(1. 福州大学 紫金地质与矿业学院，福州 350108；
2. 中南大学 资源加工与生物工程学院，长沙 410083；
3. 东北大学 资源与土木工程学院，沈阳 110819)
摘 要: 在十二胺捕收剂浮选体系下，通过单矿物与人工混合矿浮选试验，考察了乙酰丙酮对菱镁矿一步反浮选脱硅脱钙的影响，并通过对药剂作用前后矿物表面Zeta电位及红外光谱的分析，探讨了乙酰丙酮对菱镁矿浮选脱硅脱钙的作用机理。结果表明：乙酰丙酮对菱镁矿具有一定的抑制作用，对白云石和石英作用不明显，乙酰丙酮对菱镁矿反浮选脱硅脱钙具有较好的分选效果；乙酰丙酮在菱镁矿表面形成较在白云石表面更多的含镁络合物，吸附量大且稳定，使其矿物表面正电性增强，不利于捕收剂十二胺在菱镁矿表面的吸附，从而对菱镁矿产生较强的抑制作用；乙酰丙酮在石英表面几乎不吸附，但不影响十二胺在石英表面的吸附。
关键字: 乙酰丙酮；十二胺；菱镁矿；一步反浮选；脱硅脱钙
（1. Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China;
2. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
3. College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China）
Abstract:Under the flotation system of dodecylamine collector, the effects of acetylacetone on desilication and decalcification from magnesite by one-step reverse flotation were investigated through the flotation test of single mineral and artificial mixed ore. The mechanisms of acetylacetone on flotation desilication and decalcification of magnesite were discussed through the analysis of mineral surface Zeta potential and infrared spectra before and after the action of reagent. The results show that acetylacetone has a certain inhibitory effect on magnesite, but has no obvious effect on dolomite and quartz. Acetylacetone has a good separation effect on reverse flotation desilication and decalcification of magnesite. Acetylacetone forms more magnesium containing complexes on the surface of magnesite than on the surface of dolomite. The adsorption capacity is large and stable, which enhances the positive electricity of the mineral surface, and is not conducive to the adsorption of collector dodecylamine on the surface of magnesite, resulting in strong inhibition of magnesite. Acetylacetone hardly adsorbs on the surface of quartz, it does not affect the adsorption of dodecylamine on the surface of quartz.
Key words: acetylacetone; dodecylamine; magnesite; one-step reverse flotation; desilication and decalcification
