采用酯类捕收剂PZA提高铜、银回收率的选矿试验研究

在某硫化铜矿浮选过程中,进行了酯类捕收剂PZA与丁基黄药、丁基铵黑药、Z200等对比研究,发现PZA对铜、银具有良好的选择性,与丁基黄药组合效果更佳。原矿铜、银品位分别为0.28%和8.50g/t情况下,采用铜硫混合浮选—铜硫分离工艺流程,最终获得了铜精矿Cu品位21.58%、回收率83.94%,Ag品位500.10g/t、回收率62.99%的技术指标,较好的实现了银在铜精矿的定向富集。     

Contagious agalactia monitoring in caprine herds through regular bulk tank milk sampling

Surveillance and control of Mycoplasma spp. responsible for contagious agalactia (CA) in caprine herds are important challenges in countries with a large small-ruminant dairy industry. In the absence of any clinical signs, being able to determine the potential circulation of mycoplasmas within a herd could help to prevent biosecurity issues during animal exchanges between farms and improve health management practices. The objective of this study was to determine whether regular sampling of bulk tank milk was suitable for such surveillance. Twenty farms were sampled once a month for 2 yr and CA-responsible mycoplasmas were detected by real-time PCR on DNA extracted from milk, using 3 different DNA extraction methods. The pattern of mycoplasma excretion in bulk tank milk was assessed over time and several herd characteristics were recorded together with any event occurring within the herds. In general, the results obtained with the different detection methods were comparable and mainly agreed with the culture results. Several patterns of excretion were observed but were not related to herd characteristics (size, breed, and so on). Recurrence of the same (sub)species and same pulsed-field gel electrophoresis subtype during the 2-yr period is indicative of the considerable persistence of mycoplasmas. This persistence was associated with intermittent excretion. In conclusion, bulk tank milk sampling could be valuable for controlling CA in caprine herds provided it is repeated several times, yet to be defined, per year and analyzed using an appropriate methodology and the right cut-off for interpretation.     

贵州某高硫铝土矿浮选脱硫试验研究

对贵州某高硫铝土矿进行了浮选脱硫试验研究。结果表明, 在磨矿细度-0.074 mm粒级占82.64%, 碳酸钠用量1 800 g/t、硫酸铜用量150 g/t、丁黄药总用量600 g/t、2^#油总用量240 g/t条件下, 经一粗两精两扫闭路反浮选, 获得了硫含量0.26%的铝土矿精矿, 脱硫率达到85.86%。试验结果可为该类铝土矿资源的综合开发利用提供借鉴。     

基于多颜色分量CLBP提取的浮选泡沫状态识别

针对不同状态的浮选泡沫图像之间纹理结构相似、颜色差异不明显的问题，提出一种基于色调、饱和度和亮度（HSV）颜色空间的完全局部二进制模式（CLBP）纹理提取的浮选泡沫状态识别方法。首先使用双域去噪在保留纹理细节的同时滤除图像噪声，然后转换为HSV图像，在H、S和V颜色分量上分别提取三个尺度的CLBP纹理特征。将提取的纹理特征归一化后线性排列，建立高维度的纹理分类模型。最后通过一对一模式的支持向量机分类器对四类泡沫状态的样本集进行纹理提取后的分类训练与测试。结果表明，该方法对不同浮选泡沫状态的分类正确率较高，优于其他纹理描述方法，适用于浮选泡沫状态的识别。     

甘肃某低品位铅锌银矿浮选试验研究

甘肃某极低品位氧化铅锌银矿,铅品位0.96%、铅氧化率37.50%,锌品位0.76%、锌氧化率32.88%,银品位207.66g/t,银主要以银锑黝铜矿的形式存在并与方铅矿共生。根据该矿的性质,优先浮选产出铅精矿,混合浮选产出铅锌精矿,并将银富集到铅精矿和铅锌精矿中。采用新型捕收剂GH,通过闭路选铅,获得了铅品位55.71%、铅回收率20.73%,银品位7 476.81g/t、银回收率14.39%的铅精矿;在闭路混选中,获得了铅品位17.61%、铅回收率37.47%,锌品位23.64%、锌回收率65.67%,银品位5 593.42g/t、银回收率59.49%的铅锌精矿。富集伴生银矿物的同时,实现了对低品位矿物的高效回收。     

Flotation and adsorption of a new collector α-Bromodecanoic acid on quartz surface

A new type collector α-Bromodecanoic acid (CH₃(CH₂)₇CHBrCOOH, α-BDA) was synthesized by solvent-free method (Hell–Volhard–Zelinski reaction) in laboratory for the flotation of quartz mineral at a relatively low temperature of 16 °C. The adsorption mechanism of α-BDA collector on quartz mineral surface was established by zeta potential measurements, contact angle measurements, Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS), in conjunction with the results of quartz micro-flotation tests. The flotation results showed that the activator Ca(II) functioned as an indispensable and crucial factor on the recovery of pure quartz. When the quartz was floated with α-BDA alone at strong alkaline conditions (pH ⩾ 11.50), the recovery rate reached to only 11.9%. However, when using the activator Ca(II) at a concentration of 4 × 10⁻⁴ mol/L, the collector exhibited an excellent performance, where about 99.5% of the quartz had been floated at or above pH value 11.50 at 16 °C. The study revealed that the α-BDA collector had adsorbed on the surface of pure quartz in the forms of electrostatic interaction, hydrogen bonding and chemical adsorption based on the results of zeta potential measurements, contact angle measurements, FT-IR spectra, and XPS.     

有机抑制剂在黄铁矿浮选中的研究进展

作者简介:梁爽(1987-),女,工程师,硕士研究生,102600 北京市大兴区北兴路东段22号。     

泥质化蚀变型锂辉石矿选别工艺研究

锂辉石矿发生蚀变以后，选别处理过程中存在泥化严重、可浮性差的难题。采用传统的闭路浮选流程处理Li2O品位为1.05%的此类矿石，难以获得较为理想的指标，锂精矿Li2O品位仅为3.12%，Li2O回收率为43.61%。为此，本文介绍一种全开路锂辉石矿选别工艺，通过改变中矿走向，获得Li2O品位3.83%，Li2O回收率48.19%的锂精矿。之后锂精矿经反浮选除杂，最终Li2O品位可以达到4.58%。     

在线X射线荧光分析仪建模及模型校正方法的研究

BOXA型载流X荧光品位分析仪采用X射线荧光技术对选矿流程中矿浆内金属元素品位值做在线实时检测。目前常用最小二乘法进行线性拟合建模,但是此方法在各个通道存在线性相关性时会失效,同时BOXA分析仪配置波长+能量双通道,当测量通道发生故障或者测量通道升级更换之后,原模型不再适用,重新标定时间过长。本文提出使用Bisquare建模的方法,模型精度以及对异常点的敏感性均优于最小二乘法,同时提出一种模型校正的方法,可以将模型校正到与原模型相近的精度,可以大大的节约时间,尽快恢复使用。通过原矿和锌尾矿进行实验验证,结果表明校正模型的精度与原模型基本相当,对指导选矿厂工艺流程有着重要的作用。