日本住友化学公司1982年底建一座用特种吸附剂回收镓的工厂,其生产能力每年10吨。该公司开发了这种吸附剂,并有一套从铝矾土中回收化学半导体的专门技能。铝矾土中含大约100ppm的镓,所回收的粗镓纯度可达99.9-99.999%,可精制到99.999%的纯度,这种高纯镓可卖到每克46美分的高价,住友公司说,该工厂是世界上第一座从铝矾土中回收镓的厂。一般说来,镓是由镀 At the end of 1982, Japan’s Sumitomo Chemical Co., Ltd. built a plant for the recovery of niobium with special adsorbents. Its production capacity is 10 tons per year. The company developed this sorbent and has a set of expertise to recover chemical semiconductors from bauxite. Bauxite contains approximately 100 ppm of yttrium, and the purity of the recovered crude yttrium can reach 99.9-99.999%, and can be refined to a purity of 99.999%. This high-purity yttrium can be sold at a high price of 46 cents per gram, Sumitomo said. The plant is the first in the world to recover thorium from bauxite. In general, helium is plated