某烧绿石尾矿选铌试验研究

国外某地含有丰富的烧绿石资源，属碱性碳酸盐矿体，原矿Nb2O5含量大于1%，在经历长流程胺法烧绿石浮选之后，尾矿含Nb2O5较高，铌资源未能得到综合回收，该烧绿石尾矿仍具有较高的回收价值。由于该尾矿长期在尾矿库堆存，药剂污染严重、含泥量较大，本工艺预先采用“磨矿擦洗-脱泥”的工艺改善其浮选性质，然后通过“磁选-脱钙”的工艺进行杂质矿物抛废，最终采用螯合类组合捕收剂实现烧绿石的选择性高效捕收。在原料Nb2O5品位0.71%的条件下，获得了Nb2O5品位55.07%、回收率38.23%的烧绿石精矿，尾矿中烧绿石资源得到回收。     

废SCR脱硝催化剂钒钨提取研究进展

含有钒、钨和钛的选择性催化还原催化剂在许多工业应用中被广泛还原氮氧化物。各行业脱硝催化剂正在进入报废更换高峰期,处理废催化剂回收有价金属迫在眉睫。将回收的钒、钨、钛用于生产新型催化剂或其他产品,可形成循环经济。对废脱硝催化剂钒钨提取工艺进行详细综述,重点介绍钒钨浸出和钒钨分离方法。     

嗜热硫氧化硫化杆菌与喜温嗜酸硫杆菌混合浸出铁闪锌矿研究

采用正交试验, 通过考察温度、pH值、喜温嗜酸硫杆菌接种时间和喜温嗜酸硫杆菌接种浓度4个因素, 研究硫氧化硫化杆菌与喜温嗜酸硫杆菌混合菌对铁闪锌矿浸出的影响。试验结果表明: 氧化硫细菌的加入, 有助于消除铁闪锌矿浸出过程中生成的、覆盖在矿物表面的元素硫, 使得硫氧化硫化杆菌和喜温嗜酸硫杆菌混合菌浸出铁闪锌矿的效果比单一硫氧化硫化杆菌浸出效果好; 混合菌浸出铁闪锌矿时浸出率达到54.2%, 而单一硫氧化硫化杆菌浸出时浸出率为46.8%。正交试验结果统计分析表明混合菌浸出铁闪锌矿的最优条件为: pH=1.8、第3 d接种喜温嗜酸硫杆菌和喜温嗜酸硫杆菌接种浓度2.5×10⁶个/mL; 其中pH值是影响混合菌浸出铁闪锌矿的主要因素, 其次是喜温嗜酸硫杆菌接种浓度及喜温嗜酸硫杆菌接种时间。     

Formation of passivation film during pyrrhotite bioleached by pure L. ferriphilum and mixed culture of L. ferriphilum and A. caldus

Bioleaching and electrochemical experiments were conducted to evaluate pyrrhotite dissolution in the presence of pure L.ferriphilum and mixed culture of L. ferriphilum and A. caldus. The results indicate that the pyrrhotite oxidation behavior is the preferential dissolution of iron accompanied with the massive formation of sulfur in the presence of L. ferriphilum, which significantly hinders the leaching efficiency. Comparatively, the leaching rate of pyrrhotite distinctly increases by 68% in the mixed culture of L. ferriphilum and A. caldus at the 3rd day. But, the accumulated ferric ions and high p H value produced by bioleaching process can give rise to the rapid formation of jarosite, which is the primary passivation film blocking continuous iron extraction during bioleaching by the mixed culture. The addition of A. caldus during leaching by L. ferriphilum can accelerate the oxidation rate of pyrrhotite, but not change the electrochemical oxidation mechanisms of pyrrhotite. XRD and SEM/EDS analyses as well as electrochemical study confirm the above conclusions.     

嗜铁钩端螺旋菌对黄铜矿表面性质的影响(英文)

通过吸附、动电位、接触角和摇瓶浸出试验研究Leptospirillum ferriphilum菌作用前后黄铜矿表面性质的变化。采用不同能源物质(亚铁和黄铜矿粉)培养L.ferriphilum菌。结果表明,细菌可以很快吸附在黄铜矿表面,并且固体能源物质培养的细菌比液体能源物质培养的细菌可以更多、更快地吸附在矿物表面。与细菌作用后,黄铜矿的等电点朝着细菌等电点的方向移动。在添加与不添加能源物质时,黄铜矿的接触角表现出不同的变化趋势。XRD、SEM/EDS检测表明浸出过程中在黄铜矿表面生成了硫和黄钾铁矾。通过EDS检测可知在黄铜矿的分解过程中,铁优先从黄铜矿表面释放出来。在浸出过程中黄铜矿表面生成了钝化层,从而导致其浸出率很低。通过研究推测钝化层的主要成分是硫,而不是黄钾铁矾。     

N-丙基-N′-乙氧羰基硫脲对黄铜矿和黄铁矿的浮选及其电化学行为（英文）

通过浮选试验,比较N-丙基-N′-乙氧羰基硫脲(PECTU)和丁基黄药(BX)对黄铜矿和黄铁矿浮选行为的影响,并利用动电位测试和电化学方法研究乙氧羰基硫脲与黄铜矿和黄铁矿的作用机理。浮选试验结果表明,相对于丁基黄药,乙氧羰基硫脲表现出对黄铜矿更强的捕收能力以及更好的选择性。与PECTU作用后,黄铜矿表面zeta电位向正方向移动,证明PECTU在黄铜矿表面发生了吸附。循环伏安曲线和塔菲尔测试结果表明,PECTU与黄铜矿表面相互作用后,吸附在黄铜矿电极表面的PECTU阻碍了黄铜矿自身的氧化和腐蚀。动电位和电化学测试结果表明,在弱碱性条件下,PECTU与黄铁矿几乎无相互作用。     

Bioleaching and electrochemical properties of chalcopyrite by pure and mixed culture of Leptospirillum ferriphilum and Acidthiobacillus thiooxidans

The bioleaching of chalcopyrite was investigated using a pure and mixed culture consisting of iron-oxidizing Leptospirillum ferriphilum (L. ferriphilum) and sulfur-oxidizing Acidthiobacillus thiooxidans (A. thiooxidans). The electrochemical tests were conducted to investigate the bioleaching behavior of chalcopyrite by various bacteria. Bioleaching efficiency of chalcopyrite in mixed culture is higher than that in the pure culture of L. ferriphilum alone. The iron-oxidizing L. ferriphilum plays a dominant role during bioleaching of chalcopyrite in the mixed culture of L. ferriphilum and A. thiooxidans. During bioleaching, certain values of redox potential are beneficial to the decomposition of chalcopyrite. Jarosite and sulfur are observed as products of bioleaching. The addition of A. thiooxidans during leaching by L. ferriphilum can change the electrochemical control steps of leaching. The corrosion current density is substantially promoted in the culture involving bacteria, especially in the mixed culture.     

某锂多金属矿锂钽铌短流程同步富集与分离试验研究

某锂多金属矿含有锂辉石、钽铌锰矿、云母和长石等资源,采用常规重磁浮流程长、工艺复杂、回收率低。本研究采用高效选择性耐低温捕收剂ML和高效捕收剂MT,开发了一种锂钽铌短流程同步浮选与分离工艺,并回收尾矿中的石英长石。在原矿品位Li2O 1.72%、Ta2O5 0.025%的条件下,获得锂精矿Li2O品位6.55%,回收率71.04%;高品位钽精矿Ta2O5品位18.03%,回收率33.40%;低品位钽精矿Ta2O5品位3.21%,回收率9.00%;以及含Li2O 2.07%的云母精矿和高白度石英长石产品。实现了该锂多金属矿的综合回收。