某高砷高硫微细粒多金属难处理金矿浮选试验研究

某多金属金矿石矿物组成复杂,金矿物嵌布粒度微细,属典型的高砷高硫微细粒难处理金矿石。依据矿石特性,确定采用优先浮选金、铅-金铅尾矿浮选锌及硫砷分离回收剩余金的工艺技术路线,并通过详细深入的试验研究,较好地解决了该高砷高硫微细粒复杂多金属难处理金矿石的选矿技术难题,获得了较理想的技术经济指标。该成果已被该多金属金矿500 t/d选矿厂设计采用。     

Column bioleaching of a polymetallic ore: Effects of pH and temperature on metal extraction and microbial community structure

A complex, polymetallic ore with approximately 6 wt% organic carbon and 3 wt% inorganic carbon (calcite) was bioleached using mixed cultures of mesophilic and moderately thermophilic microorganisms enriched from materials obtained from an auto-heating coal mine. The microorganisms adapted readily to the ore despite the organic carbon content. Two characteristics of the pyrite-rich ore, a porous organic-sericite phase that allowed the lixiviant and oxidant to penetrate particles and contact sulfide grains and a quartz-feldspar phase that partly occluded the acid-consuming carbonate phase, facilitated rapid and efficient metal (Co, Ni, Cu and Zn) extraction. Metal extractions showed little temperature or acid dependence. Extractions of Co, Ni, Cu and Zn in inoculated tests were higher than in uninoculated tests under the same conditions, indicating at least partial association of the metals with sulfide minerals and highlighting the roles of microorganisms in enhancing bioleaching. Approximately 40–60 wt% of the metals were acid soluble. The oxidation of pyrite with concomitant acid generation was a key parameter in lessening acid consumption during leaching. On the basis of solution monitoring data and leached residue analyses of the carbonate contents and sulfur speciation, it is concluded that leachate free acidity is also an important parameter in metal extraction. Both parameters relate directly to acid use in bioleaching systems and impact on the economics of proposed processes. The microbial communities in the inocula and bioleaching samples contained three archaeal and five bacterial species. The archaeal species detected were related to Ferroplasma (Fp.) acidiphilum, Thermogymnomonas (T.) acidicola and Metallosphaera (M.) hakonensis. The bacterial species detected were related to Leptospirillum (L.) ferriphilum, Acidithiobacillus (At.) thiooxidans, Ferrimicrobium (Fm.) acidiphilum, At. caldus and Acidimicrobium (Am.) ferrooxidans. The Ferrimicrobium acidiphilum-related species was the only species present in the 35 °C and possibly the 50 °C columns thought to be native to the ore.     

蒙自白牛厂V1号矿体多金属硫化矿选矿工艺研究

详细论述了蒙自白牛厂Ｖ１号矿体多金属硫化矿的处理方法和１２ｔ／ｄ连续扩大试验工艺，可做为该矿山开发利用论证的依据。供参考选用。     

广东省大蓆钼多金属矿区土壤地球化学特征及找矿方向

在广东省大蓆钼多金属矿区内,采用土壤地球化学测量,对工作区的十种元素的异常加以分析,确定了异常区;结合工作区的地质构造特征、控矿因素以及土壤地球化学特征,共圈定了异常四处,尤其是AP1、AP2极其显著的综合异常,为下一步找矿工作的开展提供了良好的依据。     

闽中梅仙铅锌钼多金属矿地质特征及成矿模式

闽中梅仙铅锌钼多金属矿是武夷山成矿带的重要组成部分。结合新近在矿区开展的地质工作,对梅仙矿区矿床矿体特征和矿石特征等进行了阐述。结果表明,铅锌矿体呈层状和似层状分布,矿石主要以块状、条带状和层纹状构造为主;钼矿体形态常受裂隙及岩体影响,矿石主要呈膜状构造、网脉状构造、脉状—细脉状构造和薄层状构造等。通过野外观察和实验室显微镜观察,综合前人研究成果,认为矿区铅锌钼多金属矿系块状硫化物矿床与斑岩成矿系统耦合叠加的产物,成矿作用时代大概可划分为三个阶段,即：1）初始火山喷流—同生沉积成矿阶段;2）区域变质及成矿作用阶段;3）岩浆热液叠加—改造成矿作用阶段,并据此建立了可能的成矿模式。所得成矿模式已得到近期勘探工作验证。     

Heterostructure PtNi supported by Pd nanosheets high-performance catalysts for multifunctional fuel cell

Platinum (Pt) based catalysts have multiphase structure, such as two-dimensional (2D) nanosheets structure, with a large specific surface area and high atomic utilization ratio, and a large contact area with carbon support, which promotes the combination of catalyst and support, and improves the activity of catalyst. However, there are still many difficulties in the synthesis of 2D polymetallic alloy nanosheet catalysts. Herein, we synthesized palladium nanosheets (Pd NSs) catalyst with smooth surface structure via solvothermal method, smooth surface structure palladium platinum nanosheets (PdPt NSs) and palladium platinum nickel island particle nanosheets (PdPtNi IPNSs) catalyst. Compared with commercial TKK-Pt/C, the prepared PdPtNi IPNSs catalyst has better catalytic performance for oxygen reduction reaction (ORR), ethanol oxidation reaction (EOR) and methanol oxidation reaction (MOR). This work provides a simple and feasible strategy for the synthesis of stable and efficient polymetallic 2D alloy nanostructured catalysts.     

安徽宣城马尾山铅锌银矿控矿因素与找矿方向

宣城马尾山铅锌银矿是长江中下游地区近年来新发现的、具有较高经济价值的矽卡岩型多金属硫化物矿床。根据矿床学的成矿理论,在分析矿床具体特征的基础上对该矿的成矿规律和控矿因素进行了研究,提出在该区寻找此类矿床的几点方向。     

影响深海多金属硫化物选冶的矿物学因素

某深海多金属硫化物中锌、铜、金、银的品位分别为20.44%、0.41%、6.89g/t和141g/t,有价元素含量高,综合利用价值大。通过矿物组成、重要矿物的嵌布特征、嵌布粒度及磨矿产品中解离特征的研究,对影响选冶回收的矿物学因素进行了系统的分析。研究表明:闪锌矿是含量最多的矿物,具有含铁量变化较大、铁含量普遍较低、嵌布粒度不均、与自然硫和黄铁矿密切共生的特点,通过选矿可以获得高品质的锌精矿。自然硫的粒度细、与闪锌矿和黄铁矿共生紧密,但其浮游性能好,对铜、锌的选别影响较大,可以考虑优先浮选自然硫,以减少其对后续分选的影响。金、银矿物主要为自然金、银金矿和辉银矿,嵌布粒度细,基本都在0.005mm以下,与黄铁矿、闪锌矿的共生关系密切,由于闪锌矿和黄铁矿含量高,难以直接通过浮选的方式获得高品位的金、银精矿。     

XRF法测定以Cu Pb Zn为主的多金属矿中的主次元素

研究以Cu、Pb、Zn为主的多金属矿中主量元素及矿化元素的分析方法。通过配制合适的混合标准,选择合适的熔融试剂、脱模剂、氧化剂,制定熔融程序;对仪器测定条件进行优化。讨论共存元素干扰、分析元素及背景测量时间、背景的校正,将基体校正前后的曲线RMS进行比对。而后根据优化的条件成功地绘制各分析元素的工作曲线,验证仪器精密度及方法精密度,测定样品中的待测元素含量,并与ICP-AES及经典化学法进行比对,结果良好。     

某含金多金属氧化矿非氰浸出试验

本文以云南某含金多金属氧化矿为研究对象,运用“细磨-浸出”工艺流程,采用低毒浸金剂“SD”对该金矿的可浸性进行了试验研究。综合试验获得指标良好的工艺指标,金银浸出率稳定,平均金浸出率为93.30%,银浸出率为56.12%。