One Of The High Level Materials Nickel Crucible

The dissolution method of a rare earth magnesium alloy sample comprises the following method: weighing a rare earth magnesium alloy sample and placing it in a container, adding dilute nitric acid, placing the container on an electric furnace plate for heating, and then cooling to room temperature; The cooled sample is filtered, and the filtrate is collected into a container for later use as the main solution; The filtered residue and the filter paper are placed in a platinum crucible and slowly heated and evaporated, then the filter paper is ashed, the mixed flux is added after cooling, melted at high temperature, and then leached with acid, and finally the solution is merged into the main solution as the solution to be measured for the detection of various elements. According to the characteristics of rare earth magnesium alloy samples, suitable acids are used to dissolve the acid solubles in the samples, and the residues are melted by high-temperature alkali melting. It solves the potential safety hazard of using hydrofluoric acid in the sample dissolution process, and also avoids the problem of nickel crucible waste.

1.A preparation method for nitrogen-rich graded porous carbon materials with high specific surface area, using silkworm cocoons as natural nitrogen-rich carbon precursors, placing silkworm cocoons in sodium carbonate solution, boiling and refluxing to remove sericin, then washing with water to remove residual sericin and sodium carbonate, then drying, then pre-carbonization under inert shielding gas, and finally grinding to obtain carbon fibers after cooling; After grinding and mixing carbon fiber and potassium hydroxide and gCN, they are placed in a nickel crucible, and the nickel crucible is placed in a tube furnace, and the temperature is raised to 300~400 °C for 30min under inert shielding gas, and then the temperature is continued to rise to 700~800 °C and then kept warm for 1~2.5h to obtain carbonization products; The carbonization product is cooled and grinded, and then washed with hydrochloric acid and deionized water until neutral, and then the filter cake is dried, that is, the nitrogen-rich graded porous carbon material is obtained. The prepared products have good electrochemically active ion transfer, excellent capacitance rate performance and capacitor energy storage capacity.

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