| 摘要 |
<p>Alkaline bismuthide is concentrated in a debismuthizing dross comprising the alkaline bismuthide and molten lead by a method involving charging the dross onto a heat-resistant screen or sieve of suitable mechanical strength. The screen has openings of such size as to enable the formation and retention thereon of a molten lead-pervious residue cake comprising particles of the alkaline bismuthide, for example of crystals of calcium magnesium bismuthide (Ca Mg2Bi2). The dross is subjected on the screen to the influence of a partial vacuum drawn from the opposite side of the screen from the dross, and the molten lead is sucked or pulled through pore channels of the porous residue cake of the alkaline bismuthide particles which is formed on the screen, and without any significant physical compression of the cake with attendant blockage of the pores of the cake, and then through the screen openings under the influence of the partial vacuum.</p> |
