148results about How to "Low content of impurity elements" patented technology

The invention discloses a Cu-Fe in-situ composite with boron, silver and rare earth elements added and a preparation method thereof. The invention is characterized by adopting multimode comprehensive strengthening technology such as multi-micro alloying, solid solution strengthening, aging strengthening, fine grain strengthening, distortion strengthening, fiber strengthening and the like, using Cu as the base and adding a little Fe and trace Ag and B, rare earth or rare earth compounds to prepare the high strength and high conductivity copper alloy material through smelting, casting, hot forging or hot rolling, solid solution treatment, cold rolling or cold drawing, aging and the like. The prepared material has the advantages of high strength, good electric and thermal conductivity, simple preparation process and low cost, thus realizing wide application in the fields such as electronics, information, transportation, energy, metallurgy, electromechanics and the like.

The invention discloses a total-converting steelmaking method of an electric furnace. The method achieves the purposes of energy saving and consumption reducing through the working procedures containing adjustment for ratio of raw materials and strict control for the converting process. The method specifically comprises the following steps of: controlling the proportion of molten iron to be 71-79 percent; adding steel scraps through a furnace mouth for one time, and adding the molten iron through an iron exchanging mouth for two times; preheating, warming and decarburizing the steel scraps and molten steel in a furnace through a nozzle of an oxygen-burning system 3 installed on a furnace wall; during converting, regulating a corresponding gear according to demands, meanwhile converting with a furnace door oxygen gun, and making the converting efficiency to be maximized; adding slag making materials such as lime into the electric furnace to make slag; and when the molten steel achieves the temperature and components needed by steel grades, carrying out ladle deoxidization for steel tapping. Compared with the general steelmaking method of the electric furnace, the total-converting steelmaking method of the electric furnace has the advantages that electrode heating is cancelled, the consumptions of the electric energy, electrode and steel scrap are greatly reduced, the smelting cost per ton of steel is greatly reduced, the pollution is decreased, meanwhile the contents of harmful elements in the steel are reduced, and the product quality is increased.

The invention provides a method for removing deep impurities of coarse tellurium powders, relating to a method for removing deep impurities in the coarse tellurium powders which are recovered from copper anode slimes. The invention is characterized in that in the process of impurity removal, coarse tellurium powders react with nitric acids, which makes the tellurium in the coarse tellurium powders oxidized into the tellurium dioxide and makes impurity elements in the coarse tellurium powders form nitrates to be dissolved into the solution, and after filtering and separation, impurity nitrates are removed; after being washed, filter slimes are dissolved by sodium hydroxide, and solid impurities are obtained by filtering and separation; and the filtrate is added with sulphuric acids for neutralization, and tellurium dioxide powders are obtained after filtering. The method of the invention adopts the nitric acid oxidation impurity removal process, thereby major impurity elements in the coarse tellurium powders can be removed; moreover, the purity of tellurium dioxide powders obtained by the method is more than 99.9 percent.

The invention relates to a rare earth containing, high-strength and high-toughness seamless steel pipe for the L555Q pipeline and a production method thereof. The seamless steel pipe is composed of 90 wt% of blast furnace molten iron and 10 wt% of high-quality waste steel in percentage by weight. The pipe blank comprises the following chemical components in percentage by weight: 0.06 to 0.13 wt% of C, 0.15 to 0.35 wt% of Si, 1.10 to 1.40 wt% of Mn, not more than 0.020 wt% of P, not more than 0.010 wt% of S, 0.10 to 0.30 wt% of Cr, 0.03 to 0.09 wt% of V, 0.01 to 0.03 wt% of Ti, 0.01 to 0.04 wt% of Al, 0.0005 to 0.0100 wt% of rare earth (RE), not more than 0.10 wt% of Cu, and the balance being substrate Fe and undetectable trace impurity elements. The mechanical properties of the seamless steel pipe are as follows: the yield strength is 600 to 680 MPa, the residual stress is smaller than or equal to 30 MPa, the impact value is more than or equal to 160 J/cm<2>, and the grain size is more than or equal to 8.5 grade. The technology process can be simplified as the following steps: molten iron pre-treating, smelting in a top-bottom combined blowing converter, refining in a LE furnace, VD vacuum processing, round continuous casting, cutting, heating the pipe blank, perforating, continuous rolling, sizing (stretch reducing), cooling, sawing, heat treating, straightening, flaw detecting, and chamfering. The product has the advantages of low impurity element content, high roughness matching degree, uniform and fine tissue, and good welding performance.

The invention discloses a production method of Aluminum-Silicon alloy in the field of metallurgy technology by utilizing a composite waste including aluminum ash and coal gangue, which has the procedures as follows: the first step is the material preparation and the pretreatment of raw material, i.e. iron removal by magnetic separation pretreatment for aluminum ash, optimal selection and milling to the granularity of smaller than 40 meshes and iron removal by magnetic separation pretreatment on coal gangue; the second step is proportioning and briquetting, i.e. proportioning according to the following weight percent including 5 to 25 percent of aluminum ash, 60 to 95 percent of coal gangue and 0 to 15 percent of petroleum coke, adding 15 to 20 percent by the weight of raw material of waste pulp with as binder, mixing the material to briquette and baking to moisture of below 2 percent; the third step is preparation of Aluminum-Silicon alloy by using electrothermal method. The invention overcomes the component limitation of one solid waste, not only decreases the cost of Aluminum-Silicon alloy and but also consumes the wastes which easily cause the environmental pollution.

The invention relates to a method for preparing industrial pure zirconium ingot, used in the field of nuclear power, metallurgy, petrochemical engineering and the like. The method includes the steps that industrial sponge zirconium of required weight is weighed to prepare an electrode block by pressing; the pressed electrode block is welded into an electrode; and then electric beam melting on vacuum consumable electro-arc furnace combining electric beam melting is carried out for at least once, so as to obtain industrial pure zirconium ingot. The zirconium ingot produced by the invention has uniform and stable chemical components and low content of impurity elements of Fe, Cr, O, H and the like, is better than the ingot melted by vacuum consumable electric arc, and is not mixed with high or low density of ZrO2 and WC; and the invention is applicable to producing pure zirconium ingot with high metallurgy quality.

The invention discloses a Cu-Cr in-situ composite with boron, silver and rare earth elements added and a preparation method thereof. The invention is characterized by adopting multimode comprehensive strengthening technology such as multi-micro alloying, solid solution strengthening, aging strengthening, fine grain strengthening, distortion strengthening, fiber strengthening and the like, using Cu as the base and adding a little Cr and trace Ag and B, rare earth or rare earth compounds to prepare the high performance copper alloy in-situ composite through smelting, casting, hot forging or hot rolling, solid solution treatment, cold rolling or cold drawing, aging and the like. The prepared material has the advantages of high strength, good electric and thermal conductivity, simple preparation process and low cost, thus realizing industrial application in the aspects such as electrician switches, contact materials, resistance electrodes, rotor conductors of large electrical high speed turbine generators, overhead conductors of electric cars and electric trains, lead frames of very large scale integrated circuits and the like.

A process for preparing Nb and/or Ta powder features that under the action of reducer chosen from alkali metal plus at least one of the halides of Mg, Ca, Sr, Ba, Li and Ce, the alkali-metal fluonidobium and/or tantalate is reduced at 300-1050 deg.C to obtain said products. Its advantages are high recovery rate for reduction, and large specific surface area, high porosity and low oxygen content of product.

The invention provides a high-recovery-rate method for recovering noble metal platinum with low impurity element content and high purity, which comprises the following steps: 1) putting a noble metal platinum sample into a container, firing and cooling; 2) preparing a dissolution agent by using 36-38 wt% hydrochloric acid and 66-68 wt% nitric acid in a volume ratio of (1-4):1 a dissolution reagent; 3) adding the prepared dissolution reagent into the cooled container, and heating until the metal platinum is completely dissolved; 4) evaporating the solution by heating to the nearly dry state, adding hydrochloric acid, and evaporating the solution by heating to the nearly dry state; 5) dropwisely adding an ammonium chloride solution into the container, and filtering to obtain an ammonium chloroplatinate precipitate; and 6) putting the ammonium chloroplatinate precipitate into the container, firing and cooling. The metal platinum recovered from the noble metal platinum sample has the advantages of low impurity element content and high purity; and the method provided by the invention enhances the recovery rate of platinum, has the advantages of simple technical process, low cost and high recovery value, and is beneficial to energy saving, emission reduction and environmental protection.

The invention provides a rare earth yttrium doped molybdenum disulfide self-lubricating composite coating and a preparation method thereof. Specifically, the molybdenum disulfide self-lubricating composite coating is doped with rare earth yttrium, wherein the molar content of yttrium in the composite coating is 0.1%-5% according to the total molar content of the composite coating. According to themolybdenum disulfide self-lubricating composite coating, sublimed sulfur, yttrium chloride hexahydrate and molybdenum trioxide are adopted as raw materials, and the rare earth yttrium doped molybdenum disulfide self-lubricating composite coating is prepared through the chemical vapor deposition method. The molybdenum disulfide self-lubricating composite coating has good wear resistance and self-lubrication and excellent winding plating property. Coating deposition can be conducted on large-size complex workpieces of a complex shape.

The invention discloses a reinforced and toughened metastable beta titanium alloy. The reinforced and toughened metastable beta titanium alloy comprises the following elements in percentage by weight:3.6-6.0% of Al, 3.0-5.0% of Mo, 3.0-5.0% of V, 2.0-5.9% of Cr, 1.0-4.0% of Nb, 0.4-2.0% of Fe, 0.05-0.3% of O, and the balance of Ti and inevitable impurities; the total quantity of impurity elementsis not higher than 0.15%; and the weight percentage sum of all the components is 100%. The invention further discloses a preparation method of the titanium alloy. Through changing of the adding formof Nb element, formation of the high-density inclusion defect of Nb-enriched non-melted blocks is prevented. Step variable-power smelting process parameters are adopted, so that the ingot chemical component uniformity is improved, and the component uniformity and the performance stability of the WSTi544432 metastable beta titanium alloy are guaranteed.

The invention discloses a novel high-strength heat-resistant aluminium-alloy conductor. According to the invention, commercial-purity aluminium is used as a raw material, and traces of boron, antimony, manganese, copper and zirconium elements are added at 800+/-10 DEG C. the novel high-strength heat-resistant aluminium-alloy conductor comprises components of, by weight, 0.01-0.30% of boron, 0.05-0.60% of antimony, 0.02-0.80% of manganese, 0.05-2.30% of copper, 0.05-0.90% of zirconium and the balance pure aluminium and unavoidable impurities. The novel high-strength heat-resistant aluminium-alloy conductor is manufactured by a conventional alloy smelting technology. The prepared aluminium-alloy conductor has high strength, good heat resistance and excellent conductivity. Comprehensive performance of the conductor is raised effectively. The aluminium-alloy conductor can be widely applied in national electric transmission lines, especially a long-span long-distance transmission and transformation project.

The invention relates to an on-the-spot sample quick analysis method for major elements and trace elements in monocrystal high-temperature master alloy. The on-the-spot sample quick analysis method comprises the following steps: firstly, taking monocrystal master alloy melt in a vacuum induction furnace by using a fireproof cup and adopting a secondary immersion method, quickly cooling after solidifying, and completing sampling; secondly, cutting the tail part of a test sample into a first test sample of which the thickness is 8 to 15 mm, cutting a second test sample of which the thickness is3 to 6 mm from the remained test sample, pelletizing, and using the remained part as a third test sample; finally, respectively testing the major elements and the trace elements in the monocrystal master alloy by adopting a carbon-sulfur detector, an oxygen-nitrogen detector, an X-ray fluorescence spectrometer, a direct-reading spectrometer and a glow discharge mass spectrometer, and quickly transmitting detection results to a smelting control room by utilizing an LSAM (Lower Sampling Room) database. According to the on-the-spot sample quick analysis method disclosed by the invention, on-the-spot sample quick analysis on 50 or more major elements and trace elements in the monocrystal master alloy can be completed within 15 to 20 minutes, the on-the-spot sample analysis time of high-temperature alloy is shortened, and accurate data can be provided for effectively controlling the major elements and purified harmful impurity elements for smelting of monocrystal alloy.

The invention relates to a method for accelerating the solidification of casting steel water, wherein it adds micro powder smaller than 20micrometer into steel water while the consumption is 0.05-5% of steel water, while said micro powder can be same material of steel water, or/and electrolyte iron powder. The corn shaper of said invention will not affect the components of steel water.

The invention discloses a high-performance arc spraying Zn-Al powder core wire and a preparation method thereof, belonging to the technical field of metal surface protection. The wire is mainly composed of an outer cladding and a powder core, wherein the outer cladding is a Zn-Al alloy strip; the powder core is mainly composed of the following components in percentage by weight: 60-70% of nano Al2O3 powder, 10-20% of nano TiO2 powder and the balance of nano Y2O3 powder; and the nano powder core accounts for 5-20% of the total weight of the wire. The novel Zn-Al nano powder core wire can be prepared into a Zn-Al nano composite coating through an arc spraying method; and the ocean climate corrosion resistance and the hardness of the coating are far higher than those of the common arc spraying Zn-Al coating.

The invention discloses a high-specific-gravity tungsten-based alloy formation method based on pre-alloyed powder. The high-specific-gravity tungsten-based alloy formation method based on the pre-alloyed powder comprises the steps that firstly, according to the designed ingredients and proportion of the high-specific-gravity tungsten-based alloy, material mixing, pressing, vacuum sintering and forging machining are sequentially conducted, then a tungsten-based alloy rod is obtained, and pre-alloyed powder is obtained through a plasma-rotating electrode powder manufacturing method; secondly, athree-dimensional model of the high-specific-gravity tungsten-based alloy is established, slicing and designing are conducted, and then slice layers and scanning data are obtained; thirdly, with the pre-alloyed powder as the raw material, according to the slice layers and the scanning data, a powder bed type electron beam additive manufacturing forming device is adopted to form the high-specific-gravity tungsten-based alloy. According to the high-specific-gravity tungsten-based alloy formation method based on the pre-alloyed powder, by utilizing the different melting points between tungsten and other elements in the high-specific-gravity tungsten-based alloy, the pre-alloyed powder with tungsten powder particles being wrapped inside low-melting-point element solid solution is prepared, sothat the shells of the pre-alloyed powder are easy to melt and adhere to one another for formation, and therefore the formation difficulty of the pre-alloyed powder is lowered; and with the pre-alloyed powder as the raw material, preparation of the high-specific-gravity tungsten-based alloy is achieved.

The invention provides a preparation method of pentaerythritol tetrabasic acid ester. The method includes the steps of: a) mixing pentaerythritol, fatty acid and a catalyst to perform an esterification reaction to prepare a pentaerythritol tetrabasic acid ester crude product; and b) mixing the pentaerythritol tetrabasic acid ester crude product with a solid adsorbent to purify the crude product to obtain the pentaerythritol tetrabasic acid ester. Compared with the prior art, the preparation method can effectively remove impurities in the reaction system, so that the pentaerythritol tetrabasic acid ester has excellent high temperature performance. A test result proves that the content of impurity elements in the pentaerythritol tetrabasic acid ester prepared through the method is lower than 1 ppm. In addition, the pentaerythritol tetrabasic acid ester has better oxidizing performance, wherein the initial oxidization temperature thereof is increased by more than 10 DEG C in the same base oil.