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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第9期    总第265期    2016年9月

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文章编号:1672-7207(2016)09-2929-07
高硫铝土矿悬浮态焙烧及焙烧矿的溶出性能
赵博,陈延信,酒少武,韩丁,杨潘

(西安建筑科技大学 材料与矿资学院,陕西 西安,710055)

摘 要: 为了验证高硫铝土矿悬浮态焙烧工艺及装置的可靠性和长期稳定性,为工业生产线的设计提供必要的工艺和设备结构参数,在基础研究和中试条件试验的基础上,以黔北地区全硫(ST)质量分数1.93%的一水硬铝石型高硫铝土矿为原料,进行750 kg/h规模的连续性验证试验。研究结果表明:悬浮炉内轴向温度650~460 ℃,粉料在炉内有效停留时间约3 s,所得焙烧矿中硫化物型硫的平均质量分数为0.05%,ST质量分数小于0.3%。在溶出温度260 ℃、溶出时间60 min、石灰添加量9%、苛性碱质量浓度236 g/L、溶出液Na和Al分子比1.50的条件下,焙烧矿相对溶出率接近99.5%,相对于原矿,溶出效果得到提高。

 

关键词: 高硫铝土矿;高固气比;悬浮态焙烧;连续性试验;溶出率

Suspended roasting of high sulfur bauxite and leaching performance of roasted ore
ZHAO Bo, CHEN Yanxin, JIU Shaowu, HAN Ding, YANG Pan

School of Materials and Mineral Resources, Xi’an University of Architecture and Technology, Xi’an 710055, China

Abstract:In order to verify the reliability and long-term stability of roasting process and device of high sulfur bauxite, to provide the device structure and process parameters for the design of industrial production line, the 750 kg/h consecutive experiment was conducted by high sulfur bauxite raw ore(1.93% sulfur) from the north Guizhou province based on basic research and pilot test. The results show that when axial furnace temperature is between 650 ℃ to 470 ℃, and the effective powder resident time is about 3 s, the average sulfide sulfur content of roasted ore is decreased to 0.05%, and total sulfur content is decreased to less than 0.3%. Digestion rate of roasted ore is also tested. Among the parameters in test ranges, the digestion temperature is 260 ℃; the digestion time is 60 min; the lime content is 9%; the caustic concentration is 236 g/L and the stripping liquid molecular ratio is 1.50; the relatively leaching ratio closes to 99.5%. Compared with raw ore, the leaching capacity of roasted ore is greatly improved.

 

Key words: high sulfur bauxite; high solid-gas ratio; suspension roasting; consecutive experiment; leaching ratio

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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