Abstract: In order to realize the high value and resource comprehensive utilization of a limestone mine in Shaanxi Province，in view of the high content of SiO2，which limits the application of high added val⁃ ue，based on the study of the basic properties of the chemical composition，mineral composition and dissem⁃ ination characteristics of the limestone mine，the screening classification and photoelectric beneficiation synergistic treatment process are carried out.The test results show that the high-quality limestone products with yield of 9.07%，CaO content of 54.17%，SiO2 content of 1.62% and yield of 45.49%，CaO content of 53.50%，SiO2 content of 2.64% are obtained by grading-photoelectric separation process，as well as lime⁃ stone products used in metallurgy，desulfurization，feed，building materials and other ways. The high-value and diversified comprehensive utilization of the limestone mine is realized，which provides a low-cost and easy-to-implement technical scheme for the green and efficient development of high-silicon limestone.

Key words: high silicon limestone, classification, photoelectric separation, comprehensive utilization