青海省大柴旦行委大里沟白云母矿地质特征与找矿标志研究

研究区位于柴北缘大陆边缘裂谷带北西部,通过对地层、构造、岩浆岩、围岩蚀变、矿石矿物成分进行研究,榴辉岩与地层走向一致,呈南北向展布。金红石型TiO 2矿与石榴子石、绿辉石矿为同体共伴生矿,均产于榴辉岩中,矿体产状与榴辉岩产状基本一致,完全受榴辉岩控制。矿床成因为变质榴辉岩型金红石、石榴子石、绿辉石矿床,找矿标志明显,具有较好的找矿远景。

新疆白云母花岗伟晶岩矿综合回收工艺研究

针对新疆青河地区复杂白云母花岗伟晶岩矿,进行云母、长石及石英综合回收工艺研究。结果表明,针对复杂白云母花岗伟晶岩矿资源特性,开发了无氟浮选分离长石-石英的浮选工艺,实现了在含铁杂质高的复杂矿浆体系中石英矿物的高效捕收,解决了传统有氟浮选工艺造成环境污染的难题。以Y_(8)作捕收剂直接浮选云母矿物,浮选尾矿采用阳离子捕收剂Y_(8)和阴离子捕收剂RCH_(2)^(#)混合捕收剂无氟浮选分离长石-石英矿物。在原矿含3.76%Na_(2)O、4.46%K_(2)O、13.91%Al_(2)O_(3)、74.84%SiO_(2)的情况下,获得K_(2)O品位为1.78%、K_(2)O回收率为4.48%的云母精矿,Al_(2)O_(3)品位为19.11%、Al_(2)O_(3)回收率为77.48%的长石精矿(K_(2)O与Na_(2)O分别为4.72%、7.43%),以及SiO_(2)品位为99.31%、回收率为42.97%的云母精矿,实现了新疆复杂白云母花岗伟晶岩矿产资源的高效综合回收。

琼西南红五地区结晶基底褶皱变形分析及其找矿地质意义

红五地区抱板群经历了漫长的多期变形作用过程，总体呈现出由深层次→中浅层次的构造变形景观，属一套总体有序、局部无序的构造岩层。变形相分析表明赋存于该构造岩层中的晶质石墨矿和伟晶岩型白云母矿形成于固态流变阶段，认为在亚南甫背斜的东、西两侧分别存在新的隐伏晶质石墨矿和伟晶岩型白云母矿。

Potassium recovery from muscovite using NaCl-roasting followed by H_(2)SO_(4)-leaching

The present study aims at the recovery of potassium from muscovite mica(which contains K_(2)O;~10 wt%)using NaCl-roasting coupled with H_(2)SO_(4)-leaching process.The preliminary acid leaching studies applying different mineral acids resulted in a potassium recovery of 8%−18%.The optimum leaching conditions for the maximum recovery were 4 mol/L H_(2)SO_(4),60 min leaching time and liquid-solid ratio 4 mL/g at 90℃.However,the roasting of muscovite with additive NaCl(muscovite:NaCl mass ratio of 1:1.00,900℃,45 min)followed by H_(2)SO_(4)-leaching(95℃,60 min)extracted potassium to the tune of 98%.Under similar roasting conditions,the H_(2)O-leaching process extracted only 60%of potassium.The effects of various roasting and leaching parameters such as temperature,time,NaCl concentration,acid concentration,liquid-solid ratio on potassium extraction were evaluated.The appearance of the sylvite(KCl)mineral phase in the NaCl-roasted muscovite and its disappearance in the acid/water leached residue confirmed the physical and chemical distortions of the muscovite crystal structure.The possible mechanism of potassium release from the complex muscovite structure was elucidated based on available literature substantiated by characterizations using X-ray diffraction(XRD)and scanning electron microscopy with energy dispersive X-rays spectroscopy(SEM-EDX).

Muscovite 40Ar-39Ar age and its geological significance in Zhuxi W（Cu） deposit, northeastern Jiangxi

The Zhuxi W(Cu)skarn deposit,the world’s largest tungsten deposit is newly discovered in Jingdezhen city,northeastern Jiangxi province,China.It mainly occurs near the contact zone between the Yanshanian granites and the Late Paleozoic carbonate rocks.Three types of mineralization including skarn type,altered granite type and quartz vein veinlet type orebodies have been observed.In this study,the 40Ar 39Ar age of hydrothermal muscovite coexisting with copper mineralization in the altered granite type orebody formed near the unconformity interface is determined by step-heating technology using CO2 laser.The plateau age,isochron age,and inverse isochron age of muscovite are(147.39±0.94)Ma,(147.2±1.5)Ma,and(147.1±1.5)Ma,respectively.These ages are almost identical to the ages of ore-related granite and other mineralization types in the Zhuxi W(Cu)deposit,indicating that the Cu mineralizations occurred at the shallow depth and near the unconformity interface are contemporaneous during the Late Jurassic.This further suggested that the acompanied W and Cu mineralization in the Zhuxi W(Cu)deposit which may be controlled by the magma source is enriched in both W and Cu.

Comprehensive utilization of kaolin ore accompanying muscovite

In light of the problems of low-quality and low degree of comprehensive utilization of Guangdong muscovite-type kaolin, the reasons affecting the quality of kaolin were found to be a small amount of maroon powdery goethite adhering to the surface of kaolin and minor muscovite affecting the firing whiteness of products. The ores were dealt with by using the new combined process of attritioning-classifieation-bleaching and flotation. The separation of kaolin from muscovite, quartz and feldspar can come true through the new process. The high-quality kaolin with the firing whiteness of 91% can be obtained, and the muscovite is comprehensively recovered by adopting the key technology of flotation. The content of high-purity muscovite produced is over 99%. The muscovite discarded by original process can be comprehensively recovered.

Mineralogical feature and geological significance of muscovites from the Longyuanba Indosinian and Yanshannian two-mica granites in the eastern Nanling Range

Emplacement P-T condition estimations using granites are important for understanding metamorphic and erosional processes of orogenic belt.Granites are widespread in South China and a majority of them are peraluminous.Particularly,over 91%of the Indosinian granites exposed in the region are peraluminous in composition.It is extremely hard to determine the pressure of intrusion of these peraluminous granites due to the absence of amphibole,a good mineral barometer commonly identified in metaluminous granites.Muscovite is a common mineral in peraluminous granites,certain kind of it could be used as a mineral barometer to constrain the emplacement pressure of peraluminous granites.In this paper,results of petrographic and geochemical studies of muscovites from the Indosinian and early Yanshanian two-mica granites at the Longyuanba in the eastern Nanling Range are reported.Based on petrographic studies,the primary muscovite can be discriminated from the secondary muscovites.Muscovites from the Indosinian two-mica granites are enriched in Ti,Al,Mg,and Na,and depleted in Fe and Mn.Geochemically,these muscovites were considered as primary,whereas those from the Yanshanian two-mica granites fall into the area of secondary muscovite on discrimination diagrams.Barometer estimations show that pressures calculated for primary muscovites are accurate,but those calculated for secondary muscovites are overestimated.The average pressure of emplacement of the Longyuanba Indosinian two-mica granites is 5.9 kbar,corresponding to^19 km in depth,suggesting that the Indosinian granitic magmas were probably generated by partial melting of a thickened crust root in a compressional tectonic setting.