云南某高硅铝土矿选矿试验研究

云南某高硅铝土矿中Al_2O_3品位为41.79%,SiO_2含量为32.26%,由于硅含量较高,使得铝硅分离困难。通过对浮选药剂制度的优化,提高浮选效率、降低选矿成本。确定以碳酸钠作为pH调整剂,水玻璃作为石英的抑制剂,六偏磷酸钠作为分散剂,YR-15作为Al_2O_3的组合捕收剂,采用"一粗三精二扫"的选别流程,最终获得精矿Al_2O_3,回收率75.40%;A/S为8.34,达到提高资源利用率的目的。     

矿浆浓度对金矿浮选速率影响的动力学研究

采用一阶浮选动力学模型对金矿石的浮选回收率进行了拟合,以研究矿浆浓度对不同粒径金矿浮选速率的影响。结果表明,浮选矿浆浓度与金的累积品位呈反比,而与金的累积回收率近乎呈正比,低浓度比高浓度矿浆更有利于金的高效富集,高浓度矿浆下更有利于金的回收。粗颗粒金比细粒级金更适应高浮选矿浆浓度体系,其浮选回收率及累积品位均更高。实际矿石试验验证了浮选动力学拟合结果,在50%的浮选矿浆浓度中,经闪速浮选协同常规浮选工艺,可以获得金品位50.0 g/t,回收率88.93%的金精矿,获得了比单一常规浮选更好的技术指标。     

高压辊磨对邦铺钼铜矿石选择性碎解作用及机制

对邦铺钼铜矿石进行高压辊磨(HPGR)和颚式破碎(JC),然后对两种产品进行磨矿—浮选试验,采用扫描电镜(SEM)研究矿石的高压辊粉碎特性,采用单体解离度分析仪(MLA)研究磨矿产品的解离特性,并从药剂用量等方面研究矿石的最佳磨矿细度和浮选工艺条件。结果表明:高压辊磨—球磨—浮选工艺适宜的磨矿细度为粒度小于0.074 mm的颗粒含量为65%,颚式破碎—球磨—浮选工艺适宜的磨矿细度为粒度小于0.074 mm的颗粒含量为75%;在适宜磨矿细度和药剂制度下,高压辊磨—球磨较颚式破碎—球磨浮选效果好,钼粗精矿钼品位提高0.83%,钼回收率提高1.05%;铜粗精矿铜品位提高0.23%,铜回收率提高2.66%;高压辊磨对邦铺钼铜矿石发生选择性粉碎现象。球磨对高压辊磨产品发生选择性解离现象,提出"矿石高压辊选择性粉碎—球磨选择性解离—浮选"技术方案。     

吉林某金矿选矿工艺对比实验研究

对吉林某金矿进行了重选、无毒浸出和浮选3种选矿工艺对比实验,研究了磨矿细度、药剂用量、矿浆浓度等因素对选矿效率的影响。结果表明,无毒浸出工艺回收率为76.13%,重选工艺基本无优先选别作用;采用浮选工艺,在磨矿细度为-0.074 mm含量为90.52%,捕收剂异戊基黄药与丁铵黑药的药剂用量均为60 g/t,矿浆浓度为45%,活化剂硫酸铜用量为400 g/t条件下,对金品位为3.31 g/t的原矿进行一粗一精二扫闭路实验,最终获得品位为42.34 g/t,回收率为86.76%的金精矿,回收效果最好。     

优化浮选条件提高铝电解废旧阴极浮选指标

以含碳36.1%的废旧阴极为研究对象,对影响浮选效果的磨矿粒度、矿浆浓度及浮选及转速进行了研究,获得了最佳浮选条件。最佳浮选条件为:磨矿粒度为-200目占90%,矿浆浓度为25%,浮选机转速为1700r/min。通过改善浮选条件,碳精矿品质得到了改善,其碳品位提高了5.40;电解质精矿品质得到了改善,其碳含量降低了0.26,电解质回收率提高了4.58。     

煤下铝土矿选择性分散脱钾的研究

采用沉降法对煤下铝土矿进行脱钾研究,考察了不同分散剂对煤下铝土矿的选择性分散脱钾的影响。结果表明:碳酸钠、六偏磷酸钠、硅酸钠三种分散剂对分散脱钾都有一定的分散效果,通过组合分散剂实验进一步证实了复合分散剂的优越性。组合药剂为:碳酸钠、六偏磷酸钠、硅酸钠用量为0.6g/L、0.1g/L、0.2g/L时矿浆具有较好的分散效果。通过多次精选分散脱钾,铝精矿的K2O含量由原来的0.99%降至0.48%。提高了煤下铝土矿综合利用率,为生产优质莫来石材料提供参考。     

登封高硅铝土矿脱硅选矿工艺研究

河南登封地区的铝土矿属高铝、高硅、低铝硅比型铝土矿,其工艺矿物学表明,矿石中各矿物嵌布关系复杂,嵌布粒度细,造成矿石的洗选困难。通过选矿试验,最终确定了重选和浮选相结合工艺流程,试验结果表明,在磨矿粒度-0.074mm占95%时,通过重选能够得到铝硅比8.12的合格精矿,对摇床的中矿和尾矿分别进行浮选试验,得到中矿浮选的药剂最佳用量为碳酸钠500g/t,皂化油酸500g/t,尾矿浮选的药剂用量为碳酸钠3000g/t,六偏磷酸钠60g/t,皂化油酸800g/t;通过全流程闭路试验,铝土矿铝硅比由3.28提高到7.66,精矿氧化铝回收率为61.13%,达到生产氧化铝工业用铝土矿三级标准。Si O2含量由原矿的16.76%降为8.67%,脱硅效果明显。     

铝土矿反浮选体系分散与凝聚理论

在铝土矿反浮选脱硅过程中,矿浆悬浮液的分散和凝聚状态对微细粒－水硬铝石的回收和精矿铝硅比有显著影响。要使各种硅酸盐矿物混合物达到有效的选择性分离,首先必需使矿浆悬浮液处于最佳分散状态,避免各种矿物细粒间的相互混杂和矿泥罩盖。针对高硅铝土矿反浮选脱硅过程,根据经典DLVO理论,从颗粒间的相互作用分析了微细粒－水硬铝石在各种含硅脉石矿物表面的粘附情况。结果表明：一水硬铝石与含硅脉石矿物颗粒间的范德化相互作用总是吸引;而它们间的静电相互作用在弱碱性条件下时为排斥,在弱酸性条件下时为吸引,一水硬铝石的夹带上浮较为严重,不利于铝土矿的反浮选。     

赞比亚某金矿选矿工艺试验研究

根据赞比亚某金矿的矿石特点,对其进行了单一浮选、尼尔森重选和摇床重选-浮选联合3种工艺对比试验,考察了磨矿细度、捕收剂和给矿量等因素对选矿效率的影响。结果表明,摇床重选-浮选联合工艺具有最佳回收效率。在磨矿细度为-0.074 mm占73.65%及优选药剂用量条件下,经过两次摇床重选,重选尾矿再经一粗两扫两精,中矿循序返回闭路流程,可得金品位为66.40 g/t、金回收率为90.52%的综合金精矿,可作为矿山选矿工艺技术依据。     

高铝高硅铝土矿分段浮选脱硅研究

随着易选铝土矿资源的不断耗竭,细粒嵌布的高硅难选铝土矿成为重要原料。本文针对云南典型高铝高硅铝土矿,其含Al2O360.85%,SiO220.80%,铝硅比2.92,采用阶段磨矿阶段浮选脱硅工艺,研究了磨矿细度、药剂种类、药剂用量等因素对降硅过程的影响。在粗磨细度为-0.074mm 70%时进行一段浮选脱硅,粗精矿再磨至-0.037mm 90%后进行二段浮选脱硅,最终闭路试验获得铝土矿精矿产率62.74%,Al2O3品位69.23%,含SiO210.32%,A/S为6.71,Al2O3回收率为71.79%的良好指标。本研究对我国高硅铝土矿资源的开发利用具有重要借鉴意义。     

离心分离技术在熟料溶出浆液分离过程中的应用研究

通过理论研究和试验测定的指标，探讨了离心分离技术在熟料浆液分离过程中应用的可行性，从而为进一步优化烧结法氧化铝生产工艺指标提供参考。     

Tube separation functionals

Separation functionals are computed for a class of manufactured object that include cylindrical and rectangular artifacts, bored tubes and parallel surfaces with variable diameter. The perfect forms applied in this analysis are spatial tubes generated from planar regular and convex polygons. The construction of the tube separation functional involves the computation of an “inner envelope” which is functionally dependent on several parameters. The inner envelope is a new construction which allows the visualization of the separation functional for a three-dimensional symmetrical artifact. Examples are used to illustrate the separation functionals associated with various manufactured artifacts.     

相似元素的深度分离

提出了一种分子设计和定向寻找分离试剂的新方法。以相似元素钨和钼的分离为例，根据WO4^2-和MoS4^2-的结构特征，从价键因素、亲水—疏水因素、几何因素等方面分析了它们与吸附剂的作用，成功选择了有色金属硫化物作为选择性吸附剂，实现钨和钼的高效分离，并进一步探讨了吸附剂的改性优化和其它类似元素的深度分离问题。     

Enhancement of pentlandite surface magnetism and implications for its separation from serpentine via magnetic separation

The magnetism of pentlandite surface was enhanced through the selective precipitation of micro-fine magnetite fractions on pentlandite surfaces. This was achieved through adjustment of slurry pH and addition of surfactants. The results showed that at pH 8.8 with the addition of 100 g/t sodium hexametaphosphate, 4.5 L/t oleic acid, and 4.5 L/t kerosene, significant amount of fine magnetite particles adhered to the pentlandite surface, while trace amount of coating was found on serpentine surfaces. Thus, the magnetism of pentlandite was enhanced and pentlandite was well separated from serpentine by magnetic separation under the magnetic field intensity of 200 kA/m. Scanning electron microscopy (SEM) and zeta potential measurement were performed to characterize changes of mineral surface properties. Calculations of the extended Derjaguin–Landau–Verwey–Ocerbeek (EDLVO) theory indicated that, in the presence of surfactants the total interaction energy between magnetite and pentlandite became stronger than that between magnetite and serpentine. This enabled the selective adhesion of magnetite particles to pentlandite surfaces, thereby enhancing its magnetism.     

Some peculiar features of electric separation

The most characteristic features of the processes of electrical filtration of ideal and low-conducting dielectric fluids are considered. It is noted that, in liquid dielectrics in highly inhomogeneous electric fields, phenomena similar to those at corona discharge in gases with all its consequences are observed. The processes of electrical purification (separation) are interpreted in terms of a corona discharge. In particular, the electric charging of dispersed particles and their transport to the “electrode-collector” are considered. The threshold phenomena at electric separation such as the appearance and disappearance of the separation effect are treated from the standpoint of a corona discharge as well. Two concepts, namely, the screening of an external electric field by the field’s spatial electric charge and the ohmic resistance of the layer of dispersed particles deposited on the collector are discussed. Both approaches lead to identical results. To clarify the above-mentioned theoretical concepts and to work out recommendations for the modernization and efficient use of electrical separation, further studies of the experimental time-current characteristics of the process of the separation are needed.     

赤泥分离中的絮凝剂

本文综述了絮凝剂吸附、絮凝的机理 ,对各种絮凝剂的行为、影响絮凝沉降的主要因素及添加工艺进行了分析比较     

西峡红柱石矿石的浮选分离

研究应用不同捕收剂时红柱石的浮选行为。采用西峡红柱石纯矿物进行微型浮选试验,利用红柱石矿石进行小型浮选试验,测定纯红柱石表面的电荷。结果表明,红柱石的等电点为pH5.2。在pH值高于等电点时,矿物表面带负电荷,可用胺类捕收剂浮选红柱石。相反,红柱石表面带正电荷,用烷基磺酸盐捕收剂（十二烷基苯磺酸钠）浮选红柱石比较有效。在中性和弱碱性pH范围时用油酸盐可以浮选红柱石。用烷基磺酸盐捕收剂时可以获得含55.3%Al2O3,红柱石回收率为75.6%的红柱石精矿。在用烷基磺酸盐捕收剂时,淀粉是脉石矿物的有效抑制剂。此外,试验发现矿泥对红柱石浮选有不利影响。因此,浮选前必须脱碳和脱泥。     

Nickel-cobalt separation at Sherritt Gordon

Treating a complex nickel-copper-cobalt sulfide concentrate in a leaching operation has required the development of special techniques for the separation of nickel and cobalt. The process described in this paper can be applied with only minor modifications to a wide range of nickel and cobalt bearing solutions.