Luoyang Glass Factory Fangshan sandstone mine is a tightly cemented sandstone, currently mining an average _{grade: SiO 2 98.29%, Al 2} O 3 0.59%, Fe 2 O 3 0.11%. When the mine was first put into production, it used bottle kiln calcination, coarse crushing of jaw crusher , crushing of impact crusher, and multi-stage processing of cage grinding. In 1980, it built a dry self-grinding production line. In 1989, another three were built. Self-grinding production line, the process flow is shown in the figure below. The self-grinding machine has a specification of φ4mm×1.4m, and the average production capacity of a single machine is 10～12.47t/h. The product has a particle size composition of 0.9 to 0.076 mm and a chemical composition of SiO ₂ 99.10%, Al ₂ O ₃ 0.43%, and Fe ₂ O ₃ 0.14% to 0.18%. In addition, an ultrafine powder of less than 0.076 mm with a productivity of more than 25% cannot be used as a glass raw material.

In order to solve the problem of dry self-grinding dust pollution and high ultra-fine powder content, the mine is currently undergoing wet bar grinding and beneficiation process modification of the production line, and the process flow is similar to that of Leizhuang sandstone mine. The results of semi-industrial tests show that the 20~0mm ore, after rod grinding, sieving, deliming, magnetic separation, classification, dehydration and other processes, produces quartz sand containing Fe ₂ O ₃ less than 0.07%, 0.63~0.10mm The yield was 97% and the concentrate yield was 73.2%.

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