氧化砂锡矿选矿产品合理比例的探讨

个旧矿区的砂锡矿为残坡积砂矿,属难选矿石。对这类矿石的处理,近几年来革新了选矿工艺,产出含锡分别为40—45％、4％、1.5％的精矿、富中矿、贫中矿等三种产品分别送冶金处理,使选矿回收率提高5—7％。三种产品的不同比例有着不同的经济效益,因此在革新选矿工艺时,应考虑产品比例是否合理,否则选矿回收率提高了,但     

某低品位黑白钨共生矿选矿工艺研究

某低品位复杂难选黑白钨矿矿物共生关系密切,嵌布粒度细,矿石性质差异性大,获得较好的技术指标较难。分别采用"磁-浮"黑钨白钨分类浮选选矿工艺和"浮-磁-浮"白钨优先浮选选矿工艺对该矿石进行选矿研究。"磁-浮"黑钨白钨分类浮选选矿工艺可获得品位72.59%,回收率30.15%的白钨精矿和品位55.36%,回收率47.81%的黑钨精矿,钨总回收率77.96%。"浮-磁-浮"白钨优先浮选选矿工艺获得WO3品位74.57%、回收率72.90%的白钨精矿和WO3品位28.88%、回收率8.48%的黑钨精矿,钨总回收率为81.38%。     

提高车河选厂细泥锡石浮选回收率的实践

本文论述了车河选厂在适应矿石性质变化，不断提高细泥锡石选矿回收率等方面采取的一些技术改造措施和经验，介绍了通过改进脱泥工艺，采用新型组合捕收到及改善操作条件 取得的选矿效果和良好的经济效益。     

新疆某银矿矿石性质研究

通过多种测试手段,对新疆某银矿石选矿样进行了物质组成及银的赋存状态研究,论述了矿石工艺性质与选矿的关系,并提出采用提高磨矿细度的方法增加选矿回收率。     

提高某选厂黄金选矿回收率的生产实践

论述了某选厂在适应矿石性质变化，不断提高黄金选回收率等方面所采取的一些技术改造措施和经验。介绍了通过加强磨矿工艺参数的控制，改进工艺流程以及合理混合药后所取得的选矿效果和良好的选矿效益。     

永平铜矿提高老窿矿矿石选矿指标的研究及生产实践

介绍了永平铜矿老窿矿矿石工艺特性和浮选工艺特点。通过选矿试验和生产实践表明：老窿矿矿石铜硫品位高、含泥多、铜氧化率高,单独选别其回收率低,而与长期生产上的原生矿矿石混合选别则配入量不宜高于６０％ ;老窿矿矿石与原生矿矿石混合选别,不仅稳定了原矿品位,而且获得了较好选矿生产指标。     

提高康山金矿选矿回收率的实践

为解决康山金矿回收率低的问题．以选厂为试验场地进行浮选工艺正交试验，确定了最佳操作条件。通过保持稳定的操作条件和根据矿石性质变化作适当调节，使选矿回收率提高１０％以上。     

影响厂坝铅锌矿一号矿体选矿回收率的主要原因及改进措施

论述了厂坝铅锌矿厂坝一号矿体矿石的工艺类型、矿物学特征、机构构造、可磨特征。根据矿石性质的研究结果表明,铅锌的氧化率较高,矿石性质极为复杂。针对易选富矿越来越少,难选矿越来越多的实际情况,从工艺、设备、浮选技术3个方面介绍了选矿技术应用情况,分析了其特点和选矿工艺流程的不足及现有捕收剂已经不能满足浮选工艺指标的要求等进一步提高选矿回收率存在的问题,对当前应该重点攻克和注意的环节提出了建议。     

玉溪极低品位铁矿选矿工艺试验研究

根据玉溪某低品位铁矿的矿石特点,进行了直接磁选试验、永磁干式磁选机预先抛尾-磁选的工艺流程试验,这两个工艺流程均可以有效回收矿石中的铁,最终确定了矿石适宜的选矿工艺,并得到了铁品位57.12%、铁回收率50.12%铁精矿的选矿指标。     

豫西某金矿选矿工艺技术改造及应用实践

系统地阐述了豫西某金矿矿石组成、矿石类型和矿石特征等原矿基本特性,针对该金矿选矿工艺流程和生产中存在的问题,结合现场生产实际从碎矿、磨矿、粒度分级、浮选工艺、设备改造和药剂制度等方面对原选矿工艺进行改造和优化,实现了选矿厂大规模化生产,提高了金精矿品位和金总回收率,降低了选矿生产成本,为该金选厂的综合经济效益和可持续发展奠定了重要基础。     

STRATEGIES FOR PROCESSING LOW-GRADE IRON ORE MINERALS

The conventional routes for making iron and steel require that the ore be upgraded through a series of physical separation processes in sequence. The unit operations involved include crushing, grinding, separation, dewatering, pelletization, blast furnace processing, and basic oxygen furnace processing. This complex sequence is not cost effective for many low-grade ores that are resistant to physical concentration. For example, many ores contain iron oxide in a nonmagnetic form and are so fine-grained that it is uneconomical to grind them to a fine enough size to separate the iron oxides from the gangue. Exploitation of these iron minerals needs to take a different approach, using fewer process steps than are required for conventional ironmaking. Results are presented showing that it is possible to produce metallic iron directly from low-grade ores. The metal is in a form that can be easily separated to produce a high-grade iron product, and the iron recovery is greater than can be achieved from difficult-to-process ores by conventional means.     

化学选矿技术在低品位矿石处理中的应用

化学选矿技术是利用不同矿物质之间化学性质的差异,通过化学反应消融原矿石进而从原矿材料中提取所需元素的采矿手段.相较于传统的物理选矿技术,化学选矿技术在贫矿、细矿以及杂矿等分选难度较大的矿物质分离领域中具有较为显著的高效率优势.为了进一步提高化学选矿技术的应用效果,推动化学选矿技术在我国采矿产业中的应用,介绍了当前阶段化...     

某低品位银锰矿选矿工艺研究

为提高入选冶金锰的品位和保证较高的回收率，进行选矿预富集是必要的。采用集合体选矿，通过分级粗细级别分别进行强磁选，可以得到较好的选别指标。最终指标为精矿锰品位32．56％，银品位248．8g／t，锰回收率93．01％，银回收率74．65％。     

某含金铁矿石选矿试验研究

要：某含金铁矿石属于变质沉积型铁矿石,主要金属矿物为赤铁矿和磁铁矿,还含有品位为1.09×10-6的金。金矿物嵌布粒度极细且赋存在赤铁矿物中,使得金与铁很难分离。经过“（粗磨）弱磁选+（细磨）浮选+中强磁选”的联合选矿工艺试验流程,得到含金品位53.37×10-6、金选矿回收率60.47%的金精矿,得到含铁品位64.41%、铁选矿回收率75.51%、产率62.06%的铁精矿,选矿技术指标较好。磨矿细度对金矿物的回收和弱磁性铁矿物都至关重要,为了降低磨矿成本,采用阶段磨矿和阶段选别较为有利。     

Magnetic properties of low-grade hematite ore after magnetizing reduction and reoxidation using a fluidized bed

Magnetizing roasting via a fluidized bed,which was recognized as an efficient method for beneficiation of low-grade iron ores,has attracted much attention in China recently due to the fluctuation of the international iron ore market.In order to examine the effects of magnetic properties on the separability and to optimize the operating parameters,magnetic susceptibility and coercivity of a low-grade hematite after magnetizing reduction and reoxidation under different conditions were investigated.It was found that the magnetic susceptibility of roasted ore increased with reduction degree and particle diameter to different degrees.The magnetite was re-oxidized to maghemite when the temperature was below 400℃,and the magnetic susceptibility decreased slightly.The recovery efficiency decreased notably with the particle size for very fine grains although no significant change was found in magnetic susceptibility.The coercivity and remanence of roasted ores decreased with increasing roasting temperature.The scanning electron microscope(SEM) study showed that more cracks were produced by the reoxidation of reduced ores,which could possibly favor the intergranular fracturing and the liberation for further treatment.     

广西某高泥氧化铋矿选矿试验研究

广西某铋矿石中有用矿物以氧化铋为主,并伴生有褐铁矿。为了给该矿产资源的开发利用提供依据,对其进行了选矿试验研究。针对该矿石泥化严重、铁含量高的性质特征,确定采用单一浮选的工艺流程,获得了含Bi4．31％,回收率为73．13％的铋精矿。该工艺实现了矿石中铋矿物的有效回收,为氧化铋矿选矿提供了技术方向。     

基于力学分析的无底柱浅孔留矿采矿法溜矿效率优化试验

银山矿井下采场目前主要采用无底柱浅孔留矿采矿法开采北山区的薄矿体,采矿损失贫化较大。为提高井下生产效益,从静力学和流体力学的角度分析了不同的第一分层高度对存窿矿石回采率的影响,并在井下采场进行了现场试验,最终确定采场第一分层最优高度为1.8 m。采场最优第一分层高度的确定,极大地提高了溜矿效率,降低了采矿损失贫化,存窿矿石回采率最高可达82%。     

选冶联合提高甘肃某难浸金矿浮选尾矿金回收率的试验研究

甘肃某金矿矿石金质量分数为4.3×10-6,锑、砷和碳依次为0.48%、0.37%和1.84%,属于典型的复杂难处理锑金矿,现场生产采用"重选-浮选-浮尾氰化"工艺回收金和锑。由于矿石中金嵌布粒度粗细不均,锑、砷和碳等杂质含量高,导致金总回收率仅为82%,金损失严重。为提高金回收率,采用电子探针对浮选尾矿中金的赋存状态进行了研究,在此基础上开展了提高金回收率的试验研究。试验结果表明:浮选尾矿中部分金以晶格金或包裹金形式赋存于毒砂、黄铁矿和辉锑矿等硫化矿物中,氰化浸出过程中难以与浸出液接触,是导致金损失过高的主要原因;氰化浸出前先对浮选尾矿进行分级,分级后对+0.038 mm粗粒级进行再磨和活化浮选,强化对包裹金和晶格金的回收,然后再将粗粒浮选尾矿与-0.038 mm细粒级合并进行氰化浸出,金总回收率可提高约9个百分点,尾渣中金质量分数降低至0.3×10-6以下。     

青海某难浸金矿的工艺矿物学研究

青海某金矿石中含金5.2×10^-6,硫1.82%,砷1.01%,锑0.73%,铁4.19%,实验室直接氰化浸出时金回收率不足50%,属于典型的含砷锑难浸金矿。为查明影响金浸出的矿物学因素,采用X射线衍射仪（XRD）和扫描电镜（SEM-EDS）,并结合传统的光学显微镜对该难浸金矿中金的赋存状态及主要载金矿物的嵌布特征进行了研究。结果表明：该矿石中金的赋存状态主要有3种,即可见自然金（明金）、硫化矿物包裹金和脉石矿物包裹金。其中,可见自然金占比较低,仅为42.87%,主要嵌布在辉锑矿、毒砂和石英等矿物颗粒间或裂隙中;硫化矿物包裹金占比为46.83%,主要以显微、次显微金或固溶体的形式赋存于毒砂、辉锑矿和黄铁矿等硫化矿物中;脉石矿物包裹金占比为10.3%,主要以显微、次显微金或微细粒包裹体的形式赋存于石英、长石和方解石等脉石矿物中或矿物颗粒间。由此可知,自然金占比低、硫化矿物包裹金和脉石矿物包裹金含量高是造成氰化浸出时金回收率低的主要原因,工艺矿物学研究结果为该金矿的合理开发利用提供了重要参考。     

Effect of the composition of some sulphide minerals on cyanidation and use of lead nitrate and oxygen to alleviate their impact

An investigation was carried out on synthetic ores containing high purity pyrite, pyrrhotite and chalcopyrite and on two gold ores currently processed to evaluate the impact of cyanicides on cyanidation and to improve the leaching performance by using a pre-leaching, injecting oxygen and adding lead nitrate. With regard to the synthetic ores, it was found that pyrrhotite did not generate a high cyanide consumption while pyrite and chalcopyrite were detrimental. Pre-leaching was deleterious for the ore containing chalcopyrite while pre-leaching with lead nitrate was very efficient to decrease the reactivity of the ore containing pyrite. The two gold ores studied had very different compositions. The low sulphide ore had a low sulphide content (1.36% S), present as pyrrhotite while the second had a very high sulphide content (20.2% S), in the form of pyrite, pyrrhotite and chalcopyrite. The efficiency of the process conditions was peculiar to the ores. The high sulphide ore required a stronger, longer pre-leaching period (12 h) with greater amounts of lime (7.0 kg/t) and lead nitrate (600 g/t) than the low-sulphide ore. The ore with a low sulphide content required a pre-leaching of only 1 h with a small quantity of Pb(NO₃)₂ (50 g/t) and leaching can be performed at 360 ppm NaCN to allow a recovery of 96.4% Au and a low cyanide consumption at 0.18 kg/t. As for the high sulphide ore, cyanidation had to be conducted at 560 ppm NaCN to recover 88.4% Au with a cyanide consumption of 0.80 kg/t. An increase in the amount of lime enhanced oxidation of soluble sulphides. Lead nitrate stabilized copper and iron dissolution by forming a passivation layer at the surface of sulphide minerals. Lead nitrate also prevented the formation of a passive layer at the surface of gold.