一种低品位萤石矿的选矿工艺研究

本文以德化县金竹坑低品位萤石矿的矿石为例,原矿经破碎后,通过粗选磨矿细度试验确定磨矿细度,正交法确定药剂用量,经开路试验探索后,采用一次粗选、七次精选闭路浮选的小型闭路流程进行选矿试验,选别后获得的最终产品指标为:萤石精矿产率19.86%、萤石精矿品位96.27%、萤石回收率92.44%。     

萤石矿选矿工艺技术探析

一、前言萤石矿产同其他矿产一样,一般采用露天和坑下两种开采方式。本文以湖山白坛下选矿厂为例,对萤石矿选矿工艺流程及其技术指标做以探析：该选矿厂为矿山联合配套工程,选矿中是根据实际情况,确定方案的编制原则,充分利用已有设施,减少投资,降低成本;充分结合现行的生产工艺,确保技术可靠,经济合理,生产安全;充分利用资源的原则,提高选矿回收率;严格执行有关法规,因地制宜制定环保措施,做好环境保护工作。     

复杂多脉型萤石矿的选矿技术进展与展望

萤石作为一种不可再生资源,是重要的非金属矿物,是生产氟工业产品的主要原料,被广泛应用于冶金、化工、建材、轻工、光学、雕刻和国防等领域.随着萤石的应用领域不断拓宽,对萤石的需求量也不断增加,因此,萤石矿的开发和利用愈来愈受到重视.对石英型萤石、方解石型萤石、重晶石型萤石和硫化矿型萤石的选矿方法及采用的药剂制度进行了综述,同时提出采用自动控制精准加药控制药剂的组合与用量,提高药剂的选择性;采用浮选柱精选减少精选次数,简化精选流程;采用选矿与化学处理相结合的方法降低精矿中的杂质含量,提高精矿质量等是提高萤石矿资源回收效率的有效手段,指出了萤石矿选矿今后的研究方向和发展趋势.     

沙特某低品位磷矿选矿工艺研究

通过开展单一反浮选、双反浮选、反-正浮选、预先脱泥双反浮选工艺对沙特某低品位磷矿石进行选矿工艺探讨.实验结果表明,单一反浮选不能获得合格精矿;反-正浮选工艺流程较长,且药剂制度复杂;直接双反浮选工艺与预先分级双反浮选工艺均能得到w(P2O5)＞32％、w(MgO)＜0.8％的选矿指标.双反浮选工艺药剂制度简单,流程简单...     

某萤石矿工艺矿物学特征研究

萤石是现代氟化工的基础原料,为了综合利用甘肃某矿区萤石矿,采用化学分析、XRF、AMICS(矿物特征自动定量分析系统)、扫描电镜分析等方法,对该地区萤石矿的化学成分、矿物组成、矿物嵌布特征、有价组分的粒度和赋存状态以及单体解离度等进行了系统的工艺矿物学研究,结果表明:该萤石矿中有用矿物为CaF2,质量分数为5.10％;...     

高镁(钙)质胶磷矿选矿工艺及药剂研究现状

针对高镁(钙)质胶磷矿品位低、难选的特点,结合其性质,总结了适合镁(钙)质胶磷矿选矿的单一反浮选、焙烧-消化工艺技术,以及单一反浮选药剂捕收剂、抑制剂等的种类和研究应用现状,为高镁(钙)质胶磷矿的富集提供参考。     

浮选工艺参数自动监测及加药系统的研发

研究设计了浮选工艺参数自动监测及加药系统,采用电磁流量计、浓度计等测量浮选工艺参数,再通过PLC控制柜及人机界面控制加药量;该系统在新庄孜选煤厂、潘一选煤厂应用表明,可有效降低药剂用量,提高了精煤产率,取得了较好的经济效益。     

真空碳酸钾脱硫工艺的实践及优化

重钢焦化厂焦炉煤气净化采用真空碳酸钾法脱硫脱氰工艺,设计处理煤气量为12万m3/h,处理后煤气中的H2S含量低于0.2g/m3,脱除的H2S酸性气体进入制酸系统用于生产98%的浓硫酸。1工艺流程及特点     

常温浮选萤石研究

研究采用一种新型捕收剂XJD—01实现了在常温条件下的萤石浮选。浮选效果明显优于油酸加温浮选；采用粗磨浮选抛尾-粗精再磨精选-中矿单独精选的流程．获得了CaF2回收率为49．20％的二级萤石精矿和CaF2回收率为37．94％的四级萤石精矿两种精矿产品。在精选循环中还通过添加硫化钠有效地降低了精矿中的杂质含量。     

磷矿棒磨分级控制系统设计及生产实践

介绍了磷矿选矿厂棒磨分级回路自动控制系统的设计及其在生产中的应用,实践证明,该系统设计符合现代工厂控制系统要求,在该系统的作用下,棒磨机的处理能力可以达到设计值,溢流粒度可以控制在正常范围内。     

萤石、重晶石和方解石的可浮性研究

本文通过试验研究了萤石、重晶石和方解石的可浮性与捕收剂油酸用量及PH值的关系。试验发现浮选萤石、重晶石,方解石所需要的油酸用量不同,次序为：萤石＜重晶石＜方解石。萤石和重晶石在PH为中性左右时可浮性最好,而方解石在强碱性条件下可浮性最好。本文还通过矿物表面电性状态等探讨了油酸捕收萤石、重晶石和方解石的作用机理。     

人造萤石生产方法及应用进展

萤石是氟化工的重要原料,同时作为一种重要的战略资源可广泛应用于军工、石化、电子等关键领域。随着天然萤石矿资源的逐渐贫化及枯竭,亟待研究高效利用磷矿石中伴生的氟资源,以持续支持氟化工及磷化工的健康发展。简要介绍了国内外以磷肥副产氟硅酸加工氟化钙的工艺方法,同时结合各种方法的特点对磷肥副产氟硅资源的综合利用提出建议,并就氟化钙在各个行业中的应用做了简要概述。     

浮钨尾矿萤石的活化与浮选分离

针对我国某地浮钨尾矿中萤石被强烈抑制的特点,对萤石纯矿物及实际矿进行了浮选试验研究,开发出能有效恢复萤石可浮性的新型活化剂ANF-1,通过“一粗七精”的浮选流程,从含CaF224.93％的浮钨尾矿回收萤石,可获得含CaF2 95.03％的萤石精矿,CaF2回收率达62.13％.     

Study on comparison adsorption of calcium and sulfate on scheelite and fluorite surfaces

This study investigated the adsorption of calcium and gypsum on scheelite and fluorite using micro-flotation, X-ray photoelectron spectroscopy, scanning electron microscope with energy-dispersive spectrometer, and zeta potential measurements. Micro-flotation showed scheelite recovery is more sensitive to calcium, and gypsum shows stronger inhibition than calcium. Stick-shape precipitates as sulfate-bearing are only found on fluorite surface in gypsum solution. Change law of the zeta potentials of scheelite and fluorite in gypsum solution is obviously different from that in calcium solution. Therefore, we concluded that gypsum would make the separation of scheelite from fluorite more difficult than calcium.     

Impact of gypsum on flotation of scheelite and fluorite using sodium oleate as collector

ABSTRACT

In this study, effect of calcium and gypsum on scheelite and fluorite was investigated using sodium oleate as collector. Micro-flotation and contact angle results showed that the adsorption of calcium could inhibit the hydrophobicity of scheelite and fluorite. Moreover, sulfate could enhance the inhibition. FT-IR results showed that calcium could be priori precipitated into calcium oleate and adsorb on mineral surface. The adsorption of calcium could increase the scheelite potential to IEP, while it showed limited effect on fluorite potential. However, the interaction of calcium on scheelite and fluorite in gypsum solution was more complex than that in calcium solution.     

改造传统高浓度制浆工艺的生产实践

阐述了15万t/a传统高浓度制浆工艺改造用神华煤生产水煤浆所采取的工艺技术、改造内容、运行结果等。改造后连续稳定的生产实践证明,神华煤制水煤浆工艺技术是完全可行的,并为中国传统水煤浆工艺的发展提供了一个方向。     

Irradiation induced structural damage and evolution of mechanical properties in high entropy fluorite oxide

Pursuing material with excellent irradiation resistance, high chemical durability, and stable mechanical properties under extreme conditions is of great significance for developing irradiation-resistant materials. Herein, a novel irradiation-resistant high-entropy fluorite oxide (Nd_0.2Sm_0.2Gd_0.2Dy_0.2Er_0.2)₂Ce₂O₇ is reported. After 9-MeV Au ion irradiation with ion fluence of 2.7 × 10¹⁵ and 4.5 × 10¹⁵ ions/cm², the high-entropy (Nd_0.2Sm_0.2Gd_0.2Dy_0.2Er_0.2)₂Ce₂O₇ shows excellent phase stability without phase decomposition and transformation. In comparison with Nd₂Ce₂O₇, the high-entropy (Nd_0.2Sm_0.2Gd_0.2Dy_0.2Er_0.2)₂Ce₂O₇ possesses much less amorphization and lattice expansion, suggesting its improved irradiation resistance. No pronounced variation in Raman spectra can be detected in the post-irradiated structure, implying rarely structural shift arises in high-entropy (Nd_0.2Sm_0.2Gd_0.2Dy_0.2Er_0.2)₂Ce₂O₇. After irradiation, there is no irradiation-induced segregation at grain boundaries or inside the grains of high-entropy (Nd_0.2Sm_0.2Gd_0.2Dy_0.2Er_0.2)₂Ce₂O₇. The nanoindentation tests reveal that the mechanical properties of the high-entropy fluorite oxide rarely degrade. The results, along with the insight into the mechanism of heavy-ion irradiation resistance, provide insight for the subsequent research on the heavy-ion irradiation of high-entropy ceramics.