钨渣中有价金属综合回收工艺

来源期刊：中南大学学报(自然科学版)2003年第1期

论文作者：戴艳阳 钟海云 李荐 钟晖

文章页码：36 - 39

关键词：回收； 钽； 铌； 钨渣； 工艺

Key words：recovery； tantalum； niobium； tungsten residue； technique

摘    要：对从钨渣中回收钽、铌的工艺进行了研究;采用苏打焙烧水浸与酸浸结合的湿法处理,经实验确定了最佳工艺条件:苏打用量为理论量的6.0倍,焙烧温度为850～950℃,焙烧时间为50 min.水浸液固比为6:1,时间为90 min;酸煮时HCl浓度为20%,浸出液固比为6:1,时间为60min.按照以上条件处理钨渣,可获得含Ta₂O₅+Nb₂O₅达15.89%(其中w(Ta₂O₅)为4.06%)的钽铌富集渣,钽铌回收率达79.46%.该工艺既可完善我国现行的钨冶金流程,充分利用自然资源,获得可直接应用的钽铌生产原料.又可减少大量钨渣堆存引起的环境污染问题.

Abstract: Technique of valuable metals’ recovery from tungsten residue by hydrometallurgical process composed by soda roasting, poaching and acid leaching is studied in this paper. The optimal technical conditions are ensured by experiments as follows; dosage of soda is six times of the theoretical dosage, roasting temperature is about 800℃ to 900℃ , roasting time is 50 min, ratio of fluid and solid in water leaching is 6 and leaching time is about 90 min, concentration of hydrochloric acid in acid leaching is 20%, fluid/solid ratio in acid leaching is 6 and leaching time is about 60 min. Treat the tungsten residue according to conditions mentioned above, enriched residue which contains Ta₂O₅5+Nb₂O₅ up to 15. 89%(content of Ta₂O₅ is 4. 06%) is obtained and recovery of metals can reach 79. 46%. It can not only improve the existingtungsten metallurgical flow, utilize natural resource fully, get producers’ goods of tantalum andniobium but also can decrease the circumstance pollution caused by large numbers of tungsten residues.