陕西省煤飞灰中稀土稀散元素含量特征

CHARACTERISTICS OF RAREEARTH DISPERSED ELEMENTS IN COALFLY ASH IN SHAANXI PROVINCE

煤飞灰被称为“城市矿产”。欧盟已将煤炭作为稀土元素的替代资源,Rocktron公司已开始对英国和波兰的煤飞灰开始稀土元素含量研究。陕西省每年产生超过1500万吨煤飞灰(2014年),煤飞灰或用作水泥添加料、建筑材料等,或作为固废处理,就地掩埋。煤飞灰中含有稀土稀散元素,稀土元素主要为轻稀土,主要元素为La(镧)、Ce(铈)和Nd(钕)。在调查的企业中韩城二电厂煤飞灰中稀土含量最高为458.49×10﹣6;蒲城电厂煤飞灰中稀散元素Ga(镓)为53×10﹣6。

Coal fly ash is called“urban mineral”.The EU has used coal as a substitute for rare earth elements and Rocktron company has begun studying rare earth elements in coal fly ash in Britain and Poland.Coal fly ash is produced over 15 million tons each year in Shaanxi Province(2014)and the coal fly ash was commonly used as cement additive,building material or as solid waste to be buried in situ.Coal fly ash contains rare earth elements mainly bearing La(lanthanum),Ce(cerium)and Nd(neodymium).Among the investigated enterprises,the content of rare earth elements in coal fly ash of Hancheng Power Plant No.2 is 458.49×10﹣6,and that of Pucheng Power Plant is 53×10﹣6 of Ga(gallium).