中文摘要：

对钼精矿焙烧过程进行了热力学分析。结果表明,焙烧反应属于放热反应,反应一旦开始,在工业规模生产条件下完全可以自热进行。热分析实验表明,氧气浓度越高,越有利于钼精矿的转化率提高;物料粒度越小,越有利于焙烧反应完全程度的提高。对传统钼精矿焙烧回转窑的热平衡测试显示,煤作为外热源经燃烧后提供热量为4.42 GJ/t的烟气供入回转窑内,烟气中的氧浓度为10%。由于主反应区温度高,造成物料结块,阻碍了钼精矿的焙烧。本研究开发了钼精矿的自热焙烧新工艺,该工艺通过设置换热器回收主反应区放出的化学热,并将预热后的空气用于脱硫区的补热,提高了焙烧气的氧浓度。取消了传统回转窑的燃煤过程,整个焙烧过程仅靠6.45 GJ/t的化学反应热即可维持,没有含碳燃料的输入和CO2的排放,其节能环保效益显著。

英文摘要：

Thermodynamic analysis of roasting process of molybdenum concentrate was conducted in the present work.The results show that the roasting reaction is an exothermic reaction.Once the reaction begins,it may occur spontaneously without any external heat source under industrial production conditions.It is revealed by thermal analysis experiment that higher oxygen concentration is more beneficial for the increase of the conversion rate of molybdenum concentrate,and the molybdenum concentrate with smaller granularity is easier to achieve the complete reaction degree.The thermal test results of conventional rotary kiln present that coal,as an external heat source,provides heat of 4.42 GJ/t by flue gas after combustion,in which the oxygen concentration is 10%.The temperature of main reaction zone is high,which results in the material agglomeration and inhibits roasting of the molybdenum concentrate.A novel self-heated roasting technology has been proposed in the present study.The technology can reduce the temperature of main reaction zone and increase the oxygen concentration in roasting gas via setting up a heat exchanger to recycle the heat released from the roasting process.And the preheated air is fed into the rotary kiln instead of original coal-fired flue gas.The coal combustion in conventional rotary kiln is no longer required in the novel technology.The whole roasting process works only by 6.45 GJ/t from chemical reaction heat.There is no carbon containing fuel input and no CO2 emission.Therefore,it is an energy and environmentally responsible process.