CAJ | 학술논문

以白钨矿、萤石和方解石为研究对象，通过单矿物浮选试验、动电位测试及XPS能谱分析，研究硅酸钠对含钙矿物浮选行为的影响及作用机理。浮选实验结果表明：在捕收剂731的作用下，pH值为9.7~10.3、硅酸钠浓度高于2.5 g/L时，白钨矿的回收率大于80%，而萤石和方解石的回收率分别低于10%和26%。Zeta电位检测结果表明：硅酸钠与矿物作用后，萤石和方解石的Zeta电位明显负移，而白钨矿的Zeta电位改变较小，说明硅酸钠更容易在萤石和方解石表面发生吸附。XPS能谱分析显示：硅酸钠与矿物作用后，在萤石和方解石表面出现了Si 2p特征峰，并且其相对含量分别为6.81%和4.72%，而Si在白钨矿表面的的相对浓度仅为0.35%；同时，白钨矿、萤石和方解石表面的Ca 2p 3/2结合能偏移量分别为0.26、0.41和0.55 eV，说明硅酸钠在白钨矿表面可能发生了物理吸附，而在萤石和方解石表面发生了强烈的化学吸附。因此，硅酸钠能选择性抑制萤石和方解石，有效地分离白钨矿与萤石和方解石。
이백오광、형석화방해석위연구대상，통과단광물부선시험、동전위측시급XPS능보분석，연구규산납대함개광물부선행위적영향급작용궤리。부선실험결과표명：재포수제731적작용하，pH치위9.7~10.3、규산납농도고우2.5 g/L시，백오광적회수솔대우80%，이형석화방해석적회수솔분별저우10%화26%。Zeta전위검측결과표명：규산납여광물작용후，형석화방해석적Zeta전위명현부이，이백오광적Zeta전위개변교소，설명규산납경용역재형석화방해석표면발생흡부。XPS능보분석현시：규산납여광물작용후，재형석화방해석표면출현료Si 2p특정봉，병차기상대함량분별위6.81%화4.72%，이Si재백오광표면적적상대농도부위0.35%；동시，백오광、형석화방해석표면적Ca 2p 3/2결합능편이량분별위0.26、0.41화0.55 eV，설명규산납재백오광표면가능발생료물리흡부，이재형석화방해석표면발생료강렬적화학흡부。인차，규산납능선택성억제형석화방해석，유효지분리백오광여형석화방해석。
The flotation behavior and mechanism of sodium silicate on scheelite, fluorite and calcite were investigated by flotation tests, Zeta potential and XPS. The flotation experiment results show that the recovery of scheelite is higher than 80%, but the recoveries of fluorite and calcite are less than 10%and 26%, respectively, when Na2SiO3 dosage is greater than 2.5 g/L with collector 731 in the pH range of 9.7-10.3. The results of Zeta potential measurement show that Zeta potentials of scheelite shift negatively a little, however, the Zeta potentials of fluorite and calcite shift to more negative values in presence of sodium silicate, which indicates that sodium silicate is more easily adsorbed on the surface of fluorite and calcite. The results of XPS show that the Si 2p peaks are found on the surface of fluorite and calcite in presence of sodium silicate, and Si relative contents are 6.81%and 4.72%, respectively, but the Si relative concentration on the scheelite surface is only 0.35%, and Ca 2p 3/2 binding energy shifts of scheelite, fluorite and calcite are 0.26, 0.41 and 0.55 eV, respectively. According to the results of XPS, it can be concluded that sodium silicate is absorbed on the scheelite surface by physical adsorption, but it is absorbed on the fluorite and calcite surface by chemical adsorption. Therefore, sodium silicate can be used to separate scheelite from fluorite and calcite for selective depression fluorite and calcite.