Jiangsu Xinhua Semiconductor Technology Co., Ltd. is working hard to break the shackles of synthetic quartz industrialization
Recently, the State Intellectual Property Office announced two patents on synthetic quartz sand from Jiangsu Xinhua Semiconductor Technology Co., Ltd. Interestingly, this company applied for and announced "
a method for preparing high-purity synthetic quartz sand" and "a method for preparing low-cost high-purity synthetic quartz sand". From the patent names, it can be seen that the difference is that the synthesis cost of the latter is lower than that of the former.
In the existing quartz sand synthesis technology, high-purity quartz is usually produced by synthesis through sol-gel method, chemical vapor deposition or gas phase synthesis . However, synthetic quartz obtained by chemical vapor deposition or gas phase synthesis usually contains a large amount of hydroxyl groups, which affects the final strength of quartz ; and synthetic quartz prepared by the sol-gel method in the prior art usually contains a large amount of bubbles or metal impurities .
The purpose of the invention of "A method for preparing high-purity synthetic quartz sand" by Jiangsu Xinhua Semiconductor Technology Co., Ltd. is to provide a method for preparing high-purity synthetic quartz sand, using polysiloxane as a silicon source and a two-step hydrolysis method to improve the stability of the solution, while controlling the gelation rate to ensure that the gel has a uniform structure and composition during the formation process, and to age the gel and shrink the gel to rearrange the gel structure, expel gaps and bubbles, and make the crystal structure of the quartz sand more uniform, thereby helping to improve the strength of the quartz sand.
The technical scheme of "A method for preparing high-purity synthetic quartz sand" of Jiangsu Xinhua Semiconductor Technology Co., Ltd. is as follows: hydrolysis, in an inert gas atmosphere, with hydrochloric acid as an acidic catalyst, alcohol and high-purity water as solvents, under heating conditions, polysiloxane is hydrolyzed; preparation of sol, under heating conditions, high-purity water is added to the hydrolysis system to form a sol; preparation of gel, adding an alkaline catalyst to the sol, letting it stand to obtain a gel; gel aging, under heating conditions, adding a silicon source and alcohol to the gel to age the gel; preparation of synthetic quartz sand, drying, crushing, and calcining the aged gel to obtain the synthetic quartz sand.
