采用循环烟气焙烧高铼钼精矿的工艺研究
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摘要
铼元素主要存在于辉钼矿和铜铼硫化矿中[1],一般都是湿法回收,本文介绍的是干法回收。钼精矿通过600℃加热脱水脱油,采用第一台转鼓控制250℃回收钼铼和元素硫混合物,第二台转鼓控制40℃以下冷凝水蒸气并回收浮选油再生回用。将钼铼硫混合物与脱水脱油后的干燥矿物合并进入循环烟气焙烧炉,在700℃焙烧获得高浓度SO2烟气可以制硫酸,也使钼精矿中的钼铼都能得到彻底升华,采用转鼓冷凝分离回收[2]。
Rhenium is mainly found in molybdenum and copper-rhenium sulphide ore,which is generally wet recovery. Dry recovery was introduced in this paper. Molybdenum concentrate was dehydrated and deoiled by heating at600 ℃. The first barrate was used to control 250 ℃ recovery of molybdenum rhenium and elemental sulfur mixture,the second barrate controlled condensation water vapor below 40 ℃ and the flotation oil was recycled for reuse. The mixture of molybdenum,rhenium and sulfur and dried minerals after dehydration and deoiling were combined into the circulating flue gas calciner. High concentration of SO2 flue gas could be obtained by roasting at 700 ℃ to produce sulfuric acid,and all molybdenum and rhenium in molybdenum concentrate could be sublimated thoroughly. And the barrate was adopted to condense,separate and recover.
Rhenium is mainly found in molybdenum and copper-rhenium sulphide ore,which is generally wet recovery. Dry recovery was introduced in this paper. Molybdenum concentrate was dehydrated and deoiled by heating at600 ℃. The first barrate was used to control 250 ℃ recovery of molybdenum rhenium and elemental sulfur mixture,the second barrate controlled condensation water vapor below 40 ℃ and the flotation oil was recycled for reuse. The mixture of molybdenum,rhenium and sulfur and dried minerals after dehydration and deoiling were combined into the circulating flue gas calciner. High concentration of SO2 flue gas could be obtained by roasting at 700 ℃ to produce sulfuric acid,and all molybdenum and rhenium in molybdenum concentrate could be sublimated thoroughly. And the barrate was adopted to condense,separate and recover.
引文
[1]范小祥,刘玲.从钼矿中提取铼的工艺改进及研究进展[J].中国钼业,2015,39(6):29-31.
[2]伍耀明.一种新型钼精矿焙烧炉工艺设计初探[J].中国钼业,2016,40(6):17-27.
[3]冶金工业部工业教育司.稀有金属冶金学(上册)[M].北京:中国工业出版社,1962:90.
[2]伍耀明.一种新型钼精矿焙烧炉工艺设计初探[J].中国钼业,2016,40(6):17-27.
[3]冶金工业部工业教育司.稀有金属冶金学(上册)[M].北京:中国工业出版社,1962:90.