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通过试验研究了钼精矿在真空分解过程中的物相和形貌演变规律。结果表明钼精矿料球在分解过程中由外及内逐层分解,分解过程中料球出现了Mo,Mo_2S_3,Mo S_23层,且获得的钼产品呈疏松多孔海绵状。Mo S_2的分解遵循逐步分解的原则,即Mo S_2先分解为Mo_2S_3,然后Mo_2S_3再分解为Mo。升高温度,有利于钼精矿的分解。在压力为10~20 Pa时,钼精矿在1423 K已经开始分解;在1523 K时料球外层有明显Mo_2S_3生成;在1573 K时已有金属Mo生成;至1773 K下分解2 h,分解反应已完毕,得到了海绵态的金属钼和硫磺产品。所得到的金属钼产品钼含量达到93.69%,杂质元素含量很低,主要杂质为Si O_2和Ca O。进一步控制分解过程条件,所得到的金属钼产品中的钼含量可达到97%以上。分解过程中硫磺可采用冷凝或者液化的方式回收,回收率达到98.20%,得到的硫磺质量较高,硫含量达到98.60%,接近工业硫磺标准。
The phase transformation and morphology evolution of molybdenum concentrate during vacuum decomposition were studied through experiments. The results showed that the molybdenum concentrate balls decomposed layer by layer from the outer layer to the inner layer during the decomposition process. Mo, Mo_2S_3 and Mo_S_23 spheres appeared during the decomposition process, and the molybdenum products obtained were porous and sponge-like. The decomposition of Mo S 2 follows the principle of gradual decomposition, that is Mo S 2 decomposes first into Mo 2 S 3 and then Mo 2 S 3 decomposes into Mo. Elevated temperature is conducive to the decomposition of molybdenum concentrate. When the pressure is 10 ~ 20 Pa, the molybdenum concentrate begins to decompose at 1423 K; at 1523 K, there is obvious Mo 2 S 3 formation in the outer layer of the spheroidal material; metal Mo is formed at 1573 K; and decomposed at 1773 K for 2 h, Decomposition reaction has been completed, the sponge state molybdenum and sulfur products. The resulting molybdenum metal molybdenum content of 93.69%, low content of impurity elements, the main impurities Si O_2 and Ca O. Further control of the decomposition process conditions, the resulting molybdenum metal molybdenum content can reach more than 97%. During the decomposition process, the sulfur can be recovered by condensation or liquefaction, the recovery rate is up to 98.20%, the quality of the sulfur obtained is higher, and the sulfur content reaches 98.60%, which is close to the industrial sulfur standard.