| As one of the strategic mineral material,high-purity quartze has been widely used in integrated circuista,semiconductor chips,solar energy and other high-tech industries.However,raw material deposits that can be used to produce high-purity quartze are extremely scares,especially in China.Vein quartz is one of the raw materials for the production of high purity quartz,and Hubei Province is an important distribution area for vein quartz in China.The quartz mining area in the Fujiashan,Tongshan County,Hubei Province,is located within the Makufu Mountain metallogenic belt in southeastern Hubei Province,and little research has been carried out on the vein quartz deposits in this area.In the past,geological work such as basic geological mapping and low level mineral censuses were mainly carried out,and there was a lack of research on the use of vein quartz as a raw material for high purity quartz and the characteristics of impurity elements in the region,and the genesis of vein quartz deposits was rarely explored.This paper therefore takes the vein quartz deposits within the mine area as the object of study,identifies the characteristics of the ore-controlling structures,mineral assemblages and alteration of the surrounding rocks in the region,uses a combination of optical microscopy,scanning electron microscopy and inductively coupled plasma emission spectrometry analysis to study the quartz samples from the Fujiashan,Pengjiadong and Luanjian quartz deposits within the mine area,combines them with conventional beneficiation processes,and commercially evaluates their potential as the potential of the deposits as a source of high purity quartz（HPQ）in conjunction with conventional beneficiation processes was assessed,and the source of the ore-forming material,the ore-forming environment,the impurity element characteristics and the geogenesis of the deposits as a raw HPQ deposit were profiled.1.The Fujiashan ore body is hosted in a north-east oriented fracture structure of the Neoproterozoic Sun Mountain rock body（north slope of the Jiu Gong Shan rock body）;the Pengjiadong and Luanjian ore bodies are produced in a mixed rock and slate contact zone,and the ore body is hosted in a north-east-west-east oriented fracture fragment,the ore body is vein-like output,the structure of the ore is fine-grained authomorphic and semi-authomorphic granular structure,the ore structure is blocky,the type of magmatic hydrothermal genesis,the industrial type of the ore is high silicon and low iron-aluminium type vein quartz.2.Microscopic observations show that the main mineral impurities associated with quartz are potassium feldspar,muscovite,iron oxide,rutile and paragallite;quartz crystals contain a large number of fluid inclusions<5μm,mainly in the liquid phase,followed by gas-liquid two-phase inclusions,which can be divided into primary and secondary inclusions.3.The original quartz from the Fujiashan mine is of good quality,with the ore containing>99.9%Si O2 and the impurity elements mainly being Al,K,Fe,Li,Na,Ti and Ca;the Pengjiadong ore body has the lowest total impurity content,followed by chaotic-tip vein quartz and the most quartz from the Fujiashan range,at 88.87,154.12and 497μg/g respectively.4.After the conventional purification process of high temperature,water quenching and hot acid pickling of the original ore from the Fujiashan mine,the removal of various impurities was good,especially Fe,Ca,B,S and P impurity elements;the Pengjiadong ore body had the lowest impurity content,followed by Luanjian vein quartz,and the Fujiashan quartz had the most,at 41.43,65.13 and 201.57μg/g respectively.5.Based on the impurity content in quartz and the size of the ore body as well as the HPQ criteria,the Pengjiadong vein quartz ore body is a high purity quartz raw material deposit;the total impurity element content of the Luanjian vein quartz ore body is slightly higher than the HPQ criteria,but its close proximity to Pengjiadong and its similarity in geogenesis,it is also a high purity quartz raw material deposit;the total impurity element content of the Fujiashan quartz ore body is much higher than the HPQ criteria,caused by the prevalence of potassium feldspar,which will be lower after flotation and high temperature hot chlorination,and the deposit can be considered potentially economically valuable.6.The low trace element content of vein quartz in the Fujiashan ore body may be due to metamorphism,while Pengjiadong and Luanjian may have been more strongly metamorphosed and contact accounted for at a later stage,resulting in a lower content of elements such as Al,K and Li than the Fujiashan ore body.7.Based on the comprehensive analysis of the surrounding rocks,deposit characteristics,mineral composition and impurity elements of the Fujiashan mine,the deposit is of magmatic hydrothermal origin,and the controlling structure is a regional fracture structure or within a fracture zone of surrounding rocks and metamorphic slate;the mineralisation temperatures of the quartz ore bodies in Fujiashan,Pengjiadong and Luanjian Vein are calculated to be 464°C,455°C and 465°C respectively based on the Ti content in quartz using a Titani Q thermometer,which are high temperature hydrothermal deposits. |
