锡精矿沸腾焙烧工艺研究

FLUIDIZED BED ROASTING OF TIN CONCENTRATE

锡精矿焙烧脱硫、砷等杂质，世界上普遍采用多膛炉和回转窑。本文研究锡精矿沸腾焙烧工艺和炉型结构，进行了比较系统的试验室试验和５ｍ２沸腾炉焙烧工业试验，解决了在一台沸腾炉内脱硫、脱砷要求的不同气氛和锡精矿因粒度细、粒级宽给沸腾焙烧带来的困难。研究结果（平均值）：脱硫效率９４．８４％，脱砷效率８５．４７％，炉床能力１１．９２ｔ／ｍ２·ｄ，锡在焙砂中的直收率９９．２８％，煤耗３．５％。技术经济指标处于世界先进水平。研究成果已应用于大型炼锡厂的建设和生产。

Multi-hearth furnace and rotary kiln are commonly employed in the world for the roasting of tin concentrate to remove sulphur, arsenic and other impurities.However,the fluidized bed roasting technology and the structure of the furnace are described in this paper.Laboratory experiments and industrial tests with a 5m2 fluidized bed furnace were conducted.The problem in the S and As removal, which requires different atmospheres,was solved in one furnace.The difficulties caused by fine particles and wide size distributions of the tin concentrate during fluidized bed roasting were also overcome. Removal of 98.84% S and 85.47% As can be reached.The recovery of tin during the roasting is 99.28%. The unit capacity is 11.92t/m2d. The coal consumption is 3.5%. This technology has reached the world advanced level and has been put into operation by large tin smelters.