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219results about How to "Less impurities" patented technology

Copper chromium zirconium alloy and preparing method thereof

ActiveCN105543540ALess impuritiesReduce composition segregationYttriumZirconium alloy
A copper chromium zirconium alloy comprises, by weight, 0.7% to 2.0% of chromium, 0.05% to 0.3% of zirconium, 0.01% to 0.08% of magnesium, 0.01% to 0.1% of yttrium and the balance copper. The invention further provides a preparing method of the copper chromium zirconium alloy. The preparing method sequentially comprises the following steps that firstly, the copper, the chromium, the zirconium, the magnesium and the yttrium are prepared according to the proportion and are subject to vacuum purified smelting and flow dividing type casting, and a casting blank is prepared; secondly, the casting blank is subject to homogenization treatment and hot extrusion, and a sheared billet is prepared; thirdly, the sheared billet is subject to solid-solution treatment; fourthly, the sheared billet obtained after the solid-solution treatment is subject to cold deformation machining; and fifthly, a material obtained after cold deformation machining is subject to aging treatment, and the needed copper chromium zirconium alloy is obtained. The copper chromium zirconium alloy has the good comprehensive performance, the room temperature tensile strength of the copper chromium zirconium alloy is larger than 520 MPa, the room temperature elongation of the copper chromium zirconium alloy is larger than or equal to 22%, the room temperature electric conductivity of the copper chromium zirconium alloy is larger than or equal to 90%IACS, and the 350 DEG C high-temperature tensile strength of the copper chromium zirconium alloy is larger than 390 MPa.
Owner:SHANTOU HUAXING (RAOPING) COPPER IND CO LTD +1

Method and system for refining cyclohexanone and recycling cyclohexanol

The invention discloses a method and a system for refining cyclohexanone and recycling cyclohexanol. The method is characterized by comprising the following steps: sending an alcohol ketone mixture into a light-component removal tower for removing light components, sending the material discharged from the tower bottom into a cyclohexanone product tower, acquiring a high-purity cyclohexanone product from the tower top and a crude product mainly comprising cyclohexanol from the tower bottom, then sending the crude product into a cyclohexanol recovery tower, and acquiring cyclohexanol from the tower top; mixing the acquired cyclohexanol with proper amount of water, heating and sending into a cyclohexanol dehydrogenation reactor for dehydrogenation, so as to obtain a mixed product containing cyclohexanol, cyclohexanone and water, performing two-stage cooling on the dehydrogenated product, then performing gas-liquid separation, sending the gas phase and the liquid phase into a dewatering tower for dewatering processing, sending oil-containing wastewater removed at the tower top to a cyclohexane extraction tower, sending an obtained upper-layer oil phase to an alcohol-ketone recovery tower, and sending an oil phase containing cyclohexanone and cyclohexanol and obtained at the bottom of alcohol-ketone recovery tower to a dewatering tower for cycling. The invention comprises the advantages that the product cyclohexanone is high in purity, cyclohexnoal is efficiently converted into cyclohexanone at a high yield, and the system is high in energy integration degree and low in energy consumption.
Owner:SEDIN NINGBO ENG

Single or multicomponent organic acid surface finished II-VI group of semiconductor quantum point of sulfhydryl, and method for preparing the same

InactiveCN101508416ALess impuritiesReduce the difficulty of atmosphere protectionIndividual molecule manipulationOrganic acidQuantum yield
The invention relates to sulphydryl single-element or multi-element organic acid surface-modified No.2-No.6 semiconductor quantum dots and a preparation method thereof. The method comprises the following steps of preparation of a precursor solution, preparation of quantum dots, and the like. The sulphydryl single-element or multi-element organic acid surface-modified No.2-No.6 semiconductor quantum dots are the quantum dots formed by CdX (X=S, Se, Te) or ZnX (X=S, Se, Te) which is coated by sulphydryl single-element (or multi-element) organic acid, wherein the mol ratio of the sulphydryl single-element (or multi-element) organic acid to the CdX or the ZnX is between 2:1 and 3:1; and particle diameter of the quantum dots is between 2.0 and 6.0 nanometers. The invention takes gas as a tellurium (or sulfur or selenium) source, and reduces impurity compositions of the precursor solution by introducing H2X (X=S, Se, Te); and due to the superior hydrophilicity of the sulphydryl single-element (or multi-element) organic acid, the prepared No.2-No.6 semiconductor CdX (X=S, Se, Te) and ZnX (X=S, Se, Te) quantum dots,, and the like have good dispersity and wide fluorescent range, and have the quantum yield as high as more than 80 percent. Simultaneously, the quantum dots have small toxicity, good biocompatibility and easy operation, and can be used for medicament tracking, diagnostic marking, and the like.
Owner:SHANGHAI UNIV

Stable magnesia-calcium sand and preparation method thereof

InactiveCN104591759ALess impuritiesSave resourcesDolomiteMagnesite
The invention relates to stable magnesia-calcium sand. The stable magnesia-calcium sand is characterized by being prepared from the following components in percentage by weight: 53-55% of light-burned dolomite, 32.5-35.5% of caustic-calcined magnesite, 11-14% of silica fine powder, 1-1.5% of a stabilizer and 1-1.5% of Fe2O3 which is taken as a sintering agent. The preparation method comprises the following steps: mixing; molding; drying; holding the temperature at 1650-1700 DEG C for 3-6 hours; and sintering. The stable magnesia-calcium sands provided by the invention maintain a good high-temperature performance and CaO exists in form of combined-state beta-2CaO.SiO2 and 3CaO.SiO2 so that the problem that a magnesia-calcium material is easily hydrated is solved. Under the condition of no hydration prevention measures, the requirements for production, long-term storage and application can be satisfied. The product has the following main balanced phase components at a high temperature: periclase, beta-2CaO.SiO2 and 3CaO.SiO2 which are high-melting-point mineral phases, the lowest eutectic point temperature of the three is about 1850 DEG C. A burnt brick is prepared by using the stable magnesia-calcium sands, the refractoriness under load of the burnt brick is greater than 1650 DEG C, and the good high-temperature performance of the magnesia-calcium material is maintained.
Owner:ZHENGZHOU UNIV

Zinc selenide single crystal growing method and zinc selenide single crystal growing container

InactiveCN101665983ALess impuritiesGuaranteed mononuclear growthPolycrystalline material growthSingle crystal growth detailsPhase reactionAmpoule
The invention discloses a zinc selenide single crystal growing method and a zinc selenide single crystal growing container. The method uses zinc and selenium as raw materials and iodine as a vapour phase reaction promoter, and further completes the growth of a zinc selenide single crystal in an ampoule. The method sequentially comprises the following steps: comprehensively cleaning the ampoule, feeding the materials into the ampoule and evacuating the ampoule, sealing the ampoule, cleaning a growing area of the sealed ampoule with hot water, growing crystals, cooling the crystals, and the like. The ampoule has the basic structure that: a raw material area is easy to mix Zn and Se elementary substances; and the growing area consists of a conical body formed by the tangency of two sections of arcs on the cross section of a middle axis of the ampoule. The technical scheme adopted by the invention can grow zinc selenide single crystals of a diameter of 12 to 20mm, and also can be applied to the preparation of other II-VI group compound semiconductor crystals. The grown zinc selenide single crystals have the characteristics of integral structure, good uniformity, small stress, low cost,and simple process.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Production method of low-Cl-oilless cerium carbonate product with large specific gravity

InactiveCN101898786ALess impuritiesLow purityRare earth metal compoundsSpecific gravityChemistry
The invention discloses a production method of a low-Cl-oilless cerium carbonate product with large specific gravity, mother liquor in the production of crystal cerium nitrate is taken as a raw material, and 30% ammonium bicarbonate water solution is taken as a precipitant for synthesizing the low-Cl-oilless carbonate product with the large specific gravity. The production method comprises the steps of using the 30% ammonium bicarbonate water solution to remove oil and iron in raw material solution, then controlling the precipitation time and the precipitation temperature, washing for a plurality of times with deionized water for removing non-rare earth impurities, then carrying out hydration in a centrifuge, and obtaining the low-Cl-oilless carbonate product with the large specific gravity, wherein Cl- in the product is not more than 50ppm, and REO is not less than 65%. The use of the production method can effectively treat the problem of treatment of the cerium nitrate mother liquor in the production of the crystal cerium nitrate, and convert the cerium nitrate mother liquor with higher content of impurities into the low-Cl-oilless cerium carbonate product with the large specific gravity with lower content of the impurities and higher purity by high-temperature precipitation after regulating the PH and removing the oil and the iron by using the ammonium bicarbonate water solution.
Owner:甘肃稀土新材料股份有限公司

Method for reducing wood tar in preparation process of wood vinegar

The invention relates to a method for reducing wood tar in the preparation process of wood vinegar, which belongs to the field of wood vinegar. Aiming at the defects that since a large amount of wood tar is generated in the preparation process of the wood vinegar, and the removing process of the wood tar is complex, the refining of the wood vinegar is disadvantageous, the invention provides the method for reducing the wood tar in the preparation process of the wood vinegar. The method comprises the following steps of crushing wood into particles and then placing the particles in a fermentation tank for fermenting; laying a layer of millets below a high-temperature furnace; stacking the wood particles on the millets; spraying rice bran on an upper layer; collecting at three temperature intervals to obtain crude wood vinegar; performing reduced pressure distillation to remove water and then sealing and standing; adding a NaCl solid in the liquid for hydraulic freezing treatment and filtering; extracting the obtained wood vinegar with diethyl ether and recovering to prepare the refined wood vinegar. According to the method, the wood tar in the wood vinegar in the preparation process can be effectively removed, and the finally-prepared wood vinegar is high in purity and less in impurity; in addition, the method is simple in process and low in cost.
Owner:SHAOXING TEXTILE MACHINERY GRP

Process method for reopening old furnace of cored line-frequency induction electric furnace for producing copper-nickel alloy

The invention discloses a process method for reopening an old furnace of a cored line-frequency induction electric furnace for producing a copper-nickel alloy, comprising the following steps of: adding impurity components obtained by alloying and smelting electrolytic copper for diluting a smelt groove die before stopping the cored line-frequency induction electric furnace for producing the copper-nickel alloy; introducing cooling water before opening the furnace, feeding 240 V of electricity to check a main circuit, a control loop and a cooling water system in a short time; inducting and heating to smelt the smelt groove die by an iron core coil to communicate the smelt groove die by adopting a mode of adjusting the voltage to gradually and stably rise; and heating an upper hearth and the smelt groove die while feeding electricity and baking to smoothly fuse the smelt groove die in a short time. The invention ensures the reuse of the old furnace, prolongs the absolute service life of the cored line-frequency induction electric furnace, saves the fees of the cored line-frequency induction electric furnace for building and casting the furnace and reduces the production cost of each ton of products.
Owner:洛阳双瑞达特铜有限公司
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