组合羟肟酸下方解石和萤石中浮选氟碳铈矿的分离机理

苯甲羟肟酸(BHA)和辛基羟肟酸(OHA)以及二者组合羟肟酸(BHA+OHA)下,对氟碳铈矿、方解石、萤石三种矿物进行了浮选研究。通过红外光谱分析、总有机碳和紫外光谱吸附量测试和XPS分析研究了羟肟酸类在矿物表面的作用机理。结果表明:在pH=9.5、组合捕收剂(n(BHA)∶n(OHA)=2∶1)浓度为3×10^(-4) mol/L和盐化水玻璃3×10^(-3) mol/L条件下,氟碳铈矿、方解石和萤石的回收率分别为89.8%、18.5%和13.7%,人工混合矿REO品位由28.90%提升至55.41%,氟碳铈矿的回收率为80.41%,与方解石和萤石实现较好分离;组合捕收剂(BHA+OHA)在三种矿物表面发生共吸附,且组合捕收剂中每种药剂的吸附率大于相同浓度的单一药剂;盐化水玻璃阻碍捕收剂在方解石、萤石表面的吸附对捕收剂在氟碳铈矿表面吸附无影响,可以达到抑制方解石和萤石的目的,实现氟碳铈矿的选择性浮选。

提高某白钨矿石浮选指标试验

江西某矽卡岩型白钨矿石WO_3品位为0.26%,白钨矿大部分浸染在石英、萤石、方解石颗粒中,单体解离困难。现场在磨矿细度为-0.074 mm占80%的情况下采用1粗2扫常温浮选,1粗5精2扫加温浮选,中矿顺序返回流程处理,仅能获得WO_3品位为59.31%、WO_3回收率为58.64%的钨精矿。为了提高该矿石的选矿指标,试验以苯甲羟肟酸+油酸钠为白钨矿常温浮选混合捕收剂,进行了阶段磨选工艺条件研究。结果表明,矿石在磨矿细度为-0.074 mm占80%的情况下采用1粗2扫常温浮选,常温浮选精矿再磨细度为-0.074 mm占90%的情况下采用1粗5精2扫加温浮选,最终获得了WO_3品位为62.31%、WO_3回收率为71.62%的钨精矿,钨精矿WO_3品位提高3个百分点,WO_3回收率提高12.98个百分点,精矿指标提高显著。

Effects of particle size and particle interactions on scheelite flotation

Effects of size distribution (particle size and content of fine fraction (<10μm)) on scheelite flotation were studied using flotation tests and theoretical calculations. The results show that particle size influences the scheelite recovery and the performance of combined reagents. The scheelite recovery is lowered by adding fine particles (<10μm) into the pulp containing coarse particles. Extended DLVO (EDLVO) theory confirms that the fine fractions (<10μm) could interface with the coarse fractions. The interaction energy and fluid forces are relative to the particle size, which might explain why the fine fractions influence the scheelite flotation. The highest recovery of scheelite using combined reagents as collector and optimum ratio of combined reagents were determined by scheelite particle size and reagent performance. However, the optimum adding order was only determined by reagent performance, which has nothing to do with particle size.