96 results about "Minor metals" patented technology

The invention relates to an ICP-MS measuring method of trace metal impurities in high purity lead, which adopts a high-purity nitric acid dissolving sample and uses the electrolytic method to remove lead in the high purity nitric acid dissolving sample, and utilizes inductive coupled plasma mass spectrometer and adopts peak jumping mode to scan and test blank, work-curve standard solution and sample elements to be detected so as to obtain the content of the elements to be detected. The ICP-MS measuring method of trace metal impurities in high purity lead is convenient in operation and can effectively eliminate matrix effect caused by excessively high total solid content and avoid pollution during the preparation process of samples, thus greatly reducing memory effect and obviously increasing measuring accuracy. The ICP-MS measuring method of trace metal impurities in high-purity lead is applicable to the analysis and testing of the content of a plurality of trace metal impurities.

The invention provides convertible organic bonding dry film lubricant and a method for preparing the same, belonging to the lubrication technical field. The lubricant consists of macromolecular resins, solid lubricant, metallic conversion agent, talcum powder and dispersant. The method for preparing the convertible organic bonding dry film lubricant is as follows: firstly, the macromolecular resins are dissolved into a part of the dispersant to obtain macromolecular resin dispersion liquid; secondly, the solid lubricant, the talcum powder and the metallic conversion agent are dispersed into the other part of the dispersant and fully grinded to obtain the other dispersion liquid; thirdly, after the macromolecular resins are fully dissolved, the two parts of dispersion liquid are mixed and stirred at a high temperature, and the convertible organic bonding dry film lubricant is prepared. The lubricant provided by the invention can form a lubricating solid dry film on rustless or rusty metallic surface through synchronous implementation of conversion of metals and trace metal oxides and spray coating of the lubricant, and has the advantages of good bonding force with the metals, rust protection, lubrication, long service life, quick drying, convenient use and low cost; and the paint film can endure the high temperature of 200 DEG C and is particularly suitable for repair and maintenance of parts and components.

The invention relates to an ICP-AES detection method for trace element content in a lead concentrate. The trace elements comprise copper, zinc, cadmium, tin, antimony, iron, aluminum, manganese, titanium, nickel, chromium and cobalt elements. The objective of the invention is to solve the problems that the detection of multiple metal elements in the lead concentrate is not accurate, specially themeasurement for the content of the trace metal elements is not accurate. The method comprises the steps of: preparing a sample solution; preparing a working curve standard solution of copper, zinc, cadmium, tin, antimony, iron, aluminum, manganese, titanium, nickel, chromium and cobalt, measuring the mass concentrations of the sample solution and a blank test solution; and calculating the contentof the copper, zinc, cadmium, tin, antimony, iron, aluminum, manganese, titanium, nickel, chromium and cobalt elements according to formulas. The measurement result is accurate, the detection range islarge, the content of multiple trace elements is accurately measured, and the ICP-AES detection method can be widely applied to official testing institutions or third-party detection.

The invention relates to a preparation method of electronic grade tetraethoxysilane and particularly relates to a preparation method of electronic grade tetraethoxysilane for chemical vapor deposition in semiconductor industry. The preparation method comprises the steps of firstly complexing most of metal impurities in raw materials by using a complexing agent, and then filtering by using a microporous filter of 0.1 micron; passing through a cation exchange tower, a quartz plate type distillation tower and a sub-boiling distiller, strictly controlling temperature, and removing trace metal impurities, ethanol, other organic impurities and water. The preparation method provided by the invention adopts conventional purification equipment and has the advantages of convenience in operation, effect of being conductive to industrial large-scale production and low product cost.

The invention discloses a catalytic conversion agent of tar in gas for a biomass boiler, which consists of the following ingredients by weight percent: 0.1% to 0.3% of Na2CO3, 0.1% to 0.3% of K2CO3, 0.1% to 1% of Fe3O4, 0.5% to 0.8% of NaCl, 0.5% to 0.8% of KCl, 0.3% to 0.5% of KOH, 0.3% to 0.5% of NaOH, 0.1 to 1% of Ni(NO3)2 6H2O, 0.1 to 1% of KNO3, 0.1 to 0.5% of Ce(NO3)3 6H2O, 20% to 46% of dry attapulgite powder and 46% to 75% of dry dolomite powder, wherein the dry dolomite powder is the dry powder with the grain size not less than 325 meshes, the water content less than 1% and the CaCO3/MgCO3 ratio ranging from 1 to 1.5, and the dry attapulgite powder has the grain size not less than 325 meshes, the water content is less than 1%, the content of MgO is not less than 23% and the content of SiO2 is not more than 56%. By using the catalyst, tar in biomass gasified gas can be converted into combustible small molecules, so as to reduce the hazard caused by tar remarkably.

The invention relates to a method used for raising the output of marsh gas by using anaerobic fermentation of organic effluent water, which pertains to the technical field of biological treatment of effluent water. The invention adopts simulated organic effluent water or practical wastewater from chemical industry as treatment objects, by adding trace metal element Co and metal ion chelating agent to an anaerobic reactor to improve the biological availability of trace metal elements which are essential for methanogen and promote the growth and activity of methanogen, thereby, methane output and transformation efficiency of contaminating material of the system is improved. The method needs only extreme micro-amount of trace metal element Co and metal ion chelating agent, therefore, the invention is not only convenient to be manipulated with high efficiency and but also low in cost which leads the invention to be extensively applicable in engineering practice.

Provided are a gold-silver-palladium alloy single-crystal bonding wire and a manufacturing method thereof. The main material of the gold-silver-palladium alloy single-crystal bonding wire is high-purity silver, and the gold-silver-palladium alloy single-crystal bonding wire further comprises gold, palladium, europium, lanthanum and other trace metal materials. The gold-silver-palladium alloy single-crystal bonding wire comprises, by weight, 98.713%-99.157% of the silver, 0.8%-1.2% of the gold, 0.04%-0.08% of the palladium, 0.002%-0.004% of the europium and 0.001%-0.003% of the lanthanum. The manufacturing method comprises the steps that the high-purity silver with the purity higher than 99.9999% is extracted and manufactured into silver alloy ingots, as-cast gold-silver-palladium alloy single-crystal main wires are manufactured, the single-crystal main wires are manufactured into single-crystal wires of around 1mm through a drawing mode, heat treatment is carried out on the single-crystal wires, and then gold-silver-palladium alloy single-crystal bonding wires of different specifications are manufactured through precise drawing, heat treatment and cleaning.

The invention provides a gold-plating gold and silver palladium alloy single-crystal bonding filament and a manufacturing method thereof. The bonding filament is mainly made of high-purity silver and comprises metal, palladium, europium, lanthanum and other trace metal materials. The bonding filament comprises, by weight, 97.713%-98.157% of silver, 1.8%-2.2% of gold, 0.04%-0.08% of palladium, 0.002%-0.004% of europium and 0.001%-0.003% of lanthanum. The manufacturing method of the gold-plating gold and silver palladium alloy single-crystal bonding filament comprises the steps that high-purity silver with the purity larger than 99.9999% is extracted, a silver alloy ingot is manufactured, a cast-condition gold and silver palladium alloy single-crystal bus is manufactured, the single-crystal bus is pulled to be a single-crystal filament which is about 1mm long, after thermal processing, a pure-gold protection layer is electroplated on the surface of the single-crystal filament, and gold-plating gold and silver palladium alloy single-crystal bonding filament of different specifications are manufactured after precise pulling, thermal processing and washing.

The invention relates to a method for preparing high-temperature resistant silicon carbide. The method is technically characterized by comprising the following steps of: uniformly mixing liquid polycarbosilane and organic metal salt, crosslinking and curing, performing ball-milling, cracking at the temperature of between 900 and 1,100 DEG C, and performing high-heat treatment at the temperature of between 1,600 and 1,850 DEG C to obtain the crystalline silicon carbide containing a trace amount of metal elements. A SiO2 protection membrane which is obtained by performing high-temperature oxidation on the synthesized silicon carbide is SiO2 solid solution containing a trace amount of metal elements. The trace amount of metal elements reduces the activity of SiO2, and increases the conversion temperature of active and passive oxidation of the silicon carbide, so that the use temperature of the silicon carbide is increased. Compared with the prior art, the method has the advantages that: by introducing a trace amount of metal elements into the silicon carbide, the use temperature of the silicon carbide is increased from 1,700 to 1,800-1,850 DEG C, and equipment used by the preparationprocess is simple, safe and reliable, is easy to control and contributes to large-scale production.

The invention discloses a treatment method for separating and extracting nickel, cobalt, magnesium and iron from laterite nickel ores. The treatment method comprises the following steps: grinding thelaterite nickel ores and heating the laterite nickel ores with microwaves; adding sulfuric acid to prepare a laterite nickel ore leaching liquid; introducing oxygen, pressurizing and heating the laterite nickel ore leaching liquid, and adjusting the pH to 2-3 for separating iron secondarily; adding P204 into the leaching liquid to extract other trace metals to obtain an aqueous solution only containing nickel, cobalt and magnesium; adjusting the PH for separating magnesium secondarily; adding P507 and dimethyl tetradecylamine into the leaching liquid to extract cobalt; electrically depositingnickel in form of nickel sulfate to produce electric nickel; and reversely extracting cobalt with a high concentration sulfuric acid solution and electrically depositing the solution to produce electrolytic cobalt, wherein in the process of electrically depositing nickel and cobalt, oxygen will be separated out and sulfuric acid is regenerate, and oxygen and sulfuric acid are recovered for recycling. According to the treatment method, metals which are relatively great in content in the laterite nickel ores can be extracted, the dosage of oxygen and sulfuric acid in the cyclic process can be reduced, heavy metal pollution by the waste liquor to the environment is reduced while the metals are fully recovered, and the treatment method is energy-saving and environment-friendly.

The invention relates to a preparation technology of superfine steel slag micropowder and a production process thereof. Metal iron included in steel slag is separated and recycled for many times in circulation by selecting a column mill, a V-shaped powder separator and a magnetic separator as a pre-grinding closed cycle system; and trace metal iron included in superfine steel slag micropowder is separated and recycled for many times by selecting a high-fine mill, a K-type powder separator, a settling chamber and the magnetic separator to form a final-grinding closed cycle system. Accordingly, the prepared superfine steel slag micropowder has the specific surface area of larger than or equal to 600m<2>/kg, wherein the superfine steel slag micropowder with grain diameter smaller than 30 mu m accounts for more than 90 percent of the total mass and has the metal iron content of not more than 0.5 percent.

The invention discloses an aluminum alloy anode material, and a casting method and an application thereof. The aluminum alloy anode material is prepared through casting Pb, Sn, Ga, Ti and Al. The casting method concretely comprises the following steps: 1, refining alloy: (1) placing pure aluminum blocks in a shaft furnace in batches, and heating for melting the pure aluminum blocks; (2) adding trace metal elements into the high temperature shaft furnace after all the aluminum blocks are completely molten; (3) stirring all above components by a graphite rod after all the components are completely molten; and (4) adding hexachloroethane, and removing the waste residues in the molten aluminum; and 2, carrying out casting molding: (1) coating the internal surface of a die with a layer of a release agent, and carrying out heating and heat insulation; and (2) pouring the molten aluminum alloy into the die, and casting the aluminum alloy to form aluminum ingots. The aluminum alloy anode material has low overpotential and high hydrogen evolution overpotential, so an electrode made of the material has high electrochemical activity and high anode utilization efficiency during the running of a battery.

The invention discloses a refined method of Chinese wax, comprising 1) acid cleaning to removal impurity, which means acidic solution is adopted to removal the phospholipids and micro metal ion in the liquated raw wax; 2) adsorbing to decolor, which means the floridin and the silicon dioxide are adopted to decolor and removal the protein in the liquated raw Chinese wax under vacuum state. The refined method of Chinese wax has the advantages of simple technique and convention operation. The appearance of the made Chinese wax and the physicochemical index can reach the first wax standard set by < trading cooperative standards of P.R.C- Chinese wax [GH011-80] >, and also has the advantages of increasing the productive rate and the purity of the Chinese wax and lowering the productivity energy consumption.

The invention provides a copper alloy single-crystal bonding wire for microelectronic packaging and a preparation method thereof. The bonding wire adopts high-purity copper as a main body material, and comprises micro-scale metal materials of silver, scandium, iron, titanium and the like. The bonding wire is composed by the following materials in weight percentage: 99. 9%-99. 95% of copper, 0.01-0.02% of silver, 0.01-0.02% of scandium, 0.001-0.015% of iron and 0.001-0.01% of titanium. The preparation method comprises the following steps: extracting the high-purity copper, the purity of which is larger than 99.99%; preparing a copper alloy ingot; preparing a cast copper alloy single crystal bus; drawing the single crystal bus into a single crystal wire, the diameter of which is about 1 mm, and then, carrying out heat treatment; and then, carrying out precision drawing, heat treatment and cleaning to prepare copper alloy single crystal bonding wires in different specifications.

The invention provides a manufacture method of a composite gold wire, comprising the steps of providing a main metal raw material containing a silver componnet; putting the main metal raw material in a vacuum melting furnace and carrying out mixing melting after adding a minor metal material containing a palladium component in the vacuum melting furnace and mixing to prepare a silver-palladium alloy melting liquid; then continuously casting and pulling and stretching the silver-palladium alloy melting liquid into a silver-palladium alloy wire rod; and at last, stretching the silver-palladium alloy wire rod into a silver-palladium alloy bonding wire with the preset wire diameter. The invention also provides the composite gold wire comprising the following ingredients in percentage by weight: 90.00-99.99 percent of silver and 0.01-10.00 percent of palladium. By dint of the silver-palladium alloy bonding wire prepared by mixing the two metal raw materials such as silver and palladium, the invention can not only achieve the effect of metal wire rods made of pure gold but also greatly reduce the cost.

A preparation method of sludge ceramsite capable of slowly releasing trace metal elements including copper and nickel is implemented as follows: sludge, coal ash and clay of a sewage plant are dried respectively and sieved with a 200-mesh sieve, 3-5 g of sludge, 6-8 g of coal ash and 8-10 g of clay are weighed and stirred uniformly, an appropriate amount of water is slowly added to the mixture and sufficiently stirred, the mixture is put in a press machine and subjected to extrusion forming, raw ceramsite with the diameter of 4-6 mm is obtained, dried at the temperature of 100 DEG C, preheated for 20 min and calcined at the temperature of 1,050 DEG C for 16 min, and the sludge ceramsite is prepared; the ceramsite is put into a mixed solution containing CuCl2 and NiCl2 to be soaked, then taken out and dried for standby application; a cladding material is prepared by mixing epoxy resin, acidamide resin, an ethanol solution and starch, soaked and well dried ceramsite is added and stirred, accordingly, the surface of the ceramsite is uniformly coated with the mixture and put in a drying oven to be dried, and the sludge ceramsite capable of slowly releasing the trace metal elements including copper and nickel is prepared. The ceramsite is applicable to anaerobic biological treatment of organic wastewater lack of trace metals Cu2+ and Ni2+, and the COD (chemical oxygen demand) removal rate of the wastewater can be increased by more than 12%.

The invention discloses a metal zipper with a double-side color effect and a production method thereof; a zipper teeth base material comprises 63-67% of copper, 33-37% of zinc, other trace metals, and colored layers with two different colors on surfaces and different-thickness organic protective layers coated according to different zipper types. The production method comprises the steps: chain teeth after chemical polishing are colored with a first color; then one face of each tooth is coated with a chemical protective layer with the thickness of 0.02-0.25 mm; and next the other face of each tooth has the color faded by a chemical deplating solution to expose a metal material and then is colored with a second color, and finally the other face is coated with the organic protective layer with the thickness of 0.02-0.25 mm.

The invention discloses a doping lithium iron (II) phosphate material and a preparation method and an application thereof, belonging to the field of lithium ion battery. The chemical formula of the material is LiFe1-xMxPO4/Cy, wherein, M represents doped element, namely one or more of Y, Al, Cr, Co and Ni, x is 0.003-0.005 and y is 1.22-3.06. Carbon and phosphorus elements of the material are fromthe same raw material so as to ensure the real molecular mixing of carbon and lithium iron (II) phosphate in the prepared material; in addition, trace doped metal can improve the conductivity of thelithium iron (II) phosphate. No conductive agent is needed to add in the material provided by the invention which has larger gram-capacity, and the invention is simple and practical and has large promotional value in the new material field of lithium ion secondary battery.

The present invention relates to a Silicate-1 microsphere molecular sieve catalyst containing a trace amount of metal ions, and a preparation method thereof, and a method for preparing caprolactam from cyclohexanone oxime. According to the present invention, based on the weight of the dry base of the catalyst, the catalyst comprises 70-95 wt% of a Silicate-1 molecular sieve catalyst containing a trace amount of metal ions, and 5-30 wt% of a binder; the catalyst has a particle size of 40-150 [mu]m and a wear index K of less than 5; the Silicate-1 molecular sieve has a BET specific surface areaof 400-500 m<2>/g and a weight ratio of silicon oxide to metal ions of (5000-200000):1; and the catalyst has the low wear index, can be used for the vapor phase Beckmann rearrangement reaction of cyclohexanone oxime in a fluidized bed process, and can effectively increase the selectivity of caprolactam.

The invention provides a microcrystal prepared from waste cinder. The microcrystal is characterized in that: the microcrystal is prepared from the following raw materials by mass: 30 to 50 g of waste cinder, 10 to 28g of quartz, 12 to 25g of limestone, 6 to 15g of calcined soda, 1.3 to 3.0g of borax, 0.2 to 0.3g of zinc oxide, and 0.8 to 1.2g of sodium nitrate. The microcrystal has the advantages of high mechanical strength, high hardness, excellent wear-resisting property, acid-alkali resistance, and good chemical stability and thermal stability, and can be used in any severe environment, and also keeps the higher mechanical strength in high temperature environment; the microcrystal also has the advantages of no pore space, close texture, water resistance, no toxins, no dielectric and zero dielectric, no radioactivity, and safe use, and is a reasonable environmental protection building material; moreover, the microcrystal can be carved and is suitable for hot bending deformation, so that the microcrystal can be widely applied, and can be used for decoration on a cylinder, a plane, a curtain wall, kitchen ware, a high-grade document, furniture, a sauna bathroom and the like, and the production cost is reduced by more than 25 to 35 percent. Because the waste cinder contains various trace metal elements, various bright colors are prepared. Because a large amount of waste cinder is consumed, the key problem of environmental protection is solved.

The invention provides a manufacture method of a composite gold wire, comprising the steps of providing main metal raw materials containing components of gold and silver; putting the main metal raw materials in a vacuum melting furnace and carrying out mixing melting by adding minor metal materials containing a palladium component in the vacuum melting furnace to prepare a gold-silver-palladium alloy melting liquid; then continuously casting and pulling and stretching the gold-silver-palladium alloy melting liquid into a gold-silver-palladium alloy wire rod; and at last, stretching the gold-silver-palladium alloy wire rod into a gold-silver-palladium alloy bonding wire with the preset wire diameter. The invention also provides the composite gold wire comprising the following ingredients in percentage by weight: 8.00-30.00 percent of gold, 66.00-90.00 percent of silver and 0.01-6.00 percent of palladium. By dint of the gold-silver-palladium alloy bonding wire prepared by mixing the three metal raw materials such as gold, silver and palladium, the invention can not only achieve the effect of metal wire rods made of pure gold but also greatly reduce the cost.

The invention discloses a preparation method of a high-corrosion-resistance sintered neodymium-iron-boron magnet, and the methodcomprises the following steps: preparing a neodymium-iron-boron alloy cast sheet containing trace metal, and standing in dry air for 10-30 days to enable a neodymium-rich phase to fully absorb oxygen; performing hydrogen decrepitation, performingcooling to 35 DEG C afterdehydrogenation is finished; stoppingcooling, and standing for 30 to 120 minutes; introducing 20 to 100 ppm of pure oxygen into a hydrogen decrepitation reaction device;when the oxygen content is reduced to 10 ppm or below, performingcooling again, taking out the coarse powder, performing mixing, adding a lubricating agent and an antioxidant, not supplementing oxygen during jet milling, preparingfine powder, performing cold storage treatment on the fine powder, performing orientation forming, increasing the temperature to be less than or equal to 2 DEG C in the forming process, performing 180-300MPa cold isostatic pressing, and finally sintering, aging and tempering to obtain the high-corrosion-resistance neodymium-iron-boron magnet. According to the method, on the premise that the magnetic performance of the magnet is not reduced, the stability and corrosion resistance of the neodymium-rich phase of the sintered neodymium-iron-boron magnet are improved.

The invention provides an acidity nanometer cobalt catalyst, the main active constituent of which is Co and the accessory constituents of which are Zn, Mn and trace metals; the existence form of all constituents of the catalyst is as follows: (Co, Zn)O, (CoZn2)O4, Co3O4, ZnO, MnO, K2O, Na2O, and Li2O; the catalyst is carrier free acidity nanometer cobalt catalyst which is acidized, the average grain diameter of which is 3-18nm, the specific surface is 75-400m/g, and the average pore size is 4-20nm. The preparation process of the catalyst adopts a supercritical fluid drying technique, which causes the prepared catalyst is characterized by small grain diameter, big specific surface, small pore size and high activity. The catalyst is mainly used for synthesis gas CO+H2 which is directly transformed to prepare high isomerization clean fuel, and used for Fischer-Tropsch reaction of the synthesis gas preparing liquid hydrocarbon; wherein the conversion rate of CO reaches more than 78% and the isomerization product accounts for more than 53% of the total liquid hydrocarbon product.

The invention discloses a method for detecting trace elements in silicate materials, which is simple and is strong in operability. The detection method comprises the steps of: (1) preparing a sample to be detected; (2) determining EDTA influence factors; and (3) determining the contents of metal elements such as iron, magnesium, calcium or aluminium. The detection method provided by the invention comprises the step of detecting an iron element, a magnesium element, calcium element and an aluminium element. The detection method disclosed by the invention has the advantages that fast and simple detection for trace metal elements such as iron, magnesium, calcium and aluminium in primary coal ash, blast-furnace slag, volcanic ash and the like, less detection devices are used and the cost is low.