新型阳离子捕收剂对石英的捕收性能及作用机理

用东北大学研制的新型高效阳离子捕收剂DBA-1对石英纯矿物进行了药剂用量、浮选温度、合适酸碱度试验，并借助Zeta电位测定、红外光谱分析和接触角测定对DBA-1浮选石英的机理进行了分析，以检验DBA-1对石英的捕收性能及效果。结果表明：①0.074～0.038 mm粒级石英纯矿物在pH=8.5、矿浆温度为18 ℃、药剂用量为75 mg/L的情况下可获得97.3%的回收率。②在无DBA-1的矿浆中，石英零电点的pH=2.26，而与DBA-1作用后的零电点偏移至10.10，说明DBA-1可以以阳离子形式在石英表面发生静电吸附；DBA-1与石英作用前后的红外光谱分析表明，二者间存在氢键吸附。③DBA-1的添加可大幅度提高石英表面的接触角，增强其表面的疏水性和可浮性，接触角在12.6°～27.0°范围内的小幅增大都会引起回收率的大幅度提高。

Collecting Performance and Mechanism of a New Cation Collector to Quartz

The flotation behavior,including the dosage of collector,the temperature and pH of pulp,on quartz using DBA-1 as a new collector developed by Northeastern University was investigated.Zeta potentials,infrared spectrum analysis and contact angle measurement were used to detect the interaction mechanism of the of the quartz surface with DBA-1,to check out the collecting performance of DBA-1 on quartz.The results show that：①Recovery of 97.3% on quartz flotation is obtained at the optimum conditions of particle size from 0.038 to 0.074 mm,pulp pH 8.5,slurry temperature 18 ℃,and the dosage of collector 75 mg/L.②After adding DBA-1 to the slurry,point of zero charge on quartz surface increased from 2.26 to 10.10.It is indicated that adsorption of DBA-1 occurred on the quartz surface.The adsorption mainly includes electrostatic adsorption and hydrogen bonding adsorption.③The quartz surface contact angle was increased obviously after adding DBA-1,which enhanced its hydrophobicity and floatability,and the recovery rate will be improved significantly when the contact angle slightly raise from 12.6°～27.0°.