6 results about "Minor metals" patented technology

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 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.

The application relates to the technical field of inorganic high-purity powder material preparation, in particular to a continuous preparation process of high-purity magnesium oxide particles, the purity of the magnesium oxide particles is not less than 99.95%, the D50 particle size is 1.8-2.1 mu m, the particle size distribution span is 0.70-0.85, the total content of trace metal impurities is 2.1-4.2 ppm, the thermal weight loss rate is 0.04%-0.08%, and the bulk density is 0.48-0.55 g / cm 3 3 . The application adopts a continuous production mode, replaces a traditional batch process, realizes whole-process continuous operation of raw material feeding, reaction, crystallization, washing, drying, calcination and grading, greatly improves the stability and uniformity of a production process, eliminates batch quality differences, and adapts to industrial large-scale production requirements.​