中文摘要：

提出了硫化铋精矿低温碱性熔炼粗铋的新工艺，考察了w（NaOH）／w（Na2CO3）、碱量、温度和时间等因素对熔炼的影响。结果表明，在w（NaOH）／w（Na2CO3）=20／133、碱量为1．64倍理论量、温度800oC、时间1．5h的最优条件下，金属铋的直收率可达94．02％，粗铋含Bi98％，该工艺具有低温、清洁、直收率高等特点。

英文摘要：

A new process for alkaline smelting bismuth sulfide concentrate into rude bismuth at low temperature was proposed. The effects of w（ NaOH）/w（ Na2CO3 ）, the dosage of alkali, temperature and time on smelting were investigated. The results indicate that on the optimum conditions that w（ NaOH）/w（ N%CO3 ） is 20/133, the dosage of alkali is 1.64 times of the theoretical value and 800 ℃ for 1.5 h, the direct recovery of metal bismuth and the content of bismuth in rude bismuth can reach 94.02% and 98% respectively. The process has the advantages of low temperature, cleanness and high direct recovery.