11 results about "Minor metals" patented technology

The utility model discloses a powder coating trace metal impurity removing and sorting device which comprises a filtering cylinder, a first filtering plate and a second filtering plate, cylinder covers are installed at the two ends of the filtering cylinder, a discharging opening is formed in the lower half portion of the filtering cylinder, the first filtering plate is arranged in the discharging opening, a groove body is installed in the center of each cylinder cover, and a plurality of grooves are formed in the groove body. A collecting shell is arranged in the groove body and the shaft hole, an annular groove is formed in the inner side face of the cylinder cover, a ring body is movably arranged in the annular groove, the two ends of the second filter plate are installed on the ring body, and a driving mechanism for driving the ring body to rotate is installed on the cylinder cover. The powder coating filtering device is simple in structure, filtering can be rapidly conducted through combination of the first filtering plate and the second filtering plate, along with rising of the second filtering plate, powder coating can be filtered, metal impurities are intercepted, after the second filtering net rotates to a certain angle, the metal impurities can automatically slide into the collecting shell along the inclined second filtering plate, and the powder coating filtering device is convenient to use. And impurities can be conveniently collected.

The invention relates to the technical field of functional ceramic products, in particular to original degerming and moisturizing functional ceramic and a preparation method and a use method thereof.The functional ceramic is formed by firing natural mineral argil, and the natural mineral argil is naturally enriched with at least two trace metal elements of iron, copper, zinc and manganese needed by human metabolism; the porosity of the body of the functional ceramic is 15-30%, and the functional ceramic is used in cooperation with food to be heated in a microwave oven heating scene. According to the invention, natural mineral argil is taken as a raw material, and through structural design and process optimization, triple functions of moisturizing, nutrition supplement and sterilization in a microwave oven heating scene are realized, so that the core pain point of food moisture loss is solved, trace elements required by a human body are safely supplemented, and meanwhile, the safety of food after heating can be improved; the product is stable in preparation process and convenient to use, and has high practical value and market prospect.

The invention discloses a pretreatment method for trace metal impurity detection of a high-purity electronic-grade silicon-based precursor material. The method comprises the following steps: heating and volatilizing a liquid sample in an ultrapure PTFE / PFA beaker, and redissolving by using an electronic-grade inorganic acid-organic acid composite acid system; uniform heating is achieved through a special heating plate, pretreatment volatile organic waste gas is treated in cooperation with a hundred-grade dust-free environment, a clean operation table and a tail gas condensation and collection system, meanwhile, metal impurity concentration of different degrees can be achieved through the proportion of the use amount of a pretreatment sample to the use amount of redissolved inorganic acid, the detection limit is effectively reduced to 1-5 ppt, and the detection efficiency is improved. The recovery rate of the metal impurity detection pretreatment method reaches 85%-115%. The method breaks through the defects of long pretreatment time, silicon and carbon residues, metal loss caused by severe pretreatment reaction and the like of a traditional hydrolysis and digestion method, the treatment time is shortened to 2-4 hours, the G4 / G5 level (single metal 1t, 10ppt) detection requirement is effectively met, and a high-sensitivity and low-background-interference detection scheme is provided for impurity management and control of a high-purity silicon-based precursor in an advanced process.

The application discloses a method for high-selectivity recovery of beryllium from lithium smelting beryllium-containing clinker, and belongs to the technical field of beryllium-containing solid waste resource utilization. After the lithium smelting beryllium-containing clinker is crushed, slurry is prepared, and under the shearing action, concentrated acid is slowly added dropwise to the slurry to precisely control the pH of the slurry in the range of 3.0-3.5 to perform reaction. After the reaction is completed, solid-liquid separation is performed to obtain beryllium-containing filtrate. The beryllium-containing filtrate is subjected to precipitation by using a sodium hydroxide solution to precisely control the end-point pH of the beryllium-containing filtrate in the range of 8.5-9.0, and a composite precipitate containing beryllium hydroxide and potassium sodium cryolite is obtained. The method completely breaks the traditional situation of 'waste production waste', not only realizes efficient separation of the highly toxic beryllium, but also directly converts the beryllium-containing solid waste into 'rich beryllium potassium sodium cryolite composite concentrate' with a main phase of crystalline potassium sodium cryolite and a beryllium grade of more than 5.5%, realizing double high-value extraction of trace metals (beryllium) and bulk minerals (cryolite).

The present application provides a kind of detection method of ash in asphalt.The detection method includes: step S1: raw materials including asphalt and dispersant are heated and mixed in sequence to obtain melt;Step S2: melt is crystallized to obtain asphaltene crystal;Crystallization treatment includes temperature drop and isothermal crystallization treatment in sequence;The temperature drop rate of temperature drop is ≤5℃ / min;Step S3: asphaltene crystal is phase separated to obtain crystalline phase;Step S4: crystalline phase is ashed to obtain ash;The temperature of ashing treatment is ≤200℃;Step S5: ash is detected to obtain the composition and mass content of ash.The detection method of the present application can realize efficient enrichment of ash and very low background interference, can detect most of the trace metal elements in ash, and has good accuracy and repeatability, thereby better meeting the quantitative detection needs of high-quality asphalt for very low ash content.

The invention relates to the technical field of metal content determination, in particular to a method and equipment for determining the content of trace metal in micro-powder lithium carbonate, and the method comprises the following steps: screening out a characteristic wavelength from all specific wavelengths of each to-be-determined trace metal element based on wavelength difference and spectral intensity difference between different specific wavelengths; analyzing the wavelength difference and the spectral intensity difference between each non-specific wavelength and all other non-specific wavelengths, counting the frequency of the spectral intensity corresponding to each non-specific wavelength in the spectrum, and determining the baseline interference degree to screen the baseline interference wavelength; and correcting the spectral intensity based on the spectral intensity and the baseline interference degree of all the baseline interference wavelengths so as to measure the content of each trace metal element to be measured in the micro-powder lithium carbonate. According to the method, by screening the characteristic wavelength and adaptively deducting the background noise, the accuracy and reliability of measuring the content of the trace metal in the micro-powder lithium carbonate are improved.

The application relates to a preparation method of high-purity chromium powder for a target material, comprising the following steps: (1) performing electron beam melting treatment on pretreated electrolytic chromium sheet to obtain a chromium ingot; removing both ends of the chromium ingot to obtain a high-purity chromium ingot; the electron beam melting treatment comprises gradient temperature rising treatment, refining treatment and directional solidification treatment; (2) performing ball milling treatment and screening treatment on the high-purity chromium ingot to obtain the high-purity chromium powder. Through the electron beam melting technology and a multi-section electron beam power control strategy, the application realizes accurate regulation and control of the temperature of a molten pool and refining kinetics. The preparation method can not only efficiently remove conventional metal impurities with a vapor pressure significantly higher than that of chromium, but also promote the diffusion and selective removal of trace metal impurities with a vapor pressure similar to that of chromium, so that the limit of the original purification method is broken through.

This invention relates to a composite calcium oxide slag based on furnace lining adsorption and its application, belonging to the field of protective slag technology. The composite calcium oxide slag of this invention comprises the following raw materials in parts by weight: CaO 48-52 parts, Al2O3 35-40 parts, MgO 5-8 parts, and metallic aluminum powder 1-3 parts. The raw materials are pre-melted and mixed to obtain the composite calcium oxide slag. Before pre-melting and mixing, alumina and metallic aluminum powder are ball-milled, and the aluminum powder is embedded in the alumina matrix in the form of nanocrystals, improving the stability of the composite calcium oxide slag. By utilizing the trace amounts of metallic aluminum pre-embedded in the slag, a rough structure is generated in situ on the surface of the magnesium-aluminum spinel furnace lining, thereby enhancing the mechanical anchoring and chemical adsorption of the dynamic reaction film, reducing the film formation temperature, and greatly increasing the film coverage.

A process for producing high purity alumina (HPA) or high purity aluminium salts from an aluminium-bearing material, such as is disclosed. An aluminium-bearing solution is first obtained by either dissolving or leaching the aluminium-bearing material. Aluminium is then selectively extracted by liquid-liquid or liquid-solid extraction to obtain an aluminium-enriched liquid or aluminium-enriched solid phase. Minor metal impurities still remaining in the aluminium-enriched liquid or solid phase are removed by scrubbing the aluminium-enriched liquid or aluminium-loaded ion exchange resin with an aqueous solution thereby producing a metal impurity-depleted aluminium-enriched liquid or metal impurity-depleted aluminium enriched solid phase. Aluminium is then stripped from the scrubbed liquid or solid phases with an acidic aqueous solution to produce an aluminium-enriched aqueous solution. High purity aluminium salts may be crystallised from said solution. Alternatively, the pH of said solution may be raised to precipitate an aluminium precipitate, such as Al(OH)3, which is then calcined to produce HPA.