渣浆泵铂族金属 有哪些物理性质?
    铂族金属包括铂、钯、铑、铱、锇、钌6种元素，位于元素周期表中第四副族。它们具有类似的性质，如高熔点、高强度、耐腐蚀、良好的催化活性和电热性。铂、钯、铑、铱为银白色，锇、钌为钢灰色。
    钌、铑在有氧存在和强热下，容易与氧化合为四氧化物，具有挥发性，钌的挥发速度较慢，锇则较快。铂(大于100时)、铱和铑(大于200时)能形成挥发性氧化物。
    铂族金属密度大:轻铂金属密度大于12/m，重铂金属密度大于21g/cm3铂族金屑的沸点都很高。 按元素周期表顺序，从左向右逐渐降低，从上向下连渐提高。其中，钯的沸点最低，锇的沸点最高。
    锇，钌和铑的特点是硬度高并且脆，故能研磨成细粉末，它们都很难机械加工。铂和钯具有延展性。可以辗制利拉丝。纯净的铂具有高度的可塑性，将铂冷轧可以制得厚度为0.025mm的箱。铱仅当升温至红热时才能承受机械加工。

    铂族金属的特殊性质是其表面具有吸附气体(特别是氢气)的性能，呈粉末和胶体状态时其吸附能力大为增强。钯对氢的吸附能力最强，常温下1体积的钯能吸附901体积以上的氢。钯中吸附的氢易全部放出。按照钯、铱、铑、铂、钉、锇的次序，渣浆泵它们吸附氢的性能依次降低。

What are the physical properties of platinum group metals in slurry pumps?

Platinum group metals include platinum, palladium, rhodium, iridium, osmium and ruthenium, which are the fourth group in the periodic table. They have similar properties, such as high melting point, high strength, corrosion resistance, good catalytic activity and electrothermal property. Platinum, palladium, rhodium and iridium are silver white, osmium and ruthenium are steel gray.

In the presence of oxygen and strong heat, ruthenium and rhodium are easily oxidized into tetraoxides, which are volatile. Ruthenium volatilizes slowly, while osmium volatilizes faster. Platinum (greater than 100), iridium and rhodium (greater than 200) can form volatile oxides.

The density of platinum group metals is high: the density of light platinum metals is more than 12 / m, and the density of heavy platinum metals is more than 21g / cm3. According to the order of periodic table of elements, it gradually decreases from left to right, and increases from top to bottom. Among them, palladium has the lowest boiling point and osmium has the highest boiling point.

Osmium, ruthenium and rhodium are characterized by high hardness and brittleness, so they can be ground into fine powder, which are difficult to machine. Platinum and palladium are malleable. It can be rolled and drawn. Pure platinum has a high plasticity, and it can be made into a 0.025mm thick box by cold rolling platinum. Iridium can only withstand machining when heated to red heat.

The special property of PGM is that its surface has the capability of adsorbing gas (especially hydrogen). When it is in the state of powder and colloid, its adsorption capacity is greatly enhanced. Palladium has the strongest adsorption capacity for hydrogen, and 1 volume of palladium can adsorb more than 901 volume of hydrogen at room temperature. The adsorbed hydrogen in palladium is easy to release completely. According to the order of palladium, iridium, rhodium, platinum, nail and osmium, the hydrogen adsorption performance of slurry pump decreased in turn.