535results about How to "Fully oxidized" patented technology

The invention discloses a preparation method of a graphene material. The preparation method comprises the following steps of: with graphite carbon as a raw material, adding potassium hypermanganate and concentrated sulfuric acid in batches in different stages to control an oxidation process of graphite; adjusting the pH value of the oxidized solution to obtain graphene oxide colloidal dispersing solutions (GOS) with different concentrations; dropwise adding the GOS on the surface of a carrier or spreading out the GOS on a non-intersolubility liquid/liquid interface and drawing into a grapheneoxide thin-film (GOF); carrying out high-speed centrifugation and drying treatment on the GOS to obtain graphene oxide solid powder (GOP); reducing the GOS by selecting an appropriate reducing agent,and centrifugally drying to obtain reduced graphene solid powder (GRP); dispersing a proper amount of GRP in an organic solvent to prepare a reduced graphene oxide colloidal dispersing solution (GRS); and dropwise adding the GRS on the surface of the carrier or spreading out on the non-intersolubility liquid/liquid interface and drawing into the reduced graphene thin-film (GRF). Various graphene materials prepared by the invention are easy to mutually transform; and the concentration of the colloidal solution and the thickness of the thin-film can be controlled in a certain range.

A positive electrode active material for a non-aqueous electrolyte secondary battery is provided. The positive electrode active material includes a composite oxide containing lithium and metal M other than lithium, and M contains Ni, Mn, and Co. The molar ratio of Ni to the total of Ni, Mn, and Co is from 0.45 to 0.65, and the molar ratio of Mn to the total of Ni, Mn, and Co is from 0.15 to 0.35. The positive electrode active material has a pressed density under a compression of 60 MPa of 3.3 g/cm³ or more and 4.3 g/cm³ or less. The positive electrode active material has a volume resistivity under a compression of 60 MPa of 100 Ω·cm or more and less than 1000 Ω·cm.

The invention relates to a process for preparing 4,4'-dichlorodiphenylsulfone, in particular to a process for preparing 4,4'-dichlorodiphenylsulfone employing a sulfoxide oxidation method. The process comprises the following steps: carrying out friedel-crafts reaction with chlorobenzene and thionyl chloride under the action of a catalyst to obtain the 4,4'-dichlorodiphenylsulfone; dissolving the obtained 4,4'-dichlorodiphenylsulfone with a solvent; adding hydrogen peroxide and carrying out oxidation reaction to obtain a 4,4'-dichlorodiphenylsulfone crude product; carrying out secondary oxidation refining on the obtained 4,4'-dichlorodiphenylsulfone crude product; and finally preparing high-purity 4,4'-dichlorodiphenylsulfone. The purity of the 4,4'-dichlorodiphenylsulfone purified by the refining process is greater than 99.5%; the refining yield is greater than 98.5%; and the process completely meets the synthesis requirements of high-performance polymers.

The invention relates to a high-performance silver cadmium oxide material and a manufacturing method thereof, which are characterized in that the silver cadmium oxide material comprises the following components: 85 to 97 percent of silver, 2 to 15 percent of cadmium, 0.01 to 0.5 percent of nickel, 0.01 to 1 percent of tin and 0.01 to 0.5 percent of rear earth mixture. The manufacturing method of the high-performance silver cadmium oxide material is characterized in that: a given quantity of silver, cadmium, nickel, tin and rare earth mixture are measured to be arranged inside a middle-frequency induction furnace to be smelted and cast, the cast ingot is extruded by an extruding machine to be thick wires, the thick wires are stretched by a wire-drawing die to be thin wires, the thin wires are pre-oxidized by an internal oxidization furnace, then the thin wires are cut and preformed and finally is processed and formed. The anti-oxidization performance, electric-arc burning loss resistance and the abrasion resistance of the silver cadmium oxide material are improved, and the service life is prolonged, so the high-performance silver cadmium oxide material can be applied to different working environments, has low production cost, simple manufacturing method and low requirements on the device and the production.

The invention provides a comprehensive method for processing laterite nickel ore to produce electrolytic nickel through the full wet process. The invention relates to a method for leaching low-grade laterite nickel ore at atmospheric pressure through sulfuric acid, belonging to the technical field of wet-process metallurgy. The comprehensive method comprises the following steps of: grinding the laterite nickel ore, leaching the laterite nickel ore by using sulfuric acid with acidity of 150-350 g/L under the acid-ore mass ratio of 0.3-1.2:1 at atmospheric pressure, adding a neutralizing agent to adjust the pH value to 3.0 and neutralize the precipitate to remove iron, adding the neutralizing agent into the mother liquid to adjust the pH value to 6.0 and neutralize and remove aluminum and silicon, continuing adding the neutralizing agent into the filtered nickel sulfate solution to adjust the pH value to 9.0 and precipitate nickel hydroxide, redissolving, purifying and electrolyzing the intermediate product of nickel hydroxide to produce the electrolytic nickel product, adding calcium hydroxide into the nickel-precipitated magnesium sulfate solution to neutralize the precipitate, and carbonizing and separating magnesium and calcium to obtain magnesium carbonate. The invention overcomes the defects of long flow, great magniferous sewage amount and difficult treatment in the prior art, magnesium is developed into a product, the production sewage can be directly discharged or recycled, and meanwhile, part of recovered magnesium can be circularly returned to the flow as the neutralizing agent.

The invention provides a method for extracting tellurium from tellurium copper slags. The method includes the following steps of (1) sulfating calcination at a high temperature, grinding the tellurium copper slags, mixing ground tellurium copper slags with a concentrated sulfuric acid to calcine, enabling the mass ratio between the concentrated sulfuric acid and the tellurium copper slags to be (1.2-1.5):1, maintaining the calcination temperature in a range from 450 DEG C to 600 DEG C and maintaining the calcination time in a range from 3 hours to 5 hours; (2) alkaline leaching to separate the tellurium, leaching obtained calcination slags by a sodium hydroxide alkaline liquor, and then filtering to obtain a tellurium containing alkali leaching liquid and alkali leaching slags; (3) oxidizing the alkali leaching liquid, oxidizing the tellurium containing alkali leaching liquid by sodium hypochlorite of an oxidant and then filtering to obtain sodium tellurate filtered slags; and (4) acid dissolution reduction, dissolving the sodium tellurate filtered slags by a chloridion containing acidic system, adding a reducing agent to achieve reduction and then filtering to obtain tellurium powders. According to the method for extracting the tellurium from the tellurium copper slags, a complete separation of copper, selenium and tellurium can be fully achieved, a comprehensive recovery of the copper, selenium and tellurium can be achieved, the technological process is simple, tellurium dioxide of an intermediate product is not required, the tellurium powders with a high purity can be directly produced, and the tellurium powders can serve as raw materials of 6N high purity tellurium.

The invention provides a method for extracting rhenium from rhenium-rich concentrates. The method comprises the following steps of: mixing the rhenium-rich concentrates with quick lime, grinding a mixture, feeding oxygen-enriched air into the mixture, and roasting the mixture at a temperature of 400-900 DEG C; sizing and immersing the roasted mixture by using water, and filtering after the immersion is finished; adding an impurity removing agent into the filtered liquid so as to remove calcium and trace heavy metal ions; filtering after removing impurities; and carrying out ion exchange process on the filtered liquid, which is subjected to impurity removal and filtering, through anion exchange resin, obtaining ammonium rhenate solution after desorption, and obtaining ammonium perrhenate through reconcentration and crystallization. According to the method provided by the invention, quick lime oxygen-enriched roasting and water immersion are used, so that the operations of decoppering, arsenic removal and desulfuration are carried out, therefore rhenium, arsenic and sulfur are oxidized sufficiently under the oxygen enrichment condition; the rhenium, arsenic and sulfur are combined with calcium oxide, so that insoluble substances are generated; the effects of removing copper, arsenic and sulfur are more thorough in the water immersion condition, and the disadvantage that the calcium content is high in the quick lime roasting and water immersion technology is solved through using the impurity removing agent to remove impurities; and the recovery rate of rhenium is high, so that the method provided by the invention is favorable to industrialized application.

The invention relates to a treatment method of coarse tin decoppered slag, which comprises the following steps: jetting industrial oxygen with the purity of 93-98.5% to the surface or inside of the coarse tin decoppered slag at the temperature of 850-1250 DEG C until the coarse tin decoppered slag is completely oxidized into copper oxide and tin tetroxide dust; leaching the copper oxide and tin tetroxide dust for 2-3 hours under atmospheric pressure and temperature under the condition of the initial acid of 70-120 g/L to obtain leached filtered slag, and carrying out reduction smelting to produce coarse tin; concentrating the leached filtrate to crystallize, and separating to produce chalcanthite product, or carrying out electrolysis to produce electrolytic copper; and returning the crystallization mother solution or electrolysis solution to the leaching process for solution preparation. The invention can separate tin and copper in the crude tin decoppered slag in a safe and efficient way, and does not generate waste water, waste gas or waste residue.

The present invention relates to eggshell Ru porcelain and a production process thereof. According to the eggshell Ru porcelain, 5%-10% of kaolin, 35%-45% of Banpo clay, 11%-23% of Tanggou clay, 20%-25% of black soil, 6%-7% of feldspar and 6%-8% of quartz are used as green body materials. The contents of Al2O3 and SiO2 in the raw material are relatively high, and strength and thermal stability of porcelain can be effectively improved, so that the porcelain is firm and durable and lays a good foundation for eggshell. In the production process, a molded body is subjected to refining and polishing, so the refined porcelain is delicate and smooth, and light and exquisite. An ethanol solution with a content of 5%-15% is used for wiping green bodies, and the purpose is to make the green body surfaces to contain a small amount of combustible and volatile organic compounds, so that the porcelain can be sufficiently oxidized during firing, water and organic matter in the body are promoted to be discharged, the green bodies shrink normally, and the strength of the eggshell Ru porcelain is improved.

The present invention relates to the technology of cleaning the inner wall of boiler with chemical solution. The chemical solution consists of potassium nitrate, copper nitrate, magnesium nitrate, aluminum nitrate and boric acid; and it may be jetted via the observation hole to the flame area of operating boiler or sprayed to the surface of formed coke of idle boiler.

The present invention discloses inflated metallurgical floatation process and apparatus, and features the completely covered microbubble inflating in the self balanced water separated microbubble generating and inflating mode. The apparatus includes a main machine, a bubble overflowing system, a microbubble generating separator, a microbubble generating system, an automatic mineral slurry regulating mechanism to control the liquid level, etc. Inside the floatation column, leaching tank and oxidation tank, great amount of microbubbles are generated in the bottom and flown in the opposite direction to the falling mineral slurry so as to raise the stirring effect, form stable floating bubble layer, speed oxygen dissolution, increase oxygen utilizing rate, enhance oxidizing leaching and raise floatation recovering rate.

The invention relates to a preparation method of triglycidyl isocyanurate (I). The preparation method of triglycidyl isocyanurate is characterized by comprising the following steps: stirring triallyl isocyanurate in the presence of alcohol, acid carbonate and nitrile; adding 30% of hydrogen peroxide and stirring the mixture at 25-60 DEG C to keep the reaction for 6-10 hours, and then completing the reaction; performing aftertreatment on the reaction liquid to obtain the triglycidyl isocyanurate. The yield is more than 80.0%.

A method for improving ceramic sintering performance by adding a small amount of polylactic acid in an artificial bone prepared by laser belongs to the field of bone tissue engineering. When a selective laser sintering (SLS) technology is used for preparing a porous biphasic calcium phosphate ceramic (BCP) artificial bone, a sintering part has the disadvantages of low density and insufficient mechanical properties, and the invention aiming at the disadvantages provides the method for improving BCP sintering performance by adding 0.1-1% by mass percentage of poly-L-lactic acid (PLLA). The advantages of the method are that: a transient liquid phase introduced by use of low temperature fusion of the PLLA can promote the rearrangement and densification of BCP particles so as to improve BCP sintering performance; the PLLA can be fully oxidized until complete disappearance under reasonable process parameters, PLLA residual in the artificial bone can be avoided, and finally the high-performance porous artificial bone completely made from BCP is prepared. The invention relates to the method for improving calcium phosphate bioceramic laser sintering performance by adding a small amount of a polymer material, and the method has the characteristics of simple operation process, good product performance and wide application range.

The invention discloses a preparation method of an aqueous single-layer graphene solution. According to the method, natural graphite, calcium nitrate, potassium nitrate, concentrated sulfuric acid and potassium permanganate are mixed and processed to obtain a graphite oxide solution, and after the graphite oxide solution is prepared into an aqueous single-layer graphene oxide solution, a reducing agent is added for a reaction, and the aqueous single-layer graphene solution is obtained. According to the method, the aqueous single-layer graphene solution with high single layer rate, strong compositing feature and uniform dispersion is prepared finally after multiple times of ultrasonic stripping.

The invention provides a memory device and a manufacturing method thereof. Forming a sacrificial layer in a first sub-channel hole in a first stacked layer; then forming an etch stopping layer; and then continuing to form a second stacked layer over the etch stopping layer; forming a second sub-channel hole above the first sub-channel hole using the etch stopping layer as an etching focus when thesecond sub-channel hole is formed in the second stacked layer; so that a through channel hole is formed after the etch stopping layer above a second sacrificial layer and the second sacrificial layerare removed. Therefore, the integration of the memory device is effectively improved; meanwhile, the over etching to the second sacrificial layer is avoided during etching of the second sub-channel hole by setting the etch stopping layer; therefore, the process stability is improved, and the device yield is increased.

The invention discloses a preparation method of expandable graphite, comprising the following steps of: A. adding 35-40wt% of hydrogen peroxide with 10-14% of graphite by taking crystalline flake graphite as the raw material, cooling and stirring for 3-5min or enabling the hydrogen peroxide to be uniformly attached on the surface of a material; B. adding 98wt% of sulfuric acid which is 2-2.5timesof the weight of the graphite into the mixture, cooling, stirring, and reacting for 10-16min; C. adding mixed acids which is 13-20% of the weight of the graphite into the mixture, and reacting for 160-180min; D. washing the material to the pH value not less than 5, dehydrating and drying to obtain the expandable graphite. By using the method provided by the invention, the expansion ratio of a final product can be stabilized, and the cost can be reduced.

The invention relates to a preparation method of epoxidized styrene-isoprene-cinnamene block copolymer. In organic solvent, polyethylene glycol is taken as phase transfer catalyst, the styrene-isoprene-cinnamene block copolymer is epoxidized through organic peroxy acid generated by organic acid and hydrogen peroxide in situ, to ensure that double bonds on a polyisoprene chain segment are transformed into epoxy radical, and then sodium hydroxide solution is added to neutralize the system, simultaneously, antioxidant is added to prevent the epoxidized styrene-isoprene-cinnamene block copolymer from being oxidized, and after azeotropy, the organic solvent is removed through vaporization to obtain the epoxidized styrene-isoprene-cinnamene block copolymer. The used solvent can be circularly utilized. The epoxidized styrene-isoprene-cinnamene block copolymer prepared with the method is provided with certain polarity and cohesive strength, the adhesion property to the polar material is strong, the oil resistance is good, and the epoxidized styrene-isoprene-cinnamene block copolymer can be used as thermoplastic elastomer to prepare hot melt pressure-sensitive and adhesive sealant, etc.

The invention provides a laser marking method for increasing salt spray corrosion resistance of two-dimension codes on a surface of an aluminum alloy. A DM code bottom layer is formed by directly marking with laser on an aluminum plate substrate; a square pattern is made on wax paper by using a thermo-sensitive method; the square pattern is larger than specification of existing DM codes on the surface of an aluminum plate; electrochemical etching is carried out in a DM code area of the aluminum plate by using an electrochemical etching method with the wax paper as a template to form a layer of oxidation film having protection function, so that a DM code mark with salt spray corrosion resistance is formed. Compared with the DM code mark directly marked on the surface of the aluminum alloy with laser, salt spray corrosion resistance of the DM code mark generated by the method can be increased greatly, and the oxidation film in a marking area is controllable; the influence of the mark for part matrix out of the marking area is poor; the operation is simple; and the efficiency is higher.