从反浮选磷尾矿中回收磷的研究

A Resource Recovery Way from Reverse Floatation Tailings of Phosphate Rock

以云南晋宁磷尾矿为研究对象，观察尾矿显微照片发现不同矿物颗解离不充分，通过煅烧、破碎使得矿物颗粒分离，再进行气流分级最终实现磷尾矿中的磷回收。分别在800℃、850℃、900℃及1000℃煅烧尾矿并分析煅烧后样品显微照片，得到最佳煅烧温度。将在最佳温度下煅烧尾矿物料在频率为15 Hz条件下破碎，让不同矿物颗粒分离；再对破碎后的尾矿物料在5-40 Hz间按8种频率由大到小依次进行气流分级，对分级后各频率对应物料做XRD衍射测试，并对XRD图谱全谱拟合进行定量分析。结果表明，850℃为最佳煅烧温度，磷尾矿在此温度下煅烧产物分离彻底且磷灰石颗粒结构未垮塌；在5-25 Hz频率P2O5占总P2O5的52.78%。

The object is phosphate tailings from Jinning, Yunnan. It’s discovered that different mineral particles of tailings dissociation of insufifcient through their micrograph. Calcination and crush could separate the mineral grains, air classiifcation realized recovery of phosphorus in phosphate tailings. The tailings were calcined respectively at 800℃, 850℃, 900℃and 1000℃ and their after-calcination micrograph was analyzed to obtain the best calcination tempreture. To separate the mineral grains, calcined tailings were broken at the frequency of 15 Hz, and the brokens were air-classiifed at eight different frequencies between 5 and 40 Hz in descending. The eight classiifed materials were tested by XRD and the entire XRD spectrums were iftted for quantitative analysis. The results show that 850℃ is the best calcination tempreture, at which calcined products disintegrate completely with mineral grains form undestroyed. P2O5 collected at the range of 5-25 Hz accounts 52.78% of the total P2O5.