中文摘要：

针对目前铋钼混合矿冶炼中存在选矿流程长，需要消耗大量浮选药剂，分离不彻底等严重弊端，提出了铋钼混合矿直接低温熔炼的方法，铋钼矿经直接低温熔炼得到粗铋，钼以钼酸盐的形式进入浸出液，并可通过“水热法”直接制得氧化钼得以回收.在进行了热力学计算分析的基础上，采用单因素试验法考察了熔盐组成、熔盐量、温度、时间和还原剂用量等因素对粗铋品位和铋直收率的影响.获得最优条件为：w（NaCl）/w（NaCl＋Na2CO3）=20%，熔炼温度850℃，w（NaCl＋Na2CO3）/w（混合矿）=2，熔炼时间1 h，w（活性炭）/w（理论量）=2.在此最优条件下，进行2次综合试验，铋的直收率分别为98.12%和96.59%，纯度分别为96.62%和98.87%.

英文摘要：

In view of shortcomings in current bismuth-molybdenum ores ’ floating and smelting technologies, such as complex operation in ore-dressing, large consumption of floating reagents and incomplete separation of bismuth and molybdenum, a low-temperature smelting on bismuth-molybdenum ores is proposed so that the crude bismuth is produced after low-temperature smelting, and molybdenum comes into the solution in form of molybdate. Then molybdenum trioxide can be recycled which is produced by hydrothermal method. On the basis of thermodynamic analysis, effects of molten salt composition, salt amount, smelting temperature, reaction composition and excessive multiples of active carbon on the molten salt smelting of bismuth-molybdenum ores are investigated. The optimum conditions is determined as follows： w（NaCl） /w （NaCl＋Na2CO3）=20 %, smelting temperature 850 ℃, w（NaCl＋Na2CO3） /w（bismuth-molybdenum ores）=2, reaction time 1 h, w（activated carbon） /w （theory）=2. Two comprehensive tests under above-mentioned optimum conditions are conducted to find out that the direct recovery rate of bismuth is 98.12 % and 96.59 %,and the average grade of crude bismuth is 96.62 % and 98.87 %.