蓝晶石及其选矿现状

简述了蓝晶石族矿物的性质、用途、矿床类型、质量要求等，并对蓝晶石矿物的浮选、重选、磁选方法作了介绍。     

甘肃某低品位蓝晶石矿物选矿试验研究

甘肃某蓝晶石矿物的主要脉石矿物为石英、云母、石榴子石等,具有品位低、脉石矿物种类多的特点,属于难选矿石。实验表明:采用碱法工艺经过3次反浮选、1次粗选、3次精选、1次磁选的选矿流程,可获得产率为22.13%,Al2O3品位为55.32%,回收率为63.21%的蓝晶石精矿。此流程为该蓝晶石资源的开发和利用提供了理论指导。     

非洲氧化铜矿浮选-磁选联合选矿工艺

非洲某氧化铜矿氧化程度高,矿石品位较好,湿法处理耗酸量大。本文以浮选-磁选联合选别工艺进行研究,经"一粗三扫一精"浮选得到了精矿品位25.89%,精矿直收率56.25%,浮选中矿及尾矿经高梯度磁选,得到含铜14.57%的精矿,联合选别综合回收率达到95.68%。     

某低品位矾矿选矿试验研究

浙江某低品位矾矿矿石性质复杂,嵌布粒度细,采用一次粗选三次精选两次扫选中矿依次返回的碱法浮选流程进行浮选试验,再将浮选得到的明矾石精矿经高梯度强磁选除铁,最终获得的明矾石精矿含Fe2O31.71％,SO3品位28.78％,SO3回收率82.23％.产品质量超过了明矾石特级品要求.     

硅线石选矿工艺研究及生产实践

硅线石用途广泛,也是高级耐火材料的重要原料。在综合分析国内外硅线石选矿的特点之后,针对河北灵寿硅线石制定了弱磁—浮选—强磁的流程。在碱性介质中直接浮选硅线石,打破了国外要预先脱泥的惯例。文章介绍了小试、扩试、工业试验生产的情况,试生产获得硅线石精矿含Al_2O_3品位55.52％,收率58.49％。对1.5万t/a的选矿厂初估年盈利近400万元。     

某复杂低品位硫铁矿选矿工艺研究

某复杂低品位硫铁矿矿石性质复杂,结构构造多样,硫、铁矿物主要赋存在黄铁矿、磁铁矿和磁黄铁矿中,分选难度较大,为合理开发该矿产资源,本文对其进行了选矿工艺研究。结果表明,采用"优先浮硫—尾矿磁选收铁"工艺,在原矿含硫13.62%、含铁21.52%的基础上,闭路试验可获得含硫41.35%、硫回收率83.37%的硫精矿,含铁64.86%、铁回收率76.35%的铁精矿,试验指标良好,硫、铁矿物得到了较好的综合回收。     

硫铁矿及矿灰渣的选矿方法简介

近些年来,国内硫铁矿制酸领域在利用硫铁矿的烧渣选矿或将硫铁矿原料选成精矿后再焙烧的技术方面有所发展.一些新建或扩建的硫铁矿制酸装置,虽然彼此规模相差不大,采用的技术亦基本相同,但其中有的效益较好,有的却较差.笔者认为形成这种差距的原因之一在于原料硫铁矿的选择和处理,现将所了解到的广东在这方面的情况作一简介.     

高硫磁铁矿石的选矿

武安高硫磁铁矿石用常规药剂，在弱碱性介质中浮选，浮选尾矿经弱磁选．可以获得硫精矿和铁精矿。硫精矿品位42．14％，回收率95．18％；铁精矿品位66．48％，回收率78．43％，含硫0．26％。符合冶炼对产品质量的要求。     

中性条件下蓝晶石矿物的浮选行为研究

通过单矿物浮选实验、动电位、吸附量及红外光谱测试分析,考察了蓝晶石、石英、黑云母的浮选行为以及矿物与药剂的作用机理。浮选实验结果表明,在中性条件下,单独用十二胺盐酸盐(DAC)作捕收剂,3者可浮性差异不大,不能有效分离,必须添加抑制剂。3种抑制剂在相同的质量浓度下,对蓝晶石矿物的抑制强弱顺序为:淀粉水玻璃氟化钠。金属阳离子的添加对3种矿物的浮选影响也不同,对蓝晶石及石英的抑制强弱顺序为:Al 3+Fe3+Mg2+Ca2+,对黑云母的抑制顺序为Ca2+Mg2+Al 3+Fe3+,黑云母总体趋势变化不明显。动电位、吸附量及红外光谱分析表明,淀粉在蓝晶石表面的吸附为物理吸附,并且主要通过氢键作用来实现,这样淀粉对蓝晶石具有更强的抑制能力,能有效地实现蓝晶石矿物的反浮选分离。     

腾冲高泥氧化锌矿选矿实验研究

针对腾冲某氧化锌矿嵌布粒度细、含泥量高的技术难题进行了选矿实验研究. 结果表明,该矿中锌品位为6.65%、铁品位为12.31%,锌氧化率达92.83%,锌主要以异极矿形式存在,铁主要以磁铁矿形式存在. 经多个实验流程对比分析,采用预先洗矿(洗去小于37 mm粒级的颗粒)、沉砂磨矿后先磁选后浮选的流程,确定最佳磨矿细度为小于75 mm的颗粒达91.74%,弱磁选电流为4 A,粗选药剂用量为碳酸钠2 kg/t、六偏磷酸钠2 kg/t、硫化钠13 kg/t、KPR 2 kg/t. 采用闭路选矿流程,得到锌品位为27.89%、回收率75.26%的氧化锌精矿和铁品位为61.25%、回收率51.65%的铁精矿. 通过Zeta电位分析捕收剂KPR与异极矿的作用机理.     

云浮硫铁矿烧渣选矿试验

对云浮硫铁矿烧渣磨矿－弱磁选－阴离子反浮选试验流程、设备、工艺条件和试验结果作了介绍。在磨矿细度－２００目８８．４８％、原烧渣含铁品位４５．８７％的条件下，经磁－浮流程分选，获得综合铁精矿品位５５．４４％，回收率７７．９１％的指标。综合的尾矿品位含铁２８．５０％．     

含铜磁黄铁矿的选矿研究

在对江西某含铜磁黄铁矿的选矿研究中采用了全浮和磁－浮两种工艺。全浮工艺获得硫精矿品位３５．５６％，收率９０．０８％，铜精矿品位１７．８５％、收率７２．８４％。磁－浮联合工艺获得硫精矿品位３４．２％、收率９４．５％，铜精矿品位１８．９８％、收率５６．１０％。全浮用药量较磁一浮工艺高，但耗水量小。全浮工艺的铜回收率较高。两种工艺均能获得较好的选矿指标。     

BUBBLE AND FOAM SEPARATION OF EMULSIFIED BITUMEN FROM TAR SAND WASTEWATER

Process waters generated by the steam purging of tar sand deposits in Vernal, Utah, were treated by means of second-stage foam separation and air flotation operations. Among the independent process variables considered were hydraulic detention time, air flowrate. temperature, and polymer or surfactant addition level. System performance evaluations were based on second-stage effluent levels of total organic carbon (TOC), chemical oxygen demand (COD), suspended solids (SS). total solids (TS), and turbidity. The results indicated that the most effective second-stage system studied was air flotation aided by polymer addition. Removals of TOC, COD, and SS accomplished by this system exceeded 98 percent.     

难选低品位铜硫矿石选矿试验

灵山多金属硫化矿是氧化程度较高的矿石，且伴生有易浮的闪锌矿。采用铜硫部分混合浮选，以及联合使用H2SO3、ZnSO4、Na2S作闪锌矿的抑制剂，较好地解决了铜锌浮选分离问题，获得了合格的铜精矿和硫精矿。     

锦屏磷矿陶湾矿区开发初探

1 矿区概况 锦屏磷矿是1958年建成投产的磷矿采选联合企业,原设计规模为年产原矿石112万t,磷精矿粉30万t.设计总开采深度为-350 m,矿山服务年限为16年.     

Kyanite compounds for guncreting the linings of steel ladles

Conclusions A study was made of the properties of guncrete compounds based on kyanite suitable for service in steel ladles. The best properties were possessed by a compound containing 80% kyanite, 10% clay, and 10% binder.Industrial trials with the guncrete compounds were completed. The life of the new compounds is 20% longer than that of similar compounds based on Novoselitsk kaolin.Translated from Ogneupory, No. 8, pp. 25–29, August, 1981.     

瓮福磷矿a层矿和b层矿的混合选矿实践

瓮福磷矿a层矿为沉积型硅钙质磷块岩,b层矿为典型的沉积型钙(镁)质磷块岩,前者选矿工艺复杂、选矿成本高、回收率低,后者已连续生产12年.为了更好地开发利用a层矿,本研究对a、b混合矿进行了选矿小实验和工业试验.工业试验结果表明:利用现有的一次反浮选选矿工艺和药剂制度进行(a b)混合选矿是可行的,而且药剂用量比单独选别b层矿时的药剂耗量少,回收率高,混合精矿达部标优质Ⅱ类产品要求.     

城市袋装垃圾处理系统的研究

论述城市袋装垃圾处理干燥焚烧前的处理工艺和设备.特别是将破袋、风选、磁选放在同一系统设备中,采取机械化的操作,结构紧凑、结构简单、节能,从我国国情出发,利用现有技术设备进行升级改造,投资少见效快,对垃圾处理设备设计、改造具有实际应用价值,是解决现实城市垃圾处理的有效途径.     

Review of the research on oxides in low-temperature magnetic refrigeration

The discovery of the giant room temperature magnetocaloric effect (MCE) has renewed a remarkable research interest in the field of magnetocaloric materials at low temperatures. Among the various magnetocaloric refrigerants, rare-earth transition-metal oxides are one of the most promising candidates for low-temperature applications. In this study, the magnetic properties of rare-earth transition-metal oxides and their research status are reviewed. Three different systems are introduced in the review: (1) Manganates including RMnO₃, RMn₂O₅ and R₂Mn₂O₇ series; (2) Chromates including RCrO₃ and RCrO₄ series; (3) Vanadates including RVO₃ and RVO₄ series. The strong correlation of magnetocaloric effect of materials with crystal structure and magnetic phase transition is summarized. The origin of large MCE and potential applications of these materials are discussed. The purpose of the review is to provide a new idea for the selection, search and design of magnetic materials with enhanced MCE, and to promote the development of low-temperature magnetic refrigeration technology.     

Mechanical Activation of the Decomposition and Sintering of Kyanite

The influence of attrition milling on the thermal decomposition of kyanite (Al₂O₃·SiO₂) to mullite (3Al₂O₃·2SiO₂) and SiO₂, and its subsequent sintering, was studied. A commercial kyanite was attrition-milled for times up to 12 h. Dilatometry confirmed that as-received unmilled kyanite decomposes between 1300° and 1435°C. The decomposition reaction is slow initially and accelerates during the later stages until about one-half of the decomposition occurs in the last 35°C. For the attrition-milled kyanite, the onset decomposition temperature decreases, the transformation temperature interval is reduced, and both the decomposition reaction and subsequent sintering are accelerated. A dense microstructure of fine equiaxed mullite grains in the 1 μm size range, evenly dispersed in a glassy matrix, is obtained by sintering the attrition-milled kyanites. These results are explained in terms of the energy accumulated during attrition milling, a reduction of the milled kyanite particle size, and the presence of a liquid phase during sintering.