature gradient control dynamic roasting technology to obtain the high-purity strontium carbonate. According to the preparation method disclosed by the invention, the strontium hydroxide and bicarbonate which do not contain chlorides are used as raw materials, so that the existence of the chlorides in the reaction products is avoided; meanwhile, due to the action of the surfactant which is added before precipitates are produced, a multi-point material feeding reaction mode and the on-line temperature gradient control technology of a roasting furnace, the problem of aggregation of the precipitates can be solved, and the digestion time of the precipitates is fully shortened; crystal residues and impurity residues are prevented in the precipitate crystallization process; the conversion of the products from rod-type structures into spherical crystal structures is realized; the uniformity of the particle sizes of the products is improved.

The invention fully considers the characteristics of the slag produced by using the thermite method to prepare metal strontium, and provides a method for recovering strontium oxide to prepare strontium chloride under low-acid and low-temperature conditions. That is, strontium metal slag is pulverized to obtain strontium slag slurry, acidified with hydrochloric acid and barium removed with sulfuric acid, and the pH value of the solution is controlled to be greater than 3.5 during the reaction, which can inhibit the dissolution of aluminum, and then use hydrogen peroxide to oxidize ferrous ions; Strontium hydroxide adjusts the pH value of the solution so that aluminum and iron ions are flocculated, and finally the solution is filtered and then concentrated and crystallized to obtain the strontium chloride product. The pH value of the reaction solution is greater than 3.5, the reaction temperature does not exceed 50° C., and the operating environment is good. The production process is simplified. The waste slag generated by the method is mainly available alumina, which solves the pollution problem.

A process for synthesizing the nanometre-class perovskite ceramic powder under the conditions of temp. lower than boiling point of substrate liquid and normal pressure includes such steps as directlymixing the substrate liquid which is the aqueous solution of barium hydroxide, strontium hydroxide, calcium hydroxide and lead hydroxide with the solution of metallic alkoxide in organic solvent, adding precipitant and disperser, and drying the deposit. Its advantages are high sintering activity, uniformity and stability of Ba/Ti rate, and cubic perovskite structure.

The invention discloses a method for preparing strontium chloride by using strontium slag. The method specifically comprises the following steps: (1), firstly grinding the strontium slag into powder, then sieving the ground strontium slag through a 100-mesh sieve; (2), adding hydrochloric acid in the sieved strontium slag powder, wherein the weight ratio of hydrochloric acid to the strontium slag powder is 1.25:1; then stirring, reacting for 2-4h, filtering to obtain supernate after the reaction is ended; (3), adding sulfuric acid in the supernate prepared in the step (2), stirring, and reacting for 1-2h; (4), after the reaction is ended, adding strontium hydroxide in the solution, regulating pH of the solution to 6.5-7.5, standing, and filtering to obtain filtrate after completely settling; and (5), heating, evaporating and crystallizing the filtrate obtained in the step (4) to obtain the strontium chloride. The method provided by the invention has the advantages of simplicity, low requirement on equipment, safety, environment friendliness, high yield, and the like.

The invention discloses a method for one-step microwave synthesis of La-Cr co-doped strontium titanate nanoparticles. With strontium hydroxide, titanium dioxide P25 and potassium hydroxide as raw materials and with La(NO)3.6H2O and Cr(NO)3.9H2O as dopants, the La-Cr co-doped strontium titanate nanoparticles with uniform morphology are synthesized by a microwave method, the shortcomings of a solid phase method and a hydrothermal method are overcome, and thus the preparation reaction time is greatly shortened, and the sample grain size can be adjusted and controlled.

The invention provides a strontium/graphene composite material, which comprises a strontium compound and graphene, the strontium compound being selected from strontium hydroxide or strontium sulfide. The strontium/graphene composite material prepared through a hydrothermal method serves as an electrode material of a supercapacitor, and such material not only has good electrochemical performance, but also has higher specific capacitance and longer cycle life. The experiment result shows that the specific capacitance of the supercapacitor electrode material made from the strontium/graphene composite material prepared through the hydrothermal method can reach 10-1500F/g, and after constant-current charging and discharging for 3000 times, the specific capacitance thereof can still remain more than 98.5%.

The invention provides a method for preparing high-purity electronic grade strontium carbonate. The method comprises the following steps: dissolving strontium chloride into deionized water; adding mixture of strontium hydroxide accounting for 3 to 5 percent of the strontium chloride by weight and microbial flocculating agent MBFA9 into the deionized water; filtering the solution and removing impurities of the solution to be prepared into a strontium chloride with water for standby; slowly flowing a sodium hydroxide solution into the strontium chloride solution to react; pumping obtained strontium hydroxide solution into a carbonization reactor, and introducing pure carbon dioxide into the reactor to be carbonized to obtain strontium carbonate pulp; and drying and crushing the strontium carbonate pulp to obtain strontium carbonate powder. Compared with the prior process for producing the strontium carbonate, the method not only saves investment of high-temperature calcination equipment in production, but also greatly reduces energy consumption and pollution to environment, simplifies and optimizes production process, shortens reaction time, and ensures that the prepared strontium carbonate powder has the advantages of good dispersivity, high purity and the like.

The invention discloses a method for preparing high-purity strontium dihydroxide by utilizing strontium slag. The method comprises the steps: (1) grinding the strontium slag; (2) dissolving the ground strontium slag and adding mixed solution of sulfuric acid and hydrochloric acid, and performing filtration to obtain liquid first solution; (3) adding sodium hydroxide solution into the first solution, performing filtering separation of sediment after the heating, and obtaining liquid second solution; (4) adding solid strontium dihydroxide into the second solution, performing heating to 40-70 DEG C and then maintaining constant temperature for 0.5-2 h, performing filtering separation of sediment, and obtaining strontium chloride solution; (5) using deionized water to dilute the strontium chloride solution and then adding sodium hydroxide solution to perform alkali decomposition, and filtering the precipitated crystal to obtain coarse strontium hydroxide crystal; (6) recrystalizing the coarse strontium hydroxide crystal, and obtaining high-purity strontium dihydroxide crystal. According to the method, tailing resources are utilized, the strontium ore utilization rate is improved, and the environmental pollution caused by tailings is reduced.

The invention discloses an electrolyte for in-situ growth of a barium strontium titanium ferroelectric film on the surface of a titanium substrate and a preparing method of the film. The electrolyte is prepared from barium hydroxide with the concentration of 0.2 mol/L-0.8 mol/L or barium hydroxide with the concentration of 0.2 mol/L-0.8 mol/L, strontium hydroxide with the concentration of 0.2 mol/L-0.8 mol/L or strontium hydroxide octahydrate the concentration of 0.2 mol/L-0.8 mol/L, and an additive, namely ethylene diamine tetraacetic acid (EDTA) with the concentration of 0.01 mol/L-0.1 mol/L. According to the electrolyte, the components are simple, the stability is good, and the requirement for environment protection is met. The film preparing technique is simple and can be implemented at normal temperature, film forming speed is high, and the smooth and compact barium strontium titanium ferroelectric film having a good ferroelectric property can be obtained without post heat treatment.

The invention discloses a method for converting water into oil through high-density 6He, 3He and 4He cluster, which comprises the following steps: 1. preparing a porphyrin solution containing 5 percent of deuterium; 2. adding strontium hydroxide, bromine and iodine; 3. deoxidizing water; 4. making 4He in the water of an outer glass utensil be in an over-saturation state; 5. obtaining a certain number of 6He; 6. obtaining a certain number of muons; 7. synthetizing a porphyrin Hemu solution; 8. making the 4He reach the over-saturation state in the porphyrin solution; removing a system for circularly conveying 6He mixed gas, and sealing a hatch cover above the outer glass utensil; 9. adding the deoxidized water to a nested glass utensil, and regulating the injection speed of the water and the output speed of the oil; 10. periodically supplementing the porphyrin solution containing 5 percent of deuterium and exposing porphyrin by using muon beams; 11. preparing large amount of 6He by using 6Li powders; and 12. replacing 6Hemu and 4Hemu with 76Br atoms containing superdeformed halo nuclei 76Br.

The invention discloses a preparation method of strontium carbonate. The preparation method comprises following steps: at a certain temperature, in a reaction vessel I, strontium hydroxide is dissolved in high purity water via stirring, and ammonium hydrogen carbonate in a reaction vessel II is heated; obtained gas CO2 and NH3 are delivered into the reaction vessel I, and a dispersant is added dropwise into the strontium hydroxide solution at a certain speed; an obtained mixture is stirred using a stirrer for reaction at a certain temperature; and an obtained reaction product is subjected to centrifugation, leaching, and roasting so as to obtain strontium carbonate. According to the preparation method, strontium hydroxide and ammonium hydrogen carbonate are taken as raw materials; gas-liquid reaction is adopted; no by-product is obtained; and in addition, the dispersant is added dropwise in reaction processes, and roasting at different temperature is adopted, so that stability of crystal structures and product purity are ensured.

The invention discloses a preparation method of a lithium nickel manganese oxide positive electrode material coated with a strontium titanate-based conductive coating. The preparation method comprises the following steps: weighing strontium salt or strontium hydroxide, titanium salt and a third metal salt according to a molar ratio of 1: 1: X; adding strontium salt or strontium hydroxide, titanium salt and a third metal salt into a certain amount of triethylene glycol, and heating to dissolve to obtain a solution A; weighing a lithium nickel manganese oxide positive electrode material; heating and stirring the mixed solution, adding a lithium nickel manganese oxide positive electrode material into the mixed solution A, adding a suspending agent at the same time, and mechanically stirring to obtain a mixed turbid liquid B; adding a precipitant into the mixed suspension B while stirring; continuously stirring the mixed turbid liquid in the step (5), filtering, washing and drying the mixed turbid liquid to obtain the lithium nickel manganese oxide positive electrode material containing the strontium titanate-based conductive coating. According to the invention, the lithium nickel manganese oxide positive electrode material has better specific discharge capacity, and the discharge capacity of the lithium nickel manganese oxide positive electrode material can be maintained or improved.

The invention relates to a method for preparing strontium hydroxide octahydrate granular crystals, which includes steps: forging celestine and coal before leaching, obtaining crude strontium hydroxide octahydrate by chemical combination of the solution and sodium hydroxide, and recrystalizing the crude strontium hydroxide octahydrate at a certain temperature to obtain high-purity strontium hydroxide octahydrate granular crystals. Particles with diameter larger than 1000 micrometers account for more than 55% of the strontium hydroxide octahydrate granular crystals prepared by recrystalizing at temperature ranging from 72 DEG C to74 DEG C, the prepared strontium hydroxide octahydrate granular crystals are high in purity and low in impurity content. The conversion rate of Sr2+ in the celestine into strontium hydroxide is 100%, and economic benefit of the process is improved since the Sr2+ is converted into the strontium hydroxide to the greatest extent and the selling price of the strontium hydroxide is higher than that of the strontium carbonate.

A treatment method for reducing the leachability of selenium contained in a sodic fly ash which is provided by a combustion process when a sodium-based sorbent comes in contact with a flue gas generated by combustion to remove at least a portion of pollutants contained in the flue gas. The method comprises: (a) contacting the sodic fly ash with at least one additive in the presence of water; and (b) drying the material (preferably a paste) from step (a) to form a dried matter. The additive may comprise at least one strontium-containing compound, at least one barium-containing compound, dolomite, a dolomite derivative such as calcined or hydrated dolomite, at least one silicate-containing compound, or any combinations of two or more thereof. A particularly suitable additive may comprise strontium chloride, strontium hydroxide, pulverized dolomitic lime, sodium silicate, or any combinations of two or more thereof.

The invention belongs to the technical field of exhaust-gas purification and discloses a TX-GF-JH-6 type boron trichloride and boron hexafluoride exhaust-gas purification absorbent. The TX-GF-JH-6 type boron trichloride and boron hexafluoride exhaust-gas purification absorbent comprises, by weight, 70% of strontium hydroxide, 28% of calcium hydroxide and 2% of epoxy resin. The method includes the steps of S1, selection of raw materials; S2, smashing and vibration mill; S3, raw material weighing; S4, kneading; S5, extrusion; S6, drying; S7, capability test; S8, product packing. The TX-GF-JH-6 type boron trichloride and boron hexafluoride exhaust-gas purification absorbent is simple in formula, chemical adsorption is derived from traditional physical adsorption of activated carbon, and harmless calcium salt, inorganic salt and the like which are stable are generated after adsorption reaction with corresponding gases; the absorbent can be directly used in road repairing, pit filling, refuse dumping and the like, secondary pollution cannot caused, simpleness in production technology is achieved, and effect can be well achieved.

The invention discloses a method for preparing a steady-persistence luminous ceramic membrane through magnesium or magnesium alloy surface micro-arc oxidation. The method comprises the steps that 1, an electrolytic solution is prepared by taking water as a solvent, uniformly stirred and then put into an electrolytic bath; and 2, to-be-treated magnesium or a to-be-treated magnesium alloy is put into the electrolytic solution to serve as an anode; a stainless steel plate serves as a cathode; and the uniform steady-persistence luminous ceramic membrane is grown on the surface of magnesium or the magnesium alloy. According to the method, strontium hydroxide and lauryl sodium sulfate are added to the micro-arc oxidation electrolytic solution, strontium hydroxide can react on the surface of magnesium or the magnesium alloy to be converted into a fluorescent substance, namely strontium aluminate in a micro-plasma arc discharge process during micro-arc oxidation treatment, and strontium aluminate sinters with the ceramic membrane at the moment of high energy reaction into a whole to become one of components in the ceramic membrane, so that the ceramic membrane has the steady-persistence luminous characteristic, and has the advantages of tight combination and uneasiness in falling.

The invention provides a method for preparing a SrNb2O6 (strontium niobate)/SrCO3 (strontium carbonate) composite nanometer material. The method comprises the following steps of using a SnNb2O6 nanometer material as a raw material; performing hydrothermal reaction in a mixed alkaline solution of potassium hydroxide and strontium hydroxide under the condition of existence of CO2 (carbon dioxide). The method provided by the invention has the advantages that the repeatability is good, the operation is simple, and the method is suitable for quantity production; the cost is greatly reduced, and theefficiency is improved. The prepared strontium niobate/strontium carbonate composite nanometer material has the advantages that the quality is stable; a better application prospect is realized in thefield of photocatalytic water treatment; the development of semi-stable state niobate crystallizing method is promoted, and the practical application study of the niobate is promoted.