低品位重晶石的浮选特性研究

重晶石的用途非常广泛,对BaSO_4的含量要求85％～90％以上。但我国重晶石矿山贫矿多,富矿少,需进行选矿。因此,本文进行了低品位重晶石的浮选特性研究。结果确定了低品位重晶石浮选的最佳条件,并获得了品位98.2％,回收率82.3％的能生产高品位钡化合物的重晶石精矿,为今后重晶石选矿发展具有实用价值。     

Characterization of Glass Beads Surface Modified with Ionic Surfactants

Knowledge of the wetting characteristic of mineral surfaces is very important in enhancing the efficiency of separation of valuable minerals from gangue using froth flotation or oil agglomeration. In this paper a capillary rise technique was used to characterize the glass beads surface modified with cationic surfactant. The glass microspheres were used as model particles with a spherical shape and smooth surface to eliminate the roughness effect. The value of the contact angle for water was found to be 21.5 for unmodified beads, and 61.8, 89.7, 68.4 for 0.1, 1.0, 10 mg/g_solid of CTAB, and 39.8, 68.6, 87.9 for 0.1, 1.0, 10 mg/g_solid of DDAHCl, respectively. Data revealed that the adsorption of surfactant onto glass beads decreased the value of the electron donor component, γ-, which defines the hydrophobicity of the surface. Also, the property of the surface was investigated by flotation and oil agglomeration experiments. It was observed that particles with low value of contact angle for water and high for 1-bromonaphthalene and low value of γ- were floated with a recovery equal to 91.1 and 83.1% for CTAB and DDAHCl, respectively, and effectively agglomerated. This indicates that the capillary rise method can be successfully used to predict the wetting properties of solid particles in mineral processing.     

XJX-T16型浮选机改造实践

针对回坡底煤矿选煤厂浮选系统存在的浮选机尾矿灰分低、药剂耗量大、中粗粒级煤泥处理能力差、液面不稳定、吸浆能力易受影响等问题,说明XJX-T16型浮选机的双偏摆式斜叶轮、中心套筒入料方式及槽体内部距离套筒半径300 mm区域内的"充气死区"是造成上述问题的主要原因。在借鉴XJM-S系列浮选机结构特点的基础上,通过在浮选机头槽增设入料箱,设计新的XJM-S型搅拌机构和假底稳流板,在浮选机槽壁之间加焊浸没式中矿箱,减小搅拌电机功率为37 kW以及设计新的小带轮直径等措施对XJX-T16型浮选机进行了改造。改造后的浮选机不仅对入料中的粗煤泥起到了一定的回收作用,还提高了入料中高灰细泥(极细粒级)的浮选选择性,降低了浮选系统能耗,提高了选煤厂经济效益,每年可增加效益350万元;2台浮选机共降低功率80 kW,每年可节约电费25万元,节约更换电机费用约12万元。     

高灰细泥对煤泥水处理系统的影响

分析了升平煤矿选煤厂煤泥粒度组成,发现浮选入料中高灰细泥含量高,增加了煤泥脱水的难度。在论述颗粒直径与浮选特性、药剂消耗关系的基础上,对选煤厂浮选精煤粒度组成进行了分析,说明细粒煤对浮选精煤污染严重。浮选入料细粒煤泥过多造成了选煤厂滤饼水分、滤液浓度高,煤泥水性质恶化,过滤机吸料差,处理能力低,并针对上述问题,将原有PG78-8圆盘真空过滤机更换为GPJ-96加压过滤机对选煤厂进行了改造。改造完成后,GPJ-96加压过滤机的入料质量分数和滤液质量分数均低于PG78-8圆盘真空过滤机,且滤饼质量分数远大于PG78-8圆盘真空过滤机,可见GPJ-96加压过滤机煤泥压滤效果较好;GPJ-96加压过滤机的固体产率由原来的61.53%增加到67.06%,脱水率由原来的92.34%增加到94.86%,降低了循环水浓度,有利于生产的稳定进行。     

气相色谱法测定磷矿石浮选环境水体中苯酚

介绍利用气相色谱法测定磷矿石浮选环境水体中苯酚的实验方法;通过实验确定最佳测定参数。测定指标达到HJ503-2009和相关标准,为控制磷矿浮选循环水品质提供依据。该方法简单,成本低,结果准确。     

硫化矿捕收剂的研究进展

综述了硫化矿捕收剂的合成及浮选应用,混合捕收剂与组合用药的应用现状,捕收剂在硫化矿表面的作用机理。研究捕收剂分子结构和它们与矿物表面的作用机理,为硫化矿物新药剂的分子设计、开发与应用提供了理论指导。     

黄磷粉矿的利用与成球技术

由于黄磷生产用矿的品位逐年下降,原来不用的黄磷粉矿和中低品位浮选精矿通过成球技术已用于黄磷生产。介绍我国黄磷企业利用黄磷粉矿和浮选精矿成球的工艺技术,评述各种成球工艺的投资、成本和球团效果。     

盐酸直接分解磷矿浮选尾矿的实验研究

为了利用副产盐酸和回收利用浮选尾矿中的磷,用盐酸直接分解磷矿浮选尾矿进行了实验研究。利用正交设计,研究了盐酸质量分数、盐酸用量、反应温度和反应时间对尾矿中磷溶出率的影响;介绍所得磷酸酸解液用氨水中和制取NP肥的情况;最后为降低能耗、物耗讨论了盐酸分解尾矿应采取的适宜工艺条件。     

云南晋宁磷矿浮选废水处理研究

在磷矿的正反浮选中,由于矿浆不同的pH值条件,磷矿石的多样性,矿浆中无机离子及药剂组份表现出不同的特性,正浮选尾矿水、反浮选精矿水及反浮选尾矿水差异性很大,将所有选矿废水集中收集,不经处理统一回用显然是行不通的。絮凝沉淀法是处理晋宁磷矿浮选废水的有效方法之一,石灰与碳酸钠或磷酸钠配合使用都可以用来处理浮选废水。当氧化钙用量为4.0 kg/m3、碳酸钠用量为0.6 kg/m3时,闭路流程试验最终精矿w(P2O5)=29.66%,回收率达77.38%;当氧化钙用量为2.0 kg/m3、十二水磷酸钠用量为0.2 kg/m3时,最终精矿w(P2O5)=30.22%,回收率76.74%。此方法处理后的废水回用对浮选过程影响不大,且简单易行,工业上容易实施。     

The Effects of Various Flotation Parameters on Gold Recovery by Coal-Oil Assisted Gold Flotation

The effects of different physical parameters such as pulp density, aeration conditions, and impeller speed on the performance of coal-oil assisted gold flotation were investigated in this study. The experiments were conducted using samples taken from an epithermal gold ore deposit. The results demonstrated that increasing the solid concentration in feed pulp slightly improves recovery of gold particles, but accompanied by significant decreases in concentrate grade. At low aeration conditions gold recovery was relatively low whereas at high aeration conditions the selectivity was poor. The use of higher level of agitation in the agglomerate re-formation stage brought about an increase in gold recovery; however, gold grade of the concentrates tended to decline. Gold grade of the concentrate was significantly increased by reloading of the coal oil agglomerates; on the other hand, substantial decreases were observed in total gold recovery after each successive cycle.