某铜矿重介质产品提铁降硫选矿试验

某铜矿重介质产品铁品位56.24%，硫含量高达9.34%，95.72%的硫以磁黄铁矿的形式存在。为获得硫含量<2%的铁精矿，按磨矿—弱磁选—浮选原则流程对该矿石进行了选矿试验。试验结果表明，在最佳试验参数下，重介质产品经一段磨矿（-0.043 mm 85%）—1粗1精弱磁选—1粗2扫脱硫浮选流程处理，可获得产率45.23%、硫含量为1.52%、全铁品位66.50%的铁精矿，可作为后续钢铁冶炼原料的配矿使用，为此类重介质产品的利用提供技术参考。     

P204树脂和阳离子交换树脂分离Sc与裂变产物

P204对Sc有很好的分离选择性和分离能力，但由于反萃困难限制了其在Sc纯化中的应用。本工作研究了从裂变产物中分离纯化Sc的方法，建立流程如下：首先利用P204树脂对Sc的强萃取能力，将Sc与大量裂变产物分离，再通过灰化方法破坏树脂官能团，解决了吸附在P204树脂上的Sc难以解吸的问题，最后通过阳离子交换树脂实现Sc与残留Zr和Mo的分离，从而实现了Sc与裂变产物的分离。该方法对样品体积和酸度要求低，流程步骤操作简单。通过对模拟样品进行分析，Sc的回收率大于65%，对主要裂变产物的去污因子大于10³，适用于Sc与裂变产物的分离。     

应用独立分量分析的激光测风雷达湍流频谱分解

针对大型风力发电机机组中常见的脉动湍流、风机尾流与涡流等湍流信号,研究了利用自然梯度下降的独立分量分析方法的湍流频谱分离效果,以区分中心风速与湍流信号,提高风机机组的综合工作效率。首先分析了风机组中常见湍流信号的后向散射与频谱分布特点,然后依据这些特点设计了对应的独立分量分析模型。在仿真结果符合要求的基础上,进行了双目激光雷达天线的风速采集与实际分离效果检测。实验结果表明,在大气折射率结构常数C2n≤10-14同时广义大气常数α≥4的通常情况下,利用双目信号能够分离出一个湍流中心和一个中心风速。对1 s内两个谱峰的波动范围进行统计,获得(2.59±0.05)MHz的中心风速以及(1.22±0.19)MHz的湍流中心估计,且二者的平均信噪比分别为25.93 dB和31.01 dB,能够在获得稳定的中心风速估计的同时得到一个较为稳定的湍流中心估计。     

Influence of salt concentration on solubility and tie-line data for the system: Formic acid + n-butanol + water

The tie-line and solubility data, i.e. formic acid (FA) + n-butanol + water + NaCl, were resolved at T = 298.15 K and under ambient pressure. The Othmer–Tobias equation was applied in this study. The experimental data were correlated and all linear correlation coefficients were found to be approximately equal to 1. Both the Universal Quasi-chemical Theory (UNIQUAC) and Nonrandom Two Liquid Theory (NRTL) and NRTL models were employed in order to compare the experimental liquid–liquid equilibrium (LLE) and tie-line data. Consequently, the calculated and experimental data proved to be a good fit. Results show that adding salt to the system proved beneficial by increasing the separation of FA from water.     

某含锌锡多金属硫化矿石锌浮选试验研究

某含锌锡多金属硫化矿石Zn、Sn、Fe、S含量分别为6.04%、1.05%、29.33%、19.08%，锌主要以铁闪锌矿、闪锌矿的形式存在，锡主要以锡石的形式存在，铁主要以黄铁矿、磁黄铁矿等形式存在，其中的金属矿物共生关系密切，相互包裹现象普遍。为确保不影响后续选锡，对锌浮选流程进行了试验研究。结果表明：矿石在磨矿细度为-0.074 mm占80%的情况下，采用预先脱硫—锌硫混浮再分离流程处理，在选择硫酸铜为锌矿物活化剂、丁基黄药为捕收剂、松醇油为起泡剂、石灰为黄铁矿抑制剂的情况下，经1段脱硫、2粗1扫锌硫混浮、1粗2精锌硫分离，锌硫分离精选尾矿与锌硫混浮扫选精矿2次精选后锌硫分离，最终获得锌精矿Zn品位47.06%、回收率90.76%，试验指标良好。     

广东某复杂铜铅锌矿浮选试验研究

广东某复杂铜铅锌矿石中的矿物嵌布粒度较细且相互包裹，导致现场铜、铅、锌浮选分离困难，为解决此问题进行了选矿试验研究。结果表明：在选铜时，选用FK 1与DS组合抑制铅锌，可有效解决精矿的互含问题；在高碱工艺下，采用先铜后锌的优先浮选工艺，铜铅粗泡再磨后经2次精选，能获得铜品位为2110%、回收率为8088%的铜精矿，铅锌总含量为1023%，达到铜精矿四级品要求；采用1粗2精2扫流程处理选铜尾矿，获得了锌品位为5217%、回收率为9278%的锌精矿。试验所用药剂全部为常规药剂，试验流程结构简单，现场实施比较容易，可作为现场改造的依据。     

Chromatographic characterisation of aptamer-modified poly(EDMA-co-GMA) monolithic disk format for protein binding and separation

The introduction of aptameric ligands onto disk-monolithic adsorbent, representing a unique strategy for convective isolation of target molecules with high specificity and selectivity, is investigated for the first time. Experimental results showed that the disk monolith possessed a good permeability of 1.67 ± 0.05 × 10^–14 m² (RSD = 3.2%). The aptameric ligand density for the aptamer-modified disk monolith was 480 pmol/uL. Chromatographic analysis of the aptamer disk-monolith efficiency showed an optimum linear velocity of 126 cm/min (≈0.25 mL/min) at room temperatures 25 ± 2°C. The theoretical number of plates corresponding to the optimum linear velocity was 128.2 with an height equivalent to the theoretical plate of 0.022 mm. The disk aptamer-immobilised monolithic system demonstrated good selectivity and isolation of thrombin from non-targets.     

临涣选煤厂粗煤泥回收工艺优化的实践应用

临涣选煤厂针对洗选过程中存在的精煤泥旋流器组溢流跑粗、精煤泥弧形筛筛下水跑粗、精煤泥弧形筛脱水效果较差等问题，重点开展精煤泥分级旋流器组入料分配不均匀、筛分错配物影响、弧形筛脱水效果的现场攻关和研究。现场大量试验表明:通过停止精煤泥旋流器组，增加精煤泥弧形筛数量、减小筛缝尺寸，改变精煤泥弧形筛击打，改用高频脱水筛等方式，从源头上解决了精煤泥分级旋流器组跑粗，明显改善了精煤泥弧形筛筛下水跑粗的问题，提高了精煤泥弧形筛分选效果。在降低介泥灰分、减少浮选过程中粗颗粒的含量、缓解浮选回收压力、降低降低浮选油耗、提高浮选精煤灰分、保证精煤产率、节约生产成本方面有实践意义。     

Fabrication of BSCF-based mixed oxide ionic-electronic conducting multi-layered membrane by sequential electrophoretic deposition process

The Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ (BSCF)-based multi-layered oxygen separation membrane was fabricated by the sequential electrophoretic deposition (EPD) process. A thin porous/dense bi-layer of BSCF was formed on a thick porous support of BSCF. The porous support prepared by a sacrificial template method using BSCF powder mixed with wheat starch (30 wt%) as a pore-forming agent, followed by uniaxial pressing and low-temperature sintering, was directly used as an EPD electrode. A thin BSCF layer was first formed on the porous support, and then a thin BSCF + PMMA (polymethyl methacrylate) layer was sequentially formed on the thin BSCF layer using a bimodal suspension of BSCF and PMMA. A 30-μm thin porous/dense bi-layer of BSCF of which the total thickness was obtained by optimizing the processes of EPD and subsequent co-sintering. The oxygen separation performance of 3.7 ml (STP) min^?1 cm^?2 at 860 °C was achieved for the BSCF-based multi-layered oxygen separation membrane.     

Constructing magnetically recoverable CdS/CaFe2O4 P–N heterojunctions for enhanced photoelectrochemical properties towards H2 evolution reaction

A novel CdS/CaFe₂O₄ (CS/CFO) heterogeneous p-n junction was created by thermal deposition of CaFe₂O₄ nanoparticles on CdS rods. The CS/CFO hetero-structured photocatalysts exhibited increasingly efficient visible light harvesting compared to the bare CdS. The CS/CFO composites also presented higher photocurrent and slower decay of photoluminescence, suggesting a better separation of the photo-generated electrons and holes. The photocatalytic H₂ evolution quantity on the optimized CS/CFO composite from water in the presence of ethanol was up to 2200 μmol after 3-h visible light illumination, which is more than twice that of the pristine CdS. The chemical interaction between CdS and CaFe₂O₄ was confirmed by the shifts in the XPS peaks, which made it possible for the charge carriers to transfer across the p-n junction interface. This research highlights the importance of forming an interfacial p-n heterojunction between two semiconductors for efficient charge separation and improved photocatalytic performance.