褐铁矿浮选的有效捕收剂及其机理研究

研究了油酸钠、731、苯甲羟肟酸、C_7~9羟肟酸等几种代表性捕收剂对褐铁矿、萤石、高岭土、石英等纯矿物的浮选。结果表明: 油酸钠是褐铁矿的良好捕收剂, 当油酸钠用量为3×10^-4 mol/L, pH值为6.5～10.5时, 褐铁矿可浮性最好。机理研究表明: 在试验pH值范围内, 油酸钠在褐铁矿表面产生了显著的吸附, 表面零电点由pH=8.0左右漂移至pH=3.0左右。在pH=2.0～4.0的范围内, 油酸根在褐铁矿表面发生静电吸附, 油酸分子在褐铁矿表面以氢键作用为主; 当pH=4.0～10.5时, 油酸根与褐铁矿表面铁质点间以化学作用为主, 红外光谱分析显示其作用产物为油酸铁。

Effective Collectors for Limonite Flotation and Mechanism therein

Using representative collectors such as sodium oleate, oxidized paraffin soap(731), benzyl hydroxamic acid and C_7~9 hydroxamic acid, flotation tests on pure minerals of limonate, calcite, kaolinite and quartz were carried out. The results show that the sodium oleate is a good collector for limonite flotation, as, with a sodium oleate dosage of 3×10^-4 mol/L, limonite shows the best floatability with the pulp pH of 6.5～10.5. Mechanism study shows that sodium oleate can be adsorbed significantly onto limonite within the test pH range, and the PZC of limonite shifts from pH=8.0 to pH=3.0. Electrostatic adsorption between oleate and limonite and hydrogen bonding between oleic molecular and limonite are the major mechanisms in a pH range of 2.0～4.0; while in pH range of 4.0～10.5, chemical reaction between oleate and iron play the dominant role, and the infrared spectroscopic analysis shows that the reaction product of sodium oleate and limonite should be ferrous oleate.