| Main Characteristics and Cleaning Method of Corundum Crucible |
| [ Publish: 2018-11-27 ] |
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If I tell you about crucibles, as I don't know how many people know, crucibles are actually an important part of chemical instruments. They are containers for melting and refining metallic liquids and heating and reactions between solid and liquid, and they are the basis for smooth chemical reactions. However, there are many categories of crucibles, including iron crucible, quartz crucible, graphite crucible and corundum crucible. The characteristics, 1. The crucible whose alumina content exceeds 95% or more is called corundum crucible. 2. The corundum crucible is composed of porous fused alumina, which is firm and resistant to melting. 3. Corundum crucible is suitable for melting samples with anhydrous Na2C03 and other weak alkaline substances as flux, but not with Na 202, NaOH and other strong alkaline substances and acidic substances as flux (such as K2S 207, etc.) Second, the indicators Alumina, corundum crucible crucible indicators without expansion ceramic crucible is the present domestic initiative, cordierite, quartz, the clay covering film after the crucible of a new generation of products, yixing jun teng long refractory ceramics production no expansion ceramic crucible, service life and effects can be comparable to the United States imported corning products, with its high life, low consumption and other excellent properties of welcome by users. Crucible 1. Ultra-low expansion coefficient, high thermal vibration stability... Three, cleaning methods 1. Acid bubble: it is usually soaked with nitric acid for a long time; rewash 2, drying, high temperature furnace in 6 hours slow temperature to 800 ℃ 3. After cooling, remove and use. 4. Remove impurities and convert insoluble substances into soluble nitrate for removal. 5, remove the crucible in the trace nitrate (thermal decomposition) : pay attention to the rate of heating must not be fast, otherwise the crucible will skin (burst damage). Above is based on the features of the corundum crucible, index, the respect such as cleaning method for everybody introduction, I don't know what you learned, actually watching these knowledge should be learned a lot about everyone, even people who do not know before is also learned a lot, actually small make up to summarize these wish I can help you a lot of knowledge. |
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