Crystal Chemical Characteristics Of Vein Quartz And Its' Relationship Of Making High Purity Quartz

High purity quartz is the main raw material for the production of high performance materials such as monocrystalline silicons,polycrystalline silicons,quartz glasses,optical fibers,solar cells,integrated circuit substrates and so on.It is also regarded as an important component in photovoltaic industry and semiconductor manufacturing chains.High purity quartz is generally prepared through the processes of concentration,purification and processing,which the initial raw materials are the one or secondary natural crystal.However,the world's crystal resources are scarce and their distribution is uneven,which makes it particularly important for the searching for other quartz mineral alternatives.In many quartz minerals,vein quartz is the ideal raw material for the processing of high purity quartz because of its high SiO2 content more than 99%,its high purity and less impurity content.However,not all of the veins can be purified to high purity quartz with high purity.Due to the different geologic conditions of the veins in various places of origin,the chemical composition,crystal structure and purification process of the veins are diverse.Therefore,how to identify high-quality vein quartz has become a very important research direction.In this paper,the same kind of purification method was used to purify the vein quartzs selected from 18 different places of origin.The purified samples were charactered by ICP detection,infrared absorption spectroscopy,X-ray diffraction analysis.Meanwhile,we explored the relationship between the chemical characteristics and the purification effects of of the veins Pure quartz.The main experimental results are as follows:(1)According to the results of ICP detection of impurity content after vein quartz purification,18 ores can be divided into upper,middle and lower three: upper vein quartz,SiO2 content> 99.995%;medium pulsed quartz,SiO2 content of 99.99% ~ 99.995 %;Lower vein quartz,SiO2 content <99.99%.(2)After purification processing,the average moles of Li + Na + K and Al + B + Fe in the upper veins were 0.3558 mol and 0.5528 mol,respectively,and the former was 0.197 mol smaller than the latter.Li + Na + K and Al The average molar moles of Li + Na + K and Al + B + Fe were 3.0517 mol and 2.5535 mol,respectively,and the average molar amount of Li + Na + K and Al + B + Fe were 3.0717 mol and 0.8015 mol respectively,The former than the latter 0.4982 mol.(3)When the content of aluminum in the suspended quartz exceeds 40 × 10-6,the position of the infrared absorption vibration absorption peak moves 0.5 ~ 1.5 cm-1 in the direction of low wave number.This is mainly due to the quartz into the lattice of aluminum ions in the quartz lattice caused by the increase in the volume.With the increase of the content of aluminum,iron and titanium in the crushed quartz,the infrared absorption peak of the infrared characteristic moves to the low wave number.(4)The change of aluminum ion content in the samples was 7.89×10-6~173.75×10-6.With the increase of aluminum content in the samples,the volume of quartz cells increased from 112.92 ?3 to 113.12 ?3.When the aluminum content exceeds 30 × 10-6,the lattice constant c0 increases from 5.405? to 5.407? with the increase of aluminum content,and the increase of alkali metal ions in the sample does not increase the lattice constant a0.