摘要
以反浮选法分离细粒径硅钙质磷矿中的石英,获得的P2O5品位和回收率都比正浮选法高,其中P2O5回收率提高了大约40%.在烷基胺盐、醚胺盐和季铵盐三种阳离子捕收剂中,以烷基胺盐捕收剂的反浮选效果最佳,P2O5品位和石英去除率可分别提高到30%和60%以上.酸性介质比碱性介质更有利于提高硅钙质磷矿的品位,在碳酸盐脉石存在的情况下,酸性越强的环境越有利于反浮选分离石英.磷酸比硫酸能更好地调节体系的酸性和抑制磷酸盐矿物,且用量较少.优化的捕收剂用量为0.5～1kg.t-1.三种阳离子捕收剂都在矿石表面发生物理吸附,以烷基胺盐的吸附强度最大,所以其具有较好的浮选性能.
Reverse flotation was employed to separate quartz from a phosphate ore with fine particle size which contained siliceous and carbonates gangues.The P2O5 grade and recovery were higher than those by direct flotation,especially the P2O5 recovery increased by about 40%.Compared with ether amine salts and quaternary ammonium salts,alkyl amine salts exhibited better flotation results,the P2O5 grade of concentrates and the quartz removal ratio were higher than 30% and 60%,respectively.Acid reagents were more propitious to improve the grade of the siliceous-calcareous phosphate ore than alkaline reagents.Because of the existence of carbonate minerals,a strong acidity condition was more beneficial to separate quartz by reverse flotation.The application of phosphoric acid as a phosphate depressant and pH modifier gave a better usability in comparison with sulfuric acid,and the dosage of phosphoric acid was less than that of sulfuric acid.The optimum collector dosage was 0.5 to 1kg·t^-1.The three cationic collectors adsorbed on ore surfaces in physical adsorption,and the adsorption of alkyl amine salts was the strongest,which is likely to explain their preferable flotation performance.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2010年第11期1388-1392,共5页
Journal of University of Science and Technology Beijing
基金
国家科技支撑计划资助项目(No.2007BAE58B01)
关键词
磷灰石
磷
石英
浮选
捕收剂
apatite
phosphate
quartz
flotation
collector
