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中南大学学报(自然科学版)

Journal of Central South University

第32卷    第5期    总第141期    2001年10月

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文章编号:1005-9792(2001)05-0487-04
辉钼精矿熔盐氧化工艺研究
———Na2MoO4-Na2SO4体系
孙培梅,刘茂盛,申 慧,李运姣

(中南大学冶金科学与工程系,湖南长沙 410083)

摘 要: 对辉钼精矿在Na2MoO4-Na2SO4体系的熔盐氧化过程进行了研究,探索了不同的工艺参数对钼的转化率和脱硫率的影响.研究结果表明,在熔盐组成Na2MoO4与Na2SO4质量比为3∶1,配料比为1∶10(质量比),温度为700℃,鼓风速度为1.66 m/s,鼓风时间为20 min的条件下,脱硫率可达99%以上;得到的熔盐经水浸和碱浸后,钼以Na2MoO4形态进入溶液,钼的总浸出率可达95.5%以上;硫以SO2的形态进入气相,烟气中的SO2体积分数可达5.4%以上,可用于制酸;含钼渣和浸出液蒸发结晶得到的Na2SO4晶体可返回再用;熔盐氧化过程采用连续操作分批加料方式,可提高生产能力.

 

关键字: 辉钼精矿; Na2MoO4-Na2SO4体系;熔盐氧化

Melting salt oxidation technology
of molybdenite concentrate
SUN Pei-mei,LIUMao-sheng,SHENHui,LI Yun-jiao

Department of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

Abstract:The melting salt oxidation of molybdenite in Na2MoO4-Na2SO4 system was studied. The effect of processing parameters on the conversion ratio of molybdenum and sweetening ratio was explored. The results show that, under the conditions of melting salt constitution 3∶1(quality ratio),burden ratio 1∶10, 700℃, the velocity of air blast 1.66 m/s,and the time of air blast 20 min, the sweetening ratio could reach over 99%. When melting products were leached with water and soda solution, the molybdenum in the concentrate was transferred into the solution in the form of Na2MoO4 ,and  the leaching ratio of molybdenum could reach over 95.5%. The amount of sulfur in flue gas in the form of SO2 could reach 5.4% and could be used to prepare acid. The residue containing molybdenum and Na2SOcrystal obtained by evaporation of leaching solution could be reused. Using continuative processing and batch burden could increase production.

 

Key words: molybdenite concentrate; Na2MoO4-Na2SO4 system; melting salt oxidation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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