××碳酸盐型萤石矿选矿试验研究

通过对浙江××碳酸盐型萤石矿的条件试验及开路、闭路流程试验研究,在常温条件下,采用一次粗选六次精选、部分中矿集中再选、抛两个尾矿的选矿工艺流程,取得了较好的选矿指标.     

降低磷块岩反浮选中磷酸用量的试验研究

<正> 在磷矿选别中,磷块岩选矿工艺是选矿工作者致力研究的一个重要课题。近年来,笔者在对磷块岩选矿试验研究中,通过反浮、正-反浮、反-正浮以及重介质选矿等不同工艺流程和方法的分析对比,使磷块岩选别有了新的进展。通过反浮选处理湖北保康磷矿取得了较好的工艺指标,但采用磷酸作为抑制剂成本较高。为降低反浮选成本,用硫酸替代部分磷酸,采用一次粗选,二次精选开路流程,取得了较好效果(表1)。     

河北某斑岩型钼矿提高选矿指标试验研究

河北省某钼矿为单一斑岩型钼矿,主要金属矿物为辉钼矿。为了进一步提高钼精矿的品位和回收率,试验采用混合捕收剂(煤油∶2号油=2∶1)和新型捕收剂PE-100相结合的方法,粗选时可使粗精矿的回收率提高2个百分点,品位也略有提高。为节约生产成本,试验采用阶段磨矿阶段选别的选矿工艺,即原矿磨矿(-0.074mm占60%)后,经一次粗选,一次扫选,粗精矿再磨(-0.038mm占85%)后再进行5次精选,最终获得钼精矿品位w(Mo)=50.007%,回收率为89.90%的较好指标。     

成功之路——辽宁地质六队大连滨海金刚石公司介绍

大连滨海金刚石公司(见封底照片)是辽宁省地矿局第六地质大队的队属企业,建于1980年8月,经过8年的发展,逐步实现了金刚石采矿、选矿、加工、销售一条龙经营.公司拥有采矿场、选矿场、工具加工厂、宝石厂.年生产规模为:金刚石1万克     

我国金伯利岩含金性试验研究--以辽宁瓦房店50号岩管为例

一般认为原生或伴生金矿床在成因上与中酸性火成岩有关.文章通过我国金伯利岩型金刚石矿床伴生金的试验研究,确定该类型伴生金矿与超基性火成岩有关.金伯利岩中个别样品w(Au)=0.46×10-6,金刚石选矿尾矿及其重选精矿金的质量分数均较高,具有一定的学术研究价值和开发利用前景.     

从铅尾矿中回收载银方铅矿的试验研究

采用化学多元素分析、XRD和SEM-EDS等技术对尾矿的矿物组成和微观结构进行表征,研究表明:该尾矿中主要的有价元素为铅、银,含量分别为0.67%、16.51 g/t,银主要呈细粒状或者类质同相赋存于方铅矿中,载银方铅矿为主要回收对象。在此基础上,对尾矿中载银方铅矿的回收进行了选矿工艺流程和药剂制度的研究;讨论了磨矿细度,捕收剂种类、用量,精选矿浆p H值等因素对浮选工艺的影响,确定了磨矿细度为-0.074 mm占80%,丁基黄药作为捕收剂,用量为80 g/t,石灰作为精选调整剂,矿浆p H=11.0的药剂制度。通过"一次粗选、二次扫选、三次精选"的浮选工艺流程,获得了铅、银品位分别为6.41%、147.09 g/t,回收率分别为63.38%、58.59%的精矿,实现了铅锌尾矿中铅、银的有效回收利用。     

四川某稀土矿尾矿中回收萤石的试验研究

四川某稀土尾矿中CaF2品位为24.67%,属于中低品位伴生萤石矿资源,具有一定的经济回收价值。根据该尾矿中主要脉石矿物组成及嵌布特性,经选矿试验研究,获取最佳萤石回收工艺流程。结果表明,在一段磨矿细度-0.074mm占60.16%条件下,采用调整剂碳酸钠、抑制剂酸化水玻璃、捕收剂OZ,经“1次粗选、2次粗精选、1次扫选”的试验流程得到萤石粗精矿;萤石粗精矿在二段磨矿细度-0.074 mm占79.26%条件下,采用抑制剂WS,捕收剂油酸,经“1次精粗选、7次精选、2次扫选”的闭路试验流程,最终获得含CaF2含量97.43%、回收率50.72%的萤石精矿1,CaF2含量93.25%、回收率25.97%的萤石精矿2,萤石总回收率76.69%,实现了对该稀土矿尾矿中萤石的回收。     

金属粉料氧化对热压孕镶金刚石钻头性能的影响

通过热压孕镶人造金刚石钻头的生产实践,逐步认识到作为胎体材料的金属粉料的氧化对钻头性能有严重影响.因此,研究金属粉料的氧化影响.退火还原工艺、防氧化措施等对提高钻头的质量甚为重要.一热压孕镶金刚石钻头对胎体性能的要求及影响胎体性能的主要因素热压钻头的烧结属于有液相存在的热压烧结过程.所用材料为多种金属粉末,分别作为骨架成分和粘结成分,经热压烧结成胎体,用来破碎岩石的金刚石为胎体所包镶.所以胎体的性能是决定钻头质量的主要因素     

地质勘探金刚石岩心钻探中浅孔主体口径探讨

针对地质勘探金刚石岩心钻探采用的钻孔口径进行分析,从采心质量满足研究和评价地质矿产的要求、钻探技术经济效益、钻探方法可行性角度,提出在地质勘探金刚石岩心钻探施工中浅孔时主体孔段口径应采用B规格。     

内蒙古阿右旗低品位镍矿石可选性试验研究

该试验对低品位镍矿进行了选矿试验研究。结果表明：采用一段磨矿、细度-0．074mm 85％、先反浮选脱泥、脱泥后的尾矿进行粗选,两次粗扫选、三次精选流程;浮选药剂采用碳酸钠、2^#油、CMC、硫酸铜、丁基黄药、J-622;试验指标为：原矿镍品位0．18％、浮选精矿镍品位3．15％、浮选尾矿品位0．11％、反浮选产品镍品位0．19％、精矿镍回收率39．17％。该研究结果为该矿石的可选性评价提供了技术依据。     

电镀金刚石钻头镀前超声清洗机理及工艺研究

电镀金刚石钻头镀前清洗是钻头生产的关键制造工艺.超声清洗作为一种精清洗技术,在不少领域获得了成功.本文阐述了超声波对金刚石钻头镀前清洗工艺的适应性,分析了电镀金刚石钻头中的主要清洗对象及超声清洗机理,对超声清洗中的各项工艺参数及工艺流程进行了研究,说明了超声清洗的经济适用性及可操作性.     

铀矿选矿及其在铀水冶中的作用

本文研究了我国各类型铀矿床矿石的可选性及适宜的选矿方法;对不同的矿石用不同选矿或选矿-水冶联合流程,可有效地提高水冶供矿品位和回收伴生元素,降低水冶成本。最后,作者就如何提高矿床经济效益提出了结论和建议。     

热压铁基孕镶金刚石钻头的试验研究

针对在坚硬致密岩石中钻进时效低和钻头使用寿命短的技术难题,分析了热压钻头的金刚石出刃与岩石研磨性等岩性之间的内在联系,认为钻头的胎体成分及其性能是关键,硬而带脆性的胎体性能有利于金刚石出刃,从而能提高钻进速度。因此,从热压金刚石钻头的胎体成分与性能研究入手,经过反复的试验研究,试制出了热压铁基孕镶金刚石钻头,取得了突破性的进展。在坚硬致密岩层中钻进,钻进时效由0.5 m左右提高到1.17 m,钻头寿命由10 m左右提高到21.31 m,解决了在坚硬致密岩层中钻进难的问题。试验研究结果说明,铁基合金是一种新型的金刚石钻头胎体材料,热压铁基孕镶人造金刚石钻头是一种新类型的金刚石钻头。     

Beneficiation of phosphatic ores through flotation: Review of industrial applications and potential developments

Beneficiation of phosphatic ores through flotation is the general rule for apatitic endogenic ores (Kola, Phalaborwa, Brazil). It also constitutes the most widely used concentration process of sedimentary deposits with a siliceous gangue (Florida, Senegal). On the other hand, sedimentary deposits with a carbonate-bonded phase are not yet subject to industrial exploitation and the various flotation methods are still at the laboratory or pilot experimental stage. Abundant research is being carried out today and one or several methods should be sooner or later applied on a large scale.In the present day, plants make use of direct flotation (generally a fatty acid collector) sometimes followed by reverse flotation of siliceous fines carried away in the froth formed at the first stage. A careful removal of the clays is the rule.The beneficiation of sedimentary ores with carbonate gangue, on the contrary, will be done through reverse flotation of penalising elements.     

The Principle of the Drilling by Impregnated Diamond Bits and the Classification of Rocks

Recently impregnated diamond bits have been widely applied in drilling hard and me-dium-hard formations in the world.It is quite necessary to study the fracturing mecha-nism of the impregnated diamond bit and the classification of rocks,which can realizeoptimum drilling.Using multi-parameter rotary test stand can monitor and print nineparameters.The diamond size and concentration for experiment are various and there arenearly200 types of samples,numbering over1000 pieces.The results of laboratory arethe same as those in the field.Besides,this paper expresses that the diamond concentra-tion of impregnated diamond bits effect the bonding strength of diamond imbedded in ma-trix.During drilling by impregnated diamond bits three ways are used to cool the bits.The contact area between impregnated diamond layer and flow,and the drilling flowthrough annulus carrying away heat with conduction form can be shown by equations.Itis impossible to classify the rock drillability only by using single factor.The best met     

金刚石钻头性能及其制造工艺学

金刚石钻头质量的提高，主要取决于控制金刚石钻头的各种性能参数，特别是金刚石钻头制造工艺过程中的自动化控制，这是全面保证钻头质量的关键。经多年研究已取得了良好的效果。     

俄罗斯的金刚石及其产业发展

2010年,俄罗斯毛坯金刚石的产量约占世界总产量的25%,并以强劲的增长势头不断改变着世界金刚石市场的供应格局。对近10年发表的有关俄罗斯金刚石的英文文献进行了编译整理,对雅库特、阿尔汉格尔斯克和乌拉尔产出金刚石的宝石矿物学特征进行了比较分析,结果显示,三个产区的金刚石在颜色、形貌、微量杂质元素、发光性、包裹体等方面有一定的差异,这些差异是否可以作为俄罗斯不同金刚石产地来源的标型特征还有待进一步验证。结合俄罗斯近5年来在世界金刚石市场上的表现,简要分析了俄罗斯金刚石对国际市场的影响及金刚石产业发展的情况。有关信息对了解世界金刚石供求关系及国际金伯利进程框架下金刚石产地来源的研究有一定的参考价值。     

金刚石中的氢及其在金刚石高温高压合成中的意义

氢在金刚石中往往以一定的化学态形式存在,不同类型的金刚石中氢会以不同的电荷状态进行迁移与扩散,也可以与其他杂质元素N、B、P等作用,形成(N,H)、(B,H)、(P,H)对;为高温高压合成金刚石的物质体系中引入氢,有利于提高高温高压合成金刚石的产量、粒度及品级,也将为模拟天然金刚石的形成与探讨地球深部的动力学过程提供科学线索。     

Luminescence spectroscopy and microscopy applied to study gem materials: a case study of C centre containing diamonds

The methods of luminescence spectroscopy and microscopy are widely used for the analysis of gem materials. This paper gives an overview of the most important applications of the analysis of laser and UV excited luminescence by spectroscopy and visually by microscopy with emphasis on diamond, and specifically natural type Ib diamond, little studied so far. Luminescence based techniques are paramount to the gemmological analysis of diamond, in order to determine whether it is natural, treated or synthetic. The great sensitivity of luminescence helps detect some emitting centres that are undetectable by any other analytical method. Hence, especially for diamond, luminescence is an enabling technology, as illustrated by its pioneering use of imagery for the separation of natural and synthetic diamond, and of spectroscopy for the detection of High Pressure–High Temperature treatment. For all other gemstones the applications are at the moment less numerous, but nevertheless they remain highly important. They provide quickly information on the identification of a gem material, and its treatment. Besides the study of broad band emissions caused by various colour centres, the typical PL-causing trace elements (amongst others) are chromium, manganese, uranium and rare earth elements. In pearls the study of broad band luminescence can be useful, and particularly the study of pink to red porphyrin luminescence in pearls from certain species such as Pinctada and Pteria and others can help identify the pearl-producing mollusc, or if a pearl has been dyed or not. Type Ib diamonds are representative of the importance and complexity of the analysis of luminescence by microscopy and spectroscopy. They show a wide range of sometimes very complex emissions that result in luminescence colours from green to yellow to orange or red. These emissions show generally very inhomogeneous distribution. They are caused by a range of defects, however only a few of them are well characterized.     

Modelling the combination of birefringence retardations from strain envelopes around multiple inclusions in diamond

A paleo-alluvial 0.21 ct yellow diamond (L058) from Bingara (NSW) has three inclusions of coesite (two subequant crystals and one thin plate), each under more than 3.1 GPa internal pressure as measured by Raman spectroscopy. These inclusions cause overlapping birefringent retardation stress/strain haloes in the host diamond, visible under cross-polarised light. The complicated retardation pattern is quantified by mapping targeted retardation contours (170 nm, 270 nm and 380 nm) onto a photo of the diamond. A mathematical model of retardation is developed for each inclusion, and then the combined light retardations (CLR) are calculated using radial and tangential components with spherical and elliptical geometries. The CLR model reproduces most features of the measured data, but remaining differences may be due to local release of stress/strain by two short fractures radiating from one inclusion.