高纯石英的概念及其原料品级划分

Concept of High Purity Quartz and Classification of Its Raw Materials

高纯石英是SiO_(2)纯度大于99.9%的石英砂系列产品的总称,其本质是以天然石英矿为原料经提纯加工获得的具有极高SiO_(2)纯度且具有一定粒度组成的石英晶体原材料,其概念应同时具备纯度、粒度和矿物相三个特征;根据我国高纯石英生产及应用情况,进一步完善了产品等级划分,按SiO_(2)纯度将高纯石英产品分为高端(4N8)、中高端(4N5)、中端(4N)和低端(3N)4个等级;目前能够用作高纯石英原料的石英矿床工业类型有天然水晶、脉石英和花岗伟晶岩石英3种,其中脉石英是我国目前高纯石英生产的主要原料;根据天然水晶和脉石英样品的提纯加工试验结果,将高纯石英原料划分为与高纯石英系列产品等级相对应的4个品级,它们分别是用于高纯石英高端、中高端、中端和低端产品生产的A级矿(优质矿或优质原料)、B级矿(上等矿或上等原料)、C级矿(中等矿或中等原料)和D级矿(下等矿或下等原料)。发现能够稳定满足工业生产需要的优质原料,实现4N8高纯石英高端产品的国产化问题,这是我们应当努力的方向。

High purity quartz is a general term for quartz series products with SiO_(2)contents greater than 99.9%.Its essence is a quartz crystal raw material with extremely high SiO_(2)purity and certain particle size obtained from natural quartz ore by purification and processing.The concept of high purity quartz should have the characteristics of purity,particle size and mineral phase at the same time.According to the production and application of high purity quartz in China,the product grade classification is further improved,and high purity quartz products are divided into four product grades:high grade(4N8),intermediary grade(4N5),medium grade(4N)and low grade(3N).At present,natural quartz crystals,vein quartz and granite pegmatite quartz can be used as raw materials for high purity quartz products.Among them,vein quartz is the primary raw material for the production of high purity quartz in China.Based on the purification effect of natural quartz crystals and vein quartz,the raw material of high purity quartz can be divided into four grades corresponding to the grades of high purity quartz series products.They are class-A ore(high quality ore or high quality raw material),class-B ore(secondary ore or secondary raw material),class-C ore(medium ore or medium raw material)and class-D ore(inferior ore or inferior raw material)for the production of high purity quartz products from high-grade to lowgrade,respectively.It is the direction we should strive to find high quality raw materials that can stably meet the demands of industrial production and solve the localization of 4N8 high grade high purity quartz.