复合捕收剂在铁矿石反浮选中的协同作用

为提升齐大山铁矿浮选指标，研制出一种高效既含N-H又含O-H基团的新型捕收剂DJW-II，用于齐大山铁矿磁选混合精矿反浮选脱硅研究，并考察了JW系列辅助捕收剂对浮选效果的影响。结果显示：在浮选温度21 ℃，pH值为9.0，捕收剂DJW-II粗选用量125 g/t、精选用量50 g/t，辅助捕收剂 JW-4用量0.6 g/t，抑制剂羧甲基淀粉钠用量250 g/t的条件下，采用1粗1精的浮选流程得到产率50.98%、精矿铁品位68.08%、铁回收率69.85%的精矿。添加辅助捕收剂可以改善浮选过程所产生泡沫的体积、半衰期及泡沫黏度，进而提高浮选指标。构建了所采用辅助捕收剂JW-4的主要成分、水分子及Ca2+离子、Cl-离子的结构，通过Materials Studio软件构建泡沫膜结构的分子模型，并采用Forcite模块，对构建的分子模型进行结构优化及动力学计算。结果表明，加入辅助捕收剂后，捕收剂分子的活性基团与中间的水分子的吸附更为紧密，与气泡性能测试中加入辅助捕收剂后泡沫黏度变大的结果相吻合。

Synergistic Effect of Compound Collector on the Flotation of Iron Ore

In order to improve the flotation indexes of Qidashan iron ore， flotation collector DJW-II which is a new self-made reagent containing both N-H and O-H groups was made to use for research of flotation separation of mixed magnetic separation concentrate， JW series surfactants are used as auxiliary collectors. The results show that under the conditions of the flotation temperature 21 ℃， and pH 9.0， the dosage of collector DJW-II 125 g/t in roughing and 50 g/t in concentration， surfactant JW-4 0.6 g/t， inhibitor carboxymethyl starch sodium 250 g/t， the flotation process of one roughing and one concentration is adopted to obtain flotation concentrate of 50.98% yield， 68.08% grade and 69.85% recovery. The results showed that the flotation concentrate was improved by improving the foam volume， half-life period and foam viscosity， in turn the flotation index was improved. Finally， the structure of compound collectors， water molecules and relative ions Ca2+， Cl-， through Materials Studio software builds a molecular model for the bubble membrane structure， and Forcite module was used to do geometry optimization and dynamics. After adding auxiliary collector， collector molecular reactive group adsorption closer with the middle of the water molecules， and bubble performance test after adding auxiliary collector bubble viscosity change was consistent.