252 results about "Selenium Oxide" patented technology

The invention provides a self-support transition metal selenide catalyst as well as a preparation method and application thereof, belongs to the field of alkaline full electrolytic tank water decomposition, and solves the technical problems that the existing catalyst is low in catalytic activity or the catalyst activity is limited by pH value. The preparation method of the self-support transition metal selenide catalyst comprises the following steps: dissolving selenium powder in a sodium borohydride aqueous solution, or adding metal salt of a transition metal element to obtain a mixed solution; then, adding a conductive substrate of the transition metal into the obtained mixed solution for reaction to obtain the self-support transition metal selenide catalyst; or preparing transition metal selenide electrolyte from the metal salt of the transition metal element, selenium dioxide and lithium chloride; then adopting the conductive substrate of the transition metal as a working electrode for carrying out electrodeposition in the obtained transition metal selenide to obtain the self-support transition metal selenide catalyst. According to the invention, the preparation method is free of pH influence, and the prepared selenide catalyst has excellent electro-catalysis hydrogen evolution and oxygen evolution performance when applied in a battery.

The invention relates to the fabrication of a resistance variable material cell or programmable metallization cell. The processes described herein can form a metal-rich metal chalcogenide, such as, for example, silver-rich silver selenide. Advantageously, the processes can form the metal-rich metal chalcogenide without the use of photodoping techniques and without direct deposition of the metal. For example, the process can remove selenium from silver selenide. One embodiment of the process implants oxygen to silver selenide to form selenium oxide. The selenium oxide is then removed by annealing, which results in silver-rich silver selenide. Advantageously, the processes can dope silver into a variety of materials, including non-transparent materials, with relatively high uniformity and with relatively precise control.

The invention provides glass powder, which comprises bismuth oxide 30wt%-70wt%, titanium oxide 1wt%-20wt%, zinc oxide 5wt%-40wt%, antimony oxide 5wt%-30wt% optional tellurium oxide 0wt%-30wt%, optional molybdenum oxide 0wt%-10wt% and selenium oxide 0wt%-15wt%. The invention also relates to a preparation method of the glass powder and conductive paste for solar cell prepared from the glass powder. The inventive glass powder contains no lead and boron, does no harm to the environment and can be used for preparing conductive paste for solar cell with high photoelectric conversion efficiency.

Techniques for electrodepositing selenium (Se)-containing films are provided. In one aspect, a method of preparing a Se electroplating solution is provided. The method includes the following steps. The solution is formed from a mixture of selenium oxide; an acid selected from the group consisting of alkane sulfonic acid, alkene sulfonic acid, aryl sulfonic acid, heterocyclic sulfonic acid, aromatic sulfonic acid and perchloric acid; and a solvent. A pH of the solution is then adjusted to from about 2.0 to about 3.0. The pH of the solution can be adjusted to from about 2.0 to about 3.0 by adding a base (e.g., sodium hydroxide) to the solution. A Se electroplating solution, an electroplating method and a method for fabricating a photovoltaic device are also provided.

The invention discloses a nano-selenium-containing amino acid foliar fertilizer and a preparation method thereof. The nano-selenium-containing amino acid foliar fertilizer is prepared from such raw materials as molasses, animal hair, selenium dioxide, sulfuric acid, copper sulfate, manganese sulfate, zinc oxide, ferrous sulfate, ammonium carbonate, ammonium molybdate, urea, potassium chloride, boric acid, fulvic acid, a surfactant, ethylene glycol, sodium carbonate, quick lime or calcium hydroxide, phosphoric acid and water. The preparation comprises the steps of reducing selenium dioxide by use of the molasses to obtain nano-selenium, hydrolyzing the animal hair into an amino acid solution, and then performing the reactions of neutralization, complexing, emulsification and the like to obtain the nano-selenium-containing amino acid foliar fertilizer. According to the nano-selenium-containing amino acid foliar fertilizer, the problem of transforming inorganic selenium into nano-selenium and the problem of recycling waste both are solved; the fertilizer is capable of improving the water retention and drought resisting capability of plants and increasing the content of the organic selenium element content in crops; the preparation method of the fertilizer is mild in reaction conditions, simple in process, relatively low in production cost and prone to industrial production, and has excellent economic benefit, social benefit and ecologic benefit.

The invention relates to a fluorescent probe, wherein, the fluorescence is enhanced in the presence of ONOO-, and the fluorescence returns to original state in the presence of reducing matter. The invention provides a reversible fluorescent probe for selective detection of ONOO- in cells, characterized in that: cyanine dye is used as the fluorescent matrix, an organic selenide structure is introduced in the cyanine matrix as the active site of the reaction with ONOO- to realize the selective detection of ONOO-; the properties that organic selenium oxide formed by oxidizing organic selenide is easy to be reduced to organic selenide by reducing micromolecules in biosystem, such as cysteine, reducing glutathione, metallothionein and the like, is utilized to realize the reversibility of the probe molecules; and variations of electronic properties of organic selenide before and after the oxidation and the influence of the variations on the fluorescence property of the whole compound are utilized simultaneously to modulate the fluorescence property of the probe molecules.

The invention relates to organic biological feed additives containing nano selenium and zinc oxide, a preparation method and a use method. The product of the organic biological feed additives is russety dry powder with a granularity between 80 and 140 nanometers, and can form suspension with water; the selenium content is between 0.00 and 36.00 percent and the zinc content is between 0.00 and 45.00 percent; the selenium content and the zinc content can not be 0 simultaneously; the organic biological feed additives are prepared by nano selenium organic biological intermediates and nano zinc oxide organic biological intermediates which are respectively prepared by fermentation of selenium dioxide and nano zinc oxide through microorganisms in the presence of various nutrient components; and 2.3 to 11.5 mass times of water is uniformly mixed with the organic biological feed additives containing the nano selenium and the zinc oxide and then sprinkled in feed which is then used for feeding laying hens, milk cows or nanny goats for 5 to 10 days. Compared with contrast feed, the selenium content and the zinc content of produced eggs are respectively 2 to 5 times and 2 to 2.5 times; the selenium content and the zinc content of produced milk are respectively 3 to 6 times and 2 to 4 times; and the selenium content and the zinc content of produced goat milk are respectively 3 to 7 times and 3 to 6.5 times.

The invention relates to the fabrication of a resistance variable material cell or programmable metallization cell. The processes described herein can form a metal-rich metal chalcogenide, such as, for example, silver-rich silver selenide. Advantageously, the processes can form the metal-rich metal chalcogenide without the use of photodoping techniques and without direct deposition of the metal. For example, the process can remove selenium from silver selenide. One embodiment of the process implants oxygen to silver selenide to form selenium oxide. The selenium oxide is then removed by annealing, which results in silver-rich silver selenide. Advantageously, the processes can dope silver into a variety of materials, including non-transparent materials, with relatively high uniformity and with relatively precise control.

The invention belongs to the technical field of nanometer material, relates to a synthetic method for preparing porous hollow nanospheres with uniform appearance through a hydrothermal process, and particularly relates to a preparation method of porous nickel selenide hollow nanospheres. The preparation method comprises the steps as follows: positioning selenium dioxide and nickel nitrate into alkaline aqueous solution of ammonia water; and preparing the porous hollow nanospheres through the hydrothermal process under the reduction effect of hydrazine hydrate. The nickel selenide hollow nanospheres prepared by the preparation method provided by the invention have the diameter of 300 to 400nm, and are formed by self-assembling 30 to 50nm of porous nickel selenide. The preparation method provided by the invention is simple in technology, and high in repeatability; and the used nickel source and selenium source are the inorganic compounds, low in cost, easy to obtain, low in cost, and meets the environment-friendly requirement; the method can be conducted without pre-processing such as ageing and roasting; the resultant temperature is low, therefore, the energy consumption and the reacting cost are reduced; and the mass production can be conveniently conducted.

The invention provides a method for preparing a chlorinated 2-benzoyl-1,10-phenanthroline condensed amine iron (II) complex shown in formula I, and its catalytic application in ethylene oligomerization. The preparation method comprises the following steps: orderly performing hydrolysis and an oxidation reaction with nitrobenzene of initial reaction raw materials of 1,10-phenanthroline and benzyl lithium to obtain 2-benzoyl-1,10-phenanthroline, then performing condensation of 2-benzoyl-1,10-phenanthroline with substituted aniline to obtain 2-benzoyl-1,10-phenanthroline condensed amine ligand, and reacting the ligand with ferrous chloride to obtain a target product I. The synthetic method provided by the invention is few in steps, and simple in process, substitutes nitrobenzene for selenium dioxide in the prior art for the oxidation reaction, substitutes nontoxic benzyl lithium for hypertoxic potassium cyanide in the prior art, reduces the preparation cost of the catalyst, and has wide industrialization prospects.

The invention discloses a preparation method and application of a foamed nickel-based Ni3Se2 nano material. According to the preparation method and application of the foamed nickel-based Ni3Se2 nano material of the invention, foamed nickel is adopted as a nickel source and a base material at the same time, selenium dioxide is adopted as a selenium source, and one-step solvothermal method is adopted to prepare a vertically-arranged Ni3Se2 nano material of a dendritic structure; the Ni3Se2 nano material, without any other subsequent processing required, can be directly applied to a dye-sensitized solar cell. The foamed nickel-based Ni3Se2 nano material prepared by using the preparation method provided by the invention is of a three-dimensional porous mesh structure, so that the diffusion of an electrolyte can be benefitted; the foamed nickel-based Ni3Se2 nano material is also of a vertically-arranged dendritic structure, more electrocatalytic active sites are provided, so that rapid and direct transfer of electrons can be benefitted; and therefore, the photoelectric conversion efficiency of the dye-sensitized solar cell with the Ni3Se2 nano material adopted as a counter electrode is close to the efficiency of a dye-sensitized solar cell with a traditional platinum electrode adopted as a counter electrode. The preparation method is simple in preparation process, easy in operation, easily available and low-toxicity in raw material and low in cost, and therefore, the overall cost of the dye-sensitized solar cell can be decreased.

The invention relates to a method for extracting manganese metal from vanadium precipitation wastewater and vanadium extraction tailings, belonging to the technical field of metallurgical and chemical industries. The method for extracting manganese metal from vanadium precipitation wastewater and vanadium extraction tailings comprises the following steps of (1) mixing vanadium precipitation wastewater and vanadium extraction tailings, heating to 60-80 DEG C, and carrying out solid-liquid separation after reacting by stirring to obtain a first filtrate and residues; (2) adding a reducing agent into the first filtrate to reduce pentavalent vanadium in the solution into tetravalent vanadium, and then, filtering to obtain a second filtrate; (3) adding an antioxidant into the second filtrate, and reacting at the temperature of 50-60 DEG C to oxidize the unreacted reducing agent in the step (2); (4) adding activated carbon or suspended matters or suspended particles in a polyacrylamide adsorption solution, and then, filtering after uniformly stirring to obtain a third filtrate; and (5) adding selenium dioxide or sulfurous acid into the third filtrate to electrolyze to obtain manganese metal and an electrolytic anode solution. The invention provides an effective approach for recovering manganese resources in the vanadium precipitation wastewater and the vanadium extraction tailings.

The invention discloses a nano-selenium containing soilless culture matrix and a preparation method thereof. The nano-selenium containing soilless culture matrix provided by the invention includes animal urine, crop straw, industrial and agricultural by-products, selenium dioxide, manufactured sand and other raw materials. Through mixing and fermentation of the animal urine, crop straw, industrial and agricultural by-products, and selenium dioxide, a nano-selenium containing decomposed organic matter can be obtained, and the decomposed organic matter and the manufactured sand are mixed to prepare the nano-selenium containing soilless culture matrix.

The invention discloses a CO2 / N2-H2O2 dual-stimulation response surfactant and a preparation method thereof. CO2 is introduced to a surfactant to form a bicarbonate cationic surfactant, N2 is introduced to decompose the surfactant to lose surface activity, H2O is added to the surfactant to oxidize in order to form a selenium oxide, vitamin C is added to reduce the selenium oxide into the initial surfactant, so the surfactant has CO2 / N2-H2O2 dual-stimulation responsiveness.

The invention relates to a composition for eliminating the interference of a calcium dobesilate medicine on creatininase-method detection. The composition comprises an R1 reagent, an R2 reagent and ahigh molecular oxidant, wherein the high molecular oxidant is one or more of high molecular peroxy acid, high molecular selenium oxide, high molecular sulfur chloride ether, N-substituted imide, water-soluble tetrazole and a Dess-Martin oxidant. The high molecular oxidant in the composition disclosed by the invention can react with the calcium dobesilate in a sample to be detected, the calcium dobesilate loses the effect of interfering enzyme-method creatinine detection and the accuracy of sarcosine-oxidase-method detection is improved, so that the problem of serious negative interference, caused by high-concentration calcium dobesilate in blood of a patient, on an enzyme-method creatinine project detection result when the patient orally takes the calcium dobesilate medicine is solved.

The invention discloses a method for spontaneously growing Au nanometer particles on an electro-deposited CdSe film. Mixed solution of divalent cadmium salt and selenium dioxide (SeO2) is used; firstly, CdSe is deposited on the surface of an electrode by using an electro-deposition method to form a carrier film; the electrode is dipped in Au nanometer particle growth liquid for growing by 1-3 hours in a constant-temperature water bath boiler; and finally, the electrode is taken out to spontaneously grow the Au nanometer particles. The method is simple in preparation steps; and the deposited composite film is strong in adhesive force, high in efficiency, low in cost and more suitable for large-scale production.

The invention relates to a method for comprehensively utilizing vanadium slag, belongs to the field of resource reclamation, and aims to solve the technical problem of providing the method for comprehensively utilizing the vanadium slag. The method comprises the following steps: a, acid leaching at oxygen pressure, namely at oxygen pressure, adding sulfuric acid into the vanadium slag, stirring and filtering to obtain leaching liquid and leaching slag; b, leaching liquid extraction, namely regulating the pH value of the leaching liquid, and extracting to obtain extraction liquid and raffinate; c, vanadium-containing solution preparation, namely carrying out back extracting on the extraction liquid to obtain subnatant which is the vanadium-containing solution; d, electrolytic manganese preparation, namely regulating the pH value of the raffinate, adding ammonium sulfate and selenium dioxide, and electrolyzing to obtain the electrolytic manganese; and e, titanium dioxide preparation, namely adding sulfuric acid into the leaching slag which is obtained in the step a to perform secondary acid leaching, heating, reducing, freezing, crystallizing, filtering, hydrolyzing, filtering, washing, evaporatively crystallizing and calcining to obtain the titanium dioxide. The method can be used for comprehensively reclaiming and recycling vanadium slag.

The invention discloses an efficient light-emitting sulfur selenium tellurium zinc cadmium / zinc sulfide quinary alloy core-shell structure quantum dot material and a preparation method. Liquid paraffin serves as a solvent, powdered sulfur serves as a sulfur source, selenium oxide powder serves as a selenium source, tellurium oxide serves as a tellurium powder source, zinc oxide serves as a zinc source, cadmium oxide serves as a cadmium source, liquid organic amine, liquid organic acid and liquid mercaptan serve as stabilizers, and heating reaction is performed in inert gas atmosphere to prepare an inner core of a sulfur selenium zinc cadmium telluride quinary alloy core. The liquid organic amine serves as a solvent, alkyl sulfhydryl serves as a sulfur source, zinc fatty acid serves as a zinc source, and heating reaction is performed in the inert gas atmosphere to grow a zinc sulfide shell. ZnCdSSeTe / ZnS quinary alloy core-shell structure quantum dots with adjustable light-emitting peakpositions, uniform shapes and sizes and high fluorescence quantum yield are controllably prepared by low-cost reaction raw materials and reaction solvents.

The invention discloses a selenium-rich water mineralization agent as well as application and a preparation method thereof. The selenium-rich water mineralization agent is characterized by comprising the following components by weight percent: 78%-99.8% of inorganic calcium salt or calcium hydroxide, 0.1%-8% of elemental selenium or selenium oxide, 0-7% of inorganic zinc salt or zinc oxide and 0-7% of inorganic strontium salt or strontium oxide. The selenium-rich water mineralization agent is widely applied to the fields of water mineralization, selenium-rich characteristic agriculture and the like; the selenium-rich water mineralization agent has the characteristics of slowly releasing selenium element and releasing a certain amount of calcium element; zinc and / or strontium element can be selectively released by the selenium-rich water mineralization agent; therefore, a cheap, convenient and fast way is provided for supplementing selenium and calcium.

The invention discloses a nano MoO2-MoSe2@SFC lithium ion battery negative electrode material and a preparation method therefor. A nano MoO2-MoSe2@SFC composite material takes sisal fiber carbon (SFC) with a hierarchical pore-shaped structure as a substrate material, and MoO2 and MoSe2 are uniformly dispersed in the surface and pores of the SFC. Ammonium molybdate tetrahydrate, ammonium molybdate dehydrate or molybdenum dioxide is taken as a molybdenum source; selenium dioxide, sodium selenite or selenium powder is taken as a selenium source; carbonized, ball-milled and sieved SFC is taken as a substrate material; hydrazine hydrate and polyethylene glycol 400 are used as a reductant and a dispersant respectively; a hydrothermal reaction is performed by utilizing a high-pressure reaction kettle; and dispersoid materials with different particle sizes can be obtained by changing different reaction conditions. The obtained nano MoO2-MoSe2@SFC composite powder is relatively high in reversible capacity, relatively stable in cyclic performance and relatively high in charging / discharging rate performance when being used as the lithium ion battery negative electrode material, so that the nano MoO2-MoSe2@SFC composite powder has relatively good application prospects.

The invention belongs to the technical field of preparation of trans-menthyl-2, 8-diene-1-ol, and particularly relates to a synthesis process of trans-menthyl-2, 8-diene-1-ol. The synthesis process comprises the following steps: (1) taking limonene as a raw material, and carrying out lipase catalytic oxidation to prepare 1, 2-epoxy limonene; (2) ring-opening the 1, 2-epoxy limonene in the presenceof sodium borohydride and diphenyl diselenide to form limonene selenide; (3) forming selenium oxide under the action of an oxidizing agent by the limonene selenide and then carrying out elimination reaction to prepare the trans-menthyl-2, 8-diene-1-ol. According to the invention, the 1, 2-epoxy limonene is firstly prepared by a lipase catalysis method with high chiral selectivity, the purity of areaction intermediate is improved without a complex purification process, and the chiral purity of the final product trans-menthyl-2, 8-diene-1-ol is further improved.

The invention discloses a preparation method of a Fe (Se, Te) superconducting wire. The method comprises the following steps of 1, grinding iron powder, selenium powder, tellurium powder, silver powder and selenium dioxide powder; 2, pressing to obtain a doped Fe-Se-Te green body; 3, sintering the doped Fe-Se-Te green body to obtain a Fe (Se, Te) superconducting material block body; 4, performing high-energy ball milling to obtain Fe (Se, Te) superconducting powder; and 5, loading the Fe (Se, Te) superconducting powder into a tube, and sintering to obtain the Fe (Se, Te) superconducting wire. The method is advantaged in that silver and oxygen co-doping is formed in the raw material powder by adopting a chemical co-doping method, the Fe (Se, Te) grain boundary connectivity is enhanced through the silver element, the interstitial iron content in Fe (Se, Te) crystal lattices is reduced in combination with the oxygen element, the superconducting performance of the Fe (Se, Te) superconducting wire is synergistically improved, and two problems of grain boundary connectivity and interstitial iron of the FeSe-based superconducting wire are solved.

The invention relates to a method for coloring copper and copper alloy with a gun color. The method comprises the following steps: (1) pretreatment: performing alkali chemical oil removal on copper and alloy pieces to be colored, removing oil stains from the surfaces of the plated pieces, neutralizing, cleaning and drying; (2) chemical polishing: performing two steps of chemical polishing, namely soaking into a polishing solution for polishing for 1-5 minutes and then performing film removal polishing; (3) weak base neutralization: neutralizing residual acid in the polished plated pieces, or micro-etching zinc and exposed copper on the surface of metal with weak base; (4) coloring with the gun color: putting the plated pieces into 20-120g / L of copper sulfate pentahydrate CuSO4.5H2O, 3-50mL / L of concentrated sulfuric acid H2SO4, 1.0-12g / L of selenium dioxide SeO2, 10-80g / L of ammonium persulfate (NH4)2S2O8, 10-100mg / L of inorganic blackening agent and 0.5-80mg / L of polyethylene glycol (P-6000), coloring for 0.5-8 minutes at normal temperature, taking out, neutralizing acid with 5% NaCO3 solution, previously fixing color, washing and drying; (5) passivation: soaking into 2% benzotriazole BTA solution for passivation, washing and drying; and (6) fat liquoring and baking: liquoring fat and baking for 1-5 minutes at 110 DEG C.

The invention discloses a preparation method of an amorphous CoMoS4 / NiSe nanosheet array composite material, which comprises the following steps: (1) under hydrothermal conditions, cobalt nitrate hexahydrate reacts with sodium molybdate heptahydrate, and a CoMoO4 nanosheet array is grown on foam nickel; (2) sodium sulfide and the CoMoO4 nanosheet array react hydrothermally to form an amorphous CoMoS4 nanosheet array; and (3) under hydrothermal conditions, nickel chloride hexahydrate, selenium dioxide and urea react to form amorphous NiSe, and the amorphous NiSe is deposited on the surface of the amorphous CoMoS4 nanosheet array to obtain an amorphous CoMoS4 / NiSe nanosheet array composite material finally. The preparation method is simple and low in cost, and the prepared amorphous CoMoS4 / NiSe nanosheet array composite material has high specific capacitance and good cyclic stability, can be applied to super capacitor electrode materials and has a good application prospect.

This invention relates to synthetic method of a ( E, E) - geranyl linalool. The invention takes (E) - nerolidol as raw material. The hydroxyl is shield by dihydropyrane, gain ( E) - nerolidol tetrahydropyrane aether; selenium dioxide and teri-butyl hydroperoxide selectively oxidize the anti-form methyl of ( E) - nerolidol tetrahydropyrane aether to gain anti-form allyl position hydroxylated oxidative product ( E, E) - 12 - hydroxy nerolidol tetrahydropyrane aether, transit halogenating reaction to gain ( E, E) - 12 - halogeno- nerolidol tetrahydropyrane aether, then take reaction with isopropyl methyl ketone that is selectively divested one proton by diisopropyl amido lithium, generate ( 6E, 10E) - 2, 6, 10, 14 - tetramethyl - 14 - ( tetrahydropyrane - 2 - oxygen) -16 - 6, 10, 15 - triene - 3 - ketone, use sodium borohydride to reduce to gain ( 6E, 10E) - 2, 6, 10, 14 - tetramethyl - 14 - ( tetrahydropyrane - 2 - oxygen) -16 - 6, 10, 15 - triene - 3 - alcohol, takes reaction with sulfonyl chloride or sulphonic acid ester with alkali presence to gain ( 6E, 10E) - 2, 6, 10, 14 - tetramethyl - 14 - ( tetrahydropyrane - 2 oxygen) -16 - 6, 10, 15 - triene - 3 - alcoholic sulphonic acid ester, then divide sulphonic acid ester group under base catalysis to gain ( E, E) - geranyl linalool tetrahydropyrane aether, and by deprotection to gain ( E, E) - geranyl linalool. ˕For the configuration of ( E) - nerolidol 3 position tertiary carbon is not influenced in the course of reaction, if use ( E) - nerolidol that has optical activity as raw material, should gain optical active ( E, E) - geranyl linalool. ((E, E)-geranyl linalool can replace Teprenone and such type medicament intermediate, natural product intermediate, insect pheromone and spice etc.

The invention discloses a remediation method for quinclorac contaminated soil. the remediation method comprises the following preparation steps that (1) mixed powder of coal ash, titanium dioxide, vanadium pentoxide, cuprous oxide, zinc oxide, sodium silicate, selenium oxide, molybdenum oxide, hydroxyapatite, cow dung, beta-cyclodextrin, yeast powder, kieselguhr, sodium succinate, sodium peroxide, sepiolite, ammonium citrate dibasic and chitin is weighed, ground and then discharged, and a remediation agent is obtained; (2) half of the remediation agent is scattered on the contaminated soil, and plowing and ultraviolet irradiation are conducted sequentially; (3) the remaining half of the remediation agent is scattered, plowing and ultraviolet irradiation are conducted sequentially, an ultraviolet lamp is turned off, and ventilation is conducted; and (4) a compound solid inoculant is scattered, and plowing and remediation are conducted sequentially. The remediation method provided by the invention has a significant remediation effect on the quinclorac contaminated soil, the degradation rate of the remediation method is up to 89% or above, the remediation steps are simple, the period is short, the cost is low, and the remediation method can be applied in reality widely and conveniently.

The invention discloses a method for preparing a titanium / selenium multicolour composite conversion film on the surface of an aluminium alloy. The method mainly comprises the following steps: preparing film-forming solution according to a ratio that per cubic litre of the film-forming solution contains 0.1-5g of titanates, 0.1-8g of selenium oxides or selenates, 0.1-10g of organic acids, 0.1-10g of an auxiliary oxidant, 0.1-8g of a film-forming accelerant and the balance deionized water, and carrying out degreasing and activating treatments on pre-grinded aluminium alloy; placing the aluminium alloy in the film-forming solution at 10-60 DEG C and carrying out conversion treatment for 5-30min, then taking out the aluminium alloy and cleaning the aluminium alloy with distilled water, blow-drying the aluminium alloy by natural wind and then obtaining the Ti-Se multicolour composite conversion film on the surface of the aluminium alloy. The method disclosed by the invention is low in cost, simple to operate, capable of improving the corrosion resistance of the aluminium alloy, quite high in environmental value, and easy to produce.

The invention provides a fish feed additive preparation method. The method is characterized in that the method comprises the following steps: dissolving 100 parts by weight of ammonium humate having a water solubility of above 90% in 200-250 parts by weight of water, filtering for residual removal to obtain an ammonium humate solution, sequentially adding 3-15 parts of sodium hydroxide, 3-15 parts of ferric phosphate, 3-15 parts of calcium phosphate, 3-5 parts of selenium oxide and 15-30 parts of N, P and K to the ammonium humate solution to obtain a fish feed additive mixed solution, adding amino acids to the fish feed additive mixed solution according to a ratio of 100-500g / L, and uniformly mixing to obtain a fish feed additive. The invention also provides the fish feed additive prepared through the method. The additive can maintain the healthy and rapid growth of fish, effectively inhibit the viability of water surface algae and other fish pathogens and maintain good culture water quality, and is a green fish culturing product.

The invention relates to the regeneration of an electrolysis bath for the production of I-III-VI<SB>Y< / SB> compounds in thin layers, where y is approaching 2 and VI is an element including selenium, whereby selenium is regenerated in the form Se(IV) and / or with addition of oxygenated water to reoxidise the selenium in the bath to give the form Se(IV).

The invention provides a method for extracting selenium from a material containing arsenic, selenium and aluminum. The method comprises the following steps of: leaching selenium from the material containing arsenic, selenium and aluminum by using a Na2S solution; dropping 10% of H2O2 into a leaching liquor so as to precipitate the selenium; and washing precipitate to remove impurities so as to obtain coarse selenium with content of 98-99%. The method for extracting selenium from the material containing arsenic, selenium and aluminum, provided by the invention, has the advantages of simple method, low energy consumption, good operation environment, purity of the extracted coarse selenium of not less than 98%, total yield of the selenium of more than 98% and no secondary pollution caused tothe environment; the arsenic content in the product is not more than 0.1% and can be used for preparing selenium dioxide, selenium fertilizer or selenium contained drugs or can be purified again to obtain high-purity selenium; and the resources are comprehensively utilized.