浑浊红球菌对锡石的浮选性能及作用机理

研究了以浑浊红球菌为微生物浮选捕收剂时锡石、方解石和石英砂纯矿物的浮选回收率。结果表明,在pH=4、浑浊红球菌浓度1.24 g/L时,3种矿物的回收率分别为82.07%、45.42%和13.66%。通过表面电位和表面张力测定等手段探究了浑浊红球菌捕收剂分子与锡石表面作用机理。并以浑浊红球菌为捕收剂、水玻璃为抑制剂,对实际锡矿进行了开路浮选实验,锡精矿锡品位由3.98%提高到了23.83%。     

缅甸某锡矿脱硫选锡试验研究

缅甸某含硫锡矿有用矿物嵌布粒度细,主要有价元素为锡和硫,其中,锡含量为2.94%、硫含量为9.65%。试验采用先脱硫后选锡的浮选工艺流程,实现了硫和锡的高效回收。结果表明,在其他条件最佳的情况下,使用新型活化剂X-45(ZL201010124710.7)、KT-51 (ZL201610148276.3)活化硫和锡,最终得到硫精矿的品位和回收率分别为36.68%和94.02%,锡精矿的品位和回收率分别为21.06%和60.27%。该研究可为该类含硫锡矿资源的有效开发利用提供技术支撑。     

Knoop Microhardness Anisotropy of Single-Crystal Cassiterite (SnO2)

The Knoop microhardness anisotropy of single-crystal cassiterite (SnO₂) was measured on the (100), (110), (001), and (111). That anisotropy is depicted as the microhardness profiles for those planes. The results are addressed first in terms of the elastic anisotropy of SnO₂ and then on the basis of the effective resolved shear stress (ERSS), the latter an approach initially advanced by Brookes and co-workers. The load dependence of the Knoop microhardness is also evaluated in terms of the classical Meyer's law for which it is demonstrated that the Meyer's law coefficient and Meyer's law exponent are related.     

巴里选厂流程优化设计研究

介绍了巴里选厂现有的生产工艺流程，并对影响现有流程锡回收率的原因进行分析，通过对流程中磨矿分级工艺、细泥浮选工艺的改进，提高了选厂的锡回收率。     

柠檬酸对锡石浮选行为的影响及其作用机理分析

通过浮选试验考察了柠檬酸对水杨羟肟酸体系中锡石浮选行为的影响,并结合接触角检测、动电位检测和溶液化学计算分析了其作用机理。在7pH9范围内,以200mg/L水杨羟肟酸为捕收剂浮选,锡石回收率达到80%以上。在pH4时,柠檬酸会对锡石产生明显的抑制作用;柠檬酸用量50mg/L、pH=7条件下,锡石回收率仅为25.3%。锡石表面接触角为33°,加入水杨羟肟酸后锡石接触角升高至120°,柠檬酸的作用又使接触角下降至44°。动电位检测和溶液化学计算表明水杨羟肟酸和柠檬酸均可以化学吸附在锡石表面。柠檬酸一方面增强了锡石表面的亲水性,另一方面减少了水杨羟肟酸在锡石表面的吸附,这两方面的作用使锡石在浮选过程中受到抑制。     

重选—浮选工艺回收云南某硫化铅尾矿中的微细粒锡石

采用重选—浮选联合工艺对云南某硫化铅尾矿中的微细粒级锡石进行回收研究。该矿泥化严重,首先采用离心选矿机脱除微细粒矿泥,以消除矿泥对后续锡浮选的不利影响,并能增加浮选给矿锡品位,离心选矿可以使锡品位富集5倍以上,作业回收率达到87.4%。离心精矿进行反浮选脱硫,脱硫精矿采用碳酸钠为pH值调整剂和分散剂,BY-9和P86为组合捕收剂,CMC为脉石抑制剂进行微细粒锡石正浮选。最终闭路试验得到锡精矿品位18.5%、回收率65%的指标。研究结果表明利用离心选矿机进行脱泥富集,采用重选—浮选联合工艺对微细粒锡石具有较好的选别效果。     

锡石多金属硫化矿精矿降砷的探讨

通过对毒砂矿物性质的分析、硫化矿降砷的探讨及锡石多金属硫化矿的试验得出锡石多金属硫化矿浮选降砷的有效抑制剂为TS-1新药剂。重选方法（摇床分选）用于硫精矿降砷有一定效果，除砷效率接近80％。     

Adsorption of sodium dodecyl sulphate on cassiterite surface

Measurements of the adsorption of sodium dodecyl sulphate (SDS) onto cassiterite were made. It was found that at SDS concentrations below 10 ^?3 mol/L the adsorption depended on the manner of preparation of the cassiterite and the pH of solution. However, the adsorption isotherms showed a point of inflection at l0 ^?3 mol/L corresponding to an occupied area per molecule of about 0.8 nm². This value is close to the surface area covered by one dodecyl sulphate ion (DS ^?) as evaluated from the molecular structure of SDS. Near the critical micelle concentration (cmc), a plateau was found which corresponded to the adsorption of two statistical monolayers of DS ^? ions vertically oriented to the surface.     

An experimental approach for smelting tin ores from Northwestern Iberia

ABSTRACT

In the present work microstructural and chemical analysis of tin and slag that resulted from three smelting experiments reconstructing prehistoric conditions are presented. Cassiterite ores were collected from northwestern (NW) Iberian deposits and were smelted in a small open pit. Results show that the loss in tin can be very high, up to 80%, mainly as a result of volatilization of Sn species. The experiments show that using handmade leather bag bellows and clay tuyeres, temperatures can easily reach >1200°C. The tin produced was a very pure (Sn) solid solution, with the presence of dispersed inclusions or phases of various composition. These included FeSn and FeSn₂ intermetallics and small metallic W inclusions. Slags could be grouped into three types based on their physical characteristics, and bulk chemical analysis could relate each type as being a product from the reaction of ore material or a product from the reaction with the crucible material. Generally, it was found that in spite of very low recovery rates, the tin produced by this simple technique would have been adequate for a domestic small-scale production.     

锡石多金属硫化矿降砷的探讨

通过对毒砂矿物性质的分析,探讨硫化矿降砷及锡石多金属硫化矿选别试验,得出锡石多金属硫化矿浮选降砷的有效抑制剂为TS-1新药剂。用云锡摇床处理硫精矿降砷效果好,除砷效率接近80%。