直接电脱氧法制备金属锆

Preparation of zirconium by direct electrodeoxidation

在800℃下的CaCl2-NaCl混合熔盐中,以烧结后的ZrO2片体作阴极,高纯石墨碳棒作阳极,在工作电压3.1 V时,采用直接电脱氧法制备金属锆。研究不同烧结温度和压实压力对阴极片体的微观形貌及其对电脱氧反应过程的影响,并利用XRD谱分析电脱氧产物的相组成。结果表明:采用直接电脱氧法可以制备金属锆;16 MPa、1 000℃时制备的阴极片电脱氧反应的平均稳定电流最大;产物中既含有锆的低价氧化物ZrO2?x,也含有锆钙氧化物CaZrO3。

Direct electrodeoxidation was used to prepare metal zirconium in a CaCl2-NaCl melt at 800 ℃ and 3.1 V, using sintered ZrO2 pellets as cathode, and high pure graphite rods as anode. The effects of the sintering temperature and pressure on the micro-morphology of the ZrO2 cathode were investigated. The composition of production of above-mentioned samples was analyzed by XRD. The results show that the metal zirconium can be prepared by this method, and that the electrodeoxidation current of ZrO2 cathode is the biggest under the pressure of 16 MPa and sintering temperature of 1 000 ℃, and also ZrO2-x and CaZrO3 exist in the product.