Group 1 - The company, Huicheng Environmental Protection (300779.SZ), has been deeply engaged in the environmental protection sector for many years, focusing on "original technology innovation and resource recovery from waste" [2] - The core technologies independently developed by the company include waste catalyst resource utilization technology, high-sulfur petroleum coke hydrogen production ash comprehensive utilization technology, industrial flue gas non-ammonia reduction desulfurization technology, industrial waste sulfuric acid chemical chain recycling technology, saline (sodium sulfate) wastewater reuse technology, and mixed waste plastic deep catalytic cracking technology (CPDCC) [2] - Currently, the company's business scope does not involve gold recovery [2]