羟肟酸协同脂肪酸分离磷灰石和白云石

针对脂肪酸浮选磷矿石存在选择性不强、常温下脂肪酸流动性和分散性差、浮选过程需要加温等不足，考察了羟肟酸协同脂肪酸作用时对溶液黏度、表面张力、ζ电位的影响。结果显示：脂肪酸低温下流动性较差，黏度受温度和搅拌强度影响较大，羟肟酸与脂肪酸混合能有效降低脂肪酸黏度；随着脂肪酸和羟肟酸用量的增加，溶液表面张力均逐渐降低，烷基羟肟酸与脂肪酸混合作用较单一药剂作用时溶液表面张力降低；脂肪酸用量为400 mg/L、烷基羟肟酸添加量为脂肪酸的0.5倍、pH=6时，白云石与磷灰石表面电位差最大。白云石和磷灰石单矿物浮选试验结果表明，脂肪酸用量为400 mg/L、烷基羟肟酸添加量为脂肪酸的0.5倍、pH=6时，白云石与磷灰石回收率差值达到87.88个百分点，比未添加烷基羟肟酸时的差值提高了14.34个百分点，添加烷基羟肟酸可以改善磷灰石和白云石的分离效果。红外光谱分析表明，混合捕收剂与白云石发生物理吸附和化学吸附，与磷灰石只有少量的物理吸附。羟肟酸|脂肪酸|协同作用|磷灰石|白云石|浮选

Synergistic Effect of Fatty Acid and Hydroxamic Acid in Flotation Separation of Apatite and Dolomite

Aiming at the problems of hardly no selectivity,poor liquidity and dispersion of fatby acid at normal tempera-ture,heating was needed in flotation process,influence of hydroxyl oxime acid collaborative fatty acids on solution viscosity,sur-face tension,and Zeta potential were studied. Results indicated that,fatty acid has poor fluidity at low temperature,temperature and revolutions intensiby has a great influence on the viscosity,fatty acid compound alkyl hydroxamic acid can effectively re-duce the viscosity of fatty acid,fatty acid and alkyl hydroxamic acid has strong surface actively,they can effectively reduce sur-face tension of pure water;with fatty acid dosage of 400 mg/L,alkyl hydroxyl oxime acid dosage of fatty acid 0. 5 times,pH=6, dolomite and apatite surface point difference is the largest. Dolomite and apatite single mineral flotation test results show that with fatty acid dosage of 400 mg/L,alkyl hydroxyl oxime acid dosage of fatty acid 0. 5 times,pH=6,dolomite and apatite re-covery difference is 87. 88 percentage points higher than that of no hydroxy oxime acid by 14. 34 percentage points,adding hydrixyl can increase separation index between apatite and dolomite. Mineral infrared spectrum showed that mixed collector with dolomite in physical adsorption and chemical adsorption,with only a small amount of apatite physical adsorption.