For everyone, the primary characteristics and cleaning methods of corundum crucible

I'm not sure about the crucible. In fact, the crucible is a key component of chemical instruments. It is a vessel for smelting liquid metal materials, heating and reflecting heterogeneous phase, which is the basic to ensure the smooth development of chemical changes. However, there are many categories of crucibles, including iron crucible, quartzite crucible, high-purity graphite crucible, corundum crucible, etc. in fact, crucibles need to be introduced in detail, and there are many different types.

1、 Characteristics.

A. Crucibles containing more than 95% aluminum are called corundum crucibles.

B. Fused alumina crucible with porous structure is used to produce corundum crucible, which is hard and resistant to melting.

C. Weakly alkaline chemicals such as na2c03 without water are selected as the solution, and it is not suitable to use strong partial alkali and acidic substances such as na202, NaOH as the solution (such as k2s207, etc.).

2、 Index value.

At this stage, some new generation commodities have been developed and designed in China, such as aluminum oxide, corundum crucible, wupengzhang porcelain crucible, etc., and have become a new generation of commodities after clay, cordierite, quartzite and coated crucible. Yiyu crucible uses porcelain crucible to produce wupengzhang porcelain crucible, which has become a new generation of commodities after clay, quartzite and coated crucible. Small coefficient of thermal expansion and high reliability of thermal vibration.

3、 Cleaning method.

A. Acid bubble: it is generally soaked with sodium cyanide and then cleaned with tap water.

B. Dry and impetuous, high temperature temperature control 6-800 ℃.

C. Remove after cooling.

D. Remove the residue and convert the insoluble chemicals into soluble phosphate.

E. Clean a small amount of phosphate in the crucible (decomposition reaction method): be careful not to heat too fast, otherwise the crucible will be mixed with skin.

The characteristics, index values and cleaning methods of corundum crucible are introduced in detail.