钼精矿焙烧烟道灰中铼的回收

含铼钼精矿经外加热式回转窑焙烧,伴生的稀贵金属铼进入烟尘,采用自激式高效收尘方式和装置进行回收,对焙烧烟尘中的主要成分进行分析,研究了浸出过程的主要影响因素:浸出剂、酸度、温度、时间、液固比等,把回收的含铼钼粉尘进行溶解,通过添加氧化剂,提高铼的浸出率,将含铼溶液,选择强碱性阴离子交换树脂201×7吸附,再用萃取剂萃取,用7N的氨水反萃,铼进入反萃液中,再用氨水解吸、蒸发、结晶得高铼酸铵。该工艺有效的回收了烟尘中的铼,粉尘回收率可达到98%以上,减少粉尘排放,降低环境污染;烟尘中的铼的浸出率在98%以上;溶液中铼的吸附率在99%以上,附铼树脂上铼的解析率在99%以上;铼酸铵纯度≥99.99%,总回收率≥98%;提高了矿产资源综合利用率及经济效益,为企业增加了新的经济增长点。

RECYCLING RHENIUM FROM FLUE DUST IN MOLYBDENUM CONCETRATE ROASTING

Molybdenum concentrate containing rhenium is roasted by the exterior heating type rotary kiln,with associated rhenium going into dust.The dust is collected by auto-excitation type dust collection device.The main ingredient in smoke is analyzed,and the main influencing factors in leaching process is : leaching agent,acidity,temperature,time,the liquid-solid ratio and so on.The recovered molybdenum dust containing rhenium was dissolved,by adding antioxidants,improve rhenium extraction rate,then go into back extraction solutions,choosing strongly basic anion exchange resin 201×7 adsorption,reoccupying extraction solvent extraction,with 7 N ammonia the crafts,rhenium into the crafts in liquid,reoccupy ammonia desorption,vaporization crystallization tall rhenium acid amines.The process of recovery of the effective pricey rhenium smoke,dust recovery can achieve 98% above,reduce dust emissions,reduce the environment pollution;The smoke of the pricey rhenium leaching rate of 98% or more;In the solution of the pricey rhenium adsorption rate of 99% or more,attached on the pricey rhenium resin resolution in the above 99%;Rhenium acid purity of ammonium quartile 99.99%,total recovery quartile 98%;Improve the comprehensive utilization of mineral resources and economic benefit,for the enterprise added new economic growth point.