A kind of crucible suitable for preparation of materials with hierarchical pore structure

Abstract

The invention provides a crucible suitable for preparation of materials with hierarchical porous structures. The crucible comprises a crucible body composed of the sidewall and the bottom; the bottom is provided with a first spiral groove; inner layer plates and upper layer plates are arranged in the crucible body via a supporting mechanism; the upper layer plates are arranged at an upper opening of the crucible body; the inner layer plates are provided with second spiral grooves and first air holes, and the first air holes are not communicated with the second spiral grooves; the upper layer plates are provided with second air holes; the air holes on the inner layer plates and the upper layer plates are arranged in a staggered manner, so that normal flowing of gas is ensured in heating process, and spattering of samples out from the crucible is not easily caused. According to the crucible, spattered samples falls after collision with the upper layer plates; gas flow is generated because of vaporization of liquid in the grooves, so that samples will fall back to the outside of the grooves of the inner layer plates, and influences on product morphology caused by falling back of samples into solution, joining of samples with solution, and repeated vaporization are avoided.

Description

technical field [0001] The invention relates to a crucible, in particular to a crucible for preparing a uranium adsorbent with a multi-level pore structure. Background technique [0002] In recent decades, porous structure materials have attracted the interest of many researchers. Its special structure can increase the specific surface area, and the size of the specific surface area is a key factor affecting the application of uranium adsorption. Therefore, the synthesis of adsorption materials with a porous structure, It has become a hot spot that scholars pay more and more attention to nowadays. Hierarchical pore structure MgO represents a new type of uranium adsorbent, with its high volume reduction rate, low solubility, greater cost-effectiveness, low specific gravity, safer and more reliable, high surface activity, and high environmental friendliness. favored by many scientists. [0003] The applicant has carried out research on the preparation method of MgO with hier...

AI Technical Summary

Problems solved by technology

[0005] 1. Due to the volatilization of solvent and water vapor during the heating process, the crucible lid cannot be covered to form a closed system, and the generated multi-level porous structure MgO has a large specific surface area and a small specific gravity. Fly out due to volatilization of water vapor, resulting in sample loss

[0006] 2. The magnesium nitrate solution in the crucible should not be too much, because the solvent and water vaporization process will have an important impact on the pore structure. If too much solution is added, it is difficult to control the gas generation rate, and the solvent interacts during the gasification process. The shape of the generated sample is not easy to control

Therefore, in the actual preparation process, although the volume of the crucible is large, only a small amount of solution can be added to form a 0.5 cm solution layer at the bottom of the crucible to obtain better results, and the amount of prepared samples is less

[0007] 3. The bottom of the existing crucible is in contact with the bottom of the muffle furnace, while the wall of the crucible is in contact with the air in the muffle furnace. The samples are heated in different ways and are unevenly heated

[0008] 4. The flying sample falls back into the solution, then merges with the solution, and is repeatedly gasified, which affects the appearance of the product

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