采用常温和较高温分阶段浸出铋精矿低温碱性熔炼渣.研究结果表明:Na2S2O3和Mo主要进入常温浸出液中,而Na2CO3主要进入热浸液中.在温度为300K,液固比为0.75及时间为1h的条件下,进行两段逆流循环浸出后,Mo和Na2S2O3的浸出率分别为82.28％和75.03％,而Na2CO3的浸出率仅为33.13％;常温浸液中n(S2O32-)/n(CO32-)为1.97,实现了Na2S2O3和Na2CO3的初步分离；在温度为313～363 K,液固比不小于l,时间为lh的条件下进行热水浸出,Na2CO3,Na2S2O3及Mo的热浸率分别为94.0％,94.3％和69.0％;它们的两段总浸出率分别为95.99％,98.58％及94.51％.%The two-stage leaching at different temperatures was used to treat alkaline smelting slag of bismuth sulphide concentrate. The results show that molybdenum and Na2S2O3 are mainly leached into the leachate at normal temperature, while Na2CO3 goes into hotter leachate mostly. When two-stage countercurrent leaching is carried out at 300 K for 1 h with the ratio of liquid volume to solid mass of 0.75, the leaching efficiency of Mo and Na2S2O3 are 82.20% and 75.03%, but the leaching efficiency of Na2CO3 is only 33.13%. The n(S2O32-)/n(C032-) reaches up to 1.97 in the leaching solution, indicating primary separation of Na2S2O3 and Na2CO3. The leaching efficiency of Na2S2O3, Na2CO3 and Mo are 94.0%, 94.3% and 69.0% in the hot-leaching process at temperature of 313-363 K, the ratio of liquid volume to solid mass ratio being 1, and time of 1 h. Their total two stage leaching efficiency can reach up to 95.99%, 98.58% and 94.51%, respectively.
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