<報文>塩化法によるカルダサイトからのジルコニウムの分離

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Zircomum is one of the important rare metals for advanced technology. The caldasite, a mixture of zircon and baddeleyite, from Brazil, can be an additional source of zirconium if it is suitably processed. High temperature chlorination of such an ore has many advamages in process development. In this paper, studies have been made to extract zirconium from caldasite through a chloride process. This process consists of chlormation of the ore and the selective condensation of volatile chlorides containing zirconium. The salient features of the chlormation studies are given below. 1) Caldasite ore reacts with Cl_2 gas at about 1000K producing metal chlorides enriched ZrCl_4. 2) 96% of the ore can be chlorinated with a recovery of 95% of zirconium. 3) By selective condensation of the mixture of volatile chlorides consisting of ZrCl_4-FeCl_3-AlCl_3,it has been possible to obtain ZrCl_4 of 97 mole% purity. 4) The same principle has been applied to the chlorinated products of caldasite to obatain zirconium chloride. 5) A process flowsheet for chlorination of caldasite to extract zirconium has been proposed.zirconiumresourceschlorinationrare metalvolatile separation
1991-12-27