金的挥发性极差,在熔点温度之上至1300℃几乎无挥发性,但在煤气和CO气氛中挥发性大大增加。因此,在碳覆盖层下熔炼金会因挥发而造成金的损失。 金的延展性极好。1g纯金可拉成3500m长、直径0.00434mm的细丝,或压成厚度为0.23×10-8mm的金箔。
The volatility of gold is very poor, and it is almost no volatile at 1300 degrees Celsius above the melting point, but the volatility is greatly increased in the gas and CO atmosphere. As a result, the melting of gold under the carbon covered layer will result in the loss of gold. Excellent extension of gold. 1g gold can be drawn into 3500m long, 0.00434mm diameter filaments, or pressed into a thickness of 0.23 * 10 8mm gold.
|