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废贵稀金属

发布:czllz 浏览:1682次

  贵稀金属是贵金属和稀有金属的总称.由于金和银由人民银行专营,物资部门经营的贵金属主要是铂族元素.而硒碲砷属稀散元素,通常称为半金属.

  铂:铂是银白色金属,熔点为1769度,密度为21.45g/cm3,主要用于电气仪表化学工业及制作精密合金等用.

  钯:钯是银灰色金属,熔点1552度,密度12.16g/cm3,可塑性好,在贵金属中耐蚀性较差,供电气仪表化工工业及制作精密合金等用.

  铑:铑是烟灰色金属,熔点为1960度,密度为12.44g/cm3,是脆性金属.供电气仪表高温合金及精密合金等用.

  铱:铱是银灰色金属,熔点为2443度,是贵金属中熔点最高的.密度为22.4g/cm3,是脆性金属,化学性质稳定,耐酸碱腐蚀,硬度高,用于电气,化学,仪表,轻工等方面,配制精密合金.

  镓:液态镓为银白色金属,固态镓为蓝色结晶金属,质地柔软,熔点为29.8度,密度是5.9g/cm3.在空气中化学性能稳定.镓主要用于半导体工业,制作温度计,配制易熔金属等.

  铟:铟是银白色金属,熔点156.6度,密度为7.31g/cm3,比铅还软,延展性好,化学性能稳定,主要用于配制贵金属合金,低熔点合金,轴承合金以及电子电镀等工业方面.

  硒:硒是黑色或深灰色玻璃状无定型锭块(红硒与灰硒为硒的结晶变体,主成分不变),属于稀散元素,也称半金属.硒的熔点为220度,沸点为685度,密度为40808g/cm3,质脆,主要用于制造整流器,硒感光板,复印硒鼓,合金,搪瓷和玻璃工业等方面.

  碲:碲是一种银灰色半金属,属稀散元素,熔点为450度,密度为6.24g/cm3,质脆,具有很高的电阻系数,是逆磁性金属,所以是良好的半导体材料,主要用来制作半导体器件,合金,化工原料及铸铁,橡胶,玻璃等产品的添加剂.

  砷:砷是银灰色半金属,属稀散元素.砷的熔点为814度,在613度时即升华,砷在空气中易氧化,砷的氧化物有剧毒(俗称砒霜).砷的密度为5.73g/cm3,不溶于水,也不溶于有机溶剂.用于制作合金和半导体器件等.


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