Investigation into the flotation response of refractory molybdenum ore to depressant mixtures:A case study

In this paper, bulk flotation followed by separation was investigated to concentrate purified molybdenite product from Jinduicheng molybdenum ores(Shanxi province, China). The bench scale tests mainly focussed on separation of molybdenite from other sulfide minerals using the new type of depressants.The effect of each single depressant, including organic depressant-modified dextrin(MD), P-Nokes reagent(PN) and sodium trithiocarbonate(ST), and their mixtures on galena, chalcopyrite and other sulfide ores, was examined in turn by changing the concentrations used in cleaner flotation tests. Closed circuit experiments were carried out under the optimal condition and satisfying recovery and grade of molybdenite concentrate could be achieved(86.294% and 53.157%, respectively). A potential reagent regime was developed, with more environmental friendly and more economical advantages due to the introduction of modified dextrin.     

安徽某钼矿浮选工艺研究

根据安徽某钼矿的矿石性质,进行了选矿试验研究.针对该辉钼矿嵌布不均匀、解离比较困难的特点,试验采用了粗选磨矿细度-0.074mm75%,水玻璃分散抑制矿泥脉石,钼硫混合浮选的工艺流程.粗精矿分别经过一段再磨和两段再磨后五次精选对比,结果表明,粗精矿采用一段再磨精选后便可获得合格钼精矿.在优化多种工艺条件的基础上进行了闭路试验,采用一粗二扫,粗精矿再磨,六次精选工艺便可获得钼品位50.30%、回收率81.18%的钼精矿.      

提高某难选钼矿回收率的途径

陕西某难选钼矿石氧化率高、泥化严重。采用一粗二扫的浮选流程,用煤油作捕收剂、松醇油作起泡剂,获得含钼７．９３％ 的钼粗精矿,回收率为８２．７６％ 。再在球磨机中加适量水玻璃作分散剂,通过硫化钠诱导浮选,可获得含钼５．３１％ 的粗精矿,回收率为８５．５３％ ,与前者相比回收率提高了２．７７％ 。     

辽宁某难选钼矿石浮选试验

辽宁某难选钼矿石主要有用矿物为辉钼矿,脉石矿物为石英、长石、绿泥石、方解石、铝土矿等,矿石中主要有价金属元素为钼。为合理开发利用该资源,采用阶段磨矿、阶段浮选工艺对该矿石进行了选矿试验。结果表明,采用原矿磨细至-0.071 mm占60%,在水玻璃用量为2 000 g/t、煤油用量为200 g/t、2号油用量为70 g/t条件下粗选,粗精矿细磨至-0.071 mm占94%,经3次精选,粗选尾矿经1次扫选的流程,可以获得钼品位为45.25%、回收率93.56%的钼精矿,为合理开发利用该矿石提供了依据。     

粤东金坑锡铜多金属矿区花岗岩锆石U-Pb年龄和辉钼矿Re-Os年龄及其地质意义

广东揭西县金坑铜锡多金属矿床位于粤东地区西北部莲花山断裂带南西段,是粤东锡铜多金属成矿带近年来发现的一处中—大型铜锡铅锌多金属矿床。采用LA-ICP-MS锆石U-Pb法和辉钼矿Re-Os法对矿区与成矿有关的细粒花岗岩及与锡石共生的辉钼矿进行定年,获得该矿床成岩年龄为(141.0±0.3)Ma,辉钼矿Re-Os同位素年龄为(141.3±1.0)Ma,两者年龄接近,表明成岩成矿关系最为密切。并结合细粒花岗岩主微量元素分析结果表明细粒花岗岩具有高硅富碱特点,属于高分异的I型花岗岩,这种岩浆演化末端产物细粒花岗岩有利于成矿金属元素富集,为本区成矿提供巨量的物源与热源。结合成岩成矿年龄研究与主微量分析,初步认为成矿地质体为早白垩世细粒花岗岩,并探讨该矿床的成因及其成矿动力学背景。     

辉钼矿湿法浸出新工艺研究

在常压下，研究了二氧化锰对辉钼矿的湿法氧化浸出新工艺。该法较现行的高压氧煮、硝酸法具有节能、投资小、效益高等特点。     

Depressing effect of flocculants on molybdenite flotation

The quality of recycled process water is an important issue in the flotation of Cu–Mo ores. Processing of Cu–Mo ores includes two steps: a bulk flotation where molybdenite is recovered together with Cu sulfides, and a subsequent selective flotation step where molybdenite is separated from depressed copper sulfides. Flocculants are usually employed in the middling thickeners in the copper plant, and in the Cu–Mo bulk concentrate ahead of the molybdenite plant. However, the floatability of molybdenite, similarly to other naturally hydrophobic minerals, is highly sensitive to the presence of both natural and synthetic polymers. In this work flotation tests demonstrate that conventional flocculants, high-molecular weight anionic polyacrylamides (PAM), are strong molybdenite depressants. Low-molecular weight shear degraded polyacrylamides in spite of losing flocculation efficiency maintain depressing ability for molybdenite. Also a non-ionic flocculant, polyethylene oxide (PEO), has been studied in this project. Our results indicate that PEO is an efficient flocculant for molybdenite suspensions in a wide pH range. However, similarly to polyacrylamides, the PEO flocculant also depresses molybdenite flotation.     

辉钼矿非氧化焙烧工艺的热力学分析

通过热力学研究了几种非氧化焙烧工艺处理辉钼矿的可行性工艺路线。采用高温真空分解法直接处理辉钼矿得到金属钼粉,可以直接用于炼钢,适宜的分解条件为:温度为1 700~1 900 K以及真空度小于100 Pa;气体产物硫可在392~490 K进行液化回收。选用氧化钙作固硫剂,碳作还原剂还原辉钼矿,可以得到Mo、Mo2C和CaS混合物,适宜的反应温度应控制在1 200 K以上。选用碳酸钠固硫剂,碳作还原剂还原辉钼矿,产物为Mo、Mo2C和Na2S,通过水洗可以得到纯度较高的钼粉,适宜反应温度应控制在900~1 100 K。     

非极性表面矿物滑石与辉钼矿浮选分离中的多糖抑制

多糖作为非极性矿物表面抑制剂应用非常普遍,但关于其抑制机理和影响其抑制的因素研究还未完善。将国内外有关采用糊精、羧甲基纤维素（CMC）、木质素磺酸盐及古尔胶抑制滑石和辉钼矿的研究进行了总结,介绍了多糖抑制剂抑制非极性表面的研究进展,并从浮选分离滑石和辉钼矿的角度分析了这4种有机抑制剂对这2种矿物抑制的影响因素和抑制效果。研究表明,多糖的抑制效果不仅与矿浆的pH值、离子强度和离子种类有关,还与多糖分子的特性有关;在2种矿物的浮选分离方面,除了木质素磺酸盐能够高效率地分离滑石和辉钼矿外,十二烷在辉钼矿表面的吸附可有效阻止木质素磺酸盐的吸附,使木质素磺酸盐也可能成为滑石和辉钼矿有效分离的抑制剂;多糖对2种矿物的抑制不能仅从吸附量方面阐释,更重要的是多糖吸附层的特性;关于多糖的吸附机理则存在争议,主要有疏水力论、静电力论、化学力论、氢键和羟基作用论,或它们的综合作用论。     

陕西某难选钼矿工艺矿物学研究

对陕西某难选钼矿石进行了工艺矿物学研究。结果表明,矿石中金属矿物组成较简单,脉石矿物种类繁多;钼是矿石中唯一有回收价值的元素,硫化钼占总钼的90.26%,主要以辉钼矿形式存在;辉钼矿主要以充填裂隙的形式存在,颗粒发育不完整、粒度较小、分布不均、解离难度大、分选困难;采用阶段磨选工艺回收钼矿物,既有利于减少磨矿功耗和药剂消耗,又有利于提高分选指标。